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p2p.go
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p2p.go
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package ccq
import (
"bytes"
"context"
"encoding/hex"
"fmt"
"net/http"
"time"
"github.com/certusone/wormhole/node/pkg/p2p"
gossipv1 "github.com/certusone/wormhole/node/pkg/proto/gossip/v1"
"github.com/certusone/wormhole/node/pkg/query"
ethCommon "github.com/ethereum/go-ethereum/common"
ethCrypto "github.com/ethereum/go-ethereum/crypto"
pubsub "github.com/libp2p/go-libp2p-pubsub"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/host"
"github.com/wormhole-foundation/wormhole/sdk/vaa"
"go.uber.org/zap"
"google.golang.org/protobuf/proto"
)
type GuardianSignature struct {
Index int
Signature string
}
type SignedResponse struct {
Response *query.QueryResponsePublication
Signatures []GuardianSignature
}
type P2PSub struct {
sub *pubsub.Subscription
topic_req *pubsub.Topic
topic_resp *pubsub.Topic
host host.Host
}
func runP2P(
ctx context.Context,
priv crypto.PrivKey,
port uint,
networkID string,
bootstrapPeers string,
ethRpcUrl string,
ethCoreAddr string,
pendingResponses *PendingResponses,
logger *zap.Logger,
monitorPeers bool,
loggingMap *LoggingMap,
gossipAdvertiseAddress string,
) (*P2PSub, error) {
// p2p setup
components := p2p.DefaultComponents()
components.Port = port
components.GossipAdvertiseAddress = gossipAdvertiseAddress
h, err := p2p.NewHost(logger, ctx, networkID, bootstrapPeers, components, priv)
if err != nil {
return nil, err
}
topic_req := fmt.Sprintf("%s/%s", networkID, "ccq_req")
topic_resp := fmt.Sprintf("%s/%s", networkID, "ccq_resp")
logger.Info("Subscribing pubsub topic", zap.String("topic_req", topic_req), zap.String("topic_resp", topic_resp))
// Comment from security team in PR #2981: CCQServers should have a parameter of D = 36, Dlo = 19, Dhi = 40, Dout = 18 such that they can reach all Guardians directly.
gossipParams := pubsub.DefaultGossipSubParams()
gossipParams.D = 36
gossipParams.Dlo = 19
gossipParams.Dhi = 40
gossipParams.Dout = 18
ps, err := pubsub.NewGossipSub(ctx, h, pubsub.WithGossipSubParams(gossipParams))
if err != nil {
logger.Error("failed to create gossip subscription", zap.Error(err))
return nil, err
}
th_req, err := ps.Join(topic_req)
if err != nil {
logger.Error("failed to join request topic", zap.String("topic_req", topic_req), zap.Error(err))
return nil, err
}
th_resp, err := ps.Join(topic_resp)
if err != nil {
logger.Error("failed to join response topic", zap.String("topic_resp", topic_resp), zap.Error(err))
return nil, err
}
sub, err := th_resp.Subscribe()
if err != nil {
logger.Error("failed to subscribe to response topic", zap.Error(err))
return nil, err
}
logger.Info("Node has been started", zap.String("peer_id", h.ID().String()),
zap.String("addrs", fmt.Sprintf("%v", h.Addrs())))
bootstrappers, _ := p2p.BootstrapAddrs(logger, bootstrapPeers, h.ID())
successes := p2p.ConnectToPeers(ctx, logger, h, bootstrappers)
logger.Info("Connected to bootstrap peers", zap.Int("num", successes))
// Wait for peers
for len(th_req.ListPeers()) < 1 {
time.Sleep(time.Millisecond * 100)
}
logger.Info("Found peers", zap.Int("numPeers", len(th_req.ListPeers())))
if monitorPeers {
logger.Info("Will monitor for missing peers once per minute.")
go func() {
t := time.NewTicker(time.Minute)
for {
select {
case <-ctx.Done():
logger.Info("Context cancelled, exiting peer monitoring.")
