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main.go
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main.go
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package main
import (
"context"
"database/sql"
"net"
"net/http"
"os"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/hibiken/asynq"
"github.com/rakyll/statik/fs"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
"github.com/golang-migrate/migrate/v4"
_ "github.com/golang-migrate/migrate/v4/database/postgres"
_ "github.com/golang-migrate/migrate/v4/source/file"
_ "github.com/lib/pq"
_ "github.com/morka17/shiny_bank/v1/doc/statik"
"github.com/morka17/shiny_bank/v1/pb"
"github.com/morka17/shiny_bank/v1/src/api"
db "github.com/morka17/shiny_bank/v1/src/db/sqlc"
"github.com/morka17/shiny_bank/v1/src/gapi"
"github.com/morka17/shiny_bank/v1/src/mail"
"github.com/morka17/shiny_bank/v1/src/utils"
"github.com/morka17/shiny_bank/v1/src/worker"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
)
func main() {
config, err := utils.LoadConfig(".")
if err != nil {
log.Fatal().Msgf("cannot load config: %v", err)
}
if config.Environment == "development" {
log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
}
conn, err := sql.Open(config.DBDriver, config.DBSource)
if err != nil {
log.Fatal().Msgf("cannot connect to db: %v", err)
}
// run db migration
runDBMigration(config.MIGRATIONURL, config.DBSource)
store := db.NewStore(conn)
// Redis database connection
redisOpt := asynq.RedisClientOpt{
Addr: config.RedisAddress,
}
taskDistributor := worker.NewRedisTaskDistributor(redisOpt)
go runTaskProcessor(redisOpt, store, config)
go runGatewayServer(config, store, taskDistributor)
runGrpcServer(config, store, taskDistributor)
}
// RUN database migration
func runDBMigration(migrationURL string, dbSource string) {
migration, err := migrate.New(migrationURL, dbSource)
if err != nil {
log.Fatal().Msgf("cannot createa a new migrate instance %v", err)
}
if err = migration.Up(); err != nil && err != migrate.ErrNoChange {
log.Fatal().Msgf("Failed to run migrate up: %v", err)
}
log.Info().Msg("Database migrated successful")
}
func runGrpcServer(config utils.Config, store db.Store, taskDistributor worker.TaskDistributor) {
server, err := gapi.NewServer(config, store, taskDistributor)
if err != nil {
log.Fatal().Msgf("Cannot create server: %v", err)
}
grpc.UnaryInterceptor(gapi.GrpcLogger)
grpcServer := grpc.NewServer()
pb.RegisterSimpleBankServer(grpcServer, server)
reflection.Register(grpcServer) // For client exploiration
listener, err := net.Listen("tcp", config.GRPCServerAddress)
if err != nil {
log.Fatal().Msgf("cannot create listener: %v", err)
}
log.Info().Msgf("start gRPC server at %s", listener.Addr().String())
err = grpcServer.Serve(listener)
if err != nil {
log.Fatal().Msgf("cannot create server: %v", err)
}
}
func runGinServer(config utils.Config, store db.Store) {
server, err := api.NewServer(config, store)
if err != nil {
log.Fatal().Msgf("Cannot create server: %v", err)
}
err = server.Start(config.HTTPServerAddress)
if err != nil {
log.Fatal().Msgf("cannot start server: %v", err)
}
}
func runGatewayServer(config utils.Config, store db.Store, taskDistributor worker.TaskDistributor) {
server, err := gapi.NewServer(config, store, taskDistributor)
if err != nil {
log.Fatal().Msgf("Cannot create server: %v", err)
}
grpcMux := runtime.NewServeMux()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
err = pb.RegisterSimpleBankHandlerServer(ctx, grpcMux, server)
if err != nil {
log.Fatal().Msgf("cannot register handler server: %v", err)
}
mux := http.NewServeMux()
mux.Handle("/", grpcMux)
statikFS, err := fs.New()
if err != nil {
log.Fatal().Msgf("cannot create statik fs %v", err)
}
swaggerHandler := http.StripPrefix("/swagger/", http.FileServer(statikFS))
mux.Handle("/swagger/", swaggerHandler)
listener, err := net.Listen("tcp", config.HTTPServerAddress)
if err != nil {
log.Fatal().Msgf("cannot create listener: %v", err)
}
log.Printf("start HTTP server at %s", listener.Addr().String())
handler := gapi.HttpLogger(mux)
err = http.Serve(listener, handler)
if err != nil {
log.Fatal().Msgf("cannot http gateway server: %v", err)
}
}
func runTaskProcessor(redisOpt asynq.RedisClientOpt, store db.Store, config utils.Config) {
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")
}
}