From a8345a1ac7105a4393ab189e45c5ef0aead7577e Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Wed, 30 Mar 2016 02:06:52 +0200
Subject: add support for listening to status messages


diff --git a/Makefile b/Makefile
index 34a8e2e..c394c02 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,7 @@ EXECUTEABLE := rhctl
 
 LIBS := "github.com/schleibinger/sio" \
         "github.com/naoina/toml" \
+        "github.com/olebedev/emitter" \
         "github.com/spreadspace/telgo"
 
 .PHONY: getlibs updatelibs vet format build clean distclean
diff --git a/src/rhctl/audio_switch.go b/src/rhctl/audio_switch.go
index 4f1ef31..764a231 100644
--- a/src/rhctl/audio_switch.go
+++ b/src/rhctl/audio_switch.go
@@ -33,6 +33,16 @@ const (
 	SwitchError
 )
 
+func (c SwitchResult) String() string {
+	switch c {
+	case SwitchOK:
+		return "OK"
+	case SwitchError:
+		return "error"
+	}
+	return "unknown"
+}
+
 type SwitchResponse struct {
 	Result  SwitchResult
 	Message string
@@ -46,13 +56,29 @@ type SwitchCommand struct {
 type SwitchUpdateType uint8
 
 const (
-	SwitchStatus SwitchUpdateType = iota
+	SwitchAudio SwitchUpdateType = iota
 	SwitchGPI
 	SwitchOC
 	SwitchRelay
 	SwitchSilence
 )
 
+func (c SwitchUpdateType) String() string {
+	switch c {
+	case SwitchAudio:
+		return "audio"
+	case SwitchGPI:
+		return "gpi"
+	case SwitchOC:
+		return "oc"
+	case SwitchRelay:
+		return "relay"
+	case SwitchSilence:
+		return "silence"
+	}
+	return "unknown"
+}
+
 type SwitchUpdate struct {
 	Type SwitchUpdateType
 	Data string
@@ -92,7 +118,7 @@ func (sw *AudioSwitch) handleData(data string) {
 			rhl.Printf("Audioswitch: ignoring unexpected response: %q", data)
 		}
 	case "S0L":
-		sw.Updates <- SwitchUpdate{SwitchStatus, data}
+		sw.Updates <- SwitchUpdate{SwitchAudio, data}
 	case "S0P":
 		sw.Updates <- SwitchUpdate{SwitchGPI, data}
 	case "S0O":
diff --git a/src/rhctl/switch_control.go b/src/rhctl/switch_control.go
index b48ac07..82faec8 100644
--- a/src/rhctl/switch_control.go
+++ b/src/rhctl/switch_control.go
@@ -21,11 +21,14 @@
 
 package main
 
+import (
+	"github.com/olebedev/emitter"
+)
+
 type CommandType uint8
 
 const (
 	CmdStatus CommandType = iota
-	CmdListen
 	CmdServer
 	CmdSwitch
 )
@@ -34,8 +37,6 @@ func (c CommandType) String() string {
 	switch c {
 	case CmdStatus:
 		return "status"
-	case CmdListen:
-		return "listen"
 	case CmdServer:
 		return "server"
 	case CmdSwitch:
@@ -52,6 +53,7 @@ type Command struct {
 type SwitchControl struct {
 	sw       *AudioSwitch
 	servers  []*PlayoutServer
+	Updates  *emitter.Emitter
 	Commands chan *Command
 }
 
@@ -59,7 +61,6 @@ func (ctrl *SwitchControl) handleCommand(cmd *Command) {
 	rhdl.Printf("Telnet: got command: %+v", cmd)
 	switch cmd.Type {
 	case CmdStatus:
-	case CmdListen:
 	case CmdServer:
 	case CmdSwitch:
 	}
@@ -87,9 +88,10 @@ func (ctrl *SwitchControl) Run() {
 			for _, srv := range ctrl.servers {
 				srv.SwitchUpdates <- update
 			}
-			// TODO: send out to all clients who are interested in this
+			ctrl.Updates.Emit("switch:"+update.Type.String(), update)
 		case status := <-serverUpdates:
 			rhdl.Printf("got server status update: %+v", status)
+			ctrl.Updates.Emit("server:status", status)
 			// TODO: recalculate overall status and send out commands to switch
 		case cmd := <-ctrl.Commands:
 			ctrl.handleCommand(cmd)
@@ -101,6 +103,7 @@ func SwitchControlInit(conf *Config, sw *AudioSwitch, servers []*PlayoutServer)
 	ctrl = &SwitchControl{}
 	ctrl.sw = sw
 	ctrl.servers = servers
+	ctrl.Updates = emitter.New(32)
 	ctrl.Commands = make(chan *Command, 8)
 	return
 }
diff --git a/src/rhctl/telnet.go b/src/rhctl/telnet.go
index 8d73846..a07a820 100644
--- a/src/rhctl/telnet.go
+++ b/src/rhctl/telnet.go
@@ -22,6 +22,7 @@
 package main
 
 import (
+	"github.com/olebedev/emitter"
 	"github.com/spreadspace/telgo"
 )
 
@@ -35,9 +36,44 @@ func telnetStatus(c *telgo.Client, args []string, ctrl *SwitchControl) bool {
 	return false
 }
 
+func telnetListener(c *telgo.Client, ch <-chan emitter.Event) {
+	rhdl.Println("started telnetListener goroutine")
+	for {
+		event, ok := <-ch
+		if !ok {
+			return
+		}
+		c.Sayln("got event: %+v", event) // we need a way to find out that the client has stopped working
+	}
+	rhdl.Println("stopped telnetListener goroutine")
+}
+
 func telnetListen(c *telgo.Client, args []string, ctrl *SwitchControl) bool {
-	ctrl.Commands <- &Command{Type: CmdListen}
-	// TODO: implement this
+	var ch <-chan emitter.Event
+	if len(args) <= 1 {
+		ch = ctrl.Updates.On("*")
+	} else {
+		switch args[1] {
+		case "status":
+			ch = ctrl.Updates.On("status")
+		case "server":
+			ch = ctrl.Updates.On("server:status")
+		case "audio":
+			fallthrough
+		case "gpi":
+			fallthrough
+		case "oc":
+			fallthrough
+		case "relay":
+			fallthrough
+		case "silence":
+			ch = ctrl.Updates.On("switch:" + args[1])
+		default:
+			c.Sayln("unknown message type")
+			return false
+		}
+	}
+	go telnetListener(c, ch)
 	return false
 }
 
@@ -72,7 +108,9 @@ func telnetHelp(c *telgo.Client, args []string) bool {
 		case "listen":
 			c.Sayln("usage: listen [ <type> ]")
 			c.Sayln("   subscribe to messages of type <type>. The following types are allowed:")
-			c.Sayln("    - status    audio input/output mapping changes")
+			c.Sayln("    - status    overall status changes")
+			c.Sayln("    - server    status/health of the playout server")
+			c.Sayln("    - audio     audio input/output mapping changes")
 			c.Sayln("    - gpi       general purpose input status messages")
 			c.Sayln("    - oc        open-collector status messages")
 			c.Sayln("    - relay     relay status messages")
-- 
cgit v0.10.2