mirror of https://github.com/gin-gonic/gin.git
1007 lines
23 KiB
Markdown
1007 lines
23 KiB
Markdown
# Gin Web Framework
|
|
|
|
<img align="right" width="159px" src="https://raw.githubusercontent.com/gin-gonic/gin/master/logo.png">
|
|
|
|
[](https://travis-ci.org/gin-gonic/gin)
|
|
[](https://codecov.io/gh/gin-gonic/gin)
|
|
[](https://goreportcard.com/report/github.com/gin-gonic/gin)
|
|
[](https://godoc.org/github.com/gin-gonic/gin)
|
|
[](https://gitter.im/gin-gonic/gin?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
|
|
|
Gin is a web framework written in Go (Golang). It features a martini-like API with much better performance, up to 40 times faster thanks to [httprouter](https://github.com/julienschmidt/httprouter). If you need performance and good productivity, you will love Gin.
|
|
|
|
|
|
|
|
```sh
|
|
# assume the following codes in example.go file
|
|
$ cat example.go
|
|
```
|
|
|
|
```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
|
|
}
|
|
```
|
|
|
|
```
|
|
# run example.go and visit 0.0.0.0:8080/ping on browser
|
|
$ go run example.go
|
|
```
|
|
|
|
## Benchmarks
|
|
|
|
Gin uses a custom version of [HttpRouter](https://github.com/julienschmidt/httprouter)
|
|
|
|
[See all benchmarks](/BENCHMARKS.md)
|
|
|
|
|
|
Benchmark name | (1) | (2) | (3) | (4)
|
|
--------------------------------|----------:|----------:|----------:|------:
|
|
BenchmarkAce_GithubAll | 10000 | 109482 | 13792 | 167
|
|
BenchmarkBear_GithubAll | 10000 | 287490 | 79952 | 943
|
|
BenchmarkBeego_GithubAll | 3000 | 562184 | 146272 | 2092
|
|
BenchmarkBone_GithubAll | 500 | 2578716 | 648016 | 8119
|
|
BenchmarkDenco_GithubAll | 20000 | 94955 | 20224 | 167
|
|
BenchmarkEcho_GithubAll | 30000 | 58705 | 0 | 0
|
|
**BenchmarkGin_GithubAll** | **30000** | **50991** | **0** | **0**
|
|
BenchmarkGocraftWeb_GithubAll | 5000 | 449648 | 133280 | 1889
|
|
BenchmarkGoji_GithubAll | 2000 | 689748 | 56113 | 334
|
|
BenchmarkGoJsonRest_GithubAll | 5000 | 537769 | 135995 | 2940
|
|
BenchmarkGoRestful_GithubAll | 100 | 18410628 | 797236 | 7725
|
|
BenchmarkGorillaMux_GithubAll | 200 | 8036360 | 153137 | 1791
|
|
BenchmarkHttpRouter_GithubAll | 20000 | 63506 | 13792 | 167
|
|
BenchmarkHttpTreeMux_GithubAll | 10000 | 165927 | 56112 | 334
|
|
BenchmarkKocha_GithubAll | 10000 | 171362 | 23304 | 843
|
|
BenchmarkMacaron_GithubAll | 2000 | 817008 | 224960 | 2315
|
|
BenchmarkMartini_GithubAll | 100 | 12609209 | 237952 | 2686
|
|
BenchmarkPat_GithubAll | 300 | 4830398 | 1504101 | 32222
|
|
BenchmarkPossum_GithubAll | 10000 | 301716 | 97440 | 812
|
|
BenchmarkR2router_GithubAll | 10000 | 270691 | 77328 | 1182
|
|
BenchmarkRevel_GithubAll | 1000 | 1491919 | 345553 | 5918
|
|
BenchmarkRivet_GithubAll | 10000 | 283860 | 84272 | 1079
|
|
BenchmarkTango_GithubAll | 5000 | 473821 | 87078 | 2470
|
|
BenchmarkTigerTonic_GithubAll | 2000 | 1120131 | 241088 | 6052
|
|
BenchmarkTraffic_GithubAll | 200 | 8708979 | 2664762 | 22390
|
|
BenchmarkVulcan_GithubAll | 5000 | 353392 | 19894 | 609
|
|
BenchmarkZeus_GithubAll | 2000 | 944234 | 300688 | 2648
|
|
|
|
(1): Total Repetitions
|
|
(2): Single Repetition Duration (ns/op)
|
|
(3): Heap Memory (B/op)
|
|
(4): Average Allocations per Repetition (allocs/op)
|
|
|
|
## Gin v1. stable
|
|
|
|
- [x] Zero allocation router.
