github.com/lastbackend/toolkit@v0.0.0-20241020043710-cafa37b95aad/examples/wss/main.go (about)

     1  /*
     2  Copyright [2014] - [2023] The Last.Backend authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"io"
    23  	"net/http"
    24  	"os"
    25  
    26  	servicepb "github.com/lastbackend/toolkit/examples/wss/gen/server"
    27  	"github.com/lastbackend/toolkit/examples/wss/middleware"
    28  	"github.com/lastbackend/toolkit/pkg/runtime"
    29  	tk_http "github.com/lastbackend/toolkit/pkg/server/http"
    30  	"github.com/lastbackend/toolkit/pkg/server/http/websockets"
    31  )
    32  
    33  func HealthCheckHandler(w http.ResponseWriter, r *http.Request) {
    34  	w.Header().Set("Content-Type", "application/json")
    35  	w.WriteHeader(http.StatusOK)
    36  	if _, err := io.WriteString(w, `{"alive": true}`); err != nil {
    37  		fmt.Println(err)
    38  	}
    39  }
    40  
    41  func TestWSHandler(ctx context.Context, event websockets.Event, c *websockets.Client) error {
    42  	fmt.Println("Event:", event.Type, string(event.Payload))
    43  	fmt.Println("Context:", ctx.Value("test-data"))
    44  	return c.WriteMessage(websockets.TextMessage, event.Payload)
    45  }
    46  
    47  func main() {
    48  
    49  	// define service with name and options
    50  	app, err := servicepb.NewRouterService("wss",
    51  		runtime.WithVersion("0.1.0"),
    52  		runtime.WithDescription("Example router microservice"),
    53  		runtime.WithEnvPrefix("WSS"),
    54  	)
    55  	if err != nil {
    56  		fmt.Println(err)
    57  	}
    58  
    59  	// Logger settings
    60  	app.Log().Info("Run microservice")
    61  
    62  	// Add middleware
    63  	app.Server().HTTP().SetMiddleware(middleware.RegisterExampleMiddleware)
    64  	app.Server().HTTP().SetMiddleware(middleware.RegisterRequestID)
    65  
    66  	// set middleware as global middleware
    67  	app.Server().HTTP().UseMiddleware("request_id")
    68  	app.Server().HTTP().Subscribe("event:name", TestWSHandler)
    69  
    70  	// add handler to default http server
    71  	app.Server().HTTP().
    72  		AddHandler(http.MethodGet, "/health", HealthCheckHandler, tk_http.WithMiddleware("example"))
    73  
    74  	// Service run
    75  	if err := app.Start(context.Background()); err != nil {
    76  		app.Log().Errorf("could not run the service %v", err)
    77  		os.Exit(1)
    78  		return
    79  	}
    80  
    81  	app.Log().Info("graceful stop")
    82  }