mirror of https://github.com/status-im/go-waku.git
144 lines
3.3 KiB
Go
144 lines
3.3 KiB
Go
package noise
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import (
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"context"
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n "github.com/waku-org/go-noise"
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"github.com/waku-org/go-waku/waku/v2/protocol/pb"
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"github.com/waku-org/go-waku/waku/v2/protocol/relay"
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"github.com/waku-org/go-waku/waku/v2/timesource"
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)
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type NoiseMessenger interface {
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Sender
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Receiver
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Stop()
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}
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type contentTopicSubscription struct {
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broadcastSub relay.Subscription
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msgChan chan *pb.WakuMessage
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}
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type NoiseWakuRelay struct {
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NoiseMessenger
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relay *relay.WakuRelay
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relaySub *relay.Subscription
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broadcaster relay.Broadcaster
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cancel context.CancelFunc
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timesource timesource.Timesource
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pubsubTopic string
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subscriptionChPerContentTopic map[string][]contentTopicSubscription
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}
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func NewWakuRelayMessenger(ctx context.Context, r *relay.WakuRelay, pubsubTopic *string, timesource timesource.Timesource) (*NoiseWakuRelay, error) {
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var topic string
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if pubsubTopic != nil {
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topic = *pubsubTopic
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} else {
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topic = relay.DefaultWakuTopic
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}
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subs, err := r.SubscribeToTopic(ctx, topic)
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if err != nil {
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return nil, err
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}
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ctx, cancel := context.WithCancel(ctx)
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wr := &NoiseWakuRelay{
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relay: r,
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relaySub: subs,
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cancel: cancel,
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timesource: timesource,
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broadcaster: relay.NewBroadcaster(1024),
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pubsubTopic: topic,
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subscriptionChPerContentTopic: make(map[string][]contentTopicSubscription),
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}
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err = wr.broadcaster.Start(ctx)
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if err != nil {
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return nil, err
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}
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go func() {
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for {
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select {
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case <-ctx.Done():
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subs.Unsubscribe()
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wr.broadcaster.Stop()
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return
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case envelope := <-subs.Ch:
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if envelope != nil {
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wr.broadcaster.Submit(envelope)
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}
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}
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}
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}()
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return wr, nil
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}
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func (r *NoiseWakuRelay) Subscribe(ctx context.Context, contentTopic string) <-chan *pb.WakuMessage {
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sub := contentTopicSubscription{
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msgChan: make(chan *pb.WakuMessage, 1024),
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}
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broadcastSub := r.broadcaster.RegisterForAll(1024)
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sub.broadcastSub = broadcastSub
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subscriptionCh := r.subscriptionChPerContentTopic[contentTopic]
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subscriptionCh = append(subscriptionCh, sub)
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r.subscriptionChPerContentTopic[contentTopic] = subscriptionCh
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go func() {
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for {
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select {
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case <-ctx.Done():
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close(sub.msgChan)
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return
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case env := <-sub.broadcastSub.Ch:
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if env == nil {
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return
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}
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if env.Message().ContentTopic != contentTopic || env.Message().Version != 2 {
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continue
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}
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// TODO: Might make sense to create a ring buffer here, to drop messages if queue fills up
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sub.msgChan <- env.Message()
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}
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}
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}()
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return sub.msgChan
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}
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func (r *NoiseWakuRelay) Publish(ctx context.Context, contentTopic string, payload *n.PayloadV2) error {
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message, err := EncodePayloadV2(payload)
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if err != nil {
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return err
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}
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message.ContentTopic = contentTopic
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message.Timestamp = r.timesource.Now().UnixNano()
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_, err = r.relay.PublishToTopic(ctx, message, r.pubsubTopic)
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return err
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}
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func (r *NoiseWakuRelay) Stop() {
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if r.cancel == nil {
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return
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}
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r.cancel()
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for _, contentTopicSubscriptions := range r.subscriptionChPerContentTopic {
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for _, c := range contentTopicSubscriptions {
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c.broadcastSub.Unsubscribe()
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}
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}
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}
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