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http_client.go
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http_client.go
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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"crypto/tls"
"fmt"
"io"
"io/ioutil"
"net/http"
"time"
)
// HTTPClient is a wrap of http.Client
type HTTPClient struct {
client *http.Client
}
// NewHTTPClient returns a new HTTP client with timeout and HTTPS support
func NewHTTPClient(timeout time.Duration, tlsConfig *tls.Config) *HTTPClient {
if timeout < time.Second {
timeout = 10 * time.Second // default timeout is 10s
}
return &HTTPClient{
client: &http.Client{
Timeout: timeout,
Transport: &http.Transport{
TLSClientConfig: tlsConfig,
},
},
}
}
// Get fetch an URL with GET method and returns the response
func (c *HTTPClient) Get(url string) ([]byte, error) {
res, err := c.client.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
return checkHTTPResponse(res)
}
// Post send a POST request to the url and returns the response
func (c *HTTPClient) Post(url string, body io.Reader) ([]byte, error) {
res, err := c.client.Post(url, "application/json", body)
if err != nil {
return nil, err
}
defer res.Body.Close()
return checkHTTPResponse(res)
}
// Delete send a DELETE request to the url and returns the response and status code.
func (c *HTTPClient) Delete(url string, body io.Reader) ([]byte, int, error) {
var statusCode int
req, err := http.NewRequest("DELETE", url, body)
if err != nil {
return nil, statusCode, err
}
res, err := c.client.Do(req)
if err != nil {
return nil, statusCode, err
}
defer res.Body.Close()
b, err := checkHTTPResponse(res)
statusCode = res.StatusCode
return b, statusCode, err
}
// checkHTTPResponse checks if an HTTP response is with normal status codes
func checkHTTPResponse(res *http.Response) ([]byte, error) {
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
if res.StatusCode < 200 || res.StatusCode >= 400 {
return body, fmt.Errorf("error requesting %s, response: %s, code %d",
res.Request.URL, string(body[:]), res.StatusCode)
}
return body, nil
}