Add Gloas fork support

.golangci.yml

@@ -22,7 +22,7 @@ linters:
     - tparallel
     - unconvert
     - whitespace
-    - wsl
+    - wsl_v5
   settings:
     errcheck:
       check-type-assertions: true
@@ -39,6 +39,10 @@ linters:
     nolintlint:
       require-explanation: true
       require-specific: true
+    wsl_v5:
+      allow-first-in-block: true
+      allow-whole-block: false
+      branch-max-lines: 2
   exclusions:
     generated: lax
     presets:

cmd/root.go

@@ -54,7 +54,6 @@ func loadConfigFromFile(file string) (*checkpointz.Config, error) {
 	}
 
 	yamlFile, err := os.ReadFile(file)
-
 	if err != nil {
 		return nil, err
 	}

go.mod

@@ -2,6 +2,8 @@ module github.com/ethpandaops/checkpointz
 
 go 1.25.1
 
+replace github.com/attestantio/go-eth2-client => github.com/pk910/go-eth2-client v0.0.0-20260105163749-315f81992d43
+
 require (
 	github.com/attestantio/go-eth2-client v0.27.2
 	github.com/chuckpreslar/emission v0.0.0-20170206194824-a7ddd980baf9
@@ -79,7 +81,6 @@ require (
 	golang.org/x/text v0.31.0 // indirect
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
 	google.golang.org/protobuf v1.36.8 // indirect
-	gopkg.in/Knetic/govaluate.v3 v3.0.0 // indirect
 	gopkg.in/cenkalti/backoff.v1 v1.1.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,7 +1,5 @@
 github.com/OffchainLabs/hashtree v0.2.1-0.20250530191054-577f0b75c7f7 h1:0r1HjExe/tyypkt380UTpjvILd5kLw51Xzl6a+hknQ8=
 github.com/OffchainLabs/hashtree v0.2.1-0.20250530191054-577f0b75c7f7/go.mod h1:b07+cRZs+eAR8TR57CB9TQlt5Gnl/06Xs76xt/1wq0M=
-github.com/attestantio/go-eth2-client v0.27.2 h1:VjA9R39ovy8ryb7IpFfD5eLYBg/20biztxh6fKZ7/K0=
-github.com/attestantio/go-eth2-client v0.27.2/go.mod h1:i56XBegxVt7wXupnLBOj9IyGwy5cqaoTsCSKlwTubEU=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/casbin/govaluate v1.8.0 h1:1dUaV/I0LFP2tcY1uNQEb6wBCbp8GMTcC/zhwQDWvZo=
@@ -26,10 +24,6 @@ github.com/emicklei/dot v1.6.4 h1:cG9ycT67d9Yw22G+mAb4XiuUz6E6H1S0zePp/5Cwe/c=
 github.com/emicklei/dot v1.6.4/go.mod h1:DeV7GvQtIw4h2u73RKBkkFdvVAz0D9fzeJrgPW6gy/s=
 github.com/ethereum/go-ethereum v1.16.4 h1:H6dU0r2p/amA7cYg6zyG9Nt2JrKKH6oX2utfcqrSpkQ=
 github.com/ethereum/go-ethereum v1.16.4/go.mod h1:P7551slMFbjn2zOQaKrJShZVN/d8bGxp4/I6yZVlb5w=
-github.com/ethpandaops/beacon v0.65.0 h1:ssnab73uiuzhmhtU56q9D3ecVrEYv5n+tuqrXRK4YAg=
-github.com/ethpandaops/beacon v0.65.0/go.mod h1:lgzrJjQVV77wZ+PJymsY3bQbAK4jrtP8n3WOwMf1Pcs=
-github.com/ethpandaops/beacon v0.65.1-0.20251204024030-639105ffe6c2 h1:WU40omAqHrPF/Mfovc9+eMCrTAl8Km/KOanyYqr3SBg=
-github.com/ethpandaops/beacon v0.65.1-0.20251204024030-639105ffe6c2/go.mod h1:lgzrJjQVV77wZ+PJymsY3bQbAK4jrtP8n3WOwMf1Pcs=
 github.com/ethpandaops/beacon v0.66.0 h1:BRnf4yTEzkZwHW6sTp1x+mBoO5pwbQOX6wtLt3Nh1Y4=
 github.com/ethpandaops/beacon v0.66.0/go.mod h1:lgzrJjQVV77wZ+PJymsY3bQbAK4jrtP8n3WOwMf1Pcs=
 github.com/ethpandaops/ethwallclock v0.2.0 h1:EeFKtZ7v6TAdn/oAh0xaPujD7N4amjBxrWIByraUfLM=
@@ -160,10 +154,10 @@ github.com/onsi/ginkgo v1.14.0/go.mod h1:iSB4RoI2tjJc9BBv4NKIKWKya62Rps+oPG/Lv9k
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.10.1 h1:o0+MgICZLuZ7xjH7Vx6zS/zcu93/BEp1VwkIW1mEXCE=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
-github.com/pk910/dynamic-ssz v0.0.4 h1:DT29+1055tCEPCaR4V/ez+MOKW7BzBsmjyFvBRqx0ME=
-github.com/pk910/dynamic-ssz v0.0.4/go.mod h1:b6CrLaB2X7pYA+OSEEbkgXDEcRnjLOZIxZTsMuO/Y9c=
 github.com/pk910/dynamic-ssz v1.1.1 h1:b8sPR8fyhBvz8SHa2RH20SNtt5VDzAEY6fKsPCUcYX4=
 github.com/pk910/dynamic-ssz v1.1.1/go.mod h1:3zyemisUysY2PWACZ8LeZS2tAw8AkuTb2GaLmqYsg1I=
+github.com/pk910/go-eth2-client v0.0.0-20260105163749-315f81992d43 h1:/IpWWFnimzNdpoGenmPVq6BD8y5POquB+rV9WGZ0FTo=
+github.com/pk910/go-eth2-client v0.0.0-20260105163749-315f81992d43/go.mod h1:fvULSL9WtNskkOB4i+Yyr6BKpNHXvmpGZj9969fCrfY=
 github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -290,8 +284,6 @@ google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQ
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
 google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
-gopkg.in/Knetic/govaluate.v3 v3.0.0 h1:18mUyIt4ZlRlFZAAfVetz4/rzlJs9yhN+U02F4u1AOc=
-gopkg.in/Knetic/govaluate.v3 v3.0.0/go.mod h1:csKLBORsPbafmSCGTEh3U7Ozmsuq8ZSIlKk1bcqph0E=
 gopkg.in/cenkalti/backoff.v1 v1.1.0 h1:Arh75ttbsvlpVA7WtVpH4u9h6Zl46xuptxqLxPiSo4Y=
 gopkg.in/cenkalti/backoff.v1 v1.1.0/go.mod h1:J6Vskwqd+OMVJl8C33mmtxTBs2gyzfv7UDAkHu8BrjI=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

