logd_dio 0.1.3

Seamless Dio HTTP logging interceptor for logd with cURL generation, security redaction, and ambient distributed tracing.

logd_dio

A production-grade Dio HTTP logging interceptor powered by the logd logging engine.

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Features

• Monotonic Latency Measurement: Accurate duration timing via Stopwatch, immune to NTP clock shifts or timezone adjustments.
• Security & Compliance (SOC2 / GDPR): Automatically redacts sensitive tokens, passwords, cookies, and API keys from headers and query parameters.
• cURL Command Generation: Generates copy-pasteable, executable cURL strings for instant terminal or Postman reproduction.
• Payload Safety: Safely previews FormData and binary streams, with configurable body length truncation to prevent out-of-memory crashes on large files.
• Ambient Distributed Tracing: Seamlessly propagates LogContext ambient requestId into outgoing x-request-id headers without parameter passing.
• Cancellation Awareness: Distinguishes user cancellations (CancelToken) from actual network or server errors.

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Quick Start

dependencies:
  dio: ^5.2.0
  logd: ^0.10.2
  logd_dio: ^0.1.2

import 'package:dio/dio.dart';
import 'package:logd/logd.dart';
import 'package:logd_dio/logd_dio.dart';

void main() async {
  // 1. Initialize logd
  Logger.configure('global', handlers: [
    ConsoleHandler(theme: const DarkTheme()),
  ]);

  // 2. Attach the interceptor to Dio
  final dio = Dio();
  dio.interceptors.add(LogdDioInterceptor());

  // 3. Make requests as usual
  await dio.get('https://api.example.com/users');
}

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Configuration Options

Pass LogdDioOptions to customize behavior:

dio.interceptors.add(
  LogdDioInterceptor(
    const LogdDioOptions(
      // Output executable cURL command in request context
      logCurl: true,

      // Truncate payloads longer than 512 characters
      maxBodyLength: 512,

      // Automatically forward LogContext requestId to outgoing headers
      attachAmbientTraceId: true,
      traceIdHeader: 'x-request-id',

      // Custom log levels
      requestLevel: LogLevel.debug,
      responseLevel: LogLevel.info,
      errorLevel: LogLevel.error,
      cancelLevel: LogLevel.debug,

      // Additional sensitive headers to redact
      sensitiveHeaders: {
        ...LogdDioOptions.defaultSensitiveHeaders,
        'x-custom-secret',
      },
    ),
  ),
);

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Ambient Distributed Tracing with LogContext

When wrapping requests inside LogContext.run, LogdDioInterceptor automatically forwards your trace ID to the backend:

await LogContext.run({'requestId': 'req-8891-ab'}, () async {
  // Outgoing request automatically includes 'x-request-id: req-8891-ab'
  await dio.get('https://api.example.com/orders');
});

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Examples & Recipes

The example/ directory provides runnable sample code structured by use case:

Example	Purpose
main.dart	Quick-Start & Basic How-To: Minimal end-to-end integration with Dio, default logging, and basic zone tracing.
showcase_gallery.dart	Interactive Showcase Gallery: CLI launcher to interactively select or run all demos sequentially.
security/sanitization_example.dart	Security & Compliance (SOC2 / GDPR): Custom sensitive headers/query parameters, custom redaction placeholders, payload length truncation, and binary/FormData safety.
tracing/distributed_tracing_example.dart	Distributed Tracing: Ambient context injection (x-correlation-id), trace ID fallbacks, and zone isolation across concurrent asynchronous requests.
resilience/error_and_cancellation_example.dart	Error & Cancellation Handling: Handling user cancellations (CancelToken) quietly as debug logs vs capturing 4xx/5xx failures with status codes and diagnostics.
advanced/custom_pipeline_example.dart	Advanced Tooling: Executable cURL generation, response headers inspection, phase-specific log levels, and dedicated logger routing.

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Monorepo & Documentation

logd_dio is part of the logd monorepo. For deep-dive documentation, architecture, and production recipes, visit:

• logd Monorepo
• Production Cookbook
• API Reference

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License

BSD 3-Clause License. See LICENSE for details.