// Copyright (c) Mainflux // SPDX-License-Identifier: Apache-2.0 // Package main contains twins main function to start the twins service. package main import ( "context" "fmt" "log" "os" "github.com/go-redis/redis/v8" chclient "github.com/mainflux/callhome/pkg/client" "github.com/mainflux/mainflux" "github.com/mainflux/mainflux/internal" authclient "github.com/mainflux/mainflux/internal/clients/grpc/auth" jaegerclient "github.com/mainflux/mainflux/internal/clients/jaeger" mongoclient "github.com/mainflux/mainflux/internal/clients/mongo" redisclient "github.com/mainflux/mainflux/internal/clients/redis" "github.com/mainflux/mainflux/internal/env" "github.com/mainflux/mainflux/internal/server" httpserver "github.com/mainflux/mainflux/internal/server/http" mflog "github.com/mainflux/mainflux/logger" "github.com/mainflux/mainflux/pkg/messaging" "github.com/mainflux/mainflux/pkg/messaging/brokers" brokerstracing "github.com/mainflux/mainflux/pkg/messaging/brokers/tracing" "github.com/mainflux/mainflux/pkg/uuid" localusers "github.com/mainflux/mainflux/things/standalone" "github.com/mainflux/mainflux/twins" "github.com/mainflux/mainflux/twins/api" twapi "github.com/mainflux/mainflux/twins/api/http" "github.com/mainflux/mainflux/twins/events" twmongodb "github.com/mainflux/mainflux/twins/mongodb" "github.com/mainflux/mainflux/twins/tracing" "go.mongodb.org/mongo-driver/mongo" "go.opentelemetry.io/otel/trace" "golang.org/x/sync/errgroup" ) const ( svcName = "twins" envPrefixDB = "MF_TWINS_DB_" envPrefixHTTP = "MF_TWINS_HTTP_" envPrefixCache = "MF_TWINS_CACHE_" defSvcHTTPPort = "9018" ) type config struct { LogLevel string `env:"MF_TWINS_LOG_LEVEL" envDefault:"info"` StandaloneID string `env:"MF_TWINS_STANDALONE_ID" envDefault:""` StandaloneToken string `env:"MF_TWINS_STANDALONE_TOKEN" envDefault:""` ChannelID string `env:"MF_TWINS_CHANNEL_ID" envDefault:""` BrokerURL string `env:"MF_MESSAGE_BROKER_URL" envDefault:"nats://localhost:4222"` JaegerURL string `env:"MF_JAEGER_URL" envDefault:"http://jaeger:14268/api/traces"` SendTelemetry bool `env:"MF_SEND_TELEMETRY" envDefault:"true"` InstanceID string `env:"MF_TWINS_INSTANCE_ID" envDefault:""` ESURL string `env:"MF_TWINS_ES_URL" envDefault:"redis://localhost:6379/0"` } func main() { ctx, cancel := context.WithCancel(context.Background()) g, ctx := errgroup.WithContext(ctx) cfg := config{} if err := env.Parse(&cfg); err != nil { log.Fatalf("failed to load %s configuration : %s", svcName, err) } logger, err := mflog.New(os.Stdout, cfg.LogLevel) if err != nil { log.Fatalf("failed to init logger: %s", err) } var exitCode int defer mflog.ExitWithError(&exitCode) if cfg.InstanceID == "" { if cfg.InstanceID, err = uuid.New().ID(); err != nil { logger.Error(fmt.Sprintf("failed to generate instanceID: %s", err)) exitCode = 1 return } } httpServerConfig := server.Config{Port: defSvcHTTPPort} if err := env.Parse(&httpServerConfig, env.Options{Prefix: envPrefixHTTP}); err != nil { logger.Error(fmt.Sprintf("failed to load %s HTTP server configuration : %s", svcName, err)) exitCode = 1 return } cacheClient, err := redisclient.Setup(envPrefixCache) if err != nil { logger.Error(err.Error()) exitCode = 1 return } defer cacheClient.Close() db, err := mongoclient.Setup(envPrefixDB) if err != nil { logger.Error(fmt.Sprintf("failed to setup postgres database : %s", err)) exitCode = 1 return } tp, err := jaegerclient.NewProvider(svcName, cfg.JaegerURL, cfg.InstanceID) if err != nil { logger.Error(fmt.Sprintf("failed to init Jaeger: %s", err)) exitCode = 1 return } defer func() { if err := tp.Shutdown(ctx); err != nil { logger.Error(fmt.Sprintf("Error shutting down tracer provider: %v", err)) } }() tracer := tp.Tracer(svcName) var auth mainflux.AuthServiceClient switch cfg.StandaloneID != "" && cfg.StandaloneToken != "" { case true: auth = localusers.NewAuthService(cfg.StandaloneID, cfg.StandaloneToken) default: authServiceClient, authHandler, err := authclient.Setup(svcName) if err != nil { logger.Error(err.Error()) exitCode = 1 return } defer authHandler.Close() auth = authServiceClient logger.Info("Successfully connected to auth grpc server " + authHandler.Secure()) } pubSub, err := brokers.NewPubSub(ctx, cfg.BrokerURL, logger) if err != nil { logger.Error(fmt.Sprintf("failed to connect to message broker: %s", err)) exitCode = 1 return } defer pubSub.Close() pubSub = brokerstracing.NewPubSub(httpServerConfig, tracer, pubSub) svc, err := newService(ctx, svcName, pubSub, cfg, auth, tracer, db, cacheClient, logger) if err != nil { logger.Error(fmt.Sprintf("failed to create %s service: %s", svcName, err)) exitCode = 1 return } hs := httpserver.New(ctx, cancel, svcName, httpServerConfig, twapi.MakeHandler(svc, logger, cfg.InstanceID), logger) if cfg.SendTelemetry { chc := chclient.New(svcName, mainflux.Version, logger, cancel) go chc.CallHome(ctx) } g.Go(func() error { return hs.Start() }) g.Go(func() error { return server.StopSignalHandler(ctx, cancel, logger, svcName, hs) }) if err := g.Wait(); err != nil { logger.Error(fmt.Sprintf("Twins service terminated: %s", err)) } } func newService(ctx context.Context, id string, ps messaging.PubSub, cfg config, users mainflux.AuthServiceClient, tracer trace.Tracer, db *mongo.Database, cacheclient *redis.Client, logger mflog.Logger) (twins.Service, error) { twinRepo := twmongodb.NewTwinRepository(db) twinRepo = tracing.TwinRepositoryMiddleware(tracer, twinRepo) stateRepo := twmongodb.NewStateRepository(db) stateRepo = tracing.StateRepositoryMiddleware(tracer, stateRepo) idProvider := uuid.New() twinCache := events.NewTwinCache(cacheclient) twinCache = tracing.TwinCacheMiddleware(tracer, twinCache) svc := twins.New(ps, users, twinRepo, twinCache, stateRepo, idProvider, cfg.ChannelID, logger) var err error svc, err = events.NewEventStoreMiddleware(ctx, svc, cfg.ESURL) if err != nil { return nil, err } svc = api.LoggingMiddleware(svc, logger) counter, latency := internal.MakeMetrics(svcName, "api") svc = api.MetricsMiddleware(svc, counter, latency) subCfg := messaging.SubscriberConfig{ ID: id, Topic: brokers.SubjectAllChannels, Handler: handle(ctx, logger, cfg.ChannelID, svc), } if err = ps.Subscribe(ctx, subCfg); err != nil { logger.Fatal(err.Error()) } return svc, nil } func handle(ctx context.Context, logger mflog.Logger, chanID string, svc twins.Service) handlerFunc { return func(msg *messaging.Message) error { if msg.Channel == chanID { return nil } if err := svc.SaveStates(ctx, msg); err != nil { logger.Error(fmt.Sprintf("State save failed: %s", err)) return err } return nil } } type handlerFunc func(msg *messaging.Message) error func (h handlerFunc) Handle(msg *messaging.Message) error { return h(msg) } func (h handlerFunc) Cancel() error { return nil }