Merge branch 'develop' into simplify-parse-beacon-block

changelog/bastin_fix-genlogs-gitignore-bug.md

@@ -1,3 +0,0 @@
-### Fixed
-
-- Fixed a bug where `cmd/beacon-chain/execution` was being ignored by `hack/gen-logs.sh` due to a `.gitignore` rule.

changelog/james-prysm_simplify-parse-beacon-block.md

@@ -0,0 +1,3 @@
+### Ignored
+
+- improving maintainability and deduplication on get and post block parsing.

cmd/beacon-chain/execution/log.go

@@ -0,0 +1,5 @@
+package execution
+
+import "github.com/sirupsen/logrus"
+
+var log = logrus.WithField("prefix", "execution")

hack/gen-logs.sh

@@ -31,11 +31,6 @@ EXCLUDED_PATH_PREFIXES=(
   ".vscode"
 )
 
-# Gitignore overrides: paths that should still be scanned even if ignored by VCS.
-GITIGNORE_OVERRIDES=(
-  "cmd/beacon-chain/execution"
-)
-
 # The logrus import path
 LOGRUS_IMPORT="github.com/sirupsen/logrus"
 # ----------------------------
@@ -75,14 +70,6 @@ rg_args=(
   -0    # NUL-delimited output
 )
 
-if [[ ${#GITIGNORE_OVERRIDES[@]} -gt 0 ]]; then
-  # Disable VCS ignores so overrides are honored.
-  rg_args+=( --no-ignore-vcs )
-  for ov in "${GITIGNORE_OVERRIDES[@]}"; do
-    rg_args+=( --glob "$ov/**" )
-  done
-fi
-
 for ex in "${EXCLUDED_PATH_PREFIXES[@]}"; do
   rg_args+=( --glob "!$ex/**" )
 done

validator/client/beacon-api/BUILD.bazel

@@ -52,6 +52,7 @@ go_library(
         "//consensus-types/primitives:go_default_library",
         "//consensus-types/validator:go_default_library",
         "//encoding/bytesutil:go_default_library",
+        "//encoding/ssz:go_default_library",
         "//monitoring/tracing/trace:go_default_library",
         "//network/httputil:go_default_library",
         "//proto/engine/v1:go_default_library",

validator/client/beacon-api/duties.go

@@ -66,12 +66,13 @@ func (c *beaconApiValidatorClient) duties(ctx context.Context, in *ethpb.DutiesR
 	}()
 
 	nextEpochDuties := &ethpb.ValidatorDutiesContainer{}
-	if err := c.dutiesForEpoch(ctx, nextEpochDuties, in.Epoch+1, vals, fetchSyncDuties); err != nil {
-		return nil, errors.Wrapf(err, "failed to get duties for next epoch `%d`", in.Epoch+1)
-	}
+	nextEpochErr := c.dutiesForEpoch(ctx, nextEpochDuties, in.Epoch+1, vals, fetchSyncDuties)
 
-	if err = <-errCh; err != nil {
-		return nil, err
+	if currEpochErr := <-errCh; currEpochErr != nil {
+		return nil, currEpochErr
+	}
+	if nextEpochErr != nil {
+		return nil, errors.Wrapf(nextEpochErr, "failed to get duties for next epoch `%d`", in.Epoch+1)
 	}
 
 	return &ethpb.ValidatorDutiesContainer{

validator/client/beacon-api/get_beacon_block.go

@@ -55,114 +55,153 @@ func (c *beaconApiValidatorClient) beaconBlock(ctx context.Context, slot primiti
 	}
 }
 
