syncthing/lib/nat/registry.go

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// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package nat
import (
"context"
"sync"
"time"
)
type DiscoverFunc func(ctx context.Context, renewal, timeout time.Duration) []Device
var providers []DiscoverFunc
func Register(provider DiscoverFunc) {
providers = append(providers, provider)
}
func discoverAll(ctx context.Context, renewal, timeout time.Duration) map[string]Device {
wg := &sync.WaitGroup{}
wg.Add(len(providers))
c := make(chan Device)
done := make(chan struct{})
for _, discoverFunc := range providers {
go func(f DiscoverFunc) {
defer wg.Done()
for _, dev := range f(ctx, renewal, timeout) {
select {
case c <- dev:
case <-ctx.Done():
return
}
}
}(discoverFunc)
}
nats := make(map[string]Device)
go func() {
defer close(done)
for {
select {
case dev, ok := <-c:
if !ok {
return
}
nats[dev.ID()] = dev
case <-ctx.Done():
return
}
}
}()
wg.Wait()
close(c)
<-done
return nats
}