robocar-throttle/cmd/rc-throttle/rc-throttle.go

package main

import (
	"flag"
	"github.com/cyrilix/robocar-base/cli"
	"github.com/cyrilix/robocar-throttle/pkg/throttle"
	"go.uber.org/zap"
	"log"
	"os"
)

const (
	DefaultClientId    = "robocar-throttle"
	DefaultThrottleMin = 0.3
)

func main() {
	var mqttBroker, username, password, clientId string
	var throttleTopic, driveModeTopic, rcThrottleTopic string
	var minThrottle, maxThrottle float64

	err := cli.SetFloat64DefaultValueFromEnv(&minThrottle, "THROTTLE_MIN", DefaultThrottleMin)
	if err != nil {
		zap.S().Errorf("unable to parse min throttle value arg: %v", err)
	}
	err = cli.SetFloat64DefaultValueFromEnv(&maxThrottle, "THROTTLE_MAX", minThrottle)
	if err != nil {
		zap.S().Errorf("unable to parse max throttle value arg: %v", err)
	}

	mqttQos := cli.InitIntFlag("MQTT_QOS", 0)
	_, mqttRetain := os.LookupEnv("MQTT_RETAIN")

	cli.InitMqttFlags(DefaultClientId, &mqttBroker, &username, &password, &clientId, &mqttQos, &mqttRetain)

	flag.StringVar(&throttleTopic, "mqtt-topic-throttle", os.Getenv("MQTT_TOPIC_THROTTLE"), "Mqtt topic to publish throttle result, use MQTT_TOPIC_THROTTLE if args not set")
	flag.StringVar(&driveModeTopic, "mqtt-topic-drive-mode", os.Getenv("MQTT_TOPIC_DRIVE_MODE"), "Mqtt topic that contains DriveMode value, use MQTT_TOPIC_DRIVE_MODE if args not set")
	flag.StringVar(&rcThrottleTopic, "mqtt-topic-rc-throttle", os.Getenv("MQTT_TOPIC_RC_THROTTLE"), "Mqtt topic that contains RC Throttle value, use MQTT_TOPIC_RC_THROTTLE if args not set")
	flag.Float64Var(&minThrottle, "throttle-min", minThrottle, "Minimum throttle value, use THROTTLE_MIN if args not set")
	flag.Float64Var(&maxThrottle, "throttle-max", maxThrottle, "Minimum throttle value, use THROTTLE_MAX if args not set")
	logLevel := zap.LevelFlag("log", zap.InfoLevel, "log level")

	flag.Parse()
	if len(os.Args) <= 1 {
		flag.PrintDefaults()
		os.Exit(1)
	}

	config := zap.NewDevelopmentConfig()
	config.Level = zap.NewAtomicLevelAt(*logLevel)
	lgr, err := config.Build()
	if err != nil {
		log.Fatalf("unable to init logger: %v", err)
	}
	defer func() {
		if err := lgr.Sync(); err != nil {
			log.Printf("unable to Sync logger: %v\n", err)
		}
	}()
	zap.ReplaceGlobals(lgr)

	client, err := cli.Connect(mqttBroker, username, password, clientId)
	if err != nil {
		zap.S().Fatalf("unable to connect to mqtt bus: %v", err)
	}
	defer client.Disconnect(50)

	p := throttle.New(client, throttleTopic, driveModeTopic, rcThrottleTopic, float32(minThrottle), float32(maxThrottle), 2)
	defer p.Stop()

	cli.HandleExit(p)

	err = p.Start()
	if err != nil {
		zap.S().Fatalf("unable to start service: %v", err)
	}
}