gin

README

Gin Web Framework

Gin is a web framework written in Go (Golang). It features a martini-like API with performance that is up to 40 times faster thanks to httprouter. If you need performance and good productivity, you will love Gin.

Contents

• Installation
• Prerequisite
• Quick start
• Benchmarks
• Gin v1.stable
• Build with jsoniter
• API Examples
  • Using GET,POST,PUT,PATCH,DELETE and OPTIONS
  • Parameters in path
  • Querystring parameters
  • Multipart/Urlencoded Form
  • Another example: query + post form
  • Map as querystring or postform parameters
  • Upload files
  • Grouping routes
  • Blank Gin without middleware by default
  • Using middleware
  • How to write log file
  • Custom Log Format
  • Model binding and validation
  • Custom Validators
  • Only Bind Query String
  • Bind Query String or Post Data
  • Bind Uri
  • Bind Header
  • Bind HTML checkboxes
  • Multipart/Urlencoded binding
  • XML, JSON, YAML and ProtoBuf rendering
  • JSONP rendering
  • Serving static files
  • Serving data from reader
  • HTML rendering
  • Multitemplate
  • Redirects
  • Custom Middleware
  • Using BasicAuth() middleware
  • Goroutines inside a middleware
  • Custom HTTP configuration
  • Support Let's Encrypt
  • Run multiple service using Gin
  • Graceful restart or stop
  • Build a single binary with templates
  • Bind form-data request with custom struct
  • Try to bind body into different structs
  • http2 server push
  • Define format for the log of routes
  • Set and get a cookie
• Testing
• Users

Installation

To install Gin package, you need to install Go and set your Go workspace first.

1. The first need Go installed (version 1.11+ is required), then you can use the below Go command to install Gin.

$ go get -u github.com/gin-gonic/gin

1. Import it in your code:

import "github.com/gin-gonic/gin"

1. (Optional) Import net/http. This is required for example if using constants such as http.StatusOK.

import "net/http"

Quick start

# assume the following codes in example.go file
$ cat example.go

package main

import "github.com/gin-gonic/gin"

func main() {
	r := gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"message": "pong",
		})
	})
	r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
}

# run example.go and visit 0.0.0.0:8080/ping (for windows "localhost:8080/ping") on browser
$ go run example.go

Benchmarks

Gin uses a custom version of HttpRouter

See all benchmarks

Benchmark name	(1)	(2)	(3)	(4)
BenchmarkGin_GithubAll	30000	48375	0	0
BenchmarkAce_GithubAll	10000	134059	13792	167
BenchmarkBear_GithubAll	5000	534445	86448	943
BenchmarkBeego_GithubAll	3000	592444	74705	812
BenchmarkBone_GithubAll	200	6957308	698784	8453
BenchmarkDenco_GithubAll	10000	158819	20224	167
BenchmarkEcho_GithubAll	10000	154700	6496	203
BenchmarkGocraftWeb_GithubAll	3000	570806	131656	1686
BenchmarkGoji_GithubAll	2000	818034	56112	334
BenchmarkGojiv2_GithubAll	2000	1213973	274768	3712
BenchmarkGoJsonRest_GithubAll	2000	785796	134371	2737
BenchmarkGoRestful_GithubAll	300	5238188	689672	4519
BenchmarkGorillaMux_GithubAll	100	10257726	211840	2272
BenchmarkHttpRouter_GithubAll	20000	105414	13792	167
BenchmarkHttpTreeMux_GithubAll	10000	319934	65856	671
BenchmarkKocha_GithubAll	10000	209442	23304	843
BenchmarkLARS_GithubAll	20000	62565	0	0
BenchmarkMacaron_GithubAll	2000	1161270	204194	2000
BenchmarkMartini_GithubAll	200	9991713	226549	2325
BenchmarkPat_GithubAll	200	5590793	1499568	27435
BenchmarkPossum_GithubAll	10000	319768	84448	609
BenchmarkR2router_GithubAll	10000	305134	77328	979
BenchmarkRivet_GithubAll	10000	132134	16272	167
BenchmarkTango_GithubAll	3000	552754	63826	1618
BenchmarkTigerTonic_GithubAll	1000	1439483	239104	5374
BenchmarkTraffic_GithubAll	100	11383067	2659329	21848
BenchmarkVulcan_GithubAll	5000	394253	19894	609

• (1): Total Repetitions achieved in constant time, higher means more confident result
• (2): Single Repetition Duration (ns/op), lower is better
• (3): Heap Memory (B/op), lower is better
• (4): Average Allocations per Repetition (allocs/op), lower is better

Gin v1. stable

• Zero allocation router.
• Still the fastest http router and framework. From routing to writing.
• Complete suite of unit tests
• Battle tested
• API frozen, new releases will not break your code.

Build with jsoniter

Gin uses encoding/json as default json package but you can change to jsoniter by build from other tags.

$ go build -tags=jsoniter .

API Examples

You can find a number of ready-to-run examples at Gin examples repository.

Using GET, POST, PUT, PATCH, DELETE and OPTIONS

func main() {
	// Creates a gin router with default middleware:
	// logger and recovery (crash-free) middleware
	router := gin.Default()

	router.GET("/someGet", getting)
	router.POST("/somePost", posting)
	router.PUT("/somePut", putting)
	router.DELETE("/someDelete", deleting)
	router.PATCH("/somePatch", patching)
	router.HEAD("/someHead", head)
	router.OPTIONS("/someOptions", options)

	// By default it serves on :8080 unless a
	// PORT environment variable was defined.
	router.Run()
	// router.Run(":3000") for a hard coded port
}

Parameters in path

func main() {
	router := gin.Default()

	// This handler will match /user/john but will not match /user/ or /user
	router.GET("/user/:name", func(c *gin.Context) {
		name := c.Param("name")
		c.String(http.StatusOK, "Hello %s", name)
	})

	// However, this one will match /user/john/ and also /user/john/send
	// If no other routers match /user/john, it will redirect to /user/john/
	router.GET("/user/:name/*action", func(c *gin.Context) {
		name := c.Param("name")
		action := c.Param("action")
		message := name + " is " + action
		c.String(http.StatusOK, message)
	})

	// For each matched request Context will hold the route definition
	router.POST("/user/:name/*action", func(c *gin.Context) {
		c.FullPath() == "/user/:name/*action" // true
	})

	router.Run(":8080")
}

Querystring parameters

func main() {
	router := gin.Default()

	// Query string parameters are parsed using the existing underlying request object.
	// The request responds to a url matching:  /welcome?firstname=Jane&lastname=Doe
	router.GET("/welcome", func(c *gin.Context) {
		firstname := c.DefaultQuery("firstname", "Guest")
		lastname := c.Query("lastname") // shortcut for c.Request.URL.Query().Get("lastname")

		c.String(http.StatusOK, "Hello %s %s", firstname, lastname)
	})
	router.Run(":8080")
}

Multipart/Urlencoded Form

func main() {
	router := gin.Default()

	router.POST("/form_post", func(c *gin.Context) {
		message := c.PostForm("message")
		nick := c.DefaultPostForm("nick", "anonymous")

		c.JSON(200, gin.H{
			"status":  "posted",
			"message": message,
			"nick":    nick,
		})
	})
	router.Run(":8080")
}

Another example: query + post form

POST /post?id=1234&page=1 HTTP/1.1
Content-Type: application/x-www-form-urlencoded

name=manu&message=this_is_great

func main() {
	router := gin.Default()

	router.POST("/post", func(c *gin.Context) {

		id := c.Query("id")
		page := c.DefaultQuery("page", "0")
		name := c.PostForm("name")
		message := c.PostForm("message")

		fmt.Printf("id: %s; page: %s; name: %s; message: %s", id, page, name, message)
	})
	router.Run(":8080")
}

id: 1234; page: 1; name: manu; message: this_is_great

Map as querystring or postform parameters

POST /post?ids[a]=1234&ids[b]=hello HTTP/1.1
Content-Type: application/x-www-form-urlencoded

names[first]=thinkerou&names[second]=tianou

func main() {
	router := gin.Default()

	router.POST("/post", func(c *gin.Context) {

		ids := c.QueryMap("ids")
		names := c.PostFormMap("names")

		fmt.Printf("ids: %v; names: %v", ids, names)
	})
	router.Run(":8080")
}

ids: map[b:hello a:1234], names: map[second:tianou first:thinkerou]

Upload files

Single file

References issue #774 and detail example code.

file.Filename SHOULD NOT be trusted. See Content-Disposition on MDN and #1693

The filename is always optional and must not be used blindly by the application: path information should be stripped, and conversion to the server file system rules should be done.

func main() {
	router := gin.Default()
	// Set a lower memory limit for multipart forms (default is 32 MiB)
	// router.MaxMultipartMemory = 8 << 20  // 8 MiB
	router.POST("/upload", func(c *gin.Context) {
		// single file
		file, _ := c.FormFile("file")
		log.Println(file.Filename)

		// Upload the file to specific dst.
		// c.SaveUploadedFile(file, dst)

		c.String(http.StatusOK, fmt.Sprintf("'%s' uploaded!", file.Filename))
	})
	router.Run(":8080")
}

How to curl:

curl -X POST http://localhost:8080/upload \
  -F "file=@/Users/appleboy/test.zip" \
  -H "Content-Type: multipart/form-data"

Multiple files

See the detail example code.

func main() {
	router := gin.Default()
	// Set a lower memory limit for multipart forms (default is 32 MiB)
	// router.MaxMultipartMemory = 8 << 20  // 8 MiB
	router.POST("/upload", func(c *gin.Context) {
		// Multipart form
		form, _ := c.MultipartForm()
		files := form.File["upload[]"]

		for _, file := range files {
			log.Println(file.Filename)

			// Upload the file to specific dst.
			// c.SaveUploadedFile(file, dst)
		}
		c.String(http.StatusOK, fmt.Sprintf("%d files uploaded!", len(files)))
	})
	router.Run(":8080")
}

How to curl:

curl -X POST http://localhost:8080/upload \
  -F "upload[]=@/Users/appleboy/test1.zip" \
  -F "upload[]=@/Users/appleboy/test2.zip" \
  -H "Content-Type: multipart/form-data"

Grouping routes

func main() {
	router := gin.Default()

	// Simple group: v1
	v1 := router.Group("/v1")
	{
		v1.POST("/login", loginEndpoint)
		v1.POST("/submit", submitEndpoint)
		v1.POST("/read", readEndpoint)
	}

	// Simple group: v2
	v2 := router.Group("/v2")
	{
		v2.POST("/login", loginEndpoint)
		v2.POST("/submit", submitEndpoint)
		v2.POST("/read", readEndpoint)
	}

	router.Run(":8080")
}

Blank Gin without middleware by default

Use

r := gin.New()

instead of

// Default With the Logger and Recovery middleware already attached
r := gin.Default()

Using middleware

func main() {
	// Creates a router without any middleware by default
	r := gin.New()

	// Global middleware
	// Logger middleware will write the logs to gin.DefaultWriter even if you set with GIN_MODE=release.
	// By default gin.DefaultWriter = os.Stdout
	r.Use(gin.Logger())

	// Recovery middleware recovers from any panics and writes a 500 if there was one.
	r.Use(gin.Recovery())

	// Per route middleware, you can add as many as you desire.
	r.GET("/benchmark", MyBenchLogger(), benchEndpoint)

	// Authorization group
	// authorized := r.Group("/", AuthRequired())
	// exactly the same as:
	authorized := r.Group("/")
	// per group middleware! in this case we use the custom created
	// AuthRequired() middleware just in the "authorized" group.
	authorized.Use(AuthRequired())
	{
		authorized.POST("/login", loginEndpoint)
		authorized.POST("/submit", submitEndpoint)
		authorized.POST("/read", readEndpoint)

		// nested group
		testing := authorized.Group("testing")
		testing.GET("/analytics", analyticsEndpoint)
	}

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

How to write log file

func main() {
    // Disable Console Color, you don't need console color when writing the logs to file.
    gin.DisableConsoleColor()

    // Logging to a file.
    f, _ := os.Create("gin.log")
    gin.DefaultWriter = io.MultiWriter(f)

    // Use the following code if you need to write the logs to file and console at the same time.
    // gin.DefaultWriter = io.MultiWriter(f, os.Stdout)

    router := gin.Default()
    router.GET("/ping", func(c *gin.Context) {
        c.String(200, "pong")
    })

    router.Run(":8080")
}

Custom Log Format

func main() {
	router := gin.New()

	// LoggerWithFormatter middleware will write the logs to gin.DefaultWriter
	// By default gin.DefaultWriter = os.Stdout
	router.Use(gin.LoggerWithFormatter(func(param gin.LogFormatterParams) string {

		// your custom format
		return fmt.Sprintf("%s - [%s] \"%s %s %s %d %s \"%s\" %s\"\n",
				param.ClientIP,
				param.TimeStamp.Format(time.RFC1123),
				param.Method,
				param.Path,
				param.Request.Proto,
				param.StatusCode,
				param.Latency,
				param.Request.UserAgent(),
				param.ErrorMessage,
		)
	}))
	router.Use(gin.Recovery())

	router.GET("/ping", func(c *gin.Context) {
		c.String(200, "pong")
	})

	router.Run(":8080")
}

Sample Output

::1 - [Fri, 07 Dec 2018 17:04:38 JST] "GET /ping HTTP/1.1 200 122.767µs "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36" "

Controlling Log output coloring

By default, logs output on console should be colorized depending on the detected TTY.

