// Copyright (c) Mainflux // SPDX-License-Identifier: Apache-2.0 package main import ( "context" "fmt" "log" "net/http" "os" "strconv" "time" r "github.com/go-redis/redis/v8" "github.com/mainflux/mainflux" "github.com/mainflux/mainflux/logger" "github.com/mainflux/mainflux/opcua" "github.com/mainflux/mainflux/opcua/api" "github.com/mainflux/mainflux/opcua/db" "github.com/mainflux/mainflux/opcua/gopcua" "github.com/mainflux/mainflux/opcua/redis" "github.com/mainflux/mainflux/pkg/errors" "github.com/mainflux/mainflux/pkg/messaging/nats" "golang.org/x/sync/errgroup" kitprometheus "github.com/go-kit/kit/metrics/prometheus" stdprometheus "github.com/prometheus/client_golang/prometheus" ) const ( stopWaitTime = 5 * time.Second defLogLevel = "error" defHTTPPort = "8180" defOPCIntervalMs = "1000" defOPCPolicy = "" defOPCMode = "" defOPCCertFile = "" defOPCKeyFile = "" defNatsURL = "nats://localhost:4222" defESURL = "localhost:6379" defESPass = "" defESDB = "0" defESConsumerName = "opcua" defRouteMapURL = "localhost:6379" defRouteMapPass = "" defRouteMapDB = "0" envLogLevel = "MF_OPCUA_ADAPTER_LOG_LEVEL" envHTTPPort = "MF_OPCUA_ADAPTER_HTTP_PORT" envOPCIntervalMs = "MF_OPCUA_ADAPTER_INTERVAL_MS" envOPCPolicy = "MF_OPCUA_ADAPTER_POLICY" envOPCMode = "MF_OPCUA_ADAPTER_MODE" envOPCCertFile = "MF_OPCUA_ADAPTER_CERT_FILE" envOPCKeyFile = "MF_OPCUA_ADAPTER_KEY_FILE" envNatsURL = "MF_NATS_URL" envESURL = "MF_THINGS_ES_URL" envESPass = "MF_THINGS_ES_PASS" envESDB = "MF_THINGS_ES_DB" envESConsumerName = "MF_OPCUA_ADAPTER_EVENT_CONSUMER" envRouteMapURL = "MF_OPCUA_ADAPTER_ROUTE_MAP_URL" envRouteMapPass = "MF_OPCUA_ADAPTER_ROUTE_MAP_PASS" envRouteMapDB = "MF_OPCUA_ADAPTER_ROUTE_MAP_DB" thingsRMPrefix = "thing" channelsRMPrefix = "channel" connectionRMPrefix = "connection" ) type config struct { httpPort string opcuaConfig opcua.Config natsURL string logLevel string esURL string esPass string esDB string esConsumerName string routeMapURL string routeMapPass string routeMapDB string } func main() { cfg := loadConfig() httpCtx, httpCancel := context.WithCancel(context.Background()) g, httpCtx := errgroup.WithContext(httpCtx) logger, err := logger.New(os.Stdout, cfg.logLevel) if err != nil { log.Fatalf(err.Error()) } rmConn := connectToRedis(cfg.routeMapURL, cfg.routeMapPass, cfg.routeMapDB, logger) defer rmConn.Close() thingRM := newRouteMapRepositoy(rmConn, thingsRMPrefix, logger) chanRM := newRouteMapRepositoy(rmConn, channelsRMPrefix, logger) connRM := newRouteMapRepositoy(rmConn, connectionRMPrefix, logger) esConn := connectToRedis(cfg.esURL, cfg.esPass, cfg.esDB, logger) defer esConn.Close() pubSub, err := nats.NewPubSub(cfg.natsURL, "", logger) if err != nil { logger.Error(fmt.Sprintf("Failed to connect to NATS: %s", err)) os.Exit(1) } defer pubSub.Close() ctx := context.Background() sub := gopcua.NewSubscriber(ctx, pubSub, thingRM, chanRM, connRM, logger) browser := gopcua.NewBrowser(ctx, logger) svc := opcua.New(sub, browser, thingRM, chanRM, connRM, cfg.opcuaConfig, logger) svc = api.LoggingMiddleware(svc, logger) svc = api.MetricsMiddleware( svc, kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{ Namespace: "opc_adapter", Subsystem: "api", Name: "request_count", Help: "Number of requests received.", }, []string{"method"}), kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{ Namespace: "opc_adapter", Subsystem: "api", Name: "request_latency_microseconds", Help: "Total duration of requests in microseconds.", }, []string{"method"}), ) go