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client.go
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client.go
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package http
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"net"
nethttp "net/http"
neturl "net/url"
"reflect"
"strings"
"time"
"unicode"
"github.com/json-iterator/go"
"github.com/valyala/fasthttp"
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
const (
formTagName = "form"
)
// client type
const (
ClientNetHTTP = iota + 1
ClientFastHTTP
)
// DefaultClient is the client to handle the various HTTP request, with net/http.Client as internal client
type DefaultClient struct {
// May add more functions here in the future
internal *nethttp.Client
}
// FastHTTPClient is the client to handle the various HTTP request, with net/fasthttp.Client as internal client
type FastHTTPClient struct {
internal *fasthttp.Client
}
// Options are options to create a client
type Options struct {
Timeout time.Duration
ClientType int
}
// Option is modifier to update Options
type Option func(*Options)
// Timeout sets `Options.Timeout`
func Timeout(timeout time.Duration) Option {
return func(options *Options) {
options.Timeout = timeout
}
}
// RawClientType sets `Options.ClientType`
func RawClientType(clientType int) Option {
return func(options *Options) {
if clientType < ClientNetHTTP || clientType > ClientFastHTTP {
return
}
options.ClientType = clientType
}
}
// NewDefaultClient initializes a new DefaultClient
func NewDefaultClient() Client {
return GetClient()
}
// GetClient creates a `Client` based on `opts` and returns to caller
func GetClient(opts ...Option) Client {
options := &Options{
Timeout: 10 * time.Second,
ClientType: ClientNetHTTP,
}
for _, f := range opts {
f(options)
}
if options.ClientType == ClientNetHTTP {
return &DefaultClient{
internal: &nethttp.Client{
Transport: transport,
Timeout: options.Timeout,
},
}
} else if options.ClientType == ClientFastHTTP {
return &FastHTTPClient{
internal: &fasthttp.Client{
ReadTimeout: options.Timeout,
WriteTimeout: options.Timeout,
MaxConnsPerHost: 100,
Dial: func(addr string) (conn net.Conn, e error) {
return transport.DialContext(context.Background(), "tcp", addr)
},
},
}
}
return nil
}
func isPublicField(fieldType reflect.StructField) bool {
return unicode.IsUpper(rune(fieldType.Name[0]))
}
func setFormValue(form *neturl.Values, key string, value interface{}) {
obj := reflect.ValueOf(value)
switch obj.Kind() {
case reflect.Ptr:
form.Set(key, fmt.Sprintf("%v", obj.Elem()))
case reflect.Slice, reflect.Array:
for i := 0; i < obj.Len(); i++ {
item := obj.Index(i)
if item.Kind() == reflect.Ptr {
form.Add(key, fmt.Sprintf("%v", item.Elem()))
} else {
form.Add(key, fmt.Sprintf("%v", item))
}
}
default:
form.Set(key, fmt.Sprintf("%v", value))
}
}
type headerSetter interface {
Add(key string, value string)
}
func setHeader(headerSetter headerSetter, value interface{}, key string) (err error) {
obj := reflect.ValueOf(value)
switch obj.Kind() {
case reflect.Ptr:
if obj.Elem().Kind() != reflect.Struct {
return setHeader(headerSetter, obj.Elem(), key)
}
s := ""
s, err = json.MarshalToString(value)
if err != nil {
return
}
headerSetter.Add(key, s)
case reflect.Slice, reflect.Array:
for i := 0; i < obj.Len(); i++ {
err = setHeader(headerSetter, obj.Index(i).Interface(), key)
if err != nil {
return
}
}
case reflect.Struct:
s := ""
s, err = json.MarshalToString(value)
if err != nil {
return
}
headerSetter.Add(key, s)
case reflect.Map:
s := ""
s, err = json.MarshalToString(value)
if err != nil {
return
}
headerSetter.Add(key, s)
default:
headerSetter.Add(key, fmt.Sprintf("%v", value))
}
return
}
func getBodyReaderAndForm(format requestDataFormat, data interface{}) (io.Reader, *neturl.Values, error) {
var reqBody io.Reader
var s string
var ok bool
var err error
var form *neturl.Values
if data != nil {
if format == JSON {
s, err = json.MarshalToString(data)
if err != nil {
return nil, nil, err
}
reqBody = strings.NewReader(s)
} else if format == QueryString || format == Form {
var urlValues neturl.Values
var pDataMap *DataMap
var dataMap DataMap
if data == nil {
// Nil
} else if form, ok = data.(*neturl.Values); ok {
// data is *url.Values
} else if urlValues, ok = data.(neturl.Values); ok {
// data is url.Values
form = &urlValues
} else if pDataMap, ok = data.(*DataMap); ok {
// data is *DataMap
form = &neturl.Values{}
for k, v := range *pDataMap {
setFormValue(form, k, v)
}
} else if dataMap, ok = data.(DataMap); ok {
// data is DataMap
form = &neturl.Values{}
for k, v := range dataMap {
setFormValue(form, k, v)
}
} else {
// data is struct
form = &neturl.Values{}
obj := reflect.ValueOf(data)
if obj.Kind() == reflect.Ptr {
obj = obj.Elem()
}
if obj.Kind() != reflect.Struct {
return nil, nil, fmt.Errorf("unsupport_data_type:%v", obj.Kind())
}
t := obj.Type()
fn := obj.NumField()
var fieldName string
for i := 0; i < fn; i++ {
ft := t.Field(i)
if isPublicField(ft) {
fieldName, ok = ft.Tag.Lookup(formTagName)
if !ok {
fieldName = ft.Name
}
setFormValue(form, fieldName, obj.Field(i).Interface())