Never colorize logs:

func main() {
    // Disable log's color
    gin.DisableConsoleColor()
    
    // Creates a gin router with default middleware:
    // logger and recovery (crash-free) middleware
    router := gin.Default()
    
    router.GET("/ping", func(c *gin.Context) {
        c.String(200, "pong")
    })
    
    router.Run(":8080")
}

Always colorize logs:

func main() {
    // Force log's color
    gin.ForceConsoleColor()
    
    // Creates a gin router with default middleware:
    // logger and recovery (crash-free) middleware
    router := gin.Default()
    
    router.GET("/ping", func(c *gin.Context) {
        c.String(200, "pong")
    })
    
    router.Run(":8080")
}

Model binding and validation

To bind a request body into a type, use model binding. We currently support binding of JSON, XML, YAML and standard form values (foo=bar&boo=baz).

Gin uses go-playground/validator.v8 for validation. Check the full docs on tags usage here.

Note that you need to set the corresponding binding tag on all fields you want to bind. For example, when binding from JSON, set json:"fieldname".

Also, Gin provides two sets of methods for binding:

• Type - Must bind
  • Methods - Bind, BindJSON, BindXML, BindQuery, BindYAML, BindHeader
  • Behavior - These methods use MustBindWith under the hood. If there is a binding error, the request is aborted with c.AbortWithError(400, err).SetType(ErrorTypeBind). This sets the response status code to 400 and the Content-Type header is set to text/plain; charset=utf-8. Note that if you try to set the response code after this, it will result in a warning [GIN-debug] [WARNING] Headers were already written. Wanted to override status code 400 with 422. If you wish to have greater control over the behavior, consider using the ShouldBind equivalent method.
• Type - Should bind
  • Methods - ShouldBind, ShouldBindJSON, ShouldBindXML, ShouldBindQuery, ShouldBindYAML, ShouldBindHeader
  • Behavior - These methods use ShouldBindWith under the hood. If there is a binding error, the error is returned and it is the developer's responsibility to handle the request and error appropriately.

When using the Bind-method, Gin tries to infer the binder depending on the Content-Type header. If you are sure what you are binding, you can use MustBindWith or ShouldBindWith.

You can also specify that specific fields are required. If a field is decorated with binding:"required" and has a empty value when binding, an error will be returned.

// Binding from JSON
type Login struct {
	User     string `form:"user" json:"user" xml:"user"  binding:"required"`
	Password string `form:"password" json:"password" xml:"password" binding:"required"`
}

func main() {
	router := gin.Default()

	// Example for binding JSON ({"user": "manu", "password": "123"})
	router.POST("/loginJSON", func(c *gin.Context) {
		var json Login
		if err := c.ShouldBindJSON(&json); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		
		if json.User != "manu" || json.Password != "123" {
			c.JSON(http.StatusUnauthorized, gin.H{"status": "unauthorized"})
			return
		} 
		
		c.JSON(http.StatusOK, gin.H{"status": "you are logged in"})
	})

	// Example for binding XML (
	//	<?xml version="1.0" encoding="UTF-8"?>
	//	<root>
	//		<user>user</user>
	//		<password>123</password>
	//	</root>)
	router.POST("/loginXML", func(c *gin.Context) {
		var xml Login
		if err := c.ShouldBindXML(&xml); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		
		if xml.User != "manu" || xml.Password != "123" {
			c.JSON(http.StatusUnauthorized, gin.H{"status": "unauthorized"})
			return
		} 
		
		c.JSON(http.StatusOK, gin.H{"status": "you are logged in"})
	})

	// Example for binding a HTML form (user=manu&password=123)
	router.POST("/loginForm", func(c *gin.Context) {
		var form Login
		// This will infer what binder to use depending on the content-type header.
		if err := c.ShouldBind(&form); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		
		if form.User != "manu" || form.Password != "123" {
			c.JSON(http.StatusUnauthorized, gin.H{"status": "unauthorized"})
			return
		} 
		
		c.JSON(http.StatusOK, gin.H{"status": "you are logged in"})
	})

	// Listen and serve on 0.0.0.0:8080
	router.Run(":8080")
}

Sample request

$ curl -v -X POST \
  http://localhost:8080/loginJSON \
  -H 'content-type: application/json' \
  -d '{ "user": "manu" }'
> POST /loginJSON HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.51.0
> Accept: */*
> content-type: application/json
> Content-Length: 18
>
* upload completely sent off: 18 out of 18 bytes
< HTTP/1.1 400 Bad Request
< Content-Type: application/json; charset=utf-8
< Date: Fri, 04 Aug 2017 03:51:31 GMT
< Content-Length: 100
<
{"error":"Key: 'Login.Password' Error:Field validation for 'Password' failed on the 'required' tag"}

Skip validate

When running the above example using the above the curl command, it returns error. Because the example use binding:"required" for Password. If use binding:"-" for Password, then it will not return error when running the above example again.

Custom Validators

It is also possible to register custom validators. See the example code.

package main

import (
	"net/http"
	"reflect"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"gopkg.in/go-playground/validator.v8"
)

// Booking contains binded and validated data.
type Booking struct {
	CheckIn  time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
	CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn" time_format:"2006-01-02"`
}

func bookableDate(
	v *validator.Validate, topStruct reflect.Value, currentStructOrField reflect.Value,
	field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string,
) bool {
	if date, ok := field.Interface().(time.Time); ok {
		today := time.Now()
		if today.After(date) {
			return false
		}
	}
	return true
}

func main() {
	route := gin.Default()

	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
		v.RegisterValidation("bookabledate", bookableDate)
	}

	route.GET("/bookable", getBookable)
	route.Run(":8085")
}

func getBookable(c *gin.Context) {
	var b Booking
	if err := c.ShouldBindWith(&b, binding.Query); err == nil {
		c.JSON(http.StatusOK, gin.H{"message": "Booking dates are valid!"})
	} else {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
	}
}

$ curl "localhost:8085/bookable?check_in=2018-04-16&check_out=2018-04-17"
{"message":"Booking dates are valid!"}

$ curl "localhost:8085/bookable?check_in=2018-03-08&check_out=2018-03-09"
{"error":"Key: 'Booking.CheckIn' Error:Field validation for 'CheckIn' failed on the 'bookabledate' tag"}

Struct level validations can also be registered this way. See the struct-lvl-validation example to learn more.

Only Bind Query String

ShouldBindQuery function only binds the query params and not the post data. See the detail information.

package main

import (
	"log"

	"github.com/gin-gonic/gin"
)

type Person struct {
	Name    string `form:"name"`
	Address string `form:"address"`
}

func main() {
	route := gin.Default()
	route.Any("/testing", startPage)
	route.Run(":8085")
}

func startPage(c *gin.Context) {
	var person Person
	if c.ShouldBindQuery(&person) == nil {
		log.Println("====== Only Bind By Query String ======")
		log.Println(person.Name)
		log.Println(person.Address)
	}
	c.String(200, "Success")
}

Bind Query String or Post Data

See the detail information.

package main

import (
	"log"
	"time"

	"github.com/gin-gonic/gin"
)

type Person struct {
        Name       string    `form:"name"`
        Address    string    `form:"address"`
        Birthday   time.Time `form:"birthday" time_format:"2006-01-02" time_utc:"1"`
        CreateTime time.Time `form:"createTime" time_format:"unixNano"`
        UnixTime   time.Time `form:"unixTime" time_format:"unix"`
}

func main() {
	route := gin.Default()
	route.GET("/testing", startPage)
	route.Run(":8085")
}

func startPage(c *gin.Context) {
	var person Person
	// If `GET`, only `Form` binding engine (`query`) used.
	// If `POST`, first checks the `content-type` for `JSON` or `XML`, then uses `Form` (`form-data`).
	// See more at https://github.com/gin-gonic/gin/blob/master/binding/binding.go#L48
        if c.ShouldBind(&person) == nil {
                log.Println(person.Name)
                log.Println(person.Address)
                log.Println(person.Birthday)
                log.Println(person.CreateTime)
                log.Println(person.UnixTime)
        }

	c.String(200, "Success")
}

Test it with:

$ curl -X GET "localhost:8085/testing?name=appleboy&address=xyz&birthday=1992-03-15&createTime=1562400033000000123&unixTime=1562400033"

Bind Uri

See the detail information.

package main

import "github.com/gin-gonic/gin"

type Person struct {
	ID string `uri:"id" binding:"required,uuid"`
	Name string `uri:"name" binding:"required"`
}

func main() {
	route := gin.Default()
	route.GET("/:name/:id", func(c *gin.Context) {
		var person Person
		if err := c.ShouldBindUri(&person); err != nil {
			c.JSON(400, gin.H{"msg": err})
			return
		}
		c.JSON(200, gin.H{"name": person.Name, "uuid": person.ID})
	})
	route.Run(":8088")
}

Test it with:

$ curl -v localhost:8088/thinkerou/987fbc97-4bed-5078-9f07-9141ba07c9f3
$ curl -v localhost:8088/thinkerou/not-uuid

Bind Header

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
)

type testHeader struct {
	Rate   int    `header:"Rate"`
	Domain string `header:"Domain"`
}

func main() {
	r := gin.Default()
	r.GET("/", func(c *gin.Context) {
		h := testHeader{}

		if err := c.ShouldBindHeader(&h); err != nil {
			c.JSON(200, err)
		}

		fmt.Printf("%#v\n", h)
		c.JSON(200, gin.H{"Rate": h.Rate, "Domain": h.Domain})
	})

	r.Run()

// client
// curl -H "rate:300" -H "domain:music" 127.0.0.1:8080/
// output
// {"Domain":"music","Rate":300}
}

Bind HTML checkboxes

See the detail information

main.go

...

type myForm struct {
    Colors []string `form:"colors[]"`
}

...

func formHandler(c *gin.Context) {
    var fakeForm myForm
    c.ShouldBind(&fakeForm)
    c.JSON(200, gin.H{"color": fakeForm.Colors})
}

...

form.html

<form action="/" method="POST">
    <p>Check some colors</p>
    <label for="red">Red</label>
    <input type="checkbox" name="colors[]" value="red" id="red">
    <label for="green">Green</label>
    <input type="checkbox" name="colors[]" value="green" id="green">
    <label for="blue">Blue</label>
    <input type="checkbox" name="colors[]" value="blue" id="blue">
    <input type="submit">
</form>

result:

{"color":["red","green","blue"]}

Multipart/Urlencoded binding

type ProfileForm struct {
	Name   string                `form:"name" binding:"required"`
	Avatar *multipart.FileHeader `form:"avatar" binding:"required"`

	// or for multiple files
	// Avatars []*multipart.FileHeader `form:"avatar" binding:"required"`
}

func main() {
	router := gin.Default()
	router.POST("/profile", func(c *gin.Context) {
		// you can bind multipart form with explicit binding declaration:
		// c.ShouldBindWith(&form, binding.Form)
		// or you can simply use autobinding with ShouldBind method:
		var form ProfileForm
		// in this case proper binding will be automatically selected
		if err := c.ShouldBind(&form); err != nil {
			c.String(http.StatusBadRequest, "bad request")
			return
		}

		err := c.SaveUploadedFile(form.Avatar, form.Avatar.Filename)
		if err != nil {
			c.String(http.StatusInternalServerError, "unknown error")
			return
		}

		// db.Save(&form)

		c.String(http.StatusOK, "ok")
	})
	router.Run(":8080")
}

Test it with:

$ curl -X POST -v --form name=user --form "avatar=@./avatar.png" http://localhost:8080/profile

XML, JSON, YAML and ProtoBuf rendering

func main() {
	r := gin.Default()

	// gin.H is a shortcut for map[string]interface{}
	r.GET("/someJSON", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK})
	})

	r.GET("/moreJSON", func(c *gin.Context) {
		// You also can use a struct
		var msg struct {
			Name    string `json:"user"`
			Message string
			Number  int
		}
		msg.Name = "Lena"
		msg.Message = "hey"
		msg.Number = 123
		// Note that msg.Name becomes "user" in the JSON
		// Will output  :   {"user": "Lena", "Message": "hey", "Number": 123}
		c.JSON(http.StatusOK, msg)
	})

	r.GET("/someXML", func(c *gin.Context) {
		c.XML(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK})
	})

	r.GET("/someYAML", func(c *gin.Context) {
		c.YAML(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK})
	})

	r.GET("/someProtoBuf", func(c *gin.Context) {
		reps := []int64{int64(1), int64(2)}
		label := "test"
		// The specific definition of protobuf is written in the testdata/protoexample file.
		data := &protoexample.Test{
			Label: &label,
			Reps:  reps,
		}
		// Note that data becomes binary data in the response
		// Will output protoexample.Test protobuf serialized data
		c.ProtoBuf(http.StatusOK, data)
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

SecureJSON

Using SecureJSON to prevent json hijacking. Default prepends "while(1)," to response body if the given struct is array values.

func main() {
	r := gin.Default()

	// You can also use your own secure json prefix
	// r.SecureJsonPrefix(")]}',\n")

	r.GET("/someJSON", func(c *gin.Context) {
		names := []string{"lena", "austin", "foo"}

		// Will output  :   while(1);["lena","austin","foo"]
		c.SecureJSON(http.StatusOK, names)
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

JSONP

Using JSONP to request data from a server in a different domain. Add callback to response body if the query parameter callback exists.

func main() {
	r := gin.Default()

	r.GET("/JSONP", func(c *gin.Context) {
		data := gin.H{
			"foo": "bar",
		}
		
		//callback is x
		// Will output  :   x({\"foo\":\"bar\"})
		c.JSONP(http.StatusOK, data)
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")

