Naive implementation that always return min value

cmd/rc-throttle/rc-throttle.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"flag"
+	"github.com/cyrilix/robocar-base/cli"
+	"github.com/cyrilix/robocar-base/mqttdevice"
+	"github.com/cyrilix/robocar-throttle/part"
+	"log"
+	"os"
+)
+
+const (
+	DefaultClientId = "robocar-throttle"
+	DefaultThrottleMin = 0.3
+)
+
+func main() {
+	var mqttBroker, username, password, clientId string
+	var throttleTopic string
+	var minThrottle, maxThrottle float64
+
+	err := cli.SetFloat64DefaultValueFromEnv(&minThrottle, "THROTTLE_MIN", DefaultThrottleMin)
+	if err != nil {
+		log.Printf("unable to parse min throttle value arg: %v", err)
+	}
+	err = cli.SetFloat64DefaultValueFromEnv(&maxThrottle, "THROTTLE_MAX", minThrottle)
+	if err != nil {
+		log.Printf("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.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")
+
+	flag.Parse()
+	if len(os.Args) <= 1 {
+		flag.PrintDefaults()
+		os.Exit(1)
+	}
+
+	client, err := cli.Connect(mqttBroker, username, password, clientId)
+	if err != nil {
+		log.Fatalf("unable to connect to mqtt bus: %v", err)
+	}
+	defer client.Disconnect(50)
+
+	pub := mqttdevice.NewPahoMqttPubSub(mqttBroker, username, password,clientId,mqttQos, mqttRetain)
+
+	p := part.NewPart(pub, throttleTopic, minThrottle, maxThrottle)
+	defer p.Stop()
+
+	cli.HandleExit(p)
+
+	err = p.Start()
+	if err != nil {
+		log.Fatalf("unable to start service: %v", err)
+	}
+}