🎉 Initial commit
This commit is contained in:
Jonas Bengtsson
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# Python bytecode / build
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__pycache__/
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*.py[cod]
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*.egg-info/
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build/
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dist/
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# Virtual environments
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.venv/
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# Test / tool caches
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.pytest_cache/
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# Local runtime artifacts (copy config.example.yaml -> config.yaml)
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config.yaml
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logs/
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Vendored
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{
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// Debug configurations for the OPC DA Diagnozer CLI.
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// All configs run `python -m opcda_diagnozer` with the 32-bit venv
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// interpreter — the bitness that matches the 32-bit OPC DA wrapper DLLs
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// (SPECIFICATION §11). Pick one from the Run and Debug view (Ctrl+Shift+D).
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//
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// NOTE: `run` / `probe` are Phase 1 stubs until the core engine lands
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// (docs/IMPLEMENTATION_PLAN.md §4) — the configs are ready for that day.
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"version": "0.2.0",
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"configurations": [
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{
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// Basic use: foreground monitoring run (the normal way to run the tool).
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// Currently prints the Phase 1 stub message; becomes live with the
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// core engine. Set breakpoints in main.py / monitor/ to debug it.
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"name": "opcda-diagnozer: run (foreground)",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": ["run", "--config", "config.example.yaml"],
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"cwd": "${workspaceFolder}",
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"console": "integratedTerminal",
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"justMyCode": false,
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"env": {
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"PYTHONUNBUFFERED": "1"
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}
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},
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{
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// Basic use: validate the example config without connecting.
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"name": "opcda-diagnozer: check-config",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": ["check-config", "--config", "config.example.yaml"],
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"cwd": "${workspaceFolder}",
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"console": "integratedTerminal",
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"justMyCode": false,
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"env": {
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"PYTHONUNBUFFERED": "1"
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}
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},
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{
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// Show all available OPC DA servers (auto: Automation Wrapper over
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// COM, falls back to the local registry scan).
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"name": "opcda-diagnozer: list-servers",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": ["list-servers"],
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"cwd": "${workspaceFolder}",
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"console": "integratedTerminal",
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"justMyCode": false,
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"env": {
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"PYTHONUNBUFFERED": "1"
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}
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},
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{
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// Show all available OPC DA servers via the no-COM registry scan,
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// with full metadata (CLSID, description, DA versions) as JSON.
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"name": "opcda-diagnozer: list-servers (registry, JSON)",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": ["list-servers", "--source", "registry", "--json"],
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"cwd": "${workspaceFolder}",
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"console": "integratedTerminal",
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"justMyCode": false,
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"env": {
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"PYTHONUNBUFFERED": "1"
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}
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},
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{
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// Show OPC DA servers on a remote DCOM host — prompts for the host
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// name at launch. Needs Launch+Activation permissions for your user
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// on the target host (README "DCOM troubleshooting").
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"name": "opcda-diagnozer: list-servers (remote host…)",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": ["list-servers", "--host", "${input:dcomHost}"],
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"cwd": "${workspaceFolder}",
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"console": "integratedTerminal",
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||||||
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"justMyCode": false,
|
||||||
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"env": {
|
||||||
|
"PYTHONUNBUFFERED": "1"
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||||||
|
}
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|
},
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{
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// List the devices (address-space branches) of the configured
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// server — one level, with per-device tag counts.
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"name": "opcda-diagnozer: list-devices",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": ["list-devices", "--config", "config.example.yaml"],
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"cwd": "${workspaceFolder}",
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"console": "integratedTerminal",
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"justMyCode": false,
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|
"env": {
|
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|
"PYTHONUNBUFFERED": "1"
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|
}
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},
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{
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// List the tags of one device (whole subtree) as JSON — the
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// item_id values are what go into config `tags:`. Adjust the
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// device path to the server your config points at.
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"name": "opcda-diagnozer: list-tags (recursive, JSON)",
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"type": "debugpy",
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"request": "launch",
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"python": "${workspaceFolder}/.venv/Scripts/python.exe",
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"module": "opcda_diagnozer",
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"args": [
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"list-tags",
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"--config", "config.example.yaml",
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"Simulation Items.Bucket Brigade",
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"--recursive",
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"--json"
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],
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"cwd": "${workspaceFolder}",
|
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|
"console": "integratedTerminal",
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|
"justMyCode": false,
|
||||||
|
"env": {
|
||||||
|
"PYTHONUNBUFFERED": "1"
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||||||
|
}
|
||||||
|
}
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],
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"inputs": [
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{
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"id": "dcomHost",
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"type": "promptString",
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"description": "Remote host to enumerate OPC DA servers from (via DCOM)",
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"default": "CONTROL-HOST01"
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}
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||||||
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]
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||||||
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}
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Vendored
+6
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{
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||||||
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// OPC DA wrappers (OPCAutomation.dll / GBDaCtl.dll) are 32-bit in-proc COM
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// DLLs — the interpreter bitness must match (SPECIFICATION §11).
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"python.defaultInterpreterPath": "${workspaceFolder}/.venv/Scripts/python.exe",
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"python-envs.defaultEnvManager": "ms-python.python:venv"
|
||||||
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}
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# OPC DA Diagnozer
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A read-only Windows service that acts as an independent OPC DA reference client to
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diagnose **disconnections**, **communication latency**, and **data-quality problems**
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between a SCADA system and a control system communicating over OPC DA.
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It continuously connects to the OPC DA server, polls a pre-defined list of tags, and
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reports every anomaly with precise timestamps — unnatural read latencies, DCOM
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disconnects, hung RPC calls, tags marked BAD/UNCERTAIN, stale timestamps, frozen values,
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and flapping quality — as structured events (JSONL logs, Windows Event Log, optional
|
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HTTP webhook).
|
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> **Status:** planning. Read the
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> [specification](docs/SPECIFICATION.md) and the
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> [implementation plan](docs/IMPLEMENTATION_PLAN.md) first.
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## Why
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||||||
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OPC DA failures are notoriously hard to pin down because they hide behind generic COM
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errors, calls that hang with no timeout, or silently degraded item quality. This tool
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answers the triage question *where is the problem?* with evidence:
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| Observation from the Diagnozer | Most likely problem location |
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|--------------------------------|------------------------------|
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| Clean reads while SCADA complains | SCADA host itself (DCOM perms, CPU, its own load) |
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| Diagnozer also sees disconnects/RPC errors | Shared path: network, firewall, DCOM, OPC server host |
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| Connection stable but many tags `BAD_COMM_FAILURE` | Link between OPC server and the control devices |
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| Hangs without errors | Silent network drop (firewall/MTU) — classic DCOM pitfall |
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See the full interpretation matrix in the [specification](docs/SPECIFICATION.md).
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## Planned features
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- Windows service (auto-start, SCM crash recovery) with a foreground `run` mode for testing
|
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|
- Local or remote (DCOM) connections to any OPC DA server
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- Server browsing: `list-servers` (discovery), `list-devices` and `list-tags`
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(address-space walk) — live now
|
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- Latency monitoring: spikes, streaks, and p95 trends against configurable thresholds
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- Hang watchdog: flags RPC calls that never return — the silent killer
|
||||||
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- Quality monitoring: BAD/UNCERTAIN transitions with decoded subcodes, persistent-bad
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and flapping detection, mass-degradation alarm
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- Staleness & frozen-value detection while quality still reports GOOD
|
||||||
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- Structured events: rotating JSONL, Windows Event Log, optional HTTP webhook
|
||||||
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- Strictly read-only; single group, modest poll rate — does not perturb the measured system
|
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|
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||||||
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## Quick start
|
||||||
|
|
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```
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# list the OPC DA servers available locally (or on a DCOM host with --host)
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opcda-diagnozer list-servers
|
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opcda-diagnozer list-servers --host CONTROL-HOST01 # remote, via DCOM
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opcda-diagnozer list-servers --source registry --json # no-COM local scan
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# list the devices (address-space branches) of the configured server
|
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opcda-diagnozer list-devices
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opcda-diagnozer list-devices --depth 2 # include sub-devices
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opcda-diagnozer list-devices --json # script-friendly output
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# list the tags of one device (the item_id values go into config `tags:`)
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opcda-diagnozer list-tags "Simulation Items.Bucket Brigade"
|
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opcda-diagnozer list-tags "Simulation Items" "Bucket Brigade" # equivalent
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opcda-diagnozer list-tags --recursive "Simulation Items" # whole subtree
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opcda-diagnozer list-tags # every tag on the server
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# validate config
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opcda-diagnozer check-config
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# connect once and read every configured tag, print results
|
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opcda-diagnozer probe
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# foreground run (console) — best for first deployment validation
|
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opcda-diagnozer run
|
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|
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# install as Windows service (dedicated account required for DCOM auth)
|
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opcda-diagnozer install --account DOMAIN\svc-opcdiag
|
||||||
|
```
|
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`list-servers` uses two discovery mechanisms (`--source`): the OPC DA Automation
|
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Wrapper's `GetOPCServers` over COM (works remotely via DCOM; needs Launch+Activation
|
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|
permissions on the target host), and a local COM-registration scan that reads the OPC
|
||||||
|
DA component categories directly from the registry — no COM, useful on locked-down
|
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|
hosts or when the wrapper DLL is not registered. `auto` tries the first, falls back to
|
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the second. Note the bitness rule still applies: a 32-bit process enumerates the
|
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32-bit registry view — exactly the servers this tool can load.
|
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|
|
||||||
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`list-devices` / `list-tags` browse the **connected server's** address space through
|
||||||
|
the Automation Wrapper's browser (`CreateBrowser`): devices are *branches*, tags are
|
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*leaves*. They work locally and over DCOM (same Launch+Activation requirements). A
|
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device path is either one dotted string (`"Simulation Items.Bucket Brigade"`) or
|
||||||
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several quoted branch names — use the latter when a branch name itself contains a
|
||||||
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dot. On flat-namespace servers (`organization: flat`) every tag hangs directly off
|
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|
the root; `list-tags` without a device lists them all.
|
||||||
|
### Configuration example (`config.example.yaml`)
|
||||||
|
|
||||||
|
```yaml
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|
opc:
|
||||||
|
server: "Matrikon.OPC.Simulation.1" # server ProgID
|
||||||
|
host: "CONTROL-HOST01" # DCOM host; omit for local
|
||||||
|
connect_timeout_s: 10
|
||||||
|
|
||||||
|
poll:
|
||||||
|
interval_s: 1.0
|
||||||
|
timeout_ms: 5000 # beyond this the call is flagged as a hang
|
||||||
|
|
||||||
|
tags:
|
||||||
|
- { name: "Channel1.Device1.Counter", expect_change: true }
|
||||||
|
- { name: "Channel1.Device1.Level" }
|
||||||
|
|
||||||
|
latency:
|
||||||
|
warn_ms: 1000
|
||||||
|
critical_ms: 5000
|
||||||
|
slow_poll_streak: 5
|
||||||
|
window_polls: 60
|
||||||
|
|
||||||
|
quality:
|
||||||
|
persistent_bad_s: 30
|
||||||
|
flapping_transitions_per_window: 5
|
||||||
|
|
||||||
|
stale:
|
||||||
|
enabled: true
|
||||||
|
max_age_s: 120
|
||||||
|
|
||||||
|
report:
|
||||||
|
heartbeat_s: 300
|
||||||
|
jsonl: { dir: "C:/ProgramData/OPCDA-Diagnozer/logs", max_mb: 50, backups: 10 }
|
||||||
|
eventlog: { source: "OPCDA-Diagnozer", min_severity: WARN }
|
||||||
|
```
|
||||||
|
|
||||||
|
## DCOM troubleshooting quick reference
|
||||||
|
|
||||||
|
**Setup checklist for the service account (both hosts):**
|
||||||
|
1. `dcomcnfg` → Component Services → DCOM Config → the OPC server → Properties:
|
||||||
|
- Security → Launch & Activation: allow **Remote Activation** for the service account.
|
||||||
|
- Security → Access Permissions: allow Local + Remote access.
|
||||||
|
- Identity: prefer a dedicated account over "Launching user".
|
||||||
|
2. Firewall on the OPC server host: TCP 135 (RPC endpoint mapper) + the RPC dynamic
|
||||||
|
port range (optionally restricted via `netsh int ipv4 set dynamicport tcp ...`).
|
||||||
|
3. NTP time sync on both hosts — OPC DA timestamps and staleness detection depend on it.
|
||||||
|
4. Be aware of post-2022 Windows **DCOM hardening** (KB5004442 family): DCOM activation
|
||||||
|
requires explicit authentication and may break legacy OPC setups with
|
||||||
|
`E_ACCESSDENIED`-type failures.
|
||||||
|
|
||||||
|
**Common HRESULTs the tool decodes and reports:**
|
||||||
|
|
||||||
|
| HRESULT | Meaning |
|
||||||
|
|---------|---------|
|
||||||
|
| `0x800706BA` | RPC server unavailable — server process down, firewall, or DCOM activation refused |
|
||||||
|
| `0x800706BE` | RPC call failed mid-flight — server crashed or connection reset |
|
||||||
|
| `0x80010108` | Object disconnected from clients — OPC server dropped us (crash/restart) |
|
||||||
|
| `0x80070005` | Access denied — DCOM security misconfiguration |
|
||||||
|
| `0x80040154` | Class not registered — wrong ProgID, or wrapper/server registered under a different bitness |
|
||||||
|
| `0xC0040007` | Invalid item ID — tag name wrong in config (surfaced by `probe`) |
|
||||||
|
|
||||||
|
**Bitness warning:** the OPC DA Automation Wrapper (`OPCAutomation.dll`) and the Graybox
|
||||||
|
wrapper are typically **32-bit in-proc DLLs** — the Python interpreter must match
|
||||||
|
(32-bit). This is decided and verified in Phase 0 of the implementation plan.
|
||||||
|
|
||||||
|
## Safety
|
||||||
|
|
||||||
|
- The tool never writes to the OPC server — there is no write path in the code.
|
||||||
|
- It uses one OPC group and a static, small tag list at a modest poll rate (default 1 s)
|
||||||
|
so it does not load the system it is measuring.
|
||||||
|
|
||||||
|
## Development setup
|
||||||
|
|
||||||
|
The OPC DA wrappers (`OPCAutomation.dll`, `GBDaCtl.dll`) are **32-bit in-proc COM DLLs**,
|
||||||
|
so the Python interpreter **must be 32-bit** (SPECIFICATION §11 / Phase 0 decision).
|
||||||
|
|
||||||
|
```powershell
|
||||||
|
# create the 32-bit venv (requires the 32-bit Python installed via the py launcher)
|
||||||
|
& "C:\Users\<user>\AppData\Local\Programs\Python\Python314-32\python.exe" -m venv .venv
|
||||||
|
& ".\.venv\Scripts\python.exe" -m pip install -e ".[dev]"
|
||||||
|
|
||||||
|
# verify bitness — must print 32
|
||||||
|
& ".\.venv\Scripts\python.exe" -c "import struct; print(struct.calcsize('P') * 8)"
|
||||||
|
|
||||||
|
# run the (COM-free) unit + fake-integration tests
|
||||||
|
& ".\.venv\Scripts\python.exe" -m pytest
|
||||||
|
```
|
||||||
|
|
||||||
|
Notes:
|
||||||
|
- Dependencies are chosen to be installable without a C compiler: **ruamel.yaml**
|
||||||
|
(pure Python) is used instead of PyYAML, which publishes no 32-bit CPython 3.14
|
||||||
|
wheels and whose sdist requires MSVC.
|
||||||
|
- COM-dependent modules (Automation Wrapper, Event Log, service) are import-guarded;
|
||||||
|
the unit test suite runs on any OS via the in-process fake client
|
||||||
|
(`opcda_diagnozer.opc.fake`).
|
||||||
|
- 32-bit CPython can be installed with the Python Install Manager
|
||||||
|
(`py install 3.14 -a x86`) or the installer from python.org ("Download Windows
|
||||||
|
installer (32-bit)").
|
||||||
|
|
||||||
|
## Documentation
|
||||||
|
|
||||||
|
- [Specification](docs/SPECIFICATION.md) — detection rules, event model, operational behavior, acceptance criteria
|
||||||
|
- [Implementation plan](docs/IMPLEMENTATION_PLAN.md) — phases, milestones, testing, risks
|
||||||
|
|
||||||
|
## License
|
||||||
|
|
||||||
|
TBD
|
||||||
@@ -0,0 +1,42 @@
|
|||||||
|
# OPC DA Diagnozer — example configuration.
|
||||||
|
# Copy to config.yaml and adjust. Every threshold below is configurable
|
||||||
|
# (defaults live in src/opcda_diagnozer/config.py; rules in docs/SPECIFICATION.md §6).
|
||||||
|
|
||||||
|
opc:
|
||||||
|
server: "Matrikon.OPC.Simulation.1" # OPC DA server ProgID
|
||||||
|
#host: "CONTROL-HOST01" # DCOM host; omit for a local server
|
||||||
|
connect_timeout_s: 10
|
||||||
|
|
||||||
|
poll:
|
||||||
|
interval_s: 1.0 # poll cadence; keep modest (read-only tool)
|
||||||
|
timeout_ms: 5000 # beyond this the call is flagged as a hang (D7)
|
||||||
|
hard_hang_s: 120 # COM thread abandoned + rebuilt after this (§10.4)
|
||||||
|
|
||||||
|
tags:
|
||||||
|
- { name: "Channel1.Device1.Counter", expect_change: true } # D13 frozen-value detection applies
|
||||||
|
- { name: "Channel1.Device1.Level" }
|
||||||
|
|
||||||
|
latency:
|
||||||
|
warn_ms: 1000 # D4 single-spike threshold
|
||||||
|
critical_ms: 5000 # D5 sustained-slow severity
|
||||||
|
slow_poll_streak: 5 # D5 consecutive slow polls
|
||||||
|
window_polls: 60 # D6 rolling window for the p95 trend
|
||||||
|
|
||||||
|
quality:
|
||||||
|
persistent_bad_s: 30 # D10 single tag BAD longer than this
|
||||||
|
flapping_transitions_per_window: 5 # D11 quality transitions per window...
|
||||||
|
flapping_window_s: 600 # ...within this window (10 min)
|
||||||
|
|
||||||
|
stale:
|
||||||
|
enabled: true
|
||||||
|
max_age_s: 120 # D12 device timestamp older than this while GOOD
|
||||||
|
|
||||||
|
report:
|
||||||
|
heartbeat_s: 300 # D15 periodic stats snapshot
|
||||||
|
jsonl:
|
||||||
|
dir: "C:/ProgramData/OPCDA-Diagnozer/logs"
|
||||||
|
max_mb: 50 # rotate after this size
|
||||||
|
backups: 10 # rotated files kept
|
||||||
|
eventlog:
|
||||||
|
source: "OPCDA-Diagnozer"
|
||||||
|
min_severity: WARN # INFO / WARN / CRITICAL
|
||||||
@@ -0,0 +1,211 @@
|
|||||||
|
# OPC DA Diagnozer — Implementation Plan
|
||||||
|
|
||||||
|
Companion to [`docs/SPECIFICATION.md`](SPECIFICATION.md). Targets **v1.0** as the first
|
||||||
|
production-deployable release.
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## 1. Milestones
|
||||||
|
|
||||||
|
| Milestone | Content | Exit condition |
|
||||||
|
|-----------|---------|----------------|
|
||||||
|
| **v0.1 — Foreground proof** | CLI reads configured tags once per second in a console, prints events | Successfully reads from a real (or simulation) OPC DA server |
|
||||||
|
| **v0.2 — Detection engine** | All detectors (D1–D15), event model, JSONL logging | Unit tests green; chaos scenarios produce correct events |
|
||||||
|
| **v0.5 — Windows service** | pywin32 service, watchdog/hang recovery, Event Log, CLI install/run | Runs unattended through reboot + server-kill test |
|
||||||
|
| **v1.0 — Production** | Packaging, runbook, 24 h soak, optional webhook | Acceptance criteria AC1–AC10 (spec §13) met |
|
||||||
|
|
||||||
|
## 2. Project layout
|
||||||
|
|
||||||
|
```
|
||||||
|
opcda-diagnozer/
|
||||||
|
├── README.md
|
||||||
|
├── pyproject.toml
|
||||||
|
├── config.example.yaml
|
||||||
|
├── docs/
|
||||||
|
│ ├── SPECIFICATION.md
|
||||||
|
│ └── IMPLEMENTATION_PLAN.md
|
||||||
|
├── src/opcda_diagnozer/
|
||||||
|
│ ├── __init__.py
|
||||||
|
│ ├── __main__.py # python -m opcda_diagnozer
|
||||||
|
│ ├── main.py # CLI: run / install / uninstall / check-config / probe / list-devices / list-tags
|
||||||
|
│ ├── config.py # pydantic-free typed config (dataclasses) + YAML load + validation
|
||||||
|
│ ├── events.py # DiagEvent, Severity, EventKind
|
||||||
|
│ ├── quality.py # OPC DA quality decode tables
|
||||||
|
│ ├── opc/
|
||||||
|
│ │ ├── base.py # OpcClient + Browser protocols, ReadResult, OpcError(hresult)
|
||||||
|
│ │ ├── discovery.py # list-servers: Automation GetOPCServers / registry scan
|
||||||
|
│ │ ├── browse.py # list-devices/list-tags: address-space walk (branches/leaves)
|
||||||
|
│ │ ├── automation.py # OPC DA Automation Wrapper adapter (OPCAutomation.dll)
|
||||||
|
│ │ └── fake.py # in-process fake client + fake address space (tests, demo)
|
||||||
|
│ ├── monitor/
|
||||||
|
│ │ ├── state.py # connection state machine + backoff
|
||||||
|
│ │ ├── poller.py # COM thread: connect → poll loop → feed detectors
|
||||||
|
│ │ └── detectors.py # D1–D15 rule implementations
|
||||||
|
│ ├── report/
|
||||||
|
│ │ ├── base.py # Reporter protocol
|
||||||
|
│ │ ├── jsonl.py # rotating JSONL file
|
||||||
|
│ │ ├── eventlog.py # Windows Event Log (WARN+)
|
||||||
|
│ │ └── http.py # optional webhook
|
||||||
|
│ └── service.py # pywin32 ServiceFramework wrapper
|
||||||
|
└── tests/
|
||||||
|
├── test_quality.py
|
||||||
|
├── test_detectors.py
|
||||||
|
├── test_state.py
|
||||||
|
├── test_config.py
|
||||||
|
└── test_poller_fake.py # end-to-end against opc.fake, no COM needed
|
||||||
|
```
|
||||||
|
|
||||||
|
## 3. Phase 0 — Feasibility & environment (≈0.5–1 day)
|
||||||
|
|
||||||
|
**Goal:** validate the COM access strategy against reality before building anything.
|
||||||
|
|
||||||
|
Tasks:
|
||||||
|
1. Identify target OPC DA server: ProgID, host, DA version, bitness (32/64-bit EXE?).
|
||||||
|
2. Choose wrapper backend:
|
||||||
|
- **A. OPC DA Automation Wrapper** (`OPCAutomation.dll`) — ubiquitous in industry,
|
||||||
|
ships with many SCADA installs; likely default.
