feat: Add Async Job Scheduler

llama_stack/providers/utils/job_scheduler/celery/scheduler.py

@@ -0,0 +1,81 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from collections.abc import Awaitable, Callable
+
+from ..api import JobStatus, Scheduler
+from ..config import CelerySchedulerConfig
+
+
+class CelerySchedulerImpl(Scheduler):
+    """
+    Celery-based scheduler implementation for distributed multi-worker deployments.
+
+    This scheduler uses Celery to distribute jobs across multiple worker processes
+    or machines. It provides:
+    - Persistent job queue (via Redis/RabbitMQ broker)
+    - Multi-worker coordination
+    - Crash recovery (jobs survive server restarts)
+    - Distributed task execution
+
+    This is suitable for:
+    - Production deployments
+    - Multi-worker scenarios
+    - High availability requirements
+    """
+
+    def __init__(self, config: CelerySchedulerConfig):
+        self.config = config
+        self._job_executors: dict[str, Callable[[dict], Awaitable[dict]]] = {}
+        # TODO: Initialize Celery app with broker and result backend
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    def register_job_executor(
+        self,
+        job_type: str,
+        executor: Callable[[dict], Awaitable[dict]],
+    ) -> None:
+        """Register a job executor function for a specific job type."""
+        self._job_executors[job_type] = executor
+
+    async def initialize(self) -> None:
+        """Initialize the Celery scheduler."""
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    async def shutdown(self) -> None:
+        """Gracefully shutdown the Celery scheduler."""
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    async def schedule_job(
+        self,
+        job_type: str,
+        job_data: dict,
+        metadata: dict | None = None,
+    ) -> str:
+        """Schedule a new job for execution via Celery."""
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    async def get_job_info(self, job_id: str) -> dict:
+        """Get complete information about a job from Celery result backend."""
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    async def cancel_job(self, job_id: str) -> bool:
+        """Cancel a pending or running Celery job."""
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    async def delete_job(self, job_id: str) -> bool:
+        """Delete a completed or cancelled job from Celery result backend."""
+        raise NotImplementedError("Celery scheduler not yet implemented")
+
+    async def list_jobs(
+        self,
+        job_type: str | None = None,
+        status: JobStatus | None = None,
+        limit: int = 100,
+        offset: int = 0,
+    ) -> list[dict]:
+        """List jobs from Celery result backend with optional filtering."""
+        raise NotImplementedError("Celery scheduler not yet implemented")