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hilevel.ServiceMngr from piker #12

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goodboy wants to merge 4 commits from hilevel_serman into ext_type_plds
pull from: hilevel_serman
merge into: goodboy:ext_type_plds
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4 Commits (main)

Author SHA1 Message Date
Tyler Goodlet d1f1cd3474 Use shorthand nursery var-names per convention in codebase 2025-03-27 15:52:27 -04:00
Tyler Goodlet 908214ce5c Better separate service tasks vs. ctxs via methods 
Namely splitting the handles for each in 2 separate tables and adding
a `.cancel_service_task()`.

Also,
- move `_open_and_supervise_service_ctx()` to mod level.
- rename `target` -> `ctx_fn` params througout.
- fill out method doc strings.
 2025-03-27 15:52:27 -04:00
Tyler Goodlet 8cc9025db9 Mv over `ServiceMngr` from `piker` with mods 
Namely distinguishing service "IPC contexts" (opened in a
subactor via a `Portal`) from just local `trio.Task`s started
and managed under the `.service_n` (more or less wrapping in the
interface of a "task-manager" style nursery - aka a one-cancels-one
supervision start).

API changes from original (`piker`) impl,
- mk `.start_service_task()` do ONLY that, start a task with a wrapping
  cancel-scope and completion event.
  |_ ideally this gets factored-out/re-implemented using the
    task-manager/OCO-style-nursery from GH #363.
- change what was the impl of `.start_service_task()` to `.start_service_ctx()`
  since it more explicitly defines the functionality of entering
  `Portal.open_context()` with a wrapping cs and completion event inside
  a bg task (which syncs the ctx's lifetime with termination of the
  remote actor runtime).
- factor out what was a `.start_service_ctx()` closure to a new
  `_open_and_supervise_service_ctx()` mod-func holding the meat of
  the supervision logic.

`ServiceMngr` API brief,
- use `open_service_mngr()` and `get_service_mngr()` to acquire the
  actor-global singleton.
- `ServiceMngr.start_service()` and `.cancel_service()` which allow for
  straight forward mgmt of "service subactor daemons".
 2025-03-27 15:52:27 -04:00
Tyler Goodlet 1128181c64 Initial idea-notes dump and @singleton factory idea from `trio`-gitter 2025-03-27 15:52:27 -04:00