+// sszBlockCodec defines SSZ unmarshalers for a fork's block and blinded block types.
+type sszBlockCodec struct {
+	unmarshalBlock   func([]byte) (*ethpb.GenericBeaconBlock, error)
+	unmarshalBlinded func([]byte) (*ethpb.GenericBeaconBlock, error) // nil for Phase0/Altair
+}
+
+type sszCodecEntry struct {
+	minVersion int
+	codec      sszBlockCodec
+}
+
+// sszCodecs is ordered descending by version so that unknown future versions
+// fall through to the latest known fork (matching the original if-cascade).
+var sszCodecs = []sszCodecEntry{
+	{
+		minVersion: version.Fulu,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlockContentsFulu{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Fulu{Fulu: block}}, nil
+			},
+			unmarshalBlinded: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				blindedBlock := &ethpb.BlindedBeaconBlockFulu{}
+				if err := blindedBlock.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedFulu{BlindedFulu: blindedBlock}, IsBlinded: true}, nil
+			},
+		},
+	},
+	{
+		minVersion: version.Electra,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlockContentsElectra{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Electra{Electra: block}}, nil
+			},
+			unmarshalBlinded: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				blindedBlock := &ethpb.BlindedBeaconBlockElectra{}
+				if err := blindedBlock.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedElectra{BlindedElectra: blindedBlock}, IsBlinded: true}, nil
+			},
+		},
+	},
+	{
+		minVersion: version.Deneb,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlockContentsDeneb{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Deneb{Deneb: block}}, nil
+			},
+			unmarshalBlinded: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				blindedBlock := &ethpb.BlindedBeaconBlockDeneb{}
+				if err := blindedBlock.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedDeneb{BlindedDeneb: blindedBlock}, IsBlinded: true}, nil
+			},
+		},
+	},
+	{
+		minVersion: version.Capella,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlockCapella{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Capella{Capella: block}}, nil
+			},
+			unmarshalBlinded: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				blindedBlock := &ethpb.BlindedBeaconBlockCapella{}
+				if err := blindedBlock.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedCapella{BlindedCapella: blindedBlock}, IsBlinded: true}, nil
+			},
+		},
+	},
+	{
+		minVersion: version.Bellatrix,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlockBellatrix{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Bellatrix{Bellatrix: block}}, nil
+			},
+			unmarshalBlinded: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				blindedBlock := &ethpb.BlindedBeaconBlockBellatrix{}
+				if err := blindedBlock.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedBellatrix{BlindedBellatrix: blindedBlock}, IsBlinded: true}, nil
+			},
+		},
+	},
+	{
+		minVersion: version.Altair,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlockAltair{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Altair{Altair: block}}, nil
+			},
+		},
+	},
+	{
+		minVersion: version.Phase0,
+		codec: sszBlockCodec{
+			unmarshalBlock: func(data []byte) (*ethpb.GenericBeaconBlock, error) {
+				block := &ethpb.BeaconBlock{}
+				if err := block.UnmarshalSSZ(data); err != nil {
+					return nil, err
+				}
+				return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Phase0{Phase0: block}}, nil
+			},
+		},
+	},
+}
+
 func processBlockSSZResponse(ver int, data []byte, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if ver >= version.Fulu {
-		return processBlockSSZResponseFulu(data, isBlinded)
-	}
-	if ver >= version.Electra {
-		return processBlockSSZResponseElectra(data, isBlinded)
-	}
-	if ver >= version.Deneb {
-		return processBlockSSZResponseDeneb(data, isBlinded)
-	}
-	if ver >= version.Capella {
-		return processBlockSSZResponseCapella(data, isBlinded)
-	}
-	if ver >= version.Bellatrix {
-		return processBlockSSZResponseBellatrix(data, isBlinded)
-	}
-	if ver >= version.Altair {
-		block := &ethpb.BeaconBlockAltair{}
-		if err := block.UnmarshalSSZ(data); err != nil {
-			return nil, err
+	for _, entry := range sszCodecs {
+		if ver >= entry.minVersion {
+			if isBlinded && entry.codec.unmarshalBlinded != nil {
+				return entry.codec.unmarshalBlinded(data)
+			}
+			return entry.codec.unmarshalBlock(data)
 		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Altair{Altair: block}}, nil
-	}
-	if ver >= version.Phase0 {
-		block := &ethpb.BeaconBlock{}
-		if err := block.UnmarshalSSZ(data); err != nil {
-			return nil, err
-		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Phase0{Phase0: block}}, nil
 	}
 	return nil, fmt.Errorf("unsupported block version %s", version.String(ver))
 }
 
-func processBlockSSZResponseFulu(data []byte, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		blindedBlock := &ethpb.BlindedBeaconBlockFulu{}
-		if err := blindedBlock.UnmarshalSSZ(data); err != nil {
-			return nil, err
-		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedFulu{BlindedFulu: blindedBlock}, IsBlinded: true}, nil
-	}
-	block := &ethpb.BeaconBlockContentsFulu{}
-	if err := block.UnmarshalSSZ(data); err != nil {
-		return nil, err
-	}
-	return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Fulu{Fulu: block}}, nil
-}
-
-func processBlockSSZResponseElectra(data []byte, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		blindedBlock := &ethpb.BlindedBeaconBlockElectra{}
-		if err := blindedBlock.UnmarshalSSZ(data); err != nil {
-			return nil, err
-		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedElectra{BlindedElectra: blindedBlock}, IsBlinded: true}, nil
-	}
-	block := &ethpb.BeaconBlockContentsElectra{}
-	if err := block.UnmarshalSSZ(data); err != nil {
-		return nil, err
-	}
-	return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Electra{Electra: block}}, nil
-}
-
-func processBlockSSZResponseDeneb(data []byte, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		blindedBlock := &ethpb.BlindedBeaconBlockDeneb{}
-		if err := blindedBlock.UnmarshalSSZ(data); err != nil {
-			return nil, err
-		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedDeneb{BlindedDeneb: blindedBlock}, IsBlinded: true}, nil
-	}
-	block := &ethpb.BeaconBlockContentsDeneb{}
-	if err := block.UnmarshalSSZ(data); err != nil {
-		return nil, err
-	}
-	return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Deneb{Deneb: block}}, nil
-}
-
-func processBlockSSZResponseCapella(data []byte, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		blindedBlock := &ethpb.BlindedBeaconBlockCapella{}
-		if err := blindedBlock.UnmarshalSSZ(data); err != nil {
-			return nil, err
-		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedCapella{BlindedCapella: blindedBlock}, IsBlinded: true}, nil
-	}
-	block := &ethpb.BeaconBlockCapella{}
-	if err := block.UnmarshalSSZ(data); err != nil {
-		return nil, err
-	}
-	return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Capella{Capella: block}}, nil
-}
-
-func processBlockSSZResponseBellatrix(data []byte, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		blindedBlock := &ethpb.BlindedBeaconBlockBellatrix{}
-		if err := blindedBlock.UnmarshalSSZ(data); err != nil {
-			return nil, err
-		}
-		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedBellatrix{BlindedBellatrix: blindedBlock}, IsBlinded: true}, nil
-	}
-	block := &ethpb.BeaconBlockBellatrix{}
-	if err := block.UnmarshalSSZ(data); err != nil {
-		return nil, err
-	}
-	return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Bellatrix{Bellatrix: block}}, nil
-}
-
 func convertBlockToGeneric(decoder *json.Decoder, dest ethpb.GenericConverter, version string, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
 	typeName := version
 	if isBlinded {
@@ -180,69 +219,52 @@ func convertBlockToGeneric(decoder *json.Decoder, dest ethpb.GenericConverter, v
 	return genericBlock, nil
 }
 
