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signature_request.go
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signature_request.go
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// (c) 2023, Lux Partners Limited. All rights reserved.
// See the file LICENSE for licensing terms.
package handlers
import (
"context"
"time"
"github.com/luxdefi/node/codec"
"github.com/luxdefi/node/ids"
"github.com/luxdefi/node/utils/crypto/bls"
"github.com/luxdefi/subnet-evm/plugin/evm/message"
"github.com/luxdefi/subnet-evm/warp"
"github.com/ethereum/go-ethereum/log"
)
// SignatureRequestHandler serves warp signature requests. It is a peer.RequestHandler for message.MessageSignatureRequest.
type SignatureRequestHandler struct {
backend warp.Backend
codec codec.Manager
stats *handlerStats
}
func NewSignatureRequestHandler(backend warp.Backend, codec codec.Manager) *SignatureRequestHandler {
return &SignatureRequestHandler{
backend: backend,
codec: codec,
stats: newStats(),
}
}
// OnMessageSignatureRequest handles message.MessageSignatureRequest, and retrieves a warp signature for the requested message ID.
// Never returns an error
// Expects returned errors to be treated as FATAL
// Returns empty response if signature is not found
// Assumes ctx is active
func (s *SignatureRequestHandler) OnMessageSignatureRequest(ctx context.Context, nodeID ids.NodeID, requestID uint32, signatureRequest message.MessageSignatureRequest) ([]byte, error) {
startTime := time.Now()
s.stats.IncMessageSignatureRequest()
// Always report signature request time
defer func() {
s.stats.UpdateMessageSignatureRequestTime(time.Since(startTime))
}()
signature, err := s.backend.GetMessageSignature(signatureRequest.MessageID)
if err != nil {
log.Debug("Unknown warp signature requested", "messageID", signatureRequest.MessageID)
s.stats.IncMessageSignatureMiss()
signature = [bls.SignatureLen]byte{}
} else {
s.stats.IncMessageSignatureHit()
}
response := message.SignatureResponse{Signature: signature}
responseBytes, err := s.codec.Marshal(message.Version, &response)
if err != nil {
log.Error("could not marshal SignatureResponse, dropping request", "nodeID", nodeID, "requestID", requestID, "err", err)
return nil, nil
}
return responseBytes, nil
}
func (s *SignatureRequestHandler) OnBlockSignatureRequest(ctx context.Context, nodeID ids.NodeID, requestID uint32, request message.BlockSignatureRequest) ([]byte, error) {
startTime := time.Now()
s.stats.IncBlockSignatureRequest()
// Always report signature request time
defer func() {
s.stats.UpdateBlockSignatureRequestTime(time.Since(startTime))
}()
signature, err := s.backend.GetBlockSignature(request.BlockID)
if err != nil {
log.Debug("Unknown warp signature requested", "blockID", request.BlockID)
s.stats.IncBlockSignatureMiss()
signature = [bls.SignatureLen]byte{}
} else {
s.stats.IncBlockSignatureHit()
}
response := message.SignatureResponse{Signature: signature}
responseBytes, err := s.codec.Marshal(message.Version, &response)
if err != nil {
log.Error("could not marshal SignatureResponse, dropping request", "nodeID", nodeID, "requestID", requestID, "err", err)
return nil, nil
}
return responseBytes, nil
}
type NoopSignatureRequestHandler struct{}
func (s *NoopSignatureRequestHandler) OnMessageSignatureRequest(ctx context.Context, nodeID ids.NodeID, requestID uint32, signatureRequest message.MessageSignatureRequest) ([]byte, error) {
return nil, nil
}
func (s *NoopSignatureRequestHandler) OnBlockSignatureRequest(ctx context.Context, nodeID ids.NodeID, requestID uint32, signatureRequest message.BlockSignatureRequest) ([]byte, error) {
return nil, nil
}