61 lines
2.3 KiB
Markdown
61 lines
2.3 KiB
Markdown
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---
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model: claude-fable-5[1m]
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service: claude
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timestamp: 2026-06-10T17:11:42Z
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git_ref: datad_service
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diff_cmd: git log -1 -p --follow -- ai/prompt-io/claude/20260610T171142Z_119d2c04_prompt_io.md
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---
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NOTE: diff-ref mode entry (code committed in the same
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commit as this log); backfilled from the live dev
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session transcript per the `/prompt-io` skill rules.
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> `git log -1 -p --follow -- piker/data/_daemon.py`
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Generated symbols + key design decisions:
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- `_datad_service_mods: list[str]` — datad-always
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enabled mods, the data-side successor to the old
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`piker.brokers._daemon._data_mods` set; kept minimal
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per the caps-sec model.
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- `_setup_persistent_datad()` — `@tractor.context`
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lifetime fixture: console-log setup then allocates
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the actor-global feed bus via
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`feed.get_feed_bus(brokername, service_nursery)`
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exactly as the old brokerd fixture did, pinned open
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with `ctx.started()` + `sleep_forever()`.
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- `datad_init()` — actor name `f'datad.{brokername}'`;
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copies backend `_spawn_kwargs` (CRITICAL for `ib`'s
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`infect_asyncio=True`); builds `enable_modules` from
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`getattr(brokermod, '_datad_mods',
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getattr(brokermod, '__enable_modules__', []))` as
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the flat-backend fallback.
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- `spawn_datad()` — `Services.actor_n.start_actor()` +
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`Services.start_service_task()` exactly mirroring
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`spawn_brokerd()`; dedup-composes enable mods via
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`list(dict.fromkeys(...))`.
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- `maybe_spawn_datad()` — wraps `maybe_spawn_daemon(
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service_name=f'datad.{brokername}', ...)`.
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> `git log -1 -p --follow -- piker/service/_actor_runtime.py`
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> `git log -1 -p --follow -- piker/service/__init__.py`
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> `git log -1 -p --follow -- tests/test_services.py`
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Design rationale (verbatim from session):
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- `_root_modules` must gain `piker.data._daemon` so
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`pikerd_portal.run(spawn_datad, ...)` resolves in
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the root.
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- the `Services`-based impl style deliberately mirrors
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`spawn_brokerd()` so the eventual `tractor.hilevel`
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`ServiceMngr` port (see the `service_mng_to_tractor`
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branch's d8c21d44 prep, surfaced by the
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user-requested branch-overlap survey) lands
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symmetrically on both spawn fns.
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- mod placement (`piker/data/_daemon.py` vs.
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generalizing `piker.brokers._daemon`) follows the
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per-subsystem daemon-mod convention
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(`.clearing._ems`, `.data._sampling`) and resolves
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the existing TODO at `brokers/_daemon.py:49` ("move
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this def to the `.data` subpkg").
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