//Run this as a go routine to handle asynchronous output
//cache requests.
func (cache OutputCache) outputCacheHandler() {
_cache := make(map[string]map[int]gocmc.Output)
for true {
select {
case req := <-cache.requestChannel:
//have we cached _anything_ for this output yet?
if outputs, outputCached := _cache[req.outputName]; outputCached {
if output, exists := outputs[req.midiChannel]; exists {
req.replyChannel <- output
} else {
fmt.Printf("New channel for %s\n", req.outputName)
destination := gocmc.GetDestinations()[req.outputName].Endpoint
output := cache.client.NewOutput(req.outputName+"-output", req.midiChannel, destination)
outputs[req.midiChannel] = output
_cache[req.outputName] = outputs
req.replyChannel <- output
}
} else {
fmt.Println("No existing output, creating")
destination := gocmc.GetDestinations()[req.outputName].Endpoint
output := cache.client.NewOutput(req.outputName+"-output", req.midiChannel, destination)
fmt.Println("New output: ", output)
outputs := make(map[int]gocmc.Output)
outputs[req.midiChannel] = output
_cache[req.outputName] = outputs
req.replyChannel <- output
}
}
}
}
func main() {
bpm := flag.Int("bpm", 60, "beats per minute")
ppqn := flag.Int("ppqn", 24, "pulses per quarter note, default is 24 and that's probably what you want")
cycle := flag.Int("cycle", 24, "number of quarter notes before the cycle count resets, can affect sequence start/stop times")
host := flag.String("host", "localhost", "address to listen for HTTP")
port := flag.String("port", "4000", "port for HTTP requests")
flag.Parse()
stepLen := 60000 / *bpm / *ppqn
pulsesPerCycle := *ppqn * *cycle
listenAddress := *host + ":" + *port
fmt.Printf("bpm: %d\nppqn: %d\ncycle length: %d\n", *bpm, *ppqn, *cycle)
fmt.Printf("pulse length (ms): %d\npulse count per cycle: %d\n", stepLen, pulsesPerCycle)
fmt.Printf("listening for HTTP at: %s\n", listenAddress)
destinations := gocmc.GetDestinations()
fmt.Println("Destinations: ", destinations)
client := gocmc.MakeClient("goseq")
fmt.Println("Starting controller and handler")
con := NewController(pulsesPerCycle, stepLen)
StartSequenceHandler(con, client)
StartDestinationsHandler()
StartControlHandler(con)
fmt.Println("Starting server")
http.ListenAndServe(listenAddress, nil)
}
func (du DestinationUpdates) ServeHTTP(w http.ResponseWriter, r *http.Request) {
destinations := gocmc.GetDestinations()
w.Write(destinationsToJson(destinations))
}