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httpclient.go
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httpclient.go
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// Copyright 2017 Netflix, 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,
// 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 (
"log"
"net/http"
"io/ioutil"
"bytes"
"strings"
)
type HttpClient struct {
BaseUrl string
Headers map[string]string
PrintLogs bool
}
func NewHttpClient(baseUrl string, headers map[string]string, printLogs bool) *HttpClient {
httpClient := new(HttpClient)
httpClient.BaseUrl = baseUrl
httpClient.Headers = headers
httpClient.PrintLogs = printLogs
return httpClient
}
func (c *HttpClient) logSendRequest(url string, requestType string, body string) {
log.Println("Sending [", requestType, "] request to Server (", url, "):")
log.Println("Body:")
log.Println(body)
}
func (c *HttpClient) logResponse(statusCode string, response string) {
log.Println("Received response from Server (", c.BaseUrl, "):")
log.Println("Status: ", statusCode)
log.Println("Response:")
log.Println(response)
}
func genParamString(paramMap map[string]string) string {
if paramMap == nil || len(paramMap) == 0 {
return ""
}
output := "?"
for key, value := range paramMap {
output += key
output += "="
output += value
output += "&"
}
return output
}
func (c *HttpClient) httpRequest(url string, requestType string, headers map[string]string, body string) (string, error) {
var req *http.Request
var err error
if requestType == "GET" {
req, err = http.NewRequest(requestType, url, nil)
} else {
var bodyStr = []byte(body)
req, err = http.NewRequest(requestType, url, bytes.NewBuffer(bodyStr))
}
if err != nil {
return "", err
}
// Default Headers
for key, value := range c.Headers {
req.Header.Set(key, value)
}
// Custom Headers
for key, value := range headers {
req.Header.Set(key, value)
}
if c.PrintLogs {
c.logSendRequest(url, requestType, body)
}
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
response, err := ioutil.ReadAll(resp.Body)
responseString := string(response)
if err != nil {
log.Println("ERROR reading response for URL: ", url)
return "", err
}
if c.PrintLogs {
c.logResponse(resp.Status, responseString)
}
return responseString, nil
}
func (c *HttpClient) Get(url string, queryParamsMap map[string]string, headers map[string]string) (string, error) {
urlString := url + genParamString(queryParamsMap)
resp, err := c.httpRequest(urlString, "GET", headers, "")
if err != nil {
log.Println("Http GET Error for URL: ", urlString)
return "", err
}
return resp, nil
}
func (c *HttpClient) Put(url string, queryParamsMap map[string]string, headers map[string]string, body string) (string, error) {
urlString := url + genParamString(queryParamsMap)
resp, err := c.httpRequest(urlString, "PUT", headers, body)
if err != nil {
log.Println("Http PUT Error for URL: ", urlString, )
return "", err
}
return resp, nil
}
func (c *HttpClient) Post(url string, queryParamsMap map[string]string, headers map[string]string, body string) (string, error) {
urlString := url + genParamString(queryParamsMap)
resp, err := c.httpRequest(urlString, "POST", headers, body)
if err != nil {
log.Println("Http POST Error for URL: ", urlString)
return "", err
}
return resp, nil
}
func (c *HttpClient) Delete(url string, queryParamsMap map[string]string, headers map[string]string, body string) (string, error) {
urlString := url + genParamString(queryParamsMap)
resp, err := c.httpRequest(urlString, "DELETE", headers, body)
if err != nil {
log.Println("Http DELETE Error for URL: ", urlString)
return "", err
}
return resp, nil
}
func (c *HttpClient) MakeUrl(path string, args ...string) string {
url := c.BaseUrl
r := strings.NewReplacer(args...)
return url + r.Replace(path)
}