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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package p2p
import (
"context"
"time"
"github.com/algorand/go-algorand/config"
pubsub "github.com/libp2p/go-libp2p-pubsub"
pubsub_pb "github.com/libp2p/go-libp2p-pubsub/pb"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/peer"
"golang.org/x/crypto/blake2b"
)
func init() {
// configure larger overlay parameters
pubsub.GossipSubD = 8
pubsub.GossipSubDscore = 6
pubsub.GossipSubDout = 3
pubsub.GossipSubDlo = 6
pubsub.GossipSubDhi = 12
pubsub.GossipSubDlazy = 12
pubsub.GossipSubDirectConnectInitialDelay = 30 * time.Second
pubsub.GossipSubIWantFollowupTime = 5 * time.Second
pubsub.GossipSubHistoryLength = 10
pubsub.GossipSubGossipFactor = 0.1
}
const (
gossipScoreThreshold = -500
publishScoreThreshold = -1000
graylistScoreThreshold = -2500
acceptPXScoreThreshold = 1000
opportunisticGraftScoreThreshold = 3.5
)
// TXTopicName defines a pubsub topic for TX messages
const TXTopicName = "/algo/tx/0.1.0"
func makePubSub(ctx context.Context, cfg config.Local, host host.Host) (*pubsub.PubSub, error) {
//defaultParams := pubsub.DefaultGossipSubParams()
options := []pubsub.Option{
pubsub.WithPeerScore(&pubsub.PeerScoreParams{
DecayInterval: pubsub.DefaultDecayInterval,
DecayToZero: pubsub.DefaultDecayToZero,
AppSpecificScore: func(p peer.ID) float64 { return 1000 },
Topics: map[string]*pubsub.TopicScoreParams{
TXTopicName: {
TopicWeight: 0.1,
TimeInMeshWeight: 0.0002778, // ~1/3600
TimeInMeshQuantum: time.Second,
TimeInMeshCap: 1,
FirstMessageDeliveriesWeight: 0.5, // max value is 50
FirstMessageDeliveriesDecay: pubsub.ScoreParameterDecay(10 * time.Minute),
FirstMessageDeliveriesCap: 100, // 100 messages in 10 minutes
// invalid messages decay after 1 hour
InvalidMessageDeliveriesWeight: -1000,
InvalidMessageDeliveriesDecay: pubsub.ScoreParameterDecay(time.Hour),
},
},
},
&pubsub.PeerScoreThresholds{
GossipThreshold: gossipScoreThreshold,
PublishThreshold: publishScoreThreshold,
GraylistThreshold: graylistScoreThreshold,
AcceptPXThreshold: acceptPXScoreThreshold,
OpportunisticGraftThreshold: opportunisticGraftScoreThreshold,
},
),
// pubsub.WithPeerGater(&pubsub.PeerGaterParams{}),
pubsub.WithSubscriptionFilter(pubsub.WrapLimitSubscriptionFilter(pubsub.NewAllowlistSubscriptionFilter(TXTopicName), 100)),
// pubsub.WithEventTracer(jsonTracer),
pubsub.WithValidateQueueSize(256),
// pubsub.WithValidateThrottle(cfg.TxBacklogSize),
}
return pubsub.NewGossipSub(ctx, host, options...)
}
func txMsgID(m *pubsub_pb.Message) string {
h := blake2b.Sum256(m.Data)
return string(h[:])
}
// getOrCreateTopic returns a topic if it was already joined previously and otherwise creates it and adds it to the topics map
func (s *serviceImpl) getOrCreateTopic(topicName string) (*pubsub.Topic, error) {
s.topicsMu.RLock()
topic, ok := s.topics[topicName]
s.topicsMu.RUnlock()
if ok {
return topic, nil
}
s.topicsMu.Lock()
defer s.topicsMu.Unlock()
// check again in case it was created while we were waiting for the lock
if _, ok := s.topics[topicName]; !ok {
var topt []pubsub.TopicOpt
switch topicName {
case TXTopicName:
topt = append(topt, pubsub.WithTopicMessageIdFn(txMsgID))
}
psTopic, err := s.pubsub.Join(topicName, topt...)
if err != nil {
return nil, err
}
s.topics[topicName] = psTopic
}
return s.topics[topicName], nil
}
// Subscribe returns a subscription to the given topic
func (s *serviceImpl) Subscribe(topic string, val pubsub.ValidatorEx) (*pubsub.Subscription, error) {
if err := s.pubsub.RegisterTopicValidator(topic, val); err != nil {
return nil, err
}
t, err := s.getOrCreateTopic(topic)
if err != nil {
return nil, err
}
// t.SetScoreParams() // already set in makePubSub
return t.Subscribe()
}
// Publish publishes data to the given topic
func (s *serviceImpl) Publish(ctx context.Context, topic string, data []byte) error {
t, err := s.getOrCreateTopic(topic)
if err != nil {
return err
}
return t.Publish(ctx, data)
}
// ListPeersForTopic returns a list of peers subscribed to the given topic, exported for access from the network package
func (s *serviceImpl) ListPeersForTopic(topic string) []peer.ID {
return s.pubsub.ListPeers(topic)
}
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