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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"
)
type SwitchResult uint8
const (
SwitchOK SwitchResult = iota
SwitchError
)
type SwitchResponse struct {
Result SwitchResult
Message string
}
type SwitchCommand struct {
Cmd string
Response chan<- SwitchResponse
}
type SwitchUpdateType uint8
const (
SwitchStatus SwitchUpdateType = iota
SwitchGPI
SwitchOC
SwitchRelay
SwitchSilence
)
type SwitchUpdate struct {
Type SwitchUpdateType
Data string
}
type AudioSwitch struct {
port *SerialPort
timeout time.Duration
current *SwitchCommand
timer *time.Timer
Commands chan *SwitchCommand
Updates chan SwitchUpdate
}
func (sw *AudioSwitch) handleData(data string) {
if len(data) < 3 {
rhl.Printf("Audioswitch: ignoring short line")
return
}
rhdl.Printf("Audioswitch: got data: %q", data)
switch data[0:3] {
case "RRR":
fallthrough
case "EEE":
if sw.current != nil {
resp := SwitchResponse{Message: data}
resp.Result = SwitchError
if data[0] == 'R' {
resp.Result = SwitchOK
}
sw.current.Response <- resp
sw.current = nil
sw.timer.Stop()
sw.timer = nil
} else {
rhl.Printf("Audioswitch: ignoring unexpected response: %q", data)
}
case "S0L":
sw.Updates <- SwitchUpdate{SwitchStatus, data}
case "S0P":
sw.Updates <- SwitchUpdate{SwitchGPI, data}
case "S0O":
sw.Updates <- SwitchUpdate{SwitchOC, data}
case "S0R":
sw.Updates <- SwitchUpdate{SwitchRelay, data}
case "S0S":
sw.Updates <- SwitchUpdate{SwitchSilence, data}
default:
rhl.Printf("Audioswitch: ignoring invalid data: %q", data)
}
}
func (sw *AudioSwitch) Run() {
stop := make(chan bool)
sw.port.Run(stop)
sw.current = nil
sw.timer = nil
rhdl.Printf("Audioswitch: handler running...")
for {
if sw.current != nil {
select {
case <-stop:
return
case <-sw.timer.C:
resp := SwitchResponse{SwitchError, "EEE timeout"}
sw.current.Response <- resp
sw.current = nil
sw.timer = nil
case data := <-sw.port.rx:
sw.handleData(data)
}
} else {
select {
case <-stop:
return
case cmd := <-sw.Commands:
sw.current = cmd
sw.port.tx <- cmd.Cmd
sw.timer = time.NewTimer(sw.timeout)
case data := <-sw.port.rx:
sw.handleData(data)
}
}
}
}
func SwitchInit(conf *Config) (sw *AudioSwitch, err error) {
sw = &AudioSwitch{}
sw.timeout = time.Second
if conf.Audioswitch.Timeout.Duration > 0 {
sw.timeout = conf.Audioswitch.Timeout.Duration
}
sw.Commands = make(chan *SwitchCommand, 8)
sw.Updates = make(chan SwitchUpdate, 32)
if sw.port, err = SerialOpen(conf.Audioswitch.Device, conf.Audioswitch.Baudrate, ""); err != nil {
err = fmt.Errorf("Audioswitch: error opening serial port: %s", err)
return
}
return
}
|
