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main.go
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main.go
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package main
import (
"context"
"errors"
"net"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/golang-migrate/migrate/v4"
_ "github.com/golang-migrate/migrate/v4/database/postgres"
_ "github.com/golang-migrate/migrate/v4/source/file"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/hibiken/asynq"
"github.com/jackc/pgx/v5/pgxpool"
"github.com/rakyll/statik/fs"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"github.com/techschool/simplebank/api"
db "github.com/techschool/simplebank/db/sqlc"
_ "github.com/techschool/simplebank/doc/statik"
"github.com/techschool/simplebank/gapi"
"github.com/techschool/simplebank/mail"
"github.com/techschool/simplebank/pb"
"github.com/techschool/simplebank/util"
"github.com/techschool/simplebank/worker"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
"google.golang.org/protobuf/encoding/protojson"
)
var interruptSignals = []os.Signal{
os.Interrupt,
syscall.SIGTERM,
syscall.SIGINT,
}
func main() {
config, err := util.LoadConfig(".")
if err != nil {
log.Fatal().Err(err).Msg("cannot load config")
}
if config.Environment == "development" {
log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
}
ctx, stop := signal.NotifyContext(context.Background(), interruptSignals...)
defer stop()
connPool, err := pgxpool.New(ctx, config.DBSource)
if err != nil {
log.Fatal().Err(err).Msg("cannot connect to db")
}
runDBMigration(config.MigrationURL, config.DBSource)
store := db.NewStore(connPool)
redisOpt := asynq.RedisClientOpt{
Addr: config.RedisAddress,
}
taskDistributor := worker.NewRedisTaskDistributor(redisOpt)
waitGroup, ctx := errgroup.WithContext(ctx)
runTaskProcessor(ctx, waitGroup, config, redisOpt, store)
runGatewayServer(ctx, waitGroup, config, store, taskDistributor)
runGrpcServer(ctx, waitGroup, config, store, taskDistributor)
err = waitGroup.Wait()
if err != nil {
log.Fatal().Err(err).Msg("error from wait group")
}
}
func runDBMigration(migrationURL string, dbSource string) {
migration, err := migrate.New(migrationURL, dbSource)
if err != nil {
log.Fatal().Err(err).Msg("cannot create new migrate instance")
}
if err = migration.Up(); err != nil && err != migrate.ErrNoChange {
log.Fatal().Err(err).Msg("failed to run migrate up")
}
log.Info().Msg("db migrated successfully")
}
func runTaskProcessor(
ctx context.Context,
waitGroup *errgroup.Group,
config util.Config,
redisOpt asynq.RedisClientOpt,
store db.Store,
) {
mailer := mail.NewGmailSender(config.EmailSenderName, config.EmailSenderAddress, config.EmailSenderPassword)
taskProcessor := worker.NewRedisTaskProcessor(redisOpt, store, mailer)
log.Info().Msg("start task processor")
err := taskProcessor.Start()
if err != nil {
log.Fatal().Err(err).Msg("failed to start task processor")
}
waitGroup.Go(func() error {
<-ctx.Done()
log.Info().Msg("graceful shutdown task processor")
taskProcessor.Shutdown()
log.Info().Msg("task processor is stopped")
return nil
})
}
func runGrpcServer(
ctx context.Context,
waitGroup *errgroup.Group,
config util.Config,
store db.Store,
taskDistributor worker.TaskDistributor,
) {
server, err := gapi.NewServer(config, store, taskDistributor)
if err != nil {
log.Fatal().Err(err).Msg("cannot create server")
}
gprcLogger := grpc.UnaryInterceptor(gapi.GrpcLogger)
grpcServer := grpc.NewServer(gprcLogger)
pb.RegisterSimpleBankServer(grpcServer, server)
reflection.Register(grpcServer)
listener, err := net.Listen("tcp", config.GRPCServerAddress)
if err != nil {
log.Fatal().Err(err).Msg("cannot create listener")
}
waitGroup.Go(func() error {
log.Info().Msgf("start gRPC server at %s", listener.Addr().String())
err = grpcServer.Serve(listener)
if err != nil {
if errors.Is(err, grpc.ErrServerStopped) {
return nil
}
log.Error().Err(err).Msg("gRPC server failed to serve")
return err
}
return nil
})
waitGroup.Go(func() error {
<-ctx.Done()
log.Info().Msg("graceful shutdown gRPC server")
grpcServer.GracefulStop()
log.Info().Msg("gRPC server is stopped")
return nil
})
}
func runGatewayServer(
ctx context.Context,
waitGroup *errgroup.Group,
config util.Config,
store db.Store,
taskDistributor worker.TaskDistributor,
) {
server, err := gapi.NewServer(config, store, taskDistributor)
if err != nil {
log.Fatal().Err(err).Msg("cannot create server")
}
jsonOption := runtime.WithMarshalerOption(runtime.MIMEWildcard, &runtime.JSONPb{
MarshalOptions: protojson.MarshalOptions{
UseProtoNames: true,
},
UnmarshalOptions: protojson.UnmarshalOptions{
DiscardUnknown: true,
},
})
grpcMux := runtime.NewServeMux(jsonOption)
err = pb.RegisterSimpleBankHandlerServer(ctx, grpcMux, server)
if err != nil {
log.Fatal().Err(err).Msg("cannot register handler server")
}
mux := http.NewServeMux()
mux.Handle("/", grpcMux)
statikFS, err := fs.New()
if err != nil {
log.Fatal().Err(err).Msg("cannot create statik fs")
}
swaggerHandler := http.StripPrefix("/swagger/", http.FileServer(statikFS))
mux.Handle("/swagger/", swaggerHandler)
httpServer := &http.Server{
Handler: gapi.HttpLogger(mux),
Addr: config.HTTPServerAddress,
}
waitGroup.Go(func() error {
log.Info().Msgf("start HTTP gateway server at %s", httpServer.Addr)
err = httpServer.ListenAndServe()
if err != nil {
if errors.Is(err, http.ErrServerClosed) {
return nil
}
log.Error().Err(err).Msg("HTTP gateway server failed to serve")
return err
}
return nil
})
waitGroup.Go(func() error {
<-ctx.Done()
log.Info().Msg("graceful shutdown HTTP gateway server")
err := httpServer.Shutdown(context.Background())
if err != nil {
log.Error().Err(err).Msg("failed to shutdown HTTP gateway server")
return err
}
log.Info().Msg("HTTP gateway server is stopped")
return nil
})
}
func runGinServer(config util.Config, store db.Store) {
server, err := api.NewServer(config, store)
if err != nil {
log.Fatal().Err(err).Msg("cannot create server")
}
err = server.Start(config.HTTPServerAddress)
if err != nil {
log.Fatal().Err(err).Msg("cannot start server")
}
}