go/src/vanadium/discovery/discovery.go

package main

import (
	"log"

	"v.io/v23"
	idiscovery "v.io/x/ref/lib/discovery"
	"v.io/x/ref/lib/discovery/plugins/ble"
	"v.io/x/ref/lib/discovery/plugins/mdns"

	_ "v.io/x/ref/runtime/factories/generic"

	mojom "mojom/vanadium/discovery"
	"vanadium/discovery/internal"

	"mojo/public/go/application"
	"mojo/public/go/bindings"
	"mojo/public/go/system"
)

//#include "mojo/public/c/system/types.h"
import "C"

type discoveryDelegate struct {
	stubs    []*bindings.Stub
	impl     *internal.DiscoveryService
	shutdown v23.Shutdown
}

func (d *discoveryDelegate) Initialize(c application.Context) {
	ctx, shutdown := v23.Init()
	host := c.Args()[1]
	log.Println("Starting discovery with name", host)
	mplugin, err := mdns.New(host)
	if err != nil {
		log.Println("Failed to start mplugin", err)
	}

	bplugin, err := ble.NewPlugin(host)
	if err != nil {
		log.Println("Failed to start bplugin", err)
	}

	d.impl = internal.NewDiscoveryService(ctx, idiscovery.New([]idiscovery.Plugin{mplugin, bplugin}))
	d.shutdown = shutdown
}

func (d *discoveryDelegate) Create(request mojom.Discoverer_Request) {
	stub := mojom.NewDiscovererStub(request, d.impl, bindings.GetAsyncWaiter())
	d.stubs = append(d.stubs, stub)
	go func() {
		for {
			if err := stub.ServeRequest(); err != nil {
				connectionErr, ok := err.(*bindings.ConnectionError)
				if !ok || !connectionErr.Closed() {
					log.Println(err)
				}
				break
			}
		}
	}()
}

func (d *discoveryDelegate) AcceptConnection(connection *application.Connection) {
	connection.ProvideServices(&mojom.Discoverer_ServiceFactory{d})
}

func (d *discoveryDelegate) Quit() {
	d.impl.Stop()
	d.shutdown()
	for _, stub := range d.stubs {
		stub.Close()
	}
}

//export MojoMain
func MojoMain(handle C.MojoHandle) C.MojoResult {
	application.Run(&discoveryDelegate{}, system.MojoHandle(handle))
	return C.MOJO_RESULT_OK
}

func main() {
}