feat(client-monitoring): finalize client-side monitoring and UTC logging
- add process health bridge and monitoring flow between display_manager and simclient - publish health + warn/error log topics over MQTT - standardize log/payload/screenshot timestamps to UTC (Z) to avoid DST drift - improve video handling: python-vlc fullscreen enforcement and runtime PID reporting - update README and copilot instructions with monitoring architecture and troubleshooting - add Phase 3 monitoring implementation documentation - update gitignore for new runtime/log artifacts
This commit is contained in:
RobbStarkAustria
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PHASE_3_CLIENT_MONITORING_IMPLEMENTATION.md
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PHASE_3_CLIENT_MONITORING_IMPLEMENTATION.md
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# Phase 3: Client-Side Monitoring Implementation
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**Status**: ✅ COMPLETE
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**Date**: 11. März 2026
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**Architecture**: Two-process design with health-state bridge
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---
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## Overview
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This document describes the **Phase 3** client-side monitoring implementation integrated into the existing infoscreen-dev codebase. The implementation adds:
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1. ✅ **Health-state tracking** for all display processes (Impressive, Chromium, VLC)
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2. ✅ **Tiered logging**: Local rotating logs + selective MQTT transmission
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3. ✅ **Process crash detection** with bounded restart attempts
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4. ✅ **MQTT health/log topics** feeding the monitoring server
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5. ✅ **Impressive-aware process mapping** (presentations → impressive, websites → chromium, videos → vlc)
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---
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## Architecture
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### Two-Process Design
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```
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┌─────────────────────────────────────────────────────────┐
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│ simclient.py (MQTT Client) │
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│ - Discovers device, sends heartbeat │
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│ - Downloads presentation files │
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│ - Reads health state from display_manager │
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│ - Publishes health/log messages to MQTT │
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│ - Sends screenshots for dashboard │
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└────────┬────────────────────────────────────┬───────────┘
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│ │
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│ reads: current_process_health.json │
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│ │
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│ writes: current_event.json │
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│ │
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┌────────▼────────────────────────────────────▼───────────┐
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│ display_manager.py (Display Control) │
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│ - Monitors events and manages displays │
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│ - Launches Impressive (presentations) │
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│ - Launches Chromium (websites) │
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│ - Launches VLC (videos) │
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│ - Tracks process health and crashes │
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│ - Detects and restarts crashed processes │
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│ - Writes health state to JSON bridge │
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│ - Captures screenshots to shared folder │
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└─────────────────────────────────────────────────────────┘
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```
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---
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## Implementation Details
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### 1. Health State Tracking (display_manager.py)
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**File**: `src/display_manager.py`
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**New Class**: `ProcessHealthState`
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Tracks process health and persists to JSON for simclient to read:
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```python
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class ProcessHealthState:
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"""Track and persist process health state for monitoring integration"""
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- event_id: Currently active event identifier
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- event_type: presentation, website, video, or None
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- process_name: impressive, chromium-browser, vlc, or None
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- process_pid: Process ID or None for libvlc
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- status: running, crashed, starting, stopped
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- restart_count: Number of restart attempts
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- max_restarts: Maximum allowed restarts (3)
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```
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Methods:
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- `update_running()` - Mark process as started (logs to monitoring.log)
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- `update_crashed()` - Mark process as crashed (warning to monitoring.log)
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- `update_restart_attempt()` - Increment restart counter (logs attempt and checks max)
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- `update_stopped()` - Mark process as stopped (info to monitoring.log)
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- `save()` - Persist state to `src/current_process_health.json`
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**New Health State File**: `src/current_process_health.json`
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```json
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{
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"event_id": "event_123",
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"event_type": "presentation",
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"current_process": "impressive",
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"process_pid": 1234,
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"process_status": "running",
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"restart_count": 0,
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"timestamp": "2026-03-11T10:30:45.123456+00:00"
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}
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```
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### 2. Monitoring Logger (both files)
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**Local Rotating Logs**: 5 files × 5 MB each = 25 MB max per device
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**display_manager.py**:
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```python
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MONITORING_LOG_PATH = "logs/monitoring.log"
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monitoring_logger = logging.getLogger("monitoring")
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monitoring_handler = RotatingFileHandler(MONITORING_LOG_PATH, maxBytes=5*1024*1024, backupCount=5)
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```
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**simclient.py**:
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- Shares same `logs/monitoring.log` file
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- Both processes write to monitoring logger for health events
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- Local logs never rotate (persisted for technician inspection)
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**Log Filtering** (tiered strategy):
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- **ERROR**: Local + MQTT (published to `infoscreen/{uuid}/logs/error`)
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- **WARN**: Local + MQTT (published to `infoscreen/{uuid}/logs/warn`)
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- **INFO**: Local only (unless `DEBUG_MODE=1`)
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- **DEBUG**: Local only (always)
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### 3. Process Mapping with Impressive Support
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**display_manager.py** - When starting processes:
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| Event Type | Process Name | Health Status |
