🛰️ API Sentinel

A structured, developer-friendly networking and debugging layer for Flutter.
api_sentinel provides a clean and consistent way to handle API requests, error mapping, and runtime debugging through an on-screen overlay.

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✨ Features

✅ Unified API call interface via ApiService.instance.request()
✅ Customizable callbacks for success, Dio exceptions, and general exceptions
✅ Centralized error handling and message parsing
✅ Floating on-screen debug overlay to visualize requests
✅ Built with dio and get (GetX) for lightweight reactivity
✅ Supports Android, iOS, and Web

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📦 Installation

Add this line to your pubspec.yaml:

dependencies:
  api_sentinel: ^0.0.3

Then run:

flutter pub get

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🧠 Architecture Overview

The library is built around three core layers:

Layer	Description
ApiService	Handles all HTTP requests (GET, POST, PUT, PATCH, DELETE) through Dio.
ErrorHandler	Converts all errors (network, timeout, response, etc.) into readable Failure objects.
DebugOverlay	Shows all ongoing and past requests on top of your UI during runtime (toggleable).

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⚙️ Usage

1️⃣ Initialize the Service

final api = ApiService(baseUrl: 'YOUR_BASE_URL');

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2️⃣ Make a Request

Each request is wrapped with ApiService.instance.request() This ensures that error handling, logging, and overlay integration all happen automatically.

await ApiService.instance.request(
  method: HttpMethod.get,
  url: 'SOME_REQUEST',
  onSuccess: (response) {
    print('✅ Success: ${response.data}');
  },
  onCatchDioException: (error) {
    print('❌ Dio Error: ${handleErrorMessage(error)}');
  },
  onCatchException: (error) {
    print('💥 Exception: ${handleErrorMessage(error)}');
  },
);

This pattern applies to any HTTP method — just change the method and url.

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3️⃣ Supported HTTP Methods

You can use all standard HTTP verbs through the HttpMethod enum:

enum HttpMethod { get, post, put, patch, delete }

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🧩 Error Architecture

Error Type	Source	Failure Example
Connection Timeout	Dio	(-1) Connection timed out
Bad Request	HTTP 400	Bad Request
Unauthorized	HTTP 401	Unauthorized access
Forbidden	HTTP 403	Access denied
Not Found	HTTP 404	Resource not found
Server Error	HTTP 500	Internal server error
Cancelled	Dio CancelToken	Request cancelled
Unknown	Fallback	Something went wrong

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🧰 Debug Overlay

🧊 Floating Draggable Widget

A persistent, draggable button gives quick access to real-time logs.

Stack(
  children: [
    // Your main widget
    MyApp(), 
    // Your debug overlay button
    const DebugOverlayWidget(),
  ]
)

Inside, you’ll see:

• A real-time log list for each request
• Search and filter by method/status code
• Tap any log to expand request/response JSON
• Toggle between Tree View and Pretty JSON
• Click to expand full-screen

🌳 JSON Tree Viewer

Displays structured hierarchical JSON for nested inspection.

🎨 Pretty JSON Viewer

Shows syntax-colored formatted JSON text.

🖥 Full-Screen View

Click the expand icon (🔍) in the corner to open the full JSON view for better readability.

Whenever your app performs an API call through ApiService, it will appear in a floating overlay with:

• Method type (GET/POST/PUT/PATCH/DELETE)
• Status code
• Response time
• Response preview

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🧪 Example Project

A complete example app is included under the example/ directory.

To run it:

cd example
flutter run

It includes a test page with colored buttons for:

• GET
• POST
• PUT
• PATCH
• DELETE
• 404 Error simulation

All using the ApiService and DebugOverlay.

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📚 License

MIT License © 2025 Developed and maintained by Aref Yazdkhasti

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💬 Contribution

Contributions are welcome! If you’d like to improve the debugging UI, extend the ErrorHandler, or support additional APIs, open a PR or issue.

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🧭 Future Plans

• Response caching layer
• Retry strategy for failed requests and 401 unauthenticated request
• Filterable API session logs

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API Sentinel — Because understanding your API should be as clear as your code.