+// jsonBlockTypes defines factory functions for creating block and blinded block structs for JSON decoding.
+type jsonBlockTypes struct {
+	newBlock   func() ethpb.GenericConverter
+	newBlinded func() ethpb.GenericConverter // nil for Phase0/Altair
+}
+
+var jsonBlockFactories = map[string]jsonBlockTypes{
+	version.String(version.Phase0): {
+		newBlock: func() ethpb.GenericConverter { return &structs.BeaconBlock{} },
+	},
+	version.String(version.Altair): {
+		newBlock: func() ethpb.GenericConverter { return &structs.BeaconBlockAltair{} },
+	},
+	version.String(version.Bellatrix): {
+		newBlock:   func() ethpb.GenericConverter { return &structs.BeaconBlockBellatrix{} },
+		newBlinded: func() ethpb.GenericConverter { return &structs.BlindedBeaconBlockBellatrix{} },
+	},
+	version.String(version.Capella): {
+		newBlock:   func() ethpb.GenericConverter { return &structs.BeaconBlockCapella{} },
+		newBlinded: func() ethpb.GenericConverter { return &structs.BlindedBeaconBlockCapella{} },
+	},
+	version.String(version.Deneb): {
+		newBlock:   func() ethpb.GenericConverter { return &structs.BeaconBlockContentsDeneb{} },
+		newBlinded: func() ethpb.GenericConverter { return &structs.BlindedBeaconBlockDeneb{} },
+	},
+	version.String(version.Electra): {
+		newBlock:   func() ethpb.GenericConverter { return &structs.BeaconBlockContentsElectra{} },
+		newBlinded: func() ethpb.GenericConverter { return &structs.BlindedBeaconBlockElectra{} },
+	},
+	version.String(version.Fulu): {
+		newBlock:   func() ethpb.GenericConverter { return &structs.BeaconBlockContentsFulu{} },
+		newBlinded: func() ethpb.GenericConverter { return &structs.BlindedBeaconBlockFulu{} },
+	},
+}
+
 func processBlockJSONResponse(ver string, isBlinded bool, decoder *json.Decoder) (*ethpb.GenericBeaconBlock, error) {
 	if decoder == nil {
 		return nil, errors.New("no produce block json decoder found")
 	}
 
-	switch ver {
-	case version.String(version.Phase0):
-		return convertBlockToGeneric(decoder, &structs.BeaconBlock{}, version.String(version.Phase0), false)
-
-	case version.String(version.Altair):
-		return convertBlockToGeneric(decoder, &structs.BeaconBlockAltair{}, "altair", false)
-
-	case version.String(version.Bellatrix):
-		return processBellatrixBlock(decoder, isBlinded)
-
-	case version.String(version.Capella):
-		return processCapellaBlock(decoder, isBlinded)
-
-	case version.String(version.Deneb):
-		return processDenebBlock(decoder, isBlinded)
-
-	case version.String(version.Electra):
-		return processElectraBlock(decoder, isBlinded)
-
-	case version.String(version.Fulu):
-		return processFuluBlock(decoder, isBlinded)
-
-	default:
+	factory, ok := jsonBlockFactories[ver]
+	if !ok {
 		return nil, errors.Errorf("unsupported consensus version `%s`", ver)
 	}
-}
-
-func processBellatrixBlock(decoder *json.Decoder, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		return convertBlockToGeneric(decoder, &structs.BlindedBeaconBlockBellatrix{}, "bellatrix", true)
+	if isBlinded && factory.newBlinded != nil {
+		return convertBlockToGeneric(decoder, factory.newBlinded(), ver, true)
 	}
-	return convertBlockToGeneric(decoder, &structs.BeaconBlockBellatrix{}, "bellatrix", false)
-}
-
-func processCapellaBlock(decoder *json.Decoder, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		return convertBlockToGeneric(decoder, &structs.BlindedBeaconBlockCapella{}, "capella", true)
-	}
-	return convertBlockToGeneric(decoder, &structs.BeaconBlockCapella{}, "capella", false)
-}
-
-func processDenebBlock(decoder *json.Decoder, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		return convertBlockToGeneric(decoder, &structs.BlindedBeaconBlockDeneb{}, "deneb", true)
-	}
-	return convertBlockToGeneric(decoder, &structs.BeaconBlockContentsDeneb{}, "deneb", false)
-}
-
-func processElectraBlock(decoder *json.Decoder, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		return convertBlockToGeneric(decoder, &structs.BlindedBeaconBlockElectra{}, "electra", true)
-	}
-	return convertBlockToGeneric(decoder, &structs.BeaconBlockContentsElectra{}, "electra", false)
-}
-
-func processFuluBlock(decoder *json.Decoder, isBlinded bool) (*ethpb.GenericBeaconBlock, error) {
-	if isBlinded {
-		return convertBlockToGeneric(decoder, &structs.BlindedBeaconBlockFulu{}, "fulu", true)
-	}
-	return convertBlockToGeneric(decoder, &structs.BeaconBlockContentsFulu{}, "fulu", false)
+	return convertBlockToGeneric(decoder, factory.newBlock(), ver, false)
 }