pkg/beacon/default.go

@@ -750,6 +750,7 @@ func (d *Default) ListFinalizedSlots(ctx context.Context) ([]phase0.Slot, error)
 
 	latestSlot := phase0.Slot(uint64(finality.Finalized.Epoch) * uint64(sp.SlotsPerEpoch))
 
+	//nolint:gosec // HistoricalEpochCount is validated as positive in config.
 	for i, val := uint64(latestSlot), uint64(latestSlot)-uint64(sp.SlotsPerEpoch)*uint64(d.config.HistoricalEpochCount); i > val; i -= uint64(sp.SlotsPerEpoch) {
 		slots = append(slots, phase0.Slot(i))
 	}

pkg/beacon/download.go

@@ -173,13 +173,13 @@ func (d *Default) fetchHistoricalCheckpoints(ctx context.Context, checkpoint *v1
 	// We'll derive the current finalized slot and then work back in intervals of SLOTS_PER_EPOCH.
 	currentSlot := uint64(checkpoint.Finalized.Epoch) * uint64(sp.SlotsPerEpoch)
 	for i := 1; i < d.config.HistoricalEpochCount; i++ {
+		//nolint:gosec // i starts at 1 and increments, always positive.
 		if uint64(i)*uint64(sp.SlotsPerEpoch) > currentSlot {
 			break
 		}
 
-		slot := phase0.Slot(currentSlot - uint64(i)*uint64(sp.SlotsPerEpoch))
-
-		slotsInScope[slot] = struct{}{}
+		//nolint:gosec // i starts at 1 and increments, always positive.
+		slotsInScope[phase0.Slot(currentSlot-uint64(i)*uint64(sp.SlotsPerEpoch))] = struct{}{}
 	}
 
