757 lines
21 KiB
Markdown
757 lines
21 KiB
Markdown
# Scheduler Foundation Implementation Plan
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> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
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**Goal:** Add the internal scheduler foundation needed for future concurrent foreach and native subgraphs while preserving current serial workflow behavior.
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**Architecture:** `RunState.frames` remains the source of frame lifecycle state, and a new serialized `ready_frame_ids` queue defines deterministic scheduling order. A new internal `wf_core.runtime.scheduler` module owns frame creation, enqueue/select, block/wake, and no-ready-frame resolution. Existing sync and async engines both use scheduler selection before `prepare_step`; node execution stays split between sync and async paths.
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**Tech Stack:** Python 3.14, dataclasses, pytest, Pydantic workflow models, existing `wf_core` runtime modules.
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---
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## Files
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- Modify: `src/wf_core/run_state.py`
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- Add `FrameStatus.BLOCKED`.
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- Add `RunState.ready_frame_ids: list[str]`.
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- Create: `src/wf_core/runtime/scheduler.py`
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- Internal scheduler helpers and typed block/foreach metadata helpers.
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- Modify: `src/wf_core/runtime/ops/runs.py`
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- Initialize root frame and ready queue.
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- Modify: `src/wf_core/runtime/ops/flow.py`
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- Re-enqueue normal frame advances and complete terminal frames through scheduler helpers.
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- Modify: `src/wf_core/runtime/ops/foreach.py`
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- Use typed foreach metadata, explicit child frame creation, block parent, enqueue child.
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- Modify: `src/wf_core/runtime/ops/frames.py`
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- Keep context helpers; demote stack-collapse usage or leave compatibility wrappers that call scheduler helpers.
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- Modify: `src/wf_core/runtime/preparation.py`
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- Stop relying on stack-style frame collapse for selection.
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- Resume interrupt by waking/enqueueing the resumed frame.
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- Modify: `src/wf_core/runtime/engine.py`
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- Use scheduler loop for sync and async resume.
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- Modify: `src/wf_core/runtime/step.py`
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- Keep `prepare_step()` boundary; ensure selected frame is already chosen by scheduler.
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- Test: `tests/core/test_scheduler.py`
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- Unit tests for scheduler helpers.
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- Test: `tests/core/test_run_state.py`
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- Add serialization/additive field checks if needed.
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- Test: existing foreach/interrupt tests under `tests/authoring/` and `tests/core/`
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- Add focused regressions where the behavior is not already covered.
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---
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### Task 1: Add RunState Scheduler Fields
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**Files:**
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- Modify: `src/wf_core/run_state.py`
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- Test: `tests/core/test_scheduler.py`
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- [ ] **Step 1: Write failing tests for ready queue serialization and frame status**
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Create `tests/core/test_scheduler.py` with:
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```python
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from __future__ import annotations
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from wf_core.run_state import FrameStatus, RunState, RunStatus
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def test_run_state_serializes_ready_frame_ids() -> None:
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run = RunState(
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workflow_name="demo",
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status=RunStatus.PENDING,
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workflow_input={},
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state={},
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ready_frame_ids=["root"],
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)
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dumped = run.to_dict()
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assert dumped["ready_frame_ids"] == ["root"]
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def test_frame_status_has_blocked() -> None:
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assert FrameStatus.BLOCKED == "blocked"
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```
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- [ ] **Step 2: Run failing tests**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py -q
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```
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Expected: fails because `ready_frame_ids` and `FrameStatus.BLOCKED` do not exist.
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- [ ] **Step 3: Implement minimal state fields**
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In `src/wf_core/run_state.py`:
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```python
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class FrameStatus(StrEnum):
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PENDING = "pending"
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RUNNING = "running"
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BLOCKED = "blocked"
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COMPLETED = "completed"
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FAILED = "failed"
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INTERRUPTED = "interrupted"
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```
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Add to `RunState`:
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```python
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ready_frame_ids: list[str] = field(default_factory=list)
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```
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- [ ] **Step 4: Verify**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py -q
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```
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Expected: pass.