validator/client/beacon-api/get_beacon_block_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/OffchainLabs/prysm/v7/api/server/structs"
 	"github.com/OffchainLabs/prysm/v7/consensus-types/primitives"
 	ethpb "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v7/runtime/version"
 	"github.com/OffchainLabs/prysm/v7/testing/assert"
 	"github.com/OffchainLabs/prysm/v7/testing/require"
 	"github.com/OffchainLabs/prysm/v7/validator/client/beacon-api/mock"
@@ -25,7 +26,7 @@ func TestGetBeaconBlock_RequestFailed(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		gomock.Any(),
@@ -149,7 +150,7 @@ func TestGetBeaconBlock_Error(t *testing.T) {
 
 			b, err := json.Marshal(resp)
 			require.NoError(t, err)
-			handler := mock.NewMockJsonRestHandler(ctrl)
+			handler := mock.NewMockHandler(ctrl)
 			handler.EXPECT().GetSSZ(
 				gomock.Any(),
 				gomock.Any(),
@@ -185,7 +186,7 @@ func TestGetBeaconBlock_Phase0Valid(t *testing.T) {
 		Data:    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -208,6 +209,25 @@ func TestGetBeaconBlock_Phase0Valid(t *testing.T) {
 	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
 }
 
+func TestSSZCodecs_OrderAndCoverage(t *testing.T) {
+	versions := version.All()
+	require.NotEmpty(t, versions)
+
+	expected := make([]int, 0, len(versions))
+	for i := len(versions) - 1; i >= 0; i-- {
+		expected = append(expected, versions[i])
+	}
+
+	require.Equal(t, len(expected), len(sszCodecs))
+
+	for i, entry := range sszCodecs {
+		assert.Equal(t, expected[i], entry.minVersion, "sszCodecs[%d] has wrong fork order", i)
+		if i > 0 {
+			require.Equal(t, true, entry.minVersion < sszCodecs[i-1].minVersion, "sszCodecs not strictly descending at index %d", i)
+		}
+	}
+}
+
 // Add SSZ test cases below this line
 
 func TestGetBeaconBlock_SSZ_BellatrixValid(t *testing.T) {
@@ -224,7 +244,7 @@ func TestGetBeaconBlock_SSZ_BellatrixValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -266,7 +286,7 @@ func TestGetBeaconBlock_SSZ_BlindedBellatrixValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -308,7 +328,7 @@ func TestGetBeaconBlock_SSZ_CapellaValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -350,7 +370,7 @@ func TestGetBeaconBlock_SSZ_BlindedCapellaValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -392,7 +412,7 @@ func TestGetBeaconBlock_SSZ_DenebValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -434,7 +454,7 @@ func TestGetBeaconBlock_SSZ_BlindedDenebValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -476,7 +496,7 @@ func TestGetBeaconBlock_SSZ_ElectraValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -518,7 +538,7 @@ func TestGetBeaconBlock_SSZ_BlindedElectraValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -546,6 +566,90 @@ func TestGetBeaconBlock_SSZ_BlindedElectraValid(t *testing.T) {
 	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
 }
 
+func TestGetBeaconBlock_SSZ_FuluValid(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	proto := testhelpers.GenerateProtoFuluBeaconBlockContents()
+	bytes, err := proto.MarshalSSZ()
+	require.NoError(t, err)
+
+	const slot = primitives.Slot(1)
+	randaoReveal := []byte{2}
+	graffiti := []byte{3}
+
+	ctx := t.Context()
+
+	handler := mock.NewMockHandler(ctrl)
+	handler.EXPECT().GetSSZ(
+		gomock.Any(),
+		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
+	).Return(
+		bytes,
+		http.Header{
+			"Content-Type":                    []string{api.OctetStreamMediaType},
+			api.VersionHeader:                 []string{"fulu"},
+			api.ExecutionPayloadBlindedHeader: []string{"false"},
+		},
+		nil,
+	).Times(1)
+
+	validatorClient := &beaconApiValidatorClient{handler: handler}
+	beaconBlock, err := validatorClient.beaconBlock(ctx, slot, randaoReveal, graffiti)
+	require.NoError(t, err)
+
+	expectedBeaconBlock := &ethpb.GenericBeaconBlock{
+		Block: &ethpb.GenericBeaconBlock_Fulu{
+			Fulu: proto,
+		},
+		IsBlinded: false,
+	}
+
+	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
+}
+
+func TestGetBeaconBlock_SSZ_BlindedFuluValid(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	proto := testhelpers.GenerateProtoBlindedFuluBeaconBlock()
+	bytes, err := proto.MarshalSSZ()
+	require.NoError(t, err)
+
+	const slot = primitives.Slot(1)
+	randaoReveal := []byte{2}
+	graffiti := []byte{3}
+
+	ctx := t.Context()
+
+	handler := mock.NewMockHandler(ctrl)
+	handler.EXPECT().GetSSZ(
+		gomock.Any(),
+		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
+	).Return(
+		bytes,
+		http.Header{
+			"Content-Type":                    []string{api.OctetStreamMediaType},
+			api.VersionHeader:                 []string{"fulu"},
+			api.ExecutionPayloadBlindedHeader: []string{"true"},
+		},
+		nil,
+	).Times(1)
+
+	validatorClient := &beaconApiValidatorClient{handler: handler}
+	beaconBlock, err := validatorClient.beaconBlock(ctx, slot, randaoReveal, graffiti)
+	require.NoError(t, err)
+
+	expectedBeaconBlock := &ethpb.GenericBeaconBlock{
+		Block: &ethpb.GenericBeaconBlock_BlindedFulu{
+			BlindedFulu: proto,
+		},
+		IsBlinded: true,
+	}
+
+	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
+}
+
 func TestGetBeaconBlock_SSZ_UnsupportedVersion(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -556,7 +660,7 @@ func TestGetBeaconBlock_SSZ_UnsupportedVersion(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -589,7 +693,7 @@ func TestGetBeaconBlock_SSZ_InvalidBlindedHeader(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -622,7 +726,7 @@ func TestGetBeaconBlock_SSZ_InvalidVersionHeader(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -651,7 +755,7 @@ func TestGetBeaconBlock_SSZ_GetSSZError(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -680,7 +784,7 @@ func TestGetBeaconBlock_SSZ_Phase0Valid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -722,7 +826,7 @@ func TestGetBeaconBlock_SSZ_AltairValid(t *testing.T) {
 