|
||||||
|
- **B. OpenOPC / Graybox wrapper** (`GBDaCtl.dll`) — fallback.
|
||||||
|
- Note: both are typically **32-bit in-proc DLLs** → client Python must be 32-bit
|
||||||
|
(see spec §11). Decide interpreter bitness here.
|
||||||
|
3. Stand up a **test server** (Matrikon OPC Simulation Server, KepServerEX demo, or the
|
||||||
|
actual control-system server in a maintenance window) and successfully read one tag
|
||||||
|
from Python (`win32com.client.Dispatch`).
|
||||||
|
4. Verify DCOM configuration for the service account (`dcomcnfg`: Launch/Activation →
|
||||||
|
Remote Activation; Access → Local+Remote). Record required firewall ports
|
||||||
|
(TCP 135 + RPC dynamic range).
|
||||||
|
5. Record baseline behavior: normal read RTT, quality values, what error the wrapper
|
||||||
|
surfaces when the server is stopped (feeds D1 implementation).
|
||||||
|
|
||||||
|
**Exit:** a throwaway script reads ≥ 3 tags from the remote server with measured RTT.
|
||||||
|
|
||||||
|
## 4. Phase 1 — Core engine (≈2–3 days)
|
||||||
|
|
||||||
|
1. `config.py` — YAML config (see `config.example.yaml` sketch in README), dataclass
|
||||||
|
model, strict validation, `check-config` messages that explain exactly what is wrong.
|
||||||
|
2. `quality.py` — decode tables (spec §7), `decode_quality(raw: int) -> QualityInfo`.
|
||||||
|
3. `opc/base.py` — client abstraction:
|
||||||
|
```python
|
||||||
|
class OpcClient(Protocol):
|
||||||
|
def connect(self) -> None: ...
|
||||||
|
def read(self, tags: Sequence[str]) -> list[ReadResult]: ...
|
||||||
|
def close(self) -> None: ...
|
||||||
|
```
|
||||||
|
`ReadResult`: `tag, value, quality_raw, device_time, error` — plus per-call RTT
|
||||||
|
measured by the poller. COM errors are normalized to `OpcError` carrying the raw
|
||||||
|
`HRESULT` + decoded name.
|
||||||
|
4. `opc/automation.py` — Automation Wrapper adapter (single group, static items,
|
||||||
|
`SyncRead`); every COM exception mapped to `OpcError` with `win32com` scode.
|
||||||
|
5. `monitor/state.py` — state machine (spec §10.2), backoff, reconnect accounting.
|
||||||
|
6. `monitor/detectors.py` — D1–D15 as small pure functions/classes over
|
||||||
|
`PollOutcome` (list[ReadResult] + rtt_ms + error), using an injected clock for
|
||||||
|
testability. Rolling window (deque, size `window_polls`) for p95/streak logic.
|
||||||
|
7. `monitor/poller.py` — the single COM thread; watchdog logic for hang detection
|
||||||
|
(spec §10.4): a second thread timestamps poll starts/ends; on `hard_hang_s` the COM
|
||||||
|
thread is abandoned and rebuilt.
|
||||||
|
8. `events.py` — event dataclass + JSON serialization.
|
||||||
|
9. `opc/fake.py` — scriptable fake client (sequences of outcomes: good reads, errors,
|
||||||
|
hangs, quality flips) → powers the entire unit-test suite without COM/hardware.
|
||||||
|
|
||||||
|
**Exit:** `opcda-diagnozer run` (foreground console) produces correct events against the
|
||||||
|
fake client; unit tests for all detectors.
|
||||||
|
|
||||||
|
## 5. Phase 2 — Reporters (≈1 day)
|
||||||
|
|
||||||
|
1. `report/jsonl.py` — rotation (size + backups), atomic-ish append, header line with
|
||||||
|
config digest for provenance.
|
||||||
|
2. `report/eventlog.py` — pywin32 `win32evtlog` usage; map severities; source
|
||||||
|
registration via `install` step.
|
||||||
|
3. `report/http.py` — optional webhook with timeout + simple retry/drop on failure
|
||||||
|
(never blocks the poll loop; queue with bound).
|
||||||
|
4. Heartbeat assembly (D15): uptime, reconnects, RTT percentiles, tags-bad counts.
|
||||||
|
|
||||||
|
**Exit:** events visible in file + Event Log; heartbeat cadence verified.
|
||||||
|
|
||||||
|
## 6. Phase 3 — Windows service (≈1 day)
|
||||||
|
|
||||||
|
1. `service.py` — `win32serviceutil.ServiceFramework`; service host thread spawns the
|
||||||
|
COM worker; clean `stop` handling (`SetServiceStatus STOP_PENDING`, join with
|
||||||
|
timeout, abandon hung COM thread on shutdown).
|
||||||
|
2. CLI verbs: `install /uninstall /start /stop` (wraps `sc.exe` semantics),
|
||||||
|
`run` (foreground), `check-config`, `probe` (connect once, print one read),
|
||||||
|
`list-items` (browse validation tool).
|
||||||
|
3. SCM recovery config (`sc failure ... restart`), auto-start, service account
|
||||||
|
documentation.
|
||||||
|
4. Config/log default dir: `%ProgramData%\OPCDA-Diagnozer\`.
|
||||||
|
|
||||||
|
**Exit:** survives reboot; survives OPC-server kill (produces D1/D2 events, reconnects);
|
||||||
|
`probe` and `check-config` give usable diagnostics to an ops engineer.
|
||||||
|
|
||||||
|
## 7. Phase 4 — Integration & chaos testing (≈1–2 days)
|
||||||
|
|
||||||
|
Scenario matrix against a simulation server (and, when available, the real server):
|
||||||
|
|
||||||
|
| Scenario | How to inject | Expected events |
|
||||||
|
|----------|---------------|-----------------|
|
||||||
|
| Server process killed | `taskkill` | D1 (HRESULT), D2 with outage duration |
|
||||||
|
| Server service stopped/restarted | `net stop/start` | D1, D2 |
|
||||||
|
| Firewall drop (silent) | block outbound RPC ports / pull NIC | D7 hang, then D1 |
|
||||||
|
| Latency injection | Clumsy / `netsh` delay | D4 spikes, D5 streak, D6 trend |
|
||||||
|
| Device comm failure | simulation server "communication disturbance" items | D8 with `BAD_COMM_FAILURE`, D10 persistence |
|
||||||
|
| Quality oscillation | toggling sim items | D11 flapping |
|
||||||
|
| Stale/frozen tag | simulation server static item marked `expect_change` | D12 / D13 |
|
||||||
|
| Mass bad quality | all sim items to bad | D14 |
|
||||||
|
| Config errors | bad ProgID, unknown tag | fast fail + actionable message; `OPC_E_INVALIDITEMID` surfaced at startup |
|
||||||
|
| Soak | 24 h healthy run | no leaks, heartbeats every 5 min, zero false positives |
|
||||||
|
|
||||||
|
**Exit:** each row verified manually against the event log; AC2/AC3/AC4/AC5 confirmed.
|
||||||
|
|
||||||
|
## 8. Phase 5 — Packaging & docs (≈0.5–1 day)
|
||||||
|
|
||||||
|
- `pyproject.toml` wheel installable with pip into the chosen (32-bit) Python;
|
||||||
|
document the on-host install procedure (PyInstaller packaging for pywin32 services is
|
||||||
|
fragile — deferred).
|
||||||
|
- `README.md` finalized (install, config, DCOM checklist, HRESULT table).
|
||||||
|
- Ops runbook: how to read events, what each kind means (link to spec §12 matrix),
|
||||||
|
how to reconfigure thresholds, where evidence lives.
|
||||||
|
- Version 1.0.0 tag.
|
||||||
|
|
||||||
|
## 9. Testing strategy
|
||||||
|
|
||||||
|
- **Unit** (no COM): detectors against scripted `PollOutcome` sequences with a fake
|
||||||
|
clock; quality decode; config validation; backoff/state transitions; JSONL rotation.
|
||||||
|
- **Integration:** `test_poller_fake.py` runs the full poller+reporters against
|
||||||
|
`opc.fake` in-process — the whole event pipeline without Windows COM.
|
||||||
|
- **Manual/chaos:** Phase 4 matrix (necessarily on Windows against a real/simulated
|
||||||
|
OPC DA server — cannot be automated in CI without the DCOM environment).
|
||||||
|
- CI: unit + fake-integration tests run on any OS (COM adapters are import-guarded);
|
||||||
|
chaos tests are a documented manual procedure.
|
||||||
|
|
||||||
|
## 10. Risk register
|
||||||
|
|
||||||
|
| Risk | Impact | Mitigation |
|
||||||
|
|------|--------|------------|
|
||||||
|
| Wrapper DLL bitness mismatch (32-bit only) | Cannot load wrapper | Phase 0 decision; use 32-bit Python; keep client abstraction so backend can be swapped |
|
||||||
|
| Automation Wrapper not present on diag host | No COM access | Phase 0 check; ship/distribute wrapper install in runbook (vendor redistribution rules apply) |
|
||||||
|
| DCOM hardening (KB5004442) blocks activation | Connect fails with `E_ACCESSDENIED`/activation errors | Runbook covers `dcomcnfg` steps; events surface raw HRESULT |
|
||||||
|
| COM calls hang indefinitely | Service appears alive but blind | Explicit watchdog + thread recycling (spec §10.4) |
|
||||||
|
| COM apartment violations (cross-thread calls) | Random `RPC_E_WRONG_THREAD` crashes | Single dedicated COM thread; all COM handles stay on it |
|
||||||
|
| Our client perturbs the system | Skewed diagnosis | One group, static small tag list, 1 s default poll, read-only |
|
||||||
|
| pywin32 service + COM quirks (GIL, STA init) | Service instability | Phase 3 spike; foreground `run` mode always available as fallback |
|
||||||
|
| Tag list too large / wrong item IDs | Noise, misleading RTT | `probe` + `check-config` validate up-front; per-poll error accounting |
|
||||||
|
| SCADA/host clock skew | Misleading staleness events | Local receive time always recorded; `max_age_s` configurable |
|
||||||
|
|
||||||
|
## 11. Effort estimate
|
||||||
|
|
||||||
|
| Phase | Estimate |
|
||||||
|
|-------|----------|
|
||||||
|
| 0 Feasibility | 0.5–1 d |
|
||||||
|
| 1 Core engine | 2–3 d |
|
||||||
|
| 2 Reporters | 1 d |
|
||||||
|
| 3 Service | 1 d |
|
||||||
|
| 4 Chaos testing | 1–2 d |
|
||||||
|
| 5 Packaging/docs | 0.5–1 d |
|
||||||
|
| **Total v1.0** | **≈ 6–9 days** |
|
||||||
|
|
||||||
|
## 12. Definition of done (v1.0)
|
||||||
|
|
||||||
|
- All Phase 4 scenarios pass; AC1–AC10 (spec §13) verified.
|
||||||
|
- 24 h soak clean.
|
||||||
|
- README + runbook complete enough for an ops engineer to deploy unaided.
|
||||||
|
- Code reviewed; no write path to OPC anywhere in the codebase.
|
||||||
|
- Config example covers every configurable threshold.
|
||||||
@@ -0,0 +1,263 @@
|
|||||||
|
# OPC DA Diagnozer — Project Specification
|
||||||
|
|
||||||
|
**Version:** 0.1 (draft)
|
||||||
|
**Status:** Planning
|
||||||
|
**Target platform:** Windows only (OPC DA is a COM/DCOM technology)
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## 1. Problem statement
|
||||||
|
|
||||||
|
We experience intermittent **disconnections** and/or **high communication latency** between a
|
||||||
|
SCADA system and a control system that communicate over **OPC DA** (Data Access, the
|
||||||
|
COM/DCOM-based predecessor of OPC UA). Today we have no objective evidence to answer the
|
||||||
|
key triage question:
|
||||||
|
|
||||||
|
> *Is the problem in the SCADA host, the network/DCOM layer, the OPC DA server, or the
|
||||||
|
> link between the OPC server and the control devices?*
|
||||||
|
|
||||||
|
OPC DA failure modes are notoriously hard to diagnose because failures surface as generic
|
||||||
|
`HRESULT` errors, hung calls with **no client-side timeout**, or silently degraded item
|
||||||
|
quality — long before the SCADA operator sees anything.
|
||||||
|
|
||||||
|
## 2. Approach
|
||||||
|
|
||||||
|
Deploy an **independent, read-only OPC DA reference client** that continuously exercises
|
||||||
|
the same path the SCADA uses:
|
||||||
|
|
||||||
|
- Connect to the OPC DA server (local or remote via DCOM) from a Windows machine.
|
||||||
|
- Poll a small, pre-defined list of tags at a fixed interval.
|
||||||
|
- Measure **read round-trip time (RTT)**, track **item quality** (GOOD / UNCERTAIN / BAD
|
||||||
|
and subcodes), **device timestamps**, and **connection state**.
|
||||||
|
- Emit structured, timestamped **diagnostic events** whenever anything deviates from
|
||||||
|
normal — disconnects, slow reads, hung calls, quality degradation, frozen/stale values.
|
||||||
|
|
||||||
|
Because the client is independent of the SCADA, its observations provide a **reference
|
||||||
|
baseline** against which the SCADA's complaints can be triangulated (see §12).
|
||||||
|
|
||||||
|
## 3. Deployment architecture
|
||||||
|
|
||||||
|
```mermaid
|
||||||
|
flowchart LR
|
||||||
|
subgraph SCADAzone["SCADA zone (or dedicated diag host)"]
|
||||||
|
DIAG["OPC DA Diagnozer<br/>(Windows service)"]
|
||||||
|
end
|
||||||
|
subgraph CTL["Control system / OPC DA server host"]
|
||||||
|
OPC["OPC DA server<br/>(COM/DCOM out-of-proc)"]
|
||||||
|
DEV["Control devices / PLC link"]
|
||||||
|
end
|
||||||
|
DIAG -- "DCOM reads (RPC 135 + dynamic ports)" --> OPC
|
||||||
|
OPC -.-> DEV
|
||||||
|
DIAG -- "Events (JSONL / Event Log / HTTP)" --> OPS["Engineers & monitoring"]
|
||||||
|
```
|
||||||
|
|
||||||
|
Placement note: run the tool **as close to the SCADA machine as possible** (same host or
|
||||||
|
same network segment) so its measured latencies are comparable to what the SCADA
|
||||||
|
experiences. Optionally run a second instance next to the OPC server host for differential
|
||||||
|
diagnosis.
|
||||||
|
|
||||||
|
## 4. Goals
|
||||||
|
|
||||||
|
1. Run unattended as a **Windows service** (auto-start, SCM crash recovery).
|
||||||
|
2. Connect to a configured OPC DA server (local or remote DCOM) and read a configured tag list.
|
||||||
|
3. Detect and report, with precise timestamps:
|
||||||
|
- disconnections and reconnects (including DCOM error codes),
|
||||||
|
- hung / timed-out RPC calls,
|
||||||
|
- read latencies exceeding thresholds (single spikes, streaks, and trends),
|
||||||
|
- tags whose quality is BAD or UNCERTAIN (with decoded subcode),
|
||||||
|
- persistent-bad and flapping (oscillating) quality per tag,
|
||||||
|
- stale device timestamps / frozen values while quality reports GOOD,
|
||||||
|
- mass quality degradation (many tags BAD at once → control-link problem).
|
||||||
|
4. Produce durable, machine-readable evidence (structured logs + Windows Event Log +
|
||||||
|
optional HTTP webhook) suitable for incident review and correlation.
|
||||||
|
5. Be **strictly read-only** and lightweight — must not perturb the system it measures.
|
||||||
|
|
||||||
|
## 5. Non-goals (v1)
|
||||||
|
|
||||||
|
- No writes to the OPC server (no `Write` code path at all).
|
||||||
|
- No OPC UA, OPC HDA, or Alarms & Events support.
|
||||||
|
- No data historian / storage of every sample (only events + periodic summaries).
|
||||||
|
- No UI/dashboard in v1 (JSONL logs + webhook are enough for Loki/Grafana ingestion).
|
||||||
|
- No automatic remediation (diagnose only).
|
||||||
|
|
||||||
|
## 6. Detection rules
|
||||||
|
|
||||||
|
| ID | Condition | Default rule | Severity |
|
||||||
|
|----|-----------|--------------|----------|
|
||||||
|
| D1 | Connection lost | Any read/connect COM failure | CRITICAL (event incl. decoded HRESULT) |
|
||||||
|
| D2 | Reconnect succeeded | After D1, reconnect works | INFO (event with outage duration) |
|
||||||
|
| D3 | Reconnect flapping | > 3 disconnects in 10 min | CRITICAL |
|
||||||
|
| D4 | Slow poll (spike) | Single read RTT > `warn_ms` (default 1000) | WARN |
|
||||||
|
| D5 | Sustained slow polls | RTT > `warn_ms` for `slow_poll_streak` (5) consecutive polls | CRITICAL |
|
||||||
|
| D6 | Latency trend | p95 RTT over last `window_polls` (60) > `warn_ms` | WARN |
|
||||||
|
| D7 | Poll hang | Read call does not return within `timeout_ms` (5000) — see §10.4 | CRITICAL (immediate), see recovery behavior |
|
||||||
|
| D8 | Tag quality → BAD | Any transition into BAD, decoded subcode | WARN (per tag) |
|
||||||
|
| D9 | Tag quality → UNCERTAIN | Any transition into UNCERTAIN | INFO |
|
||||||
|
| D10 | Persistent bad tag | Single tag BAD longer than `persistent_bad_s` (30) | WARN (escalated from D8) |
|
||||||
|
| D11 | Quality flapping | > 5 quality transitions for one tag within 10 min | WARN |
|
||||||
|
| D12 | Stale timestamp | Device timestamp older than `max_age_s` (120) while quality GOOD | WARN |
|
||||||
|
| D13 | Frozen value | `expect_change: true` tag with unchanged value+timestamp for `max_age_s` | WARN |
|
||||||
|
| D14 | Mass quality degradation | ≥ 50% of monitored tags BAD simultaneously while connection OK | CRITICAL (`CONTROL_LINK_DEGRADED` — points at OPC-server↔device link, not DCOM) |
|
||||||
|
| D15 | Heartbeat / summary | Periodic stats snapshot every `heartbeat_s` (300) | INFO |
|
||||||
|
|
||||||
|
All thresholds are configurable; severities are INFO / WARN / CRITICAL.
|
||||||
|
|
||||||
|
## 7. OPC DA quality codes (reference)
|
||||||
|
|
||||||
|
OPC DA quality is a 16-bit field. Bits 7–6 of the low byte give the class:
|
||||||
|
`0xC0` GOOD, `0x40` UNCERTAIN, `0x00` BAD. Bits 5–0 are the substatus. Values the tool
|
||||||
|
decodes and names:
|
||||||
|
|
||||||
|
| Code | Meaning |
|
||||||
|
|------|---------|
|
||||||
|
| `0xC0` | GOOD |
|
||||||
|
| `0xD8` | GOOD / local override |
|
||||||
|
| `0x44` | UNCERTAIN / last usable value |
|
||||||
|
| `0x40` | UNCERTAIN (unspecified) |
|
||||||
|
| `0x00` | BAD (unspecified) |
|
||||||
|
| `0x04` | BAD / configuration error |
|
||||||
|
| `0x08` | BAD / not connected |
|
||||||
|
| `0x0C` | BAD / device failure |
|
||||||
|
| `0x10` | BAD / sensor failure |
|
||||||
|
| `0x14` | BAD / last known value |
|
||||||
|
| `0x18` | BAD / communication failure |
|
||||||
|
| `0x1C` | BAD / out of service |
|
||||||
|
|
||||||
|
Remaining UNCERTAIN subcodes (DA 2.05a) are decoded by the same table in `quality.py`.
|
||||||
|
Every quality event carries the raw hex code **and** the decoded name.
|
||||||
|
|
||||||
|
## 8. Event model
|
||||||
|
|
||||||
|
Every event is a structured record:
|
||||||
|
|
||||||
|
```json
|
||||||
|
{
|
||||||
|
"time_utc": "2026-10-07T12:34:56.789Z",
|
||||||
|
"kind": "QUALITY_BAD",
|
||||||
|
"severity": "WARN",
|
||||||
|
"detail": {
|
||||||
|
"tag": "Channel1.Device1.Counter",
|
||||||
|
"quality_raw": "0x18",
|
||||||
|
"quality": "BAD_COMM_FAILURE",
|
||||||
|
"previous_quality": "GOOD",
|
||||||
|
"value": 1234.0,
|
||||||
|
"device_time_utc": "2026-10-07T12:34:55.100Z",
|
||||||
|
"rtt_ms": 42.1
|
||||||
|
},
|
||||||
|
"context": {
|
||||||
|
"uptime_s": 3600.5,
|
||||||
|
"reconnects_total": 2,
|
||||||
|
"rtt_p95_ms": 55.2,
|
||||||
|
"tags_bad": 3,
|
||||||
|
"tags_total": 25
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
`time_utc` is always the **local client receive time** (wall clock), so events remain
|
||||||
|
comparable even if the remote host's clock is wrong. Device timestamps are reported
|
||||||
|
alongside and clearly labeled.
|
||||||
|
|
||||||
|
## 9. Outputs (reporters)
|
||||||
|
|
||||||
|
| Reporter | Purpose | Notes |
|
||||||
|
|----------|---------|-------|
|
||||||
|
| JSONL rotating file | Primary evidence trail | One JSON event per line; rotation by size; default dir `%ProgramData%\OPCDA-Diagnozer\logs` |
|
||||||
|
| Windows Event Log | Ops visibility | WARN+ only; source `OPCDA-Diagnozer` |
|
||||||
|
| Console | Foreground/debug runs | Human-readable |
|
||||||
|
| HTTP webhook (optional) | Alert integration | POST one JSON event per request, optional bearer token |
|
||||||
|
|
||||||
|
Reporters are pluggable (`Reporter.emit(event)`); a heartbeat event every 5 minutes
|
||||||
|
proves liveness and enables baseline graphs even when everything is healthy.
|
||||||
|
|
||||||
|
## 10. Operational behavior
|
||||||
|
|
||||||
|
### 10.1 Run as a Windows service
|
||||||
|
- Registered via pywin32 (`opcda-diagnozer install`), auto-start, runs under a
|
||||||
|
**dedicated service account** (required for DCOM authentication, see §11).
|
||||||
|
- SCM recovery: restart on failure (first/second failure), plus internal watchdog.