        // client
        // curl http://127.0.0.1:8080/JSONP?callback=x
}

AsciiJSON

Using AsciiJSON to Generates ASCII-only JSON with escaped non-ASCII characters.

func main() {
	r := gin.Default()

	r.GET("/someJSON", func(c *gin.Context) {
		data := gin.H{
			"lang": "GO语言",
			"tag":  "<br>",
		}

		// will output : {"lang":"GO\u8bed\u8a00","tag":"\u003cbr\u003e"}
		c.AsciiJSON(http.StatusOK, data)
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

PureJSON

Normally, JSON replaces special HTML characters with their unicode entities, e.g. < becomes \u003c. If you want to encode such characters literally, you can use PureJSON instead. This feature is unavailable in Go 1.6 and lower.

func main() {
	r := gin.Default()
	
	// Serves unicode entities
	r.GET("/json", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"html": "<b>Hello, world!</b>",
		})
	})
	
	// Serves literal characters
	r.GET("/purejson", func(c *gin.Context) {
		c.PureJSON(200, gin.H{
			"html": "<b>Hello, world!</b>",
		})
	})
	
	// listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

Serving static files

func main() {
	router := gin.Default()
	router.Static("/assets", "./assets")
	router.StaticFS("/more_static", http.Dir("my_file_system"))
	router.StaticFile("/favicon.ico", "./resources/favicon.ico")

	// Listen and serve on 0.0.0.0:8080
	router.Run(":8080")
}

Serving data from reader

func main() {
	router := gin.Default()
	router.GET("/someDataFromReader", func(c *gin.Context) {
		response, err := http.Get("https://raw.githubusercontent.com/gin-gonic/logo/master/color.png")
		if err != nil || response.StatusCode != http.StatusOK {
			c.Status(http.StatusServiceUnavailable)
			return
		}

		reader := response.Body
		contentLength := response.ContentLength
		contentType := response.Header.Get("Content-Type")

		extraHeaders := map[string]string{
			"Content-Disposition": `attachment; filename="gopher.png"`,
		}

		c.DataFromReader(http.StatusOK, contentLength, contentType, reader, extraHeaders)
	})
	router.Run(":8080")
}

HTML rendering

Using LoadHTMLGlob() or LoadHTMLFiles()

func main() {
	router := gin.Default()
	router.LoadHTMLGlob("templates/*")
	//router.LoadHTMLFiles("templates/template1.html", "templates/template2.html")
	router.GET("/index", func(c *gin.Context) {
		c.HTML(http.StatusOK, "index.tmpl", gin.H{
			"title": "Main website",
		})
	})
	router.Run(":8080")
}

templates/index.tmpl

<html>
	<h1>
		{{ .title }}
	</h1>
</html>

Using templates with same name in different directories

func main() {
	router := gin.Default()
	router.LoadHTMLGlob("templates/**/*")
	router.GET("/posts/index", func(c *gin.Context) {
		c.HTML(http.StatusOK, "posts/index.tmpl", gin.H{
			"title": "Posts",
		})
	})
	router.GET("/users/index", func(c *gin.Context) {
		c.HTML(http.StatusOK, "users/index.tmpl", gin.H{
			"title": "Users",
		})
	})
	router.Run(":8080")
}

templates/posts/index.tmpl

{{ define "posts/index.tmpl" }}
<html><h1>
	{{ .title }}
</h1>
<p>Using posts/index.tmpl</p>
</html>
{{ end }}

templates/users/index.tmpl

{{ define "users/index.tmpl" }}
<html><h1>
	{{ .title }}
</h1>
<p>Using users/index.tmpl</p>
</html>
{{ end }}

Custom Template renderer

You can also use your own html template render

import "html/template"

func main() {
	router := gin.Default()
	html := template.Must(template.ParseFiles("file1", "file2"))
	router.SetHTMLTemplate(html)
	router.Run(":8080")
}

Custom Delimiters

You may use custom delims

	r := gin.Default()
	r.Delims("{[{", "}]}")
	r.LoadHTMLGlob("/path/to/templates")

Custom Template Funcs

See the detail example code.

main.go

import (
    "fmt"
    "html/template"
    "net/http"
    "time"

    "github.com/gin-gonic/gin"
)

func formatAsDate(t time.Time) string {
    year, month, day := t.Date()
    return fmt.Sprintf("%d%02d/%02d", year, month, day)
}

func main() {
    router := gin.Default()
    router.Delims("{[{", "}]}")
    router.SetFuncMap(template.FuncMap{
        "formatAsDate": formatAsDate,
    })
    router.LoadHTMLFiles("./testdata/template/raw.tmpl")

    router.GET("/raw", func(c *gin.Context) {
        c.HTML(http.StatusOK, "raw.tmpl", gin.H{
            "now": time.Date(2017, 07, 01, 0, 0, 0, 0, time.UTC),
        })
    })

    router.Run(":8080")
}

raw.tmpl

Date: {[{.now | formatAsDate}]}

Result:

Date: 2017/07/01

Multitemplate

Gin allow by default use only one html.Template. Check a multitemplate render for using features like go 1.6 block template.

Redirects

Issuing a HTTP redirect is easy. Both internal and external locations are supported.

r.GET("/test", func(c *gin.Context) {
	c.Redirect(http.StatusMovedPermanently, "http://www.google.com/")
})

Issuing a Router redirect, use HandleContext like below.

r.GET("/test", func(c *gin.Context) {
    c.Request.URL.Path = "/test2"
    r.HandleContext(c)
})
r.GET("/test2", func(c *gin.Context) {
    c.JSON(200, gin.H{"hello": "world"})
})

Custom Middleware

func Logger() gin.HandlerFunc {
	return func(c *gin.Context) {
		t := time.Now()

		// Set example variable
		c.Set("example", "12345")

		// before request

		c.Next()

		// after request
		latency := time.Since(t)
		log.Print(latency)

		// access the status we are sending
		status := c.Writer.Status()
		log.Println(status)
	}
}

func main() {
	r := gin.New()
	r.Use(Logger())

	r.GET("/test", func(c *gin.Context) {
		example := c.MustGet("example").(string)

		// it would print: "12345"
		log.Println(example)
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

Using BasicAuth() middleware

// simulate some private data
var secrets = gin.H{
	"foo":    gin.H{"email": "foo@bar.com", "phone": "123433"},
	"austin": gin.H{"email": "austin@example.com", "phone": "666"},
	"lena":   gin.H{"email": "lena@guapa.com", "phone": "523443"},
}

func main() {
	r := gin.Default()

	// Group using gin.BasicAuth() middleware
	// gin.Accounts is a shortcut for map[string]string
	authorized := r.Group("/admin", gin.BasicAuth(gin.Accounts{
		"foo":    "bar",
		"austin": "1234",
		"lena":   "hello2",
		"manu":   "4321",
	}))

	// /admin/secrets endpoint
	// hit "localhost:8080/admin/secrets
	authorized.GET("/secrets", func(c *gin.Context) {
		// get user, it was set by the BasicAuth middleware
		user := c.MustGet(gin.AuthUserKey).(string)
		if secret, ok := secrets[user]; ok {
			c.JSON(http.StatusOK, gin.H{"user": user, "secret": secret})
		} else {
			c.JSON(http.StatusOK, gin.H{"user": user, "secret": "NO SECRET :("})
		}
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

Goroutines inside a middleware

When starting new Goroutines inside a middleware or handler, you SHOULD NOT use the original context inside it, you have to use a read-only copy.

func main() {
	r := gin.Default()

	r.GET("/long_async", func(c *gin.Context) {
		// create copy to be used inside the goroutine
		cCp := c.Copy()
		go func() {
			// simulate a long task with time.Sleep(). 5 seconds
			time.Sleep(5 * time.Second)

			// note that you are using the copied context "cCp", IMPORTANT
			log.Println("Done! in path " + cCp.Request.URL.Path)
		}()
	})

	r.GET("/long_sync", func(c *gin.Context) {
		// simulate a long task with time.Sleep(). 5 seconds
		time.Sleep(5 * time.Second)

		// since we are NOT using a goroutine, we do not have to copy the context
		log.Println("Done! in path " + c.Request.URL.Path)
	})

	// Listen and serve on 0.0.0.0:8080
	r.Run(":8080")
}

Custom HTTP configuration

Use http.ListenAndServe() directly, like this:

func main() {
	router := gin.Default()
	http.ListenAndServe(":8080", router)
}

or

func main() {
	router := gin.Default()

	s := &http.Server{
		Addr:           ":8080",
		Handler:        router,
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}
	s.ListenAndServe()
}

Support Let's Encrypt

example for 1-line LetsEncrypt HTTPS servers.

package main

import (
	"log"

	"github.com/gin-gonic/autotls"
	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()

	// Ping handler
	r.GET("/ping", func(c *gin.Context) {
		c.String(200, "pong")
	})

	log.Fatal(autotls.Run(r, "example1.com", "example2.com"))
}

example for custom autocert manager.

package main

import (
	"log"

	"github.com/gin-gonic/autotls"
	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/acme/autocert"
)

func main() {
	r := gin.Default()

	// Ping handler
	r.GET("/ping", func(c *gin.Context) {
		c.String(200, "pong")
	})

	m := autocert.Manager{
		Prompt:     autocert.AcceptTOS,
		HostPolicy: autocert.HostWhitelist("example1.com", "example2.com"),
		Cache:      autocert.DirCache("/var/www/.cache"),
	}

	log.Fatal(autotls.RunWithManager(r, &m))
}

Run multiple service using Gin

See the question and try the following example:

package main

import (
	"log"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"golang.org/x/sync/errgroup"
)

var (
	g errgroup.Group
)

func router01() http.Handler {
	e := gin.New()
	e.Use(gin.Recovery())
	e.GET("/", func(c *gin.Context) {
		c.JSON(
			http.StatusOK,
			gin.H{
				"code":  http.StatusOK,
				"error": "Welcome server 01",
			},
		)
	})

	return e
}

func router02() http.Handler {
	e := gin.New()
	e.Use(gin.Recovery())
	e.GET("/", func(c *gin.Context) {
		c.JSON(
			http.StatusOK,
			gin.H{
				"code":  http.StatusOK,
				"error": "Welcome server 02",
			},
		)
	})

	return e
}

func main() {
	server01 := &http.Server{
		Addr:         ":8080",
		Handler:      router01(),
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	server02 := &http.Server{
		Addr:         ":8081",
		Handler:      router02(),
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	g.Go(func() error {
		err := server01.ListenAndServe()
		if err != nil && err != http.ErrServerClosed {
			log.Fatal(err)
		}
		return err
	})

	g.Go(func() error {
		err := server02.ListenAndServe()
		if err != nil && err != http.ErrServerClosed {
			log.Fatal(err)
		}
		return err
	})

	if err := g.Wait(); err != nil {
		log.Fatal(err)
	}
}

Graceful restart or stop

Do you want to graceful restart or stop your web server? There are some ways this can be done.

We can use fvbock/endless to replace the default ListenAndServe. Refer issue #296 for more details.

router := gin.Default()
router.GET("/", handler)
// [...]
endless.ListenAndServe(":4242", router)

An alternative to endless:

• manners: A polite Go HTTP server that shuts down gracefully.
• graceful: Graceful is a Go package enabling graceful shutdown of an http.Handler server.
• grace: Graceful restart & zero downtime deploy for Go servers.

If you are using Go 1.8, you may not need to use this library! Consider using http.Server's built-in Shutdown() method for graceful shutdowns. See the full graceful-shutdown example with gin.

// +build go1.8

package main

import (
	"context"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/gin-gonic/gin"
)

func main() {
	router := gin.Default()
	router.GET("/", func(c *gin.Context) {
		time.Sleep(5 * time.Second)
		c.String(http.StatusOK, "Welcome Gin Server")
	})

	srv := &http.Server{
		Addr:    ":8080",
		Handler: router,
	}

	go func() {
		// service connections
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()

	// Wait for interrupt signal to gracefully shutdown the server with
	// a timeout of 5 seconds.
	quit := make(chan os.Signal)
	// kill (no param) default send syscall.SIGTERM
	// kill -2 is syscall.SIGINT
	// kill -9 is syscall.SIGKILL but can't be catch, so don't need add it
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	log.Println("Shutdown Server ...")

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		log.Fatal("Server Shutdown:", err)
	}
	// catching ctx.Done(). timeout of 5 seconds.
	select {
	case <-ctx.Done():
		log.Println("timeout of 5 seconds.")
	}
	log.Println("Server exiting")
}

Build a single binary with templates

You can build a server into a single binary containing templates by using go-assets.

func main() {
	r := gin.New()

	t, err := loadTemplate()
	if err != nil {
		panic(err)
	}
	r.SetHTMLTemplate(t)

	r.GET("/", func(c *gin.Context) {
		c.HTML(http.StatusOK, "/html/index.tmpl",nil)
	})
	r.Run(":8080")
}

// loadTemplate loads templates embedded by go-assets-builder
func loadTemplate() (*template.Template, error) {
	t := template.New("")
	for name, file := range Assets.Files {
		defer file.Close()
		if file.IsDir() || !strings.HasSuffix(name, ".tmpl") {
			continue
		}
		h, err := ioutil.ReadAll(file)
		if err != nil {
			return nil, err
		}
		t, err = t.New(name).Parse(string(h))
		if err != nil {
			return nil, err
		}
	}
	return t, nil
}

See a complete example in the https://github.com/gin-gonic/examples/tree/master/assets-in-binary directory.

