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http.go
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http.go
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package httpclient
import (
"bytes"
"encoding/json"
"io"
"net/http"
"net/http/cookiejar"
"net/url"
"strconv"
"time"
)
type Header struct {
Key string
Value string
}
type Headers []Header
type Response struct {
Status int
Body string
Redirect string
}
type IHttpClient interface {
RestGET(url string, rqHeaders *Headers, rs any) (err error) // rs by ref (no generic in types)
RestPOST(url string, rqHeaders *Headers, rq any, rs any) (err error) // rs by ref (no generic in types)
SimpleGET(url string, rqHeaders *Headers) (rs *Response, err error)
SimplePOST(url string, rqHeaders *Headers, formData *url.Values) (rs *Response, err error)
GetCookieJar() (jar http.CookieJar)
ResetCookieJar()
}
type HttpClient struct {
*http.Client
requestLogger func(rq *http.Request, rqBody []byte)
responseLogger func(rq *http.Request, rqBody []byte, rs *http.Response, rsBody []byte, err error, start time.Time)
}
func NewHttpClient() *HttpClient {
client := &HttpClient{
requestLogger: func(rq *http.Request, rqBody []byte) {},
responseLogger: func(rq *http.Request, rqBody []byte, rs *http.Response, rsBody []byte, err error, start time.Time) {},
Client: &http.Client{
Timeout: 10 * time.Second,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
},
}
client.ResetCookieJar()
return client
}
func (httpClient *HttpClient) ResetCookieJar() {
jar, _ := cookiejar.New(nil)
httpClient.Client.Jar = jar
}
func (httpClient *HttpClient) WithTimeout(duration time.Duration) *HttpClient {
httpClient.Timeout = duration
return httpClient
}
func (httpClient *HttpClient) WithRequestLogger(f func(rq *http.Request, rqBody []byte)) *HttpClient {
httpClient.requestLogger = f
return httpClient
}
func (httpClient *HttpClient) WithResponseLogger(f func(rq *http.Request, rqBody []byte, rs *http.Response, rsBody []byte, err error, start time.Time)) *HttpClient {
httpClient.responseLogger = f
return httpClient
}
func (httpClient *HttpClient) RestGET(url string, rqHeaders *Headers, rs any) (err error) {
rsBytes, _, err := httpClient.runHttpRequest("GET", url, rqHeaders, nil)
if err != nil {
return err
}
if rs == nil {
return nil // not expecting rs, don't unmarshal
}
if err = json.Unmarshal(rsBytes, rs); err != nil {
return NewHttpError("error unmarshalling rs: "+string(rsBytes), err)
}
return nil
}
func (httpClient *HttpClient) RestPOST(url string, rqHeaders *Headers, rq any, rs any) (err error) {
rqBytes, err := json.Marshal(rq)
if err != nil {
return NewHttpError("error marshalling rq", err)
}
rsBytes, _, err := httpClient.runHttpRequest("POST", url, rqHeaders, rqBytes)
if err != nil {
return err
}
if rs == nil {
return nil // not expecting rs, don't unmarshal
}
if err = json.Unmarshal(rsBytes, rs); err != nil {
return NewHttpError("error unmarshalling rs: "+string(rsBytes), err)
}
return nil
}
func (httpClient *HttpClient) SimpleGET(url string, rqHeaders *Headers) (rs *Response, err error) {
responseBytes, httpResponse, err := httpClient.runHttpRequest("GET", url, rqHeaders, nil)
if err != nil {
return nil, err
}
return &Response{
Status: httpResponse.StatusCode,
Body: string(responseBytes),
Redirect: httpResponse.Header.Get("Location"),
}, nil
}
func (httpClient *HttpClient) SimplePOST(url string, rqHeaders *Headers, formData *url.Values) (rs *Response, err error) {
responseBytes, httpResponse, err := httpClient.runHttpRequest("POST", url, rqHeaders, []byte(formData.Encode()))
if err != nil {
return nil, err
}
return &Response{
Status: httpResponse.StatusCode,
Body: string(responseBytes),
Redirect: httpResponse.Header.Get("Location"),
}, nil
}
func (httpClient *HttpClient) GetCookieJar() http.CookieJar {
return httpClient.Jar
}
func (httpClient *HttpClient) runHttpRequest(
rqMethod string,
rqURL string,
rqHeaders *Headers,
rqBody []byte,
) (rsBody []byte, rs *http.Response, err error) {
startTime := time.Now()
var rq *http.Request
if rqBody == nil {
rq, err = http.NewRequest(rqMethod, rqURL, nil)
} else {
rq, err = http.NewRequest(rqMethod, rqURL, bytes.NewBuffer(rqBody))
}
if err != nil {
return nil, nil, NewHttpError("error creating http request", err)
}
if rqHeaders != nil {
for _, header := range *rqHeaders {
rq.Header.Set(header.Key, header.Value)
}
}
httpClient.requestLogger(rq, rqBody)
rs, err = httpClient.Client.Do(rq)
if err != nil {
err = NewHttpError("error doing http call", err)
httpClient.responseLogger(rq, rqBody, nil, nil, err, startTime)
return nil, nil, err
}
if rs.StatusCode >= 400 {
err = NewHttpErrorWithStatus("error status code "+strconv.Itoa(rs.StatusCode), rs.Status, rs.StatusCode)
httpClient.responseLogger(rq, rqBody, rs, nil, nil, startTime) // err not propagated
return nil, rs, err
}
rsBody, err = io.ReadAll(rs.Body)
defer nopClose(rs.Body)
if err != nil {
err = NewHttpErrorWithStatus("error reading response body", rs.Status, rs.StatusCode)
httpClient.responseLogger(rq, rqBody, rs, rsBody, err, startTime)
return nil, rs, err
}
httpClient.responseLogger(rq, rqBody, rs, rsBody, nil, startTime)
return rsBody, rs, nil
}
func nopClose(closer io.Closer) {
_ = closer.Close()
}