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client.go
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client.go
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package http
import (
"bytes"
"encoding/json"
"github.com/pkg/errors"
"howett.net/plist"
"io"
"net/http"
"strings"
)
//go:generate mockgen -source=client.go -destination=client_mock.go -package=http
type Client[R interface{}] interface {
Send(request Request) (Result[R], error)
Do(req *http.Request) (*http.Response, error)
NewRequest(method, url string, body io.Reader) (*http.Request, error)
}
type client[R interface{}] struct {
internalClient http.Client
cookieJar CookieJar
}
type ClientArgs struct {
CookieJar CookieJar
}
type AddHeaderTransport struct {
T http.RoundTripper
}
func (adt *AddHeaderTransport) RoundTrip(req *http.Request) (*http.Response, error) {
if req.Header.Get("User-Agent") == "" {
req.Header.Set("User-Agent", DefaultUserAgent)
}
return adt.T.RoundTrip(req)
}
func NewClient[R interface{}](args ClientArgs) Client[R] {
return &client[R]{
internalClient: http.Client{
Timeout: 0,
Jar: args.CookieJar,
Transport: &AddHeaderTransport{http.DefaultTransport},
},
cookieJar: args.CookieJar,
}
}
func (c *client[R]) Send(req Request) (Result[R], error) {
var data []byte
var err error
if req.Payload != nil {
data, err = req.Payload.data()
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrGetPayloadData.Error())
}
}
request, err := http.NewRequest(req.Method, req.URL, bytes.NewReader(data))
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrCreateRequest.Error())
}
for key, val := range req.Headers {
request.Header.Set(key, val)
}
var res *http.Response
var retries = 3
for {
res, err = c.internalClient.Do(request)
retries = retries - 1
if err != nil {
if retries <= 0 {
return Result[R]{}, errors.Wrap(err, ErrRequest.Error())
}
continue
}
break
}
err = c.cookieJar.Save()
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrSaveCookie.Error())
}
if req.ResponseFormat == ResponseFormatJSON {
return c.handleJSONResponse(res)
}
if req.ResponseFormat == ResponseFormatXML {
return c.handleXMLResponse(res)
}
return Result[R]{}, errors.Errorf("%s: %s", ErrUnsupportedContentType.Error(), req.ResponseFormat)
}
func (c *client[R]) Do(req *http.Request) (*http.Response, error) {
return c.internalClient.Do(req)
}
func (*client[R]) NewRequest(method, url string, body io.Reader) (*http.Request, error) {
return http.NewRequest(method, url, body)
}
func (c *client[R]) handleJSONResponse(res *http.Response) (Result[R], error) {
body, err := io.ReadAll(res.Body)
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrGetResponseBody.Error())
}
var data R
err = json.Unmarshal(body, &data)
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrUnmarshalJSON.Error())
}
return Result[R]{
StatusCode: res.StatusCode,
Data: data,
}, nil
}
func (c *client[R]) handleXMLResponse(res *http.Response) (Result[R], error) {
body, err := io.ReadAll(res.Body)
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrGetResponseBody.Error())
}
var data R
_, err = plist.Unmarshal(body, &data)
if err != nil {
return Result[R]{}, errors.Wrap(err, ErrUnmarshalXML.Error())
}
headers := map[string]string{}
for key, val := range res.Header {
headers[key] = strings.Join(val, "; ")
}
return Result[R]{
StatusCode: res.StatusCode,
Headers: headers,
Data: data,
}, nil
}