dio_speed_tracker

A lightweight and extensible Dio interceptor that tracks real-world network download speeds in Mbps, using actual HTTP responses instead of ICMP pings.

This is a practical alternative to custom_ping, ideal for apps where ICMP (ping) is blocked or unreliable — or when you want real-world performance metrics rather than synthetic ones.

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🔍 Features

• ✅ Dio interceptor that measures network speed from actual downloads
• 📉 Emits NetworkStatus.poor when average speed drops below a threshold
• 🔄 Rolling average for smoothing out results
• ⚙️ Configurable sample size, duration, and thresholds
• 🧩 No platform channels or native code needed
• 👌 Suitable for Flutter & Dart web/server apps alike

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📦 Installation

Add this to your pubspec.yaml:

dependencies:
  dio: ^5.0.0
  collection: ^1.17.2
  dio_speed_tracker: ^0.0.3

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🚀 Usage

1. Create and attach the interceptor

final speedController = NetworkSpeedController(
  maxSpeedSamples: 10,
  minResultsToCheck: 5,
  poorConnectionThreshold: 2.0, // Mbps
);

final dio = Dio();

dio.interceptors.add(
  SpeedInterceptor(
  speedController,
  minTrackableSize: 10 * 1024, // 10 KB
  minDuration: Duration(milliseconds: 20),
  ),
);

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2. Listen for connection quality

speedController.stream.listen((status) {
  if (status == NetworkStatus.poor) {
    print("🚨 Poor connection detected!");
    // Optionally show a UI warning or fallback
  }
});

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3. Clean up

Don't forget to dispose of the controller when no longer needed:

@override
void dispose() {
  speedController.dispose();
  super.dispose();
}

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📊 How It Works

• The interceptor uses Dio's onReceiveProgress to measure how long a real HTTP download takes.
• It calculates Mbps based on size and duration.
• Speeds are stored in a rolling buffer, and the average is continuously evaluated.
• When the average falls below the defined threshold, it emits NetworkStatus.poor on the stream.

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🆚 Why Not custom_ping?

Unlike custom_ping:

Feature	dio_speed_tracker	custom_ping
Real download-based speed	✅	❌
Works without ICMP permissions	✅	❌
Cross-platform compatible	✅	🚫 (native)
Dio integration	✅	❌
No extra request calls	✅	❌
Single request evaluation	❌ (TBD)	✅

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🧪 Testing

This package includes full unit test coverage for:

• Speed sample tracking and averaging
• Rolling window logic
• Threshold stream emission
• Basic interceptor setup

Run tests:

flutter test

You’ll find the test files in:

test/
├── network_speed_controller_test.dart
└── speed_interceptor_test.dart

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🧰 Requirements

• Dart 2.17+
• Dio 5+
• collection package for calculating averages

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📂 License

MIT License — free for personal or commercial use.

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🙌 Contributing

Contributions and issues welcome!
If you have improvements or new ideas, feel free to open a PR or start a discussion.

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🔗 Links

• custom_ping on pub.flutter-io.cn — the package this improves upon
• Dio HTTP Client