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---
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### Task 2: Create Internal Scheduler Helpers
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**Files:**
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- Create: `src/wf_core/runtime/scheduler.py`
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- Test: `tests/core/test_scheduler.py`
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- [ ] **Step 1: Add failing scheduler helper tests**
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Append tests:
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```python
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import pytest
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from wf_core.errors import WorkflowExecutionError
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from wf_core.run_state import ExecutionFrame
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from wf_core.runtime.scheduler import (
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add_frame,
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block_frame_on_children,
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enqueue_frame,
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select_next_frame,
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wake_frame,
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)
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def _run() -> RunState:
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return RunState(
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workflow_name="demo",
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status=RunStatus.RUNNING,
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workflow_input={},
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state={},
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)
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def test_add_frame_rejects_duplicate_frame_ids() -> None:
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run = _run()
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add_frame(run, ExecutionFrame(id="root", kind="root", node_id="a"))
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with pytest.raises(WorkflowExecutionError, match="duplicate frame id"):
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add_frame(run, ExecutionFrame(id="root", kind="root", node_id="a"))
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def test_enqueue_is_unique_and_priority_moves_to_front() -> None:
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run = _run()
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add_frame(run, ExecutionFrame(id="a", kind="root", node_id="a"))
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add_frame(run, ExecutionFrame(id="b", kind="root", node_id="b"))
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enqueue_frame(run, "a")
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enqueue_frame(run, "b")
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enqueue_frame(run, "a")
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enqueue_frame(run, "a", front=True)
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assert run.ready_frame_ids == ["a", "b"]
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def test_select_next_frame_pops_and_marks_running() -> None:
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run = _run()
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add_frame(run, ExecutionFrame(id="root", kind="root", node_id="a"))
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enqueue_frame(run, "root")
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frame = select_next_frame(run)
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assert frame is not None
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assert frame.id == "root"
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assert frame.status == FrameStatus.RUNNING
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assert run.ready_frame_ids == []
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assert run.current_frame_id == "root"
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assert run.current_node_id == "a"
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def test_blocked_frame_is_not_selectable_until_woken() -> None:
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run = _run()
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add_frame(run, ExecutionFrame(id="parent", kind="root", node_id="foreach"))
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block_frame_on_children(run, "parent", ("child",))
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assert select_next_frame(run) is None
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wake_frame(run, "parent")
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selected = select_next_frame(run)
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assert selected is not None
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assert selected.id == "parent"
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```
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- [ ] **Step 2: Run failing tests**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py -q
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```
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Expected: fails because `wf_core.runtime.scheduler` does not exist.
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- [ ] **Step 3: Implement scheduler helpers**
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Create `src/wf_core/runtime/scheduler.py`:
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```python
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from __future__ import annotations
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from collections.abc import Sequence
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from dataclasses import dataclass
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from wf_core.errors import WorkflowExecutionError
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from wf_core.run_state import ExecutionFrame, FrameStatus, RunState, RunStatus
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@dataclass(slots=True, frozen=True)
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class BlockedOnChildren:
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"""Typed block reason for frames waiting on child frame completion."""
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child_frame_ids: tuple[str, ...]
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@classmethod
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def from_frame(cls, frame: ExecutionFrame) -> "BlockedOnChildren | None":
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raw = frame.metadata.get("blocked_on")
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if raw is None:
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return None
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if not isinstance(raw, dict) or raw.get("type") != "child_frames":
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raise WorkflowExecutionError(
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f"malformed block reason for frame {frame.id!r}"
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)
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raw_ids = raw.get("frame_ids")
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if not isinstance(raw_ids, list) or not all(
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isinstance(item, str) for item in raw_ids
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):
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raise WorkflowExecutionError(
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f"malformed child frame ids for frame {frame.id!r}"
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)
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return cls(tuple(raw_ids))
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def to_metadata(self) -> dict[str, object]:
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return {"type": "child_frames", "frame_ids": list(self.child_frame_ids)}
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def add_frame(run: RunState, frame: ExecutionFrame, *, ready: bool = False) -> None:
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"""Add a frame once; frame id reuse is always a runtime invariant error."""
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if frame.id in run.frames:
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raise WorkflowExecutionError(f"duplicate frame id {frame.id!r}")
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run.frames[frame.id] = frame
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if ready:
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enqueue_frame(run, frame.id)
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def enqueue_frame(run: RunState, frame_id: str, *, front: bool = False) -> None:
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"""Put a pending frame in the ready queue without creating duplicates."""