 	ctx := t.Context()
 
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -770,7 +874,7 @@ func TestGetBeaconBlock_AltairValid(t *testing.T) {
 		Data:    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -814,7 +918,7 @@ func TestGetBeaconBlock_BellatrixValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -859,7 +963,7 @@ func TestGetBeaconBlock_BlindedBellatrixValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -904,7 +1008,7 @@ func TestGetBeaconBlock_CapellaValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -949,7 +1053,7 @@ func TestGetBeaconBlock_BlindedCapellaValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -973,6 +1077,96 @@ func TestGetBeaconBlock_BlindedCapellaValid(t *testing.T) {
 	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
 }
 
+func TestGetBeaconBlock_FuluValid(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	proto := testhelpers.GenerateProtoFuluBeaconBlockContents()
+	block := testhelpers.GenerateJsonFuluBeaconBlockContents()
+	bytes, err := json.Marshal(block)
+	require.NoError(t, err)
+
+	const slot = primitives.Slot(1)
+	randaoReveal := []byte{2}
+	graffiti := []byte{3}
+
+	ctx := t.Context()
+
+	b, err := json.Marshal(structs.ProduceBlockV3Response{
+		Version:                 "fulu",
+		ExecutionPayloadBlinded: false,
+		Data:                    bytes,
+	})
+	require.NoError(t, err)
+	handler := mock.NewMockHandler(ctrl)
+	handler.EXPECT().GetSSZ(
+		gomock.Any(),
+		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
+	).Return(
+		b,
+		http.Header{"Content-Type": []string{"application/json"}},
+		nil,
+	).Times(1)
+
+	validatorClient := &beaconApiValidatorClient{handler: handler}
+	beaconBlock, err := validatorClient.beaconBlock(ctx, slot, randaoReveal, graffiti)
+	require.NoError(t, err)
+
+	expectedBeaconBlock := &ethpb.GenericBeaconBlock{
+		Block: &ethpb.GenericBeaconBlock_Fulu{
+			Fulu: proto,
+		},
+		IsBlinded: false,
+	}
+
+	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
+}
+
+func TestGetBeaconBlock_BlindedFuluValid(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	proto := testhelpers.GenerateProtoBlindedFuluBeaconBlock()
+	block := testhelpers.GenerateJsonBlindedFuluBeaconBlock()
+	bytes, err := json.Marshal(block)
+	require.NoError(t, err)
+
+	const slot = primitives.Slot(1)
+	randaoReveal := []byte{2}
+	graffiti := []byte{3}
+
+	ctx := t.Context()
+
+	b, err := json.Marshal(structs.ProduceBlockV3Response{
+		Version:                 "fulu",
+		ExecutionPayloadBlinded: true,
+		Data:                    bytes,
+	})
+	require.NoError(t, err)
+	handler := mock.NewMockHandler(ctrl)
+	handler.EXPECT().GetSSZ(
+		gomock.Any(),
+		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
+	).Return(
+		b,
+		http.Header{"Content-Type": []string{"application/json"}},
+		nil,
+	).Times(1)
+
+	validatorClient := &beaconApiValidatorClient{handler: handler}
+	beaconBlock, err := validatorClient.beaconBlock(ctx, slot, randaoReveal, graffiti)
+	require.NoError(t, err)
+
+	expectedBeaconBlock := &ethpb.GenericBeaconBlock{
+		Block: &ethpb.GenericBeaconBlock_BlindedFulu{
+			BlindedFulu: proto,
+		},
+		IsBlinded: true,
+	}
+
+	assert.DeepEqual(t, expectedBeaconBlock, beaconBlock)
+}
+
 func TestGetBeaconBlock_DenebValid(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -994,7 +1188,7 @@ func TestGetBeaconBlock_DenebValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -1039,7 +1233,7 @@ func TestGetBeaconBlock_BlindedDenebValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -1084,7 +1278,7 @@ func TestGetBeaconBlock_ElectraValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),
@@ -1129,7 +1323,7 @@ func TestGetBeaconBlock_BlindedElectraValid(t *testing.T) {
 		Data:                    bytes,
 	})
 	require.NoError(t, err)
-	handler := mock.NewMockJsonRestHandler(ctrl)
+	handler := mock.NewMockHandler(ctrl)
 	handler.EXPECT().GetSSZ(
 		gomock.Any(),
 		fmt.Sprintf("/eth/v3/validator/blocks/%d?graffiti=%s&randao_reveal=%s", slot, hexutil.Encode(graffiti), hexutil.Encode(randaoReveal)),

validator/client/beacon-api/propose_beacon_block.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 
 	"github.com/OffchainLabs/prysm/v7/api/server/structs"
+	"github.com/OffchainLabs/prysm/v7/encoding/ssz"
 	"github.com/OffchainLabs/prysm/v7/network/httputil"
 	ethpb "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
 	"github.com/pkg/errors"
@@ -21,34 +22,128 @@ type blockProcessingResult struct {
 	marshalJSON func() ([]byte, error)
 }
 
