prysm-pulse/beacon-chain/p2p/handshake.go

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package p2p
import (
"context"
"sync"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
)
var handshakes = make(map[peer.ID]*pb.Hello)
var handshakeLock sync.Mutex
// AddHandshake to the local records for initial sync.
func (p *Service) AddHandshake(pid peer.ID, hello *pb.Hello) {
handshakeLock.Lock()
defer handshakeLock.Unlock()
handshakes[pid] = hello
}
// Handshakes has not been implemented yet and it may be moved to regular sync...
func (p *Service) Handshakes() map[peer.ID]*pb.Hello {
return nil
}
// AddConnectionHandler adds a callback function which handles the connection with a
// newly added peer. It performs a handshake with that peer by sending a hello request
// and validating the response from the peer.
func (p *Service) AddConnectionHandler(reqFunc func(ctx context.Context, id peer.ID) error) {
p.host.Network().Notify(&network.NotifyBundle{
ConnectedF: func(net network.Network, conn network.Conn) {
// Must be handled in a goroutine as this callback cannot be blocking.
go func() {
ctx := context.Background()
log.WithField("peer", conn.RemotePeer()).Debug(
"Performing handshake with to peer",
)
if err := reqFunc(ctx, conn.RemotePeer()); err != nil {
log.WithError(err).Error("Could not send successful hello rpc request")
if err := p.Disconnect(conn.RemotePeer()); err != nil {
log.WithError(err).Errorf("Unable to close peer %s", conn.RemotePeer())
return
}
log.WithField("peer", conn.RemotePeer().Pretty()).Info("New peer connected.")
}
}()
},
})
}