github.com/polarismesh/polaris@v1.17.8/test/outlier/frontend/main.go (about)

     1  /**
     2   * Tencent is pleased to support the open source community by making Polaris available.
     3   *
     4   * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
     5   *
     6   * Licensed under the BSD 3-Clause License (the "License");
     7   * you may not use this file except in compliance with the License.
     8   * You may obtain a copy of the License at
     9   *
    10   * https://opensource.org/licenses/BSD-3-Clause
    11   *
    12   * Unless required by applicable law or agreed to in writing, software distributed
    13   * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
    14   * CONDITIONS OF ANY KIND, either express or implied. See the License for the
    15   * specific language governing permissions and limitations under the License.
    16   */
    17  
    18  package main
    19  
    20  import (
    21  	"fmt"
    22  	"io/ioutil"
    23  	"net/http"
    24  	"time"
    25  )
    26  
    27  func main() {
    28  	interval := 500
    29  	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    30  		data, err := request("http://outlier-backend:8090")
    31  		if err != nil {
    32  			fmt.Fprintf(w, "backend fail: %v", err)
    33  			return
    34  		}
    35  		values := r.URL.Query()
    36  		val := values.Get("interval")
    37  		fmt.Sscanf(val, "%v", &interval)
    38  		if interval == 0 {
    39  			interval = 500
    40  		}
    41  		w.Write(data)
    42  	})
    43  	go func() {
    44  		for {
    45  			data, err := request("http://outlier-backend:8090")
    46  			if err != nil {
    47  				fmt.Printf("backend fail: %v\n", err)
    48  			} else {
    49  				fmt.Printf("%v response: %v\n",
    50  					time.Now().Format("2006-01-02 15:04:05"),
    51  					string(data))
    52  			}
    53  			time.Sleep(time.Duration(interval) * time.Millisecond)
    54  		}
    55  	}()
    56  
    57  	http.ListenAndServe(":8080", nil)
    58  }
    59  
    60  func request(url string) ([]byte, error) {
    61  	resp, err := http.Get(url)
    62  	if err != nil {
    63  		fmt.Printf("Error making the request: %s\n", err.Error())
    64  		return nil, err
    65  	}
    66  	defer resp.Body.Close()
    67  
    68  	body, err := ioutil.ReadAll(resp.Body)
    69  	if err != nil {
    70  		fmt.Printf("Error reading the response body: %s\n", err.Error())
    71  		return nil, err
    72  	}
    73  	return body, nil
    74  }