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main.go
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main.go
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package main
import (
"context"
"database/sql"
"fmt"
"net/http"
"os"
"os/signal"
"strings"
"sync"
"time"
echologrus "github.com/davrux/echo-logrus/v4"
"github.com/getAlby/nostr-wallet-connect/migrations"
"github.com/glebarez/sqlite"
"github.com/joho/godotenv"
"github.com/kelseyhightower/envconfig"
"github.com/labstack/echo/v4"
"github.com/nbd-wtf/go-nostr"
"github.com/nbd-wtf/go-nostr/nip19"
log "github.com/sirupsen/logrus"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
"gorm.io/driver/postgres"
"gorm.io/gorm"
"github.com/jackc/pgx/v5/stdlib"
sqltrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/database/sql"
gormtrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/gorm.io/gorm.v1"
)
func main() {
// Load config from environment variables / .env file
godotenv.Load(".env")
cfg := &Config{}
err := envconfig.Process("", cfg)
if err != nil {
log.Fatalf("Error loading environment variables: %v", err)
}
var db *gorm.DB
var sqlDb *sql.DB
if strings.HasPrefix(cfg.DatabaseUri, "postgres://") || strings.HasPrefix(cfg.DatabaseUri, "postgresql://") || strings.HasPrefix(cfg.DatabaseUri, "unix://") {
if os.Getenv("DATADOG_AGENT_URL") != "" {
sqltrace.Register("pgx", &stdlib.Driver{}, sqltrace.WithServiceName("nostr-wallet-connect"))
sqlDb, err = sqltrace.Open("pgx", cfg.DatabaseUri)
if err != nil {
log.Fatalf("Failed to open DB %v", err)
}
db, err = gormtrace.Open(postgres.New(postgres.Config{Conn: sqlDb}), &gorm.Config{})
if err != nil {
log.Fatalf("Failed to open DB %v", err)
}
} else {
db, err = gorm.Open(postgres.Open(cfg.DatabaseUri), &gorm.Config{})
if err != nil {
log.Fatalf("Failed to open DB %v", err)
}
sqlDb, err = db.DB()
if err != nil {
log.Fatalf("Failed to set DB config: %v", err)
}
}
} else {
db, err = gorm.Open(sqlite.Open(cfg.DatabaseUri), &gorm.Config{})
if err != nil {
log.Fatalf("Failed to open DB %v", err)
}
// Override SQLite config to max one connection
cfg.DatabaseMaxConns = 1
// Enable foreign keys for sqlite
db.Exec("PRAGMA foreign_keys=ON;")
sqlDb, err = db.DB()
if err != nil {
log.Fatalf("Failed to set DB config: %v", err)
}
}
sqlDb.SetMaxOpenConns(cfg.DatabaseMaxConns)
sqlDb.SetMaxIdleConns(cfg.DatabaseMaxIdleConns)
sqlDb.SetConnMaxLifetime(time.Duration(cfg.DatabaseConnMaxLifetime) * time.Second)
err = migrations.Migrate(db)
if err != nil {
log.Fatalf("Migration failed: %v", err)
}
log.Println("Any pending migrations ran successfully")
if cfg.NostrSecretKey == "" {
if cfg.LNBackendType == AlbyBackendType {
//not allowed
log.Fatal("Nostr private key is required with this backend type.")
}
//first look up if we already have the private key in the database
//else, generate and store private key
identity := &Identity{}
err = db.FirstOrInit(identity).Error
if err != nil {
log.WithError(err).Fatal("Error retrieving private key from database")
}
if identity.Privkey == "" {
log.Info("No private key found in database, generating & saving.")
