overheat monitor with auto poweroff

- needs passwordless sudo on target machine or deploy to run as root
2026-01-25 19:53:43 +09:00
parent 22e9cd2c43
commit 15a805f7fe
9 changed files with 362 additions and 3 deletions
--- a/pi/ui/lib/screens/overheat_screen.dart
+++ b/pi/ui/lib/screens/overheat_screen.dart
@@ -0,0 +1,152 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import '../services/config_service.dart';
+import '../services/pi_io.dart';
+
+/// Overheat warning screen with shutdown countdown
+///
+/// Shows current temp, threshold, and countdown to poweroff.
+/// When countdown hits zero, executes system shutdown.
+class OverheatScreen extends StatefulWidget {
+  const OverheatScreen({super.key});
+
+  @override
+  State<OverheatScreen> createState() => _OverheatScreenState();
+}
+
+class _OverheatScreenState extends State<OverheatScreen> {
+  Timer? _countdownTimer;
+  Timer? _tempRefreshTimer;
+  late int _secondsRemaining;
+  double? _currentTemp;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _secondsRemaining = ConfigService.instance.shutdownDelay.inSeconds;
+    _currentTemp = PiIO.instance.getTemperature();
+
+    // Countdown timer - ticks every second
+    _countdownTimer = Timer.periodic(const Duration(seconds: 1), (_) {
+      setState(() {
+        _secondsRemaining--;
+      });
+
+      if (_secondsRemaining <= 0) {
+        _countdownTimer?.cancel();
+        _executeShutdown();
+      }
+    });
+
+    // Keep temp display updated
+    _tempRefreshTimer = Timer.periodic(const Duration(milliseconds: 500), (_) {
+      setState(() {
+        _currentTemp = PiIO.instance.getTemperature();
+      });
+    });
+  }
+
+  @override
+  void dispose() {
+    _countdownTimer?.cancel();
+    _tempRefreshTimer?.cancel();
+    super.dispose();
+  }
+
+  Future<void> _executeShutdown() async {
+    // Try shutdown commands in order of preference
+    // Requires passwordless sudo for 'shutdown' command (see sudoers note below)
+    final commands = [
+      ['sudo', 'shutdown', '-h', 'now'],
+      ['sudo', 'poweroff'],
+      ['systemctl', 'poweroff'],  // Might work with polkit
+    ];
+
+    for (final cmd in commands) {
+      try {
+        final result = await Process.run(cmd.first, cmd.skip(1).toList());
+        if (result.exitCode == 0) return;  // Success
+      } catch (e) {
+        // Command not found or other error, try next
+      }
+    }
+    // All failed - we're probably not on Linux or no permissions
+    // Pi should have passwordless sudo configured:
+    //   echo "pi ALL=(ALL) NOPASSWD: /sbin/shutdown" | sudo tee /etc/sudoers.d/shutdown
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final threshold = ConfigService.instance.overheatThreshold;
+
+    return Scaffold(
+      backgroundColor: Colors.black,
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            // Warning icon
+            const Icon(
+              Icons.warning_amber_rounded,
+              size: 100,
+              color: Colors.red,
+            ),
+
+            const SizedBox(height: 16),
+
+            // OVERHEATING text
+            const Text(
+              'OVERHEATING',
+              style: TextStyle(
+                fontSize: 48,
+                fontWeight: FontWeight.bold,
+                color: Colors.red,
+                letterSpacing: 4,
+              ),
+            ),
+
+            const SizedBox(height: 48),
+
+            // Current temperature
+            Text(
+              _currentTemp != null ? '${_currentTemp!.toStringAsFixed(1)}°C' : '—',
+              style: const TextStyle(
+                fontSize: 120,
+                fontWeight: FontWeight.w200,
+                color: Colors.white,
+                height: 1,
+              ),
+            ),
+
+            const SizedBox(height: 8),
+
+            // Threshold info
+            Text(
+              'Threshold: ${threshold.toStringAsFixed(0)}°C',
+              style: const TextStyle(
+                fontSize: 24,
+                color: Colors.grey,
+              ),
+            ),
+
+            const SizedBox(height: 48),
+
+            // Countdown
+            Text(
+              'Shutdown in $_secondsRemaining s',
+              style: const TextStyle(
+                fontSize: 32,
+                color: Colors.orange,
+                fontWeight: FontWeight.w500,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}