mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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1b430e0c17
* deadline warn * add proper godoc information * clarify * Merge refs/heads/master into corrupted-clock * fix broken build * Merge refs/heads/master into corrupted-clock * Merge refs/heads/master into corrupted-clock
135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
package sync
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import (
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"context"
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"errors"
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"fmt"
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"time"
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libp2pcore "github.com/libp2p/go-libp2p-core"
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"github.com/libp2p/go-libp2p-core/peer"
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"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
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)
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// pingHandler reads the incoming ping rpc message from the peer.
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func (s *Service) pingHandler(ctx context.Context, msg interface{}, stream libp2pcore.Stream) error {
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SetRPCStreamDeadlines(stream)
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m, ok := msg.(*uint64)
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if !ok {
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if err := stream.Close(); err != nil {
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log.WithError(err).Error("Failed to close stream")
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}
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return fmt.Errorf("wrong message type for ping, got %T, wanted *uint64", msg)
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}
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valid, err := s.validateSequenceNum(*m, stream.Conn().RemotePeer())
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if err != nil {
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if err := stream.Close(); err != nil {
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log.WithError(err).Error("Failed to close stream")
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}
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return err
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}
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if _, err := stream.Write([]byte{responseCodeSuccess}); err != nil {
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if err := stream.Close(); err != nil {
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log.WithError(err).Error("Failed to close stream")
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}
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return err
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}
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if _, err := s.p2p.Encoding().EncodeWithLength(stream, s.p2p.MetadataSeq()); err != nil {
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if err := stream.Close(); err != nil {
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log.WithError(err).Error("Failed to close stream")
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}
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return err
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}
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if valid {
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// If the sequence number was valid we're done.
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if err := stream.Close(); err != nil {
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log.WithError(err).Error("Failed to close stream")
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}
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return nil
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}
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// The sequence number was not valid. Start our own ping back to the peer.
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go func() {
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defer func() {
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if err := stream.Close(); err != nil {
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log.WithError(err).Error("Failed to close stream")
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}
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}()
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// New context so the calling function doesn't cancel on us.
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ctx, cancel := context.WithTimeout(context.Background(), ttfbTimeout)
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defer cancel()
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md, err := s.sendMetaDataRequest(ctx, stream.Conn().RemotePeer())
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if err != nil {
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log.WithField("peer", stream.Conn().RemotePeer()).WithError(err).Debug("Failed to send metadata request")
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return
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}
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// update metadata if there is no error
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s.p2p.Peers().SetMetadata(stream.Conn().RemotePeer(), md)
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}()
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return nil
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}
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func (s *Service) sendPingRequest(ctx context.Context, id peer.ID) error {
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ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
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defer cancel()
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metadataSeq := s.p2p.MetadataSeq()
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stream, err := s.p2p.Send(ctx, &metadataSeq, p2p.RPCPingTopic, id)
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if err != nil {
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return err
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}
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defer func() {
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if err := stream.Reset(); err != nil {
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log.WithError(err).Errorf("Failed to reset stream with protocol %s", stream.Protocol())
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}
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}()
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code, errMsg, err := ReadStatusCode(stream, s.p2p.Encoding())
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if err != nil {
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return err
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}
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if code != 0 {
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s.p2p.Peers().IncrementBadResponses(stream.Conn().RemotePeer())
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return errors.New(errMsg)
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}
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msg := new(uint64)
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if err := s.p2p.Encoding().DecodeWithLength(stream, msg); err != nil {
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return err
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}
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valid, err := s.validateSequenceNum(*msg, stream.Conn().RemotePeer())
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if err != nil {
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s.p2p.Peers().IncrementBadResponses(stream.Conn().RemotePeer())
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return err
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}
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if valid {
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return nil
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}
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md, err := s.sendMetaDataRequest(ctx, stream.Conn().RemotePeer())
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if err != nil {
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// do not increment bad responses, as its
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// already done in the request method.
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return err
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}
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s.p2p.Peers().SetMetadata(stream.Conn().RemotePeer(), md)
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return nil
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}
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// validates the peer's sequence number.
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func (s *Service) validateSequenceNum(seq uint64, id peer.ID) (bool, error) {
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md, err := s.p2p.Peers().Metadata(id)
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if err != nil {
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return false, err
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}
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if md == nil {
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return false, nil
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}
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if md.SeqNumber != seq {
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return false, nil
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}
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return true, nil
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}
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