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directSender.go
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directSender.go
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package libp2p
import (
"bufio"
"bytes"
"context"
"encoding/binary"
"fmt"
"io"
"sync"
"sync/atomic"
"time"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go/p2p"
ggio "github.com/gogo/protobuf/io"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
pubsub "github.com/libp2p/go-libp2p-pubsub"
pubsubPb "github.com/libp2p/go-libp2p-pubsub/pb"
"github.com/whyrusleeping/timecache"
)
var _ p2p.DirectSender = (*directSender)(nil)
const timeSeenMessages = time.Second * 120
const maxMutexes = 10000
type directSender struct {
counter uint64
ctx context.Context
hostP2P host.Host
messageHandler func(msg *pubsub.Message, fromConnectedPeer core.PeerID) error
mutSeenMessages sync.Mutex
seenMessages *timecache.TimeCache
mutexForPeer *MutexHolder
}
// NewDirectSender returns a new instance of direct sender object
func NewDirectSender(
ctx context.Context,
h host.Host,
messageHandler func(msg *pubsub.Message, fromConnectedPeer core.PeerID) error,
) (*directSender, error) {
if h == nil {
return nil, p2p.ErrNilHost
}
if ctx == nil {
return nil, p2p.ErrNilContext
}
if messageHandler == nil {
return nil, p2p.ErrNilDirectSendMessageHandler
}
mutexForPeer, err := NewMutexHolder(maxMutexes)
if err != nil {
return nil, err
}
ds := &directSender{
counter: uint64(time.Now().UnixNano()),
ctx: ctx,
hostP2P: h,
seenMessages: timecache.NewTimeCache(timeSeenMessages),
messageHandler: messageHandler,
mutexForPeer: mutexForPeer,
}
// wire-up a handler for direct messages
h.SetStreamHandler(DirectSendID, ds.directStreamHandler)
return ds, nil
}
func (ds *directSender) directStreamHandler(s network.Stream) {
reader := ggio.NewDelimitedReader(s, maxSendBuffSize)
go func(r ggio.ReadCloser) {
for {
msg := &pubsubPb.Message{}
err := reader.ReadMsg(msg)
if err != nil {
// stream has encountered an error, close this go routine
if err != io.EOF {
_ = s.Reset()
log.Trace("error reading rpc",
"from", s.Conn().RemotePeer(),
"error", err.Error(),
)
} else {
// Just be nice. They probably won't read this
// but it doesn't hurt to send it.
_ = s.Close()
}
return
}
err = ds.processReceivedDirectMessage(msg, s.Conn().RemotePeer())
if err != nil {
log.Trace("p2p processReceivedDirectMessage", "error", err.Error())
}
}
}(reader)
}
func (ds *directSender) processReceivedDirectMessage(message *pubsubPb.Message, fromConnectedPeer peer.ID) error {
if message == nil {
return p2p.ErrNilMessage
}
if message.Topic == nil {
return p2p.ErrNilTopic
}
if !bytes.Equal(message.GetFrom(), []byte(fromConnectedPeer)) {
return fmt.Errorf("%w mismatch between From and fromConnectedPeer values", p2p.ErrInvalidValue)
}
if ds.checkAndSetSeenMessage(message) {
return p2p.ErrAlreadySeenMessage
}
pbMessage := &pubsub.Message{
Message: message,
}
return ds.messageHandler(pbMessage, core.PeerID(fromConnectedPeer))
}
func (ds *directSender) checkAndSetSeenMessage(msg *pubsubPb.Message) bool {
msgId := string(msg.GetFrom()) + string(msg.GetSeqno())
ds.mutSeenMessages.Lock()
defer ds.mutSeenMessages.Unlock()
if ds.seenMessages.Has(msgId) {
return true
}
ds.seenMessages.Add(msgId)
return false
}
// NextSeqno returns the next uint64 found in *counter as byte slice
func (ds *directSender) NextSeqno() []byte {
seqno := make([]byte, 8)
newVal := atomic.AddUint64(&ds.counter, 1)
binary.BigEndian.PutUint64(seqno, newVal)
return seqno
}
// Send will send a direct message to the connected peer
func (ds *directSender) Send(topic string, buff []byte, peer core.PeerID) error {
if len(buff) >= maxSendBuffSize {
return fmt.Errorf("%w, to be sent: %d, maximum: %d", p2p.ErrMessageTooLarge, len(buff), maxSendBuffSize)
}
mut := ds.mutexForPeer.Get(string(peer))
mut.Lock()
defer mut.Unlock()
conn, err := ds.getConnection(peer)
if err != nil {
return err
}
stream, err := ds.getOrCreateStream(conn)
if err != nil {
return err
}
msg := ds.createMessage(topic, buff, conn)
bufw := bufio.NewWriter(stream)
w := ggio.NewDelimitedWriter(bufw)
err = w.WriteMsg(msg)
if err != nil {
_ = stream.Reset()
_ = stream.Close()
return err
}
err = bufw.Flush()
if err != nil {
_ = stream.Reset()
_ = stream.Close()
return err
}
return nil
}
func (ds *directSender) getConnection(p core.PeerID) (network.Conn, error) {
conns := ds.hostP2P.Network().ConnsToPeer(peer.ID(p))
if len(conns) == 0 {
return nil, p2p.ErrPeerNotDirectlyConnected
}
// return the connection that has the highest number of streams
lStreams := 0
var conn network.Conn
for _, c := range conns {
length := len(c.GetStreams())
if length >= lStreams {
lStreams = length
conn = c
}
}
return conn, nil
}
func (ds *directSender) getOrCreateStream(conn network.Conn) (network.Stream, error) {
streams := conn.GetStreams()
var foundStream network.Stream
for i := 0; i < len(streams); i++ {
isExpectedStream := streams[i].Protocol() == DirectSendID
isSendableStream := streams[i].Stat().Direction == network.DirOutbound
if isExpectedStream && isSendableStream {
foundStream = streams[i]
break
}
}
var err error
if foundStream == nil {
foundStream, err = ds.hostP2P.NewStream(ds.ctx, conn.RemotePeer(), DirectSendID)
if err != nil {
return nil, err
}
}
return foundStream, nil
}
func (ds *directSender) createMessage(topic string, buff []byte, conn network.Conn) *pubsubPb.Message {
seqno := ds.NextSeqno()
mes := pubsubPb.Message{}
mes.Data = buff
mes.Topic = &topic
mes.From = []byte(conn.LocalPeer())
mes.Seqno = seqno
return &mes
}
// IsInterfaceNil returns true if there is no value under the interface
func (ds *directSender) IsInterfaceNil() bool {
return ds == nil
}