anti
636c057cc5
Stage 4 of the realism migration. Lifts the driver Protocol into a
proper ABC with default plant_file/read_file methods (raise
NotImplementedError), and adds get_driver_for(action) so the
orchestrator worker can dispatch by action shape without isinstance
chains.
SSHDriver now inherits ActivityDriver and implements:
- plant_file: streams base64 via stdin (ARG_MAX-safe, mirrors
decnet.canary.planter; commit c17b9e0). Honours mtime via touch -d
so realism-planned files don't all stamp at wall-clock-now.
- read_file: docker exec cat with FileNotFoundError on rc=1, used by
the upcoming EditAction (stage 3b).
EmailDriver inherits ActivityDriver. Driver alias kept for back-compat
during the migration; removed once realism stages 5-7 land.
93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
"""Driver ABC for orchestrator actions.
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Each concrete driver (SSH, Email, future HTTP/SMB/MySQL) maps one
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:class:`~decnet.orchestrator.scheduler.Action` shape to a side effect
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on a target decky and returns an :class:`ActivityResult` the
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orchestrator persists.
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The ABC lives here, the dispatch factory in
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:mod:`decnet.orchestrator.drivers` ``__init__``, and the impls in
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sibling modules — same pattern as :mod:`decnet.canary.factory`,
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:mod:`decnet.web.db.factory`, and :mod:`decnet.bus.factory`.
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Why ABC and not :class:`Protocol`: drivers also expose lower-level
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helpers (``plant_file``, ``read_file``) that the planner-driven
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realism path will call directly without going through ``run``.
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Inheritance pins the contract for those helpers; a structural
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protocol would let a typo silently produce a half-implemented driver.
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"""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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from dataclasses import dataclass, field
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from datetime import datetime
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from typing import Any
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from decnet.orchestrator.scheduler import Action
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@dataclass
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class ActivityResult:
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"""Outcome of one driver invocation.
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``payload`` is the per-action JSON envelope the worker writes to
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the ``OrchestratorEvent.payload`` column and to the bus event
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body.
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"""
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success: bool
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payload: dict[str, Any] = field(default_factory=dict)
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class ActivityDriver(ABC):
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"""Base class every concrete orchestrator driver inherits.
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Subclasses MUST implement :meth:`run` — the action-shape dispatch.
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Subclasses that interact with files on the target decky SHOULD
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implement :meth:`plant_file` and :meth:`read_file` so the realism
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edit-in-place path can read existing artifacts before mutating
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them. Drivers that don't touch files (e.g. a future pure-traffic
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driver) raise :class:`NotImplementedError` from those, and the
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planner avoids picking ``EditAction`` for them.
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"""
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@abstractmethod
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async def run(self, action: Action) -> ActivityResult:
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"""Execute the action against its target decky."""
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async def plant_file(
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self,
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decky_name: str,
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path: str,
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content: bytes,
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*,
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mode: int = 0o600,
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mtime: datetime | None = None,
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) -> ActivityResult:
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"""Write *content* to *path* inside *decky_name*.
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Default raises :class:`NotImplementedError`; concrete drivers
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that have a write transport (docker exec, ssh, etc.) override.
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Bytes-typed so binary artifacts (DOCX/PDF) survive the wire.
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"""
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raise NotImplementedError(
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f"{type(self).__name__} does not support plant_file"
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)
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async def read_file(self, decky_name: str, path: str) -> bytes:
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"""Read *path* from inside *decky_name*.
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Required for the realism edit-in-place flow (stage 3b of the
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realism migration): the driver reads the previous body, the
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realism engine produces the next iteration, the driver writes
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it back. Default raises :class:`NotImplementedError`.
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"""
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raise NotImplementedError(
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f"{type(self).__name__} does not support read_file"
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)
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# Back-compat alias so existing imports of ``Driver`` keep working
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# while consumers transition to ``ActivityDriver``. Removed once the
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# realism migration is complete.
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Driver = ActivityDriver
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