Add support for Fulu (#805)

Author: bharath-123

common/common.go

@@ -10,6 +10,17 @@ import (
 
 const (
 	SlotTimeSecMainnet = 12
+	// FieldElementsPerBlob is the number of field elements needed to represent a blob.
+	FieldElementsPerBlob = 4096
+	// BlobExpansionFactor is the factor by which we extend a blob for PeerDAS.
+	BlobExpansionFactor = 2
+	// FieldElementsPerCell is the number of field elements in a cell.
+	FieldElementsPerCell = 64
+	BytesPerFieldElement = 32
+	// FieldElementsPerExtBlob is the number of field elements needed to represent an extended blob.
+	FieldElementsPerExtBlob = FieldElementsPerBlob * BlobExpansionFactor
+	// CellsPerExtBlob is the number of cells in an extended blob.
+	CellsPerExtBlob = FieldElementsPerExtBlob / FieldElementsPerCell
 )
 
 func GetEnv(key, defaultValue string) string {

go.mod

@@ -37,7 +37,7 @@ require (
 
 require (
 	github.com/attestantio/go-builder-client v0.6.1
-	github.com/attestantio/go-eth2-client v0.25.0
+	github.com/attestantio/go-eth2-client v0.25.1-0.20250603135601-6ac0bfda7fda
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
 	github.com/ferranbt/fastssz v0.1.4 // indirect
@@ -60,3 +60,5 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+replace github.com/attestantio/go-builder-client => github.com/jtraglia/go-builder-client v0.4.6-0.20250410195459-42a3ff7f1546

go.sum

@@ -1,9 +1,7 @@
 github.com/VictoriaMetrics/fastcache v1.12.2 h1:N0y9ASrJ0F6h0QaC3o6uJb3NIZ9VKLjCM7NQbSmF7WI=
 github.com/VictoriaMetrics/fastcache v1.12.2/go.mod h1:AmC+Nzz1+3G2eCPapF6UcsnkThDcMsQicp4xDukwJYI=
-github.com/attestantio/go-builder-client v0.6.1 h1:fn6PC8aDWx2YbptstR1JKP8NyakiNJJTiOE5f9N0z5Q=
-github.com/attestantio/go-builder-client v0.6.1/go.mod h1:f8wi3HzuPxfJoi2PirpJK3yZhte4SavDgKJbRrKoB1Q=
-github.com/attestantio/go-eth2-client v0.25.0 h1:wLQxoteGCbTE/vKCMASx1ze+Zm9rcqtltRnblaLJup4=
-github.com/attestantio/go-eth2-client v0.25.0/go.mod h1:fvULSL9WtNskkOB4i+Yyr6BKpNHXvmpGZj9969fCrfY=
+github.com/attestantio/go-eth2-client v0.25.1-0.20250603135601-6ac0bfda7fda h1:Wc7YGICtTWKNZvMjpIN/l6HKTj9POEU9N67NIWWWOk0=
+github.com/attestantio/go-eth2-client v0.25.1-0.20250603135601-6ac0bfda7fda/go.mod h1:fvULSL9WtNskkOB4i+Yyr6BKpNHXvmpGZj9969fCrfY=
 github.com/bits-and-blooms/bitset v1.22.0 h1:Tquv9S8+SGaS3EhyA+up3FXzmkhxPGjQQCkcs2uw7w4=
 github.com/bits-and-blooms/bitset v1.22.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
@@ -59,6 +57,8 @@ github.com/huandu/go-clone v1.7.2 h1:3+Aq0Ed8XK+zKkLjE2dfHg0XrpIfcohBE1K+c8Usxoo
 github.com/huandu/go-clone v1.7.2/go.mod h1:ReGivhG6op3GYr+UY3lS6mxjKp7MIGTknuU5TbTVaXE=
 github.com/huandu/go-clone/generic v1.6.0 h1:Wgmt/fUZ28r16F2Y3APotFD59sHk1p78K0XLdbUYN5U=
 github.com/huandu/go-clone/generic v1.6.0/go.mod h1:xgd9ZebcMsBWWcBx5mVMCoqMX24gLWr5lQicr+nVXNs=
+github.com/jtraglia/go-builder-client v0.4.6-0.20250410195459-42a3ff7f1546 h1:UnMUnbUz6fiJ1Ox7hNMkAS6T+Vcdy2qjo9q2D3q8zqg=
+github.com/jtraglia/go-builder-client v0.4.6-0.20250410195459-42a3ff7f1546/go.mod h1:3Z2KfjbuX2EmJajEmDb3I/JdDqzlm4WsojnCugO0oM0=
 github.com/klauspost/cpuid/v2 v2.2.10 h1:tBs3QSyvjDyFTq3uoc/9xFpCuOsJQFNPiAhYdw2skhE=
 github.com/klauspost/cpuid/v2 v2.2.10/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=

server/constants.go

@@ -17,4 +17,5 @@ const (
 	EthConsensusVersionCapella   = "capella"
 	EthConsensusVersionDeneb     = "deneb"
 	EthConsensusVersionElectra   = "electra"
+	EthConsensusVersionFulu      = "fulu"
 )

server/get_header.go

@@ -279,6 +279,10 @@ func decodeBid(respBytes []byte, respContentType, ethConsensusVersion string, bi
 				bid.Version = spec.DataVersionElectra
 				bid.Electra = new(builderApiElectra.SignedBuilderBid)
 				return bid.Electra.UnmarshalSSZ(respBytes)
+			case EthConsensusVersionFulu:
+				bid.Version = spec.DataVersionFulu
+				bid.Fulu = new(builderApiElectra.SignedBuilderBid)
+				return bid.Fulu.UnmarshalSSZ(respBytes)
 			default:
 				return errInvalidForkVersion
 			}
@@ -322,6 +326,9 @@ func (m *BoostService) respondGetHeaderSSZ(w http.ResponseWriter, result *bidRes
 	case spec.DataVersionElectra:
 		w.Header().Set(HeaderEthConsensusVersion, EthConsensusVersionElectra)
 		sszData, err = result.response.Electra.MarshalSSZ()
+	case spec.DataVersionFulu:
+		w.Header().Set(HeaderEthConsensusVersion, EthConsensusVersionFulu)
+		sszData, err = result.response.Fulu.MarshalSSZ()
 	case spec.DataVersionUnknown, spec.DataVersionPhase0, spec.DataVersionAltair:
 		err = errInvalidForkVersion
 	}