Bind form-data request with custom struct

The follow example using custom struct:

type StructA struct {
    FieldA string `form:"field_a"`
}

type StructB struct {
    NestedStruct StructA
    FieldB string `form:"field_b"`
}

type StructC struct {
    NestedStructPointer *StructA
    FieldC string `form:"field_c"`
}

type StructD struct {
    NestedAnonyStruct struct {
        FieldX string `form:"field_x"`
    }
    FieldD string `form:"field_d"`
}

func GetDataB(c *gin.Context) {
    var b StructB
    c.Bind(&b)
    c.JSON(200, gin.H{
        "a": b.NestedStruct,
        "b": b.FieldB,
    })
}

func GetDataC(c *gin.Context) {
    var b StructC
    c.Bind(&b)
    c.JSON(200, gin.H{
        "a": b.NestedStructPointer,
        "c": b.FieldC,
    })
}

func GetDataD(c *gin.Context) {
    var b StructD
    c.Bind(&b)
    c.JSON(200, gin.H{
        "x": b.NestedAnonyStruct,
        "d": b.FieldD,
    })
}

func main() {
    r := gin.Default()
    r.GET("/getb", GetDataB)
    r.GET("/getc", GetDataC)
    r.GET("/getd", GetDataD)

    r.Run()
}

Using the command curl command result:

$ curl "http://localhost:8080/getb?field_a=hello&field_b=world"
{"a":{"FieldA":"hello"},"b":"world"}
$ curl "http://localhost:8080/getc?field_a=hello&field_c=world"
{"a":{"FieldA":"hello"},"c":"world"}
$ curl "http://localhost:8080/getd?field_x=hello&field_d=world"
{"d":"world","x":{"FieldX":"hello"}}

Try to bind body into different structs

The normal methods for binding request body consumes c.Request.Body and they cannot be called multiple times.

type formA struct {
  Foo string `json:"foo" xml:"foo" binding:"required"`
}

type formB struct {
  Bar string `json:"bar" xml:"bar" binding:"required"`
}

func SomeHandler(c *gin.Context) {
  objA := formA{}
  objB := formB{}
  // This c.ShouldBind consumes c.Request.Body and it cannot be reused.
  if errA := c.ShouldBind(&objA); errA == nil {
    c.String(http.StatusOK, `the body should be formA`)
  // Always an error is occurred by this because c.Request.Body is EOF now.
  } else if errB := c.ShouldBind(&objB); errB == nil {
    c.String(http.StatusOK, `the body should be formB`)
  } else {
    ...
  }
}

For this, you can use c.ShouldBindBodyWith.

func SomeHandler(c *gin.Context) {
  objA := formA{}
  objB := formB{}
  // This reads c.Request.Body and stores the result into the context.
  if errA := c.ShouldBindBodyWith(&objA, binding.JSON); errA == nil {
    c.String(http.StatusOK, `the body should be formA`)
  // At this time, it reuses body stored in the context.
  } else if errB := c.ShouldBindBodyWith(&objB, binding.JSON); errB == nil {
    c.String(http.StatusOK, `the body should be formB JSON`)
  // And it can accepts other formats
  } else if errB2 := c.ShouldBindBodyWith(&objB, binding.XML); errB2 == nil {
    c.String(http.StatusOK, `the body should be formB XML`)
  } else {
    ...
  }
}

• c.ShouldBindBodyWith stores body into the context before binding. This has a slight impact to performance, so you should not use this method if you are enough to call binding at once.
• This feature is only needed for some formats -- JSON, XML, MsgPack, ProtoBuf. For other formats, Query, Form, FormPost, FormMultipart, can be called by c.ShouldBind() multiple times without any damage to performance (See #1341).

http2 server push

http.Pusher is supported only go1.8+. See the golang blog for detail information.

package main

import (
	"html/template"
	"log"

	"github.com/gin-gonic/gin"
)

var html = template.Must(template.New("https").Parse(`
<html>
<head>
  <title>Https Test</title>
  <script src="/assets/app.js"></script>
</head>
<body>
  <h1 style="color:red;">Welcome, Ginner!</h1>
</body>
</html>
`))

func main() {
	r := gin.Default()
	r.Static("/assets", "./assets")
	r.SetHTMLTemplate(html)

	r.GET("/", func(c *gin.Context) {
		if pusher := c.Writer.Pusher(); pusher != nil {
			// use pusher.Push() to do server push
			if err := pusher.Push("/assets/app.js", nil); err != nil {
				log.Printf("Failed to push: %v", err)
			}
		}
		c.HTML(200, "https", gin.H{
			"status": "success",
		})
	})

	// Listen and Server in https://127.0.0.1:8080
	r.RunTLS(":8080", "./testdata/server.pem", "./testdata/server.key")
}

Define format for the log of routes

The default log of routes is:

[GIN-debug] POST   /foo                      --> main.main.func1 (3 handlers)
[GIN-debug] GET    /bar                      --> main.main.func2 (3 handlers)
[GIN-debug] GET    /status                   --> main.main.func3 (3 handlers)

If you want to log this information in given format (e.g. JSON, key values or something else), then you can define this format with gin.DebugPrintRouteFunc. In the example below, we log all routes with standard log package but you can use another log tools that suits of your needs.

import (
	"log"
	"net/http"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()
	gin.DebugPrintRouteFunc = func(httpMethod, absolutePath, handlerName string, nuHandlers int) {
		log.Printf("endpoint %v %v %v %v\n", httpMethod, absolutePath, handlerName, nuHandlers)
	}

	r.POST("/foo", func(c *gin.Context) {
		c.JSON(http.StatusOK, "foo")
	})

	r.GET("/bar", func(c *gin.Context) {
		c.JSON(http.StatusOK, "bar")
	})

	r.GET("/status", func(c *gin.Context) {
		c.JSON(http.StatusOK, "ok")
	})

	// Listen and Server in http://0.0.0.0:8080
	r.Run()
}

Set and get a cookie

import (
    "fmt"

    "github.com/gin-gonic/gin"
)

func main() {

    router := gin.Default()

    router.GET("/cookie", func(c *gin.Context) {

        cookie, err := c.Cookie("gin_cookie")

        if err != nil {
            cookie = "NotSet"
            c.SetCookie("gin_cookie", "test", 3600, "/", "localhost", false, true)
        }

        fmt.Printf("Cookie value: %s \n", cookie)
    })

    router.Run()
}

Testing

The net/http/httptest package is preferable way for HTTP testing.

package main

func setupRouter() *gin.Engine {
	r := gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.String(200, "pong")
	})
	return r
}

func main() {
	r := setupRouter()
	r.Run(":8080")
}

Test for code example above:

package main

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestPingRoute(t *testing.T) {
	router := setupRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/ping", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, 200, w.Code)
	assert.Equal(t, "pong", w.Body.String())
}

Users

Awesome project lists using Gin web framework.

• gorush: A push notification server written in Go.
• fnproject: The container native, cloud agnostic serverless platform.
• photoprism: Personal photo management powered by Go and Google TensorFlow.
• krakend: Ultra performant API Gateway with middlewares.
• picfit: An image resizing server written in Go.
• brigade: Event-based Scripting for Kubernetes.
• dkron: Distributed, fault tolerant job scheduling system.

Documentation

Index

• Constants
• Variables
• func AssetsCSS(text string) template.HTML
• func AssetsJs(text string) template.HTML
• func Compare(a, b interface{}) (equal bool)
• func CompareNot(a, b interface{}) (equal bool)
• func CreateTestContext(w http.ResponseWriter) (c *Context, r *Engine)
• func Date(t time.Time, format string) string
• func DateFormat(t time.Time, layout string) (datestring string)
• func DateParse(dateString, format string) (time.Time, error)
• func Dir(root string, listDirectory bool) http.FileSystem
• func DisableBindValidation()
• func DisableConsoleColor()
• func EnableJsonDecoderDisallowUnknownFields()
• func EnableJsonDecoderUseNumber()
• func ForceConsoleColor()
• func HTML2str(html string) string
• func Htmlquote(text string) string
• func Htmlunquote(text string) string
• func IsDebugging() bool
• func MapGet(arg1 interface{}, arg2 ...interface{}) (interface{}, error)
• func Mode() string
• func NotNil(a interface{}) (isNil bool)
• func ParseForm(form url.Values, obj interface{}) error
• func RenderForm(obj interface{}) template.HTML
• func SetMode(value string)
• func Str2html(raw string) template.HTML
• func Substr(s string, start, length int) string
• func URLFor(endpoint string, values ...interface{}) string
• type Accounts
• type Context
  • func (c *Context) Abort()
  • func (c *Context) AbortWithError(code int, err error) *Error
  • func (c *Context) AbortWithStatus(code int)
  • func (c *Context) AbortWithStatusJSON(code int, jsonObj interface{})
  • func (c *Context) AddParam(key, value string)
  • func (c *Context) AsciiJSON(code int, obj interface{})
  • func (c *Context) Bind(obj interface{}) error
  • func (c *Context) BindHeader(obj interface{}) error
  • func (c *Context) BindJSON(obj interface{}) error
  • func (c *Context) BindQuery(obj interface{}) error
  • func (c *Context) BindUri(obj interface{}) error
  • func (c *Context) BindWith(obj interface{}, b binding.Binding) error
  • func (c *Context) BindXML(obj interface{}) error
  • func (c *Context) BindYAML(obj interface{}) error
  • func (c *Context) ClientIP() string
  • func (c *Context) ContentType() string
  • func (c *Context) Cookie(name string) (string, error)
  • func (c *Context) Copy() *Context
  • func (c *Context) Data(code int, contentType string, data []byte)
  • func (c *Context) DataFromReader(code int, contentLength int64, contentType string, reader io.Reader, ...)
  • func (c *Context) Deadline() (deadline time.Time, ok bool)
  • func (c *Context) DefaultPostForm(key, defaultValue string) string
  • func (c *Context) DefaultQuery(key, defaultValue string) string
  • func (c *Context) Done() <-chan struct{}
  • func (c *Context) Err() error
  • func (c *Context) Error(err error) *Error
  • func (c *Context) File(filepath string)
  • func (c *Context) FileAttachment(filepath, filename string)
  • func (c *Context) FileFromFS(filepath string, fs http.FileSystem)
  • func (c *Context) FormFile(name string) (*multipart.FileHeader, error)
  • func (c *Context) FullPath() string
  • func (c *Context) Get(key string) (value interface{}, exists bool)
  • func (c *Context) GetBool(key string) (b bool)
  • func (c *Context) GetDuration(key string) (d time.Duration)
  • func (c *Context) GetFloat64(key string) (f64 float64)
  • func (c *Context) GetHeader(key string) string
  • func (c *Context) GetInt(key string) (i int)
  • func (c *Context) GetInt64(key string) (i64 int64)
  • func (c *Context) GetPostForm(key string) (string, bool)
  • func (c *Context) GetPostFormArray(key string) (values []string, ok bool)
  • func (c *Context) GetPostFormMap(key string) (map[string]string, bool)
  • func (c *Context) GetQuery(key string) (string, bool)
  • func (c *Context) GetQueryArray(key string) (values []string, ok bool)
  • func (c *Context) GetQueryMap(key string) (map[string]string, bool)
  • func (c *Context) GetRawData() ([]byte, error)
  • func (c *Context) GetRoute() string
  • func (c *Context) GetString(key string) (s string)
  • func (c *Context) GetStringMap(key string) (sm map[string]interface{})
  • func (c *Context) GetStringMapString(key string) (sms map[string]string)
  • func (c *Context) GetStringMapStringSlice(key string) (smss map[string][]string)
  • func (c *Context) GetStringSlice(key string) (ss []string)
  • func (c *Context) GetTime(key string) (t time.Time)
  • func (c *Context) GetUint(key string) (ui uint)
  • func (c *Context) GetUint64(key string) (ui64 uint64)
  • func (c *Context) HTML(code int, name string, obj interface{})
  • func (c *Context) Handler() HandlerFunc
  • func (c *Context) HandlerName() string
  • func (c *Context) HandlerNames() []string
  • func (c *Context) Header(key, value string)
  • func (c *Context) IndentedJSON(code int, obj interface{})
  • func (c *Context) IsAborted() bool
  • func (c *Context) IsWebsocket() bool
  • func (c *Context) JSON(code int, obj interface{})
  • func (c *Context) JSONP(code int, obj interface{})
  • func (c *Context) MultipartForm() (*multipart.Form, error)
  • func (c *Context) MustBindWith(obj interface{}, b binding.Binding) error
  • func (c *Context) MustGet(key string) interface{}
  • func (c *Context) Negotiate(code int, config Negotiate)
  • func (c *Context) NegotiateFormat(offered ...string) string
  • func (c *Context) Next()
  • func (c *Context) Param(key string) string
  • func (c *Context) PostForm(key string) (value string)
  • func (c *Context) PostFormArray(key string) (values []string)
  • func (c *Context) PostFormMap(key string) (dicts map[string]string)
  • func (c *Context) ProtoBuf(code int, obj interface{})
  • func (c *Context) PureJSON(code int, obj interface{})
  • func (c *Context) Query(key string) (value string)
  • func (c *Context) QueryArray(key string) (values []string)
  • func (c *Context) QueryMap(key string) (dicts map[string]string)
  • func (c *Context) Redirect(code int, location string)
  • func (c *Context) RemoteIP() string
  • func (c *Context) Render(code int, r render.Render)
  • func (c *Context) Routes() map[string]string
  • func (c *Context) SSEvent(name string, message interface{})
  • func (c *Context) SaveUploadedFile(file *multipart.FileHeader, dst string) error
  • func (c *Context) SecureJSON(code int, obj interface{})
  • func (c *Context) Set(key string, value interface{})
  • func (c *Context) SetAccepted(formats ...string)
  • func (c *Context) SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool)
  • func (c *Context) SetSameSite(samesite http.SameSite)
  • func (c *Context) ShouldBind(obj interface{}) error
  • func (c *Context) ShouldBindBodyWith(obj interface{}, bb binding.BindingBody) (err error)
  • func (c *Context) ShouldBindHeader(obj interface{}) error
  • func (c *Context) ShouldBindJSON(obj interface{}) error
  • func (c *Context) ShouldBindQuery(obj interface{}) error
  • func (c *Context) ShouldBindUri(obj interface{}) error
  • func (c *Context) ShouldBindWith(obj interface{}, b binding.Binding) error
  • func (c *Context) ShouldBindXML(obj interface{}) error
  • func (c *Context) ShouldBindYAML(obj interface{}) error
  • func (c *Context) Status(code int)
  • func (c *Context) Stream(step func(w io.Writer) bool) bool
  • func (c *Context) String(code int, format string, values ...interface{})
  • func (c *Context) Value(key interface{}) interface{}
  • func (c *Context) XML(code int, obj interface{})
  • func (c *Context) YAML(code int, obj interface{})
• type Engine
  • func Default() *Engine
  • func New() *Engine
  • func (engine *Engine) AddFuncMap(key string, fn interface{}) error
  • func (engine *Engine) Delims(left, right string) *Engine
  • func (engine *Engine) GetRoutes() map[string]string
  • func (engine *Engine) HandleContext(c *Context)
  • func (engine *Engine) InitFuncMap()
  • func (engine *Engine) LoadHTMLFiles(files ...string)
  • func (engine *Engine) LoadHTMLGlob(pattern string)
  • func (engine *Engine) NoMethod(handlers ...HandlerFunc)
  • func (engine *Engine) NoRoute(handlers ...HandlerFunc)
  • func (engine *Engine) Routes() (routes RoutesInfo)
  • func (engine *Engine) Run(addr ...string) (err error)
  • func (engine *Engine) RunFd(fd int) (err error)
  • func (engine *Engine) RunListener(listener net.Listener) (err error)
  • func (engine *Engine) RunTLS(addr, certFile, keyFile string) (err error)
  • func (engine *Engine) RunUnix(file string) (err error)
  • func (engine *Engine) SecureJsonPrefix(prefix string) *Engine
  • func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request)
  • func (engine *Engine) SetFuncMap(funcMap template.FuncMap)
  • func (engine *Engine) SetHTMLTemplate(templ *template.Template)
  • func (engine *Engine) SetTrustedProxies(trustedProxies []string) error
  • func (engine *Engine) Use(middleware ...HandlerFunc) IRoutes
• type Error
  • func (msg Error) Error() string
  • func (msg *Error) IsType(flags ErrorType) bool
  • func (msg *Error) JSON() interface{}
  • func (msg *Error) MarshalJSON() ([]byte, error)
  • func (msg *Error) SetMeta(data interface{}) *Error
  • func (msg *Error) SetType(flags ErrorType) *Error
  • func (msg *Error) Unwrap() error
• type ErrorType
• type H
  • func (h H) MarshalXML(e *xml.Encoder, start xml.StartElement) error
• type HandlerFunc
  • func BasicAuth(accounts Accounts) HandlerFunc
  • func BasicAuthForRealm(accounts Accounts, realm string) HandlerFunc
  • func Bind(val interface{}) HandlerFunc
  • func CustomRecovery(handle RecoveryFunc) HandlerFunc
  • func CustomRecoveryWithWriter(out io.Writer, handle RecoveryFunc) HandlerFunc
  • func ErrorLogger() HandlerFunc
  • func ErrorLoggerT(typ ErrorType) HandlerFunc
  • func Logger() HandlerFunc
  • func LoggerWithConfig(conf LoggerConfig) HandlerFunc
  • func LoggerWithFormatter(f LogFormatter) HandlerFunc
  • func LoggerWithWriter(out io.Writer, notlogged ...string) HandlerFunc
  • func Recovery() HandlerFunc
  • func RecoveryWithWriter(out io.Writer, recovery ...RecoveryFunc) HandlerFunc
  • func WrapF(f http.HandlerFunc) HandlerFunc
  • func WrapH(h http.Handler) HandlerFunc
• type HandlersChain
  • func (c HandlersChain) Last() HandlerFunc
• type IRouter
• type IRoutes
• type LogFormatter
• type LogFormatterParams
  • func (p *LogFormatterParams) IsOutputColor() bool
  • func (p *LogFormatterParams) MethodColor() string
  • func (p *LogFormatterParams) ResetColor() string
  • func (p *LogFormatterParams) StatusCodeColor() string
• type LoggerConfig
• type Negotiate
• type Param
• type Params
  • func (ps Params) ByName(name string) (va string)
  • func (ps Params) Get(name string) (string, bool)
• type RecoveryFunc
• type ResponseWriter
• type RouteInfo
• type RouterGroup
  • func (group *RouterGroup) Any(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) BasePath() string
  • func (group *RouterGroup) DELETE(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) GET(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) Group(relativePath string, handlers ...HandlerFunc) *RouterGroup
  • func (group *RouterGroup) HEAD(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) Handle(httpMethod, relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) OPTIONS(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) PATCH(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) POST(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) PUT(relativePath, routeName string, handlers ...HandlerFunc) IRoutes
  • func (group *RouterGroup) Static(relativePath, root string) IRoutes
  • func (group *RouterGroup) StaticFS(relativePath string, fs http.FileSystem) IRoutes
  • func (group *RouterGroup) StaticFile(relativePath, filepath string) IRoutes
  • func (group *RouterGroup) Use(middleware ...HandlerFunc) IRoutes
• type RoutesInfo

