Created
March 20, 2017 08:41
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A websocket client in Go that connects to a unicorn display server - See http://www.actuino.fr/raspi/learn-go-pi.html
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package main | |
import ( | |
"github.com/graarh/golang-socketio" | |
"github.com/graarh/golang-socketio/transport" | |
"log" | |
"runtime" | |
"time" | |
"fmt" | |
"io/ioutil" | |
"encoding/json" | |
"os" | |
"strconv" | |
) | |
import . "github.com/alexellis/blinkt_go" | |
type colors map[string][3]int | |
type FileMessage struct { | |
Name string `json:"Name"` | |
Channel string `json:"Channel"` | |
Type string `json:"Type"` | |
Payload [8][8]int `json:"Payload"` | |
} | |
func main() { | |
brightness := 0.3 | |
display_server_host := "192.168.7.3" | |
if "" != os.Getenv("DISPLAY_SERVER_HOST") { | |
display_server_host = os.Getenv("DISPLAY_SERVER_HOST") | |
} | |
display_server_port := 80 | |
if "" != os.Getenv("DISPLAY_SERVER_PORT") { | |
port, err := strconv.Atoi(os.Getenv("DISPLAY_SERVER_PORT")) | |
if err == nil { | |
display_server_port = port | |
} | |
} | |
log.Println("--- Server: ", display_server_host, display_server_port) | |
blinkt := NewBlinkt(brightness) | |
blinkt.SetClearOnExit(true) | |
blinkt.Setup() | |
Delay(100) | |
runtime.GOMAXPROCS(runtime.NumCPU()) | |
dat, err := ioutil.ReadFile("./colors.json") | |
if err != nil { | |
fmt.Println(err.Error()) | |
os.Exit(1) | |
} | |
var palette colors | |
json.Unmarshal(dat, &palette) | |
c, err := gosocketio.Dial( | |
gosocketio.GetUrl(display_server_host, display_server_port, false), | |
transport.GetDefaultWebsocketTransport()) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = c.On("message", func(h *gosocketio.Channel, args string) { | |
log.Println("--- Got message: ", args) | |
}) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = c.On("file", func(h *gosocketio.Channel, args FileMessage) { | |
log.Println("--- Got json file: ", args) | |
blinkt.Clear() | |
for i, colorIndex := range args.Payload[0] { | |
rgb := palette[strconv.Itoa(colorIndex)]; | |
blinkt.SetPixel(i, rgb[0], rgb[1], rgb[2]) | |
blinkt.Show() | |
} | |
}) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = c.On(gosocketio.OnDisconnection, func(h *gosocketio.Channel) { | |
log.Fatal("Disconnected") | |
}) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = c.On(gosocketio.OnConnection, func(h *gosocketio.Channel) { | |
log.Println("Connected") | |
}) | |
if err != nil { | |
log.Fatal(err) | |
} | |
for { | |
time.Sleep(1 * time.Second) | |
} | |
c.Close() | |
log.Println(" [x] Complete") | |
} |
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