+type sszMarshaler interface {
+	MarshalSSZ() ([]byte, error)
+}
+
+func buildBlockResult(
+	versionName string,
+	blinded bool,
+	sszObj sszMarshaler,
+	rootObj ssz.Hashable,
+	jsonFn func() ([]byte, error),
+) (*blockProcessingResult, error) {
+	beaconBlockRoot, err := rootObj.HashTreeRoot()
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to compute block root for %s beacon block", versionName)
+	}
+
+	marshaledSSZ, err := sszObj.MarshalSSZ()
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to serialize %s beacon block", versionName)
+	}
+
+	return &blockProcessingResult{
+		consensusVersion: versionName,
+		blinded:          blinded,
+		beaconBlockRoot:  beaconBlockRoot,
+		marshalledSSZ:    marshaledSSZ,
+		marshalJSON:      jsonFn,
+	}, nil
+}
+
 func (c *beaconApiValidatorClient) proposeBeaconBlock(ctx context.Context, in *ethpb.GenericSignedBeaconBlock) (*ethpb.ProposeResponse, error) {
 	var res *blockProcessingResult
 	var err error
 	switch blockType := in.Block.(type) {
 	case *ethpb.GenericSignedBeaconBlock_Phase0:
-		res, err = handlePhase0Block(blockType)
+		res, err = buildBlockResult("phase0", false, blockType.Phase0, blockType.Phase0.Block, func() ([]byte, error) {
+			return json.Marshal(structs.SignedBeaconBlockPhase0FromConsensus(blockType.Phase0))
+		})
 	case *ethpb.GenericSignedBeaconBlock_Altair:
-		res, err = handleAltairBlock(blockType)
+		res, err = buildBlockResult("altair", false, blockType.Altair, blockType.Altair.Block, func() ([]byte, error) {
+			return json.Marshal(structs.SignedBeaconBlockAltairFromConsensus(blockType.Altair))
+		})
 	case *ethpb.GenericSignedBeaconBlock_Bellatrix:
-		res, err = handleBellatrixBlock(blockType)
+		res, err = buildBlockResult("bellatrix", false, blockType.Bellatrix, blockType.Bellatrix.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBeaconBlockBellatrixFromConsensus(blockType.Bellatrix)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert bellatrix beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_BlindedBellatrix:
-		res, err = handleBlindedBellatrixBlock(blockType)
+		res, err = buildBlockResult("bellatrix", true, blockType.BlindedBellatrix, blockType.BlindedBellatrix.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBlindedBeaconBlockBellatrixFromConsensus(blockType.BlindedBellatrix)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert blinded bellatrix beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_Capella:
-		res, err = handleCapellaBlock(blockType)
+		res, err = buildBlockResult("capella", false, blockType.Capella, blockType.Capella.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBeaconBlockCapellaFromConsensus(blockType.Capella)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert capella beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_BlindedCapella:
-		res, err = handleBlindedCapellaBlock(blockType)
+		res, err = buildBlockResult("capella", true, blockType.BlindedCapella, blockType.BlindedCapella.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBlindedBeaconBlockCapellaFromConsensus(blockType.BlindedCapella)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert blinded capella beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_Deneb:
-		res, err = handleDenebBlockContents(blockType)
+		res, err = buildBlockResult("deneb", false, blockType.Deneb, blockType.Deneb.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBeaconBlockContentsDenebFromConsensus(blockType.Deneb)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert deneb beacon block contents")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_BlindedDeneb:
-		res, err = handleBlindedDenebBlock(blockType)
+		res, err = buildBlockResult("deneb", true, blockType.BlindedDeneb, blockType.BlindedDeneb, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBlindedBeaconBlockDenebFromConsensus(blockType.BlindedDeneb)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert deneb blinded beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_Electra:
-		res, err = handleElectraBlockContents(blockType)
+		res, err = buildBlockResult("electra", false, blockType.Electra, blockType.Electra.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBeaconBlockContentsElectraFromConsensus(blockType.Electra)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert electra beacon block contents")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_BlindedElectra:
-		res, err = handleBlindedElectraBlock(blockType)
+		res, err = buildBlockResult("electra", true, blockType.BlindedElectra, blockType.BlindedElectra, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBlindedBeaconBlockElectraFromConsensus(blockType.BlindedElectra)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert electra blinded beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_Fulu:
-		res, err = handleFuluBlockContents(blockType)
+		res, err = buildBlockResult("fulu", false, blockType.Fulu, blockType.Fulu.Block, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBeaconBlockContentsFuluFromConsensus(blockType.Fulu)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert fulu beacon block contents")
+			}
+			return json.Marshal(signedBlock)
+		})
 	case *ethpb.GenericSignedBeaconBlock_BlindedFulu:
-		res, err = handleBlindedFuluBlock(blockType)
+		res, err = buildBlockResult("fulu", true, blockType.BlindedFulu, blockType.BlindedFulu, func() ([]byte, error) {
+			signedBlock, err := structs.SignedBlindedBeaconBlockFuluFromConsensus(blockType.BlindedFulu)
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to convert fulu blinded beacon block")
+			}
+			return json.Marshal(signedBlock)
+		})
 	default:
 		return nil, errors.Errorf("unsupported block type %T", in.Block)
 	}
@@ -116,357 +211,3 @@ func (c *beaconApiValidatorClient) proposeBeaconBlock(ctx context.Context, in *e
 
