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pubsub_monitor.go
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pubsub_monitor.go
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package ipfsutil
import (
"sync"
"github.com/libp2p/go-libp2p-core/event"
host "github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
ps "github.com/libp2p/go-libp2p-pubsub"
ps_pb "github.com/libp2p/go-libp2p-pubsub/pb"
"go.uber.org/zap"
"berty.tech/berty/v2/go/internal/logutil"
)
// PubsubMonitor is an EventTracer
var _ ps.EventTracer = (*PubsubMonitor)(nil)
type EventMonitor int
const (
TypeEventMonitorPeerUnknown EventMonitor = iota
TypeEventMonitorPeerJoined
TypeEventMonitorPeerLeft
)
type EventTracer interface {
EventTracerOption() ps.Option
}
type EvtPubSubTopic struct {
EventType EventMonitor
Topic string
PeerID peer.ID
}
type PubsubMonitor struct {
logger *zap.Logger
h host.Host
ps *ps.PubSub
emitter event.Emitter
muPeersTopics sync.Mutex
peersTopics map[peer.ID][]string
}
func NewPubsubMonitor(l *zap.Logger, h host.Host) (EventTracer, error) {
emitter, err := h.EventBus().Emitter(new(EvtPubSubTopic))
if err != nil {
return nil, err
}
return &PubsubMonitor{
h: h,
logger: l,
emitter: emitter,
peersTopics: make(map[peer.ID][]string),
}, nil
}
func (pt *PubsubMonitor) EventTracerOption() ps.Option {
return func(p *ps.PubSub) error {
pt.ps = p
return ps.WithEventTracer(pt)(p)
}
}
func (pt *PubsubMonitor) Trace(e *ps_pb.TraceEvent) {
switch e.GetType() {
case ps_pb.TraceEvent_JOIN:
topic := e.GetJoin().GetTopic()
peer := pt.h.ID()
pt.Emit(&EvtPubSubTopic{
EventType: TypeEventMonitorPeerJoined,
Topic: topic,
PeerID: peer,
})
case ps_pb.TraceEvent_LEAVE:
topic := e.GetLeave().GetTopic()
peer := pt.h.ID()
pt.Emit(&EvtPubSubTopic{
EventType: TypeEventMonitorPeerLeft,
Topic: topic,
PeerID: peer,
})
case ps_pb.TraceEvent_REMOVE_PEER:
peerid, err := peer.IDFromBytes(e.GetRemovePeer().GetPeerID())
if err != nil {
pt.logger.Warn("unable to parse peerid",
zap.String("type", e.GetType().String()),
logutil.PrivateString("topic", e.GetGraft().GetTopic()))
return
}
topics := pt.popTopicFromPeer(peerid)
for _, topic := range topics {
pt.Emit(&EvtPubSubTopic{
EventType: TypeEventMonitorPeerLeft,
Topic: topic,
PeerID: peerid,
})
}
case ps_pb.TraceEvent_GRAFT:
topic := e.GetGraft().GetTopic()
peerid, err := peer.IDFromBytes(e.GetGraft().GetPeerID())
if err != nil {
pt.logger.Warn("unable to parse peerid",
zap.String("type", e.GetType().String()),
logutil.PrivateString("topic", e.GetGraft().GetTopic()))
return
}
pt.addTopicToPeer(peerid, topic)
pt.Emit(&EvtPubSubTopic{
EventType: TypeEventMonitorPeerJoined,
Topic: topic,
PeerID: peerid,
})
case ps_pb.TraceEvent_PRUNE:
// @FIXME(gfanton): send this info as well
}
}
func (pt *PubsubMonitor) Emit(e *EvtPubSubTopic) {
if err := pt.emitter.Emit(*e); err != nil {
pt.logger.Warn("unable to emit pubsub event")
}
}
func (pt *PubsubMonitor) popTopicFromPeer(p peer.ID) []string {
pt.muPeersTopics.Lock()
defer pt.muPeersTopics.Unlock()
if topics, ok := pt.peersTopics[p]; ok {
delete(pt.peersTopics, p)
return topics
}
return []string{}
}
func (pt *PubsubMonitor) addTopicToPeer(p peer.ID, ns string) {
pt.muPeersTopics.Lock()
topics, ok := pt.peersTopics[p]
if !ok {
topics = make([]string, 0)
}
pt.peersTopics[p] = append(topics, ns)
pt.muPeersTopics.Unlock()
}