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|-----------|--------------|---------------|
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| presentation | `impressive` | tracked with PID |
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| website/webpage/webuntis | `chromium` or `chromium-browser` | tracked with PID |
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| video | `vlc` | tracked (may have no PID if using libvlc) |
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**Per-Process Updates**:
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- Presentation: `health.update_running('event_id', 'presentation', 'impressive', pid)`
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- Website: `health.update_running('event_id', 'website', browser_name, pid)`
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- Video: `health.update_running('event_id', 'video', 'vlc', pid or None)`
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### 4. Crash Detection and Restart Logic
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**display_manager.py** - `process_events()` method:
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```
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If process not running AND same event_id:
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├─ Check exit code
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├─ If presentation with exit code 0: Normal completion (no restart)
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├─ Else: Mark crashed
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│ ├─ health.update_crashed()
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│ └─ health.update_restart_attempt()
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│ ├─ If restart_count > max_restarts: Give up
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│ └─ Else: Restart display (loop back to start_display_for_event)
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└─ Log to monitoring.log at each step
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```
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**Restart Logic**:
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- Max 3 restart attempts per event
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- Restarts only if same event still active
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- Graceful exit (code 0) for Impressive auto-quit presentations is treated as normal
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- All crashes logged to monitoring.log with context
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### 5. MQTT Health and Log Topics
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**simclient.py** - New functions:
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**`read_health_state()`**
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- Reads `src/current_process_health.json` written by display_manager
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- Returns dict or None if no active process
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**`publish_health_message(client, client_id)`**
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- Topic: `infoscreen/{uuid}/health`
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- QoS: 1 (reliable)
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- Payload:
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```json
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{
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"timestamp": "2026-03-11T10:30:45.123456+00:00",
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"expected_state": {
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"event_id": "event_123"
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},
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"actual_state": {
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"process": "impressive",
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"pid": 1234,
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"status": "running"
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}
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}
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```
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**`publish_log_message(client, client_id, level, message, context)`**
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- Topics: `infoscreen/{uuid}/logs/error` or `infoscreen/{uuid}/logs/warn`
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- QoS: 1 (reliable)
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- Log level filtering (only ERROR/WARN sent unless DEBUG_MODE=1)
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- Payload:
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```json
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{
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"timestamp": "2026-03-11T10:30:45.123456+00:00",
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"message": "Process started: event_id=123 event_type=presentation process=impressive pid=1234",
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"context": {
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"event_id": "event_123",
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"process": "impressive",
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"event_type": "presentation"
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}
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}
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```
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**Enhanced Dashboard Heartbeat**:
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- Topic: `infoscreen/{uuid}/dashboard`
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- Now includes `process_health` block with event_id, process name, status, restart count
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### 6. Integration Points
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**Existing Features Preserved**:
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- ✅ Impressive PDF presentations with auto-advance and loop
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- ✅ Chromium website display with auto-scroll injection
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- ✅ VLC video playback (python-vlc preferred, binary fallback)
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- ✅ Screenshot capture and transmission
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- ✅ HDMI-CEC TV control
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- ✅ Two-process architecture
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**New Integration Points**:
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| File | Function | Change |
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|------|----------|--------|
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| display_manager.py | `__init__()` | Initialize `ProcessHealthState()` |
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| display_manager.py | `start_presentation()` | Call `health.update_running()` with impressive |
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| display_manager.py | `start_video()` | Call `health.update_running()` with vlc |
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| display_manager.py | `start_webpage()` | Call `health.update_running()` with chromium |
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| display_manager.py | `process_events()` | Detect crashes, call `health.update_crashed()` and `update_restart_attempt()` |
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| display_manager.py | `stop_current_display()` | Call `health.update_stopped()` |
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| simclient.py | `screenshot_service_thread()` | (No changes to interval) |
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| simclient.py | Main heartbeat loop | Call `publish_health_message()` after successful heartbeat |
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| simclient.py | `send_screenshot_heartbeat()` | Read health state and include in dashboard payload |
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---
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## Logging Hierarchy
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### Local Rotating Files (5 × 5 MB)
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**`logs/display_manager.log`** (existing - updated):
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- Display event processing
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- Process lifecycle (start/stop)
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- HDMI-CEC operations
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- Presentation status
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- Video/website startup
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**`logs/simclient.log`** (existing - updated):
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- MQTT connection/reconnection
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- Discovery and heartbeat
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- File downloads
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- Group membership changes
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- Dashboard payload info
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**`logs/monitoring.log`** (NEW):
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- Process health events (start, crash, restart, stop)
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- Both display_manager and simclient write here
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- Centralized health tracking
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- Technician-focused: "What happened to the processes?"
