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http.go
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http.go
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// Copyright 2013 The StudyGolang Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// http://studygolang.com
// Author: polaris polaris@studygolang.com
package util
import (
"bytes"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"net/url"
"time"
echo "github.com/labstack/echo/v4"
)
// FetchRealUrl 获取链接真实的URL(获取重定向一次的结果URL)
func FetchRealUrl(uri string) (realUrl string) {
client := &http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
realUrl = req.URL.String()
return errors.New("util fetch real url")
},
}
resp, err := client.Get(uri)
if err != nil {
return
}
defer resp.Body.Close()
return uri
}
const XRequestedWith = "X-Requested-With"
func IsAjax(ctx echo.Context) bool {
if ctx.Request().Header.Get(XRequestedWith) == "XMLHttpRequest" {
return true
}
return false
}
func DoGet(url string, extras ...int) (body []byte, err error) {
// 默认重试次数
num := 3
// 是否 sleep
sleep := false
switch len(extras) {
case 0:
case 1:
num = extras[0]
case 2:
num = extras[0]
sleep = true
default:
}
for i := 0; i < num; i++ {
body, err = doGet(url)
if err == nil {
break
}
if sleep {
time.Sleep(time.Second * time.Duration(2*i+1))
}
}
return
}
func doGet(url string) ([]byte, error) {
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, errors.New("StatusCode is not 200")
}
return ioutil.ReadAll(resp.Body)
}
func DoPost(url string, data url.Values, extras ...int) (body []byte, err error) {
// 默认重试次数
num := 3
// 是否sleep
sleep := false
switch len(extras) {
case 0:
case 1:
num = extras[0]
case 2:
num = extras[0]
sleep = true
default:
}
for i := 0; i < num; i++ {
body, err = doPost(url, data)
if err == nil {
break
}
if sleep {
time.Sleep(time.Second * time.Duration(2*i+1))
}
}
return
}
func doPost(url string, data url.Values) ([]byte, error) {
httpClient := &http.Client{
Timeout: 10 * time.Second,
}
resp, err := httpClient.PostForm(url, data)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, errors.New("StatusCode is not 200")
}
return ioutil.ReadAll(resp.Body)
}
func DoPostRaw(url string, bodyType string, data interface{}, extras ...int) (body []byte, err error) {
// 默认重试次数
num := 3
// 是否sleep
sleep := false
switch len(extras) {
case 0:
case 1:
num = extras[0]
case 2:
num = extras[0]
sleep = true
default:
}
for i := 0; i < num; i++ {
body, err = doPostRaw(url, bodyType, data)
if err == nil {
break
}
if sleep {
time.Sleep(time.Second * time.Duration(2*i+1))
}
}
return
}
func doPostRaw(url, bodyType string, data interface{}) ([]byte, error) {
httpClient := &http.Client{
Timeout: 10 * time.Second,
}
bodyByte, err := json.Marshal(data)
if nil == err {
resp, err := httpClient.Post(url, bodyType, bytes.NewReader(bodyByte))
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, errors.New("StatusCode is not 200")
}
return ioutil.ReadAll(resp.Body)
}
return nil, err
}