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main.go
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main.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
// Package main contains lora main function to start the lora service.
package main
import (
"context"
"fmt"
"log"
"log/slog"
"net/url"
"os"
"time"
chclient "github.com/absmach/callhome/pkg/client"
"github.com/absmach/magistrala"
"github.com/absmach/magistrala/internal"
"github.com/absmach/magistrala/internal/clients/jaeger"
redisclient "github.com/absmach/magistrala/internal/clients/redis"
"github.com/absmach/magistrala/internal/server"
httpserver "github.com/absmach/magistrala/internal/server/http"
mglog "github.com/absmach/magistrala/logger"
"github.com/absmach/magistrala/lora"
"github.com/absmach/magistrala/lora/api"
"github.com/absmach/magistrala/lora/events"
"github.com/absmach/magistrala/lora/mqtt"
"github.com/absmach/magistrala/pkg/events/store"
"github.com/absmach/magistrala/pkg/messaging"
"github.com/absmach/magistrala/pkg/messaging/brokers"
brokerstracing "github.com/absmach/magistrala/pkg/messaging/brokers/tracing"
"github.com/absmach/magistrala/pkg/uuid"
"github.com/caarlos0/env/v10"
mqttpaho "github.com/eclipse/paho.mqtt.golang"
"github.com/go-redis/redis/v8"
"golang.org/x/sync/errgroup"
)
const (
svcName = "lora-adapter"
envPrefixHTTP = "MG_LORA_ADAPTER_HTTP_"
defSvcHTTPPort = "9017"
thingsRMPrefix = "thing"
channelsRMPrefix = "channel"
connsRMPrefix = "connection"
thingsStream = "magistrala.things"
)
type config struct {
LogLevel string `env:"MG_LORA_ADAPTER_LOG_LEVEL" envDefault:"info"`
LoraMsgURL string `env:"MG_LORA_ADAPTER_MESSAGES_URL" envDefault:"tcp://localhost:1883"`
LoraMsgUser string `env:"MG_LORA_ADAPTER_MESSAGES_USER" envDefault:""`
LoraMsgPass string `env:"MG_LORA_ADAPTER_MESSAGES_PASS" envDefault:""`
LoraMsgTopic string `env:"MG_LORA_ADAPTER_MESSAGES_TOPIC" envDefault:"application/+/device/+/event/up"`
LoraMsgTimeout time.Duration `env:"MG_LORA_ADAPTER_MESSAGES_TIMEOUT" envDefault:"30s"`
ESConsumerName string `env:"MG_LORA_ADAPTER_EVENT_CONSUMER" envDefault:"lora-adapter"`
BrokerURL string `env:"MG_MESSAGE_BROKER_URL" envDefault:"nats://localhost:4222"`
JaegerURL url.URL `env:"MG_JAEGER_URL" envDefault:"http://localhost:14268/api/traces"`
SendTelemetry bool `env:"MG_SEND_TELEMETRY" envDefault:"true"`
InstanceID string `env:"MG_LORA_ADAPTER_INSTANCE_ID" envDefault:""`
ESURL string `env:"MG_ES_URL" envDefault:"nats://localhost:4222"`
RouteMapURL string `env:"MG_LORA_ADAPTER_ROUTE_MAP_URL" envDefault:"redis://localhost:6379/0"`
TraceRatio float64 `env:"MG_JAEGER_TRACE_RATIO" envDefault:"1.0"`
}
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 := mglog.New(os.Stdout, cfg.LogLevel)
if err != nil {
log.Fatalf("failed to init logger: %s", err.Error())
}
var exitCode int
defer mglog.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.ParseWithOptions(&httpServerConfig, env.Options{Prefix: envPrefixHTTP}); err != nil {
logger.Error(fmt.Sprintf("failed to load %s HTTP server configuration : %s", svcName, err))
exitCode = 1
return
}
rmConn, err := redisclient.Connect(cfg.RouteMapURL)
if err != nil {
logger.Error(fmt.Sprintf("failed to setup route map redis client : %s", err))
exitCode = 1
return
}
defer rmConn.Close()
