feat(zap): ZAP wire v1.0 — handshake/seq/retry/FIN session layer + spec + vectors (#85)#129
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Pattermesh wants to merge 1 commit into
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feat(zap): ZAP wire v1.0 — handshake/seq/retry/FIN session layer + spec + vectors (#85)#129Pattermesh wants to merge 1 commit into
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Add the connection-level ZAP wire v1.0 session semantics that sit under the existing PaymentOffer/PaymentProof codecs. Pure-Python, no zap_py dependency. Spec (docs/zap-wire-spec-v1.0.md): 26-byte frame header (magic 0x5A50, wire version, frame type, flags, per-direction u32 seq, cumulative u32 ack, u64 request_id, length-prefixed payload); HELLO/WELCOME handshake; capability bitmask = 8 bits version + 24 bits feature flags (baseline 0x0100001F); cumulative ACK; configurable-RTT retry with exponential backoff; request_id idempotency/dedup; graceful FIN with orphaned-sequence handling; RST error codes; full state machine. Code (switchboard/zap_transport.py): SessionFrame encode/decode, capability make/negotiate helpers, and the ZapSession state machine (handshake, in-order + reorder-buffered delivery, cumulative ack, retransmit queue with injectable clock, idempotent dedup, FIN/close + incomplete-gap detection). Tests: 25 new pure-Python tests in tests/test_zap_transport.py plus static byte-for-byte conformance vectors in tests/protocol_vectors/zap_session.v1.json. `python3 -m pytest tests/test_zap_transport.py -q` -> 28 passed, 36 skipped. Does not touch x402_middleware.py, gas_*.py, or lucidly. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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| FRAME_RST, | ||
| } | ||
| # Frame types that consume sequence space (spec §5). | ||
| _SEQ_CONSUMING = {FRAME_HELLO, FRAME_WELCOME, FRAME_DATA, FRAME_FIN} |
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Implements ZAP wire v1.0 for #85: spec doc, pure-Python session state machine, conformance vectors, 25 TDD tests.
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