chore(builder): store decoded constraints in the cache

builder/builder/builder.go

@@ -97,8 +97,8 @@ type Builder struct {
 	builderResubmitInterval     time.Duration
 	discardRevertibleTxOnErr    bool
 
-	// constraintsCache is a map from slot to the constraints made by proposers
-	constraintsCache *shardmap.FIFOMap[uint64, common.SignedConstraintsList]
+	// constraintsCache is a map from slot to the decoded constraints made by proposers
+	constraintsCache *shardmap.FIFOMap[uint64, types.HashToConstraintDecoded]
 
 	limiter                       *rate.Limiter
 	submissionOffsetFromEndOfSlot time.Duration
@@ -196,7 +196,7 @@ func NewBuilder(args BuilderArgs) (*Builder, error) {
 		discardRevertibleTxOnErr:      args.discardRevertibleTxOnErr,
 		submissionOffsetFromEndOfSlot: args.submissionOffsetFromEndOfSlot,
 
-		constraintsCache: shardmap.NewFIFOMap[uint64, common.SignedConstraintsList](64, 16, shardmap.HashUint64),
+		constraintsCache: shardmap.NewFIFOMap[uint64, types.HashToConstraintDecoded](64, 16, shardmap.HashUint64),
 
 		limiter:       args.limiter,
 		slotCtx:       slotCtx,
@@ -343,9 +343,11 @@ func (b *Builder) subscribeToRelayForConstraints(relayBaseEndpoint, authHeader s
 			}
 			log.Error("Error reading from response body: %v", err)
 		}
+
 		if !strings.HasPrefix(line, "data: ") {
 			continue
 		}
+
 		data := strings.TrimPrefix(line, "data: ")
 
 		// We assume the data is the JSON representation of the constraints
@@ -355,49 +357,57 @@ func (b *Builder) subscribeToRelayForConstraints(relayBaseEndpoint, authHeader s
 			log.Warn(fmt.Sprintf("Failed to unmarshal constraints: %v", err))
 			continue
 		}
+
 		if len(constraintsSigned) == 0 {
 			log.Warn("Received 0 length list of constraints")
 			continue
 		}
 
 	OUTER:
 		for _, constraint := range constraintsSigned {
+			decodedConstraints, err := DecodeConstraint(constraint)
+			if err != nil {
+				log.Error("Failed to decode transaction RLP: ", err)
+				continue
+			}
+
 			// For every constraint, we need to check if it has already been seen for the associated slot
 			slotConstraints, _ := b.constraintsCache.Get(constraint.Message.Slot)
 			if len(slotConstraints) == 0 {
 				// New constraint for this slot, add it in the map and continue with the next constraint
-				b.constraintsCache.Put(constraint.Message.Slot, common.SignedConstraintsList{constraint})
+				b.constraintsCache.Put(constraint.Message.Slot, decodedConstraints)
 				continue
 			}
-			for _, slotConstraint := range slotConstraints {
-				if slotConstraint.Signature == constraint.Signature {
-					// The constraint has already been seen, we can continue with the next one
-					continue OUTER
+
+			// Temporary map to keep track of the constraints that are already in the slot
+			seenTx := make(map[common.Hash]bool)
+			for hash := range slotConstraints {
+				seenTx[hash] = true
+			}
+
+			isNewConstraint := false
+			for hash := range decodedConstraints {
+				if !seenTx[hash] {
+					// The constraint is new, we will add this to the slot constraints
+					isNewConstraint = true
+					slotConstraints[hash] = decodedConstraints[hash]
 				}
 			}
+
+			if !isNewConstraint {
+				continue OUTER
+			}
+
 			// The constraint is new, we need to append it to the current list
-			b.constraintsCache.Put(constraint.Message.Slot, append(slotConstraints, constraint))
+			b.constraintsCache.Put(constraint.Message.Slot, slotConstraints)
 		}
 	}
 
