Rewrite submit_block relay communication to support SSZ and JSON#468
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JasonVranek wants to merge 3 commits into
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Rewrite submit_block relay communication to support SSZ and JSON#468JasonVranek wants to merge 3 commits into
JasonVranek wants to merge 3 commits into
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Introduce EncodingType, AcceptedEncodings, and content negotiation primitives for SSZ support in the PBS pipeline. Includes: - EncodingType enum with FromStr/Display and MIME param tolerance - AcceptedEncodings with q-value aware Accept header parsing - SSZ bid value extraction from SignedBuilderBid by fork - deserialize_body and parse_response_encoding_and_fork helpers - Per-fork type aliases for BuilderBid and ExecutionPayloadHeader - SszValueError, PbsError::GeneralRequest, PbsClientError variants - Comprehensive unit tests for all new types and helpers - New deps: headers-accept, mediatype
content negotiation. Includes: - SSZ and JSON encoding/decoding for relay get_header responses - Content-Type and Eth-Consensus-Version header parsing - Accept header forwarding to relays with q-value ordering - MIME parameter tolerance on relay response Content-Type - Fork-aware SSZ bid value extraction for all supported forks - Mock relay and validator SSZ support in test infrastructure - get_header integration tests for both encodings - Dynamic port allocation in tests via get_free_listener
content negotiation. Includes: - SSZ-first request encoding with JSON fallback on 406/415 - Content-Type and Eth-Consensus-Version header handling - Fork-aware SSZ decoding for relay responses - MIME parameter tolerance on relay response Content-Type - v2 to v1 fallback forwards payload to BN (prevents silent block loss) - V2 fallback metric counter - Comprehensive submit_block integration tests for both encodings
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Summary
Rewrites submit_block relay communication to support SSZ and JSON content negotiation.
What's in this PR
V2_FALLBACK_TO_V1metric counter for observabilityReview notes
The v2→v1 fallback behavior is an intentional change from the previous code which silently discarded the v1 payload. The beacon node needs the unblinded execution payload to broadcast the block (returning an empty 202 on fallback would cause silent block loss).
Part 3 of 4: SSZ types → get_header → submit_block → validation bypassing
Attribution
This work builds on the SSZ builder flow originally implemented by @eserilev
in #252 and ported to the current codebase by @jclapis in #403.
Co-authored-by: Eitan Seri-Levi eserilev@ucsc.edu
Co-authored-by: Joe Clapis jclapis@outlook.com