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zeekay
baa275e80f
Adds the missing SERVER side of the FIX trading path and a unified e2e proving REAL fills over all four DEX access paths against ONE book. The decomplection: the D-Chain CLOB (pkg/dchain) is the single matcher, reached over the single frozen clob_* ZAP surface (pkg/zapwire). Every access path is a thin wire dialect onto that surface — none owns a matcher. This commit adds the two missing dialects (FIX, a focused WS venue handler) and the shared seam they translate through. New: - pkg/venue: ONE Venue interface (ensure/place/cancel/submit = the clob_* ops) + ONE production ZAP-backed impl. The seam FIX, WS, and the 0x9010 precompile all route through. Dials the SAME rpc.Listen socket dvenue serves. - pkg/fix: dependency-free FIX 4.4 codec (BodyLength tag 9 + CheckSum tag 10 computed AND validated; spec-correct emit/parse) + a TCP acceptor (Logon/Heartbeat/TestRequest/Logout, monotonic seq, NewOrderSingle->clob_submit->ExecutionReport, OrderCancelRequest-> clob_cancel). Pure protocol front-end onto Venue; no matcher. - pkg/api/venue_ws.go: minimal gorilla/websocket /ws handler that translates a JSON order to Venue.Submit and streams fills back — the WS dialect onto the SAME venue (kept orthogonal to the existing TradingEngine product WS server). - cmd/fix-gateway: runs the acceptor in front of a live venue (-venue clob_* endpoint), the production form of the FIX path. - pkg/dchain/fourpath_e2e_test.go: stands up ONE venue + ONE LUX/LUSD book and drives a real limit-order -> match -> FILL over EACH path (V4 precompile engine_zap frame | ZAP native | FIX | WS) against the SAME resting asks, asserting real consensus fills, per-path custody changes, and GLOBAL conservation (available+locked invariant). V4 leg: exercised at the engine_zap WIRE boundary — the exact 66-byte clob_submit frame engine_zap.Swap emits (asserted byte-identical to zapwire.EncodeSubmit) + the V4 BalanceDelta sign convention derived from the consensus fills. A live luxd EVM (StateDB replay-idempotency, gas, PoolManager) is what the full on-chain precompile call additionally needs; the matcher boundary is proven in-process here. No deps added; no existing files modified (go.mod/go.sum untouched). Builds CGO_ENABLED=0; race-clean.