subscribeToStoredSubs(sub, cfg.opcuaConfig, logger) go subscribeToThingsES(svc, esConn, cfg.esConsumerName, logger) g.Go(func() error { return startHTTPServer(httpCtx, svc, cfg, logger) }) g.Go(func() error { if sig := errors.SignalHandler(httpCtx); sig != nil { httpCancel() logger.Info(fmt.Sprintf("OPC-UA adapter service shutdown by signal: %s", sig)) } return nil }) if err := g.Wait(); err != nil { logger.Error(fmt.Sprintf("OPC-UA adapter service terminated: %s", err)) } } func loadConfig() config { oc := opcua.Config{ Interval: mainflux.Env(envOPCIntervalMs, defOPCIntervalMs), Policy: mainflux.Env(envOPCPolicy, defOPCPolicy), Mode: mainflux.Env(envOPCMode, defOPCMode), CertFile: mainflux.Env(envOPCCertFile, defOPCCertFile), KeyFile: mainflux.Env(envOPCKeyFile, defOPCKeyFile), } return config{ httpPort: mainflux.Env(envHTTPPort, defHTTPPort), opcuaConfig: oc, natsURL: mainflux.Env(envNatsURL, defNatsURL), logLevel: mainflux.Env(envLogLevel, defLogLevel), esURL: mainflux.Env(envESURL, defESURL), esPass: mainflux.Env(envESPass, defESPass), esDB: mainflux.Env(envESDB, defESDB), esConsumerName: mainflux.Env(envESConsumerName, defESConsumerName), routeMapURL: mainflux.Env(envRouteMapURL, defRouteMapURL), routeMapPass: mainflux.Env(envRouteMapPass, defRouteMapPass), routeMapDB: mainflux.Env(envRouteMapDB, defRouteMapDB), } } func connectToRedis(redisURL, redisPass, redisDB string, logger logger.Logger) *r.Client { db, err := strconv.Atoi(redisDB) if err != nil { logger.Error(fmt.Sprintf("Failed to connect to redis: %s", err)) os.Exit(1) } return r.NewClient(&r.Options{ Addr: redisURL, Password: redisPass, DB: db, }) } func subscribeToStoredSubs(sub opcua.Subscriber, cfg opcua.Config, logger logger.Logger) { // Get all stored subscriptions nodes, err := db.ReadAll() if err != nil { logger.Warn(fmt.Sprintf("Read stored subscriptions failed: %s", err)) } for _, n := range nodes { cfg.ServerURI = n.ServerURI cfg.NodeID = n.NodeID go func() { if err := sub.Subscribe(context.Background(), cfg); err != nil { logger.Warn(fmt.Sprintf("Subscription failed: %s", err)) } }() } } func subscribeToThingsES(svc opcua.Service, client *r.Client, prefix string, logger logger.Logger) { eventStore := redis.NewEventStore(svc, client, prefix, logger) if err := eventStore.Subscribe(context.Background(), "mainflux.things"); err != nil { logger.Warn(fmt.Sprintf("Failed to subscribe to Redis event source: %s", err)) } } func newRouteMapRepositoy(client *r.Client, prefix string, logger logger.Logger) opcua.RouteMapRepository { logger.Info(fmt.Sprintf("Connected to %s Redis Route-map", prefix)) return redis.NewRouteMapRepository(client, prefix) } func startHTTPServer(ctx context.Context, svc opcua.Service, cfg config, logger logger.Logger) error { p := fmt.Sprintf(":%s", cfg.httpPort) errCh := make(chan error) server := &http.Server{Addr: p, Handler: api.MakeHandler(svc, logger)} logger.Info(fmt.Sprintf("OPC-UA adapter service started, exposed port %s", cfg.httpPort)) go func() { errCh <- server.ListenAndServe() }() select { case <-ctx.Done(): ctxShutdown, cancelShutdown := context.WithTimeout(context.Background(), stopWaitTime) defer cancelShutdown() if err := server.Shutdown(ctxShutdown); err != nil { logger.Error(fmt.Sprintf("OPC-UA adapter service error occurred during shutdown at %s: %s", p, err)) return fmt.Errorf("OPC-UA adapter service error occurred during shutdown at %s: %w", p, err) } logger.Info(fmt.Sprintf("OPC-UA adapter service shutdown of http at %s", p)) return nil case err := <-errCh: return err } }