tp, err := jaeger.NewProvider(ctx, svcName, cfg.JaegerURL, cfg.InstanceID, cfg.TraceRatio)
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)
pub, err := brokers.NewPublisher(ctx, cfg.BrokerURL)
if err != nil {
logger.Error(fmt.Sprintf("failed to connect to message broker: %s", err))
exitCode = 1
return
}
defer pub.Close()
pub = brokerstracing.NewPublisher(httpServerConfig, tracer, pub)
svc := newService(pub, rmConn, thingsRMPrefix, channelsRMPrefix, connsRMPrefix, logger)
mqttConn, err := connectToMQTTBroker(cfg.LoraMsgURL, cfg.LoraMsgUser, cfg.LoraMsgPass, cfg.LoraMsgTimeout, logger)
if err != nil {
logger.Error(err.Error())
exitCode = 1
return
}
if err = subscribeToLoRaBroker(svc, mqttConn, cfg.LoraMsgTimeout, cfg.LoraMsgTopic, logger); err != nil {
logger.Error(fmt.Sprintf("failed to subscribe to Lora MQTT broker: %s", err))
exitCode = 1
return
}
if err = subscribeToThingsES(ctx, svc, cfg, logger); err != nil {
logger.Error(fmt.Sprintf("failed to subscribe to things event store: %s", err))
exitCode = 1
return
}
hs := httpserver.New(ctx, cancel, svcName, httpServerConfig, api.MakeHandler(cfg.InstanceID), logger)
if cfg.SendTelemetry {
chc := chclient.New(svcName, magistrala.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("LoRa adapter terminated: %s", err))
}
}
func connectToMQTTBroker(burl, user, password string, timeout time.Duration, logger *slog.Logger) (mqttpaho.Client, error) {
opts := mqttpaho.NewClientOptions()
opts.AddBroker(burl)
opts.SetUsername(user)
opts.SetPassword(password)
opts.SetOnConnectHandler(func(_ mqttpaho.Client) {
logger.Info("Connected to Lora MQTT broker")
})
opts.SetConnectionLostHandler(func(_ mqttpaho.Client, err error) {
logger.Error(fmt.Sprintf("MQTT connection lost: %s", err))
})
client := mqttpaho.NewClient(opts)
if token := client.Connect(); token.WaitTimeout(timeout) && token.Error() != nil {
return nil, fmt.Errorf("failed to connect to Lora MQTT broker: %s", token.Error())
}
return client, nil
}
func subscribeToLoRaBroker(svc lora.Service, mc mqttpaho.Client, timeout time.Duration, topic string, logger *slog.Logger) error {
mqttBroker := mqtt.NewBroker(svc, mc, timeout, logger)
logger.Info("Subscribed to Lora MQTT broker")
if err := mqttBroker.Subscribe(topic); err != nil {
return fmt.Errorf("failed to subscribe to Lora MQTT broker: %s", err)
}
return nil
}
func subscribeToThingsES(ctx context.Context, svc lora.Service, cfg config, logger *slog.Logger) error {
subscriber, err := store.NewSubscriber(ctx, cfg.ESURL, thingsStream, cfg.ESConsumerName, logger)
if err != nil {
return err
}
handler := events.NewEventHandler(svc)
logger.Info("Subscribed to Redis Event Store")
return subscriber.Subscribe(ctx, handler)
}
func newRouteMapRepository(client *redis.Client, prefix string, logger *slog.Logger) lora.RouteMapRepository {
logger.Info(fmt.Sprintf("Connected to %s Redis Route-map", prefix))
return events.NewRouteMapRepository(client, prefix)
}
func newService(pub messaging.Publisher, rmConn *redis.Client, thingsRMPrefix, channelsRMPrefix, connsRMPrefix string, logger *slog.Logger) lora.Service {
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)
counter, latency := internal.MakeMetrics("lora_adapter", "api")
svc = api.MetricsMiddleware(svc, counter, latency)
return svc
}