|
|
- [x] Still the fastest http router and framework. From routing to writing.
|
|
- [x] Complete suite of unit tests
|
|
- [x] Battle tested
|
|
- [x] API frozen, new releases will not break your code.
|
|
|
|
|
|
## Start using it
|
|
|
|
1. Download and install it:
|
|
|
|
```sh
|
|
$ go get github.com/gin-gonic/gin
|
|
```
|
|
|
|
2. Import it in your code:
|
|
|
|
```go
|
|
import "github.com/gin-gonic/gin"
|
|
```
|
|
|
|
3. (Optional) Import `net/http`. This is required for example if using constants such as `http.StatusOK`.
|
|
|
|
```go
|
|
import "net/http"
|
|
```
|
|
|
|
### Use a vendor tool like [Govendor](https://github.com/kardianos/govendor)
|
|
|
|
1. `go get` govendor
|
|
|
|
```sh
|
|
$ go get github.com/kardianos/govendor
|
|
```
|
|
2. Create your project folder and `cd` inside
|
|
|
|
```sh
|
|
$ mkdir -p ~/go/src/github.com/myusername/project && cd "$_"
|
|
```
|
|
|
|
3. Vendor init your project and add gin
|
|
|
|
```sh
|
|
$ govendor init
|
|
$ govendor fetch github.com/gin-gonic/gin@v1.2
|
|
```
|
|
|
|
4. Copy a starting template inside your project
|
|
|
|
```sh
|
|
$ curl https://raw.githubusercontent.com/gin-gonic/gin/master/examples/basic/main.go > main.go
|
|
```
|
|
|
|
5. Run your project
|
|
|
|
```sh
|
|
$ go run main.go
|
|
```
|
|
|
|
## API Examples
|
|
|
|
### Using GET, POST, PUT, PATCH, DELETE and OPTIONS
|
|
|
|
```go
|
|
func main() {
|
|
// Disable Console Color
|
|
// gin.DisableConsoleColor()
|
|
|
|
// 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
|
|
|
|
```go
|
|
func main() {
|
|
router := gin.Default()
|
|
|
|
// This handler will match /user/john but will not match neither /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)
|
|
})
|
|
|
|
router.Run(":8080")
|
|
}
|
|
```
|
|
|
|
### Querystring parameters
|
|
|
|
```go
|
|
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
|
|
|
|
```go
|
|
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
|
|
```
|
|
|
|
```go
|
|
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
|
|
```
|
|
|
|
### Upload files
|
|
|
|
#### Single file
|
|
|
|
References issue [#774](https://github.com/gin-gonic/gin/issues/774) and detail [example code](examples/upload-file/single).
|
|
|
|
```go
|
|
func main() {
|
|
router := gin.Default()
|
|
router.POST("/upload", func(c *gin.Context) {
|
|
// single file
|
|
file, _ := c.FormFile("file")
|
|
log.Println(file.Filename)
|
|
|
|
c.String(http.StatusOK, fmt.Printf("'%s' uploaded!", file.Filename))
|
|
})
|
|
router.Run(":8080")
|
|
}
|
|
```
|
|
|
|
How to `curl`:
|
|
|
|
```bash
|
|
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](examples/upload-file/multiple).
|
|
|
|
```go
|
|
func main() {
|
|
router := gin.Default()
|
|
router.POST("/upload", func(c *gin.Context) {
|
|
// Multipart form
|
|
form, _ := c.MultipartForm()
|
|
files := form.File["upload[]"]
|
|
|
|
for _, file := range files {
|
|
log.Println(file.Filename)
|
|
}
|
|
c.String(http.StatusOK, fmt.Printf("%d files uploaded!", len(files)))
|
|
})
|
|
router.Run(":8080")
|
|
}
|
|
```
|
|
|
|
How to `curl`:
|
|
|
|
```bash
|
|
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
|
|
|
|
```go
|
|
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
|
|
|
|
```go
|
|
r := gin.New()
|
|
```
|
|
|
|
instead of
|
|
|
|
```go
|
|
r := gin.Default()
|
|
```
|
|
|
|
|
|
### Using middleware
|
|
```go
|
|
func main() {
|
|
// Creates a router without any middleware by default
|
|
r := gin.New()
|
|
|
|
// Global middleware
|
|
r.Use(gin.Logger())
|
|
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")
|
|
}
|
|
```
|
|
|
|
### Model binding and validation
|
|
|
|
To bind a request body into a type, use model binding. We currently support binding of JSON, XML and standard form values (foo=bar&boo=baz).