}
}
}
if form != nil {
if format == Form {
reqBody = strings.NewReader(form.Encode())
}
}
} else if format == Raw {
if s, ok := data.(string); ok {
reqBody = strings.NewReader(s)
} else if s, ok := data.(*string); ok {
if s != nil {
reqBody = strings.NewReader(*s)
}
} else if b, ok := data.([]byte); ok {
reqBody = bytes.NewBuffer(b)
} else if b, ok := data.(*[]byte); ok {
if b != nil {
reqBody = bytes.NewBuffer(*b)
}
} else {
obj := reflect.ValueOf(data)
return nil, nil, fmt.Errorf("unsupported_data_type_for_Raw:%v", obj.Kind())
}
}
}
return reqBody, form, nil
}
// RequestJSON Send http request to query JSON data
// `data` can be `*url.Values`, `*DataMap`, or struct, for any requestDataFormat
//
// Note:
// 1. if pass `url.Values` or `DataMap` as data, should pass the pointer
// 2. For struct data, can specify the field name by `form` tag. E.g. struct { Name string `form:"name"` }
//
// Examples:
//
// 0. Response struct
//
// ```
// type ApiResponse struct {
// Error string `json:"error"`
// }
// resp := ApiResponse{}
// ```
//
// 1. Pass *url.Values as parameters
//
// ```
// v := url.Values{}
// v.Set("name", "abc")
// v.Add("values", "1")
// v.Add("values", "2")
// http.HTTPRequestJSON(resp, "GET", "http://localhost/api", http.QueryString, &v)
// ```
//
// The request will be:
//
// ```
// GET /api?name=abc&values=1&values=2 HTTP/1.1
// Host: localhost
// ```
//
// 2. Pass DataMap as parameters
//
// ```
// http.HTTPRequestJSON(resp, "POST", "http://localhost/api", http.Form,
// &http.DataMap{
// "name": "abc",
// "values": []int{1, 2},
// })
// ```
//
// The request will be:
//
// ```
// POST /api HTTP/1.1
// Host: localhost
// Content-Type: application/x-www-form-urlencoded
//
// name=abc&values=1&values=2
// ```
//
// 3. Pass Struct as parameters
//
// ```
// type ApiRequest struct {
// Name string `json:"name" form:"name"`
// Values []int `json:"values" form:"values"`
// }
// http.HTTPRequestJSON(resp, "POST", "http://localhost/api", http.JSON,
// &ApiRequest{
// Name: "abc",
// Values: []int{1, 2},
// })
// ```
//
// The request will be:
//
// ```
// POST /api HTTP/1.1
// Host: localhost
// Content-Type: application/json
//
// {"name":"abc","values":[1,2]}
// ```
func (c *DefaultClient) RequestJSON(respData interface{}, method Method, url string, format requestDataFormat, data interface{}, headers ...*DataMap) (err error) {
reqBody, form, err := getBodyReaderAndForm(format, data)
if err != nil {
return err
}
var req *nethttp.Request
req, err = nethttp.NewRequest(string(method), url, reqBody)
if format == QueryString {
if form != nil {
req.URL.RawQuery = form.Encode()
}
} else if format == Form {
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
} else if format == JSON {
req.Header.Set("Content-Type", "application/json")
}
// add custom headers
for _, h := range headers {
for k, v := range *h {
err := setHeader(req.Header, v, k)
if err != nil {
return err
}
}
}
var resp *nethttp.Response
resp, err = c.internal.Do(req)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
return err
}
if resp.StatusCode != nethttp.StatusOK {
return fmt.Errorf("http_error_status_code:%d", resp.StatusCode)
}
if respData == nil {
return nil
}
var body []byte
body, err = ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
err = json.Unmarshal(body, respData)
if err != nil {
return err
}
return nil
}
// RequestJSON Send http request to query JSON data
func (c *FastHTTPClient) RequestJSON(respData interface{}, method Method, url string, format requestDataFormat, data interface{}, headers ...*DataMap) (err error) {
reqBody, form, err := getBodyReaderAndForm(format, data)
if err != nil {
return err
}
req := fasthttp.AcquireRequest()
resp := fasthttp.AcquireResponse()
defer fasthttp.ReleaseRequest(req)
defer fasthttp.ReleaseResponse(resp)
req.Header.SetMethod(string(method))
req.SetRequestURI(url)
if format == QueryString {
if form != nil {
req.SetRequestURI(fmt.Sprintf("%s?%s", url, form.Encode()))
}
}
if string(method) != "GET" && string(method) != "HEAD" {
req.SetBodyStream(reqBody, -1)
}
u, _ := neturl.Parse(url)
req.SetHost(u.Host)
if format == QueryString {
if form != nil {
req.SetRequestURI(fmt.Sprintf("%s?%s", url, form.Encode()))
}
} else if format == Form {
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
} else if format == JSON {
req.Header.Set("Content-Type", "application/json")
}
// add custom headers
for _, h := range headers {
for k, v := range *h {
err := setHeader(&req.Header, v, k)
if err != nil {
return err
}
}
}
err = c.internal.DoTimeout(req, resp, c.internal.ReadTimeout)
if err != nil {
return err
}
if resp.StatusCode() != fasthttp.StatusOK {
return fmt.Errorf("http_error_status_code:%d", resp.StatusCode())
}
body := resp.Body()
err = json.Unmarshal(body, respData)
if err != nil {
return err
}
return nil
}
// GetRawClient gets the internal client
func (c *DefaultClient) GetRawClient() interface{} {
return c.internal
}
// GetRawClient gets the internal client
func (c *FastHTTPClient) GetRawClient() interface{} {
return c.internal
}