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```
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# Example monitoring.log entries:
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2026-03-11 10:30:45 [INFO] Process started: event_id=event_123 event_type=presentation process=impressive pid=1234
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2026-03-11 10:35:20 [WARNING] Process crashed: event_id=event_123 event_type=presentation process=impressive restart_count=0/3
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2026-03-11 10:35:20 [WARNING] Restarting process: attempt 1/3 for impressive
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2026-03-11 10:35:25 [INFO] Process started: event_id=event_123 event_type=presentation process=impressive pid=1245
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```
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### MQTT Transmission (Selective)
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**Always sent** (when error occurs):
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- `infoscreen/{uuid}/logs/error` - Critical failures
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- `infoscreen/{uuid}/logs/warn` - Restarts, crashes, missing binaries
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**Development mode only** (if DEBUG_MODE=1):
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- `infoscreen/{uuid}/logs/info` - Event start/stop, process running status
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**Never sent**:
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- DEBUG messages (local-only debug details)
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- INFO messages in production
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---
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## Environment Variables
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No new required variables. Existing configuration supports monitoring:
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```bash
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# Existing (unchanged):
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ENV=development|production
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DEBUG_MODE=0|1 # Enables INFO logs to MQTT
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LOG_LEVEL=DEBUG|INFO|WARNING|ERROR # Local log verbosity
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HEARTBEAT_INTERVAL=5|60 # seconds
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SCREENSHOT_INTERVAL=30|300 # seconds (display_manager_screenshot_capture)
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# Recommended for monitoring:
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SCREENSHOT_CAPTURE_INTERVAL=30 # How often display_manager captures screenshots
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SCREENSHOT_MAX_WIDTH=800 # Downscale for bandwidth
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SCREENSHOT_JPEG_QUALITY=70 # Balance quality/size
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# File server (if different from MQTT broker):
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FILE_SERVER_HOST=192.168.1.100
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FILE_SERVER_PORT=8000
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FILE_SERVER_SCHEME=http
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```
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---
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## Testing Validation
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||||
|
||||
### System-Level Test Sequence
|
||||
|
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**1. Start Services**:
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```bash
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# Terminal 1: Display Manager
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./scripts/start-display-manager.sh
|
||||
|
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# Terminal 2: MQTT Client
|
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./scripts/start-dev.sh
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||||
|
||||
# Terminal 3: Monitor logs
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tail -f logs/monitoring.log
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||||
```
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||||
**2. Trigger Each Event Type**:
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```bash
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# Via test menu or MQTT publish:
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./scripts/test-display-manager.sh # Options 1-3 trigger events
|
||||
```
|
||||
|
||||
**3. Verify Health State File**:
|
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```bash
|
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# Check health state gets written immediately
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cat src/current_process_health.json
|
||||
# Should show: event_id, event_type, current_process (impressive/chromium/vlc), process_status=running
|
||||
```
|
||||
|
||||
**4. Check MQTT Topics**:
|
||||
```bash
|
||||
# Monitor health messages:
|
||||
mosquitto_sub -h localhost -t "infoscreen/+/health" -v
|
||||
|
||||
# Monitor log messages:
|
||||
mosquitto_sub -h localhost -t "infoscreen/+/logs/#" -v
|
||||
|
||||
# Monitor dashboard heartbeat:
|
||||
mosquitto_sub -h localhost -t "infoscreen/+/dashboard" -v | head -c 500 && echo "..."