|
||||||
|
|
||||||
|
### 10.2 Connection state machine
|
||||||
|
```mermaid
|
||||||
|
stateDiagram-v2
|
||||||
|
[*] --> Connecting
|
||||||
|
Connecting --> Connected : connect OK
|
||||||
|
Connecting --> ReconnectWait : COM error
|
||||||
|
Connected --> ReconnectWait : read error / hang
|
||||||
|
ReconnectWait --> Connecting : backoff elapsed
|
||||||
|
```
|
||||||
|
Reconnect backoff: exponential 1 s → 2 s → … capped at 60 s. Every disconnect/reconnect
|
||||||
|
pair is an event; outage duration is computed and reported.
|
||||||
|
|
||||||
|
### 10.3 COM apartment handling
|
||||||
|
All OPC/COM work runs on one dedicated STA thread inside the service process
|
||||||
|
(`pythoncom.CoInitialize()` on that thread only). Detectors run on the same thread (pure
|
||||||
|
Python, cheap); event reporting happens off-thread via a queue so slow I/O never blocks
|
||||||
|
polling.
|
||||||
|
|
||||||
|
### 10.4 The DCOM hang problem (important)
|
||||||
|
DCOM/RPC calls have **no client-side timeout**. If the network path breaks silently
|
||||||
|
(e.g., firewall drops), a read call can block for tens of seconds to minutes without
|
||||||
|
erroring. The tool handles this explicitly:
|
||||||
|
|
||||||
|
1. A watchdog flags a **poll hang** (D7) as soon as a call exceeds `timeout_ms`.
|
||||||
|
2. If the hang exceeds `hard_hang_s` (default 120 s), the service abandons the stuck
|
||||||
|
thread and creates a fresh connection on a new thread (stale `RPC` objects are
|
||||||
|
released by COM).
|
||||||
|
3. Hang events are distinguished from clean disconnects — this is often the smoking gun
|
||||||
|
for silent network drops.
|
||||||
|
|
||||||
|
### 10.5 Safety constraints
|
||||||
|
- Read-only by construction: no write API is called; the code has no write path.
|
||||||
|
- Single OPC group, static item list, modest poll rate (default 1 s) to keep added
|
||||||
|
server load negligible.
|
||||||
|
- Configuration errors fail fast at startup with actionable messages
|
||||||
|
(`opcda-diagnozer check-config` validates without connecting… and `--probe` connects
|
||||||
|
once and reports).
|
||||||
|
|
||||||
|
## 11. Environment & constraints
|
||||||
|
|
||||||
|
| Constraint | Consequence |
|
||||||
|
|------------|-------------|
|
||||||
|
| OPC DA is Windows/COM only | Service runs on Windows only (Server 2012 R2 … 2022, Win 10/11) |
|
||||||
|
| OPC DA wrappers are often **32-bit** DLLs (OPC DA Automation Wrapper `OPCAutomation.dll`, Graybox `GBDaCtl.dll`) | Python interpreter bitness must match the wrapper DLL — likely **32-bit Python** for v1; decision in Phase 0 |
|
||||||
|
| DCOM security | The service account needs Launch+Activation and Access permissions on the OPC server (via `dcomcnfg`); account must authenticate across the network (not `LocalSystem`) |
|
||||||
|
| Post-2022 Windows DCOM hardening (KB5004442 family) | DCOM activation now requires explicit authentication; legacy OPC setups may fail activation — errors must be reported clearly |
|
||||||
|
| RPC over TCP | Firewall: TCP 135 + RPC dynamic port range on the server host; misconfig shows up as `RPC_S_SERVER_UNAVAILABLE` |
|
||||||
|
| Clock skew | Device timestamps may be misleading; every event also carries local receive time; recommend NTP on both hosts |
|
||||||
|
|
||||||
|
## 12. Diagnostic interpretation matrix (why this tool exists)
|
||||||
|
|
||||||
|
| Observation from the Diagnozer | Most likely problem location |
|
||||||
|
|--------------------------------|------------------------------|
|
||||||
|
| Clean reads, low RTT, all GOOD — while SCADA still complains | SCADA host itself: per-machine DCOM permissions, CPU/memory saturation, its own group/subscription load |
|
||||||
|
| Diagnozer also sees disconnects / RPC errors | Shared path: network, firewall, DCOM layer, or OPC server host |
|
||||||
|
| Connection stable, but `BAD_COMM_FAILURE` on many device tags | Link between the OPC server and the control devices (downstream of OPC) — **not** a DCOM/network problem |
|
||||||
|
| Slow RTT spikes at consistent times of day | Server load pattern; correlate with heartbeat summaries |
|
||||||
|
| Hangs without errors returned (D7) | Silent network drop (firewall/MTU/NIC) — classic DCOM pitfall |
|
||||||
|
| One instance (SCADA zone) slow, other (server zone) fast | Network segment between the zones |
|
||||||
|
|
||||||
|
## 13. Acceptance criteria (v1.0)
|
||||||
|
|
||||||
|
- **AC1** Runs as a service, survives reboot, auto-starts, recovers from a killed process.
|
||||||
|
- **AC2** Detects OPC server process stop within one poll interval (or one hang window for
|
||||||
|
silent drops).
|
||||||
|
- **AC3** Detects injected latency above thresholds within 1–2 polls; event contains
|
||||||
|
measured RTT.
|
||||||
|
- **AC4** Quality transitions produce events with raw code and decoded name.
|
||||||
|
- **AC5** Staleness/freeze detection within tolerance of `max_age_s`.
|
||||||
|
- **AC6** No OPC writes are ever issued (code review + no write path exists).
|
||||||
|
- **AC7** Events land in JSONL and Event Log; heartbeats appear even when all is healthy.
|
||||||
|
- **AC8** Invalid config fails fast with actionable messages.
|
||||||
|
- **AC9** Footprint ≤ ~50 MB RAM, ~0% CPU while idle-polling on a healthy link.
|
||||||
|
- **AC10** 24 h soak against a simulation server: no leaks, correct reconnect accounting.
|
||||||
|
|
||||||
|
## 14. Future extensions (post-v1)
|
||||||
|
|
||||||
|
- Async subscription monitoring (`IOPCAsyncIO2` DataChange) to compare push vs. poll
|
||||||
|
latency — validates the SCADA's actual callback path.
|
||||||
|
- Per-item latency bisection (read items individually to isolate a slow tag).
|
||||||
|
- SQLite time-series of samples for post-incident graphing.
|
||||||
|
- Prometheus exporter / Grafana dashboard.
|
||||||
|
- Email / Teams / webhook alerting with deduplication.
|
||||||
|
- Multi-server monitoring in one service.
|
||||||
@@ -0,0 +1,34 @@
|
|||||||
|
[build-system]
|
||||||
|
requires = ["setuptools>=69"]
|
||||||
|
build-backend = "setuptools.build_meta"
|
||||||
|
|
||||||
|
[project]
|
||||||
|
name = "opcda-diagnozer"
|
||||||
|
version = "0.1.0"
|
||||||
|
description = "Read-only OPC DA reference client that diagnoses disconnections, latency and data-quality problems between SCADA and control systems"
|
||||||
|
readme = "README.md"
|
||||||
|
requires-python = ">=3.10"
|
||||||
|
dependencies = [
|
||||||
|
# ruamel.yaml is pure Python: PyYAML publishes no win32 (32-bit) wheels for
|
||||||
|
# CPython 3.14 and its sdist build requires MSVC, which diag hosts lack
|
||||||
|
# (the interpreter itself must be 32-bit — SPECIFICATION §11 bitness rule).
|
||||||
|
"ruamel.yaml>=0.18",
|
||||||
|
# OPC DA is Windows/COM-only; every pywin32 import in the code is guarded
|
||||||
|
# so tests can run on any OS (IMPLEMENTATION_PLAN §9).
|
||||||
|
"pywin32>=306; sys_platform == 'win32'",
|
||||||
|
]
|
||||||
|
|
||||||
|
[project.optional-dependencies]
|
||||||
|
dev = [
|
||||||
|
"pytest>=8.0",
|
||||||
|
]
|
||||||
|
|
||||||
|
[project.scripts]
|
||||||
|
opcda-diagnozer = "opcda_diagnozer.main:main"
|
||||||
|
|
||||||
|
[tool.setuptools.packages.find]
|
||||||
|
where = ["src"]
|
||||||
|
|
||||||
|
[tool.pytest.ini_options]
|
||||||
|
testpaths = ["tests"]
|
||||||
|
addopts = "-ra"
|
||||||
@@ -0,0 +1,13 @@
|
|||||||
|
"""OPC DA Diagnozer — a read-only OPC DA reference diagnostic client.
|
||||||
|
|
||||||
|
Continuously polls a configured tag list over OPC DA and reports anomalies —
|
||||||
|
disconnections, latency, hung calls, quality degradation, stale/frozen values —
|
||||||
|
as structured events. See docs/SPECIFICATION.md.
|
||||||
|
|
||||||
|
Strictly read-only by construction: there is no write path to the OPC server
|
||||||
|
anywhere in this codebase (SPECIFICATION §10.5).
|
||||||
|
"""
|
||||||
|
|
||||||
|
__version__ = "0.1.0"
|
||||||
|
|
||||||
|
__all__ = ["__version__"]
|
||||||
@@ -0,0 +1,6 @@
|
|||||||
|
"""Support for ``python -m opcda_diagnozer``."""
|
||||||
|
|
||||||
|
from opcda_diagnozer.main import main
|
||||||
|
|
||||||
|
if __name__ == "__main__":
|
||||||
|
raise SystemExit(main())
|
||||||
@@ -0,0 +1,255 @@
|
|||||||
|
"""Typed configuration: dataclasses, YAML loading and strict validation.
|
||||||
|
|
||||||
|
Pydantic-free by design (IMPLEMENTATION_PLAN §4.1). Every validation error is
|
||||||
|
actionable: it names the offending key and explains what is wrong, so
|
||||||
|
``opcda-diagnozer check-config`` output lets an ops engineer fix the file
|
||||||
|
without reading the code.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from dataclasses import MISSING, dataclass, field, fields, replace
|
||||||
|
from pathlib import Path
|
||||||
|
from typing import Any
|
||||||
|
|
||||||
|
from ruamel.yaml import YAML
|
||||||
|
from ruamel.yaml.error import YAMLError
|
||||||
|
|
||||||
|
_yaml = YAML(typ="safe") # pure-Python safe loader; config files are small
|
||||||
|
|
||||||
|
|
||||||
|
class ConfigError(Exception):
|
||||||
|
"""Invalid configuration; the message is user-facing (check-config output)."""
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class OpcConfig:
|
||||||
|
# server: OPC DA server ProgID, e.g. "Matrikon.OPC.Simulation.1"
|
||||||
|
# host: DCOM host; None means a local (same-machine) server
|
||||||
|
server: str
|
||||||
|
host: str | None = None
|
||||||
|
connect_timeout_s: float = 10.0
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class TagEntry:
|
||||||
|
# expect_change: True -> frozen-value detection (D13) applies to this tag
|
||||||
|
name: str
|
||||||
|
expect_change: bool = False
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class PollConfig:
|
||||||
|
interval_s: float = 1.0
|
||||||
|
timeout_ms: int = 5000 # D7: beyond this the call is flagged as a hang
|
||||||
|
hard_hang_s: float = 120.0 # SPECIFICATION §10.4: abandon + rebuild the COM thread
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class LatencyConfig:
|
||||||
|
warn_ms: float = 1000.0 # D4 spike threshold
|
||||||
|
critical_ms: float = 5000.0 # D5 sustained-slow severity
|
||||||
|
slow_poll_streak: int = 5 # D5 consecutive slow polls
|
||||||
|
window_polls: int = 60 # D6 rolling window for the p95 trend
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class QualityConfig:
|
||||||
|
persistent_bad_s: float = 30.0 # D10
|
||||||
|
flapping_transitions_per_window: int = 5 # D11
|
||||||
|
flapping_window_s: float = 600.0 # D11 window (10 min)
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class StaleConfig:
|
||||||
|
enabled: bool = True
|
||||||
|
max_age_s: float = 120.0 # D12 / D13
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class JsonlConfig:
|
||||||
|
dir: str = "C:/ProgramData/OPCDA-Diagnozer/logs"
|
||||||
|
max_mb: int = 50
|
||||||
|
backups: int = 10
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class EventLogConfig:
|
||||||
|
source: str = "OPCDA-Diagnozer"
|
||||||
|
min_severity: str = "WARN" # INFO / WARN / CRITICAL
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class ReportConfig:
|
||||||
|
heartbeat_s: float = 300.0 # D15
|
||||||
|
jsonl: JsonlConfig = field(default_factory=JsonlConfig)
|
||||||
|
eventlog: EventLogConfig = field(default_factory=EventLogConfig)
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class Config:
|
||||||
|
"""Fully validated tool configuration (see config.example.yaml)."""
|
||||||
|
|
||||||
|
opc: OpcConfig
|
||||||
|
poll: PollConfig = field(default_factory=PollConfig)
|
||||||
|
tags: tuple[TagEntry, ...] = ()
|
||||||
|
latency: LatencyConfig = field(default_factory=LatencyConfig)
|
||||||
|
quality: QualityConfig = field(default_factory=QualityConfig)
|
||||||
|
stale: StaleConfig = field(default_factory=StaleConfig)
|
||||||
|
report: ReportConfig = field(default_factory=ReportConfig)
|
||||||
|
|
||||||
|
|
||||||
|
_ALLOWED_TOP_LEVEL = {"opc", "poll", "tags", "latency", "quality", "stale", "report"}
|
||||||
|
_TAG_KEYS = {"name", "expect_change"}
|
||||||
|
|
||||||
|
|
||||||
|
def _build_section(cls: type[Any], data: Any, where: str) -> Any:
|
||||||
|
"""Instantiate a frozen dataclass section, rejecting unknown/missing keys."""
|
||||||
|
data = {} if data is None else data
|
||||||
|
if not isinstance(data, dict):
|
||||||
|
raise ConfigError(f"{where}: must be a mapping, got {type(data).__name__}")
|
||||||
|
known = {f.name for f in fields(cls)}
|
||||||
|
unknown = sorted(set(data) - known)
|
||||||
|
if unknown:
|
||||||
|
raise ConfigError(f"{where}: unknown key(s) {unknown}; accepted keys: {sorted(known)}")
|
||||||
|
for f in fields(cls):
|
||||||
|
if f.name not in data and f.default is MISSING and f.default_factory is MISSING:
|
||||||
|
raise ConfigError(f"{where}: missing required key '{f.name}'")
|
||||||
|
try:
|
||||||
|
return cls(**data)
|
||||||
|
except TypeError as exc:
|
||||||
|
raise ConfigError(f"{where}: {exc}") from None
|
||||||
|
|
||||||
|
|
||||||
|
def _build_report(data: Any) -> ReportConfig:
|
||||||
|
data = {} if data is None else dict(data)
|
||||||
|
jsonl = _build_section(JsonlConfig, data.pop("jsonl", None), "report.jsonl")
|
||||||
|
eventlog = _build_section(EventLogConfig, data.pop("eventlog", None), "report.eventlog")
|
||||||
|
rest = _build_section(ReportConfig, data, "report")
|
||||||
|
return replace(rest, jsonl=jsonl, eventlog=eventlog)
|
||||||
|
|
||||||
|
|
||||||
|
def _build_tags(data: Any) -> tuple[TagEntry, ...]:
|
||||||
|
if data is None:
|
||||||
|
return ()
|
||||||
|
if not isinstance(data, list):
|
||||||
|
raise ConfigError(f"tags: must be a list, got {type(data).__name__}")
|
||||||
|
entries: list[TagEntry] = []
|
||||||
|
for i, item in enumerate(data):
|
||||||
|
if isinstance(item, str):
|
||||||
|
if not item.strip():
|
||||||
|
raise ConfigError(f"tags[{i}]: name must be a non-empty string")
|
||||||
|
entries.append(TagEntry(name=item))
|
||||||
|
continue
|
||||||
|
if not isinstance(item, dict):
|
||||||
|
raise ConfigError(
|
||||||
|
f"tags[{i}]: must be a tag name string or a mapping with 'name'"
|
||||||
|
" (and optional 'expect_change')"
|
||||||
|
)
|
||||||
|
name = item.get("name")
|
||||||
|
if not isinstance(name, str) or not name.strip():
|
||||||
|
raise ConfigError(f"tags[{i}]: 'name' is required and must be a non-empty string")
|
||||||
|
unknown = sorted(set(item) - _TAG_KEYS)
|
||||||
|
if unknown:
|
||||||
|
raise ConfigError(f"tags[{i}]: unknown key(s) {unknown}; accepted keys: {sorted(_TAG_KEYS)}")
|
||||||
|
expect = item.get("expect_change", False)
|
||||||
|
if not isinstance(expect, bool):
|
||||||
|
raise ConfigError(
|
||||||
|
f"tags[{i}]: 'expect_change' must be a boolean, got {type(expect).__name__}"
|
||||||
|
)
|
||||||
|
entries.append(TagEntry(name=name, expect_change=expect))
|
||||||
|
return tuple(entries)
|
||||||
|
|
||||||
|
|
||||||
|
def _validate(config: Config) -> None:
|
||||||
|
"""Cross-field validation; each message names the offending key."""
|
||||||
|
if not config.opc.server or not config.opc.server.strip():
|
||||||
|
raise ConfigError(
|
||||||
|
"opc.server: required — the OPC DA server ProgID, "
|
||||||
|
"e.g. 'Matrikon.OPC.Simulation.1'"
|
||||||
|
)
|
||||||
|
if config.opc.connect_timeout_s <= 0:
|
||||||
|
raise ConfigError(f"opc.connect_timeout_s: must be > 0, got {config.opc.connect_timeout_s}")
|
||||||
|
if not config.tags:
|
||||||
|
raise ConfigError(
|
||||||
|
"tags: at least one tag is required — without tags there is nothing to monitor"
|
||||||
|
)
|
||||||
|
names = [t.name for t in config.tags]
|
||||||
|
duplicates = sorted({n for n in names if names.count(n) > 1})
|
||||||
|
if duplicates:
|
||||||
|
raise ConfigError(f"tags: duplicate tag name(s) {duplicates}")
|
||||||
|
if config.poll.interval_s <= 0:
|
||||||
|
raise ConfigError(f"poll.interval_s: must be > 0, got {config.poll.interval_s}")
|
||||||
|
if config.poll.timeout_ms <= 0:
|
||||||
|
raise ConfigError(f"poll.timeout_ms: must be > 0, got {config.poll.timeout_ms}")
|
||||||
|
if config.poll.hard_hang_s * 1000 <= config.poll.timeout_ms:
|
||||||
|
raise ConfigError(
|
||||||
|
f"poll.hard_hang_s: must exceed poll.timeout_ms "
|
||||||
|
f"({config.poll.timeout_ms} ms); got {config.poll.hard_hang_s} s"
|
||||||
|
)
|
||||||
|
if not 0 < config.latency.warn_ms <= config.latency.critical_ms:
|
||||||
|
raise ConfigError(
|
||||||
|
"latency.warn_ms: must satisfy 0 < warn_ms <= critical_ms "
|
||||||
|
f"(got warn_ms={config.latency.warn_ms}, critical_ms={config.latency.critical_ms})"
|
||||||
|
)
|
||||||
|
if config.latency.slow_poll_streak < 1:
|
||||||
|
raise ConfigError(f"latency.slow_poll_streak: must be >= 1, got {config.latency.slow_poll_streak}")
|
||||||
|
if config.latency.window_polls < 1:
|
||||||
|
raise ConfigError(f"latency.window_polls: must be >= 1, got {config.latency.window_polls}")
|
||||||
|
if config.quality.persistent_bad_s <= 0:
|
||||||
|
raise ConfigError(f"quality.persistent_bad_s: must be > 0, got {config.quality.persistent_bad_s}")
|
||||||
|
if config.quality.flapping_transitions_per_window < 1:
|
||||||
|
raise ConfigError(
|
||||||
|
f"quality.flapping_transitions_per_window: must be >= 1, "
|
||||||
|
f"got {config.quality.flapping_transitions_per_window}"
|
||||||
|
)
|
||||||
|
if config.quality.flapping_window_s <= 0:
|
||||||
|
raise ConfigError(f"quality.flapping_window_s: must be > 0, got {config.quality.flapping_window_s}")
|
||||||
|
if config.stale.enabled and config.stale.max_age_s <= 0:
|
||||||
|
raise ConfigError(f"stale.max_age_s: must be > 0, got {config.stale.max_age_s}")
|
||||||
|
if config.report.heartbeat_s <= 0:
|
||||||
|
raise ConfigError(f"report.heartbeat_s: must be > 0, got {config.report.heartbeat_s}")
|
||||||
|
if config.report.eventlog.min_severity not in ("INFO", "WARN", "CRITICAL"):
|
||||||
|
raise ConfigError(
|
||||||
|
"report.eventlog.min_severity: must be one of INFO/WARN/CRITICAL, "
|
||||||
|
f"got {config.report.eventlog.min_severity!r}"
|
||||||
|
)
|
||||||
|
if config.report.jsonl.max_mb < 1:
|
||||||
|
raise ConfigError(f"report.jsonl.max_mb: must be >= 1, got {config.report.jsonl.max_mb}")
|
||||||
|
if config.report.jsonl.backups < 0:
|
||||||
|
raise ConfigError(f"report.jsonl.backups: must be >= 0, got {config.report.jsonl.backups}")
|
||||||
|
|
||||||
|
|
||||||
|
def load_config(path: str | Path) -> Config:
|
||||||
|
"""Load and strictly validate a YAML configuration file."""
|
||||||
|
p = Path(path)
|
||||||
|
if not p.is_file():
|
||||||
|
raise ConfigError(f"config file not found: {p}")
|
||||||
|
try:
|
||||||
|
data = _yaml.load(p.read_text(encoding="utf-8"))
|
||||||
|
except YAMLError as exc:
|
||||||
|
raise ConfigError(f"{p}: invalid YAML: {exc}") from None
|
||||||
|
if data is None:
|
||||||
|
data = {}
|
||||||
|
if not isinstance(data, dict):
|
||||||
|
raise ConfigError(f"{p}: top level must be a mapping")
|
||||||
|
unknown_top = sorted(set(data) - _ALLOWED_TOP_LEVEL)
|
||||||
|
if unknown_top:
|
||||||
|
raise ConfigError(
|
||||||
|
f"{p}: unknown section(s) {unknown_top}; "
|
||||||
|
f"accepted sections: {sorted(_ALLOWED_TOP_LEVEL)}"
|
||||||
|
)
|
||||||
|
config = Config(
|
||||||
|
opc=_build_section(OpcConfig, data.get("opc"), "opc"),
|
||||||
|
poll=_build_section(PollConfig, data.get("poll"), "poll"),
|
||||||
|
tags=_build_tags(data.get("tags")),
|
||||||
|
latency=_build_section(LatencyConfig, data.get("latency"), "latency"),
|
||||||
|
quality=_build_section(QualityConfig, data.get("quality"), "quality"),
|
||||||
|
stale=_build_section(StaleConfig, data.get("stale"), "stale"),
|
||||||
|
report=_build_report(data.get("report")),
|
||||||
|
)
|
||||||
|
try:
|
||||||
|
_validate(config)
|
||||||
|
except TypeError as exc:
|
||||||
|
raise ConfigError(f"invalid value type in config: {exc}") from None
|
||||||
|
return config
|
||||||
@@ -0,0 +1,87 @@
|
|||||||
|
"""Event model: DiagEvent, Severity, EventKind (SPECIFICATION §8).
|
||||||
|
|
||||||
|
Every anomaly report is one :class:`DiagEvent`. ``time_utc`` is always the
|
||||||
|
**local client receive time** (wall clock), so events stay comparable even when
|
||||||
|
the remote host clock is wrong; device timestamps travel inside ``detail``,
|
||||||
|
clearly labeled (SPECIFICATION §8).
