78 lines
2.2 KiB
Dart
78 lines
2.2 KiB
Dart
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import 'dart:async';
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import 'config_service.dart';
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import 'pi_io.dart';
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/// Monitors CPU temperature and triggers overheat condition
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///
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/// Singleton pattern. Polls temp at 500ms intervals to match dashboard.
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/// When temp exceeds threshold for trigger duration, fires callback.
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class OverheatMonitor {
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OverheatMonitor._();
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static final instance = OverheatMonitor._();
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Timer? _timer;
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int _consecutiveOverheatSamples = 0;
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bool _triggered = false;
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static const Duration _pollInterval = Duration(milliseconds: 500);
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/// Current temperature (from PiIO cache)
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double? get currentTemp => PiIO.instance.getTemperature();
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/// Whether overheat condition has triggered
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bool get isTriggered => _triggered;
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/// How long we've been over threshold
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Duration get timeOverThreshold =>
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Duration(milliseconds: _consecutiveOverheatSamples * _pollInterval.inMilliseconds);
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/// Start monitoring with callback when overheat triggers
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///
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/// [onOverheat] fires once when temp exceeds threshold for configured duration.
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/// Safe to call multiple times - restarts monitoring.
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void start({required VoidCallback onOverheat}) {
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stop();
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_triggered = false;
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_consecutiveOverheatSamples = 0;
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final threshold = ConfigService.instance.overheatThreshold;
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final triggerDuration = ConfigService.instance.overheatTriggerDuration;
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_timer = Timer.periodic(_pollInterval, (_) {
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if (_triggered) return; // Already fired
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final temp = PiIO.instance.getTemperature();
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if (temp == null) return; // No reading yet
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if (temp > threshold) {
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_consecutiveOverheatSamples++;
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final overThresholdTime = timeOverThreshold;
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if (overThresholdTime >= triggerDuration) {
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_triggered = true;
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onOverheat();
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}
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} else {
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// Temp dropped below threshold - reset counter
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_consecutiveOverheatSamples = 0;
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}
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});
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}
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/// Stop monitoring
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void stop() {
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_timer?.cancel();
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_timer = null;
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}
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/// Reset state (for testing/recovery)
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void reset() {
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_triggered = false;
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_consecutiveOverheatSamples = 0;
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}
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}
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/// Callback signature for void functions
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typedef VoidCallback = void Function();
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