dream_support.py

# Copyright (c) 2026 OceanBase.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Controlled model boundaries under the real Supervisor for Dream regressions."""

from __future__ import annotations

import asyncio
from contextlib import asynccontextmanager, suppress
from copy import copy
from functools import partial
from typing import cast
from weakref import WeakKeyDictionary

from sqlalchemy import func, select

from powercontext.builtin.artifacts.atomic_memory.extraction import (
    AtomicMemoryEvidence,
    AtomicMemoryExtractionInput,
    AtomicMemoryExtractionOutput,
    AtomicMemoryGenerationPipeline,
)
from powercontext.builtin.artifacts.atomic_memory.reconciliation import (
    AtomicMemoryReconciliationContent,
    AtomicMemoryReconciliationInput,
    AtomicMemoryReconciliationOutput,
)
from powercontext.builtin.dream.bindings import DREAM_OPERATIONS
from powercontext.builtin.inference import GenerationResult, StructuredGenerator, character_token_estimator
from powercontext.builtin.persistence.errors import ArtifactProcessingLeadershipLostError
from powercontext.builtin.persistence.tables import ARTIFACT_PROCESSING_INTENTS_TABLE
from powercontext.builtin.runtime import BuiltinRuntime
from powercontext.builtin.runtime.artifact_processing import ArtifactProcessingBinding
from powercontext.builtin.runtime.composition import open_builtin_runtime as open_runtime
from powercontext.builtin.runtime.processing_contracts import (
    ArtifactProcessingWorkerCompletion,
    ArtifactProcessingWorkerOutcome,
)
from powercontext.builtin.runtime.processing_execution import InvocationAlreadyHandled, ScopeInvocation
from powercontext.builtin.runtime.topic_memory_scope import topic_memory_processing_block

_controllers: WeakKeyDictionary[BuiltinRuntime, Controller] = WeakKeyDictionary()


class _IndependentMemoryReconciler:
    async def generate(self, request: AtomicMemoryReconciliationInput, /):
        return GenerationResult(
            output=AtomicMemoryReconciliationOutput(
                action="create",
                compared_ids=tuple(item.item_id for item in request.related),
                content=AtomicMemoryReconciliationContent(kind=request.proposal.kind, text=request.proposal.text),
                evidence_ids=request.proposal.evidence_ids,
                reason="Preserve each independent fixture fact and its exact Source evidence.",
            )
        )


def atomic_memory_pipeline(
    extractor: StructuredGenerator[AtomicMemoryExtractionInput, AtomicMemoryExtractionOutput],
) -> AtomicMemoryGenerationPipeline:
    return AtomicMemoryGenerationPipeline(
        extractor=extractor,
        reconciler=_IndependentMemoryReconciler(),
        estimator=character_token_estimator(),
    )


def memory_source_text(evidence: AtomicMemoryEvidence) -> str | None:
    content = evidence.content
    if isinstance(content, dict):
        text = content.get("content", content.get("text"))
        return text if isinstance(text, str) else None
    return content if isinstance(content, str) else None


class Handle:
    def __init__(self, controller, assignment):
        self.controller = controller
        self.assignment = assignment
        self.ready = asyncio.Event()
        self.task = asyncio.create_task(self.execute())

    async def execute(self):
        await self.ready.wait()
        assert self.controller.runtime is not None
        service = copy(self.controller.runtime._dream_service)
        assert service is not None
        service.processing = ScopeInvocation(self.assignment)
        try:
            await service.execute()
        except InvocationAlreadyHandled:
            pass
        except ArtifactProcessingLeadershipLostError:
            return ArtifactProcessingWorkerCompletion(ArtifactProcessingWorkerOutcome.LEADERSHIP_LOST)
        return ArtifactProcessingWorkerCompletion()

    async def wait(self):
        return await asyncio.shield(self.task)

    async def terminate(self):
        self.task.cancel()
        with suppress(asyncio.CancelledError):
            await self.task


class Controller:
    def __init__(self):
        self.runtime: BuiltinRuntime | None = None
        self.handles: list[Handle] = []

    async def start(self, assignment):
        handle = Handle(self, assignment)
        self.handles.append(handle)
        return handle


@asynccontextmanager
async def open_dream_runtime(config, *, controller: Controller | None = None, **kwargs):
    controller = Controller() if controller is None else controller
    bindings = tuple(
        ArtifactProcessingBinding(
            binding_name=cast(str, spec.binding),
            artifact_family=cast(str, spec.processing_family),
            launcher=controller,
            max_workers=4,
            worker_timeout_seconds=180,
            work_block=partial(topic_memory_processing_block, dream_enabled=config.runtime.dream_enabled)
            if spec.family == "topic-memory"
            else None,
        )
        for spec in {item.binding: item for item in DREAM_OPERATIONS if item.binding is not None}.values()
    )
    async with open_runtime(config, artifact_processing_bindings=bindings, **kwargs) as runtime:
        controller.runtime = runtime
        _controllers[runtime] = controller
        try:
            yield runtime
        finally:
            _controllers.pop(runtime, None)


async def process_pending(runtime: BuiltinRuntime) -> None:
    """Release one dispatched batch, retaining control over model race boundaries."""

    controller = _controllers[runtime]
    assert runtime._dream_service is not None
    async with runtime._dream_service.database.transaction() as connection:
        table = ARTIFACT_PROCESSING_INTENTS_TABLE
        pending = await connection.scalar(
            select(func.count()).select_from(table).where(table.c.requested_generation > table.c.handled_generation)
        )
    if not pending:
        return
    async with asyncio.timeout(15):
        while True:
            handles = [handle for handle in controller.handles if not handle.task.done()]
            if handles:
                break
            await asyncio.sleep(0.01)
    for handle in handles:
        handle.ready.set()
    await asyncio.gather(*(handle.task for handle in handles))