 	for slot := range slotsInScope {
@@ -354,7 +354,9 @@ func (d *Default) fetchBundle(ctx context.Context, root phase0.Root, upstream *N
 		if denebFork.Active(epoch) {
 			// Check if Fulu is active - if so, don't fetch blobs as they're no longer in blocks
 			fuluFork, fuluErr := sp.ForkEpochs.GetByName("fulu")
-			if fuluErr == nil && fuluFork != nil && fuluFork.Active(epoch) {
+			fuluActive := fuluErr == nil && fuluFork != nil && fuluFork.Active(epoch)
+
+			if fuluActive {
 				d.log.WithField("epoch", epoch).Debug("Skipping blob sidecar download - Fulu fork active")
 			} else {
 				// Download and store blob sidecars

pkg/beacon/expire_test.go

@@ -13,10 +13,12 @@ var (
 )
 
 func CalculateSlotExpiration(slot phase0.Slot, slotsOfHistory int) phase0.Slot {
+	//nolint:gosec // slotsOfHistory is a small positive test value
 	return slot + phase0.Slot(slotsOfHistory)
 }
 
 func GetSlotTime(slot phase0.Slot, secondsPerSlot time.Duration, genesis time.Time) time.Time {
+	//nolint:gosec // slot values are within safe range for time.Duration
 	return genesis.Add(time.Duration(slot) * secondsPerSlot)
 }
 

pkg/beacon/ssz/encoder.go

@@ -45,6 +45,25 @@ func (e *Encoder) SetSpec(newSpec *state.Spec) {
 	e.dynssz = nil
 }
 
+func (e *Encoder) marshalSSZ(obj sszutils.FastsszMarshaler) ([]byte, error) {
+	var (
+		ssz []byte
+		err error
+	)
+
+	if e.customPreset {
+		ssz, err = e.getDynamicSSZ().MarshalSSZ(obj)
+	} else {
+		ssz, err = obj.MarshalSSZ()
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return ssz, nil
+}
+
 func (e *Encoder) GetBlockRoot(block *spec.VersionedSignedBeaconBlock) (root phase0.Root, err error) {
 	var blockObj sszutils.FastsszHashRoot
 
@@ -63,6 +82,8 @@ func (e *Encoder) GetBlockRoot(block *spec.VersionedSignedBeaconBlock) (root pha
 		blockObj = block.Electra.Message
 	case spec.DataVersionFulu:
 		blockObj = block.Fulu.Message
+	case spec.DataVersionGloas:
+		blockObj = block.Gloas.Message
 	default:
 		return phase0.Root{}, errors.New("unknown block version")
 	}
@@ -80,7 +101,7 @@ func (e *Encoder) GetBlockRoot(block *spec.VersionedSignedBeaconBlock) (root pha
 	return root, nil
 }
 
-func (e *Encoder) EncodeBlockSSZ(block *spec.VersionedSignedBeaconBlock) (ssz []byte, err error) {
+func (e *Encoder) EncodeBlockSSZ(block *spec.VersionedSignedBeaconBlock) ([]byte, error) {
 	var blockObj sszutils.FastsszMarshaler
 
 	switch block.Version {
@@ -98,21 +119,13 @@ func (e *Encoder) EncodeBlockSSZ(block *spec.VersionedSignedBeaconBlock) (ssz []
 		blockObj = block.Electra
 	case spec.DataVersionFulu:
 		blockObj = block.Fulu
+	case spec.DataVersionGloas:
+		blockObj = block.Gloas
 	default:
 		return nil, errors.New("unknown block version")
 	}
 
-	if e.customPreset {
-		ssz, err = e.getDynamicSSZ().MarshalSSZ(blockObj)
-	} else {
-		ssz, err = blockObj.MarshalSSZ()
-	}
-
-	if err != nil {
-		return nil, err
-	}
-
-	return ssz, nil
+	return e.marshalSSZ(blockObj)
 }
 
 func (e *Encoder) EncodeBlockJSON(block *spec.VersionedSignedBeaconBlock) ([]byte, error) {
@@ -133,6 +146,8 @@ func (e *Encoder) EncodeBlockJSON(block *spec.VersionedSignedBeaconBlock) ([]byt
 		blockObj = block.Electra
 	case spec.DataVersionFulu:
 		blockObj = block.Fulu
+	case spec.DataVersionGloas:
+		blockObj = block.Gloas
 	default:
 		return nil, errors.New("unknown block version")
 	}
@@ -163,6 +178,8 @@ func (e *Encoder) GetStateRoot(beaconState *spec.VersionedBeaconState) (root pha
 		stateObj = beaconState.Electra
 	case spec.DataVersionFulu:
 		stateObj = beaconState.Fulu
+	case spec.DataVersionGloas:
+		stateObj = beaconState.Gloas
 	default:
 		return phase0.Root{}, errors.New("unknown state version")
 	}
@@ -179,7 +196,7 @@ func (e *Encoder) GetStateRoot(beaconState *spec.VersionedBeaconState) (root pha
 
