SolitaryThinker
a9e5f6ee7a
Directory rename (git mv, history preserved) plus rewrite of all references: absolute imports in tests, the zero-dep runner, docstrings, comments, and the README. No behavior change. Run: python3 -m pytest v2/tests/ -q ; python3 v2/run_tests.py ; python3 -m v2.examples
69 lines
2.5 KiB
Python
69 lines
2.5 KiB
Python
"""LoopRunner — the only place iteration lives (design_v3 §5.1).
|
|
|
|
This is the runtime's driver, factored so the engine can either run it to completion
|
|
(``run``) or advance it one step at a time (``peek`` + ``step``) to **interleave** the steps
|
|
of concurrent requests. Per-request state is entirely in ``LoopState``; the runner holds no
|
|
hidden iteration state beyond a cached pending plan, so interleaving is safe by construction
|
|
(the property the §9.3 interleave gate verifies).
|
|
"""
|
|
from __future__ import annotations
|
|
|
|
from typing import Any
|
|
|
|
from .contracts import Done, LoopContext, LoopResult, LoopState, WorkPlan
|
|
|
|
|
|
class LoopRunner:
|
|
def __init__(self, loop: Any, ctx: LoopContext, request: Any, model: Any):
|
|
self.loop = loop
|
|
self.ctx = ctx
|
|
self.state: LoopState = loop.init(request, model, ctx)
|
|
self._done = False
|
|
self._result: LoopResult | None = None
|
|
self._pending: WorkPlan | None = None
|
|
|
|
@property
|
|
def done(self) -> bool:
|
|
return self._done
|
|
|
|
@property
|
|
def result(self) -> LoopResult | None:
|
|
return self._result
|
|
|
|
def peek(self) -> WorkPlan | None:
|
|
"""Compute (and cache) the next WorkPlan. ``next`` is kernel-free, so this is cheap.
|
|
Returns None when the loop is finished (and runs ``finalize`` exactly once)."""
|
|
if self._done:
|
|
return None
|
|
if self._pending is None:
|
|
self.ctx.check_cancel()
|
|
nxt = self.loop.next(self.state)
|
|
if isinstance(nxt, Done):
|
|
self._result = self.loop.finalize(self.state)
|
|
self._done = True
|
|
return None
|
|
self._pending = nxt
|
|
return self._pending
|
|
|
|
def step(self) -> bool:
|
|
"""Execute the pending plan (the inversion point) and fold the result in.
|
|
Returns True when the loop has just finished."""
|
|
plan = self.peek()
|
|
if self._done or plan is None:
|
|
return True
|
|
# the engine binds the current state onto ctx so interceptors see per-request state
|
|
if hasattr(self.ctx, "bind_state"):
|
|
self.ctx.bind_state(self.state)
|
|
result = self.ctx.execute(plan)
|
|
for chunk in plan.emits:
|
|
self.ctx.emit(chunk)
|
|
self.state = self.loop.advance(self.state, result)
|
|
self._pending = None
|
|
return self._done
|
|
|
|
def run(self) -> LoopResult:
|
|
while not self._done:
|
|
self.step()
|
|
assert self._result is not None
|
|
return self._result
|