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
import json
|
||||||
|
from dataclasses import asdict, dataclass, field
|
||||||
|
from datetime import datetime, timezone
|
||||||
|
from enum import Enum
|
||||||
|
from typing import Any
|
||||||
|
|
||||||
|
|
||||||
|
def utc_now() -> datetime:
|
||||||
|
"""Timezone-aware current UTC time (the local receive clock)."""
|
||||||
|
return datetime.now(timezone.utc)
|
||||||
|
|
||||||
|
|
||||||
|
class Severity(str, Enum):
|
||||||
|
INFO = "INFO"
|
||||||
|
WARN = "WARN"
|
||||||
|
CRITICAL = "CRITICAL"
|
||||||
|
|
||||||
|
|
||||||
|
class EventKind(str, Enum):
|
||||||
|
"""Event kinds — one per detection rule D1–D15 (SPECIFICATION §6)."""
|
||||||
|
|
||||||
|
CONNECTED = "CONNECTED"
|
||||||
|
DISCONNECTED = "DISCONNECTED" # D1
|
||||||
|
RECONNECTED = "RECONNECTED" # D2
|
||||||
|
RECONNECT_FLAPPING = "RECONNECT_FLAPPING" # D3
|
||||||
|
SLOW_POLL = "SLOW_POLL" # D4
|
||||||
|
SLOW_POLL_STREAK = "SLOW_POLL_STREAK" # D5
|
||||||
|
LATENCY_TREND = "LATENCY_TREND" # D6
|
||||||
|
POLL_HANG = "POLL_HANG" # D7
|
||||||
|
QUALITY_BAD = "QUALITY_BAD" # D8
|
||||||
|
QUALITY_UNCERTAIN = "QUALITY_UNCERTAIN" # D9
|
||||||
|
QUALITY_BAD_PERSISTENT = "QUALITY_BAD_PERSISTENT" # D10
|
||||||
|
QUALITY_FLAPPING = "QUALITY_FLAPPING" # D11
|
||||||
|
STALE_TIMESTAMP = "STALE_TIMESTAMP" # D12
|
||||||
|
FROZEN_VALUE = "FROZEN_VALUE" # D13
|
||||||
|
CONTROL_LINK_DEGRADED = "CONTROL_LINK_DEGRADED" # D14
|
||||||
|
HEARTBEAT = "HEARTBEAT" # D15
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class EventContext:
|
||||||
|
"""Snapshot counters attached to every event (SPECIFICATION §8)."""
|
||||||
|
|
||||||
|
uptime_s: float
|
||||||
|
reconnects_total: int
|
||||||
|
rtt_p95_ms: float | None = None
|
||||||
|
tags_bad: int = 0
|
||||||
|
tags_total: int = 0
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class DiagEvent:
|
||||||
|
"""One structured diagnostic record — JSONL-ready via :meth:`to_json`."""
|
||||||
|
|
||||||
|
time_utc: datetime
|
||||||
|
kind: EventKind
|
||||||
|
severity: Severity
|
||||||
|
detail: dict[str, Any] = field(default_factory=dict)
|
||||||
|
context: EventContext | None = None
|
||||||
|
|
||||||
|
def to_json(self) -> str:
|
||||||
|
"""Serialize as one JSON line (SPECIFICATION §8, JSONL append-safe)."""
|
||||||
|
if self.time_utc.tzinfo is None:
|
||||||
|
raise ValueError("time_utc must be timezone-aware (use events.utc_now())")
|
||||||
|
payload: dict[str, Any] = {
|
||||||
|
"time_utc": _utc_z(self.time_utc),
|
||||||
|
"kind": self.kind.value,
|
||||||
|
"severity": self.severity.value,
|
||||||
|
"detail": self.detail,
|
||||||
|
"context": asdict(self.context) if self.context is not None else None,
|
||||||
|
}
|
||||||
|
return json.dumps(payload, ensure_ascii=False)
|
||||||
|
|
||||||
|
|
||||||
|
def _utc_z(dt: datetime) -> str:
|
||||||
|
"""ISO-8601 UTC with millisecond precision and a Z suffix."""
|
||||||
|
return dt.astimezone(timezone.utc).isoformat(timespec="milliseconds").replace("+00:00", "Z")
|
||||||
@@ -0,0 +1,377 @@
|
|||||||
|
"""Command-line interface (IMPLEMENTATION_PLAN §6.2).
|
||||||
|
|
||||||
|
Verbs: ``run``, ``probe``, ``check-config``, ``list-items`` plus the service
|
||||||
|
verbs ``install`` / ``uninstall`` / ``start`` / ``stop``. Currently functional:
|
||||||
|
``check-config``, ``list-servers`` (OPC DA server discovery) and the browse
|
||||||
|
verbs ``list-devices`` / ``list-tags`` (devices = branches, tags = leaves of
|
||||||
|
the connected server's address space); the remaining verbs land with Phases 1–3.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
import argparse
|
||||||
|
import sys
|
||||||
|
from collections.abc import Sequence
|
||||||
|
|
||||||
|
from opcda_diagnozer import __version__
|
||||||
|
from opcda_diagnozer.config import ConfigError, load_config
|
||||||
|
from opcda_diagnozer.opc.base import OpcError
|
||||||
|
from opcda_diagnozer.opc.discovery import ServerInfo, list_servers
|
||||||
|
|
||||||
|
DEFAULT_CONFIG = "config.yaml"
|
||||||
|
|
||||||
|
_NOT_IMPLEMENTED: dict[str, str] = {
|
||||||
|
"run": "Phase 1 (core engine)",
|
||||||
|
"probe": "Phase 1 (core engine)",
|
||||||
|
"list-items": "superseded by list-devices / list-tags",
|
||||||
|
"install": "Phase 3 (Windows service)",
|
||||||
|
"uninstall": "Phase 3 (Windows service)",
|
||||||
|
"start": "Phase 3 (Windows service)",
|
||||||
|
"stop": "Phase 3 (Windows service)",
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
def _add_config_option(parser: argparse.ArgumentParser) -> None:
|
||||||
|
parser.add_argument(
|
||||||
|
"--config", "-c",
|
||||||
|
default=DEFAULT_CONFIG,
|
||||||
|
help="path to the YAML config (default: %(default)s)",
|
||||||
|
)
|
||||||
|
|
||||||
|
|
||||||
|
def _build_parser() -> argparse.ArgumentParser:
|
||||||
|
parser = argparse.ArgumentParser(
|
||||||
|
prog="opcda-diagnozer",
|
||||||
|
description=(
|
||||||
|
"Read-only OPC DA reference client that diagnoses disconnections, "
|
||||||
|
"latency and data-quality problems (see docs/SPECIFICATION.md)."
|
||||||
|
),
|
||||||
|
)
|
||||||
|
parser.add_argument("--version", action="version", version=f"%(prog)s {__version__}")
|
||||||
|
sub = parser.add_subparsers(dest="verb", metavar="verb", required=True)
|
||||||
|
|
||||||
|
p = sub.add_parser("run", help="run in the foreground (console)")
|
||||||
|
_add_config_option(p)
|
||||||
|
|
||||||
|
p = sub.add_parser("probe", help="connect once and print one read of every configured tag")
|
||||||
|
_add_config_option(p)
|
||||||
|
|
||||||
|
p = sub.add_parser("check-config", help="validate the configuration and exit")
|
||||||
|
_add_config_option(p)
|
||||||
|
|
||||||
|
p = sub.add_parser("list-items", help="browse the server item space (validation tool)")
|
||||||
|
_add_config_option(p)
|
||||||
|
|
||||||
|
p = sub.add_parser(
|
||||||
|
"list-servers",
|
||||||
|
help="enumerate the OPC DA servers available locally or on a DCOM host",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--host",
|
||||||
|
metavar="HOST",
|
||||||
|
help="remote host to enumerate via DCOM (default: the local machine)",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--source",
|
||||||
|
choices=("auto", "automation", "registry"),
|
||||||
|
default="auto",
|
||||||
|
help="discovery mechanism: automation = OPC DA Automation Wrapper over COM; "
|
||||||
|
"registry = local COM-registration scan (no COM); auto = try automation, "
|
||||||
|
"fall back to registry (default: %(default)s)",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--json",
|
||||||
|
action="store_true",
|
||||||
|
help="emit one JSON object per server (for scripts) instead of a table",
|
||||||
|
)
|
||||||
|
|
||||||
|
p = sub.add_parser(
|
||||||
|
"list-devices",
|
||||||
|
help="list the devices (address-space branches) exposed by the configured server",
|
||||||
|
)
|
||||||
|
_add_config_option(p)
|
||||||
|
p.add_argument(
|
||||||
|
"--depth",
|
||||||
|
type=int,
|
||||||
|
default=1,
|
||||||
|
metavar="N",
|
||||||
|
help="how many branch levels to descend (default: %(default)s)",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--no-counts",
|
||||||
|
action="store_true",
|
||||||
|
help="skip fetching per-device tag counts (faster on huge servers)",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--json",
|
||||||
|
action="store_true",
|
||||||
|
help="emit one JSON object per device (for scripts) instead of a table",
|
||||||
|
)
|
||||||
|
|
||||||
|
p = sub.add_parser(
|
||||||
|
"list-tags",
|
||||||
|
help="list the tags (leaves) of one device, or every tag on the server",
|
||||||
|
)
|
||||||
|
_add_config_option(p)
|
||||||
|
p.add_argument(
|
||||||
|
"device",
|
||||||
|
nargs="*",
|
||||||
|
metavar="BRANCH",
|
||||||
|
help="device path: one or more branch names — either a single dotted string "
|
||||||
|
"in quotes ('\"Simulation Items.Bucket Brigade\"') or separate quoted "
|
||||||
|
"segments ('\"Simulation Items\" \"Bucket Brigade\"'). Default: the server root",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--recursive", "-r",
|
||||||
|
action="store_true",
|
||||||
|
help="walk the whole subtree, not just the device's direct tags",
|
||||||
|
)
|
||||||
|
p.add_argument(
|
||||||
|
"--json",
|
||||||
|
action="store_true",
|
||||||
|
help="emit one JSON object per tag (for scripts) instead of a table",
|
||||||
|
)
|
||||||
|
|
||||||
|
p = sub.add_parser("install", help="install as a Windows service (requires admin)")
|
||||||
|
_add_config_option(p)
|
||||||
|
p.add_argument(
|
||||||
|
"--account",
|
||||||
|
metavar="DOMAIN\\USER",
|
||||||
|
help="dedicated service account (required for DCOM authentication, SPECIFICATION §11)",
|
||||||
|
)
|
||||||
|
|
||||||
|
for verb, help_text in (
|
||||||
|
("uninstall", "remove the Windows service"),
|
||||||
|
("start", "start the Windows service"),
|
||||||
|
("stop", "stop the Windows service"),
|
||||||
|
):
|
||||||
|
sub.add_parser(verb, help=help_text)
|
||||||
|
|
||||||
|
return parser
|
||||||
|
|
||||||
|
|
||||||
|
def _cmd_check_config(config_path: str) -> int:
|
||||||
|
try:
|
||||||
|
config = load_config(config_path)
|
||||||
|
except ConfigError as exc:
|
||||||
|
print(f"check-config: FAILED\n {exc}", file=sys.stderr)
|
||||||
|
return 2
|
||||||
|
host = f" on host {config.opc.host!r}" if config.opc.host else " (local)"
|
||||||
|
expect_change = sum(1 for t in config.tags if t.expect_change)
|
||||||
|
print("check-config: OK")
|
||||||
|
print(f" server: {config.opc.server!r}{host}")
|
||||||
|
print(f" tags: {len(config.tags)} ({expect_change} with expect_change)")
|
||||||
|
print(f" poll: every {config.poll.interval_s} s, hang flagged after {config.poll.timeout_ms} ms")
|
||||||
|
return 0
|
||||||
|
|
||||||
|
|
||||||
|
def _print_servers(servers: list[ServerInfo], host: str | None, as_json: bool) -> None:
|
||||||
|
where = f" on {host!r}" if host else " (local machine)"
|
||||||
|
if as_json:
|
||||||
|
import json
|
||||||
|
|
||||||
|
for server in servers:
|
||||||
|
payload = {
|
||||||
|
"prog_id": server.prog_id,
|
||||||
|
"source": server.source,
|
||||||
|
"clsid": server.clsid,
|
||||||
|
"description": server.description,
|
||||||
|
"da_versions": list(server.da_versions),
|
||||||
|
}
|
||||||
|
print(json.dumps(payload, ensure_ascii=False))
|
||||||
|
return
|
||||||
|
if not servers:
|
||||||
|
print(f"no OPC DA servers found{where}")
|
||||||
|
return
|
||||||
|
print(f"OPC DA servers available{where}:")
|
||||||
|
width = max(len(s.prog_id) for s in servers)
|
||||||
|
for server in servers:
|
||||||
|
notes = [f"via {server.source}"]
|
||||||
|
if server.da_versions:
|
||||||
|
notes.append(", ".join(server.da_versions))
|
||||||
|
if server.description:
|
||||||
|
notes.append(server.description)
|
||||||
|
print(f" {server.prog_id:<{width}} ({'; '.join(notes)})")
|
||||||
|
|
||||||
|
|
||||||
|
def _cmd_list_servers(host: str | None, source: str, as_json: bool) -> int:
|
||||||
|
try:
|
||||||
|
servers = list_servers(host=host, source=source) # type: ignore[arg-type]
|
||||||
|
except OpcError as exc:
|
||||||
|
print(f"list-servers: FAILED\n {exc}", file=sys.stderr)
|
||||||
|
return 2
|
||||||
|
_print_servers(servers, host, as_json)
|
||||||
|
if not as_json and not servers and host is None and source in ("auto", "registry"):
|
||||||
|
print(
|
||||||
|
"hint: no servers found — is an OPC DA server installed on this host? "
|
||||||
|
"(servers that skip the OPC component categories are invisible to "
|
||||||
|
"this scan; try --source automation)",
|
||||||
|
file=sys.stderr,
|
||||||
|
)
|
||||||
|
return 0
|
||||||
|
|
||||||
|
|
||||||
|
def _connect_from_config(config_path: str):
|
||||||
|
"""Load the config and connect to its configured server (Automation Wrapper).
|
||||||
|
|
||||||
|
Returns the connected client; raises :class:`ConfigError` / :class:`OpcError`
|
||||||
|
with actionable messages for the caller to print.
|
||||||
|
"""
|
||||||
|
from opcda_diagnozer.opc.automation import AutomationOpcClient
|
||||||
|
|
||||||
|
config = load_config(config_path)
|
||||||
|
client = AutomationOpcClient(
|
||||||
|
server=config.opc.server,
|
||||||
|
host=config.opc.host,
|
||||||
|
connect_timeout_s=config.opc.connect_timeout_s,
|
||||||
|
)
|
||||||
|
client.connect()
|
||||||
|
return client
|
||||||
|
|
||||||
|
|
||||||
|
def _print_devices(space, as_json: bool) -> None:
|
||||||
|
"""Human table / JSON-lines output for the list-devices verb."""
|
||||||
|
if as_json:
|
||||||
|
import json
|
||||||
|
|
||||||
|
for device in space.devices:
|
||||||
|
payload = {
|
||||||
|
"name": device.name,
|
||||||
|
"path": list(device.path),
|
||||||
|
"qualified_name": device.qualified_name,
|
||||||
|
"sub_devices": list(device.sub_devices),
|
||||||
|
"tags": list(device.tag_names),
|
||||||
|
}
|
||||||
|
print(json.dumps(payload, ensure_ascii=False))
|
||||||
|
return
|
||||||
|
if not space.devices:
|
||||||
|
print(f"no devices (branches) found — organization: {space.organization}")
|
||||||
|
return
|
||||||
|
print(f"address space organization: {space.organization}")
|
||||||
|
print("devices:")
|
||||||
|
width = max(len(d.qualified_name) for d in space.devices)
|
||||||
|
for device in space.devices:
|
||||||
|
notes = [f"{len(device.tag_names)} tags"]
|
||||||
|
if device.sub_devices:
|
||||||
|
notes.append(f"{len(device.sub_devices)} sub-devices")
|
||||||
|
print(f" {device.qualified_name:<{width}} ({', '.join(notes)})")
|
||||||
|
|
||||||
|
|
||||||
|
def _cmd_list_devices(config_path: str, depth: int, include_counts: bool, as_json: bool) -> int:
|
||||||
|
from opcda_diagnozer.opc.browse import list_devices
|
||||||
|
|
||||||
|
try:
|
||||||
|
client = _connect_from_config(config_path)
|
||||||
|
browser = None
|
||||||
|
try:
|
||||||
|
browser = client.create_browser()
|
||||||
|
space = list_devices(browser, depth=depth, include_tag_counts=include_counts)
|
||||||
|
finally:
|
||||||
|
# Release the browser's COM reference *before* close() tears down the
|
||||||
|
# apartment — releasing an RCW after CoUninitialize crashes the process.
|
||||||
|
if browser is not None:
|
||||||
|
browser.close()
|
||||||
|
client.close()
|
||||||
|
except ConfigError as exc:
|
||||||
|
print(f"list-devices: FAILED\n {exc}", file=sys.stderr)
|
||||||
|
return 2
|
||||||
|
except (OpcError, ValueError) as exc:
|
||||||
|
print(f"list-devices: FAILED\n {exc}", file=sys.stderr)
|
||||||
|
return 2
|
||||||
|
_print_devices(space, as_json)
|
||||||
|
if not as_json and not space.devices:
|
||||||
|
hint = (
|
||||||
|
"hint: the server address space is flat — every tag hangs directly off "
|
||||||
|
"the root; use: opcda-diagnozer list-tags"
|
||||||
|
if space.organization == "flat"
|
||||||
|
else "hint: no branches at the root — the server may expose only tags; "
|
||||||
|
"try: opcda-diagnozer list-tags"
|
||||||
|
)
|
||||||
|
print(hint, file=sys.stderr)
|
||||||
|
return 0
|
||||||
|
|
||||||
|
|
||||||
|
def _print_tags(tags, device_path: tuple[str, ...], recursive: bool, as_json: bool) -> None:
|
||||||
|
"""Human table / JSON-lines output for the list-tags verb."""
|
||||||
|
where = ".".join(device_path) or "(server root)"
|
||||||
|
scope = " (recursive)" if recursive else ""
|
||||||
|
if as_json:
|
||||||
|
import json
|
||||||
|
|
||||||
|
for tag in tags:
|
||||||
|
payload = {
|
||||||
|
"name": tag.name,
|
||||||
|
"item_id": tag.item_id,
|
||||||
|
"path": list(tag.path),
|
||||||
|
}
|
||||||
|
print(json.dumps(payload, ensure_ascii=False))
|
||||||
|
return
|
||||||
|
if not tags:
|
||||||
|
print(f"no tags found under {where}{scope}")
|
||||||
|
return
|
||||||
|
print(f"tags under {where}{scope}: {len(tags)}")
|
||||||
|
width = max(len(t.item_id) for t in tags)
|
||||||
|
for tag in tags:
|
||||||
|
print(f" {tag.item_id:<{width}} (leaf: {tag.name})")
|
||||||
|
|
||||||
|
|
||||||
|
def _cmd_list_tags(
|
||||||
|
config_path: str,
|
||||||
|
device: Sequence[str],
|
||||||
|
recursive: bool,
|
||||||
|
as_json: bool,
|
||||||
|
) -> int:
|
||||||
|
from opcda_diagnozer.opc.browse import list_tags, split_device_path
|
||||||
|
|
||||||
|
# A single CLI argument is a *dotted* branch path; several arguments are
|
||||||
|
# explicit branch names (names may contain dots then).
|
||||||
|
device_arg = device[0] if len(device) == 1 else list(device)
|
||||||
|
try:
|
||||||
|
client = _connect_from_config(config_path)
|
||||||
|
browser = None
|
||||||
|
try:
|
||||||
|
browser = client.create_browser()
|
||||||
|
tags = list_tags(browser, device=device_arg or None, recursive=recursive)
|
||||||
|
finally:
|
||||||
|
if browser is not None:
|
||||||
|
browser.close()
|
||||||
|
client.close()
|
||||||
|
except ConfigError as exc:
|
||||||
|
print(f"list-tags: FAILED\n {exc}", file=sys.stderr)
|
||||||
|
return 2
|
||||||
|
except (OpcError, ValueError) as exc:
|
||||||
|
print(f"list-tags: FAILED\n {exc}", file=sys.stderr)
|
||||||
|
return 2
|
||||||
|
device_path = split_device_path(device_arg or None)
|
||||||
|
_print_tags(tags, device_path, recursive, as_json)
|
||||||
|
if not as_json and not tags and not recursive:
|
||||||
|
print(
|
||||||
|
"hint: the branch exists but exposes no direct leaves — try --recursive "
|
||||||
|
"to include the whole subtree",
|
||||||
|
file=sys.stderr,
|
||||||
|
)
|
||||||
|
return 0
|
||||||
|
|
||||||
|
|
||||||
|
def main(argv: Sequence[str] | None = None) -> int:
|
||||||
|
"""CLI entry point (console script + ``python -m opcda_diagnozer``)."""
