Rongsong Shen 06135954ff chore: baseline snapshot — prior-session work + ha-consistency-invariants spec family

Pre-existing uncommitted work: ha-repl-hardening payload data plane (7.x),
heartbeat liveness fix (Req 1.3), connection-reuse ASAN fixes, doc cleanup.
New: ha-consistency-invariants umbrella (requirements/design/research) and
its four implementation sub-specs (specs generated via batch, cross-spec
review applied), steering roadmap + product.md Raft+CP decision.

2026-06-11 13:21:50 +00:00

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P1-2: Host Resource Requirement Select — Investigation

Status

C layer (P1-2a): COMPLETE — eval_select_simple wired in xce_select.c (PEG grammar → AST → CSE, memoized eval). Scheduler integration (Phase 6) done. See src/docs/resreq-ast-cse-design.md for architecture reference.
Go bridge (P1-2b): PENDING — EvalSelectForHost remains a stub returning errNoCGO. CGO boundary, resource value lookup from in-memory store, and FilterHostByResReqSelect are still to implement.

Background

The select field in an LSF-style resource requirement string (e.g. select[mem>4096 && type==X86_64]) filters candidate hosts before slot allocation. Currently EvalSelectForHost is a no-CGO stub that always returns errNoCGO.

The full feature requires two layers:

C parser + evaluator — parse the boolean select expression into an AST and evaluate it against a host's resource values.
Go bridge — call the C evaluator via CGO and wire it into FilterHostByResReqSelect in the controllers layer.

Sub-tasks

#11 P1-2a: C select expression parser (PEG + eval) ✓ COMPLETE

Files implemented:

include/resreq.h — expression-tree types, enums, extern declarations.
lib/xce_select.peg — PEG grammar for select boolean expressions.
lib/xce_select.c — parse_select(), eval_select_simple(), CSE tree.
lib/meson.build — xce_select.peg in build.

#12 P1-2b: Go EvalSelectForHost + FilterHostByResReqSelect (remaining)

Files to touch:

backend/clib.go — Implement EvalSelectForHost(hostname, selectExpr string) error using cgo.Handle for callback context; add #include "resreq.h", extern C declarations, xce_select_destroy helper.
controllers/hosts.go — Implement FilterHostByResReqSelect(hosts []models.HostInfo, expr string), update preCheckHostRequest() limit from 4094 → 1024 bytes.

Open questions:

Does EvalSelectForHost look up live resource values from the in-memory store, or are values passed directly from C?
cgo.Handle usage pattern — per-call or session-level?
Input validation: max expression length (1024 bytes), allowed characters.

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