identity.Privkey = nostr.GeneratePrivateKey()
err = db.Save(identity).Error
if err != nil {
log.WithError(err).Fatal("Error saving private key to database")
}
}
cfg.NostrSecretKey = identity.Privkey
}
identityPubkey, err := nostr.GetPublicKey(cfg.NostrSecretKey)
if err != nil {
log.Fatalf("Error converting nostr privkey to pubkey: %v", err)
}
cfg.IdentityPubkey = identityPubkey
npub, err := nip19.EncodePublicKey(identityPubkey)
if err != nil {
log.Fatalf("Error converting nostr privkey to pubkey: %v", err)
}
log.Infof("Starting nostr-wallet-connect. npub: %s hex: %s", npub, identityPubkey)
svc := &Service{
cfg: cfg,
db: db,
}
if os.Getenv("DATADOG_AGENT_URL") != "" {
tracer.Start(tracer.WithService("nostr-wallet-connect"))
defer tracer.Stop()
}
echologrus.Logger = log.New()
echologrus.Logger.SetFormatter(&log.JSONFormatter{})
echologrus.Logger.SetOutput(os.Stdout)
echologrus.Logger.SetLevel(log.InfoLevel)
svc.Logger = echologrus.Logger
e := echo.New()
ctx := context.Background()
ctx, _ = signal.NotifyContext(ctx, os.Interrupt)
var wg sync.WaitGroup
switch cfg.LNBackendType {
case LNDBackendType:
lndClient, err := NewLNDService(ctx, svc, e)
if err != nil {
svc.Logger.Fatal(err)
}
svc.lnClient = lndClient
case AlbyBackendType:
oauthService, err := NewAlbyOauthService(svc, e)
if err != nil {
svc.Logger.Fatal(err)
}
svc.lnClient = oauthService
}
//register shared routes
svc.RegisterSharedRoutes(e)
//start Echo server
wg.Add(1)
go func() {
if err := e.Start(fmt.Sprintf(":%v", svc.cfg.Port)); err != nil && err != http.ErrServerClosed {
e.Logger.Fatal("shutting down the server")
}
//handle graceful shutdown
<-ctx.Done()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
e.Shutdown(ctx)
svc.Logger.Info("Echo server exited")
wg.Done()
}()
//connect to the relay
svc.Logger.Infof("Connecting to the relay: %s", cfg.Relay)
relay, err := nostr.RelayConnect(ctx, cfg.Relay, nostr.WithNoticeHandler(svc.noticeHandler))
if err != nil {
svc.Logger.Fatal(err)
}
//publish event with NIP-47 info
err = svc.PublishNip47Info(ctx, relay)
if err != nil {
svc.Logger.WithError(err).Error("Could not publish NIP47 info")
}
//Start infinite loop which will be only broken by canceling ctx (SIGINT)
//TODO: we can start this loop for multiple relays
for {
svc.Logger.Info("Subscribing to events")
sub, err := relay.Subscribe(ctx, svc.createFilters())
if err != nil {
svc.Logger.Fatal(err)
}
err = svc.StartSubscription(ctx, sub)
if err != nil {
//err being non-nil means that we have an error on the websocket error channel. In this case we just try to reconnect.
svc.Logger.WithError(err).Error("Got an error from the relay while listening to subscription. Reconnecting...")
relay, err = nostr.RelayConnect(ctx, cfg.Relay)
if err != nil {
svc.Logger.Fatal(err)
}
continue
}
//err being nil means that the context was canceled and we should exit the program.
break
}
err = relay.Close()
if err != nil {
svc.Logger.Error(err)
}
svc.Logger.Info("Graceful shutdown completed. Goodbye.")
}
func (svc *Service) createFilters() nostr.Filters {
filter := nostr.Filter{
Tags: nostr.TagMap{"p": []string{svc.cfg.IdentityPubkey}},
Kinds: []int{NIP_47_REQUEST_KIND},
}
if svc.cfg.ClientPubkey != "" {
filter.Authors = []string{svc.cfg.ClientPubkey}
}
return []nostr.Filter{filter}
}
func (svc *Service) noticeHandler(notice string) {
svc.Logger.Infof("Received a notice %s", notice)
}