midi-request-trigger/main.go

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2023-09-09 20:37:39 -05:00
package main
import (
"context"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"gitlab.com/gomidi/midi/v2"
_ "gitlab.com/gomidi/midi/v2/drivers/rtmididrv"
)
const (
serviceName = "midi-request-trigger"
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serviceDescription = "Takes trigger MIDI messages by HTTP or MQTT requests and trigger HTTP or MQTT requests by MIDI messages"
serviceVersion = "0.2.1"
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)
// App is the global application structure for communicating between servers and storing information.
type App struct {
flags *Flags
config *Config
http *HTTPServer
}
var app *App
func main() {
app = new(App)
app.ParseFlags()
app.ReadConfig()
app.http = NewHTTPServer()
// Make sure midi drivers are closed when the app closes.
defer midi.CloseDriver()
// If no routers defined, or request to list devices.
if app.flags.ListMidiDevices || len(app.config.MidiRouters) == 0 {
// If no routers are defined, print notice about configuring one.
if len(app.config.MidiRouters) == 0 {
log.Println("No routers configured, please configure one.")
}
// Print available devices.
fmt.Printf("MIDI in ports\n")
fmt.Println(midi.GetInPorts())
fmt.Printf("\n\nMIDI out ports\n")
fmt.Println(midi.GetOutPorts())
fmt.Printf("\n\n")
return
}
// Connect to each router and and setup HTTP handlers.
for _, router := range app.config.MidiRouters {
router.Connect()
for _, trig := range router.RequestTriggers {
app.http.mux.HandleFunc(trig.URI, router.Handler)
}
}
// Setup context with cancellation function to allow background services to gracefully stop.
ctx, ctxCancel := context.WithCancel(context.Background())
// Start listening on HTTP server.
app.http.Start(ctx)
// Monitor common signals.
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
// Wait for a signal.
<-c
// Stop HTTP server.
ctxCancel()
// Disconnect all MIDI listeners.
for _, router := range app.config.MidiRouters {
router.Disconnect()
}
}