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frame = _frame(run, frame_id)
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if frame.status != FrameStatus.PENDING:
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raise WorkflowExecutionError(
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f"cannot enqueue frame {frame_id!r} with status {frame.status!s}"
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)
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if frame_id in run.ready_frame_ids:
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run.ready_frame_ids.remove(frame_id)
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if front:
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run.ready_frame_ids.insert(0, frame_id)
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else:
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run.ready_frame_ids.append(frame_id)
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def select_next_frame(run: RunState) -> ExecutionFrame | None:
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"""Select the next ready frame and expose it through compatibility cursor fields."""
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while run.ready_frame_ids:
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frame_id = run.ready_frame_ids.pop(0)
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frame = _frame(run, frame_id)
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if frame.status != FrameStatus.PENDING:
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raise WorkflowExecutionError(
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f"ready frame {frame_id!r} has status {frame.status!s}"
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)
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frame.status = FrameStatus.RUNNING
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run.current_frame_id = frame.id
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run.sync_from_current_frame()
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return frame
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return None
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def mark_frame_pending(run: RunState, frame_id: str, *, front: bool = False) -> None:
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"""Mark a live frame pending and enqueue it for future execution."""
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frame = _frame(run, frame_id)
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frame.status = FrameStatus.PENDING
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enqueue_frame(run, frame_id, front=front)
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def block_frame_on_children(
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run: RunState, frame_id: str, child_frame_ids: Sequence[str]
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) -> None:
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"""Mark a frame blocked on child completion and remove it from the ready queue."""
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frame = _frame(run, frame_id)
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run.ready_frame_ids = [item for item in run.ready_frame_ids if item != frame_id]
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frame.status = FrameStatus.BLOCKED
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frame.metadata["blocked_on"] = BlockedOnChildren(
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tuple(child_frame_ids)
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).to_metadata()
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def wake_frame(run: RunState, frame_id: str, *, front: bool = False) -> None:
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"""Wake a blocked or interrupted frame and enqueue it as pending."""
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frame = _frame(run, frame_id)
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if frame.status not in {FrameStatus.BLOCKED, FrameStatus.INTERRUPTED}:
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raise WorkflowExecutionError(
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f"cannot wake frame {frame_id!r} with status {frame.status!s}"
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)
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frame.status = FrameStatus.PENDING
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frame.metadata.pop("blocked_on", None)
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enqueue_frame(run, frame_id, front=front)
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def resolve_no_ready_frames(run: RunState) -> RunStatus:
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"""Classify an empty ready queue into a terminal or blocked run state."""
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if run.status == RunStatus.INTERRUPTED:
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return RunStatus.INTERRUPTED
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if any(frame.status == FrameStatus.FAILED for frame in run.frames.values()):
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return RunStatus.FAILED
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if run.frames and all(
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frame.status == FrameStatus.COMPLETED for frame in run.frames.values()
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):
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return RunStatus.COMPLETED
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if any(frame.status == FrameStatus.BLOCKED for frame in run.frames.values()):
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raise WorkflowExecutionError("run has no ready frames and is deadlocked")
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raise WorkflowExecutionError("run has no ready frames")
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def _frame(run: RunState, frame_id: str) -> ExecutionFrame:
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frame = run.frames.get(frame_id)
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if frame is None:
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raise WorkflowExecutionError(f"unknown frame id {frame_id!r}")
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return frame
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```
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- [ ] **Step 4: Verify helper tests**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py -q
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```
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Expected: pass.
