writeonce/docs/stories/language-runtime-database/done/07-logwatcher-proof.md
shoney.arickathil 2a4c304378 docs: stories foldered by state — done/ and refine/
- done/ (11): 1, 2, 3, 4, 6, 7, 7b, 9, 9b, 15, 16 — landed iterations
  (9/9b remainders live in the post-12 drain list, not in the files)
- refine/ (8): 9c, 9d, 9e, 9f, 9g, 11, 13, 14 — everything marked
  "no spec yet / brainstorm before planning"
- root keeps: 00-story (index), 05 (partial, plan 8 open), 8/10/12
  (specs or plans exist), 17 (parked, spec+plan approved), 18 (next)
- every cross-reference re-pathed and VERIFIED resolving: board, specs,
  plans, employee-list README, story table, intra-story links (moved
  files' relative links deepened one level; done/7b's 9e pointer now
  crosses to refine/)
- pre-existing dead link noted, not touched: refine/11-fibers.md points
  at docs/plan/exploration/fibers/00-fibers.md which does not exist
  (predates the move)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-20 04:33:24 +02:00

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# Iteration 7 — log-watcher proof workload
> Format: `product/story-iteration-template`. Part of
> [Story — one language, one runtime, one database, one binary](../00-story.md).
## Goals
- The language's driving workload runs for real: the Haxe log-watcher
daemon (~1,200 lines) re-expressed file-for-file in `.wo` at
`docs/examples/log-watcher/`, compiled by `woc`, detecting a silent
death on a live file.
- The README mapping table's "could not express" column is empty — the
systems track's acceptance bar: nothing in a real daemon exceeded the
language.
> **Status: ✅ landed 2026-08-15.** Compile-and-run met 2026-08-14 (zero
> diagnostics, 106 KB standalone binary, all three modes work); the
> executable half landed 2026-08-15 — zero ASan leaks in all three modes,
> SIGTERM ends parked syscalls, fds flat across 200 requests, and the
> `LW_SOAK` gate holds RSS/descriptors flat under sustained load.
> `just log-watcher`: 7 checks, 0 failures. The work is recorded in
> [`plan/compiler/2026-08-14-logwatcher-executable.md`](../../../plan/compiler/2026-08-14-logwatcher-executable.md)
> and nothing else blocks this iteration.
## Acceptance Criteria
- What to achieve?
- **Given** the eight-file `.wo` port (logtail, watcher, cron, probes,
supervisor, mcp, tools, main),
- **when** `woc` compiles the sample and the ported fixture groups run,
- **then** compilation is clean and every fixture mirrors its named
Haxe test case with matching behavior.
- What to achieve?
- **Given** the built sample running `watch` against a growing
tempfile,
- **when** the feed ends with an error line and the quiet period
elapses,
- **then** exactly one detection line appends to the JSONL sink —
the original's measured behavior, reproduced.
- What to achieve?
- **Given** the README mapping table,
- **when** the iteration closes,
- **then** every row names its `.hx` sibling and deliberate
divergences, and the could-not-express column is empty.
- What to achieve? *(added 2026-08-14 — compiling is not running)*
- **Given** any of the three modes started under a sanitizer build,
- **when** it is signalled to stop after a soak,
- **then** it exits cleanly on SIGTERM alone, reports zero leaks, and
its resident size and descriptor count are flat across the soak.
## Out Of Scope
- The sqlite-backed minilog tools — expressible when iteration 9's SQL
lands; recorded as scoped-out, not inexpressible.
- New language or stdlib features: a gap found here is a defect report
against iterations 5/6, and this iteration stops until it's resolved.
## Info
- The `.wo` files may be authored docs-first ahead of this iteration
(spec `2026-08-07-logwatcher-sample-and-principles-design.md`); this
iteration is where they must actually compile and run.
- The pure-core discipline (tail state machine, cron math, MCP `handle`
socket-free and clock-injected) is preserved — the original's best
design decision.
## Proposed Solution
- The authoring plan (`docs/superpowers/plans/2026-08-01-log-watcher-sample.md`)
is spent: the `.wo` files exist and compile.
- What remains is
[`plan/compiler/2026-08-14-logwatcher-executable.md`](../../../plan/compiler/2026-08-14-logwatcher-executable.md)
— six tasks, every one traced to a measurement on this sample: the ownership
pass learning stdlib return types, dropping a projected temporary, the
runtime's own argv container, honouring the stop signal in blocking calls,
closing accepted connections, and a soak that would have caught all of it.
- `just log-watcher` (`scripts/log-watcher-accept.sh`) is this iteration's gate:
compile, watch alert, cron schedule, and three MCP checks today; the soak
joins it in the last task.