forked from gitter-badger/mainflux
/
main.go
83 lines (64 loc) · 1.44 KB
/
main.go
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package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"github.com/mainflux/mainflux/coap"
"github.com/mainflux/mainflux/coap/nats"
broker "github.com/nats-io/go-nats"
"go.uber.org/zap"
)
const (
port int = 5683
defNatsURL string = broker.DefaultURL
envNatsURL string = "COAP_ADAPTER_NATS_URL"
)
type config struct {
Port int
NatsURL string
}
func main() {
cfg := loadConfig()
logger, _ := zap.NewProduction()
defer logger.Sync() // flushes buffer, if any
nc := connectToNats(cfg, logger)
defer nc.Close()
repo := nats.NewMessageRepository(nc)
ca := adapter.NewCoAPAdapter(logger, repo)
nc.Subscribe("msg.http", ca.BridgeHandler)
nc.Subscribe("msg.mqtt", ca.BridgeHandler)
errs := make(chan error, 2)
go func() {
coapAddr := fmt.Sprintf(":%d", cfg.Port)
errs <- ca.Serve(coapAddr)
}()
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT)
errs <- fmt.Errorf("%s", <-c)
}()
c := <-errs
logger.Info("terminated", zap.String("error", c.Error()))
}
func loadConfig() *config {
return &config{
NatsURL: env(envNatsURL, defNatsURL),
Port: port,
}
}
func env(key, fallback string) string {
value := os.Getenv(key)
if value == "" {
return fallback
}
return value
}
func connectToNats(cfg *config, logger *zap.Logger) *broker.Conn {
nc, err := broker.Connect(cfg.NatsURL)
if err != nil {
logger.Error("Failed to connect to NATS", zap.Error(err))
os.Exit(1)
}
return nc
}