gitee.com/ks-custle/core-gm@v0.0.0-20230922171213-b83bdd97b62c/go-control-plane/internal/upstream/main.go (about)

     1  // Copyright 2020 Envoyproxy Authors
     2  //
     3  //   Licensed under the Apache License, Version 2.0 (the "License");
     4  //   you may not use this file except in compliance with the License.
     5  //   You may obtain a copy of the License at
     6  //
     7  //       http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //   Unless required by applicable law or agreed to in writing, software
    10  //   distributed under the License is distributed on an "AS IS" BASIS,
    11  //   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //   See the License for the specific language governing permissions and
    13  //   limitations under the License.
    14  package main
    15  
    16  import (
    17  	"flag"
    18  	"fmt"
    19  	"log"
    20  	"net/http"
    21  )
    22  
    23  func main() {
    24  	var (
    25  		upstreamPort uint
    26  		hello        string
    27  	)
    28  
    29  	flag.UintVar(&upstreamPort, "upstream", 18080, "Upstream HTTP/1.1 port")
    30  	flag.StringVar(&hello, "message", "Default message", "Message to send in response")
    31  	flag.Parse()
    32  
    33  	log.Printf("upstream listening HTTP/1.1 on %d\n", upstreamPort)
    34  	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    35  		if _, err := w.Write([]byte(hello)); err != nil {
    36  			log.Println(err)
    37  		}
    38  	})
    39  	if err := http.ListenAndServe(fmt.Sprintf(":%d", upstreamPort), nil); err != nil {
    40  		log.Println(err)
    41  	}
    42  }