case <-t.C:
peers := th_req.ListPeers()
logger.Info("current peers", zap.Int("numPeers", len(peers)), zap.Any("peers", peers))
peerMap := map[string]struct{}{}
for _, peer := range peers {
peerMap[peer.String()] = struct{}{}
}
for _, p := range bootstrappers {
if _, exists := peerMap[p.ID.String()]; !exists {
logger.Info("attempting to reconnect to peer", zap.String("peer", p.ID.String()))
if err := h.Connect(ctx, p); err != nil {
logger.Error("failed to reconnect to peer", zap.String("peer", p.ID.String()), zap.Error(err))
} else {
logger.Info("Reconnected to peer", zap.String("peer", p.ID.String()))
peerMap[p.ID.String()] = struct{}{}
successfulReconnects.Inc()
}
}
}
}
}
}()
}
// Fetch the initial current guardian set
guardianSet, err := FetchCurrentGuardianSet(ethRpcUrl, ethCoreAddr)
if err != nil {
logger.Fatal("Failed to fetch current guardian set", zap.Error(err))
}
quorum := vaa.CalculateQuorum(len(guardianSet.Keys))
// Listen to the p2p network for query responses
go func() {
// Maps the request signature to a map of response digests which maps to a list of guardian signatures.
// A request could have responses with different digests, because the guardians could have
// different results returned for the query in the event of a rollback.
responses := make(map[string]map[ethCommon.Hash][]GuardianSignature)
for {
envelope, err := sub.Next(ctx)
if err != nil {
logger.Error("Failed to read next pubsub message", zap.Error(err))
return
}
var msg gossipv1.GossipMessage
err = proto.Unmarshal(envelope.Data, &msg)
if err != nil {
logger.Error("received invalid message", zap.Binary("data", envelope.Data), zap.String("from", envelope.GetFrom().String()))
inboundP2pError.WithLabelValues("failed_to_unmarshal_gossip_msg").Inc()
continue
}
switch m := msg.Message.(type) {
case *gossipv1.GossipMessage_SignedQueryResponse:
logger.Debug("query response received", zap.Any("response", m.SignedQueryResponse))
peerId := envelope.GetFrom().String()
queryResponsesReceived.WithLabelValues(peerId).Inc()
var queryResponse query.QueryResponsePublication
err := queryResponse.Unmarshal(m.SignedQueryResponse.QueryResponse)
if err != nil {
logger.Error("failed to unmarshal response", zap.Error(err))
inboundP2pError.WithLabelValues("failed_to_unmarshal_response").Inc()
continue
}
for _, pcr := range queryResponse.PerChainResponses {
queryResponsesReceivedByChainAndPeerID.WithLabelValues(pcr.ChainId.String(), peerId).Inc()
}
requestSignature := hex.EncodeToString(queryResponse.Request.Signature)
logger.Info("query response received from gossip", zap.String("peerId", peerId), zap.Any("requestId", requestSignature))
if loggingMap.ShouldLogResponse(requestSignature) {
var queryRequest query.QueryRequest
if err := queryRequest.Unmarshal(queryResponse.Request.QueryRequest); err == nil {
logger.Info("logging response", zap.String("peerId", peerId), zap.Any("requestId", requestSignature), zap.Any("request", queryRequest), zap.Any("response", queryResponse))
} else {
logger.Error("logging response (failed to unmarshal request)", zap.String("peerId", peerId), zap.Any("requestId", requestSignature), zap.Any("response", queryResponse))
}
}
// Check that we're handling the request for this response
pendingResponse := pendingResponses.Get(requestSignature)
if pendingResponse == nil {
// This will happen for responses that come in after quorum is reached.
