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Rene Cannao aef01ef0be feat(mysqlx): compress outbound server frames (Phase 3) ... Phase 3 of three-phase X Protocol compression support: server→client compression on outbound frames. Wraps up the MVP — CapabilitiesSet negotiation (Phase 1), inbound decompression (Phase 2), and now outbound compression all roundtrip. What this commit does ===================== forward_frame_to_client() — the chokepoint for backend→client frame forwarding — now routes through send_to_client_compressed(), which: 1. Returns early to plain client_ds_.enqueue_frame() when compression is not negotiated OR the body is below COMPRESSION_MIN_OUTPUT_BYTES (50 bytes — same threshold the upstream MySQL X plugin uses; per- message envelope + framing overhead would otherwise dwarf savings). 2. With combine_mixed_messages = false: emits one Compression frame per body. The protobuf has server_messages set to the original frame's msg_type and uncompressed_size set to the original body length, so a spec-compliant client can decompress in place. 3. With combine_mixed_messages = true: appends a fully-framed copy of the body to compress_batch_framed_ and bumps compress_batch_count_. Once the count reaches max_combine_messages (defaulting to 64 if the client didn't supply one), or flush_compression_batch() is invoked at a natural boundary, all buffered frames are emitted as one Compression message with NEITHER server_messages nor client_messages set — payload is the concatenated stream of framed X messages, matching the spec's third payload shape. The flush points are: - handler_waiting_server_msg() when it sees a terminal frame (end of a result set / final OK / etc.) — the response is "done" so anything still buffered must reach the wire before we go back to WAITING_CLIENT_XMSG. - handler_session_reset_waiting() on the ERROR path before write_to_net(), same reasoning. Mid-response we deliberately do NOT flush — that would defeat the combine_mixed_messages benefit by emitting a Compression message per batch hit, which is exactly what we're trying to avoid for streaming result sets. The count cap bounds how long a single batch can grow. Compressor selection mirrors Phase 2: - zstd_stream uses ZSTD_compressCCtx() with a per-session ZSTD_CCtx that's lazily allocated and freed in reset_compression_state(). - lz4_message uses LZ4_compress_default() one-shot. On compressor failure (ZSTD_isError or lz4 returning <= 0) the helper falls back to enqueueing the body uncompressed — losing compression benefit beats dropping the message. The session itself stays healthy. Tests ===== mysqlx_compression_unit-t now plans 64 sub-tests, all passing: - Phase 1: 22 sub-tests for capability negotiation - Phase 2: 17 sub-tests for inbound decompression - Phase 3 (new, 25 sub-tests): - zstd round-trip: frame on the wire is COMPRESSION with server_messages = NOTICE; payload decompresses back to the exact original 200-byte body - lz4 round-trip, same shape - below-threshold passthrough: 20-byte body emitted as plain NOTICE, not COMPRESSION (verifies the fast path) - combine_mixed_messages with max_combine_messages=3: three successive sends produce ONE Compression frame whose decompressed payload contains all three NOTICE bodies in order, with neither server_messages nor client_messages set - compression-disabled passthrough: when no negotiation, the helper acts as a plain enqueue_frame() (proves a client that never opts in is unaffected) A few new test-only accessors expose the batch state and send_to_client_compressed() entry point so tests can exercise the output path without wiring a fake backend (which would block on connect() in the dispatcher anyway). Verification ============ Top-level `PROXYSQLGENAI=1 make` builds cleanly. mysqlx_compression_unit-t passes 64/64. plugin_lifecycle_unit-t (26/26) passes unchanged. mysqlx_session_unit-t still has its two pre-existing failures at sub-tests 33-34 (auth flow), unrelated to compression and present on this branch before the Phase 1 commit.		1 month ago
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mysqlx_admin_schema.h	fix: align mysqlx plugin schema and smoke test	2 months ago
mysqlx_config_store.h	feat(mysqlx): add route_exists() predicate to MysqlxConfigStore	1 month ago
mysqlx_connection.h	fix(mysqlx): use resolved backend_username when setting up the backend connection	1 month ago
mysqlx_data_stream.h	fix(mysqlx): protocol, data-stream and stats robustness fixes	1 month ago
mysqlx_plugin.h	Merge remote-tracking branch 'origin/plugin-chassis' into ProtocolX-rebased	1 month ago
mysqlx_protocol.h	fix(mysqlx): apply 12 critical/high fixes from four-way review + robustness test suite	2 months ago
mysqlx_session.h	feat(mysqlx): compress outbound server frames (Phase 3)	1 month ago
mysqlx_stats.h	feat(mysqlx): add resolve_backend_target() method on session	1 month ago
mysqlx_thread.h	Merge remote-tracking branch 'origin/feature/mysqlx-route-identity' into HEAD	1 month ago