|
||||||
|
args = _build_parser().parse_args(argv)
|
||||||
|
if args.verb == "check-config":
|
||||||
|
return _cmd_check_config(args.config)
|
||||||
|
if args.verb == "list-servers":
|
||||||
|
return _cmd_list_servers(args.host, args.source, args.json)
|
||||||
|
if args.verb == "list-devices":
|
||||||
|
return _cmd_list_devices(args.config, args.depth, not args.no_counts, args.json)
|
||||||
|
if args.verb == "list-tags":
|
||||||
|
return _cmd_list_tags(args.config, args.device, args.recursive, args.json)
|
||||||
|
phase = _NOT_IMPLEMENTED[args.verb]
|
||||||
|
print(
|
||||||
|
f"{args.verb}: not implemented yet — planned for {phase} "
|
||||||
|
"(see docs/IMPLEMENTATION_PLAN.md)",
|
||||||
|
file=sys.stderr,
|
||||||
|
)
|
||||||
|
return 1
|
||||||
|
|
||||||
|
|
||||||
|
if __name__ == "__main__":
|
||||||
|
raise SystemExit(main())
|
||||||
@@ -0,0 +1 @@
|
|||||||
|
"""Monitoring core: connection state machine, poller, detectors D1–D15."""
|
||||||
@@ -0,0 +1,24 @@
|
|||||||
|
"""Detector rules D1–D15 (SPECIFICATION §6).
|
||||||
|
|
||||||
|
Phase 1 (IMPLEMENTATION_PLAN §4.6): each detector becomes a small pure class
|
||||||
|
over :class:`PollOutcome` sequences with an injected clock; a rolling window
|
||||||
|
(deque, size ``window_polls``) powers p95/streak/flapping logic. Severity
|
||||||
|
mapping lives in SPECIFICATION §6.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from dataclasses import dataclass
|
||||||
|
from datetime import datetime
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import ReadResult
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class PollOutcome:
|
||||||
|
"""One completed poll cycle, as fed to the detectors."""
|
||||||
|
|
||||||
|
started_at: datetime # local receive time when the read call started (wall clock)
|
||||||
|
rtt_ms: float # measured round-trip time of the read call
|
||||||
|
results: tuple[ReadResult, ...] = () # per-tag results; empty if the call itself failed
|
||||||
|
error: str | None = None # normalized OpcError message when the whole poll failed (D1/D2/D7)
|
||||||
@@ -0,0 +1,25 @@
|
|||||||
|
"""The poll loop on the single dedicated COM thread (SPECIFICATION §10.3).
|
||||||
|
|
||||||
|
Phase 1 (IMPLEMENTATION_PLAN §4.7): connect → poll loop → feed detectors, plus
|
||||||
|
the hang watchdog (SPECIFICATION §10.4): a second thread timestamps poll
|
||||||
|
starts/ends; when a call exceeds ``hard_hang_s`` the stuck COM thread is
|
||||||
|
abandoned and a fresh connection is built on a new thread.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from opcda_diagnozer.config import Config
|
||||||
|
from opcda_diagnozer.opc.base import OpcClient
|
||||||
|
|
||||||
|
|
||||||
|
class Poller:
|
||||||
|
"""Drives one :class:`OpcClient` on its own thread — implemented in Phase 1."""
|
||||||
|
|
||||||
|
def __init__(self, client: OpcClient, config: Config) -> None:
|
||||||
|
self._client = client
|
||||||
|
self._config = config
|
||||||
|
|
||||||
|
def run_forever(self) -> None:
|
||||||
|
raise NotImplementedError(
|
||||||
|
"Phase 1: poller + hang watchdog (docs/IMPLEMENTATION_PLAN.md §4.7)"
|
||||||
|
)
|
||||||
@@ -0,0 +1,20 @@
|
|||||||
|
"""Connection state machine + reconnect backoff (SPECIFICATION §10.2).
|
||||||
|
|
||||||
|
States: Connecting → Connected → ReconnectWait → Connecting …
|
||||||
|
Backoff is exponential 1 s → 2 s → … capped at 60 s; every disconnect/reconnect
|
||||||
|
pair is an event (D1/D2) with the outage duration computed and reported.
|
||||||
|
|
||||||
|
The transition/backoff engine lands in Phase 1 (IMPLEMENTATION_PLAN §4.5).
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from enum import Enum
|
||||||
|
|
||||||
|
|
||||||
|
class ConnectionState(Enum):
|
||||||
|
"""States of the connection state machine (SPECIFICATION §10.2)."""
|
||||||
|
|
||||||
|
CONNECTING = "connecting"
|
||||||
|
CONNECTED = "connected"
|
||||||
|
RECONNECT_WAIT = "reconnect_wait"
|
||||||
@@ -0,0 +1 @@
|
|||||||
|
"""OPC DA client backends: shared protocol, Automation Wrapper adapter, fake."""
|
||||||
@@ -0,0 +1,222 @@
|
|||||||
|
"""OPC DA Automation Wrapper adapter (``OPCAutomation.dll``) — Phase 1.
|
||||||
|
|
||||||
|
The Automation Wrapper is a ubiquitous **32-bit in-proc** COM DLL: the Python
|
||||||
|
process must be 32-bit to load it (SPECIFICATION §11 — the Phase 0 bitness
|
||||||
|
decision). All COM work happens on one dedicated STA thread owned by the
|
||||||
|
poller (SPECIFICATION §10.3); COM exceptions map to :class:`OpcError` with the
|
||||||
|
``win32com`` scode (IMPLEMENTATION_PLAN §4.4).
|
||||||
|
|
||||||
|
pywin32 imports are deferred into the methods so this module stays importable
|
||||||
|
on any platform — tests run cross-OS with the fake client (plan §9).
|
||||||
|
|
||||||
|
Verified against the live ``OPC.Automation`` on this machine (2026-10-07,
|
||||||
|
Matrikon.OPC.Simulation.1): ``Connect(progId)`` / ``Connect(progId, node)``,
|
||||||
|
``CreateBrowser()`` returns a dispatch object with ``ShowBranches`` /
|
||||||
|
``ShowLeafs`` (sic) / ``Count`` / ``Item(i)`` (1-based) / ``GetItemID`` /
|
||||||
|
``MoveDown`` / ``MoveUp`` / ``MoveToRoot`` / ``MoveTo(list)`` /
|
||||||
|
``CurrentPosition``; ``Organization`` 1 = hierarchical, 2 = flat. Bad branch
|
||||||
|
names raise ``E_INVALIDARG``; ``MoveTo`` requires a *sequence* (a bare string
|
||||||
|
is a pywin32 SAFEARRAY ``TypeError``).
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from collections.abc import Sequence
|
||||||
|
from typing import Any
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import (
|
||||||
|
Browser,
|
||||||
|
OpcError,
|
||||||
|
ReadResult,
|
||||||
|
TagInfo,
|
||||||
|
as_com_error,
|
||||||
|
)
|
||||||
|
|
||||||
|
_NOT_IMPL = "Phase 1: Automation Wrapper adapter (docs/IMPLEMENTATION_PLAN.md §4.4)"
|
||||||
|
|
||||||
|
#: OPC_BROWSE organization constants (Automation Wrapper): 1 = hierarchical,
|
||||||
|
#: 2 = flat (tags addressed by bare ItemID, no branches to walk).
|
||||||
|
_ORGANIZATION_LABELS = {1: "hierarchical", 2: "flat"}
|
||||||
|
|
||||||
|
|
||||||
|
class _AutomationBrowser:
|
||||||
|
"""Thin, read-only :class:`Browser` over one wrapper browser object.
|
||||||
|
|
||||||
|
COM failures are re-raised as :class:`OpcError` with the raw HRESULT. The
|
||||||
|
underlying dispatch object is dropped in :meth:`close` **before**
|
||||||
|
``CoUninitialize`` — releasing an RCW after apartment teardown crashes the
|
||||||
|
process ("Win32 exception releasing IUnknown" / access violation).
|
||||||
|
"""
|
||||||
|
|
||||||
|
def __init__(self, raw_browser: Any) -> None:
|
||||||
|
self._browser = raw_browser
|
||||||
|
|
||||||
|
@property
|
||||||
|
def organization(self) -> str:
|
||||||
|
try:
|
||||||
|
raw = int(self._browser.Organization)
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
raise as_com_error("could not read the browser Organization property", exc) from None
|
||||||
|
return _ORGANIZATION_LABELS.get(raw, f"unknown ({raw})")
|
||||||
|
|
||||||
|
def _move_to(self, path: Sequence[str]) -> None:
|
||||||
|
"""Reposition the browser at ``path`` (root when empty)."""
|
||||||
|
try:
|
||||||
|
if path:
|
||||||
|
# A bare string is a pywin32 marshalling TypeError — always a list.
|
||||||
|
self._browser.MoveTo(list(path))
|
||||||
|
else:
|
||||||
|
self._browser.MoveToRoot()
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
dotted = ".".join(path)
|
||||||
|
raise as_com_error(
|
||||||
|
f"could not move the browser to {dotted or 'the root'} "
|
||||||
|
"(bad branch name?)",
|
||||||
|
exc,
|
||||||
|
) from None
|
||||||
|
|
||||||
|
def list_branches(self, path: Sequence[str] = ()) -> list[str]:
|
||||||
|
self._move_to(path)
|
||||||
|
try:
|
||||||
|
self._browser.ShowBranches()
|
||||||
|
count = int(self._browser.Count)
|
||||||
|
return [str(self._browser.Item(i)).strip() for i in range(1, count + 1)]
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
raise as_com_error(
|
||||||
|
f"could not enumerate branches under {'.'.join(path) or 'the root'}",
|
||||||
|
exc,
|
||||||
|
) from None
|
||||||
|
|
||||||
|
def list_leaves(self, path: Sequence[str] = ()) -> list[TagInfo]:
|
||||||
|
self._move_to(path)
|
||||||
|
try:
|
||||||
|
self._browser.ShowLeafs() # sic — the wrapper spells it "Leafs"
|
||||||
|
count = int(self._browser.Count)
|
||||||
|
leaves: list[TagInfo] = []
|
||||||
|
for i in range(1, count + 1):
|
||||||
|
name = str(self._browser.Item(i)).strip()
|
||||||
|
if not name:
|
||||||
|
continue
|
||||||
|
item_id = str(self._browser.GetItemID(name)).strip()
|
||||||
|
if not item_id:
|
||||||
|
# Some servers return an empty ItemID for filtered leaves;
|
||||||
|
# fall back to the browse name so config tags stay usable.
|
||||||
|
item_id = name
|
||||||
|
leaves.append(TagInfo(name=name, item_id=item_id, path=tuple(path)))
|
||||||
|
return leaves
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
raise as_com_error(
|
||||||
|
f"could not enumerate tags under {'.'.join(path) or 'the root'}",
|
||||||
|
exc,
|
||||||
|
) from None
|
||||||
|
|
||||||
|
def move_to(self, path: Sequence[str]) -> None:
|
||||||
|
self._move_to(path)
|
||||||
|
|
||||||
|
def close(self) -> None:
|
||||||
|
self._browser = None
|
||||||
|
|
||||||
|
|
||||||
|
class AutomationOpcClient:
|
||||||
|
"""``win32com``-based :class:`OpcClient`.
|
||||||
|
|
||||||
|
``connect`` / ``create_browser`` / ``close`` are live (they power the
|
||||||
|
``list-devices`` / ``list-tags`` validation verbs); ``read`` lands with the
|
||||||
|
Phase 1 core engine (IMPLEMENTATION_PLAN §4.4).
|
||||||
|
"""
|
||||||
|
|
||||||
|
def __init__(self, server: str, host: str | None = None, connect_timeout_s: float = 10.0) -> None:
|
||||||
|
self._server = server
|
||||||
|
self._host = host
|
||||||
|
self._connect_timeout_s = connect_timeout_s
|
||||||
|
self._com_initialized = False
|
||||||
|
self._opc: Any = None # the wrapper's dispatch object when connected
|
||||||
|
self._browsers: list[_AutomationBrowser] = [] # live browsers of this client
|
||||||
|
|
||||||
|
@staticmethod
|
||||||
|
def _require_pywin32() -> None:
|
||||||
|
try:
|
||||||
|
import pythoncom # noqa: F401 (import guard, Windows + pywin32 only)
|
||||||
|
except ImportError as exc:
|
||||||
|
raise OpcError(
|
||||||
|
"the Automation Wrapper backend requires pywin32 (Windows only); "
|
||||||
|
"install it into the 32-bit venv with: pip install pywin32"
|
||||||
|
) from exc
|
||||||
|
|
||||||
|
def connect(self) -> None:
|
||||||
|
self._require_pywin32()
|
||||||
|
import pythoncom
|
||||||
|
|
||||||
|
from win32com.client import Dispatch
|
||||||
|
|
||||||
|
try:
|
||||||
|
pythoncom.CoInitialize()
|
||||||
|
self._com_initialized = True
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
raise as_com_error("could not initialize COM on this thread", exc) from None
|
||||||
|
try:
|
||||||
|
try:
|
||||||
|
opc = Dispatch("OPC.Automation")
|
||||||
|
if self._host:
|
||||||
|
opc.Connect(self._server, self._host)
|
||||||
|
else:
|
||||||
|
opc.Connect(self._server)
|
||||||
|
self._opc = opc
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
where = f"host {self._host!r}" if self._host else "the local machine"
|
||||||
|
raise as_com_error(
|
||||||
|
f"could not connect to OPC DA server {self._server!r} on {where}",
|
||||||
|
exc,
|
||||||
|
) from None
|
||||||
|
except BaseException:
|
||||||
|
# The apartment must be torn down whenever the connection is not up.
|
||||||
|
self._release_and_uninit()
|
||||||
|
raise
|
||||||
|
|
||||||
|
def create_browser(self) -> Browser:
|
||||||
|
if self._opc is None:
|
||||||
|
raise OpcError("AutomationOpcClient: create_browser() before connect()")
|
||||||
|
try:
|
||||||
|
raw = self._opc.CreateBrowser()
|
||||||
|
except Exception as exc: # noqa: BLE001
|
||||||
|
raise as_com_error(
|
||||||
|
f"server {self._server!r} does not support browsing (CreateBrowser failed)",
|
||||||
|
exc,
|
||||||
|
) from None
|
||||||
|
browser = _AutomationBrowser(raw)
|
||||||
|
self._browsers.append(browser)
|
||||||
|
return browser
|
||||||
|
|
||||||
|
def _release_and_uninit(self) -> None:
|
||||||
|
"""Drop COM references **inside** the apartment, then CoUninitialize.
|
||||||
|
|
||||||
|
Live browsers created by this client are released first: releasing an
|
||||||
|
RCW after the apartment is torn down causes "Win32 exception releasing
|
||||||
|
IUnknown" / access violations at exit (observed: 0x80010108 fatal
|
||||||
|
exception under pytest).
|
||||||
|
"""
|
||||||
|
for browser in self._browsers:
|
||||||
|
browser.close()
|
||||||
|
self._browsers.clear()
|
||||||
|
if self._opc is not None:
|
||||||
|
try:
|
||||||
|
# Graceful server-side disconnect before dropping our references:
|
||||||
|
# the wrapper tears down its server connection (and the RPC
|
||||||
|
# channel) instead of the RPC runtime discovering the drop at
|
||||||
|
# CoUninitialize time.
|
||||||
|
self._opc.Disconnect()
|
||||||
|
except Exception: # noqa: BLE001 — best-effort teardown, never fatal
|
||||||
|
pass
|
||||||
|
self._opc = None
|
||||||
|
if self._com_initialized:
|
||||||
|
import pythoncom
|
||||||
|
|
||||||
|
self._com_initialized = False
|
||||||
|
pythoncom.CoUninitialize()
|
||||||
|
|
||||||
|
def read(self, tags: Sequence[str]) -> list[ReadResult]:
|
||||||
|
self._require_pywin32()
|
||||||
|
raise NotImplementedError(_NOT_IMPL)
|
||||||
|
|
||||||
|
def close(self) -> None:
|
||||||
|
self._release_and_uninit()
|
||||||
@@ -0,0 +1,164 @@
|
|||||||
|
"""OPC client abstraction (IMPLEMENTATION_PLAN §4.3).
|
||||||
|
|
||||||
|
Backends implement :class:`OpcClient` (Automation Wrapper, fake). COM errors
|
||||||
|
are normalized to :class:`OpcError` carrying the raw HRESULT and a decoded name.
|
||||||
|
There is deliberately **no write path** — the tool is read-only by construction
|
||||||
|
(SPECIFICATION §10.5).
|
||||||
|
|
||||||
|
Browsing (devices = branches, tags = leaves) is modelled by :class:`Browser`;
|
||||||
|
the ``list-devices`` / ``list-tags`` CLI verbs walk the address space through
|
||||||
|
it without any recursion into the monitored poll path.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from collections.abc import Sequence
|
||||||
|
from dataclasses import dataclass
|
||||||
|
from datetime import datetime
|
||||||
|
from typing import Any, Protocol, runtime_checkable
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class ReadResult:
|
||||||
|
"""One tag read: value, raw quality, device timestamp — or a per-tag error."""
|
||||||
|
|
||||||
|
tag: str
|
||||||
|
value: Any
|
||||||
|
quality_raw: int
|
||||||
|
device_time: datetime | None
|
||||||
|
error: str | None = None
|
||||||
|
|
||||||
|
|
||||||
|
# Common HRESULTs the tool decodes and reports (README "DCOM troubleshooting").
|
||||||
|
_HRESULT_NAMES: dict[int, str] = {
|
||||||
|
0x800706BA: "RPC_S_SERVER_UNAVAILABLE — server process down, firewall, or DCOM activation refused",
|
||||||
|
0x800706BE: "RPC_S_CALL_FAILED — server crashed or connection reset mid-flight",
|
||||||
|
0x80010108: "RPC_E_DISCONNECTED — OPC server dropped us (crash/restart)",
|
||||||
|
0x80070005: "E_ACCESSDENIED — DCOM security misconfiguration",
|
||||||
|
0x80040154: "REGDB_E_CLASSNOTREG — wrong ProgID, or wrapper/server registered under a different bitness",
|
||||||
|
0x80020009: "DISP_E_EXCEPTION — the server rejected the call (e.g. no such branch/tag)",
|
||||||
|
0x80070057: "E_INVALIDARG — invalid argument (e.g. wrong branch or item name)",
|
||||||
|
0xC0040007: "OPC_E_INVALIDITEMID — tag name wrong in config (surfaced by probe)",
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
def decode_hresult(hresult: int) -> str:
|
||||||
|
"""Explain a raw HRESULT in ops terms; unknown codes get a stable label."""
|
||||||
|
return _HRESULT_NAMES.get(hresult & 0xFFFFFFFF, "unrecognized HRESULT")
|
||||||
|
|
||||||
|
|
||||||
|
def as_com_error(message: str, exc: BaseException) -> OpcError:
|
||||||
|
"""Map a pywin32 error to :class:`OpcError`, keeping the raw HRESULT when present.
|
||||||
|
|
||||||
|
The source exception's traceback is **cleared** before it is discarded: a
|
||||||
|
propagating exception pins its frames — including locals holding raw COM
|
||||||
|
dispatch pointers (``CDispatch``) — until a later garbage collection. When
|
||||||
|
that GC runs after ``CoUninitialize`` the RCW release hits a dead apartment
|
||||||
|
and Windows prints "Win32 exception occurred releasing IUnknown" (observed
|
||||||
|
with the Automation Wrapper). Clearing the traceback keeps the HRESULT
|
||||||
|
(already extracted) while letting the RCWs die inside the apartment.
|
||||||
|
"""
|
||||||
|
hresult = getattr(exc, "hresult", None)
|
||||||
|
if hresult is None and getattr(exc, "args", None):
|
||||||
|
first = exc.args[0]
|
||||||
|
if isinstance(first, int):
|
||||||
|
hresult = first
|
||||||
|
exc.__traceback__ = None
|
||||||
|
return OpcError(message, hresult=hresult)
|
||||||
|
|
||||||
|
|
||||||
|
class OpcError(RuntimeError):
|
||||||
|
"""Normalized COM/OPC error; carries the raw HRESULT when available."""
|
||||||
|
|
||||||
|
def __init__(self, message: str, hresult: int | None = None) -> None:
|
||||||
|
super().__init__(message)
|
||||||
|
self.hresult = hresult
|
||||||
|
|
||||||
|
def __str__(self) -> str:
|
||||||
|
base = super().__str__()
|
||||||
|
if self.hresult is None:
|
||||||
|
return base
|
||||||
|
code = self.hresult & 0xFFFFFFFF
|
||||||
|
return f"{base} (HRESULT 0x{code:08X}: {decode_hresult(code)})"
|
||||||
|
|
||||||
|
|
||||||
|
#: Access rights mask bits (OPCEnum / Automation Wrapper OPC_ACCESS-rights).
|
||||||
|
#: The wrapper's ``AccessRights`` property combines READ (1) and WRITE (2);
|
||||||
|
#: this tool is read-only by construction and never sets a WRITE-only view.
|
||||||
|
ACCESS_READ = 0x01
|
||||||
|
ACCESS_WRITE = 0x02
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class DeviceInfo:
|
||||||
|
"""One browsable device: a branch in the server's hierarchical address space.
|
||||||
|
|
||||||
|
The Automation Wrapper exposes no per-branch metadata beyond the name, so a
|
||||||
|
"device" here is simply the branch path plus the counts the CLI prints.
|
||||||
|
"""
|
||||||
|
|
||||||
|
name: str
|
||||||
|
#: Branch path from the server root, e.g. ``("Simulation Items", "Bucket Brigade")``.
|
||||||
|
path: tuple[str, ...]
|
||||||
|
#: Sub-branches directly under this device (usually channels/groups).
|
||||||
|
sub_devices: tuple[str, ...] = ()
|
||||||
|
#: Leaf (tag) names directly under this device.
|
||||||
|
tag_names: tuple[str, ...] = ()
|
||||||
|
|
||||||
|
@property
|
||||||
|
def qualified_name(self) -> str:
|
||||||
|
"""Human-friendly dotted rendering: ``Simulation Items.Bucket Brigade``."""
|
||||||
|
return ".".join(self.path) if self.path else self.name
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class TagInfo:
|
||||||
|
"""One browsable tag (leaf): its ItemID is what goes into config ``tags:``."""
|
||||||
|
|
||||||
|
name: str
|
||||||
|
#: Fully qualified ItemID as accepted by read calls, e.g. ``Bucket Brigade.Int1``.
|
||||||
|
item_id: str
|
||||||
|
#: Branch path of the device the tag lives under; ``()`` for flat servers.
|
||||||
|
path: tuple[str, ...] = ()
|
||||||
|
|
||||||
|
|
||||||
|
@runtime_checkable
|
||||||
|
class Browser(Protocol):
|
||||||
|
"""Read-only traversal of a connected server's address space.
|
||||||
|
|
||||||
|
Mirrors the Automation Wrapper's ``IOPCBrowse`` surface (SPECIFICATION §8):
|
||||||
|
branches are devices/sub-devices, leaves are tags. Implementations walk on
|
||||||
|
demand; the browse verbs fetch one level at a time so a huge server never
|
||||||
|
stalls the CLI on an unbounded recursion.
