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server.go

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package main

import (

"context"

"errors"

"fmt"

"log/slog"

"net/http"

"os"

"os/signal"

"strconv"

"time"

"github.com/alexedwards/scs/v2"

"github.com/nats-io/nats-server/v2/server"

"github.com/nats-io/nats.go"

"github.com/nats-io/nats.go/jetstream"

"exampleapp/internal/natsstore"

)

func (app *application) serve() error {

ctx := context.Background()

natsSrv, err := app.natsServe()

if err != nil {

return err

}

if err = app.startSessions(ctx); err != nil {

return err

}

if err = app.startCache(ctx); err != nil {

return err

}

srv := &http.Server{

Addr: fmt.Sprintf(":%d", 8080),

Handler: app.routes(),

IdleTimeout: time.Minute,

ReadTimeout: 5 * time.Second,

WriteTimeout: 10 * time.Second,

ErrorLog: slog.NewLogLogger(app.logger.Handler(), slog.LevelError),

}

shutdownError := make(chan error)

go func() {

quit := make(chan os.Signal, 1)

signal.Notify(quit, os.Interrupt)

s := <-quit

app.logger.Info("shutting down servers", slog.String("signal", s.String()))

ctxCancel, cancel := context.WithTimeout(context.Background(), 30*time.Second)

defer cancel()

app.logger.Info("closing NATS client connection")

app.natsClient.Close()

// Shutdown the NATS server

app.logger.Info("shutting down embedded NATS server")

natsSrv.Shutdown()

app.logger.Info("stopped embedded NATS server")

app.logger.Info("shutting down http server")

shutdownError <- srv.Shutdown(ctxCancel)

}()

app.logger.Info("starting http server", slog.String("addr", srv.Addr))

if err = srv.ListenAndServe(); err != nil {

if !errors.Is(err, http.ErrServerClosed) {

return err

}

}

if err = <-shutdownError; err != nil {

return err

}

app.logger.Info("stopped http server", slog.String("addr", srv.Addr))

return nil

}

func (app *application) natsServe() (*server.Server, error) {

var err error

opts := &server.Options{

Host: app.config.nats.address,

Port: app.config.nats.port,

JetStream: true, // required

StoreDir: app.config.nats.storeDir,

NoSigs: true, // required

}

app.logger.Info(

"starting embedded NATS server",

slog.String("addr", opts.Host+":"+strconv.Itoa(opts.Port)),

slog.String("store-dir", opts.StoreDir),

slog.Bool("jetstream-enabled", opts.JetStream),

)

srv, err := server.NewServer(opts)

if err != nil {

return nil, err

}

go srv.Start()

if !srv.ReadyForConnections(5 * time.Second) {

return nil, errors.New("nats server not ready")

}

nc, err := nats.Connect(fmt.Sprintf("nats://%s:%d", app.config.nats.address, app.config.nats.port))

if err != nil {

return nil, err

}

app.natsClient = nc

return srv, nil

}

func (app *application) startSessions(ctx context.Context) error {

js, err := jetstream.New(app.natsClient)

if err != nil {

return err

}

sessionStore := natsstore.Must(

natsstore.New(

ctx,

js,

jetstream.KeyValueConfig{

Bucket: app.config.sessions.bucketName,

Compression: true,

TTL: app.config.sessions.TTL,

},

natsstore.WithPrefix(app.config.sessions.prefix),

),

)

app.sessions = scs.New()

app.sessions.Store = sessionStore

return nil

}

func (app *application) startCache(ctx context.Context) error {

js, err := jetstream.New(app.natsClient)

if err != nil {

return err

}

cacheStore, err := js.CreateKeyValue(ctx, jetstream.KeyValueConfig{

Bucket: app.config.cache.bucketName,

Compression: true,

TTL: app.config.cache.TTL,

})

if err != nil {

return err

}

app.cache = cacheStore

return nil

}