#Gin Web Framework [![GoDoc](https://godoc.org/github.com/gin-gonic/gin?status.png)](https://godoc.org/github.com/gin-gonic/gin) [![Build Status](https://travis-ci.org/gin-gonic/gin.svg)](https://travis-ci.org/gin-gonic/gin) Gin is a web framework written in Golang. It features a martini-like API with much better performance, up to 40 times faster. If you need performance and good productivity, you will love Gin. ![Gin console logger](http://gin-gonic.github.io/gin/other/console.png) ##Gin is new, will it be supported? Yes, Gin is an internal project of [my](https://github.com/manucorporat) upcoming startup. We developed it and we are going to continue using and improve it. ##Roadmap for v0.2 - Performance improments, reduce allocation and garbage collection overhead - Fix bugs - Ask our designer for a cool logo - Add tons of unit tests and benchmarks - Improve logging system - Improve JSON/XML validation using bindings - Improve XML support - Improve documentation - Add more cool middlewares, for example redis catching (this also helps developers to understand the framework) - Continuous integration ## Start using it Obviously, you need to have Git and Go! already installed to run Gin. Run this in your terminal ``` go get github.com/gin-gonic/gin ``` Then import it in your Go! code: ``` import "github.com/gin-gonic/gin" ``` ##API Examples #### Create most basic PING/PONG HTTP endpoint ```go package main import "github.com/gin-gonic/gin" func main() { r := gin.Default() r.GET("/ping", func(c *gin.Context) { c.String(200, "pong") }) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### Using GET, POST, PUT, PATCH, DELETE and OPTIONS ```go func main() { // Creates a gin router + logger and recovery (crash-free) middlewares r := gin.Default() r.GET("/someGet", getting) r.POST("/somePost", posting) r.PUT("/somePut", putting) r.DELETE("/someDelete", deleting) r.PATCH("/somePatch", patching) r.HEAD("/someHead", head) r.OPTIONS("/someOptions", options) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### Parameters in path ```go func main() { r := gin.Default() r.GET("/user/:name", func(c *gin.Context) { name := c.Params.ByName("name") message := "Hello "+name c.String(200, message) }) r.GET("/user/:name/:action", func(c *gin.Context) { name := c.Params.ByName("name") action := c.Params.ByName("action") message := name + " is " + action c.String(200, message) }) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### Grouping routes ```go func main() { r := gin.Default() // Simple group: v1 v1 := r.Group("/v1") { v1.POST("/login", loginEndpoint) v1.POST("/submit", submitEndpoint) v1.POST("/read", readEndpoint) } // Simple group: v2 v2 := r.Group("/v2") { v2.POST("/login", loginEndpoint) v2.POST("/submit", submitEndpoint) v2.POST("/read", readEndpoint) } // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### Blank Gin without middlewares by default Use ```go r := gin.New() ``` instead of ```go r := gin.Default() ``` #### Using middlewares ```go func main() { // Creates a router without any middleware by default r := gin.New() // Global middlewares r.Use(gin.Logger()) r.Use(gin.Recovery()) // Per route middlewares, you can add as many as you desire. r.GET("/benchmark", MyBenchLogger(), benchEndpoint) // Authorization group // authorized := r.Group("/", AuthRequired()) // exactly the same than: authorized := r.Group("/") // per group middlewares! 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 server on 0.0.0.0:8080 r.Run(":8080") } ``` #### JSON parsing and validation ```go type LoginJSON struct { User string `json:"user" binding:"required"` Password string `json:"password" binding:"required"` } func main() { r := gin.Default() r.POST("/login", func(c *gin.Context) { var json LoginJSON // If EnsureBody returns false, it will write automatically the error // in the HTTP stream and return a 400 error. If you want custom error // handling you should use: c.ParseBody(interface{}) error if c.EnsureBody(&json) { if json.User == "manu" && json.Password == "123" { c.JSON(200, gin.H{"status": "you are logged in"}) } else { c.JSON(401, gin.H{"status": "unauthorized"}) } } }) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### XML, and JSON rendering ```go func main() { r := gin.Default() // gin.H is a shortcup for map[string]interface{} r.GET("/someJSON", func(c *gin.Context) { c.JSON(200, gin.H{"message": "hey", "status": 200}) }) 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(200, msg) }) r.GET("/someXML", func(c *gin.Context) { c.XML(200, gin.H{"message": "hey", "status": 200}) }) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` ####HTML rendering Using LoadHTMLTemplates() ```go func main() { r := gin.Default() r.LoadHTMLTemplates("templates/*") r.GET("/index", func(c *gin.Context) { obj := gin.H{"title": "Main website"} c.HTML(200, "index.tmpl", obj) }) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` You can also use your own html template render ```go import "html/template" func main() { r := gin.Default() html := template.Must(template.ParseFiles("file1", "file2")) r.HTMLTemplates = html // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### Custom Middlewares ```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 := r.Get("example").(string) // it would print: "12345" log.Println(example) }) // Listen and server on 0.0.0.0:8080 r.Run(":8080") } ``` #### Using BasicAuth() middleware ```go // similate 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 setted by the BasicAuth middleware user := c.Get(gin.AuthUserKey).(string) if secret, ok := secrets[user]; ok { c.JSON(200, gin.H{"user": user, "secret": secret}) } else { c.JSON(200, gin.H{"user": user, "secret": "NO SECRET :("}) } }) // Listen and server 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 c_cp := c.Copy() go func() { // simulate a long task with time.Sleep(). 5 seconds time.Sleep(5 * time.Second) // note than you are using the copied context "c_cp", IMPORTANT log.Println("Done! in path " + c_cp.Req.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.Req.URL.Path) }) // Listen and server 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() } ```