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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"
"github.com/MainfluxLabs/mainflux"
"github.com/MainfluxLabs/mainflux/logger"
"github.com/MainfluxLabs/mainflux/lora"
"github.com/MainfluxLabs/mainflux/lora/api"
"github.com/MainfluxLabs/mainflux/lora/mqtt"
"github.com/MainfluxLabs/mainflux/pkg/errors"
"github.com/MainfluxLabs/mainflux/pkg/messaging/brokers"
mqttPaho "github.com/eclipse/paho.mqtt.golang"
r "github.com/go-redis/redis/v8"
"golang.org/x/sync/errgroup"
"github.com/MainfluxLabs/mainflux/lora/redis"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
stdprometheus "github.com/prometheus/client_golang/prometheus"
)
const (
stopWaitTime = 5 * time.Second
defLogLevel = "error"
defHTTPPort = "8180"
defMsgURL = "tcp://localhost:1883"
defBrokerURL = "nats://localhost:4222"
defMsgTopic = "application/+/device/+/event/up"
defMsgUser = ""
defMsgPass = ""
defMsgTimeout = "30s"
defESURL = "localhost:6379"
defESPass = ""
defESDB = "0"
defESConsumerName = "lora"
defRouteMapURL = "localhost:6379"
defRouteMapPass = ""
defRouteMapDB = "0"
envHTTPPort = "MF_LORA_ADAPTER_HTTP_PORT"
envMsgURL = "MF_LORA_ADAPTER_MESSAGES_URL"
envBrokerURL = "MF_BROKER_URL"
envMsgTopic = "MF_LORA_ADAPTER_MESSAGES_TOPIC"
envMsgUser = "MF_LORA_ADAPTER_MESSAGES_USER"
envMsgPass = "MF_LORA_ADAPTER_MESSAGES_PASS"
envMsgTimeout = "MF_LORA_ADAPTER_MESSAGES_TIMEOUT"
envLogLevel = "MF_LORA_ADAPTER_LOG_LEVEL"
envESURL = "MF_THINGS_ES_URL"
envESPass = "MF_THINGS_ES_PASS"
envESDB = "MF_THINGS_ES_DB"
envESConsumerName = "MF_LORA_ADAPTER_EVENT_CONSUMER"
envRouteMapURL = "MF_LORA_ADAPTER_ROUTE_MAP_URL"
envRouteMapPass = "MF_LORA_ADAPTER_ROUTE_MAP_PASS"
envRouteMapDB = "MF_LORA_ADAPTER_ROUTE_MAP_DB"
thingsRMPrefix = "thing"
channelsRMPrefix = "channel"
connsRMPrefix = "connection"
)
type config struct {
httpPort string
msgURL string
brokerURL string
msgUser string
msgPass string
msgTopic string
msgTimeout time.Duration
logLevel string
esURL string
esPass string
esDB string
esConsumerName string
routeMapURL string
routeMapPass string
routeMapDB string
}
func main() {
cfg := loadConfig()
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
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()
esConn := connectToRedis(cfg.esURL, cfg.esPass, cfg.esDB, logger)
defer esConn.Close()
pub, err := brokers.NewPublisher(cfg.brokerURL)
if err != nil {
logger.Error(fmt.Sprintf("Failed to connect to message broker: %s", err))
os.Exit(1)
}
defer pub.Close()
thingsRM := newRouteMapRepository(rmConn, thingsRMPrefix, logger)
chansRM := newRouteMapRepository(rmConn, channelsRMPrefix, logger)
connsRM := newRouteMapRepository(rmConn, connsRMPrefix, logger)
svc := lora.New(pub, thingsRM, chansRM, connsRM)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "lora_adapter",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "lora_adapter",
Subsystem: "api",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
mqttConn := connectToMQTTBroker(cfg.msgURL, cfg.msgUser, cfg.msgPass, cfg.msgTimeout, logger)
go subscribeToLoRaBroker(svc, mqttConn, cfg.msgTimeout, cfg.msgTopic, logger)
go subscribeToThingsES(svc, esConn, cfg.esConsumerName, logger)
g.Go(func() error {
return startHTTPServer(ctx, cfg, logger)
})
g.Go(func() error {
if sig := errors.SignalHandler(ctx); sig != nil {
cancel()
