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httpclient.go
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httpclient.go
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/*
Copyright 2020. Huawei Technologies Co., Ltd. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package httpclient
import (
"bytes"
"context"
"crypto/tls"
"io"
"io/ioutil"
"net/http"
"time"
)
type PushRequest struct {
Method string
URL string
Body []byte
Header []HTTPOption
}
type PushResponse struct {
Status int
Header http.Header
Body []byte
}
type HTTPRetryConfig struct {
MaxRetryTimes int
RetryInterval time.Duration
}
type HTTPClient struct {
Client *http.Client
RetryConfig *HTTPRetryConfig
}
type HTTPOption func(r *http.Request)
func SetHeader(key string, value string) HTTPOption {
return func(r *http.Request) {
r.Header.Set(key, value)
}
}
func NewHTTPClient() (*HTTPClient, error) {
tr := &http.Transport{
MaxIdleConns: 10,
IdleConnTimeout: 30 * time.Second,
DisableCompression: true,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: tr}
return &HTTPClient{
Client: client,
RetryConfig: &HTTPRetryConfig{
MaxRetryTimes: 4,
RetryInterval: 0},
}, nil
}
func (r *PushRequest) buildHTTPRequest() (*http.Request, error) {
var body io.Reader
if r.Body != nil {
body = bytes.NewBuffer(r.Body)
}
req, err := http.NewRequest(r.Method, r.URL, body)
if err != nil {
return nil, err
}
for _, opt := range r.Header {
opt(req)
}
return req, nil
}
func (c *HTTPClient) doHttpRequest(req *PushRequest) (*PushResponse, error) {
request, err := req.buildHTTPRequest()
if err != nil {
return nil, err
}
resp, err := c.Client.Do(request)
if err != nil {
return nil, err
}
body, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return nil, err
}
return &PushResponse{
Status: resp.StatusCode,
Header: resp.Header,
Body: body,
}, nil
}
func (c *HTTPClient) DoHttpRequest(ctx context.Context, req *PushRequest) (*PushResponse, error) {
var (
result *PushResponse
err error
)
for retryTimes := 0; retryTimes < c.RetryConfig.MaxRetryTimes; retryTimes++ {
result, err = c.doHttpRequest(req)
if err == nil {
break
}
if !c.pendingForRetry(ctx) {
break
}
}
return result, err
}
func (c *HTTPClient) pendingForRetry(ctx context.Context) bool {
if c.RetryConfig.RetryInterval > 0 {
select {
case <-ctx.Done():
return false
case <-time.After(c.RetryConfig.RetryInterval):
return true
}
}
return false
}