/
request.go
162 lines (135 loc) · 3.35 KB
/
request.go
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package request
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"time"
"go.uber.org/multierr"
)
type httpRequest struct {
request *http.Request
timeout time.Duration
payload []byte
header map[string]string
retries uint8
logger *log.Logger
}
type byteReaderCloser struct {
io.Reader
}
func (byteReaderCloser) Close() error { return nil }
func New(logger *log.Logger) (*httpRequest, error) {
request, err := http.NewRequest("", "", nil)
if err != nil {
return nil, err
}
return &httpRequest{
request: request,
header: make(map[string]string),
retries: 0,
timeout: 30 * time.Second,
logger: logger,
}, nil
}
func (h *httpRequest) SetContext(ctx context.Context) *httpRequest {
h.request = h.request.WithContext(ctx)
return h
}
func (h *httpRequest) SetMethod(method string) *httpRequest {
if method != "GET" &&
method != "POST" &&
method != "PUT" &&
method != "DELETE" {
if h.logger != nil {
h.logger.Printf("[ERROR] Invalid/Unsupported http method: %s", method)
}
return nil
}
h.request.Method = method
return h
}
func (h *httpRequest) SetURI(uri string) *httpRequest {
u, err := url.Parse(uri)
if err != nil {
h.logger.Printf("[ERROR] Invalid URL %s", uri)
return nil
}
h.request.URL = u
return h
}
func (h *httpRequest) SetPayloadFromReader(reader io.ReadCloser) *httpRequest {
h.request.Body = reader
return h
}
func (h *httpRequest) SetPayload(payload []byte) *httpRequest {
h.request.Body = byteReaderCloser{bytes.NewBuffer(payload)}
h.payload = payload
return h
}
func (h *httpRequest) SetHeader(key, value string) *httpRequest {
h.request.Header.Set(key, value)
h.header[key] = value
return h
}
func (h *httpRequest) SetCookie(requestCookie *http.Cookie) *httpRequest {
h.request.AddCookie(requestCookie)
h.header["Cookie"] = requestCookie.String()
return h
}
func (h *httpRequest) SetTimeout(timeout time.Duration) *httpRequest {
h.timeout = timeout * time.Second
return h
}
func (h *httpRequest) SetRetries(retries uint8) *httpRequest {
h.retries = retries + 1
return h
}
func (h *httpRequest) Do() (*http.Response, error) {
if h.request.URL.String() == "" {
return nil, fmt.Errorf("Request URI must be specified")
}
client := &http.Client{Timeout: h.timeout}
if (h.payload == nil || len(h.payload) == 0) && h.request.Body != nil {
requestPayload, err := ioutil.ReadAll(h.request.Body)
requestBodyReader := bytes.NewReader(requestPayload)
h.request.Body = byteReaderCloser{requestBodyReader}
if err != nil {
return nil, err
}
h.payload = requestPayload
}
response, err := client.Do(h.request)
if h.retries == 0 {
return response, err
}
var retries uint8 = 1
log.Println("[INFO]: Starting retries...")
for retries <= h.retries {
response, err = client.Do(h.request)
if err != nil {
if urlError, ok := err.(*url.Error); ok {
if urlError.Timeout() {
log.Println("[ERROR]: Request timed out")
}
} else {
err = multierr.Append(err, fmt.Errorf("Call failed at retry number %d", retries))
log.Println("[ERROR]:", err)
}
retries++
continue
}
responsePayload, err := ioutil.ReadAll(response.Body)
if err != nil {
return nil, err
}
responseBodyReader := bytes.NewReader(responsePayload)
response.Body = byteReaderCloser{responseBodyReader}
return response, nil
}
return nil, fmt.Errorf("Request failed")
}