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http_client.go
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http_client.go
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// Copyright 2017 Istio Authors. 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 env
import (
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"strings"
"time"
"istio.io/fortio/fhttp"
)
// HTTP client time out in second.
const httpTimeOut = 5
// Maximum number of ping the server to wait.
const maxAttempts = 30
// HTTPFastGet only cares about network error.
// Issue fast request, only care about network error.
// Don't care about server response.
func HTTPFastGet(url string) (err error) {
client := &http.Client{}
client.Timeout = httpTimeOut * time.Second
_, err = client.Get(url)
return err
}
// HTTPGet send GET
func HTTPGet(url string) (code int, respBody string, err error) {
log.Println("HTTP GET", url)
client := &http.Client{}
client.Timeout = httpTimeOut * time.Second
resp, err := client.Get(url)
if err != nil {
log.Println(err)
return 0, "", err
}
defer func() {
_ = resp.Body.Close()
}()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println(err)
return 0, "", err
}
respBody = string(body)
code = resp.StatusCode
log.Println(respBody)
return code, respBody, nil
}
// HTTPPost sends POST
func HTTPPost(url string, contentType string, reqBody string) (code int, respBody string, err error) {
log.Println("HTTP POST", url)
client := &http.Client{}
client.Timeout = httpTimeOut * time.Second
resp, err := client.Post(url, contentType, strings.NewReader(reqBody))
if err != nil {
log.Println(err)
return 0, "", err
}
defer func() {
_ = resp.Body.Close()
}()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println(err)
return 0, "", err
}
respBody = string(body)
code = resp.StatusCode
log.Println(fhttp.DebugSummary(body, 512))
return code, respBody, nil
}
// ShortLiveHTTPPost send HTTP without keepalive
func ShortLiveHTTPPost(url string, contentType string, reqBody string) (code int, respBody string, err error) {
log.Println("Short live HTTP POST", url)
tr := &http.Transport{
DisableKeepAlives: true,
}
client := &http.Client{Transport: tr}
resp, err := client.Post(url, contentType, strings.NewReader(reqBody))
if err != nil {
log.Println(err)
return 0, "", err
}
defer func() {
_ = resp.Body.Close()
}()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println(err)
return 0, "", err
}
respBody = string(body)
code = resp.StatusCode
log.Println(respBody)
return code, respBody, nil
}
// HTTPGetWithHeaders send HTTP with headers
func HTTPGetWithHeaders(l string, headers map[string]string) (code int, respBody string, err error) {
log.Println("HTTP GET with headers: ", l)
client := &http.Client{}
client.Timeout = httpTimeOut * time.Second
req := http.Request{}
req.Header = map[string][]string{}
for k, v := range headers {
req.Header[k] = []string{v}
}
req.Method = http.MethodGet
req.URL, err = url.Parse(l)
if err != nil {
log.Println(err)
return 0, "", err
}
resp, err := client.Do(&req)
if err != nil {
log.Println(err)
return 0, "", err
}
defer func() {
_ = resp.Body.Close()
}()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println(err)
return 0, "", err
}
respBody = string(body)
code = resp.StatusCode
log.Println(respBody)
return code, respBody, nil
}
// WaitForHTTPServer waits for a HTTP server
func WaitForHTTPServer(url string) {
for i := 0; i < maxAttempts; i++ {
log.Println("Pinging URL: ", url)
code, _, err := HTTPGet(url)
if err == nil && code == http.StatusOK {
log.Println("Server is up and running...")
return
}
log.Println("Will wait a second and try again.")
time.Sleep(200 * time.Millisecond)
}
log.Println("Give up the wait, continue the test...")
}
// WaitForPort waits for a TCP port
func WaitForPort(port uint16) {
serverPort := fmt.Sprintf("localhost:%v", port)
for i := 0; i < maxAttempts; i++ {
log.Println("Pinging port: ", serverPort)
_, err := net.Dial("tcp", serverPort)
if err == nil {
log.Println("The port is up and running...")
return
}
log.Println("Wait a second and try again.")
time.Sleep(200 * time.Millisecond)
}
log.Println("Give up the wait, continue the test...")
}
// IsPortUsed checks if a port is used
func IsPortUsed(port uint16) bool {
serverPort := fmt.Sprintf("localhost:%v", port)
_, err := net.Dial("tcp", serverPort)
return err == nil
}