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---
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### Task 3: Initialize Root Through Scheduler
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**Files:**
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- Modify: `src/wf_core/runtime/ops/runs.py`
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- Test: `tests/core/test_scheduler.py`
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- [ ] **Step 1: Add root initialization test**
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Append:
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```python
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from wf_core import SchemaRef, StateSchema, Workflow
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from wf_core.runtime.ops.runs import create_run_state
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def test_create_run_state_queues_root_frame() -> None:
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workflow = Workflow(
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name="demo",
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input_schema=SchemaRef(properties={}),
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state_schema=StateSchema(fields={}),
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output_schema=SchemaRef(properties={}),
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node_defs=[],
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start="first",
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nodes=[],
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edges=[],
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)
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run = create_run_state(workflow, {})
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assert run.current_frame_id == "root"
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assert run.current_node_id == "first"
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assert run.ready_frame_ids == ["root"]
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assert run.frames["root"].status == FrameStatus.PENDING
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```
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- [ ] **Step 2: Run failing test if needed**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py::test_create_run_state_queues_root_frame -q
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```
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Expected: fails until root ready queue initialization exists.
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- [ ] **Step 3: Update run creation**
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In `src/wf_core/runtime/ops/runs.py`, create the root frame through `add_frame(..., ready=True)` and set compatibility cursor fields.
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- [ ] **Step 4: Verify**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py -q
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```
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Expected: pass.
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---
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### Task 4: Re-Enqueue Normal Frame Advances
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**Files:**
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- Modify: `src/wf_core/runtime/ops/flow.py`
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- Modify: `src/wf_core/runtime/step.py`
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- Test: `tests/core/test_scheduler.py`
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- [ ] **Step 1: Add normal advance test**
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Append:
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```python
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from wf_core.runtime.ops.flow import advance_frame
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def test_advance_frame_requeues_non_terminal_frame() -> None:
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run = _run()
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add_frame(run, ExecutionFrame(id="root", kind="root", node_id="a"))
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run.current_frame_id = "root"
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run.sync_from_current_frame()
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frame = run.current_frame()
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frame.status = FrameStatus.RUNNING
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advance_frame(run, frame, outcome="ok", next_node_id="b")
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assert frame.status == FrameStatus.PENDING
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assert run.ready_frame_ids == ["root"]
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assert run.current_node_id == "b"
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```
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- [ ] **Step 2: Run failing test**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py::test_advance_frame_requeues_non_terminal_frame -q
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```
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Expected: fails because `advance_frame` currently leaves non-terminal status as running and does not enqueue.
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- [ ] **Step 3: Update `advance_frame`**
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In `src/wf_core/runtime/ops/flow.py`, after setting node state:
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```python
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from wf_core.runtime.scheduler import mark_frame_pending
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```
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Use:
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```python
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if next_node_id == END:
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frame.status = FrameStatus.COMPLETED
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frame.finished_at_node_id = END
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else:
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frame.finished_at_node_id = None
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mark_frame_pending(run, frame.id)
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run.sync_from_current_frame()
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```
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- [ ] **Step 4: Verify focused tests**
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Run:
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```bash
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uv run pytest tests/core/test_scheduler.py -q
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```
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Expected: pass.
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---
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### Task 5: Migrate Engine Loops To Scheduler Selection
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**Files:**
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- Modify: `src/wf_core/runtime/engine.py`
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- Modify: `src/wf_core/runtime/preparation.py`
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- Modify: `src/wf_core/runtime/step.py`
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- Test: existing workflow tests
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- [ ] **Step 1: Add regression tests if existing coverage is insufficient**
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Before adding new tests, run:
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```bash
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uv run pytest tests/authoring/test_demo_workflow.py tests/core/test_scheduler.py -q
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```
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Expected before implementation: likely failures after Task 4 until engine selection is updated.
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- [ ] **Step 2: Update engine loops**
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Change `resume_workflow` and `resume_workflow_async` to:
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```python
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while True:
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frame = select_next_frame(run)
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if frame is None:
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status = resolve_no_ready_frames(run)
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if status == RunStatus.COMPLETED:
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break
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return run
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step_workflow(...)