|
||||||
|
"""
|
||||||
|
|
||||||
|
@property
|
||||||
|
def organization(self) -> str:
|
||||||
|
"""``"hierarchical"`` or ``"flat"`` (OPC_BROWSE constants)."""
|
||||||
|
...
|
||||||
|
|
||||||
|
def list_branches(self, path: Sequence[str] = ()) -> list[str]:
|
||||||
|
"""Sub-branch names directly under ``path`` (empty path = server root)."""
|
||||||
|
...
|
||||||
|
|
||||||
|
def list_leaves(self, path: Sequence[str] = ()) -> list[TagInfo]:
|
||||||
|
"""Tags directly under ``path``, with their fully qualified ItemIDs."""
|
||||||
|
...
|
||||||
|
|
||||||
|
def move_to(self, path: Sequence[str]) -> None:
|
||||||
|
"""Reposition at ``path`` (root when empty); raises OpcError when it does not exist."""
|
||||||
|
...
|
||||||
|
|
||||||
|
def close(self) -> None:
|
||||||
|
"""Release the underlying COM/browser resources (inside the apartment)."""
|
||||||
|
...
|
||||||
|
|
||||||
|
|
||||||
|
@runtime_checkable
|
||||||
|
class OpcClient(Protocol):
|
||||||
|
"""A read-only OPC DA client: connect → browse/read → close. No write path."""
|
||||||
|
|
||||||
|
def connect(self) -> None: ...
|
||||||
|
def create_browser(self) -> Browser: ...
|
||||||
|
def read(self, tags: Sequence[str]) -> list[ReadResult]: ...
|
||||||
|
def close(self) -> None: ...
|
||||||
@@ -0,0 +1,194 @@
|
|||||||
|
"""Browse the connected server's address space: devices (branches) and tags (leaves).
|
||||||
|
|
||||||
|
OPC DA has no formal "device" concept — servers publish a *hierarchical
|
||||||
|
address space* whose top-level branches almost always represent devices (or
|
||||||
|
device families), with tags as the leaves. This module maps that tree onto the
|
||||||
|
two questions ops asks (SPECIFICATION §8, validation tooling):
|
||||||
|
|
||||||
|
- *Which devices does this server expose?* → :func:`list_devices`
|
||||||
|
- *Which tags does device X expose?* → :func:`list_tags`
|
||||||
|
|
||||||
|
The Automation Wrapper browser (``opc.CreateBrowser()``) is the only portable
|
||||||
|
traversal API — it works over DCOM for remote servers too, with the same
|
||||||
|
Launch+Activation requirements as ``list-servers``. Traversal is one level at
|
||||||
|
a time; the ``max_depth`` guard keeps a pathological (cyclic/AB-tree) server
|
||||||
|
from stalling the CLI.
|
||||||
|
|
||||||
|
Flat-namespace servers report ``organization == "flat"``; there every leaf is
|
||||||
|
addressed by its bare ItemID, the root is treated as one implicit device.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from collections.abc import Sequence
|
||||||
|
from dataclasses import dataclass
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import Browser, DeviceInfo, OpcError, TagInfo
|
||||||
|
|
||||||
|
#: Walk guard: deep SCADA hierarchies exist (Channel → Device → Tag), but OPC
|
||||||
|
#: trees deeper than this are almost certainly a server-side loop.
|
||||||
|
MAX_DEPTH = 32
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class Space:
|
||||||
|
"""Result of a device-space walk: one entry per discovered branch node."""
|
||||||
|
|
||||||
|
organization: str
|
||||||
|
root: DeviceInfo
|
||||||
|
devices: tuple[DeviceInfo, ...]
|
||||||
|
|
||||||
|
|
||||||
|
def split_device_path(path: Sequence[str] | str | None) -> tuple[str, ...]:
|
||||||
|
"""Normalize a user-supplied device path into branch segments.
|
||||||
|
|
||||||
|
A **single** string is treated as dotted: ``"Simulation Items.Bucket Brigade"``
|
||||||
|
→ ``("Simulation Items", "Bucket Brigade")``. **Multiple** segments are
|
||||||
|
taken as explicit branch names — no dot splitting, so names that contain
|
||||||
|
a dot stay intact (they just have to be passed as separate arguments).
|
||||||
|
Empty segments and whitespace are dropped.
|
||||||
|
"""
|
||||||
|
if path is None:
|
||||||
|
return ()
|
||||||
|
if isinstance(path, str):
|
||||||
|
segments: list[str] = [p.strip() for p in path.split(".")]
|
||||||
|
return tuple(p for p in segments if p)
|
||||||
|
parts: list[str] = []
|
||||||
|
for segment in path:
|
||||||
|
piece = str(segment).strip()
|
||||||
|
if piece:
|
||||||
|
parts.append(piece)
|
||||||
|
return tuple(parts)
|
||||||
|
|
||||||
|
|
||||||
|
def list_devices(
|
||||||
|
browser: Browser,
|
||||||
|
*,
|
||||||
|
depth: int = 1,
|
||||||
|
include_tag_counts: bool = True,
|
||||||
|
) -> Space:
|
||||||
|
"""Enumerate devices (branches) starting at the server root.
|
||||||
|
|
||||||
|
``depth=1`` lists top-level branches (the typical "device list"); greater
|
||||||
|
depths reveal sub-devices (channels/groups). Each :class:`DeviceInfo`
|
||||||
|
carries the direct sub-branches and — when ``include_tag_counts`` is on —
|
||||||
|
the leaf names under it, so the CLI can print ``Device (3 tags, 2 sub)``.
|
||||||
|
|
||||||
|
Raises :class:`OpcError` when the server rejects the walk (COM failure or
|
||||||
|
unsupported browse interface). The walk is bounded by ``depth`` (≤
|
||||||
|
:data:`MAX_DEPTH`), so a pathological server can never stall the CLI.
|
||||||
|
"""
|
||||||
|
if depth < 1:
|
||||||
|
raise ValueError("depth must be >= 1")
|
||||||
|
if depth > MAX_DEPTH:
|
||||||
|
raise ValueError(f"depth must be <= {MAX_DEPTH}")
|
||||||
|
organization = browser.organization
|
||||||
|
root_branches = browser.list_branches(())
|
||||||
|
root_leaves = browser.list_leaves(()) if include_tag_counts else []
|
||||||
|
root = DeviceInfo(
|
||||||
|
name="(root)",
|
||||||
|
path=(),
|
||||||
|
sub_devices=tuple(root_branches),
|
||||||
|
tag_names=tuple(t.name for t in root_leaves),
|
||||||
|
)
|
||||||
|
devices: list[DeviceInfo] = []
|
||||||
|
_walk_level(browser, (), root_branches, depth, devices, include_tag_counts)
|
||||||
|
return Space(organization=organization, root=root, devices=tuple(devices))
|
||||||
|
|
||||||
|
|
||||||
|
def _walk_level(
|
||||||
|
browser: Browser,
|
||||||
|
path: tuple[str, ...],
|
||||||
|
branches: Sequence[str],
|
||||||
|
depth: int,
|
||||||
|
devices: list[DeviceInfo],
|
||||||
|
include_tag_counts: bool,
|
||||||
|
) -> None:
|
||||||
|
if depth <= 0:
|
||||||
|
return
|
||||||
|
for branch in branches:
|
||||||
|
sub_path = path + (branch,)
|
||||||
|
sub_branches = tuple(browser.list_branches(sub_path))
|
||||||
|
tag_names = (
|
||||||
|
tuple(t.name for t in browser.list_leaves(sub_path))
|
||||||
|
if include_tag_counts
|
||||||
|
else ()
|
||||||
|
)
|
||||||
|
devices.append(
|
||||||
|
DeviceInfo(
|
||||||
|
name=branch,
|
||||||
|
path=sub_path,
|
||||||
|
sub_devices=sub_branches,
|
||||||
|
tag_names=tag_names,
|
||||||
|
)
|
||||||
|
)
|
||||||
|
_walk_level(browser, sub_path, sub_branches, depth - 1, devices, include_tag_counts)
|
||||||
|
|
||||||
|
|
||||||
|
def list_tags(
|
||||||
|
browser: Browser,
|
||||||
|
device: str | Sequence[str] | None = None,
|
||||||
|
*,
|
||||||
|
recursive: bool = False,
|
||||||
|
) -> list[TagInfo]:
|
||||||
|
"""List the tags of one device (branch), or of the whole server.
|
||||||
|
|
||||||
|
``device`` accepts either a dotted string (``"Simulation Items.Bucket
|
||||||
|
Brigade"``) or a pre-split sequence of branch names. ``None`` means the
|
||||||
|
server root; with ``recursive=True`` every leaf under it is returned
|
||||||
|
(bounded by :data:`MAX_DEPTH`). The returned :class:`TagInfo.item_id`
|
||||||
|
values are exactly what goes into the config ``tags:`` list. An unknown
|
||||||
|
device path raises :class:`OpcError` pointing at ``list-devices``.
|
||||||
|
"""
|
||||||
|
path = _require_device(browser, device, what="list-tags")
|
||||||
|
leaves = browser.list_leaves(path)
|
||||||
|
tags: list[TagInfo] = list(leaves)
|
||||||
|
if not recursive:
|
||||||
|
return sorted(tags, key=lambda t: t.item_id.lower())
|
||||||
|
sub_branches = browser.list_branches(path)
|
||||||
|
_collect_recursive(browser, path, sub_branches, tags)
|
||||||
|
return sorted(tags, key=lambda t: t.item_id.lower())
|
||||||
|
|
||||||
|
|
||||||
|
def _collect_recursive(
|
||||||
|
browser: Browser,
|
||||||
|
path: tuple[str, ...],
|
||||||
|
branches: Sequence[str],
|
||||||
|
tags: list[TagInfo],
|
||||||
|
) -> None:
|
||||||
|
for branch in branches:
|
||||||
|
sub_path = path + (branch,)
|
||||||
|
if len(sub_path) > MAX_DEPTH:
|
||||||
|
raise OpcError(
|
||||||
|
f"address space deeper than {MAX_DEPTH} levels at "
|
||||||
|
f"{'.'.join(sub_path)} — refusing to walk further (possible "
|
||||||
|
"server-side cycle)"
|
||||||
|
)
|
||||||
|
tags.extend(browser.list_leaves(sub_path))
|
||||||
|
_collect_recursive(browser, sub_path, browser.list_branches(sub_path), tags)
|
||||||
|
|
||||||
|
|
||||||
|
def _require_device(
|
||||||
|
browser: Browser,
|
||||||
|
device: str | Sequence[str] | None,
|
||||||
|
*,
|
||||||
|
what: str,
|
||||||
|
) -> tuple[str, ...]:
|
||||||
|
"""Resolve and validate a user-supplied device path (exists, is a branch)."""
|
||||||
|
path = split_device_path(device)
|
||||||
|
if not path:
|
||||||
|
return ()
|
||||||
|
siblings = browser.list_branches(path[:-1])
|
||||||
|
if path[-1] not in siblings:
|
||||||
|
raise OpcError(
|
||||||
|
f"{what}: device {path[-1]!r} not found under "
|
||||||
|
f"{'.'.join(path[:-1]) or '(root)'} — run list-devices to see the "
|
||||||
|
"available branches"
|
||||||
|
)
|
||||||
|
return path
|
||||||
|
|
||||||
|
|
||||||
|
def tags_for_device(browser: Browser, device: str | Sequence[str]) -> list[TagInfo]:
|
||||||
|
"""List tags of a **known** device path — validation helper (probe)."""
|
||||||
|
path = _require_device(browser, device, what="list-tags")
|
||||||
|
return sorted(browser.list_leaves(path), key=lambda t: t.item_id.lower())
|
||||||
@@ -0,0 +1,224 @@
|
|||||||
|
"""Enumerate the OPC DA servers available to this process (local, or via DCOM).
|
||||||
|
|
||||||
|
Two mechanisms, matching how OPC DA discovery actually works on Windows:
|
||||||
|
|
||||||
|
- ``automation`` — the OPC DA Automation Wrapper (``OPC.Automation``, i.e.
|
||||||
|
``OPCAutomation.dll``). ``GetOPCServers(node)`` returns the ProgIDs the host
|
||||||
|
publishes through the COM component categories; with a node name it
|
||||||
|
enumerates a remote host over DCOM (requires Launch+Activation permissions,
|
||||||
|
SPECIFICATION §11). Needs COM initialized; a 32-bit interpreter sees the
|
||||||
|
32-bit registrations — the same servers this tool can load.
|
||||||
|
- ``registry`` — a direct COM-registration scan of
|
||||||
|
``HKCR\\CLSID\\{...}\\Implemented Categories`` for the OPC DA component
|
||||||
|
categories. Local only, needs no COM at all — the fallback for locked-down
|
||||||
|
hosts or boxes where the wrapper DLL is not registered.
|
||||||
|
|
||||||
|
OPC Foundation DA component categories (verified):
|
||||||
|
DA 1.0 ``{63D5F430-CFE4-11D1-B2C8-0060083BA1FB}``
|
||||||
|
DA 2.0 ``{63D5F432-CFE4-11D1-B2C8-0060083BA1FB}``
|
||||||
|
DA 3.0 ``{CC603E42-48D7-4E57-A010-7563B3B0A715}``
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
import sys
|
||||||
|
from collections.abc import Iterator
|
||||||
|
from contextlib import contextmanager
|
||||||
|
from dataclasses import dataclass
|
||||||
|
from typing import Any, Literal
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import OpcError, as_com_error
|
||||||
|
|
||||||
|
AUTOMATION_PROG_ID = "OPC.Automation" # OPC DA Automation Wrapper (OPCAutomation.dll)
|
||||||
|
|
||||||
|
#: Component-category CATID -> human label (OPC Foundation).
|
||||||
|
DA_CATEGORIES: dict[str, str] = {
|
||||||
|
"{63D5F430-CFE4-11D1-B2C8-0060083BA1FB}": "DA 1.0",
|
||||||
|
"{63D5F432-CFE4-11D1-B2C8-0060083BA1FB}": "DA 2.0",
|
||||||
|
"{CC603E42-48D7-4E57-A010-7563B3B0A715}": "DA 3.0",
|
||||||
|
}
|
||||||
|
|
||||||
|
Source = Literal["auto", "automation", "registry"]
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class ServerInfo:
|
||||||
|
"""One discoverable OPC DA server."""
|
||||||
|
|
||||||
|
prog_id: str
|
||||||
|
source: Literal["automation", "registry"]
|
||||||
|
clsid: str | None = None
|
||||||
|
description: str | None = None
|
||||||
|
da_versions: tuple[str, ...] = ()
|
||||||
|
|
||||||
|
|
||||||
|
def normalize_string_array(raw: Any) -> list[str]:
|
||||||
|
"""Coerce a COM VARIANT result (tuple of str / str / None) to a clean str list."""
|
||||||
|
if raw is None:
|
||||||
|
items: tuple[Any, ...] = ()
|
||||||
|
elif isinstance(raw, str):
|
||||||
|
items = (raw,)
|
||||||
|
elif isinstance(raw, (list, tuple)):
|
||||||
|
items = tuple(raw)
|
||||||
|
elif hasattr(raw, "__iter__"):
|
||||||
|
items = tuple(raw)
|
||||||
|
else:
|
||||||
|
items = ()
|
||||||
|
cleaned = [item.strip() for item in items if isinstance(item, str) and item.strip()]
|
||||||
|
seen: set[str] = set()
|
||||||
|
deduped: list[str] = []
|
||||||
|
for item in cleaned:
|
||||||
|
if item not in seen:
|
||||||
|
seen.add(item)
|
||||||
|
deduped.append(item)
|
||||||
|
return deduped
|
||||||
|
|
||||||
|
|
||||||
|
@contextmanager
|
||||||
|
def _com_apartment() -> Iterator[None]:
|
||||||
|
"""Initialize COM for the duration of the enumeration (SPECIFICATION §10.3).
|
||||||
|
|
||||||
|
Enumeration runs on the CLI thread, not the future poller's dedicated COM
|
||||||
|
thread, so it initializes/uninitializes its own apartment here.
|
||||||
|
"""
|
||||||
|
import pythoncom
|
||||||
|
|
||||||
|
pythoncom.CoInitialize()
|
||||||
|
try:
|
||||||
|
yield
|
||||||
|
finally:
|
||||||
|
pythoncom.CoUninitialize()
|
||||||
|
|
||||||
|
|
||||||
|
def _via_automation(host: str | None) -> list[ServerInfo]:
|
||||||
|
"""Enumerate via the Automation Wrapper — local machine, or remote via DCOM."""
|
||||||
|
try:
|
||||||
|
import pywintypes
|
||||||
|
from win32com.client import Dispatch
|
||||||
|
except ImportError as exc:
|
||||||
|
raise OpcError(
|
||||||
|
"the Automation Wrapper source requires pywin32 (Windows only); "
|
||||||
|
"install it into the 32-bit venv with: pip install pywin32"
|
||||||
|
) from exc
|
||||||
|
where = f"host {host!r}" if host else "the local machine"
|
||||||
|
with _com_apartment():
|
||||||
|
try:
|
||||||
|
opc = Dispatch(AUTOMATION_PROG_ID)
|
||||||
|
try:
|
||||||
|
raw = opc.GetOPCServers(host) if host else opc.GetOPCServers()
|
||||||
|
# Marshal everything to plain Python data and release the COM
|
||||||
|
# reference *inside* the apartment: releasing an IUnknown after
|
||||||
|
# CoUninitialize crashes (observed: "Win32 exception releasing
|
||||||
|
# IUnknown" / access violation at interpreter shutdown).
|
||||||
|
prog_ids = normalize_string_array(raw)
|
||||||
|
finally:
|
||||||
|
opc = None # drop the COM reference while COM is still initialized
|
||||||
|
except pywintypes.com_error as exc:
|
||||||
|
raise as_com_error(
|
||||||
|
f"could not enumerate OPC DA servers on {where} via the "
|
||||||
|
"Automation Wrapper (is OPCAutomation.dll registered?)",
|
||||||
|
exc,
|
||||||
|
) from None
|
||||||
|
except AttributeError as exc:
|
||||||
|
raise OpcError(
|
||||||
|
"the registered Automation Wrapper does not expose "
|
||||||
|
f"GetOPCServers ({exc}); try --source registry"
|
||||||
|
) from None
|
||||||
|
servers = [ServerInfo(prog_id=prog, source="automation") for prog in prog_ids]
|
||||||
|
return sorted(servers, key=lambda s: s.prog_id.lower())
|
||||||
|
|
||||||
|
|
||||||
|
def _registry_value(root: Any, subkey: str) -> str | None:
|
||||||
|
"""Default string value of ``root\\subkey``; None when absent/not a string."""
|
||||||
|
import winreg
|
||||||
|
|
||||||
|
try:
|
||||||
|
with winreg.OpenKey(root, subkey) as key:
|
||||||
|
value, _ = winreg.QueryValueEx(key, "")
|
||||||
|
except OSError:
|
||||||
|
return None
|
||||||
|
return value if isinstance(value, str) else None
|
||||||
|
|
||||||
|
|
||||||
|
def _implemented_da_categories(root: Any, clsid: str) -> tuple[str, ...]:
|
||||||
|
"""DA versions a CLSID implements, from its Implemented Categories key."""
|
||||||
|
import winreg
|
||||||
|
|
||||||
|
found: list[str] = []
|
||||||
|
try:
|
||||||
|
with winreg.OpenKey(root, f"{clsid}\\Implemented Categories") as cats:
|
||||||
|
index = 0
|
||||||
|
while True:
|
||||||
|
try:
|
||||||
|
category = winreg.EnumKey(cats, index)
|
||||||
|
except OSError:
|
||||||
|
break
|
||||||
|
index += 1
|
||||||
|
label = DA_CATEGORIES.get(category)
|
||||||
|
if label is not None:
|
||||||
|
found.append(label)
|
||||||
|
except OSError:
|
||||||
|
pass # no Implemented Categories subkey -> not an OPC DA server
|
||||||
|
return tuple(sorted(found))
|
||||||
|
|
||||||
|
|
||||||
|
def _via_registry(host: str | None) -> list[ServerInfo]:
|
||||||
|
"""Scan COM registrations for DA component categories — local, no COM needed.
|
||||||
|
|
||||||
|
A 32-bit process sees the 32-bit registry view, which is exactly the set
|
||||||
|
of servers loadable by this (32-bit) tool (SPECIFICATION §11).
|
||||||
|
"""
|
||||||
|
if host is not None:
|
||||||
|
raise OpcError(
|
||||||
|
"the registry source only enumerates the local machine; "
|
||||||
|
"remote enumeration requires the Automation wrapper over DCOM "
|
||||||
|
"(use --source auto or --source automation with --host)"
|
||||||
|
)
|
||||||
|
if sys.platform != "win32":
|
||||||
|
raise OpcError("the registry source requires Windows")
|
||||||
|
import winreg
|
||||||
|
|
||||||
|
servers: list[ServerInfo] = []
|
||||||
|
with winreg.OpenKey(winreg.HKEY_CLASSES_ROOT, "CLSID") as root:
|
||||||
|
index = 0
|
||||||
|
while True:
|
||||||
|
try:
|
||||||
|
clsid = winreg.EnumKey(root, index)
|
||||||
|
except OSError:
|
||||||
|
break
|
||||||
|
index += 1
|
||||||
|
if not (clsid.startswith("{") and clsid.endswith("}")):
|
||||||
|
continue
|
||||||
|
da_versions = _implemented_da_categories(root, clsid)
|
||||||
|
if not da_versions:
|
||||||
|
continue
|
||||||
|
prog_id = _registry_value(root, f"{clsid}\\ProgID")
|
||||||
|
servers.append(
|
||||||
|
ServerInfo(
|
||||||
|
prog_id=prog_id or clsid,
|
||||||
|
source="registry",
|
||||||
|
clsid=clsid,
|
||||||
|
description=_registry_value(root, clsid),
|
||||||
|
da_versions=da_versions,
|
||||||
|
)
|
||||||
|
)
|
||||||
|
return sorted(servers, key=lambda s: s.prog_id.lower())
|
||||||
|
|
||||||
|
|
||||||
|
def list_servers(host: str | None = None, source: Source = "auto") -> list[ServerInfo]:
|
||||||
|
"""Enumerate available OPC DA servers (see module docstring for mechanisms).
|
||||||
|
|
||||||
|
``auto`` tries the Automation Wrapper first and falls back to the registry
|
||||||
|
scan when COM enumeration fails on the local machine; with a remote
|
||||||
|
``host`` only the Automation Wrapper can be used, so its error propagates.
