mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2025-01-06 02:52:19 +00:00
112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
/*
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Copyright 2022 Erigon-Lightclient contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sentinel
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import (
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"context"
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"errors"
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"fmt"
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"reflect"
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"sync"
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"github.com/ledgerwatch/erigon/cmd/lightclient/sentinel/communication"
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"github.com/ledgerwatch/log/v3"
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pubsub "github.com/libp2p/go-libp2p-pubsub"
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"github.com/libp2p/go-libp2p/core/peer"
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)
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// GossipSubscription abstracts a gossip subscription to write decoded structs.
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type GossipSubscription struct {
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gossip_topic GossipTopic
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host peer.ID
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ch chan *communication.GossipContext
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ctx context.Context
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p communication.GossipCodec
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topic *pubsub.Topic
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sub *pubsub.Subscription
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cf context.CancelFunc
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rf pubsub.RelayCancelFunc
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setup sync.Once
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}
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func (sub *GossipSubscription) Listen() (err error) {
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sub.setup.Do(func() {
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sub.sub, err = sub.topic.Subscribe()
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if err != nil {
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err = fmt.Errorf("failed to begin topic %s subscription, err=%w", sub.topic.String(), err)
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return
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}
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sub.p = sub.gossip_topic.Codec(sub.sub, sub.topic)
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var sctx context.Context
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sctx, sub.cf = context.WithCancel(sub.ctx)
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go sub.run(sctx)
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})
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return nil
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}
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// calls the cancel func for the subscriber and closes the topic and sub
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func (s *GossipSubscription) Close() {
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if s.cf != nil {
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s.cf()
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}
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if s.rf != nil {
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s.rf()
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}
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if s.sub != nil {
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s.sub.Cancel()
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s.sub = nil
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}
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if s.topic != nil {
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s.topic.Close()
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s.topic = nil
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}
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}
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// this is a helper to begin running the gossip subscription.
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// function should not be used outside of the constructor for gossip subscription
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func (s *GossipSubscription) run(ctx context.Context) {
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for {
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s.do(ctx)
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}
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}
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func (s *GossipSubscription) do(ctx context.Context) {
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defer func() {
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if r := recover(); r != nil {
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log.Error("[Gossip] Message Handler Crashed", "err", r)
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}
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}()
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select {
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case <-ctx.Done():
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return
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default:
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val := s.gossip_topic.Typ.Clone()
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pctx, err := s.p.Decode(ctx, val)
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if err != nil {
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if errors.Is(err, context.Canceled) {
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return
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}
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log.Warn("fail to decode gossip packet", "err", err, "topic", pctx.Topic, "pkt", reflect.TypeOf(val))
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return
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}
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if pctx.Msg.GetFrom() == s.host {
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return
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}
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s.ch <- pctx
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}
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}
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