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transport.go
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transport.go
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package hms
import (
"bytes"
"context"
"crypto/tls"
"errors"
"io"
"io/ioutil"
"net/http"
"net/url"
"time"
)
const (
// needed for draining body
respReadLimit = int64(4096)
DefaultRetryCount int = 5
DefaultRetryIntervalMs int = 0
)
type HttpRequest struct {
Method string
URL string
Body []byte
Headers map[string]string
context context.Context
}
func NewHTTPRequest() *HttpRequest {
return &HttpRequest{Headers: make(map[string]string), context: context.Background()}
}
func (r *HttpRequest) SetMethod(method string) *HttpRequest {
r.Method = method
return r
}
func (r *HttpRequest) SetURL(url string) *HttpRequest {
r.URL = url
return r
}
func (r *HttpRequest) SetByteBody(body []byte) *HttpRequest {
r.Body = body
return r
}
func (r *HttpRequest) SetStringBody(body string) *HttpRequest {
r.Body = []byte(body)
return r
}
func (r *HttpRequest) SetHeader(header, value string) *HttpRequest {
r.Headers[header] = value
return r
}
func (r *HttpRequest) AddContext(ctx context.Context) *HttpRequest {
r.context = ctx
return r
}
func (r *HttpRequest) Build() (req *http.Request, err error) {
if !(r.Method == http.MethodGet || r.Method == http.MethodPost) {
return nil, errors.New("not found method")
}
var body io.Reader
if r.Body != nil {
body = bytes.NewBuffer(r.Body)
}
reqContext := context.Background()
if r.context != nil {
reqContext = r.context
}
req, err = http.NewRequestWithContext(reqContext, r.Method, r.URL, body)
if err != nil {
return nil, err
}
for header, value := range r.Headers {
req.Header.Set(header, value)
}
return req, nil
}
type HttpResponse struct {
Status int
Header http.Header
Body io.ReadCloser
}
type HttpTransport struct {
client *http.Client
maxRetryTimes int
retryInterval time.Duration
}
func NewHTTPTransport(retryCount int, retryIntervalMs int) (*HttpTransport, error) {
tr := &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
}
client := &http.Client{Transport: tr}
return &HttpTransport{
client: client,
maxRetryTimes: retryCount,
retryInterval: time.Duration(retryIntervalMs) * time.Millisecond,
}, nil
}
func NewHTTPTransportWithProxy(retryCount int, retryIntervalMs int, proxyUrl string) (*HttpTransport, error) {
proxy, err := url.Parse(proxyUrl)
if err != nil {
return nil, errors.New("fail parse proxy url")
}
tr := &http.Transport{
Proxy: http.ProxyURL(proxy),
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
}
client := &http.Client{Transport: tr}
return &HttpTransport{
client: client,
maxRetryTimes: retryCount,
retryInterval: time.Duration(retryIntervalMs) * time.Millisecond,
}, nil
}
func (tr *HttpTransport) send(req *http.Request) (*HttpResponse, error) {
resp, err := tr.client.Do(req)
if err != nil {
return nil, err
}
return &HttpResponse{
Status: resp.StatusCode,
Header: resp.Header,
Body: resp.Body,
}, nil
}
func (tr *HttpTransport) Send(ctx context.Context, request *HttpRequest) (result *HttpResponse, err error) {
if ctx == nil {
return nil, errors.New("provided nil context")
}
req, err := request.AddContext(ctx).Build()
if err != nil {
return nil, err
}
for retryTimes := 0; retryTimes < tr.maxRetryTimes; retryTimes++ {
result, err = tr.send(req)
if err == nil {
// check response code and on 500 range errors from server
if !tr.isRetryStatusCode(result.Status) {
break
}
// clear result body so we can reuse existing connection for next retry
if err = tr.drainBody(result.Body); err != nil {
break
}
}
// check status of context. if context done - stop executing and return result
if tr.isContextDone(ctx) {
break
}
// wait some time to allow server to recover
time.Sleep(tr.retryInterval)
}
return result, err
}
func (tr *HttpTransport) drainBody(body io.ReadCloser) error {
defer body.Close()
_, err := io.Copy(ioutil.Discard, io.LimitReader(body, respReadLimit))
return err
}
func (tr *HttpTransport) isRetryStatusCode(status int) bool {
return status == 0 || status >= 500
}
func (tr *HttpTransport) isContextDone(ctx context.Context) bool {
select {
case <-ctx.Done():
return true
default:
return false
}
}