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if run.status == RunStatus.INTERRUPTED:
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return run
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```
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Use the same selection flow in the async loop before `await step_workflow_async(...)`.
|
||
|
||
- [ ] **Step 3: Remove stack-style frame collapse from step preparation**
|
||
|
||
In `prepare_step`, remove old stack-style frame collapse and keep it focused on resolving the selected frame’s node. It should still return `None` for interrupted/end states.
|
||
|
||
- [ ] **Step 4: Verify serial workflows**
|
||
|
||
Run:
|
||
|
||
```bash
|
||
uv run pytest tests/authoring/test_demo_workflow.py tests/core/test_scheduler.py -q
|
||
```
|
||
|
||
Expected: pass.
|
||
|
||
---
|
||
|
||
### Task 6: Make Serial Foreach Use Block/Wake
|
||
|
||
**Files:**
|
||
|
||
- Modify: `src/wf_core/runtime/ops/foreach.py`
|
||
- Modify: `src/wf_core/runtime/ops/frames.py`
|
||
- Create or extend: `tests/core/test_scheduler.py`
|
||
- Test: `tests/authoring/test_demo_workflow.py`
|
||
|
||
- [ ] **Step 1: Add foreach block/wake regression test**
|
||
|
||
Add a focused test using an existing demo workflow or a small builder workflow that asserts:
|
||
|
||
```python
|
||
foreach_entries = [entry for entry in run.trace if entry.step_type == "foreach"]
|
||
assert foreach_entries
|
||
assert all(frame.status != FrameStatus.BLOCKED for frame in run.frames.values())
|
||
assert any(frame.kind == "foreach_iteration" for frame in run.frames.values())
|
||
```
|
||
|
||
Then add a lower-level test if needed for child completion waking parent:
|
||
|
||
```python
|
||
def test_child_completion_wakes_blocked_parent() -> None:
|
||
run = _run()
|
||
add_frame(run, ExecutionFrame(id="parent", kind="root", node_id="foreach"))
|
||
add_frame(
|
||
run,
|
||
ExecutionFrame(
|
||
id="child",
|
||
kind="foreach_iteration",
|
||
node_id="__end__",
|
||
parent_frame_id="parent",
|
||
),
|
||
)
|
||
block_frame_on_children(run, "parent", ("child",))
|
||
run.frames["child"].status = FrameStatus.COMPLETED
|
||
|
||
wake_parent_if_children_complete(run, "child")
|
||
|
||
assert run.frames["parent"].status == FrameStatus.PENDING
|
||
assert run.ready_frame_ids == ["parent"]
|
||
```
|
||
|
||
- [ ] **Step 2: Implement typed foreach metadata**
|
||
|
||
In `src/wf_core/runtime/scheduler.py` or a small sibling module if the file grows too large:
|
||
|
||
```python
|
||
@dataclass(slots=True, frozen=True)
|
||
class ForeachIterationMetadata:
|
||
foreach_node_id: str
|
||
loop_index: int
|
||
loop_item: object
|
||
loop_alias: str
|
||
|
||
@classmethod
|
||
def from_frame(cls, frame: ExecutionFrame) -> "ForeachIterationMetadata | None":
|
||
if frame.kind != "foreach_iteration":
|
||
return None
|
||
...
|
||
|
||
def to_metadata(self) -> dict[str, object]:
|
||
...
|
||
```
|
||
|
||
Wrong frame kind returns `None`; malformed foreach iteration metadata raises `WorkflowExecutionError`.
|
||
|
||
- [ ] **Step 3: Implement parent wake helper**
|
||
|
||
Add:
|
||
|
||
```python
|
||
def wake_parent_if_children_complete(run: RunState, child_frame_id: str) -> None:
|
||
child = _frame(run, child_frame_id)
|
||
parent_id = child.parent_frame_id
|
||
if parent_id is None:
|
||
return
|
||
parent = _frame(run, parent_id)
|
||
block = BlockedOnChildren.from_frame(parent)
|
||
if block is None:
|
||
return
|
||
if all(run.frames[item].status == FrameStatus.COMPLETED for item in block.child_frame_ids):
|
||
wake_frame(run, parent_id)
|
||
```
|
||
|
||
- [ ] **Step 4: Update foreach child creation**
|
||
|
||
In `step_foreach`, replace direct `run.frames[child_id] = ...` with `add_frame(..., ready=True)`, then call `block_frame_on_children(run, frame.id, (child_id,))`. Parent should not stay in ready queue while child runs.
|
||
|
||
- [ ] **Step 5: Verify foreach behavior**
|
||
|
||
Run:
|
||
|
||
```bash
|
||
uv run pytest tests/authoring/test_demo_workflow.py tests/core/test_scheduler.py -q
|
||
```
|
||
|
||
Expected: pass.
