open-match.dev/open-match@v1.8.1/examples/demo/demo.go (about)

     1  // Copyright 2019 Google LLC
     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  
    15  // Package demo contains the core startup code for running a demo.
    16  package demo
    17  
    18  import (
    19  	"bytes"
    20  	"context"
    21  	"encoding/json"
    22  	"fmt"
    23  	"log"
    24  	"net/http"
    25  
    26  	"golang.org/x/net/websocket"
    27  	"open-match.dev/open-match/examples/demo/bytesub"
    28  	"open-match.dev/open-match/examples/demo/components"
    29  	"open-match.dev/open-match/examples/demo/updater"
    30  	"open-match.dev/open-match/internal/telemetry"
    31  )
    32  
    33  // Run starts the provided components, and hosts a webserver for observing the
    34  // output of those components.
    35  func Run(comps map[string]func(*components.DemoShared)) {
    36  	log.Print("Initializing Server")
    37  
    38  	fileServe := http.FileServer(http.Dir("/app/static"))
    39  	http.Handle("/static/", http.StripPrefix("/static/", fileServe))
    40  	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    41  		if r.URL.Path != "/" {
    42  			http.NotFound(w, r)
    43  			return
    44  		}
    45  		fileServe.ServeHTTP(w, r)
    46  	})
    47  
    48  	http.Handle(telemetry.HealthCheckEndpoint, telemetry.NewAlwaysReadyHealthCheck())
    49  
    50  	bs := bytesub.New()
    51  	u := updater.New(context.Background(), func(b []byte) {
    52  		var out bytes.Buffer
    53  		err := json.Indent(&out, b, "", "  ")
    54  		if err == nil {
    55  			bs.AnnounceLatest(out.Bytes())
    56  		} else {
    57  			bs.AnnounceLatest(b)
    58  		}
    59  	})
    60  
    61  	http.Handle("/connect", websocket.Handler(func(ws *websocket.Conn) {
    62  		bs.Subscribe(ws.Request().Context(), ws)
    63  	}))
    64  
    65  	log.Print("Starting Server")
    66  
    67  	for name, f := range comps {
    68  		go f(&components.DemoShared{
    69  			Ctx:    context.Background(),
    70  			Update: u.ForField(name),
    71  		})
    72  	}
    73  
    74  	address := fmt.Sprintf(":%d", 51507)
    75  	err := http.ListenAndServe(address, nil)
    76  	log.Printf("HTTP server closed: %s", err.Error())
    77  }