 	return nil
 }
 
 func (b *Builder) GetConstraintsForSlot(slot uint64) types.HashToConstraintDecoded {
-	constraintsDecoded := make(types.HashToConstraintDecoded)
-	constraintsSigned, _ := b.constraintsCache.Get(slot)
-
-	for _, constraintSigned := range constraintsSigned {
-		constraints := constraintSigned.Message.Constraints
-		for _, constraint := range constraints {
-			decoded := new(types.Transaction)
-			if err := decoded.UnmarshalBinary(constraint.Tx); err != nil {
-				log.Error("Failed to decode preconfirmation transaction RLP: ", err)
-				continue
-			}
-			constraintsDecoded[decoded.Hash()] = &types.ConstraintDecoded{Index: constraint.Index, Tx: decoded}
-		}
-	}
+	constraintsDecoded, _ := b.constraintsCache.Get(slot)
 	return constraintsDecoded
 }
 

builder/builder/builder_test.go

@@ -627,12 +627,12 @@ func TestSubscribeProposerConstraints(t *testing.T) {
 	time.Sleep(2 * time.Second)
 
 	slots := []uint64{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
-	for slot := range slots {
-		slot := uint64(slot)
+	for _, slot := range slots {
 		constraints, ok := builder.constraintsCache.Get(slot)
-		expected := generateMockConstraintsForSlot(slot)[0].Message.Constraints[0].Tx
-		actual := constraints[0].Message.Constraints[0].Tx
-		require.Equal(t, expected, actual)
+		expected := generateMockConstraintsForSlot(slot)[0]
+		decoded, _ := DecodeConstraint(expected)
+		// actual := constraints[0].Message.Constraints[0].Tx
+		require.Equal(t, constraints, decoded)
 		require.Equal(t, true, ok)
 	}
 }

builder/builder/utils.go

@@ -9,10 +9,25 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 )
 
 var errHTTPErrorResponse = errors.New("HTTP error response")
 
+func DecodeConstraint(constraint *common.SignedConstraints) (types.HashToConstraintDecoded, error) {
+	decodedConstraints := make(types.HashToConstraintDecoded)
+	for _, tx := range constraint.Message.Constraints {
+		decoded := new(types.Transaction)
+		if err := decoded.UnmarshalBinary(tx.Tx); err != nil {
+			return nil, err
+		}
+		decodedConstraints[decoded.Hash()] = &types.ConstraintDecoded{Index: tx.Index, Tx: decoded}
+	}
+	return decodedConstraints, nil
+}
+
 // SendSSZRequest is a request to send SSZ data to a remote relay.
 func SendSSZRequest(ctx context.Context, client http.Client, method, url string, payload []byte, useGzip bool) (code int, err error) {
 	var req *http.Request

builder/go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/btcsuite/btcd/btcec/v2 v2.2.1
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/cespare/cp v0.1.0
+	github.com/chainbound/shardmap v0.0.2
 	github.com/cloudflare/cloudflare-go v0.79.0
 	github.com/cockroachdb/pebble v0.0.0-20230928194634-aa077af62593
 	github.com/consensys/gnark-crypto v0.12.1
@@ -39,6 +40,7 @@ require (
 	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb
 	github.com/google/gofuzz v1.2.0
 	github.com/google/uuid v1.3.0
+	github.com/gorilla/handlers v1.5.2
 	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/websocket v1.4.2
 	github.com/grafana/pyroscope-go/godeltaprof v0.1.7
@@ -84,11 +86,9 @@ require (
 )
 
 require (
-	github.com/chainbound/shardmap v0.0.2 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/getsentry/sentry-go v0.18.0 // indirect
 	github.com/goccy/go-yaml v1.11.2 // indirect
-	github.com/gorilla/handlers v1.5.2 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.5 // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/naoina/go-stringutil v0.1.0 // indirect
@@ -150,7 +150,7 @@ require (
 	github.com/mmcloughlin/addchain v0.4.0 // indirect
 	github.com/naoina/toml v0.1.1
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pkg/errors v0.9.1
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_golang v1.16.0 // indirect
 	github.com/prometheus/client_model v0.3.0 // indirect