|
||
|
||
---
|
||
|
||
### Task 7: Resume Interrupt Through Ready Queue
|
||
|
||
**Files:**
|
||
|
||
- Modify: `src/wf_core/runtime/preparation.py`
|
||
- Modify: `src/wf_core/runtime/ops/interrupts.py`
|
||
- Test: existing interrupt tests or new focused tests
|
||
|
||
- [ ] **Step 1: Find existing interrupt tests**
|
||
|
||
Run:
|
||
|
||
```bash
|
||
rg -n "interrupt|resume_payload|resume_outcome" tests src -g '*.py'
|
||
```
|
||
|
||
- [ ] **Step 2: Add/adjust test for resume priority**
|
||
|
||
Add a focused test that creates an interrupted frame plus another ready frame and verifies resume places interrupted frame first:
|
||
|
||
```python
|
||
def test_resume_wakes_interrupted_frame_at_front() -> None:
|
||
run = _run()
|
||
add_frame(run, ExecutionFrame(id="waiting", kind="root", node_id="ask"))
|
||
add_frame(run, ExecutionFrame(id="sibling", kind="root", node_id="work"))
|
||
run.frames["waiting"].status = FrameStatus.INTERRUPTED
|
||
run.frames["sibling"].status = FrameStatus.PENDING
|
||
run.ready_frame_ids = ["sibling"]
|
||
|
||
wake_frame(run, "waiting", front=True)
|
||
|
||
assert run.ready_frame_ids == ["waiting", "sibling"]
|
||
```
|
||
|
||
- [ ] **Step 3: Update resume code**
|
||
|
||
After `resume_interrupt(...)`, wake/enqueue the resumed frame at the front. Keep one outstanding `run.interrupt`.
|
||
|
||
- [ ] **Step 4: Verify interrupt tests**
|
||
|
||
Run focused interrupt tests found in Step 1 plus:
|
||
|
||
```bash
|
||
uv run pytest tests/core/test_scheduler.py -q
|
||
```
|
||
|
||
Expected: pass.
|
||
|
||
---
|
||
|
||
### Task 8: Full Verification
|
||
|
||
**Files:**
|
||
|
||
- Potentially update docs if implementation differs from ADR.
|
||
|
||
- [ ] **Step 1: Run focused workflow tests**
|
||
|
||
Run:
|
||
|
||
```bash
|
||
uv run pytest tests/core/test_scheduler.py tests/authoring/test_demo_workflow.py -q
|
||
```
|
||
|
||
Expected: pass.
|
||
|
||
- [ ] **Step 2: Run full test suite**
|
||
|
||
Run:
|
||
|
||
```bash
|
||
uv run pytest -q
|
||
```
|
||
|
||
Expected: pass, except known environment-only skips.
|
||
|
||
- [ ] **Step 3: Run lint/type checks**
|
||
|
||
Run:
|
||
|
||
```bash
|
||
uvx ruff check src tests
|
||
uv run basedpyright --level error
|
||
```
|
||
|
||
Expected: ruff passes and basedpyright reports 0 errors.
|
||
|
||
- [ ] **Step 4: Review docs**
|
||
|
||
Check:
|
||
|
||
```bash
|
||
git diff -- CONTEXT.md docs/adr/0001-scheduler-foundation-before-concurrent-foreach.md docs/current_roadmap.md
|
||
```
|
||
|
||
Expected: docs remain aligned with implemented first-pass behavior.
|
||
|
||
---
|
||
|
||
## Self-Review
|
||
|
||
- Spec coverage: ADR decisions are covered by tasks for `BLOCKED`, ready queue, scheduler helpers, sync/async engine migration, serial foreach block/wake, interrupt resume priority, and verification.
|
||
- Intentional gaps: no `foreach(mode="concurrent")`, no `ForeachConcurrentPolicy`, no lineage patches, no BarrierNode, and no public scheduler exports.
|
||
- Type consistency: helper names are stable across tasks: `add_frame`, `enqueue_frame`, `select_next_frame`, `mark_frame_pending`, `block_frame_on_children`, `wake_frame`, `wake_parent_if_children_complete`, and `resolve_no_ready_frames`.
|