github.com/lastbackend/toolkit@v0.0.0-20241020043710-cafa37b95aad/examples/gateway/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  	"github.com/lastbackend/toolkit"
    27  	servicepb "github.com/lastbackend/toolkit/examples/gateway/gen/server"
    28  	typespb "github.com/lastbackend/toolkit/examples/helloworld/gen"
    29  	"github.com/lastbackend/toolkit/pkg/runtime"
    30  )
    31  
    32  func HealthCheckHandler(w http.ResponseWriter, r *http.Request) {
    33  	w.Header().Set("Content-Type", "application/json")
    34  	w.WriteHeader(http.StatusOK)
    35  	if _, err := io.WriteString(w, `{"alive": true}`); err != nil {
    36  		fmt.Println(err)
    37  	}
    38  }
    39  func main() {
    40  	// define service with name and options
    41  	app, err := servicepb.NewProxyGatewayService("gateway",
    42  		runtime.WithVersion("0.1.0"),
    43  		runtime.WithDescription("Example gateway microservice"),
    44  		runtime.WithEnvPrefix("GTW"),
    45  	)
    46  	if err != nil {
    47  		fmt.Println(err)
    48  	}
    49  
    50  	// Add server
    51  	app.Server().HTTP().AddHandler(http.MethodGet, "/health", HealthCheckHandler)
    52  
    53  	app.Server().GRPC().SetService(newServer)
    54  
    55  	// Logger settings
    56  	app.Log().Info("Run microservice")
    57  
    58  	// Service run
    59  	if err := app.Start(context.Background()); err != nil {
    60  		app.Log().Errorf("could not run the service %v", err)
    61  		os.Exit(1)
    62  		return
    63  	}
    64  
    65  	app.Log().Info("graceful stop")
    66  }
    67  
    68  type Handlers struct {
    69  	app toolkit.Service
    70  }
    71  
    72  // Implement server
    73  func newServer(app toolkit.Service) servicepb.ProxyGatewayRpcServer {
    74  	return &Handlers{
    75  		app: app,
    76  	}
    77  }
    78  
    79  func (h *Handlers) HelloWorld(ctx context.Context, req *typespb.HelloRequest) (*typespb.HelloReply, error) {
    80  	return &typespb.HelloReply{
    81  		Message: "hello",
    82  	}, nil
    83  }