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serve.go
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serve.go
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package main
import (
"bufio"
"flag"
"fmt"
effects "github.com/Jon-Bright/ledctl/effects"
pixarray "github.com/Jon-Bright/ledctl/pixarray"
"io"
"log"
"net"
"os"
"strings"
"time"
)
var lpd8806Dev = flag.String("dev", "/dev/spidev0.0", "The SPI device on which LPD8806 LEDs are connected")
var lpd8806SpiSpeed = flag.Uint("spispeed", 1000000, "The speed to send data via SPI to LPD8806s, in Hz")
var ws281xFreq = flag.Uint("ws281xfreq", 800000, "The frequency to send data to WS2801x devices, in Hz")
var ws281xDma = flag.Int("ws281xdma", 10, "The DMA channel to use for sending data to WS281x devices")
var ws281xPin0 = flag.Int("ws281xpin0", 18, "The pin on which channel 0 should be output for WS281x devices")
var ws281xPin1 = flag.Int("ws281xpin1", 13, "The pin on which channel 1 should be output for WS281x devices")
var ledChip = flag.String("ledchip", "ws281x", "The type of LED strip to drive: one of ws281x, lpd8806")
var port = flag.Int("port", 24601, "The port that the server should listen to")
var pixels = flag.Int("pixels", 5*32, "The number of pixels to be controlled")
var pixelOrder = flag.String("order", "GRB", "The color ordering of the pixels")
type Server struct {
pa *pixarray.PixArray
l net.Listener
c chan effects.Effect
laste effects.Effect
off bool
running bool
}
func NewServer(port int, pa *pixarray.PixArray) (*Server, error) {
l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
return nil, err
}
c := make(chan effects.Effect)
log.Printf("Listening on port %d", port)
return &Server{pa, l, c, nil, true, false}, nil
}
func parseDuration(parms string) (string, time.Duration, error) {
t := strings.SplitN(parms, " ", 2)
d, err := time.ParseDuration(t[0] + "s")
if err != nil {
return "", 0, err
}
if len(t) == 1 {
return "", d, nil
}
return t[1], d, nil
}
func (s *Server) parseColor(parms string) (string, *pixarray.Pixel, error) {
t := strings.SplitN(parms, " ", 2)
var p pixarray.Pixel
n, err := fmt.Sscanf(t[0], "%02X%02X%02X%02X", &p.R, &p.G, &p.B, &p.W)
if err != nil && err != io.EOF {
return "", nil, err
}
if n != s.pa.NumColors() {
return "", nil, fmt.Errorf("only %d tokens parsed from '%s', wanted %d", n, t[0], s.pa.NumColors())
}
max := s.pa.MaxPerChannel()
if p.R > max || p.G > max || p.B > max || p.W > max {
return "", nil, fmt.Errorf("invalid color: one or more of %d, %d, %d, %d is >%d, parsed from %s", p.R, p.G, p.B, p.W, max, t[0])
}
if len(t) == 1 {
return "", &p, nil
}
return t[1], &p, nil
}
func (s *Server) createEffect(cmd, parms string, w *bufio.Writer) (effects.Effect, error) {
switch {
case cmd == "FADE_ALL":
parms, p, err := s.parseColor(parms)
if err != nil {
return nil, fmt.Errorf("error parsing color: %v", err)
}
_, d, err := parseDuration(parms)
if err != nil {
return nil, fmt.Errorf("error parsing duration: %v", err)
}
return effects.NewFade(d, *p), nil
case cmd == "ZIP_SET_ALL":
parms, p, err := s.parseColor(parms)
if err != nil {
return nil, fmt.Errorf("error parsing color: %v", err)
}
_, d, err := parseDuration(parms)
if err != nil {
return nil, fmt.Errorf("error parsing duration: %v", err)
}
return effects.NewZip(d, *p), nil
case cmd == "CYCLE":
_, d, err := parseDuration(parms)
if err != nil {
return nil, fmt.Errorf("error parsing duration: %v", err)
}
return effects.NewCycle(d), nil
case cmd == "RAINBOW":
_, d, err := parseDuration(parms)
if err != nil {
return nil, fmt.Errorf("error parsing duration: %v", err)
}
return effects.NewRainbow(d), nil
case cmd == "GET":
for _, p := range s.pa.GetPixels() {
if p.R != 0 || p.G != 0 || p.B != 0 {
w.WriteString("1\n")
err := w.Flush()
return nil, err
}
}
w.WriteString("0\n")
err := w.Flush()
return nil, err
case cmd == "COLOUR" || cmd == "COLOR":
p := s.pa.GetPixels()[0]
c := p.String() + "\n"
log.Printf("Returning %s", c)
w.WriteString(c)
err := w.Flush()
return nil, err
case cmd == "MODE":
n := "CONST"
if s.off {
n = "OFF"
} else if s.running {
if s.laste == nil {
return nil, fmt.Errorf("s running, but laste nil!")