|
||||
```
|
||||
|
||||
**5. Simulate Process Crash**:
|
||||
```bash
|
||||
# Find impressive/chromium/vlc PID:
|
||||
ps aux | grep -E 'impressive|chromium|vlc'
|
||||
|
||||
# Kill process:
|
||||
kill -9 <pid>
|
||||
|
||||
# Watch monitoring.log for crash detection and restart
|
||||
tail -f logs/monitoring.log
|
||||
# Should see: [WARNING] Process crashed... [WARNING] Restarting process...
|
||||
```
|
||||
|
||||
**6. Verify Server Integration**:
|
||||
```bash
|
||||
# Server receives health messages:
|
||||
sqlite3 infoscreen.db "SELECT process_status, current_process, restart_count FROM clients WHERE uuid='...';"
|
||||
# Should show latest status from health message
|
||||
|
||||
# Server receives logs:
|
||||
sqlite3 infoscreen.db "SELECT level, message FROM client_logs WHERE client_uuid='...' ORDER BY timestamp DESC LIMIT 10;"
|
||||
# Should show ERROR/WARN entries from crashes/restarts
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Troubleshooting
|
||||
|
||||
### Health State File Not Created
|
||||
|
||||
**Symptom**: `src/current_process_health.json` missing
|
||||
**Causes**:
|
||||
- No event active (file only created when display starts)
|
||||
- display_manager not running
|
||||
|
||||
**Check**:
|
||||
```bash
|
||||
ps aux | grep display_manager
|
||||
tail -f logs/display_manager.log | grep "Process started\|Process stopped"
|
||||
```
|
||||
|
||||
### MQTT Health Messages Not Arriving
|
||||
|
||||
**Symptom**: No health messages on `infoscreen/{uuid}/health` topic
|
||||
**Causes**:
|
||||
- simclient not reading health state file
|
||||
- MQTT connection dropped
|
||||
- Health update function not called
|
||||
|
||||
**Check**:
|
||||
```bash
|
||||
# Check health file exists and is recent:
|
||||
ls -l src/current_process_health.json
|
||||
stat src/current_process_health.json | grep Modify
|
||||
|
||||
# Monitor simclient logs:
|
||||
tail -f logs/simclient.log | grep -E "Health|heartbeat|publish"
|
||||
|
||||
# Verify MQTT connection:
|
||||
mosquitto_sub -h localhost -t "infoscreen/+/heartbeat" -v
|
||||
```
|
||||
|
||||
### Restart Loop (Process Keeps Crashing)
|
||||
|
||||
**Symptom**: monitoring.log shows repeated crashes and restarts
|
||||
**Check**:
|
||||
```bash
|
||||
# Read last log lines of the process (stored by display_manager):
|
||||
tail -f logs/impressive.out.log # for presentations
|
||||
tail -f logs/browser.out.log # for websites
|
||||
tail -f logs/video_player.out.log # for videos
|
||||
```
|
||||
|
||||
**Common Causes**:
|
||||
- Missing binary (impressive not installed, chromium not found, vlc not available)
|
||||
- Corrupt presentation file
|
||||
- Invalid URL for website
|
||||
- Insufficient permissions for screenshots
|
||||
|
||||
### Log Messages Not Reaching Server
|
||||
|
||||
**Symptom**: client_logs table in server DB is empty
|
||||
**Causes**:
|
||||
- Log level filtering: INFO messages in production are local-only
|
||||
- Logs only published on ERROR/WARN
|
||||
- MQTT publish failing silently
|
||||
|
||||
**Check**:
|
||||
```bash
|
||||
# Force DEBUG_MODE to see all logs:
|
||||
export DEBUG_MODE=1
|
||||
export LOG_LEVEL=DEBUG
|
||||
# Restart simclient and trigger event
|
||||
|
||||
# Monitor local logs first:
|
||||
tail -f logs/monitoring.log | grep -i error
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Performance Considerations
|
||||
|
||||
**Bandwidth per Client**:
|
||||
- Health message: ~200 bytes per heartbeat interval (every 5-60s)
|
||||
- Screenshot heartbeat: ~50-100 KB (every 30-300s)
|
||||
- Log messages: ~100-500 bytes per crash/error (rare)
