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broker.go
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broker.go
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package broker
import (
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"strconv"
)
// IBroker ...
type IBroker interface {
ProcessRequest(*http.Request)
ProcessResponse(*http.Response) error
LogResponse(*http.Response)
LogRequest(*http.Request)
}
// Broker ...
type Broker struct {
}
// DefaultBroker ...
type DefaultBroker struct {
Broker
}
// ProcessRequest of DefaultBroker
func (b DefaultBroker) ProcessRequest(r *http.Request) {
}
// ProcessResponse of DefaultBroker
func (b DefaultBroker) ProcessResponse(r *http.Response) error {
res, err := b.InitResponse(r)
if err != nil {
return err
}
return b.WrapResponse(res, r)
}
// ResStatus ...
type ResStatus struct {
Code int `json:"code"`
Message string `json:"message"`
}
// ResContent ...
type ResContent struct {
Status ResStatus `json:"status"`
Result interface{} `json:"result"`
}
// AcceptJSON 设置请求头 Accept: application/json
func (b *Broker) AcceptJSON(r *http.Request) {
r.Header.Set("Accept", "application/json")
}
// ReadResponse 读取response 内容
func (b *Broker) ReadResponse(c *ResContent, r *http.Response) (err error) {
var reader io.ReadCloser
switch r.Header.Get("Content-Encoding") {
case "gzip":
reader, _ = gzip.NewReader(r.Body)
defer reader.Close()
r.Header.Del("Content-Encoding")
default:
reader = r.Body
}
body, err := ioutil.ReadAll(reader)
if err != nil {
return err
}
err = json.Unmarshal(body, &(c.Result))
if err != nil {
c.Result = string(body)
}
return nil
}
// InitResponse 处理常见标准错误并停供默认提示
func (b *Broker) InitResponse(r *http.Response) (*ResContent, error) {
res := &ResContent{
Status: ResStatus{
Code: 999,
Message: "请求失败(未知错误)",
},
}
err := b.ReadResponse(res, r)
if err != nil {
return res, err
}
switch r.StatusCode {
case 200:
res.Status.Code = 0
res.Status.Message = "请求成功"
case 201:
res.Status.Code = 0
res.Status.Message = "创建成功"
case 204:
res.Status.Code = 0
res.Status.Message = "删除成功"
case 400:
res.Status.Code = 400
res.Status.Message = "请求参数错误"
case 401:
res.Status.Code = 401
res.Status.Message = "无效的身份凭证"
case 403:
res.Status.Code = 403
res.Status.Message = "权限不足"
case 404:
res.Status.Code = 404
res.Status.Message = "该记录不存在"
case 405:
res.Status.Code = 405
res.Status.Message = "接口使用方式错误"
}
if r.StatusCode >= 500 {
res.Status.Code = 500
res.Status.Message = "接口内部异常"
}
return res, nil
}
// WrapResponse 将ResContent以json返回
func (b *Broker) WrapResponse(c *ResContent, r *http.Response) error {
status := map[string]interface{}{
"code": c.Status.Code,
"message": c.Status.Message,
}
res := map[string]interface{}{
"status": status,
"result": c.Result,
}
content, err := json.Marshal(&res)
if err != nil {
return err
}
r.Body = ioutil.NopCloser(bytes.NewReader(content))
r.Header.Set("Content-Type", "application/json")
r.Header.Set("Content-Length", strconv.Itoa(len(content)))
return nil
}
// LogResponse ...
func (b Broker) LogResponse(r *http.Response) {
// TODO
fmt.Println(r.Body)
}
// LogRequest ...
func (b Broker) LogRequest(r *http.Request) {
// TODO
fmt.Println(r.Body)
}