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