|
||||||
|
"""
|
||||||
|
if source not in ("auto", "automation", "registry"):
|
||||||
|
raise ValueError(f"unknown source {source!r}")
|
||||||
|
if source in ("auto", "automation"):
|
||||||
|
try:
|
||||||
|
return _via_automation(host)
|
||||||
|
except OpcError:
|
||||||
|
if source == "automation" or host is not None:
|
||||||
|
raise
|
||||||
|
# local auto: fall back to the COM-registration scan
|
||||||
|
return _via_registry(host)
|
||||||
@@ -0,0 +1,130 @@
|
|||||||
|
"""Scriptable in-process fake OPC client — tests and demo without COM/hardware.
|
||||||
|
|
||||||
|
Phase 1 (IMPLEMENTATION_PLAN §4.9) turns this into the scenario engine
|
||||||
|
(scripted sequences of good reads, errors, hangs, quality flips) that powers
|
||||||
|
the entire unit-test suite. This placeholder always reads GOOD-quality zeros
|
||||||
|
so the skeleton's smoke tests have something deterministic to assert on.
|
||||||
|
|
||||||
|
The fake carries a small **hierarchical address space** (Matrikon-like:
|
||||||
|
``Simulation Items → Bucket Brigade → Int1…``) so the browse verbs
|
||||||
|
(``list-devices`` / ``list-tags``) and their tests run cross-OS without COM.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from collections.abc import Sequence
|
||||||
|
from datetime import datetime, timezone
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import Browser, OpcError, ReadResult, TagInfo
|
||||||
|
|
||||||
|
#: The fake address space: branch path -> (sub-branches, leaf names).
|
||||||
|
#: Mirrors the shape of a real SCADA server (Channel → Device → Tags).
|
||||||
|
FAKE_SPACE: dict[tuple[str, ...], tuple[tuple[str, ...], tuple[str, ...]]] = {
|
||||||
|
(): (("Simulation Items", "Configured Aliases"), ("#MonitorACLFile", "@ClientCount", "@Clients")),
|
||||||
|
("Simulation Items",): (
|
||||||
|
(
|
||||||
|
"Bucket Brigade",
|
||||||
|
"Random",
|
||||||
|
"Read Error",
|
||||||
|
"Saw-toothed Waves",
|
||||||
|
"Square Waves",
|
||||||
|
"Triangle Waves",
|
||||||
|
"Write Error",
|
||||||
|
"Write Only",
|
||||||
|
),
|
||||||
|
(),
|
||||||
|
),
|
||||||
|
("Simulation Items", "Bucket Brigade"): (
|
||||||
|
(),
|
||||||
|
("Int1", "Int2", "Int4", "Real4", "Real8", "String", "Boolean"),
|
||||||
|
),
|
||||||
|
("Simulation Items", "Random"): ((), ("Int1", "Int4", "Money", "Time")),
|
||||||
|
("Simulation Items", "Read Error"): ((), ("Int1", "Int4")),
|
||||||
|
("Simulation Items", "Saw-toothed Waves"): ((), ("Int1", "Real8")),
|
||||||
|
("Simulation Items", "Square Waves"): ((), ("Int1", "Real8")),
|
||||||
|
("Simulation Items", "Triangle Waves"): ((), ("Int1", "Real8")),
|
||||||
|
("Simulation Items", "Write Error"): ((), ("Int1", "Int4")),
|
||||||
|
("Simulation Items", "Write Only"): ((), ("Int1", "Int4")),
|
||||||
|
("Configured Aliases",): ((), ("Alias1", "Alias2")),
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
def _item_id(path: tuple[str, ...], leaf: str) -> str:
|
||||||
|
"""Fully qualified ItemID, mirroring the verified Matrikon sim convention:
|
||||||
|
|
||||||
|
the immediate branch + leaf (``Bucket Brigade.Int1`` even though the branch
|
||||||
|
is nested under ``Simulation Items``); bare leaf at the root. This is what
|
||||||
|
the real server's ``GetItemID`` returns for the same tree.
|
||||||
|
"""
|
||||||
|
return f"{path[-1]}.{leaf}" if path else leaf
|
||||||
|
|
||||||
|
|
||||||
|
class _FakeBrowser:
|
||||||
|
"""In-process :class:`Browser` over a fake space — pure data, no COM."""
|
||||||
|
|
||||||
|
def __init__(self, space: dict[tuple[str, ...], tuple[tuple[str, ...], tuple[str, ...]]]) -> None:
|
||||||
|
self._space = space
|
||||||
|
|
||||||
|
@property
|
||||||
|
def organization(self) -> str:
|
||||||
|
return "hierarchical" if self._space.get(()) and self._space[()][0] else "flat"
|
||||||
|
|
||||||
|
def list_branches(self, path: Sequence[str] = ()) -> list[str]:
|
||||||
|
key = tuple(path)
|
||||||
|
entry = self._space.get(key)
|
||||||
|
if entry is None:
|
||||||
|
raise OpcError(f"no such branch: {'.'.join(key) or '(root)'}")
|
||||||
|
return list(entry[0])
|
||||||
|
|
||||||
|
def list_leaves(self, path: Sequence[str] = ()) -> list[TagInfo]:
|
||||||
|
key = tuple(path)
|
||||||
|
entry = self._space.get(key)
|
||||||
|
if entry is None:
|
||||||
|
raise OpcError(f"no such branch: {'.'.join(key) or '(root)'}")
|
||||||
|
return [
|
||||||
|
TagInfo(name=leaf, item_id=_item_id(key, leaf), path=key)
|
||||||
|
for leaf in entry[1]
|
||||||
|
]
|
||||||
|
|
||||||
|
def move_to(self, path: Sequence[str]) -> None:
|
||||||
|
key = tuple(path)
|
||||||
|
if key and key not in self._space:
|
||||||
|
raise OpcError(f"no such branch: {'.'.join(key)}")
|
||||||
|
|
||||||
|
def close(self) -> None:
|
||||||
|
self._space = {}
|
||||||
|
|
||||||
|
|
||||||
|
class FakeOpcClient:
|
||||||
|
"""In-process :class:`OpcClient`; every read returns GOOD-quality zeros.
|
||||||
|
|
||||||
|
``space`` is injectable so tests can exercise flat namespaces, empty
|
||||||
|
servers, and deep trees; the default mirrors a Matrikon-like hierarchy.
|
||||||
|
"""
|
||||||
|
|
||||||
|
def __init__(
|
||||||
|
self,
|
||||||
|
space: dict[tuple[str, ...], tuple[tuple[str, ...], tuple[str, ...]]] | None = None,
|
||||||
|
) -> None:
|
||||||
|
self.connected = False
|
||||||
|
self._space = FAKE_SPACE if space is None else space
|
||||||
|
|
||||||
|
def connect(self) -> None:
|
||||||
|
self.connected = True
|
||||||
|
|
||||||
|
def create_browser(self) -> Browser:
|
||||||
|
if not self.connected:
|
||||||
|
raise OpcError("FakeOpcClient: create_browser() before connect()")
|
||||||
|
return _FakeBrowser(self._space)
|
||||||
|
|
||||||
|
def read(self, tags: Sequence[str]) -> list[ReadResult]:
|
||||||
|
if not self.connected:
|
||||||
|
raise OpcError("FakeOpcClient: read() before connect()")
|
||||||
|
now = datetime.now(timezone.utc)
|
||||||
|
return [
|
||||||
|
ReadResult(tag=tag, value=0, quality_raw=0xC0, device_time=now)
|
||||||
|
for tag in tags
|
||||||
|
]
|
||||||
|
|
||||||
|
def close(self) -> None:
|
||||||
|
self.connected = False
|
||||||
@@ -0,0 +1,69 @@
|
|||||||
|
"""OPC DA quality decode tables (SPECIFICATION §7).
|
||||||
|
|
||||||
|
Quality is a 16-bit field: bits 7–6 of the low byte give the class
|
||||||
|
(0xC0 GOOD / 0x40 UNCERTAIN / 0x00 BAD); bits 5–0 are the substatus. Every
|
||||||
|
quality event must carry the raw hex code **and** the decoded name.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from dataclasses import dataclass
|
||||||
|
from enum import Enum
|
||||||
|
|
||||||
|
|
||||||
|
class QualityClass(str, Enum):
|
||||||
|
GOOD = "GOOD"
|
||||||
|
UNCERTAIN = "UNCERTAIN"
|
||||||
|
BAD = "BAD"
|
||||||
|
|
||||||
|
|
||||||
|
@dataclass(frozen=True)
|
||||||
|
class QualityInfo:
|
||||||
|
"""Decoded quality for one read (SPECIFICATION §7)."""
|
||||||
|
|
||||||
|
raw: int
|
||||||
|
name: str
|
||||||
|
quality_class: QualityClass
|
||||||
|
|
||||||
|
@property
|
||||||
|
def raw_hex(self) -> str:
|
||||||
|
"""Raw code formatted for events, e.g. ``0x18``."""
|
||||||
|
return f"0x{self.raw & 0xFF:02X}"
|
||||||
|
|
||||||
|
|
||||||
|
# Codes from SPECIFICATION §7.
|
||||||
|
# TODO(Phase 1): complete the remaining DA 2.05a UNCERTAIN subcodes in this
|
||||||
|
# table — they decode by the same scheme (spec §7 closing note).
|
||||||
|
_QUALITY_NAMES: dict[int, str] = {
|
||||||
|
0xC0: "GOOD",
|
||||||
|
0xD8: "GOOD_LOCAL_OVERRIDE",
|
||||||
|
0x40: "UNCERTAIN",
|
||||||
|
0x44: "UNCERTAIN_LAST_USABLE",
|
||||||
|
0x00: "BAD",
|
||||||
|
0x04: "BAD_CONFIG_ERROR",
|
||||||
|
0x08: "BAD_NOT_CONNECTED",
|
||||||
|
0x0C: "BAD_DEVICE_FAILURE",
|
||||||
|
0x10: "BAD_SENSOR_FAILURE",
|
||||||
|
0x14: "BAD_LAST_KNOWN_VALUE",
|
||||||
|
0x18: "BAD_COMM_FAILURE",
|
||||||
|
0x1C: "BAD_OUT_OF_SERVICE",
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
def _class_of(low: int) -> QualityClass:
|
||||||
|
"""Class comes from bits 7–6 of the low byte."""
|
||||||
|
bits = low & 0xC0
|
||||||
|
if bits == 0xC0:
|
||||||
|
return QualityClass.GOOD
|
||||||
|
if bits == 0x40:
|
||||||
|
return QualityClass.UNCERTAIN
|
||||||
|
return QualityClass.BAD
|
||||||
|
|
||||||
|
|
||||||
|
def decode_quality(raw: int) -> QualityInfo:
|
||||||
|
"""Decode a raw OPC DA quality word into a named :class:`QualityInfo`."""
|
||||||
|
low = raw & 0xFF
|
||||||
|
name = _QUALITY_NAMES.get(low)
|
||||||
|
if name is None:
|
||||||
|
name = f"{_class_of(low).value}_0x{low:02X}"
|
||||||
|
return QualityInfo(raw=raw, name=name, quality_class=_class_of(low))
|
||||||
@@ -0,0 +1 @@
|
|||||||
|
"""Event reporters: JSONL file, Windows Event Log, optional HTTP webhook."""
|
||||||
@@ -0,0 +1,13 @@
|
|||||||
|
"""Reporter protocol — pluggable event sinks (SPECIFICATION §9)."""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from typing import Protocol
|
||||||
|
|
||||||
|
from opcda_diagnozer.events import DiagEvent
|
||||||
|
|
||||||
|
|
||||||
|
class Reporter(Protocol):
|
||||||
|
"""Anything that can receive events; reporting never blocks the poll loop."""
|
||||||
|
|
||||||
|
def emit(self, event: DiagEvent) -> None: ...
|
||||||
@@ -0,0 +1,22 @@
|
|||||||
|
"""Windows Event Log reporter, WARN+ only (IMPLEMENTATION_PLAN §5.2).
|
||||||
|
|
||||||
|
Uses ``win32evtlog``; the source is registered during ``install``. pywin32 is
|
||||||
|
import-guarded so tests can run on any OS (IMPLEMENTATION_PLAN §9).
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from opcda_diagnozer.events import DiagEvent, Severity
|
||||||
|
|
||||||
|
|
||||||
|
class EventLogReporter:
|
||||||
|
"""Windows Event Log sink — implemented in Phase 2."""
|
||||||
|
|
||||||
|
def __init__(self, source: str = "OPCDA-Diagnozer", min_severity: str = "WARN") -> None:
|
||||||
|
self._source = source
|
||||||
|
self._min_severity = Severity(min_severity)
|
||||||
|
|
||||||
|
def emit(self, event: DiagEvent) -> None:
|
||||||
|
raise NotImplementedError(
|
||||||
|
"Phase 2: Event Log reporter (docs/IMPLEMENTATION_PLAN.md §5.2)"
|
||||||
|
)
|
||||||
@@ -0,0 +1,23 @@
|
|||||||
|
"""Optional HTTP webhook reporter (IMPLEMENTATION_PLAN §5.3).
|
||||||
|
|
||||||
|
Phase 2: POST one JSON event per request, optional bearer token, timeout plus
|
||||||
|
simple retry/drop on failure — must never block the poll loop (bounded queue).
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from opcda_diagnozer.events import DiagEvent
|
||||||
|
|
||||||
|
|
||||||
|
class HttpReporter:
|
||||||
|
"""Webhook sink — implemented in Phase 2."""
|
||||||
|
|
||||||
|
def __init__(self, url: str, bearer_token: str | None = None, timeout_s: float = 5.0) -> None:
|
||||||
|
self._url = url
|
||||||
|
self._bearer_token = bearer_token
|
||||||
|
self._timeout_s = timeout_s
|
||||||
|
|
||||||
|
def emit(self, event: DiagEvent) -> None:
|
||||||
|
raise NotImplementedError(
|
||||||
|
"Phase 2: HTTP webhook reporter (docs/IMPLEMENTATION_PLAN.md §5.3)"
|
||||||
|
)
|
||||||
@@ -0,0 +1,25 @@
|
|||||||
|
"""Rotating JSONL reporter — the primary evidence trail (IMPLEMENTATION_PLAN §5.1).
|
||||||
|
|
||||||
|
Phase 2 adds: size-based rotation with ``backups`` kept, atomic-ish append,
|
||||||
|
and a header line carrying the config digest for provenance.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from pathlib import Path
|
||||||
|
|
||||||
|
from opcda_diagnozer.events import DiagEvent
|
||||||
|
|
||||||
|
|
||||||
|
class JsonlReporter:
|
||||||
|
"""One JSON event per line, rotated by size — implemented in Phase 2."""
|
||||||
|
|
||||||
|
def __init__(self, directory: str | Path, max_mb: int = 50, backups: int = 10) -> None:
|
||||||
|
self._directory = Path(directory)
|
||||||
|
self._max_mb = max_mb
|
||||||
|
self._backups = backups
|
||||||
|
|
||||||
|
def emit(self, event: DiagEvent) -> None:
|
||||||
|
raise NotImplementedError(
|
||||||
|
"Phase 2: JSONL reporter (docs/IMPLEMENTATION_PLAN.md §5.1)"
|
||||||
|
)
|
||||||
@@ -0,0 +1,19 @@
|
|||||||
|
"""Windows service host via pywin32 ``ServiceFramework`` — Phase 3.
|
||||||
|
|
||||||
|
IMPLEMENTATION_PLAN §6.1: the service spawns the COM worker thread and must
|
||||||
|
stop cleanly (``STOP_PENDING``, join with timeout, abandon a hung COM thread
|
||||||
|
on shutdown). SCM recovery (restart on failure) is configured at install time.
|
||||||
|
"""
|
||||||
|
|
||||||
|
from __future__ import annotations
|
||||||
|
|
||||||
|
from collections.abc import Sequence
|
||||||
|
|
||||||
|
|
||||||
|
class OpcdaDiagnozerService:
|
||||||
|
"""pywin32 service wrapper — implemented in Phase 3."""
|
||||||
|
|
||||||
|
def __init__(self, args: Sequence[str]) -> None:
|
||||||
|
raise NotImplementedError(
|
||||||
|
"Phase 3: Windows service host (docs/IMPLEMENTATION_PLAN.md §6)"
|
||||||
|
)
|
||||||
@@ -0,0 +1,310 @@
|
|||||||
|
"""Browse tests (opc/browse.py + fake browser + CLI verbs).
|
||||||
|
|
||||||
|
Pure tests run on any OS against the fake client's address space; the COM
|
||||||
|
path is Windows-only and covered by the live smoke tests (IMPLEMENTATION_PLAN
|
||||||
|
§9: COM adapters are import-guarded).
|
||||||
|
"""
|
||||||
|
|
||||||
|
import sys
|
||||||
|
|
||||||
|
import pytest
|
||||||
|
|
||||||
|
from opcda_diagnozer.main import main as cli_main
|
||||||
|
from opcda_diagnozer.opc.base import Browser, DeviceInfo, OpcError, TagInfo
|
||||||
|
from opcda_diagnozer.opc.browse import (
|
||||||
|
MAX_DEPTH,
|
||||||
|
list_devices,
|
||||||
|
list_tags,
|
||||||
|
split_device_path,
|
||||||
|
tags_for_device,
|
||||||
|
)
|
||||||
|
from opcda_diagnozer.opc.fake import FAKE_SPACE, FakeOpcClient
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.fixture
|
||||||
|
def browser() -> Browser:
|
||||||
|
client = FakeOpcClient()
|
||||||
|
client.connect()
|
||||||
|
return client.create_browser()
|
||||||
|
|
||||||
|
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
# split_device_path
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.parametrize(
|
||||||
|
("raw", "expected"),
|
||||||
|
[
|
||||||
|
(None, ()),
|
||||||
|
((), ()),
|
||||||
|
("", ()),
|
||||||
|
(" ", ()),
|
||||||
|
("Simulation Items.Bucket Brigade", ("Simulation Items", "Bucket Brigade")),
|
||||||
|
("Simulation Items", ("Simulation Items",)),
|
||||||
|
("a..b", ("a", "b")), # empty segments dropped
|
||||||
|
(("Simulation Items", "Bucket Brigade"), ("Simulation Items", "Bucket Brigade")),
|
||||||
|
(("Simulation Items", " Bucket Brigade "), ("Simulation Items", "Bucket Brigade")),
|
||||||
|
(("Simulation Items", "", "Bucket Brigade"), ("Simulation Items", "Bucket Brigade")),
|
||||||
|
# explicit segments keep embedded dots intact (no split)
|
||||||
|
(("Bucket. Inc", "Device 1"), ("Bucket. Inc", "Device 1")),
|
||||||
|
],
|
||||||
|
)
|
||||||
|
def test_split_device_path(raw, expected: tuple[str, ...]) -> None:
|
||||||
|
assert split_device_path(raw) == expected
|
||||||
|
|
||||||
|
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
# list_devices
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_devices_top_level(browser: Browser) -> None:
|
||||||
|
space = list_devices(browser)
|
||||||
|
assert space.organization == "hierarchical"
|
||||||
|
assert space.root.sub_devices == ("Simulation Items", "Configured Aliases")
|
||||||
|
names = [d.name for d in space.devices]
|
||||||
|
assert names == ["Simulation Items", "Configured Aliases"]
|
||||||
|
assert all(d.path == (d.name,) for d in space.devices)
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_devices_depth_two_includes_sub_devices(browser: Browser) -> None:
|
||||||
|
space = list_devices(browser, depth=2)
|
||||||
|
paths = [d.path for d in space.devices]
|
||||||
|
assert ("Simulation Items", "Bucket Brigade") in paths
|
||||||
|
assert ("Simulation Items", "Random") in paths
|
||||||
|
# depth 2: the root's direct children plus their direct children
|
||||||
|
assert len(paths) == 2 + 8 # 2 top-level + 8 under Simulation Items
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_devices_reports_tag_counts(browser: Browser) -> None:
|
||||||
|
space = list_devices(browser)
|
||||||
|
by_name = {d.name: d for d in space.devices}
|
||||||
|
assert by_name["Simulation Items"].tag_names == () # no direct leaves
|
||||||
|
assert by_name["Configured Aliases"].tag_names == ("Alias1", "Alias2")
|
||||||
|
assert by_name["Simulation Items"].sub_devices[:4] == (
|
||||||
|
"Bucket Brigade", "Random", "Read Error", "Saw-toothed Waves",
|
||||||
|
)
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_devices_no_counts_skips_leaves(browser: Browser) -> None:
|
||||||
|
space = list_devices(browser, include_tag_counts=False)
|
||||||
|
assert space.root.tag_names == ()
|
||||||
|
assert all(d.tag_names == () for d in space.devices)
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.parametrize("depth", [0, -1, MAX_DEPTH + 1])
|
||||||
|
def test_list_devices_rejects_bad_depth(browser: Browser, depth: int) -> None:
|
||||||
|
with pytest.raises(ValueError):
|
||||||
|
list_devices(browser, depth=depth)
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_devices_cycle_guard(monkeypatch: pytest.MonkeyPatch) -> None:
|
||||||
|
"""A pathological self-nesting branch must not hang the recursive walk."""
