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ping.go
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ping.go
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/*
* Copyright (c) 2017-2020 The qitmeer developers
*/
package synch
import (
"context"
"errors"
"fmt"
"github.com/Qitmeer/qitmeer/common/roughtime"
"github.com/Qitmeer/qitmeer/p2p/common"
"github.com/Qitmeer/qitmeer/p2p/peers"
libp2pcore "github.com/libp2p/go-libp2p-core"
"github.com/libp2p/go-libp2p-core/peer"
)
// pingHandler reads the incoming ping rpc message from the peer.
func (s *Sync) pingHandler(ctx context.Context, msg interface{}, stream libp2pcore.Stream) *common.Error {
pe := s.peers.Get(stream.Conn().RemotePeer())
if pe == nil {
return ErrPeerUnknown
}
log.Trace(fmt.Sprintf("pingHandler:%s", pe.GetID()))
m, ok := msg.(*uint64)
if !ok {
return ErrMessage(fmt.Errorf("wrong message type for ping, got %T, wanted *uint64", msg))
}
valid, err := s.validateSequenceNum(*m, pe)
if err != nil {
return common.NewError(common.ErrDAGConsensus, err)
}
e := s.EncodeResponseMsg(stream, s.p2p.MetadataSeq())
if e != nil {
return e
}
if valid {
return nil
}
// The sequence number was not valid. Start our own ping back to the peer.
go func(id peer.ID) {
// New context so the calling function doesn't cancel on us.
ctx, cancel := context.WithTimeout(s.p2p.Context(), TtfbTimeout)
defer cancel()
md, err := s.sendMetaDataRequest(ctx, id)
if err != nil {
log.Debug(fmt.Sprintf("Failed to send metadata request:peer=%s error=%v", id, err))
return
}
// update metadata if there is no error
pe.SetMetadata(md)
}(stream.Conn().RemotePeer())
return nil
}
func (s *Sync) SendPingRequest(ctx context.Context, id peer.ID) error {
pe := s.peers.Get(id)
if pe == nil {
return peers.ErrPeerUnknown
}
log.Trace(fmt.Sprintf("SendPingRequest:%s", pe.GetID()))
ctx, cancel := context.WithTimeout(ctx, ReqTimeout)
defer cancel()
metadataSeq := s.p2p.MetadataSeq()
stream, err := s.Send(ctx, &metadataSeq, RPCPingTopic, id)
if err != nil {
return err
}
currentTime := roughtime.Now()
defer func() {
if err := stream.Reset(); err != nil {
log.Error(fmt.Sprintf("Failed to reset stream with protocol %s", stream.Protocol()))
}
}()
code, errMsg, err := ReadRspCode(stream, s.Encoding())
if err != nil {
return err
}
// Records the latency of the ping request for that peer.
s.p2p.Host().Peerstore().RecordLatency(id, roughtime.Now().Sub(currentTime))
if code != 0 {
s.Peers().IncrementBadResponses(stream.Conn().RemotePeer(), "ping request rsp")
return errors.New(errMsg)
}
msg := new(uint64)
if err := s.Encoding().DecodeWithMaxLength(stream, msg); err != nil {
return err
}
valid, err := s.validateSequenceNum(*msg, pe)
if err != nil {
s.Peers().IncrementBadResponses(stream.Conn().RemotePeer(), "ping request rsp validate seq num")
return err
}
if valid {
return nil
}
md, err := s.sendMetaDataRequest(ctx, stream.Conn().RemotePeer())
if err != nil {
// do not increment bad responses, as its
// already done in the request method.
return err
}
pe.SetMetadata(md)
return nil
}
// validates the peer's sequence number.
func (s *Sync) validateSequenceNum(seq uint64, pe *peers.Peer) (bool, error) {
md := pe.Metadata()
if md == nil {
return false, nil
}
if md.SeqNumber != seq {
return false, nil
}
return true, nil
}