Constants

const (
	MIMEJSON              = binding.MIMEJSON
	MIMEHTML              = binding.MIMEHTML
	MIMEXML               = binding.MIMEXML
	MIMEXML2              = binding.MIMEXML2
	MIMEPlain             = binding.MIMEPlain
	MIMEPOSTForm          = binding.MIMEPOSTForm
	MIMEMultipartPOSTForm = binding.MIMEMultipartPOSTForm
	MIMEYAML              = binding.MIMEYAML
)

Content-Type MIME of the most common data formats.

const (
	// When running on Google App Engine. Trust X-Appengine-Remote-Addr
	// for determining the client's IP
	PlatformGoogleAppEngine = "X-Appengine-Remote-Addr"
	// When using Cloudflare's CDN. Trust CF-Connecting-IP for determining
	// the client's IP
	PlatformCloudflare = "CF-Connecting-IP"
)

Trusted platforms

const (
	// DebugMode indicates gin mode is debug.
	DebugMode = "debug"
	// ReleaseMode indicates gin mode is release.
	ReleaseMode = "release"
	// TestMode indicates gin mode is test.
	TestMode = "test"
)

const AuthUserKey = "user"

AuthUserKey is the cookie name for user credential in basic auth.

const BindKey = "_gin-gonic/gin/bindkey"

BindKey indicates a default bind key.

const BodyBytesKey = "_gin-gonic/gin/bodybyteskey"

BodyBytesKey indicates a default body bytes key.

const EnvGinMode = "GIN_MODE"

EnvGinMode indicates environment name for gin mode.

const Version = "v1.7.7"

Version is the current gin framework's version.

Variables

var DebugPrintRouteFunc func(httpMethod, absolutePath, handlerName string, nuHandlers int)

DebugPrintRouteFunc indicates debug log output format.

var DefaultErrorWriter io.Writer = os.Stderr

DefaultErrorWriter is the default io.Writer used by Gin to debug errors

var DefaultWriter io.Writer = os.Stdout

DefaultWriter is the default io.Writer used by Gin for debug output and middleware output like Logger() or Recovery(). Note that both Logger and Recovery provides custom ways to configure their output io.Writer. To support coloring in Windows use:

import "github.com/mattn/go-colorable"
gin.DefaultWriter = colorable.NewColorableStdout()

Functions

func AssetsCSS

func AssetsCSS(text string) template.HTML

AssetsCSS returns stylesheet link tag with src string.

func AssetsJs

func AssetsJs(text string) template.HTML

AssetsJs returns script tag with src string.

func Compare

func Compare(a, b interface{}) (equal bool)

Compare is a quick and dirty comparison function. It will convert whatever you give it to strings and see if the two values are equal. Whitespace is trimmed. Used by the template parser as "eq".

func CompareNot

func CompareNot(a, b interface{}) (equal bool)

CompareNot !Compare

func CreateTestContext

func CreateTestContext(w http.ResponseWriter) (c *Context, r *Engine)

CreateTestContext returns a fresh engine and context for testing purposes

func Date

func Date(t time.Time, format string) string

Date takes a PHP like date func to Go's time format.

func DateFormat

func DateFormat(t time.Time, layout string) (datestring string)

DateFormat takes a time and a layout string and returns a string with the formatted date. Used by the template parser as "dateformat"

func DateParse

func DateParse(dateString, format string) (time.Time, error)

DateParse Parse Date use PHP time format.

func Dir

func Dir(root string, listDirectory bool) http.FileSystem

Dir returns a http.FileSystem that can be used by http.FileServer(). It is used internally in router.Static(). if listDirectory == true, then it works the same as http.Dir() otherwise it returns a filesystem that prevents http.FileServer() to list the directory files.

func DisableBindValidation

func DisableBindValidation()

DisableBindValidation closes the default validator.

func DisableConsoleColor

func DisableConsoleColor()

DisableConsoleColor disables color output in the console.

func EnableJsonDecoderDisallowUnknownFields

func EnableJsonDecoderDisallowUnknownFields()

EnableJsonDecoderDisallowUnknownFields sets true for binding.EnableDecoderDisallowUnknownFields to call the DisallowUnknownFields method on the JSON Decoder instance.

func EnableJsonDecoderUseNumber

func EnableJsonDecoderUseNumber()

EnableJsonDecoderUseNumber sets true for binding.EnableDecoderUseNumber to call the UseNumber method on the JSON Decoder instance.

func ForceConsoleColor

func ForceConsoleColor()

ForceConsoleColor force color output in the console.

func HTML2str

func HTML2str(html string) string

HTML2str returns escaping text convert from html.

func Htmlquote

func Htmlquote(text string) string

Htmlquote returns quoted html string.

func Htmlunquote

func Htmlunquote(text string) string

Htmlunquote returns unquoted html string.

func IsDebugging

func IsDebugging() bool

IsDebugging returns true if the framework is running in debug mode. Use SetMode(gin.ReleaseMode) to disable debug mode.

func MapGet

func MapGet(arg1 interface{}, arg2 ...interface{}) (interface{}, error)

MapGet getting value from map by keys usage:

Data["m"] = M{
    "a": 1,
    "1": map[string]float64{
        "c": 4,
    },
}

{{ map_get m "a" }} // return 1 {{ map_get m 1 "c" }} // return 4

func Mode

func Mode() string

Mode returns current gin mode.

func NotNil

func NotNil(a interface{}) (isNil bool)

NotNil the same as CompareNot

func ParseForm

func ParseForm(form url.Values, obj interface{}) error

ParseForm will parse form values to struct via tag.

func RenderForm

func RenderForm(obj interface{}) template.HTML

RenderForm will render object to form html. obj must be a struct pointer.

func SetMode

func SetMode(value string)

SetMode sets gin mode according to input string.

func Str2html

func Str2html(raw string) template.HTML

Str2html Convert string to template.HTML type.

func Substr

func Substr(s string, start, length int) string

Substr returns the substr from start to length.

func URLFor

func URLFor(endpoint string, values ...interface{}) string

URLFor returns url string with another registered controller handler with params.

	usage:

	URLFor(".index")
	print URLFor("index")
 router /login
	print URLFor("login")
	print URLFor("login", "next","/"")
 router /profile/:username
	print UrlFor("profile", ":username","John Doe")

Types

type Accounts

type Accounts map[string]string

Accounts defines a key/value for user/pass list of authorized logins.

type Context

type Context struct {
	Request *http.Request
	Writer  ResponseWriter
	Params  Params

	// Keys is a key/value pair exclusively for the context of each request.
	Keys map[string]interface{}

	// Errors is a list of errors attached to all the handlers/middlewares who used this context.
	Errors errorMsgs

	// Accepted defines a list of manually accepted formats for content negotiation.
	Accepted []string
	// contains filtered or unexported fields
}

Context is the most important part of gin. It allows us to pass variables between middleware, manage the flow, validate the JSON of a request and render a JSON response for example.

func (*Context) Abort

func (c *Context) Abort()

Abort prevents pending handlers from being called. Note that this will not stop the current handler. Let's say you have an authorization middleware that validates that the current request is authorized. If the authorization fails (ex: the password does not match), call Abort to ensure the remaining handlers for this request are not called.

func (*Context) AbortWithError

func (c *Context) AbortWithError(code int, err error) *Error

AbortWithError calls `AbortWithStatus()` and `Error()` internally. This method stops the chain, writes the status code and pushes the specified error to `c.Errors`. See Context.Error() for more details.

func (*Context) AbortWithStatus

func (c *Context) AbortWithStatus(code int)

AbortWithStatus calls `Abort()` and writes the headers with the specified status code. For example, a failed attempt to authenticate a request could use: context.AbortWithStatus(401).

func (*Context) AbortWithStatusJSON

func (c *Context) AbortWithStatusJSON(code int, jsonObj interface{})

AbortWithStatusJSON calls `Abort()` and then `JSON` internally. This method stops the chain, writes the status code and return a JSON body. It also sets the Content-Type as "application/json".

func (*Context) AddParam

func (c *Context) AddParam(key, value string)

