feat: parse the head_v2 SSE event (gloas) - #41
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Adds HeadEventV2 and dispatch for the head_v2 beacon-API topic: the
gloas-aware head event that drops previous_duty_dependent_root, renames
current_duty_dependent_root to current_epoch_dependent_root, and adds
next_epoch_dependent_root, payload_status and execution_optimistic. The
payload arrives in the {"version","data"} envelope, so the handler uses
unmarshalVersionedEventData (bare objects accepted as fallback, matching
the other gloas topics).
Claude-Session: https://claude.ai/code/session_019cbhUv62kwFTKQD5aM8FGC
The head_v2 event type made every decodeFixedBytes call site pass a 32-byte length, tripping unparam on the untouched helper. The parameter stays — it exists for future non-root fields. Claude-Session: https://claude.ai/code/session_019cbhUv62kwFTKQD5aM8FGC
samcm
marked this pull request as ready for review
July 12, 2026 08:34
Beacon API JSON encodes integers as strings; lighthouse returns "version": "1" and unmarshaling into a bare uint8 fails, breaking every gloas BeaconState fetch (xatu-cannon's beaconValidators deriver errors with 'cannot unmarshal string into Go struct field builderJSON.version'). MarshalYAML also dropped the field entirely.
…y and ptc_window (#43) execution_payload_availability is a bitvector, hex-encoded on the wire like justification_bits; it was marshalled as a per-byte decimal array and unmarshalled through encoding/json's base64 path for byte slices, so every gloas BeaconState fetch failed. ptc_window is served by lighthouse as bare JSON numbers rather than the quoted-integer convention; accept both forms.
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Adds
HeadEventV2plus topic registration and dispatch for the beacon-APIhead_v2eventstream topic (gloas). The event uses the versioned{"version","data"}envelope, handled viaunmarshalVersionedEventDatalike the other gloas topics, with the bare shape accepted as a fallback. Consumers subscribe withHeadV2Handleror receive*apiv1.HeadEventV2through the generic handler.https://claude.ai/code/session_019cbhUv62kwFTKQD5aM8FGC