|
|
|
|
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"`.
|
|
|
|
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 BindWith.
|
|
|
|
You can also specify that specific fields are required. If a field is decorated with `binding:"required"` and has a empty value when binding, the current request will fail with an error.
|
|
|
|
```go
|
|
// Binding from JSON
|
|
type Login struct {
|
|
User string `form:"user" json:"user" binding:"required"`
|
|
Password string `form:"password" json:"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 c.BindJSON(&json) == nil {
|
|
if json.User == "manu" && json.Password == "123" {
|
|
c.JSON(http.StatusOK, gin.H{"status": "you are logged in"})
|
|
} else {
|
|
c.JSON(http.StatusUnauthorized, gin.H{"status": "unauthorized"})
|
|
}
|
|
}
|
|
})
|
|
|
|
// 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 c.Bind(&form) == nil {
|
|
if form.User == "manu" && form.Password == "123" {
|
|
c.JSON(http.StatusOK, gin.H{"status": "you are logged in"})
|
|
} else {
|
|
c.JSON(http.StatusUnauthorized, gin.H{"status": "unauthorized"})
|
|
}
|
|
}
|
|
})
|
|
|
|
// Listen and serve on 0.0.0.0:8080
|
|
router.Run(":8080")
|
|
}
|
|
```
|
|
|
|
### Bind Query String
|
|
|
|
See the [detail information](https://github.com/gin-gonic/gin/issues/742#issuecomment-264681292).
|
|
|
|
```go
|
|
package main
|
|
|
|
import "log"
|
|
import "github.com/gin-gonic/gin"
|
|
|
|
type Person struct {
|
|
Name string `form:"name"`
|
|
Address string `form:"address"`
|
|
}
|
|
|
|
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/develop/binding/binding.go#L45
|
|
if c.Bind(&person) == nil {
|
|
log.Println(person.Name)
|
|
log.Println(person.Address)
|
|
}
|
|
|
|
c.String(200, "Success")
|
|
}
|
|
```
|
|
|
|
### Multipart/Urlencoded binding
|
|
|
|
```go
|
|
package main
|
|
|
|
import (
|
|
"github.com/gin-gonic/gin"
|
|
)
|
|
|
|
type LoginForm struct {
|
|
User string `form:"user" binding:"required"`
|
|
Password string `form:"password" binding:"required"`
|
|
}
|
|
|
|
func main() {
|
|
router := gin.Default()
|
|
router.POST("/login", func(c *gin.Context) {
|
|
// you can bind multipart form with explicit binding declaration:
|
|
// c.MustBindWith(&form, binding.Form)
|
|
// or you can simply use autobinding with Bind method:
|
|
var form LoginForm
|
|
// in this case proper binding will be automatically selected
|
|
if c.Bind(&form) == nil {
|
|
if form.User == "user" && form.Password == "password" {
|
|
c.JSON(200, gin.H{"status": "you are logged in"})
|
|
} else {
|
|
c.JSON(401, gin.H{"status": "unauthorized"})
|
|
}
|
|
}
|
|
})
|
|
router.Run(":8080")
|
|
}
|
|
```
|
|
|
|
Test it with:
|
|
```sh
|
|
$ curl -v --form user=user --form password=password http://localhost:8080/login
|
|
```
|
|
|
|
### XML, JSON and YAML rendering
|
|
|
|
```go
|
|
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})
|
|
})
|
|
|
|
// Listen and serve on 0.0.0.0:8080
|
|
r.Run(":8080")
|
|
}
|
|
```
|
|
|
|
### Serving static files
|
|
|
|
```go
|
|
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")
|
|
}
|
|
```
|
|
|
|
### HTML rendering
|
|
|
|
Using LoadHTMLGlob() or LoadHTMLFiles()
|
|
|
|
```go
|
|
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
|
|
<html>
|
|
<h1>
|
|
{{ .title }}
|
|
</h1>
|
|
</html>
|
|
```
|
|
|
|
Using templates with same name in different directories
|
|
|
|
```go
|
|
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
|
|
|
|
```html
|
|
{{ define "posts/index.tmpl" }}
|
|
<html><h1>
|
|
{{ .title }}
|
|
</h1>
|
|
<p>Using posts/index.tmpl</p>
|
|
</html>
|
|
{{ end }}
|
|
```
|
|
|
|
templates/users/index.tmpl
|
|
|
|
```html
|
|
{{ 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
|
|
|
|
```go
|
|
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
|
|
|
|
```go
|
|
r := gin.Default()
|
|
r.Delims("{[{", "}]}")
|
|
r.LoadHTMLGlob("/path/to/templates"))
|
|
```
|
|
|
|
#### Custom Template Funcs
|
|
|
|
main.go
|
|
|
|
```go
|
|
...
