go gin server初体验

gin可用作go环境的web server, 很好用，来玩下：

1. go get github.com/gin-gonic/gin 下载并安装gin库

结果出现：go build github.com/ugorji/go/codec: /usr/lib/go-1.6/pkg/tool/linux_amd64/compile: signal: killed

在网上查了一下，是oom所致，用dmesg确认了一下，果然如此：

[114220.386131] [ 4027]   500  4027    20792      155      41       4        0             0 curl
[114220.386132] Out of memory: Kill process 4018 (compile) score 542 or sacrifice child
[114220.387049] Killed process 4018 (compile) total-vm:492476kB, anon-rss:478772kB, file-rss:0kB

买的腾讯云机器，内存小，晕。

索性重启ubuntu, 再go get github.com/gin-gonic/gin一下，就OK了。

2. 写服务s.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
}

go run s.go跑起来

3. 发请求：

ubuntu@VM-0-15-ubuntu:~$ curl "http://localhost/ping"
curl: (7) Failed to connect to localhost port 80: Connection refused
ubuntu@VM-0-15-ubuntu:~$ 
ubuntu@VM-0-15-ubuntu:~$ curl "http://localhost:8080/ping"
{"message":"pong"}ubuntu@VM-0-15-ubuntu:~$

收到请求了。

另外，注意到：

ubuntu@VM-0-15-ubuntu:~/taoge/go$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/ubuntu/go"
GORACE=""
GOROOT="/usr/lib/go-1.6"
GOTOOLDIR="/usr/lib/go-1.6/pkg/tool/linux_amd64"
GO15VENDOREXPERIMENT="1"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
CXX="g++"
CGO_ENABLED="1"

我们去GOPATH路径下看下：

ubuntu@VM-0-15-ubuntu:~/go/src/github.com/gin-gonic/gin$ pwd
/home/ubuntu/go/src/github.com/gin-gonic/gin
ubuntu@VM-0-15-ubuntu:~/go/src/github.com/gin-gonic/gin$ ls
auth.go             context_17_test.go    doc.go                   internal            README.md                routes_test.go
AUTHORS.md          context_appengine.go  errors.go                LICENSE             recovery.go              testdata
auth_test.go        context.go            errors_test.go           logger.go           recovery_test.go         test_helpers.go
BENCHMARKS.md       context_test.go       examples                 logger_test.go      render                   tree.go
benchmarks_test.go  CONTRIBUTING.md       fs.go                    Makefile            response_writer_1.7.go   tree_test.go
binding             coverage.sh           gin.go                   middleware_test.go  response_writer_1.8.go   utils.go
CHANGELOG.md        debug.go              gin_integration_test.go  mode.go             response_writer.go       utils_test.go
codecov.yml         debug_test.go         ginS                     mode_test.go        response_writer_test.go  vendor
CODE_OF_CONDUCT.md  deprecated.go         gin_test.go              path.go             routergroup.go           wercker.yml
context_17.go       deprecated_test.go    githubapi_test.go        path_test.go        routergroup_test.go
ubuntu@VM-0-15-ubuntu:~/go/src/github.com/gin-gonic/gin$

这就是gin对应的包所在的目录。

gin server可以吐回单纯的文本串，也自然能吐回html, 让浏览器来显示, s.go代码为：

package main
 
import (
    "github.com/gin-gonic/gin"
    "net/http"
)
 
func first(c *gin.Context) {
    s := `
        <html">
            <body>        
                <input type="text" name="admin_name"></input></td>
            </body>
        </html>
    `

    c.Header("Content-Type", "text/html; charset=utf-8") // 不可少
    c.String(http.StatusOK, "%s", s)
}

func main() {
    r := gin.Default()
    r.GET("/", first)
    r.Run(":8080")
}

gin功能很强大，如上仅仅是简单demo.

不多说。

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