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|
//
// dolmetschctl
//
//
// Copyright (C) 2019 Christian Pointner <equinox@spreadspace.org>
//
// This file is part of dolmetschctl.
//
// dolmetschctl 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.
//
// dolmetschctl 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 dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"time"
"github.com/gorilla/websocket"
"spreadspace.org/dolmetschctl/pkg/controller"
"spreadspace.org/dolmetschctl/pkg/types"
)
const (
blinkTime = 20
lang1 = "en"
lang2 = "de"
)
func wsReader(ws *websocket.Conn, ch chan<- types.WebSocketResponseFull) {
defer close(ch)
for {
t, r, err := ws.NextReader()
if err != nil {
log.Println("websocket disconnected:", err)
return
}
switch t {
case websocket.TextMessage:
var msg types.WebSocketResponseFull
dec := json.NewDecoder(r)
dec.DisallowUnknownFields()
if err := dec.Decode(&msg); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
log.Println("webclient response parse error:", err)
return
}
ch <- msg
case websocket.BinaryMessage:
io.Copy(ioutil.Discard, r) // consume all the data
}
}
}
func handleControllerEvent(ctrl *controller.Controller, ws *websocket.Conn, ev controller.Event) error {
if ev.Type != controller.ButtonPressed {
return nil
}
lang := ""
switch ev.Button {
case 0:
lang = "en"
case 1:
lang = "de"
default:
lang = "none"
}
return ws.WriteJSON(types.WebSocketRequest{Command: "language", Args: []string{lang}})
}
func ledOnOrBlink(ctrl *controller.Controller, num uint8, state types.State) {
if state == types.StateSettled {
ctrl.LedOn(num)
} else {
ctrl.LedBlink(num, blinkTime)
}
}
func handleWebSocketMessage(ctrl *controller.Controller, ws *websocket.Conn, msg types.WebSocketResponseFull) error {
if msg.Type == "state" {
switch msg.Lang {
case lang1:
ledOnOrBlink(ctrl, 0, msg.State)
ctrl.LedOff(1)
ctrl.LedOff(2)
ctrl.LedOff(3)
case lang2:
ctrl.LedOff(0)
ledOnOrBlink(ctrl, 1, msg.State)
ctrl.LedOff(2)
ctrl.LedOff(3)
default:
ctrl.LedOff(0)
ctrl.LedOff(1)
ledOnOrBlink(ctrl, 2, msg.State)
ledOnOrBlink(ctrl, 3, msg.State)
}
}
return nil
}
func run(ctrl *controller.Controller, ws *websocket.Conn) (error, bool) {
ctrlCh := make(chan controller.Event, 100)
unsub := ctrl.Subscribe(ctrlCh)
defer close(unsub)
wsCh := make(chan types.WebSocketResponseFull)
go wsReader(ws, wsCh)
if err := ws.WriteJSON(types.WebSocketRequest{Command: "subscribe"}); err != nil {
return err, true
}
log.Printf("subscribed to state changes!")
for {
select {
case ev, ok := <-ctrlCh:
if !ok {
return fmt.Errorf("controller channel was closed."), false
}
if err := handleControllerEvent(ctrl, ws, ev); err != nil {
return err, true
}
case msg, ok := <-wsCh:
if !ok {
return fmt.Errorf("websocket channel was closed."), true
}
if err := handleWebSocketMessage(ctrl, ws, msg); err != nil {
return err, true
}
}
}
}
func main() {
log.Println("hello world.")
c, err := controller.NewController(controller.Config{Dev: "dolmetsch controller"})
if err != nil {
log.Printf("Error opening the controller: %v", err)
os.Exit(1)
}
defer c.Shutdown()
if err = c.Init(); err != nil {
log.Printf("Error initializeing the controller: %v", err)
os.Exit(1)
}
log.Printf("controller successfully initialized!")
for {
ws, _, err := websocket.DefaultDialer.Dial("ws://127.0.0.1:8234/api/v1/socket", nil)
if err != nil {
log.Printf("Error connecting to daemon: %v", err)
} else {
log.Printf("successfully conncted!")
err, restart := run(c, ws)
if restart {
log.Printf("run() returned temporary error: %v", err)
} else {
log.Printf("run() returned fatal error: %v", err)
break
}
}
log.Printf("will retry in one second...")
time.Sleep(time.Second)
}
log.Printf("exiting.")
}
|
