104 lines
2.6 KiB
Dart
104 lines
2.6 KiB
Dart
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import 'dart:async';
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import 'package:flutter/foundation.dart';
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class NetworkSpeedMonitor {
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NetworkSpeedMonitor({required this._totalRxBytes, DateTime Function()? now})
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: _now = now ?? DateTime.now;
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final Future<int?> Function() _totalRxBytes;
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final DateTime Function() _now;
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final ValueNotifier<double> speed = ValueNotifier<double>(0);
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final ValueNotifier<bool> available = ValueNotifier<bool>(false);
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Timer? _timer;
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int _lastBytes = 0;
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int? _latestTotalBytes;
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int? get latestTotalBytes => _latestTotalBytes;
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DateTime? _lastSampleAt;
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int _sampleSessionId = 0;
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bool _disposed = false;
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bool _sampleInFlight = false;
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void start() {
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if (_disposed) return;
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_stopActiveSampling(resetValue: true);
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final sessionId = _sampleSessionId;
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_timer = Timer.periodic(const Duration(seconds: 1), (_) {
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if (_disposed || sessionId != _sampleSessionId || _sampleInFlight) {
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return;
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}
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_sampleInFlight = true;
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unawaited(_sample(sessionId));
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});
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}
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void stop() {
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_stopActiveSampling(resetValue: true);
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}
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Future<void> _sample(int sessionId) async {
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try {
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final totalBytes = await _totalRxBytes();
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if (_disposed || sessionId != _sampleSessionId) return;
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if (totalBytes == null) {
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available.value = false;
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speed.value = 0.0;
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return;
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}
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available.value = true;
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final sampled = _sampleSpeedFromTotalBytes(totalBytes);
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if (sampled != null) {
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speed.value = sampled;
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}
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} finally {
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if (!_disposed && sessionId == _sampleSessionId) {
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_sampleInFlight = false;
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}
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}
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}
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double? _sampleSpeedFromTotalBytes(int totalBytes) {
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final now = _now();
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final lastSampleAt = _lastSampleAt;
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final lastBytes = _lastBytes;
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_lastBytes = totalBytes;
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_latestTotalBytes = totalBytes;
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_lastSampleAt = now;
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if (lastSampleAt == null) return null;
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if (totalBytes < lastBytes) return 0.0;
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final elapsedMs = now.difference(lastSampleAt).inMilliseconds;
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final deltaBytes = totalBytes - lastBytes;
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if (elapsedMs <= 0 || deltaBytes <= 0) return 0.0;
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return deltaBytes * 1000.0 / elapsedMs;
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}
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void _stopActiveSampling({required bool resetValue}) {
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_timer?.cancel();
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_timer = null;
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_sampleSessionId++;
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_sampleInFlight = false;
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_lastBytes = 0;
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_latestTotalBytes = null;
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_lastSampleAt = null;
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if (resetValue && !_disposed) {
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available.value = false;
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speed.value = 0;
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}
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}
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void dispose() {
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if (_disposed) return;
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_stopActiveSampling(resetValue: false);
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_disposed = true;
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speed.dispose();
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available.dispose();
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}
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}
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