Gin 10

[root@h160 ~]# hostnamectl 
   Static hostname: h160
         Icon name: computer-vm
           Chassis: vm
        Machine ID: d46f9440d4be429ea66b726977adf233
           Boot ID: a0fc6a1b4f124e39a27866d4df0701fa
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-862.2.3.el7.x86_64
      Architecture: x86-64
[root@h160 ~]# ip a 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:c9:c7:04 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global noprefixroute dynamic eth0
       valid_lft 84363sec preferred_lft 84363sec
    inet6 fe80::5054:ff:fec9:c704/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:48:f4:2c brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.160/24 brd 192.168.56.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe48:f42c/64 scope link 
       valid_lft forever preferred_lft forever
[root@h160 ~]# go version
go version go1.9.4 linux/amd64
[root@h160 ~]#

[vagrant@h160 ~]$ echo $GOPATH
/vagrant/go
[vagrant@h160 ~]$ cd $GOPATH
[vagrant@h160 go]$ pwd
/vagrant/go
[vagrant@h160 go]$ 

package main //指明此包为 main 包

import ( //使用这种方式导入多个包可以更为简洁
	"io" //io 包可以提供基础的接口以进行I/O类操作
	"os" //os 包可以提供抽象的操作系统函数

	"github.com/gin-gonic/gin" //导入 gin 包
)

func main() { // 一个main包中有且只有一个main 函数
	gin.DisableConsoleColor()                        //DisableConsoleColor 在console 中关闭彩色输出.
	f, _ := os.Create("gin.log")                     //func Create(name string) (*File, error) 接受一个文件名字符串，反馈一个文件指针，和一个错误输出
	gin.DefaultWriter = io.MultiWriter(f, os.Stdout) //将输出写出到文件与终端各一份
	r := gin.Default()                               // 使用 gin.Default() 方法生成一个引擎实例,这个实例默认情况下已经将 Logger Recovery 进行了装载
	r.GET("/ping", func(c *gin.Context) {            //func (group *RouterGroup) GET(relativePath string, handlers ...HandlerFunc) IRoutes　,定义一个接受 /ping 的路由
		c.String(200, "pong") //给客户反馈 pong
	})
	r.Run(":8080") //在 0.0.0.0:8080 上启监听
}

[vagrant@h160 go]$ go run hello.go 
[GIN-debug] [WARNING] Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.

[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:	export GIN_MODE=release
 - using code:	gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /ping                     --> main.main.func1 (3 handlers)
[GIN-debug] Listening and serving HTTP on :8080
[GIN] 2018/07/10 - 15:08:49 | 200 |     130.945µs |  192.168.56.105 | GET      /ping
[GIN] 2018/07/10 - 15:09:37 | 200 |      28.593µs |  192.168.56.105 | GET      /ping
...
...
...

[vagrant@h105 ~]$ curl 192.168.56.160:8080/ping
pong[vagrant@h105 ~]$ curl 192.168.56.160:8080/ping
pong[vagrant@h105 ~]$ 
[vagrant@h105 ~]$ 

[vagrant@h160 go]$ ll 
total 20
drwxrwxr-x. 2 vagrant vagrant 4096 Jul  9 15:11 bin
-rw-rw-r--. 1 vagrant vagrant   86 Jul 10 15:09 gin.log
-rw-rw-r--. 1 vagrant vagrant 1157 Jul 10 15:07 hello.go
drwxrwxr-x. 3 vagrant vagrant 4096 Jul  4 16:05 pkg
drwxrwxr-x. 5 vagrant vagrant 4096 Jul  9 14:27 src
[vagrant@h160 go]$ ll gin.log 
-rw-rw-r--. 1 vagrant vagrant 86 Jul 10 15:09 gin.log
[vagrant@h160 go]$ cat gin.log 
[GIN] 2018/07/10 - 15:08:49 | 200 |     130.945µs |  192.168.56.105 | GET      /ping
[vagrant@h160 go]$ tail -f gin.log 
[GIN] 2018/07/10 - 15:08:49 | 200 |     130.945µs |  192.168.56.105 | GET      /ping
[GIN] 2018/07/10 - 15:09:37 | 200 |      28.593µs |  192.168.56.105 | GET      /ping
...
...
...