forked from mirror/gin
316 lines
6.5 KiB
Markdown
316 lines
6.5 KiB
Markdown
#Gin Web Framework
|
|
|
|
[](https://godoc.org/github.com/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.
|
|
[Check out the official web site](http://gin-gonic.github.io/gin/)
|
|
|
|
## Start using it
|
|
Run:
|
|
|
|
```
|
|
go get github.com/gin-gonic/gin
|
|
```
|
|
Then import it in your Golang code:
|
|
|
|
```
|
|
import "github.com/gin-gonic/gin"
|
|
```
|
|
|
|
|
|
##API Examples
|
|
|
|
#### Create most basic PING/PONG HTTP endpoint
|
|
```go
|
|
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 and DELETE
|
|
|
|
```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)
|
|
|
|
// 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)
|
|
})
|
|
|
|
// 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.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)
|
|
}
|
|
}
|
|
|
|
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")
|
|
}
|
|
```
|
|
|
|
|
|
|
|
|
|
#### 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()
|
|
}
|
|
```
|