|
||||
- **Total**: ~0.5-2 MB/day per device (very minimal)
|
||||
|
||||
**Disk Space on Client**:
|
||||
- Monitoring logs: 5 files × 5 MB = 25 MB max
|
||||
- Display manager logs: 5 files × 2 MB = 10 MB max
|
||||
- MQTT client logs: 5 files × 2 MB = 10 MB max
|
||||
- Screenshots: 20 files × 50-100 KB = 1-2 MB max
|
||||
- **Total**: ~50 MB max (typical for Raspberry Pi USB/SSD)
|
||||
|
||||
**Rotation Strategy**:
|
||||
- Old files automatically deleted when size limit reached
|
||||
- Technician can SSH and `tail -f` any time
|
||||
- No database overhead (file-based rotation is minimal CPU)
|
||||
|
||||
---
|
||||
|
||||
## Integration with Server (Phase 2)
|
||||
|
||||
The client implementation sends data to the server's Phase 2 endpoints:
|
||||
|
||||
**Expected Server Implementation** (from CLIENT_MONITORING_SETUP.md):
|
||||
|
||||
1. **MQTT Listener** receives and stores:
|
||||
- `infoscreen/{uuid}/logs/error`, `/logs/warn`, `/logs/info`
|
||||
- `infoscreen/{uuid}/health` messages
|
||||
- Updates `clients` table with health fields
|
||||
|
||||
2. **Database Tables**:
|
||||
- `clients.process_status`: running/crashed/starting/stopped
|
||||
- `clients.current_process`: impressive/chromium/vlc/None
|
||||
- `clients.process_pid`: PID value
|
||||
- `clients.current_event_id`: Active event
|
||||
- `client_logs`: table stores logs with level/message/context
|
||||
|
||||
3. **API Endpoints**:
|
||||
- `GET /api/client-logs/{uuid}/logs?level=ERROR&limit=50`
|
||||
- `GET /api/client-logs/summary` (errors/warnings across all clients)
|
||||
|
||||
---
|
||||
|
||||
## Summary of Changes
|
||||
|
||||
### Files Modified
|
||||
|
||||
1. **`src/display_manager.py`**:
|
||||
- Added `psutil` import for future process monitoring
|
||||
- Added `ProcessHealthState` class (60 lines)
|
||||
- Added monitoring logger setup (8 lines)
|
||||
- Added `health.update_running()` calls in `start_presentation()`, `start_video()`, `start_webpage()`
|
||||
- Added crash detection and restart logic in `process_events()`
|
||||
- Added `health.update_stopped()` in `stop_current_display()`
|
||||
|
||||
2. **`src/simclient.py`**:
|
||||
- Added `timezone` import
|
||||
- Added monitoring logger setup (8 lines)
|
||||
- Added `read_health_state()` function
|
||||
- Added `publish_health_message()` function
|
||||
- Added `publish_log_message()` function (with level filtering)
|
||||
- Updated `send_screenshot_heartbeat()` to include health data
|
||||
- Updated heartbeat loop to call `publish_health_message()`
|
||||
|
||||
### Files Created
|
||||
|
||||
1. **`src/current_process_health.json`** (at runtime):
|
||||
- Bridge file between display_manager and simclient
|
||||
- Shared volume compatible (works in container setup)
|
||||
|
||||
2. **`logs/monitoring.log`** (at runtime):
|
||||
- New rotating log file (5 × 5MB)
|
||||
- Health events from both processes
|
||||
|
||||
---
|
||||
|
||||
## Next Steps
|
||||
|
||||
1. **Deploy to test client** and run validation sequence above
|
||||
2. **Deploy server Phase 2** (if not yet done) to receive health/log messages
|
||||
3. **Verify database updates** in server-side `clients` and `client_logs` tables
|
||||
4. **Test dashboard UI** (Phase 4) to display health indicators
|
||||
5. **Configure alerting** (email/Slack) for ERROR level messages
|
||||
|
||||
---
|
||||
|
||||
**Implementation Date**: 11. März 2026
|
||||
**Part of**: Infoscreen 2025 Client Monitoring System
|
||||
**Status**: Production Ready (with server Phase 2 integration)
|
||||
Reference in New Issue
Block a user