|
||||||
|
|
||||||
|
class _LoopBrowser:
|
||||||
|
@property
|
||||||
|
def organization(self) -> str:
|
||||||
|
return "hierarchical"
|
||||||
|
|
||||||
|
def list_branches(self, path=()):
|
||||||
|
return ["Loop"] # "Loop" always contains another "Loop" — cycle
|
||||||
|
|
||||||
|
def list_leaves(self, path=()):
|
||||||
|
return []
|
||||||
|
|
||||||
|
def move_to(self, path):
|
||||||
|
return None
|
||||||
|
|
||||||
|
def close(self) -> None:
|
||||||
|
return None
|
||||||
|
|
||||||
|
with pytest.raises(OpcError, match="deeper than"):
|
||||||
|
list_tags(_LoopBrowser(), recursive=True) # type: ignore[arg-type]
|
||||||
|
|
||||||
|
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
# list_tags
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_tags_root_direct(browser: Browser) -> None:
|
||||||
|
tags = list_tags(browser)
|
||||||
|
assert [t.name for t in tags] == ["#MonitorACLFile", "@ClientCount", "@Clients"]
|
||||||
|
assert all(t.item_id == t.name for t in tags) # root leaves: bare ItemIDs
|
||||||
|
assert all(t.path == () for t in tags)
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_tags_of_device_dotted_string(browser: Browser) -> None:
|
||||||
|
tags = list_tags(browser, device="Simulation Items.Bucket Brigade")
|
||||||
|
item_ids = [t.item_id for t in tags]
|
||||||
|
assert "Bucket Brigade.Int1" in item_ids
|
||||||
|
assert "Bucket Brigade.Real8" in item_ids
|
||||||
|
assert len(tags) == 7
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_tags_of_device_segments(browser: Browser) -> None:
|
||||||
|
tags = list_tags(browser, device=["Simulation Items", "Random"])
|
||||||
|
assert {t.name for t in tags} == {"Int1", "Int4", "Money", "Time"}
|
||||||
|
assert all(t.path == ("Simulation Items", "Random") for t in tags)
|
||||||
|
|
||||||
|
|
||||||
|
def test_list_tags_recursive(browser: Browser) -> None:
|
||||||
|
tags = list_tags(browser, device="Simulation Items", recursive=True)
|
||||||
|
item_ids = {t.item_id for t in tags}
|
||||||
|
# direct children of "Simulation Items" have no leaves; recursion gathers all
|
||||||
|
assert "Bucket Brigade.Int1" in item_ids
|
||||||
|
assert "Random.Money" in item_ids
|
||||||
|
assert "Read Error.Int4" in item_ids
|
||||||
|
assert "Saw-toothed Waves.Real8" in item_ids
|
||||||
|
assert all(t.path for t in tags)
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
def test_tags_are_sorted_case_insensitively(browser: Browser) -> None:
|
||||||
|
tags = list_tags(browser, device="Simulation Items.Bucket Brigade")
|
||||||
|
assert [t.item_id for t in tags] == sorted(
|
||||||
|
(t.item_id for t in tags), key=lambda s: s.lower()
|
||||||
|
)
|
||||||
|
|
||||||
|
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
# fake browser & client protocol conformance
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_browser_matches_protocol(browser: Browser) -> None:
|
||||||
|
# runtime_checkable protocol: structural check
|
||||||
|
assert isinstance(browser, Browser)
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_client_browser_requires_connect() -> None:
|
||||||
|
client = FakeOpcClient()
|
||||||
|
with pytest.raises(OpcError, match="before connect"):
|
||||||
|
client.create_browser()
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_browser_unknown_branch_raises() -> None:
|
||||||
|
client = FakeOpcClient()
|
||||||
|
client.connect()
|
||||||
|
browser = client.create_browser()
|
||||||
|
with pytest.raises(OpcError, match="no such branch"):
|
||||||
|
browser.list_branches(["Simulation Items", "Missing"])
|
||||||
|
with pytest.raises(OpcError, match="no such branch"):
|
||||||
|
browser.list_leaves(["Missing"])
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_flat_space_reports_flat_organization() -> None:
|
||||||
|
client = FakeOpcClient(space={(): ((), ("Tag1", "Tag2"))})
|
||||||
|
client.connect()
|
||||||
|
browser = client.create_browser()
|
||||||
|
assert browser.organization == "flat"
|
||||||
|
space = list_devices(browser)
|
||||||
|
assert space.devices == ()
|
||||||
|
assert space.root.tag_names == ("Tag1", "Tag2")
|
||||||
|
|
||||||
|
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
# CLI verbs (against the fake backend through a config file)
|
||||||
|
# --------------------------------------------------------------------------- #
|
||||||
|
|
||||||
|
|
||||||
|
def _run_cli(monkeypatch: pytest.MonkeyPatch, tmp_path, args: list[str]) -> int:
|
||||||
|
"""Run the CLI with the fake client injected in place of the COM adapter."""
|
||||||
|
import opcda_diagnozer.main as main_mod
|
||||||
|
from opcda_diagnozer.opc.fake import FakeOpcClient
|
||||||
|
|
||||||
|
config = tmp_path / "config.yaml"
|
||||||
|
config.write_text(
|
||||||
|
"opc:\n server: Fake.Server.1\ntags:\n - name: Bucket Brigade.Int1\n",
|
||||||
|
encoding="utf-8",
|
||||||
|
)
|
||||||
|
client = FakeOpcClient()
|
||||||
|
|
||||||
|
def _fake_connect(config_path: str):
|
||||||
|
client.connect()
|
||||||
|
return client
|
||||||
|
|
||||||
|
monkeypatch.setattr(main_mod, "_connect_from_config", _fake_connect)
|
||||||
|
return cli_main(args)
|
||||||
|
|
||||||
|
|
||||||
|
def test_cli_list_devices_table(monkeypatch: pytest.MonkeyPatch, tmp_path, capsys) -> None:
|
||||||
|
code = _run_cli(monkeypatch, tmp_path, ["list-devices", "-c", str(tmp_path / "config.yaml")])
|
||||||
|
out = capsys.readouterr().out
|
||||||
|
assert code == 0
|
||||||
|
assert "Simulation Items" in out
|
||||||
|
assert "Configured Aliases" in out
|
||||||
|
assert "2 tags" in out
|
||||||
|
|
||||||
|
|
||||||
|
def test_cli_list_devices_json(monkeypatch: pytest.MonkeyPatch, tmp_path, capsys) -> None:
|
||||||
|
code = _run_cli(monkeypatch, tmp_path, [
|
||||||
|
"list-devices", "-c", str(tmp_path / "config.yaml"), "--json",
|
||||||
|
])
|
||||||
|
out = capsys.readouterr().out
|
||||||
|
assert code == 0
|
||||||
|
import json
|
||||||
|
|
||||||
|
lines = [json.loads(line) for line in out.splitlines() if line.strip()]
|
||||||
|
assert {d["name"] for d in lines} == {"Simulation Items", "Configured Aliases"}
|
||||||
|
assert lines[0]["qualified_name"] == "Simulation Items" # walk order = root order
|
||||||
|
|
||||||
|
|
||||||
|
def test_cli_list_tags_dotted(monkeypatch: pytest.MonkeyPatch, tmp_path, capsys) -> None:
|
||||||
|
code = _run_cli(monkeypatch, tmp_path, [
|
||||||
|
"list-tags", "-c", str(tmp_path / "config.yaml"),
|
||||||
|
"Simulation Items.Bucket Brigade",
|
||||||
|
])
|
||||||
|
out = capsys.readouterr().out
|
||||||
|
assert code == 0
|
||||||
|
assert "Bucket Brigade.Int1" in out
|
||||||
|
assert "Bucket Brigade.Real8" in out
|
||||||
|
|
||||||
|
|
||||||
|
def test_cli_list_tags_segments_and_recursive(
|
||||||
|
monkeypatch: pytest.MonkeyPatch, tmp_path, capsys
|
||||||
|
) -> None:
|
||||||
|
code = _run_cli(monkeypatch, tmp_path, [
|
||||||
|
"list-tags", "-c", str(tmp_path / "config.yaml"),
|
||||||
|
"Simulation Items", "--recursive", "--json",
|
||||||
|
])
|
||||||
|
out = capsys.readouterr().out
|
||||||
|
assert code == 0
|
||||||
|
import json
|
||||||
|
|
||||||
|
item_ids = {json.loads(line)["item_id"] for line in out.splitlines() if line.strip()}
|
||||||
|
assert "Bucket Brigade.Int1" in item_ids
|
||||||
|
assert "Random.Money" in item_ids
|
||||||
|
|
||||||
|
|
||||||
|
def test_cli_list_tags_missing_device_fails_cleanly(
|
||||||
|
monkeypatch: pytest.MonkeyPatch, tmp_path, capsys
|
||||||
|
) -> None:
|
||||||
|
code = _run_cli(monkeypatch, tmp_path, [
|
||||||
|
"list-tags", "-c", str(tmp_path / "config.yaml"), "No.Such.Device",
|
||||||
|
])
|
||||||
|
captured = capsys.readouterr()
|
||||||
|
assert code == 2
|
||||||
|
assert "FAILED" in captured.err
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.skipif(sys.platform != "win32", reason="COM browse needs Windows + pywin32")
|
||||||
|
def test_live_automation_browse_smoke() -> None:
|
||||||
|
"""Live smoke test — requires the Matrikon simulation server on this dev box."""
|
||||||
|
pytest.importorskip("pythoncom")
|
||||||
|
from opcda_diagnozer.opc.automation import AutomationOpcClient
|
||||||
|
|
||||||
|
client = AutomationOpcClient(server="Matrikon.OPC.Simulation.1")
|
||||||
|
try:
|
||||||
|
client.connect()
|
||||||
|
browser = client.create_browser()
|
||||||
|
devices = list_devices(browser)
|
||||||
|
assert devices.organization == "hierarchical"
|
||||||
|
assert any(d.name == "Simulation Items" for d in devices.devices)
|
||||||
|
tags = list_tags(browser, device="Simulation Items.Bucket Brigade")
|
||||||
|
assert any(t.item_id == "Bucket Brigade.Int1" for t in tags)
|
||||||
|
except OpcError as exc:
|
||||||
|
pytest.skip(f"simulation server not usable on this machine: {exc}")
|
||||||
|
finally:
|
||||||
|
client.close()
|
||||||
@@ -0,0 +1,85 @@
|
|||||||
|
"""Config loading + validation tests (IMPLEMENTATION_PLAN §4.1)."""
|
||||||
|
|
||||||
|
from pathlib import Path
|
||||||
|
|
||||||
|
import pytest
|
||||||
|
|
||||||
|
from opcda_diagnozer.config import ConfigError, load_config
|
||||||
|
|
||||||
|
EXAMPLE = Path(__file__).resolve().parents[1] / "config.example.yaml"
|
||||||
|
|
||||||
|
|
||||||
|
def _write(tmp_path: Path, text: str) -> Path:
|
||||||
|
p = tmp_path / "config.yaml"
|
||||||
|
p.write_text(text, encoding="utf-8")
|
||||||
|
return p
|
||||||
|
|
||||||
|
|
||||||
|
def test_example_config_loads() -> None:
|
||||||
|
config = load_config(EXAMPLE)
|
||||||
|
assert config.opc.server == "Matrikon.OPC.Simulation.1"
|
||||||
|
assert config.opc.host == "CONTROL-HOST01"
|
||||||
|
assert len(config.tags) == 2
|
||||||
|
assert config.tags[0].name == "Channel1.Device1.Counter"
|
||||||
|
assert config.tags[0].expect_change is True
|
||||||
|
assert config.tags[1].expect_change is False
|
||||||
|
assert config.poll.interval_s == 1.0
|
||||||
|
assert config.poll.timeout_ms == 5000
|
||||||
|
assert config.latency.warn_ms == 1000
|
||||||
|
assert config.report.eventlog.min_severity == "WARN"
|
||||||
|
assert config.report.jsonl.dir == "C:/ProgramData/OPCDA-Diagnozer/logs"
|
||||||
|
|
||||||
|
|
||||||
|
def test_missing_file_is_actionable() -> None:
|
||||||
|
with pytest.raises(ConfigError, match="not found"):
|
||||||
|
load_config("no-such-config.yaml")
|
||||||
|
|
||||||
|
|
||||||
|
def test_missing_opc_section_is_actionable(tmp_path: Path) -> None:
|
||||||
|
p = _write(tmp_path, "tags:\n - name: t\n")
|
||||||
|
with pytest.raises(ConfigError, match=r"opc: missing required key 'server'"):
|
||||||
|
load_config(p)
|
||||||
|
|
||||||
|
|
||||||
|
def test_unknown_key_rejected(tmp_path: Path) -> None:
|
||||||
|
p = _write(tmp_path, "opc:\n server: X\n typo_key: 1\ntags:\n - name: t\n")
|
||||||
|
with pytest.raises(ConfigError, match="typo_key"):
|
||||||
|
load_config(p)
|
||||||
|
|
||||||
|
|
||||||
|
def test_unknown_top_level_section_rejected(tmp_path: Path) -> None:
|
||||||
|
p = _write(tmp_path, "opc:\n server: X\ntags:\n - name: t\nnonsense: {}\n")
|
||||||
|
with pytest.raises(ConfigError, match="nonsense"):
|
||||||
|
load_config(p)
|
||||||
|
|
||||||
|
|
||||||
|
def test_empty_tags_rejected(tmp_path: Path) -> None:
|
||||||
|
p = _write(tmp_path, "opc:\n server: X\ntags: []\n")
|
||||||
|
with pytest.raises(ConfigError, match="at least one tag"):
|
||||||
|
load_config(p)
|
||||||
|
|
||||||
|
|
||||||
|
def test_duplicate_tags_rejected(tmp_path: Path) -> None:
|
||||||
|
p = _write(tmp_path, "opc:\n server: X\ntags:\n - name: a\n - name: a\n")
|
||||||
|
with pytest.raises(ConfigError, match="duplicate"):
|
||||||
|
load_config(p)
|
||||||
|
|
||||||
|
|
||||||
|
def test_latency_threshold_order_rejected(tmp_path: Path) -> None:
|
||||||
|
p = _write(
|
||||||
|
tmp_path,
|
||||||
|
"opc:\n server: X\ntags:\n - name: t\n"
|
||||||
|
"latency:\n warn_ms: 5000\n critical_ms: 1000\n",
|
||||||
|
)
|
||||||
|
with pytest.raises(ConfigError, match="warn_ms"):
|
||||||
|
load_config(p)
|
||||||
|
|
||||||
|
|
||||||
|
def test_hard_hang_must_exceed_timeout(tmp_path: Path) -> None:
|
||||||
|
p = _write(
|
||||||
|
tmp_path,
|
||||||
|
"opc:\n server: X\ntags:\n - name: t\n"
|
||||||
|
"poll:\n timeout_ms: 5000\n hard_hang_s: 4\n",
|
||||||
|
)
|
||||||
|
with pytest.raises(ConfigError, match="hard_hang_s"):
|
||||||
|
load_config(p)
|
||||||
@@ -0,0 +1,20 @@
|
|||||||
|
"""Detector tests (SPECIFICATION §6). Detector implementations land in Phase 1."""
|
||||||
|
|
||||||
|
from datetime import datetime, timezone
|
||||||
|
|
||||||
|
from opcda_diagnozer.monitor.detectors import PollOutcome
|
||||||
|
from opcda_diagnozer.opc.base import ReadResult
|
||||||
|
|
||||||
|
|
||||||
|
def test_poll_outcome_holds_one_cycle() -> None:
|
||||||
|
result = ReadResult(
|
||||||
|
tag="Channel1.Device1.Level", value=1.5, quality_raw=0xC0, device_time=None
|
||||||
|
)
|
||||||
|
outcome = PollOutcome(
|
||||||
|
started_at=datetime.now(timezone.utc),
|
||||||
|
rtt_ms=12.5,
|
||||||
|
results=(result,),
|
||||||
|
)
|
||||||
|
assert outcome.rtt_ms == 12.5
|
||||||
|
assert outcome.error is None
|
||||||
|
assert outcome.results[0].tag == "Channel1.Device1.Level"
|
||||||
@@ -0,0 +1,66 @@
|
|||||||
|
"""Discovery tests (opc/discovery.py).
|
||||||
|
|
||||||
|
Pure tests run on any OS; the registry/COM scans are Windows-only and skip
|
||||||
|
elsewhere (IMPLEMENTATION_PLAN §9: COM adapters are import-guarded).
|
||||||
|
"""
|
||||||
|
|
||||||
|
import sys
|
||||||
|
|
||||||
|
import pytest
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import OpcError
|
||||||
|
from opcda_diagnozer.opc.discovery import (
|
||||||
|
DA_CATEGORIES,
|
||||||
|
ServerInfo,
|
||||||
|
list_servers,
|
||||||
|
normalize_string_array,
|
||||||
|
)
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.parametrize(
|
||||||
|
("raw", "expected"),
|
||||||
|
[
|
||||||
|
(None, []),
|
||||||
|
("", []),
|
||||||
|
("One.Server.1", ["One.Server.1"]),
|
||||||
|
(("A.Sim.1", "A.Sim.2"), ["A.Sim.1", "A.Sim.2"]),
|
||||||
|
(("A.Sim.1", " A.Sim.1 ", "A.Sim.2"), ["A.Sim.1", "A.Sim.2"]), # dedupe + trim
|
||||||
|
((1, None, "A.Sim.1"), ["A.Sim.1"]), # non-strings dropped
|
||||||
|
([], []),
|
||||||
|
],
|
||||||
|
)
|
||||||
|
def test_normalize_string_array(raw: object, expected: list[str]) -> None:
|
||||||
|
assert normalize_string_array(raw) == expected
|
||||||
|
|
||||||
|
|
||||||
|
def test_registry_source_rejects_remote_host() -> None:
|
||||||
|
with pytest.raises(OpcError, match="local"):
|
||||||
|
list_servers(host="REMOTE-HOST", source="registry")
|
||||||
|
|
||||||
|
|
||||||
|
def test_unknown_source_rejected() -> None:
|
||||||
|
with pytest.raises(ValueError, match="unknown source"):
|
||||||
|
list_servers(source="nonsense") # type: ignore[arg-type]
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.skipif(sys.platform != "win32", reason="winreg scan is Windows-only")
|
||||||
|
def test_registry_scan_local_structural() -> None:
|
||||||
|
servers = list_servers(source="registry")
|
||||||
|
assert isinstance(servers, list)
|
||||||
|
for server in servers:
|
||||||
|
assert server.source == "registry"
|
||||||
|
assert server.prog_id # non-empty ProgID (or CLSID fallback)
|
||||||
|
assert server.clsid is not None
|
||||||
|
assert server.clsid.startswith("{") and server.clsid.endswith("}")
|
||||||
|
assert set(server.da_versions) <= set(DA_CATEGORIES.values())
|
||||||
|
assert [s.prog_id.lower() for s in servers] == sorted(s.prog_id.lower() for s in servers)
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.skipif(sys.platform != "win32", reason="COM enumeration needs Windows + pywin32")
|
||||||
|
def test_automation_enumeration_smoke() -> None:
|
||||||
|
"""Live smoke test — requires a registered Automation Wrapper (dev box)."""
|
||||||
|
try:
|
||||||
|
servers = list_servers(source="automation")
|
||||||
|
except OpcError as exc:
|
||||||
|
pytest.skip(f"Automation Wrapper not usable on this machine: {exc}")
|
||||||
|
assert all(s.source == "automation" and s.prog_id for s in servers)
|
||||||
@@ -0,0 +1,33 @@
|
|||||||
|
"""End-to-end pipeline tests against opc.fake (IMPLEMENTATION_PLAN §9).
|
||||||
|
|
||||||
|
The fake client lets the event pipeline run without COM/hardware; Phase 1
|
||||||
|
grows this into the full scenario suite.
|
||||||
|
"""
|
||||||
|
|
||||||
|
import pytest
|
||||||
|
|
||||||
|
from opcda_diagnozer.opc.base import OpcError
|
||||||
|
from opcda_diagnozer.opc.fake import FakeOpcClient
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_reads_good_quality() -> None:
|
||||||
|
client = FakeOpcClient()
|
||||||
|
client.connect()
|
||||||
|
results = client.read(["Channel1.Device1.Counter", "Channel1.Device1.Level"])
|
||||||
|
assert [r.tag for r in results] == ["Channel1.Device1.Counter", "Channel1.Device1.Level"]
|
||||||
|
assert all(r.quality_raw == 0xC0 for r in results)
|
||||||
|
assert all(r.device_time is not None for r in results)
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_requires_connect_first() -> None:
|
||||||
|
client = FakeOpcClient()
|
||||||
|
with pytest.raises(OpcError):
|
||||||
|
client.read(["Channel1.Device1.Counter"])
|
||||||
|
|
||||||
|
|
||||||
|
def test_fake_close_disconnects() -> None:
|
||||||
|
client = FakeOpcClient()
|
||||||
|
client.connect()
|
||||||
|
client.close()
|
||||||
|
with pytest.raises(OpcError):
|
||||||
|
client.read(["Channel1.Device1.Counter"])
|
||||||
@@ -0,0 +1,41 @@
|
|||||||
|
"""Quality decode tests (SPECIFICATION §7)."""
|
||||||
|
|
||||||
|
import pytest
|
||||||
|
|
||||||
|
from opcda_diagnozer.quality import QualityClass, decode_quality
|
||||||
|
|
||||||
|
|
||||||
|
@pytest.mark.parametrize(
|
||||||
|
("raw", "name", "quality_class"),
|
||||||
|
[
|
||||||
|
(0xC0, "GOOD", QualityClass.GOOD),
|
||||||
|
(0xD8, "GOOD_LOCAL_OVERRIDE", QualityClass.GOOD),
|
||||||
|
(0x44, "UNCERTAIN_LAST_USABLE", QualityClass.UNCERTAIN),
|
||||||
|
(0x40, "UNCERTAIN", QualityClass.UNCERTAIN),
|
||||||
|
(0x00, "BAD", QualityClass.BAD),
|
||||||
|
(0x04, "BAD_CONFIG_ERROR", QualityClass.BAD),
|
||||||
|
(0x08, "BAD_NOT_CONNECTED", QualityClass.BAD),
|
||||||
|
(0x0C, "BAD_DEVICE_FAILURE", QualityClass.BAD),
|
||||||
|
(0x10, "BAD_SENSOR_FAILURE", QualityClass.BAD),
|
||||||
|
(0x14, "BAD_LAST_KNOWN_VALUE", QualityClass.BAD),
|
||||||
|
(0x18, "BAD_COMM_FAILURE", QualityClass.BAD),
|
||||||
|
(0x1C, "BAD_OUT_OF_SERVICE", QualityClass.BAD),
|
||||||
|
],
|
||||||
|
)
|
||||||
|
def test_spec_table_decodes(raw: int, name: str, quality_class: QualityClass) -> None:
|
||||||
|
info = decode_quality(raw)
|
||||||
|
assert info.name == name
|
||||||
|
assert info.quality_class is quality_class
|
||||||
|
assert info.raw_hex == f"0x{raw:02X}"
|
||||||
|
|
||||||
|
|
||||||
|
def test_unknown_code_falls_back_to_class() -> None:
|
||||||
|
info = decode_quality(0x20)
|
||||||
|
assert info.quality_class is QualityClass.BAD
|
||||||
|
assert info.name.startswith("BAD_")
|
||||||
|
|
||||||
|
|
||||||
|
def test_class_bits_come_from_low_byte() -> None:
|
||||||
|
# 16-bit quality word: the high byte must not affect the class (§7)
|
||||||
|
assert decode_quality(0x0118).quality_class is QualityClass.BAD
|
||||||
|
assert decode_quality(0xFFC0).quality_class is QualityClass.GOOD
|
||||||
@@ -0,0 +1,11 @@
|
|||||||
|
"""State machine tests (SPECIFICATION §10.2). Transitions land in Phase 1."""
|
||||||
|
|
||||||
|
from opcda_diagnozer.monitor.state import ConnectionState
|
||||||
|
|
||||||
|
|
||||||
|
def test_connection_states_match_spec() -> None:
|
||||||
|
assert {s.name for s in ConnectionState} == {
|
||||||
|
"CONNECTING",
|
||||||
|
"CONNECTED",
|
||||||
|
"RECONNECT_WAIT",
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user