/
net.go
215 lines (186 loc) · 4.77 KB
/
net.go
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package net
import (
"bytes"
"context"
"encoding/json"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"strings"
)
// Net 请求结构体
type Net struct {
client *http.Client // 可重复使用的client
baseURL *url.URL // 请求根地址
isRelase bool // 是否是生成环境
}
// SuperAgent 请求参数
type SuperAgent struct {
net *Net // 当前请求包实例
url string // 请求地址
method string // 请求方式
contentType string // 请求类型
body interface{} // 发送请求的body
header map[string]string // 头文件
}
const (
contentJSON = "application/json;charset=utf-8"
contentXML = "application/xml;charset=utf-8"
contentText = "text/plain;charset=utf-8"
)
// New 初始化一个请求包对象
func New() *Net {
var release bool
netMode := os.Getenv("NET_MODE")
if len(netMode) == 0 {
release = false
} else if netMode == "release" {
release = true
}
return &Net{
client: http.DefaultClient,
isRelase: release,
}
}
// GetClient 获取http client
func (n *Net) GetClient() *http.Client {
return n.client
}
// NewWithClient 初始化一个请求包对象,自己传入Client
func NewWithClient(client *http.Client) *Net {
return &Net{
client: client,
}
}
// Get 发送 Get 请求
func (n *Net) Get(url string) *SuperAgent {
return &SuperAgent{net: n, url: url, method: "GET"}
}
// Post 发送 Post 请求
func (n *Net) Post(url string) *SuperAgent {
return &SuperAgent{net: n, url: url, method: "POST"}
}
// Put 发送 Put 请求
func (n *Net) Put(url string) *SuperAgent {
return &SuperAgent{net: n, url: url, method: "PUT"}
}
// Delete 发送 Delete 请求
func (n *Net) Delete(url string) *SuperAgent {
return &SuperAgent{net: n, url: url, method: "DELETE"}
}
// JSON 设置请求数据内容,默认用 Content-Type=application/json; 方式发送json数据
func (s *SuperAgent) JSON(body interface{}) *SuperAgent {
s.body = body
s.contentType = contentJSON
return s
}
// XML 设置请求数据内容,默认用 Content-Type=application/json; 方式发送json数据
func (s *SuperAgent) XML(body interface{}) *SuperAgent {
s.body = body
s.contentType = contentXML
return s
}
// Text 设置请求数据内容,默认用 Content-Type=text/plain; 方式发送string数据
func (s *SuperAgent) Text(body string) *SuperAgent {
s.body = body
s.contentType = contentText
return s
}
// Header 设置请求头内容
func (s *SuperAgent) Header(header map[string]string) *SuperAgent {
s.header = header
return s
}
// End 开始http请求
func (s *SuperAgent) End(ctx context.Context, v interface{}) (*http.Response, error) {
if len(s.contentType) > 0 && s.body == nil {
s.body = ""
}
var req *http.Request
var err error
buf := new(bytes.Buffer)
switch s.contentType {
case contentJSON:
err = json.NewEncoder(buf).Encode(s.body)
case contentXML:
err = xml.NewEncoder(buf).Encode(s.body)
case contentText:
_, err = buf.WriteString(s.body.(string))
}
if err != nil {
return nil, err
}
// 转换 url
rel, err := url.Parse(s.url)
if err != nil {
return nil, err
}
u := s.net.baseURL.ResolveReference(rel)
req, err = http.NewRequest(s.method, u.String(), buf)
if err != nil {
return nil, err
}
if len(s.contentType) > 0 {
req.Header.Set("Content-Type", s.contentType)
}
for key, value := range s.header {
req.Header.Set(key, value)
}
if ctx != nil {
req = req.WithContext(ctx)
}
// 执行网络请求
resp, err := s.net.client.Do(req)
if err != nil {
if ctx != nil {
// If we got an error, and the context has been canceled, the context's error is probably more useful.
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
}
// If the error type is *url.Error, sanitize its URL before returning.
if e, ok := err.(*url.Error); ok {
if url, err := url.Parse(e.URL); err == nil {
e.URL = url.String()
return nil, e
}
}
return nil, err
}
defer func() {
// Drain up to 512 bytes and close the body to let the Transport reuse the connection
io.CopyN(ioutil.Discard, resp.Body, 512)
resp.Body.Close()
}()
if w, ok := v.(io.Writer); ok {
io.Copy(w, resp.Body)
} else {
var body []byte
body, err = ioutil.ReadAll(resp.Body)
if !s.net.isRelase {
log.Printf("url: %s , response body: %s", s.url, string(body))
}
if v != nil {
// 默认认为 contentType 不为xml的情况下,所有返回都用json解析
if strings.EqualFold(s.contentType, contentXML) {
err = xml.Unmarshal(body, v)
} else {
err = json.Unmarshal(body, v)
}
}
if err == io.EOF {
err = nil // ignore EOF errors caused by empty response body
}
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf(string(body))
}
}
return resp, err
}