gorilla/mux实现http服务示例

gorilla/mux 小巧玲珑而十分高效，兼容go自带的http。下载源码到本地，编写如下示例：

package main

import (
    "encoding/json"
    "fmt"
    "github.com/gorilla/mux"
    "io/ioutil"
    "net/http"
    "runtime/debug"
    "time"
)

//错误码常量
const (
    INVALID_BODY = 1
    INVALID_PARA = 2
    INNER_ERROR  = 3
)

//请求包体
type Req struct {
    Msg string `json:"msg"`
}

//回复包体
type Rsp struct {
    Status int64       `json:"status"`
    Msg    string      `json:"msg"`
    Data   interface{} `json:"data,omitempty"`
}

//路由器
var Router *mux.Router
type Process func(query map[string][]string, body []byte, rsp *Rsp)

func GenHandler(pro Process) func(w http.ResponseWriter, r *http.Request) {
    return func(w http.ResponseWriter, r *http.Request) {
        //url param
        query := r.URL.Query()
        //post data
        sbody, e := ioutil.ReadAll(r.Body)
        defer r.Body.Close()
        if e != nil {
            w.WriteHeader(500)
            return
        }
        //process
        var rsp Rsp
        fmt.Printf("Req : %v\n", string(sbody))
        pro(query, sbody, &rsp)
        fmt.Printf("Rsp : %d, %v\n", rsp.Status, rsp.Data)

        //rsp
        buf, e := json.Marshal(&rsp)
        if e != nil {
            w.WriteHeader(500)
        }
        w.Write([]byte(buf))
    }
}

//服务
func ProcessEcho(query map[string][]string, body []byte, rsp *Rsp) {
    //解析url参数
    var isEcho bool
    echo := query["echo"]
    if echo != nil {
        //整型值使用strconv转换
        //state, e := strconv.ParseInt(echo[0], 10, 32)
        if echo[0] == "true" {
            isEcho = true
        } else {
            isEcho = false
        }
    }

    //解析post数据
    var req Req
    if e := json.Unmarshal(body, &req); e != nil {
        fmt.Printf("unmarshal fail %v [%v]\n", e, string(body))
        rsp.Status = INVALID_BODY
        rsp.Msg = "Invalid Req Body"
        return
    }

    //其他服务操作

    //回复数据
    if isEcho {
        rsp.Data = req.Msg
    }

    return
}

func main() {
    defer func() {
        if err := recover(); err != nil {
            debug.PrintStack()
        }
    }()

    Router = mux.NewRouter()
    //cgi router
    Router.HandleFunc("/echo_svr", GenHandler(ProcessEcho))
    svr := http.Server{
        Addr:         ":38080",
        ReadTimeout:  3 * time.Second,
        WriteTimeout: 3 * time.Second,
        Handler:      Router,
    }
    svr.ListenAndServe()
}

这个示例足够满足大多数的人的http服务需求，更复杂的需求，参考mux官网使用范例。