 	return &ethpb.ProposeResponse{BlockRoot: res.beaconBlockRoot[:]}, nil
 }
-
-func handlePhase0Block(block *ethpb.GenericSignedBeaconBlock_Phase0) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "phase0"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Phase0.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for phase0 beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Phase0.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize block for phase0 beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock := structs.SignedBeaconBlockPhase0FromConsensus(block.Phase0)
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleAltairBlock(block *ethpb.GenericSignedBeaconBlock_Altair) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "altair"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Altair.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for altair beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Altair.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize block for altair beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock := structs.SignedBeaconBlockAltairFromConsensus(block.Altair)
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleBellatrixBlock(block *ethpb.GenericSignedBeaconBlock_Bellatrix) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "bellatrix"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Bellatrix.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for bellatrix beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Bellatrix.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize block for bellatrix beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBeaconBlockBellatrixFromConsensus(block.Bellatrix)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert bellatrix beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleBlindedBellatrixBlock(block *ethpb.GenericSignedBeaconBlock_BlindedBellatrix) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "bellatrix"
-	res.blinded = true
-
-	beaconBlockRoot, err := block.BlindedBellatrix.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for bellatrix beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.BlindedBellatrix.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize block for bellatrix beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBlindedBeaconBlockBellatrixFromConsensus(block.BlindedBellatrix)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert blinded bellatrix beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleCapellaBlock(block *ethpb.GenericSignedBeaconBlock_Capella) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "capella"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Capella.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for capella beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Capella.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize capella beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBeaconBlockCapellaFromConsensus(block.Capella)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert capella beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleBlindedCapellaBlock(block *ethpb.GenericSignedBeaconBlock_BlindedCapella) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "capella"
-	res.blinded = true
-
-	beaconBlockRoot, err := block.BlindedCapella.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for blinded capella beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.BlindedCapella.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize blinded capella beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBlindedBeaconBlockCapellaFromConsensus(block.BlindedCapella)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert blinded capella beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleDenebBlockContents(block *ethpb.GenericSignedBeaconBlock_Deneb) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "deneb"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Deneb.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for deneb beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Deneb.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize deneb beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBeaconBlockContentsDenebFromConsensus(block.Deneb)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert deneb beacon block contents")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleBlindedDenebBlock(block *ethpb.GenericSignedBeaconBlock_BlindedDeneb) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "deneb"
-	res.blinded = true
-
-	beaconBlockRoot, err := block.BlindedDeneb.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for deneb blinded beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.BlindedDeneb.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize blinded deneb  beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBlindedBeaconBlockDenebFromConsensus(block.BlindedDeneb)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert deneb blinded beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleElectraBlockContents(block *ethpb.GenericSignedBeaconBlock_Electra) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "electra"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Electra.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for electra beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Electra.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize electra beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBeaconBlockContentsElectraFromConsensus(block.Electra)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert electra beacon block contents")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleBlindedElectraBlock(block *ethpb.GenericSignedBeaconBlock_BlindedElectra) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "electra"
-	res.blinded = true
-
-	beaconBlockRoot, err := block.BlindedElectra.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for electra blinded beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.BlindedElectra.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize blinded electra beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBlindedBeaconBlockElectraFromConsensus(block.BlindedElectra)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert electra blinded beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleFuluBlockContents(block *ethpb.GenericSignedBeaconBlock_Fulu) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "fulu"
-	res.blinded = false
-
-	beaconBlockRoot, err := block.Fulu.Block.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for fulu beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.Fulu.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize fulu beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBeaconBlockContentsFuluFromConsensus(block.Fulu)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert fulu beacon block contents")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}
-
-func handleBlindedFuluBlock(block *ethpb.GenericSignedBeaconBlock_BlindedFulu) (*blockProcessingResult, error) {
-	var res blockProcessingResult
-	res.consensusVersion = "fulu"
-	res.blinded = true
-
-	beaconBlockRoot, err := block.BlindedFulu.HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to compute block root for fulu blinded beacon block")
-	}
-	res.beaconBlockRoot = beaconBlockRoot
-
-	// Marshal SSZ
-	ssz, err := block.BlindedFulu.MarshalSSZ()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to serialize blinded fulu beacon block")
-	}
-	res.marshalledSSZ = ssz
-
-	// Set up JSON marshalling function for fallback
-	res.marshalJSON = func() ([]byte, error) {
-		signedBlock, err := structs.SignedBlindedBeaconBlockFuluFromConsensus(block.BlindedFulu)
-		if err != nil {
-			return nil, errors.Wrap(err, "failed to convert fulu blinded beacon block")
-		}
-		return json.Marshal(signedBlock)
-	}
-
-	return &res, nil
-}

validator/client/beacon-api/propose_beacon_block_test.go

@@ -620,6 +620,42 @@ func TestProposeBeaconBlock_SSZFails_406_FallbackToJSON(t *testing.T) {
 	}
 }
 
