golang restful logcontainer

golang-restful-logcontainer

```go
package api

import (
        "fmt"
        "hash/fnv"
        "net/http"
        "net/http/httptest"
        "net/http/httputil"

        "github.com/emicklei/go-restful"
        "github.com/satori/go.uuid"
)

type LogContainer struct {
        container *restful.Container
}

func NewLogContainer(c *restful.Container) *LogContainer {
        return &LogContainer{container: c}
}

func (l *LogContainer) ServeHTTP(httpwriter http.ResponseWriter, httpRequest *http.Request) {
        rid := requestID()
        log.Infof("[log-container](%s) method:%v, url:%v", rid, httpRequest.Method, httpRequest.URL)
        dump, _ := httputil.DumpRequest(httpRequest, true)
        log.Infof("[log-container](%s) request dump: %v", rid, string(dump))

        rec := httptest.NewRecorder()
        l.container.ServeHTTP(rec, httpRequest)
        log.Infof("[log-container](%s) response dump: code:%d, body: %v", rid, rec.Code, rec.Body.String())

        // copy from w to httpwriter
        // NOTE: we need to write header first
        for k, v := range rec.Header() {
                httpwriter.Header()[k] = v
        }
        httpwriter.WriteHeader(rec.Code)
        httpwriter.Write(rec.Body.Bytes())
}

func requestID() string {
        h := fnv.New32()
        h.Write(uuid.NewV4().Bytes())
        return fmt.Sprintf("%010d", h.Sum32())
}