AddParam adds param to context and replaces path param key with given value for e2e testing purposes Example Route: "/user/:id" AddParam("id", 1) Result: "/user/1"

func (*Context) AsciiJSON

func (c *Context) AsciiJSON(code int, obj interface{})

AsciiJSON serializes the given struct as JSON into the response body with unicode to ASCII string. It also sets the Content-Type as "application/json".

func (*Context) Bind

func (c *Context) Bind(obj interface{}) error

Bind checks the Content-Type to select a binding engine automatically, Depending on the "Content-Type" header different bindings are used:

"application/json" --> JSON binding
"application/xml"  --> XML binding

otherwise --> returns an error. It parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input. It decodes the json payload into the struct specified as a pointer. It writes a 400 error and sets Content-Type header "text/plain" in the response if input is not valid.

func (*Context) BindHeader

func (c *Context) BindHeader(obj interface{}) error

BindHeader is a shortcut for c.MustBindWith(obj, binding.Header).

func (*Context) BindJSON

func (c *Context) BindJSON(obj interface{}) error

BindJSON is a shortcut for c.MustBindWith(obj, binding.JSON).

func (*Context) BindQuery

func (c *Context) BindQuery(obj interface{}) error

BindQuery is a shortcut for c.MustBindWith(obj, binding.Query).

func (*Context) BindUri

func (c *Context) BindUri(obj interface{}) error

BindUri binds the passed struct pointer using binding.Uri. It will abort the request with HTTP 400 if any error occurs.

func (*Context) BindWith

func (c *Context) BindWith(obj interface{}, b binding.Binding) error

BindWith binds the passed struct pointer using the specified binding engine. See the binding package.

func (*Context) BindXML

func (c *Context) BindXML(obj interface{}) error

BindXML is a shortcut for c.MustBindWith(obj, binding.BindXML).

func (*Context) BindYAML

func (c *Context) BindYAML(obj interface{}) error

BindYAML is a shortcut for c.MustBindWith(obj, binding.YAML).

func (*Context) ClientIP

func (c *Context) ClientIP() string

ClientIP implements one best effort algorithm to return the real client IP. It called c.RemoteIP() under the hood, to check if the remote IP is a trusted proxy or not. If it is it will then try to parse the headers defined in Engine.RemoteIPHeaders (defaulting to [X-Forwarded-For, X-Real-Ip]). If the headers are not syntactically valid OR the remote IP does not correspond to a trusted proxy, the remote IP (coming from Request.RemoteAddr) is returned.

func (*Context) ContentType

func (c *Context) ContentType() string

ContentType returns the Content-Type header of the request.

func (*Context) Cookie

func (c *Context) Cookie(name string) (string, error)

Cookie returns the named cookie provided in the request or ErrNoCookie if not found. And return the named cookie is unescaped. If multiple cookies match the given name, only one cookie will be returned.

func (*Context) Copy

func (c *Context) Copy() *Context

Copy returns a copy of the current context that can be safely used outside the request's scope. This has to be used when the context has to be passed to a goroutine.

func (*Context) Data

func (c *Context) Data(code int, contentType string, data []byte)

Data writes some data into the body stream and updates the HTTP code.

func (*Context) DataFromReader

func (c *Context) DataFromReader(code int, contentLength int64, contentType string, reader io.Reader, extraHeaders map[string]string)

DataFromReader writes the specified reader into the body stream and updates the HTTP code.

func (*Context) Deadline

func (c *Context) Deadline() (deadline time.Time, ok bool)

Deadline returns that there is no deadline (ok==false) when c.Request has no Context.

func (*Context) DefaultPostForm

func (c *Context) DefaultPostForm(key, defaultValue string) string

DefaultPostForm returns the specified key from a POST urlencoded form or multipart form when it exists, otherwise it returns the specified defaultValue string. See: PostForm() and GetPostForm() for further information.

func (*Context) DefaultQuery

func (c *Context) DefaultQuery(key, defaultValue string) string

DefaultQuery returns the keyed url query value if it exists, otherwise it returns the specified defaultValue string. See: Query() and GetQuery() for further information.

GET /?name=Manu&lastname=
c.DefaultQuery("name", "unknown") == "Manu"
c.DefaultQuery("id", "none") == "none"
c.DefaultQuery("lastname", "none") == ""

func (*Context) Done

func (c *Context) Done() <-chan struct{}

Done returns nil (chan which will wait forever) when c.Request has no Context.

func (*Context) Err

func (c *Context) Err() error

Err returns nil when c.Request has no Context.

func (*Context) Error

func (c *Context) Error(err error) *Error

Error attaches an error to the current context. The error is pushed to a list of errors. It's a good idea to call Error for each error that occurred during the resolution of a request. A middleware can be used to collect all the errors and push them to a database together, print a log, or append it in the HTTP response. Error will panic if err is nil.

func (*Context) File

func (c *Context) File(filepath string)

File writes the specified file into the body stream in an efficient way.

func (*Context) FileAttachment

func (c *Context) FileAttachment(filepath, filename string)

FileAttachment writes the specified file into the body stream in an efficient way On the client side, the file will typically be downloaded with the given filename

func (*Context) FileFromFS

func (c *Context) FileFromFS(filepath string, fs http.FileSystem)

FileFromFS writes the specified file from http.FileSystem into the body stream in an efficient way.

func (*Context) FormFile

func (c *Context) FormFile(name string) (*multipart.FileHeader, error)

FormFile returns the first file for the provided form key.

func (*Context) FullPath

func (c *Context) FullPath() string

FullPath returns a matched route full path. For not found routes returns an empty string.

router.GET("/user/:id", func(c *gin.Context) {
    c.FullPath() == "/user/:id" // true
})

func (*Context) Get

func (c *Context) Get(key string) (value interface{}, exists bool)

Get returns the value for the given key, ie: (value, true). If the value does not exist it returns (nil, false)

func (*Context) GetBool

func (c *Context) GetBool(key string) (b bool)

GetBool returns the value associated with the key as a boolean.

func (*Context) GetDuration

func (c *Context) GetDuration(key string) (d time.Duration)

GetDuration returns the value associated with the key as a duration.

func (*Context) GetFloat64

func (c *Context) GetFloat64(key string) (f64 float64)

GetFloat64 returns the value associated with the key as a float64.

func (*Context) GetHeader

func (c *Context) GetHeader(key string) string

GetHeader returns value from request headers.

func (*Context) GetInt

func (c *Context) GetInt(key string) (i int)

GetInt returns the value associated with the key as an integer.

func (*Context) GetInt64

func (c *Context) GetInt64(key string) (i64 int64)

GetInt64 returns the value associated with the key as an integer.

func (*Context) GetPostForm

func (c *Context) GetPostForm(key string) (string, bool)

GetPostForm is like PostForm(key). It returns the specified key from a POST urlencoded form or multipart form when it exists `(value, true)` (even when the value is an empty string), otherwise it returns ("", false). For example, during a PATCH request to update the user's email:

    email=mail@example.com  -->  ("mail@example.com", true) := GetPostForm("email") // set email to "mail@example.com"
	   email=                  -->  ("", true) := GetPostForm("email") // set email to ""
                            -->  ("", false) := GetPostForm("email") // do nothing with email

func (*Context) GetPostFormArray

func (c *Context) GetPostFormArray(key string) (values []string, ok bool)

GetPostFormArray returns a slice of strings for a given form key, plus a boolean value whether at least one value exists for the given key.

func (*Context) GetPostFormMap

func (c *Context) GetPostFormMap(key string) (map[string]string, bool)

GetPostFormMap returns a map for a given form key, plus a boolean value whether at least one value exists for the given key.

func (*Context) GetQuery

func (c *Context) GetQuery(key string) (string, bool)

GetQuery is like Query(), it returns the keyed url query value if it exists `(value, true)` (even when the value is an empty string), otherwise it returns `("", false)`. It is shortcut for `c.Request.URL.Query().Get(key)`

GET /?name=Manu&lastname=
("Manu", true) == c.GetQuery("name")
("", false) == c.GetQuery("id")
("", true) == c.GetQuery("lastname")

func (*Context) GetQueryArray

func (c *Context) GetQueryArray(key string) (values []string, ok bool)

GetQueryArray returns a slice of strings for a given query key, plus a boolean value whether at least one value exists for the given key.

func (*Context) GetQueryMap

func (c *Context) GetQueryMap(key string) (map[string]string, bool)

GetQueryMap returns a map for a given query key, plus a boolean value whether at least one value exists for the given key.

func (*Context) GetRawData

func (c *Context) GetRawData() ([]byte, error)

GetRawData returns stream data.

func (*Context) GetRoute

func (c *Context) GetRoute() string

GetRoute get routename

func (*Context) GetString

func (c *Context) GetString(key string) (s string)

GetString returns the value associated with the key as a string.

func (*Context) GetStringMap

func (c *Context) GetStringMap(key string) (sm map[string]interface{})

GetStringMap returns the value associated with the key as a map of interfaces.

func (*Context) GetStringMapString

func (c *Context) GetStringMapString(key string) (sms map[string]string)

GetStringMapString returns the value associated with the key as a map of strings.

func (*Context) GetStringMapStringSlice

func (c *Context) GetStringMapStringSlice(key string) (smss map[string][]string)

GetStringMapStringSlice returns the value associated with the key as a map to a slice of strings.

func (*Context) GetStringSlice

func (c *Context) GetStringSlice(key string) (ss []string)

GetStringSlice returns the value associated with the key as a slice of strings.

func (*Context) GetTime

func (c *Context) GetTime(key string) (t time.Time)

GetTime returns the value associated with the key as time.

func (*Context) GetUint

func (c *Context) GetUint(key string) (ui uint)

GetUint returns the value associated with the key as an unsigned integer.

func (*Context) GetUint64

func (c *Context) GetUint64(key string) (ui64 uint64)

GetUint64 returns the value associated with the key as an unsigned integer.

func (*Context) HTML

func (c *Context) HTML(code int, name string, obj interface{})

HTML renders the HTTP template specified by its file name. It also updates the HTTP code and sets the Content-Type as "text/html". See http://golang.org/doc/articles/wiki/

func (*Context) Handler

func (c *Context) Handler() HandlerFunc

Handler returns the main handler.

func (*Context) HandlerName

func (c *Context) HandlerName() string

HandlerName returns the main handler's name. For example if the handler is "handleGetUsers()", this function will return "main.handleGetUsers".

func (*Context) HandlerNames

func (c *Context) HandlerNames() []string

HandlerNames returns a list of all registered handlers for this context in descending order, following the semantics of HandlerName()

func (*Context) Header

func (c *Context) Header(key, value string)

Header is an intelligent shortcut for c.Writer.Header().Set(key, value). It writes a header in the response. If value == "", this method removes the header `c.Writer.Header().Del(key)`

func (*Context) IndentedJSON

func (c *Context) IndentedJSON(code int, obj interface{})

IndentedJSON serializes the given struct as pretty JSON (indented + endlines) into the response body. It also sets the Content-Type as "application/json". WARNING: we recommend using this only for development purposes since printing pretty JSON is more CPU and bandwidth consuming. Use Context.JSON() instead.

func (*Context) IsAborted

func (c *Context) IsAborted() bool

IsAborted returns true if the current context was aborted.

func (*Context) IsWebsocket

func (c *Context) IsWebsocket() bool

IsWebsocket returns true if the request headers indicate that a websocket handshake is being initiated by the client.

func (*Context) JSON

func (c *Context) JSON(code int, obj interface{})

JSON serializes the given struct as JSON into the response body. It also sets the Content-Type as "application/json".

func (*Context) JSONP

func (c *Context) JSONP(code int, obj interface{})

JSONP serializes the given struct as JSON into the response body. It adds padding to response body to request data from a server residing in a different domain than the client. It also sets the Content-Type as "application/javascript".

func (*Context) MultipartForm

func (c *Context) MultipartForm() (*multipart.Form, error)

MultipartForm is the parsed multipart form, including file uploads.

func (*Context) MustBindWith

func (c *Context) MustBindWith(obj interface{}, b binding.Binding) error

MustBindWith binds the passed struct pointer using the specified binding engine. It will abort the request with HTTP 400 if any error occurs. See the binding package.

func (*Context) MustGet

func (c *Context) MustGet(key string) interface{}

MustGet returns the value for the given key if it exists, otherwise it panics.

func (*Context) Negotiate

func (c *Context) Negotiate(code int, config Negotiate)

Negotiate calls different Render according to acceptable Accept format.

func (*Context) NegotiateFormat

func (c *Context) NegotiateFormat(offered ...string) string

NegotiateFormat returns an acceptable Accept format.

func (*Context) Next

func (c *Context) Next()

Next should be used only inside middleware. It executes the pending handlers in the chain inside the calling handler. See example in GitHub.

func (*Context) Param

func (c *Context) Param(key string) string

Param returns the value of the URL param. It is a shortcut for c.Params.ByName(key)

router.GET("/user/:id", func(c *gin.Context) {
    // a GET request to /user/john
    id := c.Param("id") // id == "john"
})

func (*Context) PostForm

func (c *Context) PostForm(key string) (value string)

PostForm returns the specified key from a POST urlencoded form or multipart form when it exists, otherwise it returns an empty string `("")`.

func (*Context) PostFormArray

func (c *Context) PostFormArray(key string) (values []string)

PostFormArray returns a slice of strings for a given form key. The length of the slice depends on the number of params with the given key.

func (*Context) PostFormMap

func (c *Context) PostFormMap(key string) (dicts map[string]string)

PostFormMap returns a map for a given form key.