+func TestProposeBeaconBlock_SSZFails_406_JSONFallbackFails(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	ctx := t.Context()
+	handler := mock.NewMockHandler(ctrl)
+
+	handler.EXPECT().PostSSZ(
+		gomock.Any(),
+		"/eth/v2/beacon/blocks",
+		gomock.Any(),
+		gomock.Any(),
+	).Return(
+		nil, nil, &httputil.DefaultJsonError{
+			Code:    http.StatusNotAcceptable,
+			Message: "SSZ not supported",
+		},
+	).Times(1)
+
+	handler.EXPECT().Post(
+		gomock.Any(),
+		"/eth/v2/beacon/blocks",
+		gomock.Any(),
+		gomock.Any(),
+		nil,
+	).Return(
+		errors.New("json fallback failed"),
+	).Times(1)
+
+	validatorClient := &beaconApiValidatorClient{handler: handler}
+	_, err := validatorClient.proposeBeaconBlock(ctx, &ethpb.GenericSignedBeaconBlock{
+		Block: generateSignedPhase0Block(),
+	})
+	assert.ErrorContains(t, "failed to submit block via JSON fallback", err)
+}
+
 func TestProposeBeaconBlock_SSZFails_Non406_NoFallback(t *testing.T) {
 	testCases := []struct {
 		name             string
@@ -676,3 +712,41 @@ func TestProposeBeaconBlock_SSZFails_Non406_NoFallback(t *testing.T) {
 		})
 	}
 }
+
+type badHashable struct{}
+
+func (badHashable) HashTreeRoot() ([32]byte, error) {
+	return [32]byte{}, errors.New("hash root error")
+}
+
+type badMarshaler struct{}
+
+func (badMarshaler) MarshalSSZ() ([]byte, error) {
+	return nil, errors.New("marshal ssz error")
+}
+
+type okMarshaler struct{}
+
+func (okMarshaler) MarshalSSZ() ([]byte, error) {
+	return []byte{1, 2, 3}, nil
+}
+
+type okHashable struct{}
+
+func (okHashable) HashTreeRoot() ([32]byte, error) {
+	return [32]byte{1}, nil
+}
+
+func TestBuildBlockResult_HashTreeRootError(t *testing.T) {
+	_, err := buildBlockResult("phase0", false, okMarshaler{}, badHashable{}, func() ([]byte, error) {
+		return []byte(`{}`), nil
+	})
+	assert.ErrorContains(t, "failed to compute block root for phase0 beacon block", err)
+}
+
+func TestBuildBlockResult_MarshalSSZError(t *testing.T) {
+	_, err := buildBlockResult("phase0", false, badMarshaler{}, okHashable{}, func() ([]byte, error) {
+		return []byte(`{}`), nil
+	})
+	assert.ErrorContains(t, "failed to serialize phase0 beacon block", err)
+}

validator/client/beacon-api/test-helpers/BUILD.bazel

@@ -9,6 +9,7 @@ go_library(
         "capella_beacon_block_test_helpers.go",
         "deneb_beacon_block_test_helpers.go",
         "electra_beacon_block_test_helpers.go",
+        "fulu_beacon_block_test_helpers.go",
         "phase0_beacon_block_test_helpers.go",
         "test_helpers.go",
     ],

validator/client/beacon-api/test-helpers/fulu_beacon_block_test_helpers.go

@@ -0,0 +1,46 @@
+package test_helpers
+
+import (
+	"github.com/OffchainLabs/prysm/v7/api/server/structs"
+	ethpb "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
+)
+
+func GenerateProtoFuluBeaconBlockContents() *ethpb.BeaconBlockContentsFulu {
+	electra := GenerateProtoElectraBeaconBlockContents()
+	return &ethpb.BeaconBlockContentsFulu{
+		Block:     electra.Block,
+		KzgProofs: electra.KzgProofs,
+		Blobs:     electra.Blobs,
+	}
+}
+
+func GenerateProtoBlindedFuluBeaconBlock() *ethpb.BlindedBeaconBlockFulu {
+	electra := GenerateProtoBlindedElectraBeaconBlock()
+	return &ethpb.BlindedBeaconBlockFulu{
+		Slot:          electra.Slot,
+		ProposerIndex: electra.ProposerIndex,
+		ParentRoot:    electra.ParentRoot,
+		StateRoot:     electra.StateRoot,
+		Body:          electra.Body,
+	}
+}
+
+func GenerateJsonFuluBeaconBlockContents() *structs.BeaconBlockContentsFulu {
+	electra := GenerateJsonElectraBeaconBlockContents()
+	return &structs.BeaconBlockContentsFulu{
+		Block:     electra.Block,
+		KzgProofs: electra.KzgProofs,
+		Blobs:     electra.Blobs,
+	}
+}
+
+func GenerateJsonBlindedFuluBeaconBlock() *structs.BlindedBeaconBlockFulu {
+	electra := GenerateJsonBlindedElectraBeaconBlock()
+	return &structs.BlindedBeaconBlockFulu{
+		Slot:          electra.Slot,
+		ProposerIndex: electra.ProposerIndex,
+		ParentRoot:    electra.ParentRoot,
+		StateRoot:     electra.StateRoot,
+		Body:          electra.Body,
+	}
+}