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//
// rhctl
//
// Copyright (C) 2009-2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhctl.
//
// rhctl is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhctl is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhctl. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"fmt"
"time"
"github.com/btittelbach/pubsub"
)
type Mood uint
const (
MoodAwakening Mood = iota
MoodSad
MoodNervous
MoodHappy
)
func (m Mood) String() string {
switch m {
case MoodAwakening:
return "awakening"
case MoodSad:
return "sad"
case MoodNervous:
return "nervous"
case MoodHappy:
return "happy"
}
return "unknown"
}
type State struct {
Mood Mood
Switch SwitchState
ActiveServer string
Server map[string]ServerState
}
type CommandType uint8
const (
CmdState CommandType = iota
CmdServer
CmdSwitch
)
func (c CommandType) String() string {
switch c {
case CmdState:
return "state"
case CmdServer:
return "server"
case CmdSwitch:
return "switch"
}
return "unknown"
}
type Command struct {
Type CommandType
Args []string
Response chan<- interface{}
}
type SwitchControl struct {
sw *AudioSwitch
servers []*PlayoutServer
state State
startup time.Time
Updates *pubsub.PubSub
Commands chan *Command
}
func (ctrl *SwitchControl) handleCommand(cmd *Command) {
switch cmd.Type {
case CmdState:
cmd.Response <- ctrl.state
case CmdServer:
if len(cmd.Args) == 0 {
cmd.Response <- fmt.Errorf("no server specified")
return
}
cmd.Response <- ctrl.reconcile(cmd.Args[0])
case CmdSwitch:
if len(cmd.Args) == 0 {
cmd.Response <- fmt.Errorf("no command specified")
return
}
c, err := NewSwitchCommandFromStrings(cmd.Args[0], cmd.Args[1:]...)
if err != nil {
cmd.Response <- fmt.Errorf("switch command syntax error: %s", err.Error())
return
}
c.Response = cmd.Response
ctrl.sw.Commands <- c
}
}
func handleServer(in <-chan ServerState, out chan<- ServerState) {
for {
update := <-in
out <- update
}
}
func (ctrl *SwitchControl) checkMissingOrStaleStates(maxAge time.Duration) {
if time.Since(ctrl.state.Switch.AudioInputsChanged) > maxAge {
ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateAudio, nil, nil}
}
if time.Since(ctrl.state.Switch.AudioSilenceChanged) > maxAge {
ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateSilence, nil, nil}
}
if time.Since(ctrl.state.Switch.GPIChanged) > maxAge {
ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateGPIAll, nil, nil}
}
if time.Since(ctrl.state.Switch.RelayChanged) > maxAge {
ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateRelay, nil, nil}
}
if time.Since(ctrl.state.Switch.OCChanged) > maxAge {
ctrl.sw.Commands <- &SwitchCommand{SwitchCmdStateOC, nil, nil}
}
for _, server := range ctrl.servers {
s, exists := ctrl.state.Server[server.name]
if !exists || time.Since(s.Changed) > maxAge {
server.UpdateRequest <- true
}
}
}
func (ctrl *SwitchControl) reconcile(requestedServer string) (result bool) {
rhdl.Printf("SwitchCTRL: reconciling state... (requested server: '%s')", requestedServer)
// send out commands to switch and/or server to get missing infos
ctrl.checkMissingOrStaleStates(2 * time.Hour) // TODO: hardcoded value
if ctrl.state.Mood == MoodAwakening && time.Since(ctrl.startup) < (time.Minute) { // TODO: hardcoded value
// it's to early to take actions - let's learn i little bit more about current state
return
}
// TODO: change active server if it fails or on request
// return true if requested server got selected
// TODO: change switch output mappings if servers change channels or fail
// TODO: set mood dependent on overall-state
return
}
func (ctrl *SwitchControl) Run() {
rhdl.Printf("SwitchCTRL: handler running...")
ctrl.startup = time.Now()
serverStateChanges := make(chan ServerState, 8)
for _, srv := range ctrl.servers {
go handleServer(srv.StateChanges, serverStateChanges)
}
ctrl.reconcile("")
for {
select {
case update := <-ctrl.sw.Updates:
rhdl.Printf("got update from switch: %+v", update)
for _, srv := range ctrl.servers {
srv.SwitchUpdates <- update
}
ctrl.Updates.Pub(update, "switch:"+update.Type.String())
case state := <-ctrl.sw.StateChanges:
// rhdl.Printf("got switch state update: %+v", state)
ctrl.Updates.Pub(state, "switch:state")
ctrl.state.Switch = state
ctrl.reconcile("")
ctrl.Updates.Pub(ctrl.state, "state")
case state := <-serverStateChanges:
rhdl.Printf("got server state update: %+v", state)
ctrl.Updates.Pub(state, "server:state")
ctrl.state.Server[state.Name] = state
ctrl.reconcile("")
ctrl.Updates.Pub(ctrl.state, "state")
case cmd := <-ctrl.Commands:
ctrl.handleCommand(cmd)
}
}
}
func SwitchControlInit(conf *Config, sw *AudioSwitch, servers []*PlayoutServer) (ctrl *SwitchControl) {
ctrl = &SwitchControl{}
ctrl.sw = sw
ctrl.servers = servers
ctrl.state.Mood = MoodAwakening
ctrl.state.Server = make(map[string]ServerState)
ctrl.Updates = pubsub.NewNonBlocking(32)
ctrl.Commands = make(chan *Command, 8)
return
}
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