 	return root, nil
 }
-func (e *Encoder) EncodeStateSSZ(beaconState *spec.VersionedBeaconState) (ssz []byte, err error) {
+func (e *Encoder) EncodeStateSSZ(beaconState *spec.VersionedBeaconState) ([]byte, error) {
 	var stateObj sszutils.FastsszMarshaler
 
 	switch beaconState.Version {
@@ -197,19 +214,11 @@ func (e *Encoder) EncodeStateSSZ(beaconState *spec.VersionedBeaconState) (ssz []
 		stateObj = beaconState.Electra
 	case spec.DataVersionFulu:
 		stateObj = beaconState.Fulu
+	case spec.DataVersionGloas:
+		stateObj = beaconState.Gloas
 	default:
 		return nil, errors.New("unknown state version")
 	}
 
-	if e.customPreset {
-		ssz, err = e.getDynamicSSZ().MarshalSSZ(stateObj)
-	} else {
-		ssz, err = stateObj.MarshalSSZ()
-	}
-
-	if err != nil {
-		return nil, err
-	}
-
-	return ssz, nil
+	return e.marshalSSZ(stateObj)
 }

pkg/cache/ttl.go

@@ -40,6 +40,7 @@ func NewTTLMap(maxItems int, name, namespace string) (m *TTLMap) {
 	go func() {
 		for now := range time.Tick(time.Second * 1) {
 			m.l.Lock()
+
 			for k, v := range m.m {
 				if v.invincible {
 					continue
@@ -49,6 +50,7 @@ func NewTTLMap(maxItems int, name, namespace string) (m *TTLMap) {
 					m.delete(k, v.value, v.expiresAt)
 				}
 			}
+
 			m.l.Unlock()
 		}
 	}()

pkg/eth/slot.go

@@ -14,6 +14,7 @@ type SlotTime struct {
 }
 
 func CalculateSlotTime(slot phase0.Slot, genesisTime time.Time, durationPerSlot time.Duration) SlotTime {
+	//nolint:gosec // slot values are within safe range for time.Duration
 	slotStartTime := genesisTime.Add(time.Duration(slot) * durationPerSlot).UTC()
 
 	return SlotTime{

pkg/service/eth/block_id.go

@@ -88,6 +88,10 @@ func NewSlotFromString(id string) (phase0.Slot, error) {
 		return 0, err
 	}
 
+	if slot < 0 {
+		return 0, errors.New("slot cannot be negative")
+	}
+
 	return phase0.Slot(slot), nil
 }
 

pkg/service/eth/eth.go

@@ -572,7 +572,7 @@ func (h *Handler) BlobSidecars(ctx context.Context, blockID BlockIdentifier, ind
 
 		// Find the sidecar with the given index
 		for i, sidecar := range sidecars {
-			if index == int(sidecar.Index) {
+			if deneb.BlobIndex(index) == sidecar.Index {
 				filtered = append(filtered, sidecars[i])
 
 				break

web/src/parts/slot/Slot.tsx

@@ -38,6 +38,8 @@ export default function Slot(props: { slot: number }) {
         return data?.data?.block?.Electra;
       case 'FULU':
         return data?.data?.block?.Fulu;
+      case 'GLOAS':
+        return data?.data?.block?.Gloas;
       case 'PHASE0':
         return data?.data?.block?.Phase0;
     }

web/src/types/index.ts

@@ -76,14 +76,15 @@ export interface APIBeaconBlockMessage {
 }
 
 export interface APIBeaconBlock {
-  Version: 'BELLATRIX' | 'ALTAIR' | 'PHASE0' | 'CAPELLA' | 'DENEB' | 'ELECTRA' | 'FULU';
+  Version: 'BELLATRIX' | 'ALTAIR' | 'PHASE0' | 'CAPELLA' | 'DENEB' | 'ELECTRA' | 'FULU' | 'GLOAS';
   Altair?: APIBeaconBlockMessage;
   Bellatrix?: APIBeaconBlockMessage;
   Capella?: APIBeaconBlockMessage;
   Deneb?: APIBeaconBlockMessage;
   Phase0?: APIBeaconBlockMessage;
   Electra?: APIBeaconBlockMessage;
   Fulu?: APIBeaconBlockMessage;
+  Gloas?: APIBeaconBlockMessage;
 }
 
 export interface APIBeaconSlotBlock {