Categorygithub.com/skarm/echo

modulepackage

3.0.1+incompatible

Repository: https://github.com/skarm/echo.git

Documentation: pkg.go.dev

# README

echo.labstack.com)

Fast and unfancy HTTP server framework for Go (Golang).

Feature Overview

Optimized HTTP router which smartly prioritize routes
Build robust and scalable RESTful APIs
Group APIs
Extensible middleware framework
Define middleware at root, group or route level
Data binding for JSON, XML and form payload
Handy functions to send variety of HTTP responses
Centralized HTTP error handling
Template rendering with any template engine
Define your format for the logger
Highly customizable
Automatic TLS via Let’s Encrypt
Built-in graceful shutdown

Performance

Quick Start

Installation

$ go get -u github.com/labstack/echo

Hello, World!

Create server.go

package main

import (
	"net/http"
	
	"github.com/labstack/echo"
)

func main() {
	e := echo.New()
	e.GET("/", func(c echo.Context) error {
		return c.String(http.StatusOK, "Hello, World!")
	})

	if err := e.Start(":1323"); err != nil {
		e.Logger.Fatal(err.Error())
	}
}

Start server

$ go run server.go

Browse to http://localhost:1323 and you should see Hello, World! on the page.

Routing

e.POST("/users", saveUser)
e.GET("/users/:id", getUser)
e.PUT("/users/:id", updateUser)
e.DELETE("/users/:id", deleteUser)

Path Parameters

// e.GET("/users/:id", getUser)
func getUser(c echo.Context) error {
  	// User ID from path `users/:id`
  	id := c.Param("id")
	return c.String(http.StatusOK, id)
}

Browse to http://localhost:1323/users/Joe and you should see 'Joe' on the page.

Query Parameters

/show?team=x-men&member=wolverine

//e.GET("/show", show)
func show(c echo.Context) error {
	// Get team and member from the query string
	team := c.QueryParam("team")
	member := c.QueryParam("member")
	return c.String(http.StatusOK, "team:" + team + ", member:" + member)
}

Browse to http://localhost:1323/show?team=x-men&member=wolverine and you should see 'team:x-men, member:wolverine' on the page.

Form `application/x-www-form-urlencoded`

POST /save

name	value
name	Joe Smith
email	[email protected]

// e.POST("/save", save)
func save(c echo.Context) error {
	// Get name and email
	name := c.FormValue("name")
	email := c.FormValue("email")
	return c.String(http.StatusOK, "name:" + name + ", email:" + email)
}

Run the following command:

$ curl -F "name=Joe Smith" -F "[email protected]" http://localhost:1323/save
// => name:Joe Smith, email:[email protected]

Form `multipart/form-data`

POST /save

name	value
name	Joe Smith
avatar	avatar

func save(c echo.Context) error {
	// Get name
	name := c.FormValue("name")
	// Get avatar
  	avatar, err := c.FormFile("avatar")
  	if err != nil {
 		return err
 	}
 
 	// Source
 	src, err := avatar.Open()
 	if err != nil {
 		return err
 	}
 	defer src.Close()
 
 	// Destination
 	dst, err := os.Create(avatar.Filename)
 	if err != nil {
 		return err
 	}
 	defer dst.Close()
 
 	// Copy
 	if _, err = io.Copy(dst, src); err != nil {
  		return err
  	}

	return c.HTML(http.StatusOK, "<b>Thank you! " + name + "</b>")
}

Run the following command.

$ curl -F "name=Joe Smith" -F "avatar=@/path/to/your/avatar.png" http://localhost:1323/save
// => <b>Thank you! Joe Smith</b>

For checking uploaded image, run the following command.

cd <project directory>
ls avatar.png
// => avatar.png

Handling Request

Bind JSON or XML or form payload into Go struct based on Content-Type request header.
Render response as JSON or XML with status code.

type User struct {
	Name  string `json:"name" xml:"name" form:"name"`
	Email string `json:"email" xml:"email" form:"email"`
}

e.POST("/users", func(c echo.Context) error {
	u := new(User)
	if err := c.Bind(u); err != nil {
		return err
	}
	return c.JSON(http.StatusCreated, u)
	// or
	// return c.XML(http.StatusCreated, u)
})

Static Content

Server any file from static directory for path /static/*.

e.Static("/static", "static")

Learn More

Template Rendering

Middleware

// Root level middleware
e.Use(middleware.Logger())
e.Use(middleware.Recover())

// Group level middleware
g := e.Group("/admin")
g.Use(middleware.BasicAuth(func(username, password string) bool {
	if username == "joe" && password == "secret" {
		return true
	}
	return false
}))

// Route level middleware
track := func(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		println("request to /users")
		return next(c)
	}
}
e.GET("/users", func(c echo.Context) error {
	return c.String(http.StatusOK, "/users")
}, track)

Built-in Middleware

Middleware	Description
BodyLimit	Limit request body
Logger	Log HTTP requests
Recover	Recover from panics
Gzip	Send gzip HTTP response
BasicAuth	HTTP basic authentication
JWTAuth	JWT authentication
Secure	Protection against attacks
CORS	Cross-Origin Resource Sharing
CSRF	Cross-Site Request Forgery
HTTPSRedirect	Redirect HTTP requests to HTTPS
HTTPSWWWRedirect	Redirect HTTP requests to WWW HTTPS
WWWRedirect	Redirect non WWW requests to WWW
NonWWWRedirect	Redirect WWW requests to non WWW
AddTrailingSlash	Add trailing slash to the request URI
RemoveTrailingSlash	Remove trailing slash from the request URI
MethodOverride	Override request method