}
n = s.laste.Name()
}
log.Printf("Mode '%s'", n)
if parms == "" {
log.Printf("Returning %s", n)
w.WriteString(n + "\n")
err := w.Flush()
return nil, err
}
r := "0\n"
if parms == n {
r = "1\n"
}
log.Printf("Returning %s", r)
w.WriteString(r)
err := w.Flush()
return nil, err
case cmd == "ON":
return s.laste, nil
case cmd == "OFF":
// Hack: we insert this directly into the channel because we don't want to overwrite whatever the last effect was
fb := effects.NewFade(20*time.Second, pixarray.Pixel{R: 0, G: 0, B: 0, W: 0})
s.off = true
s.c <- fb
return nil, nil
case cmd == "KNIGHTRIDER":
_, d, err := parseDuration(parms)
if err != nil {
return nil, fmt.Errorf("error parsing duration: %v", err)
}
return effects.NewKnightRider(d, s.pa.NumPixels()/4), nil
}
return nil, fmt.Errorf("unknown command: %s", cmd)
}
func (s *Server) runEffects() {
var laste, e effects.Effect
var d time.Duration
var steps int
var start time.Time
for {
if d == 0 {
e = <-s.c
} else {
select {
case e = <-s.c:
break
case <-time.After(d):
break
}
}
if e == nil {
log.Fatalf("Ready to process effect, but no effect!")
}
if e != laste {
err := powerOn(s.pa.RPi())
if err != nil {
log.Fatalf("Failed power-on: %v", err)
}
start = time.Now()
e.Start(s.pa, start)
s.running = true
steps = 0
}
d = e.NextStep(s.pa, time.Now())
steps++
s.pa.Write()
if d == 0 {
d := time.Since(start)
ps := time.Duration(d.Nanoseconds() / int64(steps))
log.Printf("Finished effect, %d steps, %s total, %s/step", steps, d, ps)
laste = nil
e = nil
s.running = false
p := s.pa.GetPixels()[0]
log.Printf("Seeing post-effect pix %v", p)
if p.R <= 0 && p.G <= 0 && p.B <= 0 && p.W <= 0 {
err := powerOff(s.pa.RPi())
if err != nil {
log.Fatalf("Failed power-off: %v", err)
}
}
} else {
laste = e
}
}
}
func (s *Server) handleConnection(c net.Conn) {
log.Printf("Handling connection from %v", c.RemoteAddr())
defer c.Close()
r := bufio.NewReader(c)
w := bufio.NewWriter(c)
for {
l, err := r.ReadString('\n')
if err == io.EOF {
log.Printf("EOF for connection %v", c.RemoteAddr())
return
}
if err != nil {
log.Printf("Error reading string for connection %v: %v", c.RemoteAddr(), err)
return
}
l = strings.TrimSpace(l)
log.Printf("Got line '%s'", l)
t := strings.SplitN(l, " ", 2)
cmd := strings.ToUpper(t[0])
parms := ""
if len(t) > 1 {
parms = t[1]
}
if cmd == "QUIT" {
return
}
e, err := s.createEffect(cmd, parms, w)
if err != nil {
es := fmt.Sprintf("Error creating effect: %v", err)
log.Print(es)
w.WriteString("ERR: " + es + "\n")
err = w.Flush()
if err != nil {
log.Printf("error writing error reply: %v", err)
}
return
}
if e != nil {
// Some commands don't result in a new Effect, e.g. status
// those commands write their own reply.
w.WriteString("OK\n")
err = w.Flush()
if err != nil {
log.Printf("error writing reply: %v", err)
}
s.c <- e
s.laste = e
s.off = false
}
}
}
func (s *Server) handleConnections() {
for {
conn, err := s.l.Accept()
if err != nil {
log.Printf("Error accepting connection: %v", err)
continue
}
go s.handleConnection(conn)
}
}
func main() {
flag.Parse()
order := pixarray.StringOrders[*pixelOrder]
var leds pixarray.LEDStrip
var err error
switch *ledChip {
case "lpd8806":
dev, err := os.OpenFile(*lpd8806Dev, os.O_RDWR, os.ModePerm)
if err != nil {
log.Fatalf("Failed opening SPI: %v", err)
}
leds, err = pixarray.NewLPD8806(dev, *pixels, 3, uint32(*lpd8806SpiSpeed), order)
if err != nil {
log.Fatalf("Failed creating LPD8806: %v", err)
}
case "ws281x":
leds, err = pixarray.NewWS281x(*pixels, 3, order, *ws281xFreq, *ws281xDma, []int{*ws281xPin0, *ws281xPin1})
if err != nil {
log.Fatalf("Failed creating WS281x: %v", err)
}
default:
log.Fatalf("Unrecognized LED type: %v", *ledChip)
}
pa := pixarray.NewPixArray(*pixels, 3, leds) // TODO: White
s, err := NewServer(*port, pa)
if err != nil {
log.Fatalf("Failed creating server: %v", err)
}
go s.runEffects()
s.handleConnections()
}