Argos

All-seeing Flutter APM and HTTP packet capture plugin.

Named after Argus Panoptes, the hundred-eyed giant of Greek myth — Argos watches every request your app makes.

中文文档 · MIT License · Flutter ≥ 3.0

Features

Native HTTP capture — NSURLProtocol on iOS and OkHttp Interceptor on Android, so traffic from native SDKs (not just Dart's HttpClient) is recorded.
Dart HTTP capture — HttpOverrides-based interception for any code paths that flow through dart:io HTTP.
Inspector UI — built-in widget tree (ArgosPacketListPage / ArgosPacketDetailPage) with route grouping, method filter, URL search, runtime capture toggle, and curl reproduction.
Pluggable storage — ArgosStorageAdapter interface lets you back the capture log with MMKV, SharedPreferences, a file, or your own engine.
Dynamic proxy — wire ArgosConfig.proxyProvider to your debug-only proxy gate; replace at runtime.
FPS monitor — opt-in frame-rate sampling via ArgosCapability.fps.
Crash / error capture — opt-in via ArgosCapability.crash. Captures Flutter framework errors (FlutterError.onError) and unhandled Dart async exceptions (PlatformDispatcher.onError), preserving and chaining any handler the host already installed.
Jank analysis — opt-in via ArgosCapability.jank. Detects dropped frames against the display's frame budget, splits build vs. raster time, and aggregates consecutive drops into jank-interval events.
Resource monitor — opt-in via ArgosCapability.resource. Periodically samples process memory (ProcessInfo.currentRss / maxRss). CPU is left empty when not reliably obtainable in pure Dart.

All three are pure-Dart, add no third-party dependencies, and flow through the same ArgosManager.listener callback, storage, and Inspector UI as network captures.

Install

dependencies:
  argos_inspector: ^0.3.1

Quick start

import 'package:argos_inspector/argos_inspector.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  ArgosManager.instance.init(
    config: ArgosConfig(
      apmTypes: [ArgosCapability.network],
      enableStorage: true,
      maxPacketRecords: 200,
    ),
    listener: (ArgosBaseModel? model) {
      debugPrint(model?.getValue());
    },
  );

  // Optional: enable native interception (iOS NSURLProtocol + Android OkHttp)
  ArgosNativeCapture.instance.enable();

  runApp(const MyApp());
}

To open the inspector:

Navigator.push(
  context,
  MaterialPageRoute(builder: (_) => const ArgosPacketListPage()),
);

Storage

ArgosPacketStorage writes through the adapter you supply via ArgosConfig.storageAdapter. Without an adapter, captures are kept in memory only. A reference MMKV-backed adapter lives in the example/ app.

Native interception

ArgosNativeCapture.instance.enable() registers ArgosURLProtocol on iOS and arms the ArgosOkHttpInterceptor on Android. Captures from native HTTP layers stream back through the dev.panoptes.argos/native_capture event channel and merge into the same packet store as Dart-side captures.

Configuration

ArgosConfig(
  apmTypes: [
    ArgosCapability.network,
    ArgosCapability.fps,
    ArgosCapability.crash,
    ArgosCapability.jank,
    ArgosCapability.resource,
  ],
  hostWhiteList: ['api.example.com'],
  enableStorage: true,
  maxPacketRecords: 500,   // retention cap PER non-resource kind (network / crash / jank)
  resourceMaxRecords: 50,  // separate cap for resource samples, so a fast sampler
                           // can never evict a captured crash or request
  storagePersistInterval: const Duration(seconds: 5), // coalesce disk writes;
                           // Duration.zero persists on every write (no loss window)
  proxyProvider: () => kDebugMode ? 'http://127.0.0.1:9091' : null,
  storageAdapter: MyMmkvAdapter(),
  // APM tuning (optional):
  jankThresholdMultiplier: 1.0, // frame is "dropped" when span > budget × this
  resourceSampleInterval: const Duration(seconds: 2),
);

Each capability is independently opt-in — only the entries you list in apmTypes install their handlers/timers. Omitting crash/jank/resource leaves FlutterError.onError, frame callbacks, and sampling untouched. Crash, jank, and resource events appear in the same Inspector list as HTTP packets, tagged with a distinct icon and label (崩溃 / 卡顿 / 资源).

Toggle capture at runtime:

ArgosManager.instance.captureEnabled = false;