logger.Info(fmt.Sprintf("LoRa adapter shutdown by signal: %s", sig))
}
return nil
})
if err := g.Wait(); err != nil {
logger.Error(fmt.Sprintf("LoRa adapter terminated: %s", err))
}
}
func loadConfig() config {
mqttTimeout, err := time.ParseDuration(mainflux.Env(envMsgTimeout, defMsgTimeout))
if err != nil {
log.Fatalf("Invalid %s value: %s", envMsgTimeout, err.Error())
}
return config{
httpPort: mainflux.Env(envHTTPPort, defHTTPPort),
msgURL: mainflux.Env(envMsgURL, defMsgURL),
brokerURL: mainflux.Env(envBrokerURL, defBrokerURL),
msgTopic: mainflux.Env(envMsgTopic, defMsgTopic),
msgUser: mainflux.Env(envMsgUser, defMsgUser),
msgPass: mainflux.Env(envMsgPass, defMsgPass),
msgTimeout: mqttTimeout,
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 connectToMQTTBroker(url, user, password string, timeout time.Duration, logger logger.Logger) mqttPaho.Client {
opts := mqttPaho.NewClientOptions()
opts.AddBroker(url)
opts.SetUsername(user)
opts.SetPassword(password)
opts.SetOnConnectHandler(func(c mqttPaho.Client) {
logger.Info("Connected to Lora MQTT broker")
})
opts.SetConnectionLostHandler(func(c mqttPaho.Client, err error) {
logger.Error(fmt.Sprintf("MQTT connection lost: %s", err.Error()))
os.Exit(1)
})
client := mqttPaho.NewClient(opts)
if token := client.Connect(); token.WaitTimeout(timeout) && token.Error() != nil {
logger.Error(fmt.Sprintf("Failed to connect to Lora MQTT broker: %s", token.Error()))
os.Exit(1)
}
return client
}
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 subscribeToLoRaBroker(svc lora.Service, mc mqttPaho.Client, timeout time.Duration, topic string, logger logger.Logger) {
mqtt := mqtt.NewBroker(svc, mc, timeout, logger)
logger.Info("Subscribed to Lora MQTT broker")
if err := mqtt.Subscribe(topic); err != nil {
logger.Error(fmt.Sprintf("Failed to subscribe to Lora MQTT broker: %s", err))
os.Exit(1)
}
}
func subscribeToThingsES(svc lora.Service, client *r.Client, consumer string, logger logger.Logger) {
eventStore := redis.NewEventStore(svc, client, consumer, logger)
logger.Info("Subscribed to Redis Event Store")
if err := eventStore.Subscribe(context.Background(), "mainflux.things"); err != nil {
logger.Warn(fmt.Sprintf("Lora-adapter service failed to subscribe to Redis event source: %s", err))
}
}
func newRouteMapRepository(client *r.Client, prefix string, logger logger.Logger) lora.RouteMapRepository {
logger.Info(fmt.Sprintf("Connected to %s Redis Route-map", prefix))
return redis.NewRouteMapRepository(client, prefix)
}
func startHTTPServer(ctx context.Context, cfg config, logger logger.Logger) error {
p := fmt.Sprintf(":%s", cfg.httpPort)
errCh := make(chan error)
server := &http.Server{Addr: p, Handler: api.MakeHandler()}
logger.Info(fmt.Sprintf("LoRa-adapter service started, exposed port %s", cfg.httpPort))
go func() {
errCh <- http.ListenAndServe(p, api.MakeHandler())
}()
select {
case <-ctx.Done():
ctxShutdown, cancelShutdown := context.WithTimeout(context.Background(), stopWaitTime)
defer cancelShutdown()
if err := server.Shutdown(ctxShutdown); err != nil {
logger.Error(fmt.Sprintf("LoRa-adapter service error occurred during shutdown at %s: %s", p, err))
return fmt.Errorf("LoRa-adapter service error occurred during shutdown at %s: %w", p, err)
}
logger.Info(fmt.Sprintf("LoRa-adapter service shutdown of http at %s", p))
return nil
case err := <-errCh:
return err
}
}