Gin-Gonic HTTP log forwarder

A Gin-Gonic middleware forwarding access logs over HTTP (in JSON). It can be used for instance to forward all your requests logs to a Fluentd HTTP listener.

Features

• Non blocking: heavy calls made in a goroutine separated from the GIN handler one.
• Possible to log the request & response bodies all the time, when the handler returns an error code (4xx, 5xx) or never
• Memory efficient: uses the standard io library abstractions to limit what's loaded in memory, body logs are truncated to 10000 bytes by default, in case of connection failure with the HTTP endpoint, no more than 1000 logs will be kept in memory. These values can be tweaked to your liking.
• Lightweight but complete

Usage

Like any other Gin-Gonic middleware:

import (
  // ...
  httpLogger "github.com/elafarge/gin-http-logger"
  "github.com/gin-gonic/gin"
  // ...
)

// ...

  r := gin.Default()

	httpLoggerConf := httpLogger.FluentdLoggerConfig{
		Host:           "localhost",
		Port:           13713,
		Env:            "etienne-kubernetes",
		Tag:            "gin.requests",
		BodyLogPolicy:  httpLogger.LOG_BODIES_ON_ERROR,
		MaxBodyLogSize: 50,
		DropSize:       5,
		RetryInterval:  5,
	}

	r.Use(httpLogger.New(httpLoggerConf))

Compatible with

• FluentD (tested)

Author

• Étienne Lafarge etienne@rythm.co