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main.go
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main.go
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// 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 subscribeToOpcuaServer(gc opcua.Subscriber, cfg opcua.Config, logger logger.Logger) {
if err := gc.Subscribe(context.Background(), cfg); err != nil {
logger.Warn(fmt.Sprintf("OPC-UA 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
}
}