access log

This middleware is used to hertz that logs HTTP request/response details and inspired by logger.

Install

go get github.com/hertz-contrib/logger/accesslog

Example

package main

import (
	"context"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	h := server.Default(
		server.WithHostPorts(":8080"),
	)
	h.Use(accesslog.New())
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

Config

Hertz provides the accesslog.Option function to custom the log format and content.

WithFormat

The accesslog provides WithFormat to help users set the format of the log, default is [${time}] ${status} - ${latency} ${method} ${path}. The format parameter consists of ${tag}, The tag details are as follows Supported tags.

Function signatures:

func WithFormat(s string) Option

Sample Code:

package main

import (
	"context"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	h := server.Default(
		server.WithHostPorts(":8080"),
	)
	h.Use(accesslog.New(accesslog.WithFormat("[${time}] ${status} - ${latency} ${method} ${path} ${queryParams}")))
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

WithTimeFormat

The accesslog provides WithTimeFormat to help users set the format of the time, default is 15:04:05. For specific information, please refer to the time package of go.

Function signatures:

func WithTimeFormat(s string) Option

Sample Code:

package main

import (
	"context"
	"time"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	h := server.Default(
		server.WithHostPorts(":8080"),
	)
	h.Use(accesslog.New(
		accesslog.WithTimeFormat(time.RFC822),
	))
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

WithTimeInterval

The accesslog provides WithTimeInterval to help the user set the update interval of the timestamp, default is 500ms.

Function signatures:

func WithTimeInterval(t time.Duration) Option

Sample Code:

package main

import (
	"context"
	"time"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	h := server.Default(
		server.WithHostPorts(":8080"),
	)
	h.Use(accesslog.New(
		accesslog.WithTimeInterval(time.Second),
	))
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

WithAccessLogFunc

The accesslog provides WithAccessLogFunc to help users set the log printing functions.

Function signatures:

func WithAccessLogFunc(f func(ctx context.Context, format string, v ...interface{})) Option

Sample Code:

package main

import (
	"context"
	
	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/hlog"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	h := server.Default(
		server.WithHostPorts(":8080"),
	)
	h.Use(accesslog.New(
		accesslog.WithAccessLogFunc(hlog.CtxInfof),
	))
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

WithTimeZoneLocation

The accesslog provides WithTimeZoneLocation to help users set the log printing location.

Function signatures:

func WithTimeZoneLocation(loc *time.Location) Option

Sample Code:

package main

import (
	"context"
	
	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/hlog"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	h := server.Default(
		server.WithHostPorts(":8080"),
	)

	location, err := time.LoadLocation("Asia/Shanghai")
	if err != nil {
		return
	}
	h.Use(accesslog.New(
		accesslog.WithTimeZoneLocation(location),
	))
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

Log Format

Default Log Format

[${time}] ${status} - ${latency} ${method} ${path}

example:

[21:54:36] 200 - 2.906859ms GET /ping

Supported tags

tag Introduction
pid pid
time time
referer the referer HTTP request header contains the absolute or partial address from which a resource has been requested
protocol protocol
port port
ip the ip info in Host
ips X-Forwarded-For
host host
method method
path path
url url
ua User-Agent
latency latency
status the status code of response
resBody response body
reqHeaders request headers
resHeaders response headers
queryParams request parameters
body request body
bytesSent the length of response body
bytesReceived the length of request body
route the path of route

Custom Tag

We can add custom tags to the accesslog.Tags, but please note that it is not thread-safe.

Sample Code:

package main

import (
	"context"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/bytebufferpool"
	"github.com/cloudwego/hertz/pkg/common/utils"
	"github.com/hertz-contrib/logger/accesslog"
)

func main() {
	accesslog.Tags["test_tag"] = func(ctx context.Context, c *app.RequestContext, buf *bytebufferpool.ByteBuffer) (int, error) {
		return buf.WriteString("test")
	}
	h := server.Default(
		server.WithHostPorts(":8080"),
	)
	h.Use(accesslog.New(accesslog.WithFormat("${test_tag}")))
	h.GET("/ping", func(ctx context.Context, c *app.RequestContext) {
		c.JSON(200, utils.H{"msg": "pong"})
	})
	h.Spin()
}

Last modified April 4, 2023 : optimzie: custom_tpl docs (#597) (b3e25f4)