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package main | |
import ( | |
"github.com/gorilla/mux" | |
rpio "github.com/stianeikeland/go-rpio" | |
"log" | |
"net/http" | |
"os" | |
"os/signal" | |
"time" | |
) | |
const ( | |
gameTime = 4 | |
startBlinkDelay = 50 | |
) | |
func main() { | |
log.Print("Starting up...") | |
err := rpio.Open() | |
if err != nil { | |
panic(err) | |
} | |
defer func() { | |
log.Print("Cleaning up...") | |
rpio.Close() | |
}() | |
pin := rpio.Pin(10) | |
pin.Output() | |
defer func() { | |
log.Print("Setting pin 10 to low") | |
pin.Low() | |
}() | |
r := mux.NewRouter() | |
r.HandleFunc("/current", func(resp http.ResponseWriter, req *http.Request) { | |
defer pin.Output() | |
pin.Input() | |
state := pin.Read() | |
var output string | |
if state == rpio.Low { | |
output = "Low" | |
} else { | |
output = "High" | |
} | |
resp.Write([]byte(output)) | |
}). | |
Methods("GET") | |
saved := make(chan bool) | |
r.HandleFunc("/save", func(resp http.ResponseWriter, req *http.Request) { | |
saved <- true | |
}). | |
Methods("POST") | |
go func() { | |
log.Print("Starting web server") | |
http.ListenAndServe(":8080", r) | |
}() | |
resetBlinking, stopBlinking := blinker(pin) | |
timeout := time.After(gameTime * time.Second) | |
quit := make(chan bool, 1) | |
c := make(chan os.Signal, 1) | |
signal.Notify(c, os.Interrupt, os.Kill) | |
go func() { | |
<-c | |
quit <- true | |
}() | |
for { | |
select { | |
case <-saved: | |
log.Print("Saved by the bell") | |
timeout = time.After(gameTime * time.Second) | |
resetBlinking <- true | |
log.Printf("You got another %v seconds", gameTime) | |
case <-timeout: | |
log.Print("You couldnt save the LED") | |
quit <- true | |
case <-quit: | |
stoppedBlinking := make(chan bool) | |
stopBlinking <- stoppedBlinking | |
<-stoppedBlinking | |
return | |
} | |
} | |
} | |
func blinker(pin rpio.Pin) (chan<- bool, chan<- chan bool) { | |
resetBlinking := make(chan bool) | |
stopBlinking := make(chan chan bool) | |
go func() { | |
var everySecond <-chan time.Time | |
resetTimer := func() { everySecond = time.Tick(1 * time.Second) } | |
resetTimer() | |
blinkDelay := startBlinkDelay | |
printBlinkDelay := func() { log.Printf("Blink delay now %v", blinkDelay) } | |
for { | |
select { | |
case <-resetBlinking: | |
blinkDelay = startBlinkDelay | |
printBlinkDelay() | |
resetTimer() | |
case <-everySecond: | |
blinkDelay *= 2 | |
printBlinkDelay() | |
case stoppedBlinking := <-stopBlinking: | |
everySecond = nil | |
stoppedBlinking <- true | |
default: | |
time.Sleep(time.Duration(blinkDelay) * time.Millisecond) | |
pin.High() | |
time.Sleep(10 * time.Millisecond) | |
pin.Low() | |
} | |
} | |
}() | |
return resetBlinking, stopBlinking | |
} |
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