func (*Context) ProtoBuf

func (c *Context) ProtoBuf(code int, obj interface{})

ProtoBuf serializes the given struct as ProtoBuf into the response body.

func (*Context) PureJSON

func (c *Context) PureJSON(code int, obj interface{})

PureJSON serializes the given struct as JSON into the response body. PureJSON, unlike JSON, does not replace special html characters with their unicode entities.

func (*Context) Query

func (c *Context) Query(key string) (value string)

Query returns the keyed url query value if it exists, otherwise it returns an empty string `("")`. It is shortcut for `c.Request.URL.Query().Get(key)`

    GET /path?id=1234&name=Manu&value=
	   c.Query("id") == "1234"
	   c.Query("name") == "Manu"
	   c.Query("value") == ""
	   c.Query("wtf") == ""

func (*Context) QueryArray

func (c *Context) QueryArray(key string) (values []string)

QueryArray returns a slice of strings for a given query key. The length of the slice depends on the number of params with the given key.

func (*Context) QueryMap

func (c *Context) QueryMap(key string) (dicts map[string]string)

QueryMap returns a map for a given query key.

func (*Context) Redirect

func (c *Context) Redirect(code int, location string)

Redirect returns an HTTP redirect to the specific location.

func (*Context) RemoteIP

func (c *Context) RemoteIP() string

RemoteIP parses the IP from Request.RemoteAddr, normalizes and returns the IP (without the port).

func (*Context) Render

func (c *Context) Render(code int, r render.Render)

Render writes the response headers and calls render.Render to render data.

func (*Context) Routes

func (c *Context) Routes() map[string]string

Routes 获取所有方法

func (*Context) SSEvent

func (c *Context) SSEvent(name string, message interface{})

SSEvent writes a Server-Sent Event into the body stream.

func (*Context) SaveUploadedFile

func (c *Context) SaveUploadedFile(file *multipart.FileHeader, dst string) error

SaveUploadedFile uploads the form file to specific dst.

func (*Context) SecureJSON

func (c *Context) SecureJSON(code int, obj interface{})

SecureJSON serializes the given struct as Secure JSON into the response body. Default prepends "while(1)," to response body if the given struct is array values. It also sets the Content-Type as "application/json".

func (*Context) Set

func (c *Context) Set(key string, value interface{})

Set is used to store a new key/value pair exclusively for this context. It also lazy initializes c.Keys if it was not used previously.

func (*Context) SetAccepted

func (c *Context) SetAccepted(formats ...string)

SetAccepted sets Accept header data.

func (*Context) SetCookie

func (c *Context) SetCookie(name, value string, maxAge int, path, domain string, secure, httpOnly bool)

SetCookie adds a Set-Cookie header to the ResponseWriter's headers. The provided cookie must have a valid Name. Invalid cookies may be silently dropped.

func (*Context) SetSameSite

func (c *Context) SetSameSite(samesite http.SameSite)

SetSameSite with cookie

func (*Context) ShouldBind

func (c *Context) ShouldBind(obj interface{}) error

ShouldBind checks the Content-Type to select a binding engine automatically, Depending on the "Content-Type" header different bindings are used:

"application/json" --> JSON binding
"application/xml"  --> XML binding

otherwise --> returns an error It parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input. It decodes the json payload into the struct specified as a pointer. Like c.Bind() but this method does not set the response status code to 400 and abort if the json is not valid.

func (*Context) ShouldBindBodyWith

func (c *Context) ShouldBindBodyWith(obj interface{}, bb binding.BindingBody) (err error)

ShouldBindBodyWith is similar with ShouldBindWith, but it stores the request body into the context, and reuse when it is called again.

NOTE: This method reads the body before binding. So you should use ShouldBindWith for better performance if you need to call only once.

func (*Context) ShouldBindHeader

func (c *Context) ShouldBindHeader(obj interface{}) error

ShouldBindHeader is a shortcut for c.ShouldBindWith(obj, binding.Header).

func (*Context) ShouldBindJSON

func (c *Context) ShouldBindJSON(obj interface{}) error

ShouldBindJSON is a shortcut for c.ShouldBindWith(obj, binding.JSON).

func (*Context) ShouldBindQuery

func (c *Context) ShouldBindQuery(obj interface{}) error

ShouldBindQuery is a shortcut for c.ShouldBindWith(obj, binding.Query).

func (*Context) ShouldBindUri

func (c *Context) ShouldBindUri(obj interface{}) error

ShouldBindUri binds the passed struct pointer using the specified binding engine.

func (*Context) ShouldBindWith

func (c *Context) ShouldBindWith(obj interface{}, b binding.Binding) error

ShouldBindWith binds the passed struct pointer using the specified binding engine. See the binding package.

func (*Context) ShouldBindXML

func (c *Context) ShouldBindXML(obj interface{}) error

ShouldBindXML is a shortcut for c.ShouldBindWith(obj, binding.XML).

func (*Context) ShouldBindYAML

func (c *Context) ShouldBindYAML(obj interface{}) error

ShouldBindYAML is a shortcut for c.ShouldBindWith(obj, binding.YAML).

func (*Context) Status

func (c *Context) Status(code int)

Status sets the HTTP response code.

func (*Context) Stream

func (c *Context) Stream(step func(w io.Writer) bool) bool

Stream sends a streaming response and returns a boolean indicates "Is client disconnected in middle of stream"

func (*Context) String

func (c *Context) String(code int, format string, values ...interface{})

String writes the given string into the response body.

func (*Context) Value

func (c *Context) Value(key interface{}) interface{}

Value returns the value associated with this context for key, or nil if no value is associated with key. Successive calls to Value with the same key returns the same result.

func (*Context) XML

func (c *Context) XML(code int, obj interface{})

XML serializes the given struct as XML into the response body. It also sets the Content-Type as "application/xml".

func (*Context) YAML

func (c *Context) YAML(code int, obj interface{})

YAML serializes the given struct as YAML into the response body.

type Engine

type Engine struct {
	RouterGroup

	// Enables automatic redirection if the current route can't be matched but a
	// handler for the path with (without) the trailing slash exists.
	// For example if /foo/ is requested but a route only exists for /foo, the
	// client is redirected to /foo with http status code 301 for GET requests
	// and 307 for all other request methods.
	RedirectTrailingSlash bool

	// If enabled, the router tries to fix the current request path, if no
	// handle is registered for it.
	// First superfluous path elements like ../ or // are removed.
	// Afterwards the router does a case-insensitive lookup of the cleaned path.
	// If a handle can be found for this route, the router makes a redirection
	// to the corrected path with status code 301 for GET requests and 307 for
	// all other request methods.
	// For example /FOO and /..//Foo could be redirected to /foo.
	// RedirectTrailingSlash is independent of this option.
	RedirectFixedPath bool

	// If enabled, the router checks if another method is allowed for the
	// current route, if the current request can not be routed.
	// If this is the case, the request is answered with 'Method Not Allowed'
	// and HTTP status code 405.
	// If no other Method is allowed, the request is delegated to the NotFound
	// handler.
	HandleMethodNotAllowed bool

	// If enabled, client IP will be parsed from the request's headers that
	// match those stored at `(*gin.Engine).RemoteIPHeaders`. If no IP was
	// fetched, it falls back to the IP obtained from
	// `(*gin.Context).Request.RemoteAddr`.
	ForwardedByClientIP bool

	// DEPRECATED: USE `TrustedPlatform` WITH VALUE `gin.PlatformGoogleAppEngine` INSTEAD
	// #726 #755 If enabled, it will trust some headers starting with
	// 'X-AppEngine...' for better integration with that PaaS.
	AppEngine bool

	// If enabled, the url.RawPath will be used to find parameters.
	UseRawPath bool

	// If true, the path value will be unescaped.
	// If UseRawPath is false (by default), the UnescapePathValues effectively is true,
	// as url.Path gonna be used, which is already unescaped.
	UnescapePathValues bool

	// RemoveExtraSlash a parameter can be parsed from the URL even with extra slashes.
	// See the PR #1817 and issue #1644
	RemoveExtraSlash bool

	// List of headers used to obtain the client IP when
	// `(*gin.Engine).ForwardedByClientIP` is `true` and
	// `(*gin.Context).Request.RemoteAddr` is matched by at least one of the
	// network origins of list defined by `(*gin.Engine).SetTrustedProxies()`.
	RemoteIPHeaders []string

	// If set to a constant of value gin.Platform*, trusts the headers set by
	// that platform, for example to determine the client IP
	TrustedPlatform string

	// Value of 'maxMemory' param that is given to http.Request's ParseMultipartForm
	// method call.
	MaxMultipartMemory int64

	HTMLRender render.HTMLRender
	FuncMap    template.FuncMap

	Table *tablewriter.Table
	// contains filtered or unexported fields
}

Engine is the framework's instance, it contains the muxer, middleware and configuration settings. Create an instance of Engine, by using New() or Default()

var (
	App *Engine
)

func Default

func Default() *Engine

Default returns an Engine instance with the Logger and Recovery middleware already attached.

func New

func New() *Engine

New returns a new blank Engine instance without any middleware attached. By default the configuration is: - RedirectTrailingSlash: true - RedirectFixedPath: false - HandleMethodNotAllowed: false - ForwardedByClientIP: true - UseRawPath: false - UnescapePathValues: true

func (*Engine) AddFuncMap

func (engine *Engine) AddFuncMap(key string, fn interface{}) error

AddFuncMap let user to register a func in the template.

func (*Engine) Delims

func (engine *Engine) Delims(left, right string) *Engine

Delims sets template left and right delims and returns an Engine instance.

func (*Engine) GetRoutes

func (engine *Engine) GetRoutes() map[string]string

GetRoutes get routes

func (*Engine) HandleContext

func (engine *Engine) HandleContext(c *Context)

HandleContext re-enter a context that has been rewritten. This can be done by setting c.Request.URL.Path to your new target. Disclaimer: You can loop yourself to death with this, use wisely.

func (*Engine) InitFuncMap

func (engine *Engine) InitFuncMap()

InitFuncMap 系统初始化模板自定义函数

func (*Engine) LoadHTMLFiles

func (engine *Engine) LoadHTMLFiles(files ...string)

LoadHTMLFiles loads a slice of HTML files and associates the result with HTML renderer.

func (*Engine) LoadHTMLGlob

func (engine *Engine) LoadHTMLGlob(pattern string)

LoadHTMLGlob loads HTML files identified by glob pattern and associates the result with HTML renderer.

func (*Engine) NoMethod

func (engine *Engine) NoMethod(handlers ...HandlerFunc)

NoMethod sets the handlers called when Engine.HandleMethodNotAllowed = true.

func (*Engine) NoRoute

func (engine *Engine) NoRoute(handlers ...HandlerFunc)

NoRoute adds handlers for NoRoute. It returns a 404 code by default.

func (*Engine) Routes

func (engine *Engine) Routes() (routes RoutesInfo)

Routes returns a slice of registered routes, including some useful information, such as: the http method, path and the handler name.

func (*Engine) Run

func (engine *Engine) Run(addr ...string) (err error)

Run attaches the router to a http.Server and starts listening and serving HTTP requests. It is a shortcut for http.ListenAndServe(addr, router) Note: this method will block the calling goroutine indefinitely unless an error happens.

func (*Engine) RunFd

func (engine *Engine) RunFd(fd int) (err error)

RunFd attaches the router to a http.Server and starts listening and serving HTTP requests through the specified file descriptor. Note: this method will block the calling goroutine indefinitely unless an error happens.

func (*Engine) RunListener

func (engine *Engine) RunListener(listener net.Listener) (err error)

RunListener attaches the router to a http.Server and starts listening and serving HTTP requests through the specified net.Listener

func (*Engine) RunTLS

func (engine *Engine) RunTLS(addr, certFile, keyFile string) (err error)

RunTLS attaches the router to a http.Server and starts listening and serving HTTPS (secure) requests. It is a shortcut for http.ListenAndServeTLS(addr, certFile, keyFile, router) Note: this method will block the calling goroutine indefinitely unless an error happens.

func (*Engine) RunUnix

func (engine *Engine) RunUnix(file string) (err error)

RunUnix attaches the router to a http.Server and starts listening and serving HTTP requests through the specified unix socket (i.e. a file). Note: this method will block the calling goroutine indefinitely unless an error happens.

func (*Engine) SecureJsonPrefix

func (engine *Engine) SecureJsonPrefix(prefix string) *Engine

SecureJsonPrefix sets the secureJSONPrefix used in Context.SecureJSON.

func (*Engine) ServeHTTP

func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request)

ServeHTTP conforms to the http.Handler interface.

func (*Engine) SetFuncMap

func (engine *Engine) SetFuncMap(funcMap template.FuncMap)

SetFuncMap sets the FuncMap used for template.FuncMap.

func (*Engine) SetHTMLTemplate

func (engine *Engine) SetHTMLTemplate(templ *template.Template)

SetHTMLTemplate associate a template with HTML renderer.

func (*Engine) SetTrustedProxies

func (engine *Engine) SetTrustedProxies(trustedProxies []string) error

SetTrustedProxies set a list of network origins (IPv4 addresses, IPv4 CIDRs, IPv6 addresses or IPv6 CIDRs) from which to trust request's headers that contain alternative client IP when `(*gin.Engine).ForwardedByClientIP` is `true`. `TrustedProxies` feature is enabled by default, and it also trusts all proxies by default. If you want to disable this feature, use Engine.SetTrustedProxies(nil), then Context.ClientIP() will return the remote address directly.

