From e9ebe0a8ed3416938e4a703750628bc57951dc74 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Sat, 24 Sep 2016 13:58:34 +0200
Subject: cleanup some hardcoded values (still not done), added ticker to
 update states if the go stale


diff --git a/src/rhctl/switch_control.go b/src/rhctl/switch_control.go
index 66a41bf..cd66161 100644
--- a/src/rhctl/switch_control.go
+++ b/src/rhctl/switch_control.go
@@ -87,12 +87,17 @@ type Command struct {
 }
 
 type SwitchControl struct {
-	sw       *AudioSwitch
-	servers  []*PlayoutServer
-	state    State
-	settling *time.Timer
-	Updates  *pubsub.PubSub
-	Commands chan *Command
+	sw                       *AudioSwitch
+	servers                  []*PlayoutServer
+	state                    State
+	settling                 *time.Timer
+	Updates                  *pubsub.PubSub
+	Commands                 chan *Command
+	AwakeningSettlingTime    time.Duration // 30 * time.Second
+	SelectServerSettlingTime time.Duration // 10 * time.Second
+	UpdateStatesSettlingTime time.Duration //  3 * time.Second
+	StaleStateCheckInterval  time.Duration //  1 * time.Minute
+	StatesMaxAge             time.Duration //  2 * time.Hour
 }
 
 func (ctrl *SwitchControl) handleCommand(cmd *Command) {
@@ -142,29 +147,36 @@ func handleServer(sin <-chan ServerState, sout chan<- ServerState, cin <-chan Co
 	}
 }
 
-func (ctrl *SwitchControl) checkMissingOrStaleStates(maxAge time.Duration) {
+func (ctrl *SwitchControl) checkMissingOrStaleStates(maxAge time.Duration) (isStale bool) {
 	if time.Since(ctrl.state.Switch.AudioInputsChanged) > maxAge {
 		ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateAudio, nil, nil}
+		isStale = true
 	}
 	if time.Since(ctrl.state.Switch.AudioSilenceChanged) > maxAge {
 		ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateSilence, nil, nil}
+		isStale = true
 	}
 	if time.Since(ctrl.state.Switch.GPIChanged) > maxAge {
 		ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateGPIAll, nil, nil}
+		isStale = true
 	}
 	if time.Since(ctrl.state.Switch.RelayChanged) > maxAge {
 		ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateRelay, nil, nil}
+		isStale = true
 	}
 	if time.Since(ctrl.state.Switch.OCChanged) > maxAge {
 		ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateOC, nil, nil}
+		isStale = true
 	}
 
 	for _, server := range ctrl.servers {
 		s, exists := ctrl.state.Server[server.name]
 		if !exists || time.Since(s.Changed) > maxAge {
 			server.UpdateRequest <- true
+			isStale = true
 		}
 	}
+	return
 }
 
 func (ctrl *SwitchControl) getSwitchServerAssignment() (swsrv, swch string, err error) {
@@ -196,7 +208,7 @@ func (ctrl *SwitchControl) selectServer(server string) bool {
 		}
 	}
 	ctrl.sw.Commands <- &SwitchCommand{SwitchCmdAudioFadeUpInput, []interface{}{newIn}, nil}
-	ctrl.settling.Reset(10 * time.Second) // TODO: hardcoded value
+	ctrl.settling.Reset(ctrl.SelectServerSettlingTime)
 	ctrl.state.Settled = false
 	return true
 }
@@ -309,7 +321,7 @@ func (ctrl *SwitchControl) reconcile(requestedServer string) (result bool) {
 func (ctrl *SwitchControl) Run() {
 	rhl.Printf("SwitchCTRL: starting up -> now in mood: %s", ctrl.state.Mood)
 
-	ctrl.settling = time.NewTimer(30 * time.Second) // TODO: hardcode value
+	ctrl.settling = time.NewTimer(ctrl.AwakeningSettlingTime)
 	ctrl.state.Settled = false
 
 	serverStateChanges := make(chan ServerState, 8)
@@ -318,11 +330,19 @@ func (ctrl *SwitchControl) Run() {
 	}
 
 	// send out commands to switch and/or server to get missing infos
-	ctrl.checkMissingOrStaleStates(2 * time.Hour) // TODO: hardcoded value
+	ctrl.checkMissingOrStaleStates(0)
+	staleTicker := time.NewTicker(ctrl.StaleStateCheckInterval)
 
 	ctrl.reconcile("")
 	for {
 		select {
+		case <-staleTicker.C:
+			if ctrl.state.Settled { // better don't interfere with changes in progress
+				if ctrl.checkMissingOrStaleStates(ctrl.StatesMaxAge) {
+					ctrl.settling.Reset(ctrl.UpdateStatesSettlingTime)
+					ctrl.state.Settled = false
+				}
+			}
 		case <-ctrl.settling.C:
 			ctrl.state.Settled = true
 			ctrl.reconcile("")
@@ -359,5 +379,12 @@ func SwitchControlInit(conf *Config, sw *AudioSwitch, servers []*PlayoutServer)
 	ctrl.state.Server = make(map[string]ServerState)
 	ctrl.Updates = pubsub.NewNonBlocking(32)
 	ctrl.Commands = make(chan *Command, 8)
+
+	// TODO: get this from conf
+	ctrl.AwakeningSettlingTime = 30 * time.Second
+	ctrl.SelectServerSettlingTime = 10 * time.Second
+	ctrl.UpdateStatesSettlingTime = 3 * time.Second
+	ctrl.StaleStateCheckInterval = 1 * time.Minute
+	ctrl.StatesMaxAge = 2 * time.Hour
 	return
 }
-- 
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