cmd/revid-cli: made general changes to make revi-cli more robust i.e. not so trigger happy with fatals

cmd/revid-cli/main.go

@@ -45,14 +45,6 @@ import (
 	"bitbucket.org/ausocean/utils/logger"
 )
 
-const (
-	// progName is the program name for logging purposes.
-	progName = "revid-cli"
-
-	// Logging is set to INFO level.
-	defaultLogVerbosity = logger.Info
-)
-
 // Revid modes
 const (
 	normal = "Normal"
@@ -67,12 +59,14 @@ const (
 	revidStopTime       = 5 * time.Second
 	defaultLogPath      = "/var/log/netsender"
 	pkg                 = "revid-cli:"
+	defaultLogVerbosity = logger.Info
+	defaultSleepTime    = 60 // Seconds
 )
 
 // canProfile is set to false with revid-cli is built with "-tags profile".
 var canProfile = true
 
-// The logger that will be used throughout
+// The logger that will be used throughout.
 var log *logger.Logger
 
 const (
@@ -265,16 +259,17 @@ func handleFlags() revid.Config {
 }
 
 // initialize then run the main NetSender client
-func run(cfg revid.Config) error {
+func run(cfg revid.Config) {
 	log.Log(logger.Info, pkg+"running in NetSender mode")
 
-	var vars map[string]string
-
 	var rv *revid.Revid
 
 	readPin := func(pin *netsender.Pin) error {
 		switch {
 		case pin.Name == "X23":
+			if rv == nil {
+				pin.Value = 0
+			}
 			pin.Value = rv.Bitrate()
 		case pin.Name[0] == 'X':
 			return sds.ReadSystem(pin)
@@ -286,35 +281,10 @@ func run(cfg revid.Config) error {
 
 	ns, err := netsender.New(log, nil, readPin, nil)
 	if err != nil {
-		return err
+		log.Log(logger.Fatal, pkg+"could not initialise netsender client")
-	}
-
-	rv, err = revid.New(cfg, ns)
-	if err != nil {
-		log.Log(logger.Fatal, pkg+"could not initialise revid", "error", err.Error())
-	}
-
-	vars, _ = ns.Vars()
-	vs := ns.VarSum()
-
-	// Update revid to get latest config settings from netreceiver.
-	err = rv.Update(vars)
-	if err != nil {
-		return err
-	}
-
-	// If mode on netreceiver isn't paused then we can start revid.
-	if ns.Mode() != paused && ns.Mode() != burst {
-		err = rv.Start()
-		if err != nil {
-			return err
-		}
-	}
-
-	if ns.Mode() == burst {
-		ns.SetMode(paused, &vs)
 	}
 
+	var vs int
 	for {
 		err = ns.Run()
 		if err != nil {
@@ -323,10 +293,13 @@ func run(cfg revid.Config) error {
 			continue
 		}
 
-		// If var sum hasn't change we continue
+		// If var sum hasn't changed we continue.
-		if vs == ns.VarSum() {
+		var vars map[string]string
+		newVs := ns.VarSum()
+		if vs == newVs {
 			goto sleep
 		}
+		vs = newVs
 
 		vars, err = ns.Vars()
 		if err != nil {
@@ -334,35 +307,52 @@ func run(cfg revid.Config) error {
 			time.Sleep(netSendRetryTime)
 			continue
 		}
-		vs = ns.VarSum()
+
+		if rv == nil {
+			rv, err = revid.New(cfg, ns)
+			if err != nil {
+				log.Log(logger.Error, pkg+"could not initialise revid", "error", err.Error())
+				goto sleep
+			}
+		}
 
 		err = rv.Update(vars)
 		if err != nil {
-			return err
+			log.Log(logger.Error, pkg+"Couldn't update revid", "error", err.Error())
+			goto sleep
 		}
 
 		switch ns.Mode() {
 		case paused:
+			rv.Stop()
 		case normal:
 			err = rv.Start()
 			if err != nil {
-				return err
+				log.Log(logger.Error, pkg+"could not start revid", "error", err.Error())
+				ns.SetMode(paused, &vs)
+				goto sleep
 			}
 		case burst:
 			log.Log(logger.Info, pkg+"Starting burst...")
+
 			err = rv.Start()
 			if err != nil {
-				return err
+				log.Log(logger.Error, pkg+"could not start burst", "error", err.Error())
+				ns.SetMode(paused, &vs)
+				goto sleep
 			}
+
 			time.Sleep(time.Duration(rv.Config().BurstPeriod) * time.Second)
 			log.Log(logger.Info, pkg+"Stopping burst...")
 			rv.Stop()
 			ns.SetMode(paused, &vs)
 		}
+
 	sleep:
 		sleepTime, err := strconv.Atoi(ns.Param("mp"))
 		if err != nil {
-			return err
+			log.Log(logger.Error, pkg+"could not get sleep time, using default")
+			sleepTime = defaultSleepTime
 		}
 		time.Sleep(time.Duration(sleepTime) * time.Second)
 	}