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request.go
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request.go
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package request
import (
"bytes"
"errors"
"io/ioutil"
"net/http"
"time"
)
// Header is custom header
type Header map[string]string
// Query for querystring
type Query map[string]string
// ToQuery convert from other type to paramQuery type
func ToQuery(params interface{}) Query {
var paramQuery = Query{}
for k, v := range params.(map[string]string) {
paramQuery[k] = v
}
return paramQuery
}
// GET is request
func (c *Config) Get() *Response {
var res *Response
if err := c.setMethod(http.MethodGet); err != nil {
return res.setError(err)
}
request, err := c.newRequest()
if err != nil {
return res.setError(err)
}
if c.Headers != nil {
request = buildHeader(request, c.Headers)
}
request = buildQuery(request, c.QueryString)
return c.send(request)
}
// POST is request
func (c *Config) Post() *Response {
var res *Response
if err := c.setMethod(http.MethodPost); err != nil {
return res.setError(err)
}
request, err := c.newRequest()
if err != nil {
return res.setError(err)
}
if c.Headers != nil {
request = buildHeader(request, c.Headers)
}
return c.send(request)
}
// DELETE is request
func (c *Config) Delete() *Response {
var res *Response
if err := c.setMethod(http.MethodDelete); err != nil {
return res.setError(err)
}
request, err := c.newRequest()
if err != nil {
return res.setError(err)
}
if c.Headers != nil {
request = buildHeader(request, c.Headers)
}
return c.send(request)
}
// PATCH is request
func (c *Config) Patch() *Response {
var res *Response
if err := c.setMethod(http.MethodPatch); err != nil {
return res.setError(err)
}
request, err := c.newRequest()
if err != nil {
return res.setError(err)
}
if c.Headers != nil {
request = buildHeader(request, c.Headers)
}
return c.send(request)
}
// Put is request
func (c *Config) Put() *Response {
var res *Response
if err := c.setMethod(http.MethodPut); err != nil {
return res.setError(err)
}
request, err := c.newRequest()
if err != nil {
return res.setError(err)
}
if c.Headers != nil {
request = buildHeader(request, c.Headers)
}
return c.send(request)
}
func (c *Config) send(r *http.Request) *Response {
var res *Response
for {
r.Header.Set(string(ContentTypeHeader), c.ContentType)
// set user agent
if c.UserAgent != "" {
r.Header.Set(string(UserAgentHeader), c.UserAgent)
}
// check authorization
if c.Authorization != "" {
r.Header.Add(string(AuthorizationHeader), c.Authorization)
}
resp, err := c.httpClient.Do(r)
// case retry
if c.onRetry() {
// if success
if err == nil {
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return res.setError(err).setErrorDesc(ErrReadData.Error())
}
// Restore the io.ReadCloser to its original state
resp.Body = ioutil.NopCloser(bytes.NewBuffer(data))
return &Response{Detail: resp, Body: data}
}
// if error
select {
case <-r.Context().Done():
return res.setError(err).setErrorDesc(ErrContextDone.Error())
case <-time.After(c.Delay):
c.Retry--
}
continue
}
if err != nil {
return res.setError(err).setErrorDesc(ErrServer.Error())
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return res.setError(err).setErrorDesc(ErrReadData.Error())
}
if resp.StatusCode > 300 {
err := errors.New(http.StatusText(resp.StatusCode))
return res.setError(err)
}
// Restore the io.ReadCloser to its original state
resp.Body = ioutil.NopCloser(bytes.NewBuffer(data))
return &Response{Detail: resp, Body: data}
}
}
// HTTPClient is interface
type HTTPClient interface {
Do(req *http.Request) (resp *http.Response, err error)
}