feat: ConnState proofs, Huffman O(1) trie, xDS JSON parser, streaming StreamCallContext (v1.5.0) - #14
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…ext (v1.5.0)
Tranche 1 — H2.ConnState proof foundations (Proofs/ConnState.lean):
- CONTINUATION sequencing: handleFrame rejects non-CONTINUATION frames when
expectContinuation is set; wrong-stream CONTINUATION is a connection error.
- Non-negative recv windows: windows ≥ 0 after DATA within budget; overflow → GOAWAY.
- ENHANCE_YOUR_CALM: server rejects oversized header blocks with error code 0xb.
- GOAWAY gate: new streams rejected once wentAway = true; GOAWAY frame sets flag.
Tranche 2 — Security hardening (LGSEC-2026-23 + LGSEC-2026-32):
- Huffman/Huffman.lean: O(1) TrieRow decoder sorted by code-length; fixes stale
high-bit accumulator bug (mask with 0x3fffffff after each symbol consume);
adds BEq/DecidableEq for Error; EOS/padding lemmas in Proofs/Hpack.lean.
- Grpc/Xds.lean: replaces ad-hoc string scraper with recursive-descent JSON parser
(parseVal with structural recursion on fuel); handles field ordering, escapes,
unterminated values safely; parseEndpointsJson also updated.
Tranche 3 — Streaming ServerCallContext (mTLS IAM parity, v1.5.0):
- StreamCallContext alias (= ServerCallContext) in Grpc/PeerIdentity.lean.
- Stream.{Server,Client,Bidi}StreamHandlerWithContext types in Grpc/Stream.lean.
- MethodHandler.{serverStreamCtx,clientStreamCtx,bidiCtx} dispatch variants.
- Server.register{ServerStream,ClientStream,Bidi}WithContext + typed variants.
- handlerFor dispatch extended to pass ctx to all new handler variants.
- Codegen: emits register{Svc}{Method}{ServerStream,ClientStream,Bidi}WithContext.
- Version bumped to 1.5.0 in lakefile, Grpc.lean, Grpc/Metadata.lean.
- CHANGELOG and ROADMAP updated.
Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
H2.ConnStateproof foundations (Proofs/ConnState.lean, zerosorry): CONTINUATION sequencing, non-negative recv-window,ENHANCE_YOUR_CALMon oversized header list, GOAWAY gate on new streams.StreamCallContext(v1.5.0):Server/Stream/Bidi*WithContexthandler types + register helpers + codegen emits context-aware streaming registrars; mTLSpeerIdentity+ metadata now available in all streaming handler types.Test plan
lake build Proofs— all ConnState + Huffman theorems passnative_decidewith nosorrylake build— full clean build (all 59 targets)parseBootstraphandles out-of-order fields, escaped strings, unterminated valuesregisterServerStreamWithContext/registerBidiWithContextin helloworld exampleMade with Cursor