logger.Debug("skipping query response for unknown request", zap.String("signature", requestSignature))
continue
}
// Make sure that the request bytes match
if !bytes.Equal(queryResponse.Request.QueryRequest, pendingResponse.req.QueryRequest) ||
!bytes.Equal(queryResponse.Request.Signature, pendingResponse.req.Signature) {
continue
}
digest := query.GetQueryResponseDigestFromBytes(m.SignedQueryResponse.QueryResponse)
signerBytes, err := ethCrypto.Ecrecover(digest.Bytes(), m.SignedQueryResponse.Signature)
if err != nil {
logger.Error("failed to verify signature on response",
zap.String("digest", digest.Hex()),
zap.String("signature", hex.EncodeToString(m.SignedQueryResponse.Signature)),
zap.Error(err))
inboundP2pError.WithLabelValues("failed_to_verify_signature").Inc()
continue
}
signerAddress := ethCommon.BytesToAddress(ethCrypto.Keccak256(signerBytes[1:])[12:])
keyIdx, hasKeyIdx := guardianSet.KeyIndex(signerAddress)
if hasKeyIdx {
if _, ok := responses[requestSignature]; !ok {
responses[requestSignature] = make(map[ethCommon.Hash][]GuardianSignature)
}
found := false
for _, gs := range responses[requestSignature][digest] {
if gs.Index == keyIdx {
found = true
break
}
}
if found {
// Already handled the response from this guardian
continue
}
responses[requestSignature][digest] = append(responses[requestSignature][digest], GuardianSignature{
Index: keyIdx,
Signature: hex.EncodeToString(m.SignedQueryResponse.Signature),
})
// quorum is reached when a super-majority of guardians have signed a response with the same digest
numSigners := len(responses[requestSignature][digest])
if numSigners >= quorum {
s := &SignedResponse{
Response: &queryResponse,
Signatures: responses[requestSignature][digest],
}
delete(responses, requestSignature)
select {
case pendingResponse.ch <- s:
logger.Info("quorum reached, forwarded query response",
zap.String("peerId", peerId),
zap.String("userId", pendingResponse.userName),
zap.Any("requestId", requestSignature),
zap.Int("numSigners", numSigners),
zap.Int("quorum", quorum),
)
default:
logger.Error("failed to write query response to channel, dropping it", zap.String("peerId", peerId), zap.Any("requestId", requestSignature))
// Leave the request in the pending map. It will get cleaned up if it times out.
}
} else {
// Proxy should return early if quorum is no longer possible - i.e maxMatchingResponses + outstandingResponses < quorum
var totalSigners, maxMatchingResponses int
for _, signers := range responses[requestSignature] {
totalSigners += len(signers)
if len(signers) > maxMatchingResponses {
maxMatchingResponses = len(signers)
}
}
outstandingResponses := len(guardianSet.Keys) - totalSigners
if maxMatchingResponses+outstandingResponses < quorum {
quorumNotMetByUser.WithLabelValues(pendingResponse.userName).Inc()
failedQueriesByUser.WithLabelValues(pendingResponse.userName).Inc()
delete(responses, requestSignature)
select {
case pendingResponse.errCh <- &ErrorEntry{err: fmt.Errorf("quorum not met"), status: http.StatusBadRequest}:
logger.Info("query failed, quorum not met",
zap.String("peerId", peerId),
zap.String("userId", pendingResponse.userName),
zap.Any("requestId", requestSignature),
zap.Int("numSigners", numSigners),
zap.Int("maxMatchingResponses", maxMatchingResponses),
zap.Int("outstandingResponses", outstandingResponses),
zap.Int("quorum", quorum),
)
default:
logger.Error("failed to write query error response to channel, dropping it", zap.String("peerId", peerId), zap.Any("requestId", requestSignature))
// Leave the request in the pending map. It will get cleaned up if it times out.
}
} else {
logger.Info("waiting for more query responses",
zap.String("peerId", peerId),
zap.String("userId", pendingResponse.userName),
zap.Any("requestId", requestSignature),
zap.Int("numSigners", numSigners),
zap.Int("maxMatchingResponses", maxMatchingResponses),
zap.Int("outstandingResponses", outstandingResponses),
zap.Int("quorum", quorum),
)
}
}
} else {
logger.Warn("received observation by unknown guardian - is our guardian set outdated?",
zap.String("digest", digest.Hex()), zap.String("address", signerAddress.Hex()),
)
inboundP2pError.WithLabelValues("unknown_guardian").Inc()
}
default:
// Since CCQ gossip is isolated, this really shouldn't happen.
logger.Debug("unexpected gossip message type", zap.Any("msg", m))
inboundP2pError.WithLabelValues("unexpected_gossip_msg_type").Inc()
}
}
}()
return &P2PSub{
sub: sub,
topic_req: th_req,
topic_resp: th_resp,
host: h,
}, nil
}