|
|
|
|
func formatAsDate(t time.Time) string {
|
|
year, month, day := t.Date()
|
|
return fmt.Sprintf("%d/%02d/%02d", year, month, day)
|
|
}
|
|
|
|
...
|
|
|
|
router.SetFuncMap(template.FuncMap{
|
|
"formatAsDate": formatAsDate,
|
|
})
|
|
|
|
...
|
|
|
|
router.GET("/raw", func(c *Context) {
|
|
c.HTML(http.StatusOK, "raw.tmpl", map[string]interface{}{
|
|
"now": time.Date(2017, 07, 01, 0, 0, 0, 0, time.UTC),
|
|
})
|
|
})
|
|
|
|
...
|
|
```
|
|
|
|
raw.tmpl
|
|
|
|
```html
|
|
Date: {[{.now | formatAsDate}]}
|
|
```
|
|
|
|
Result:
|
|
```
|
|
Date: 2017/07/01
|
|
```
|
|
|
|
### Multitemplate
|
|
|
|
Gin allow by default use only one html.Template. Check [a multitemplate render](https://github.com/gin-contrib/multitemplate) for using features like go 1.6 `block template`.
|
|
|
|
### Redirects
|
|
|
|
Issuing a HTTP redirect is easy:
|
|
|
|
```go
|
|
r.GET("/test", func(c *gin.Context) {
|
|
c.Redirect(http.StatusMovedPermanently, "http://www.google.com/")
|
|
})
|
|
```
|
|
Both internal and external locations are supported.
|
|
|
|
|
|
### Custom Middleware
|
|
|
|
```go
|
|
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
|
|
|
|
```go
|
|
// 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 inside a middleware or handler, you **SHOULD NOT** use the original context inside it, you have to use a read-only copy.
|
|
|
|
```go
|
|
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:
|
|
|
|
```go
|
|
func main() {
|
|
router := gin.Default()
|
|
http.ListenAndServe(":8080", router)
|
|
}
|
|
```
|
|
or
|
|
|
|
```go
|
|
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.
|
|
|
|
[embedmd]:# (examples/auto-tls/example1.go go)
|
|
```go
|
|
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.
|
|
|
|
[embedmd]:# (examples/auto-tls/example2.go go)
|
|
```go
|
|
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))
|
|
}
|
|
```
|
|
|
|
### 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](https://github.com/fvbock/endless) to replace the default `ListenAndServe`. Refer issue [#296](https://github.com/gin-gonic/gin/issues/296) for more details.
|
|
|
|
```go
|
|
router := gin.Default()
|
|
router.GET("/", handler)
|
|
// [...]
|
|
endless.ListenAndServe(":4242", router)
|
|
```
|
|
|
|
An alternative to endless:
|
|
|
|
* [manners](https://github.com/braintree/manners): A polite Go HTTP server that shuts down gracefully.
|
|
* [graceful](https://github.com/tylerb/graceful): Graceful is a Go package enabling graceful shutdown of an http.Handler server.
|
|
* [grace](https://github.com/facebookgo/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()](https://golang.org/pkg/net/http/#Server.Shutdown) method for graceful shutdowns. See the full [graceful-shutdown](./examples/graceful-shutdown) example with gin.
|
|
|
|
[embedmd]:# (examples/graceful-shutdown/graceful-shutdown/server.go go)
|
|
```go
|
|
// +build go1.8
|
|
|
|
package main
|
|
|
|
import (
|
|
"context"
|
|
"log"
|
|
"net/http"
|
|
"os"
|
|
"os/signal"
|
|
"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 {
|
|
log.Printf("listen: %s\n", err)
|
|
}
|
|
}()
|
|
|
|
// Wait for interrupt signal to gracefully shutdown the server with
|
|
// a timeout of 5 seconds.
|
|
quit := make(chan os.Signal)
|
|
signal.Notify(quit, os.Interrupt)
|
|
<-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)
|
|
}
|
|
log.Println("Server exist")
|
|
}
|
|
```
|
|
|
|
## Users [](https://sourcegraph.com/github.com/gin-gonic/gin?badge)
|
|
|
|
Awesome project lists using [Gin](https://github.com/gin-gonic/gin) web framework.
|
|
|
|
* [drone](https://github.com/drone/drone): Drone is a Continuous Delivery platform built on Docker, written in Go
|
|
* [gorush](https://github.com/appleboy/gorush): A push notification server written in Go.
|