func (*Engine) Use

func (engine *Engine) Use(middleware ...HandlerFunc) IRoutes

Use attaches a global middleware to the router. i.e. the middleware attached through Use() will be included in the handlers chain for every single request. Even 404, 405, static files... For example, this is the right place for a logger or error management middleware.

type Error

type Error struct {
	Err  error
	Type ErrorType
	Meta interface{}
}

Error represents a error's specification.

func (Error) Error

func (msg Error) Error() string

Error implements the error interface.

func (*Error) IsType

func (msg *Error) IsType(flags ErrorType) bool

IsType judges one error.

func (*Error) JSON

func (msg *Error) JSON() interface{}

JSON creates a properly formatted JSON

func (*Error) MarshalJSON

func (msg *Error) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaller interface.

func (*Error) SetMeta

func (msg *Error) SetMeta(data interface{}) *Error

SetMeta sets the error's meta data.

func (*Error) SetType

func (msg *Error) SetType(flags ErrorType) *Error

SetType sets the error's type.

func (*Error) Unwrap

func (msg *Error) Unwrap() error

Unwrap returns the wrapped error, to allow interoperability with errors.Is(), errors.As() and errors.Unwrap()

type ErrorType

type ErrorType uint64

ErrorType is an unsigned 64-bit error code as defined in the gin spec.

const (
	// ErrorTypeBind is used when Context.Bind() fails.
	ErrorTypeBind ErrorType = 1 << 63
	// ErrorTypeRender is used when Context.Render() fails.
	ErrorTypeRender ErrorType = 1 << 62
	// ErrorTypePrivate indicates a private error.
	ErrorTypePrivate ErrorType = 1 << 0
	// ErrorTypePublic indicates a public error.
	ErrorTypePublic ErrorType = 1 << 1
	// ErrorTypeAny indicates any other error.
	ErrorTypeAny ErrorType = 1<<64 - 1
	// ErrorTypeNu indicates any other error.
	ErrorTypeNu = 2
)

type H

type H map[string]interface{}

H is a shortcut for map[string]interface{}

func (H) MarshalXML

func (h H) MarshalXML(e *xml.Encoder, start xml.StartElement) error

MarshalXML allows type H to be used with xml.Marshal.

type HandlerFunc

type HandlerFunc func(*Context)

HandlerFunc defines the handler used by gin middleware as return value.

func BasicAuth

func BasicAuth(accounts Accounts) HandlerFunc

BasicAuth returns a Basic HTTP Authorization middleware. It takes as argument a map[string]string where the key is the user name and the value is the password.

func BasicAuthForRealm

func BasicAuthForRealm(accounts Accounts, realm string) HandlerFunc

BasicAuthForRealm returns a Basic HTTP Authorization middleware. It takes as arguments a map[string]string where the key is the user name and the value is the password, as well as the name of the Realm. If the realm is empty, "Authorization Required" will be used by default. (see http://tools.ietf.org/html/rfc2617#section-1.2)

func Bind

func Bind(val interface{}) HandlerFunc

Bind is a helper function for given interface object and returns a Gin middleware.

func CustomRecovery

func CustomRecovery(handle RecoveryFunc) HandlerFunc

CustomRecovery returns a middleware that recovers from any panics and calls the provided handle func to handle it.

func CustomRecoveryWithWriter

func CustomRecoveryWithWriter(out io.Writer, handle RecoveryFunc) HandlerFunc

CustomRecoveryWithWriter returns a middleware for a given writer that recovers from any panics and calls the provided handle func to handle it.

func ErrorLogger

func ErrorLogger() HandlerFunc

ErrorLogger returns a handlerfunc for any error type.

func ErrorLoggerT

func ErrorLoggerT(typ ErrorType) HandlerFunc

ErrorLoggerT returns a handlerfunc for a given error type.

func Logger

func Logger() HandlerFunc

Logger instances a Logger middleware that will write the logs to gin.DefaultWriter. By default, gin.DefaultWriter = os.Stdout.

func LoggerWithConfig

func LoggerWithConfig(conf LoggerConfig) HandlerFunc

LoggerWithConfig instance a Logger middleware with config.

func LoggerWithFormatter

func LoggerWithFormatter(f LogFormatter) HandlerFunc

LoggerWithFormatter instance a Logger middleware with the specified log format function.

func LoggerWithWriter

func LoggerWithWriter(out io.Writer, notlogged ...string) HandlerFunc

LoggerWithWriter instance a Logger middleware with the specified writer buffer. Example: os.Stdout, a file opened in write mode, a socket...

func Recovery

func Recovery() HandlerFunc

Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.

func RecoveryWithWriter

func RecoveryWithWriter(out io.Writer, recovery ...RecoveryFunc) HandlerFunc

RecoveryWithWriter returns a middleware for a given writer that recovers from any panics and writes a 500 if there was one.

func WrapF

func WrapF(f http.HandlerFunc) HandlerFunc

WrapF is a helper function for wrapping http.HandlerFunc and returns a Gin middleware.

func WrapH

func WrapH(h http.Handler) HandlerFunc

WrapH is a helper function for wrapping http.Handler and returns a Gin middleware.

type HandlersChain

type HandlersChain []HandlerFunc

HandlersChain defines a HandlerFunc slice.

func (HandlersChain) Last

func (c HandlersChain) Last() HandlerFunc

Last returns the last handler in the chain. i.e. the last handler is the main one.

type IRouter

type IRouter interface {
	IRoutes
	Group(string, ...HandlerFunc) *RouterGroup
}

IRouter defines all router handle interface includes single and group router.

type IRoutes

type IRoutes interface {
	Use(...HandlerFunc) IRoutes

	Handle(string, string, string, ...HandlerFunc) IRoutes
	Any(string, string, ...HandlerFunc) IRoutes
	GET(string, string, ...HandlerFunc) IRoutes
	POST(string, string, ...HandlerFunc) IRoutes
	DELETE(string, string, ...HandlerFunc) IRoutes
	PATCH(string, string, ...HandlerFunc) IRoutes
	PUT(string, string, ...HandlerFunc) IRoutes
	OPTIONS(string, string, ...HandlerFunc) IRoutes
	HEAD(string, string, ...HandlerFunc) IRoutes

	StaticFile(string, string) IRoutes
	Static(string, string) IRoutes
	StaticFS(string, http.FileSystem) IRoutes
}

IRoutes defines all router handle interface.

type LogFormatter

type LogFormatter func(params LogFormatterParams) string

LogFormatter gives the signature of the formatter function passed to LoggerWithFormatter

type LogFormatterParams

type LogFormatterParams struct {
	Request *http.Request

	// TimeStamp shows the time after the server returns a response.
	TimeStamp time.Time
	// StatusCode is HTTP response code.
	StatusCode int
	// Latency is how much time the server cost to process a certain request.
	Latency time.Duration
	// ClientIP equals Context's ClientIP method.
	ClientIP string
	// Method is the HTTP method given to the request.
	Method string
	// Path is a path the client requests.
	Path string
	// ErrorMessage is set if error has occurred in processing the request.
	ErrorMessage string

	// BodySize is the size of the Response Body
	BodySize int
	// Keys are the keys set on the request's context.
	Keys map[string]interface{}
	// contains filtered or unexported fields
}

LogFormatterParams is the structure any formatter will be handed when time to log comes

func (*LogFormatterParams) IsOutputColor

func (p *LogFormatterParams) IsOutputColor() bool

IsOutputColor indicates whether can colors be outputted to the log.

func (*LogFormatterParams) MethodColor

func (p *LogFormatterParams) MethodColor() string

MethodColor is the ANSI color for appropriately logging http method to a terminal.

func (*LogFormatterParams) ResetColor

func (p *LogFormatterParams) ResetColor() string

ResetColor resets all escape attributes.

func (*LogFormatterParams) StatusCodeColor

func (p *LogFormatterParams) StatusCodeColor() string

StatusCodeColor is the ANSI color for appropriately logging http status code to a terminal.

type LoggerConfig

type LoggerConfig struct {
	// Optional. Default value is gin.defaultLogFormatter
	Formatter LogFormatter

	// Output is a writer where logs are written.
	// Optional. Default value is gin.DefaultWriter.
	Output io.Writer

	// SkipPaths is a url path array which logs are not written.
	// Optional.
	SkipPaths []string
}

LoggerConfig defines the config for Logger middleware.

type Negotiate

type Negotiate struct {
	Offered  []string
	HTMLName string
	HTMLData interface{}
	JSONData interface{}
	XMLData  interface{}
	YAMLData interface{}
	Data     interface{}
}

Negotiate contains all negotiations data.

type Param

type Param struct {
	Key   string
	Value string
}

Param is a single URL parameter, consisting of a key and a value.

type Params

type Params []Param

Params is a Param-slice, as returned by the router. The slice is ordered, the first URL parameter is also the first slice value. It is therefore safe to read values by the index.

func (Params) ByName

func (ps Params) ByName(name string) (va string)

ByName returns the value of the first Param which key matches the given name. If no matching Param is found, an empty string is returned.

func (Params) Get

func (ps Params) Get(name string) (string, bool)

Get returns the value of the first Param which key matches the given name and a boolean true. If no matching Param is found, an empty string is returned and a boolean false .

type RecoveryFunc

type RecoveryFunc func(c *Context, err interface{})

RecoveryFunc defines the function passable to CustomRecovery.

type ResponseWriter

type ResponseWriter interface {
	http.ResponseWriter
	http.Hijacker
	http.Flusher
	http.CloseNotifier

	// Returns the HTTP response status code of the current request.
	Status() int

	// Returns the number of bytes already written into the response http body.
	// See Written()
	Size() int

	// Writes the string into the response body.
	WriteString(string) (int, error)

	// Returns true if the response body was already written.
	Written() bool

	// Forces to write the http header (status code + headers).
	WriteHeaderNow()

	// get the http.Pusher for server push
	Pusher() http.Pusher
}

ResponseWriter ...

type RouteInfo

type RouteInfo struct {
	Method      string
	Path        string
	Handler     string
	HandlerFunc HandlerFunc
}

RouteInfo represents a request route's specification which contains method and path and its handler.

type RouterGroup

type RouterGroup struct {
	Handlers HandlersChain
	// contains filtered or unexported fields
}

RouterGroup is used internally to configure router, a RouterGroup is associated with a prefix and an array of handlers (middleware).

func (*RouterGroup) Any

func (group *RouterGroup) Any(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

Any registers a route that matches all the HTTP methods. GET, POST, PUT, PATCH, HEAD, OPTIONS, DELETE, CONNECT, TRACE.

func (*RouterGroup) BasePath

func (group *RouterGroup) BasePath() string

BasePath returns the base path of router group. For example, if v := router.Group("/rest/n/v1/api"), v.BasePath() is "/rest/n/v1/api".

func (*RouterGroup) DELETE

func (group *RouterGroup) DELETE(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

DELETE is a shortcut for router.Handle("DELETE", path, handle).

func (*RouterGroup) GET

func (group *RouterGroup) GET(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

GET is a shortcut for router.Handle("GET", path, handle).

func (*RouterGroup) Group

func (group *RouterGroup) Group(relativePath string, handlers ...HandlerFunc) *RouterGroup

Group creates a new router group. You should add all the routes that have common middlewares or the same path prefix. For example, all the routes that use a common middleware for authorization could be grouped.

func (*RouterGroup) HEAD

func (group *RouterGroup) HEAD(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

HEAD is a shortcut for router.Handle("HEAD", path, handle).

func (*RouterGroup) Handle

func (group *RouterGroup) Handle(httpMethod, relativePath, routeName string, handlers ...HandlerFunc) IRoutes

Handle registers a new request handle and middleware with the given path and method. The last handler should be the real handler, the other ones should be middleware that can and should be shared among different routes. See the example code in GitHub.

For GET, POST, PUT, PATCH and DELETE requests the respective shortcut functions can be used.

This function is intended for bulk loading and to allow the usage of less frequently used, non-standardized or custom methods (e.g. for internal communication with a proxy).

func (*RouterGroup) OPTIONS

func (group *RouterGroup) OPTIONS(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

OPTIONS is a shortcut for router.Handle("OPTIONS", path, handle).

func (*RouterGroup) PATCH

func (group *RouterGroup) PATCH(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

PATCH is a shortcut for router.Handle("PATCH", path, handle).

func (*RouterGroup) POST

func (group *RouterGroup) POST(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

POST is a shortcut for router.Handle("POST", path, handle).

func (*RouterGroup) PUT

func (group *RouterGroup) PUT(relativePath, routeName string, handlers ...HandlerFunc) IRoutes

PUT is a shortcut for router.Handle("PUT", path, handle).

func (*RouterGroup) Static

func (group *RouterGroup) Static(relativePath, root string) IRoutes

Static serves files from the given file system root. Internally a http.FileServer is used, therefore http.NotFound is used instead of the Router's NotFound handler. To use the operating system's file system implementation, use :

router.Static("/static", "/var/www")

func (*RouterGroup) StaticFS

func (group *RouterGroup) StaticFS(relativePath string, fs http.FileSystem) IRoutes

StaticFS works just like `Static()` but a custom `http.FileSystem` can be used instead. Gin by default user: gin.Dir()

func (*RouterGroup) StaticFile

func (group *RouterGroup) StaticFile(relativePath, filepath string) IRoutes

StaticFile registers a single route in order to serve a single file of the local filesystem. router.StaticFile("favicon.ico", "./resources/favicon.ico")

func (*RouterGroup) Use

func (group *RouterGroup) Use(middleware ...HandlerFunc) IRoutes

Use adds middleware to the group, see example code in GitHub.

type RoutesInfo

type RoutesInfo []RouteInfo

RoutesInfo defines a RouteInfo slice.