main.go

package main

import (
	"context"
	"google.golang.org/protobuf/encoding/protojson"
	"log"
	"net"
	"net/http"

	"database/sql"
	_ "github.com/lib/pq"
	"github.com/simplebank/api"
	db "github.com/simplebank/db/sqlc"

	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
	"github.com/simplebank/gapi"
	"github.com/simplebank/pb"
	"github.com/simplebank/util"
	"google.golang.org/grpc"
	"google.golang.org/grpc/reflection"
)

func main() {
	config, err := util.LoadConfig(".")
	if err != nil {
		log.Fatalln("cannot load config: ", err)
	}
	conn, err := sql.Open(config.DBDriven, config.DBSource)
	if err != nil {
		log.Fatalln("cannot conneted to database: ", err)
	}
	store := db.NewStore(conn)
	go runHTTPGatewayServer(config, store)
	runGrpcServer(config, store)
}

func runGinServer(config util.Config, store db.Store) {
	server, err := api.NewServer(config, store)
	if err != nil {
		log.Fatalln("cannot create server: ", err)
	}

	err = server.Start(config.HTTPServerAddress)
	if err != nil {
		log.Fatalln("cannot start server: ", err)
	}
}

func runGrpcServer(config util.Config, store db.Store) {
	server, err := gapi.NewServer(config, store)
	if err != nil {
		log.Fatalln("cannot create server: ", err)
	}

	grpcServer := grpc.NewServer()
	pb.RegisterSimpleBankServer(grpcServer, server)
	reflection.Register(grpcServer)

	listener, err := net.Listen("tcp", config.GRPCServerAddress)
	if err != nil {
		log.Fatal("can't create listener")
	}

	log.Println("start gRPC service at ", listener.Addr().String())
	err = grpcServer.Serve(listener)
	if err != nil {
		log.Fatalln("can't start grpc server")
	}
}

func runHTTPGatewayServer(config util.Config, store db.Store) {
	server, err := gapi.NewServer(config, store)
	if err != nil {
		log.Fatalln("cannot create server: ", err)
	}

	jsonOption := runtime.WithMarshalerOption(runtime.MIMEWildcard, &runtime.JSONPb{
		MarshalOptions: protojson.MarshalOptions{
			UseProtoNames: true,
		},
		UnmarshalOptions: protojson.UnmarshalOptions{
			DiscardUnknown: true,
		},
	})
	grpcMux := runtime.NewServeMux(jsonOption)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	err = pb.RegisterSimpleBankHandlerServer(ctx, grpcMux, server)
	if err != nil {
		log.Fatal("failed to reigister handler server: ", err)
	}

	mux := http.NewServeMux()
	mux.Handle("/", grpcMux)

	fs := http.FileServer(http.Dir("./doc/swagger"))
	mux.Handle("/swagger/", http.StripPrefix("/swagger/", fs))

	listener, err := net.Listen("tcp", config.HTTPServerAddress)
	if err != nil {
		log.Fatal("can't create listener: ", err)
	}

	log.Println("start HTTP gateway service at ", listener.Addr().String())
	err = http.Serve(listener, mux)
	if err != nil {
		log.Fatalln("can't start HTTP gateway server: ", err)
	}
}