lotus/node/hello/hello.go

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package hello
import (
"context"
"time"
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"github.com/filecoin-project/go-state-types/abi"
xerrors "golang.org/x/xerrors"
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"github.com/filecoin-project/go-state-types/big"
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"github.com/ipfs/go-cid"
logging "github.com/ipfs/go-log/v2"
"github.com/libp2p/go-libp2p-core/host"
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inet "github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
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protocol "github.com/libp2p/go-libp2p-core/protocol"
cborutil "github.com/filecoin-project/go-cbor-util"
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"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/chain"
"github.com/filecoin-project/lotus/chain/store"
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"github.com/filecoin-project/lotus/chain/types"
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"github.com/filecoin-project/lotus/lib/peermgr"
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)
const ProtocolID = "/fil/hello/1.0.0"
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var log = logging.Logger("hello")
type HelloMessage struct {
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HeaviestTipSet []cid.Cid
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HeaviestTipSetHeight abi.ChainEpoch
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HeaviestTipSetWeight big.Int
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GenesisHash cid.Cid
}
type LatencyMessage struct {
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TArrival int64
TSent int64
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}
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type NewStreamFunc func(context.Context, peer.ID, ...protocol.ID) (inet.Stream, error)
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type Service struct {
h host.Host
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cs *store.ChainStore
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syncer *chain.Syncer
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pmgr *peermgr.PeerMgr
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}
func NewHelloService(h host.Host, cs *store.ChainStore, syncer *chain.Syncer, pmgr peermgr.MaybePeerMgr) *Service {
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if pmgr.Mgr == nil {
log.Warn("running without peer manager")
}
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return &Service{
h: h,
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cs: cs,
syncer: syncer,
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pmgr: pmgr.Mgr,
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}
}
func (hs *Service) HandleStream(s inet.Stream) {
var hmsg HelloMessage
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if err := cborutil.ReadCborRPC(s, &hmsg); err != nil {
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log.Infow("failed to read hello message, disconnecting", "error", err)
_ = s.Conn().Close()
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return
}
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arrived := build.Clock.Now()
log.Debugw("genesis from hello",
"tipset", hmsg.HeaviestTipSet,
"peer", s.Conn().RemotePeer(),
"hash", hmsg.GenesisHash)
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if hmsg.GenesisHash != hs.syncer.Genesis.Cids()[0] {
log.Warnf("other peer has different genesis! (%s)", hmsg.GenesisHash)
_ = s.Conn().Close()
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return
}
go func() {
defer s.Close() //nolint:errcheck
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sent := build.Clock.Now()
msg := &LatencyMessage{
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TArrival: arrived.UnixNano(),
TSent: sent.UnixNano(),
}
if err := cborutil.WriteCborRPC(s, msg); err != nil {
log.Debugf("error while responding to latency: %v", err)
}
}()
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protos, err := hs.h.Peerstore().GetProtocols(s.Conn().RemotePeer())
if err != nil {
log.Warnf("got error from peerstore.GetProtocols: %s", err)
}
if len(protos) == 0 {
log.Warn("other peer hasnt completed libp2p identify, waiting a bit")
// TODO: this better
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build.Clock.Sleep(time.Millisecond * 300)
}
if hs.pmgr != nil {
hs.pmgr.AddFilecoinPeer(s.Conn().RemotePeer())
}
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ts, err := hs.syncer.FetchTipSet(context.Background(), s.Conn().RemotePeer(), types.NewTipSetKey(hmsg.HeaviestTipSet...))
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if err != nil {
log.Errorf("failed to fetch tipset from peer during hello: %+v", err)
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return
}
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if ts.TipSet().Height() > 0 {
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hs.h.ConnManager().TagPeer(s.Conn().RemotePeer(), "fcpeer", 10)
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// don't bother informing about genesis
log.Infof("Got new tipset through Hello: %s from %s", ts.Cids(), s.Conn().RemotePeer())
hs.syncer.InformNewHead(s.Conn().RemotePeer(), ts)
}
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}
func (hs *Service) SayHello(ctx context.Context, pid peer.ID) error {
s, err := hs.h.NewStream(ctx, pid, ProtocolID)
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if err != nil {
return xerrors.Errorf("error opening stream: %w", err)
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}
hts := hs.cs.GetHeaviestTipSet()
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weight, err := hs.cs.Weight(ctx, hts)
if err != nil {
return err
}
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gen, err := hs.cs.GetGenesis()
if err != nil {
return err
}
hmsg := &HelloMessage{
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HeaviestTipSet: hts.Cids(),
HeaviestTipSetHeight: hts.Height(),
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HeaviestTipSetWeight: weight,
GenesisHash: gen.Cid(),
}
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log.Debug("Sending hello message: ", hts.Cids(), hts.Height(), gen.Cid())
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t0 := build.Clock.Now()
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if err := cborutil.WriteCborRPC(s, hmsg); err != nil {
return xerrors.Errorf("writing rpc to peer: %w", err)
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}
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go func() {
defer s.Close() //nolint:errcheck
lmsg := &LatencyMessage{}
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_ = s.SetReadDeadline(build.Clock.Now().Add(10 * time.Second))
err := cborutil.ReadCborRPC(s, lmsg)
if err != nil {
log.Infow("reading latency message", "error", err)
}
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t3 := build.Clock.Now()
lat := t3.Sub(t0)
// add to peer tracker
if hs.pmgr != nil {
hs.pmgr.SetPeerLatency(pid, lat)
}
if err == nil {
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if lmsg.TArrival != 0 && lmsg.TSent != 0 {
t1 := time.Unix(0, lmsg.TArrival)
t2 := time.Unix(0, lmsg.TSent)
offset := t0.Sub(t1) + t3.Sub(t2)
offset /= 2
log.Infow("time offset", "offset", offset.Seconds(), "peerid", pid.String())
}
}
}()
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return nil
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}