major refactor

core/rpc/client.py

@@ -0,0 +1,204 @@
+"""
+gRPC Client - Used by FastAPI to communicate with workers.
+"""
+
+import json
+import logging
+import os
+from typing import Callable, Iterator, Optional
+
+import grpc
+
+# Generated stubs - run `python schema/generate.py --proto` if missing
+from . import worker_pb2, worker_pb2_grpc
+
+logger = logging.getLogger(__name__)
+
+# Configuration from environment
+GRPC_HOST = os.environ.get("GRPC_HOST", "grpc")
+GRPC_PORT = int(os.environ.get("GRPC_PORT", "50051"))
+
+
+class WorkerClient:
+    """gRPC client for worker communication."""
+
+    def __init__(self, host: str = None, port: int = None):
+        """
+        Initialize the client.
+
+        Args:
+            host: gRPC server host (defaults to GRPC_HOST env var)
+            port: gRPC server port (defaults to GRPC_PORT env var)
+        """
+        self.host = host or GRPC_HOST
+        self.port = port or GRPC_PORT
+        self.address = f"{self.host}:{self.port}"
+        self._channel: Optional[grpc.Channel] = None
+        self._stub: Optional[worker_pb2_grpc.WorkerServiceStub] = None
+
+    def _ensure_connected(self) -> worker_pb2_grpc.WorkerServiceStub:
+        """Ensure channel is connected and return stub."""
+        if self._channel is None:
+            self._channel = grpc.insecure_channel(self.address)
+            self._stub = worker_pb2_grpc.WorkerServiceStub(self._channel)
+        return self._stub
+
+    def close(self) -> None:
+        """Close the channel."""
+        if self._channel:
+            self._channel.close()
+            self._channel = None
+            self._stub = None
+
+    def __enter__(self):
+        self._ensure_connected()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+
+    def submit_job(
+        self,
+        job_id: str,
+        source_path: str,
+        output_path: str,
+        preset: Optional[dict] = None,
+        trim_start: Optional[float] = None,
+        trim_end: Optional[float] = None,
+    ) -> tuple[bool, str]:
+        """
+        Submit a job to the worker.
+
+        Args:
+            job_id: Unique job identifier
+            source_path: Path to source file
+            output_path: Path for output file
+            preset: Transcode preset dict (optional)
+            trim_start: Trim start time in seconds (optional)
+            trim_end: Trim end time in seconds (optional)
+
+        Returns:
+            Tuple of (accepted: bool, message: str)
+        """
+        stub = self._ensure_connected()
+
+        request = worker_pb2.JobRequest(
+            job_id=job_id,
+            source_path=source_path,
+            output_path=output_path,
+            preset_json=json.dumps(preset) if preset else "",
+        )
+
+        if trim_start is not None:
+            request.trim_start = trim_start
+        if trim_end is not None:
+            request.trim_end = trim_end
+
+        try:
+            response = stub.SubmitJob(request)
+            return response.accepted, response.message
+        except grpc.RpcError as e:
+            logger.error(f"SubmitJob RPC failed: {e}")
+            return False, str(e)
+
+    def stream_progress(
+        self,
+        job_id: str,
+        callback: Optional[Callable[[dict], None]] = None,
+    ) -> Iterator[dict]:
+        """
+        Stream progress updates for a job.
+
+        Args:
+            job_id: Job identifier
+            callback: Optional callback for each update
+
+        Yields:
+            Progress update dicts
+        """
+        stub = self._ensure_connected()
+
+        request = worker_pb2.ProgressRequest(job_id=job_id)
+
+        try:
+            for update in stub.StreamProgress(request):
+                progress = {
+                    "job_id": update.job_id,
+                    "progress": update.progress,
+                    "current_frame": update.current_frame,
+                    "current_time": update.current_time,
+                    "speed": update.speed,
+                    "status": update.status,
+                    "error": update.error if update.HasField("error") else None,
+                }
+
+                if callback:
+                    callback(progress)
+
+                yield progress
+
+                if update.status in ("completed", "failed", "cancelled"):
+                    break
+
+        except grpc.RpcError as e:
+            logger.error(f"StreamProgress RPC failed: {e}")
+            yield {
+                "job_id": job_id,
+                "progress": 0,
+                "status": "error",
+                "error": str(e),
+            }
+
+    def cancel_job(self, job_id: str) -> tuple[bool, str]:
+        """
+        Cancel a running job.
+
+        Args:
+            job_id: Job identifier
+
+        Returns:
+            Tuple of (cancelled: bool, message: str)
+        """
+        stub = self._ensure_connected()
+
+        request = worker_pb2.CancelRequest(job_id=job_id)
+
+        try:
+            response = stub.CancelJob(request)
+            return response.cancelled, response.message
+        except grpc.RpcError as e:
+            logger.error(f"CancelJob RPC failed: {e}")
+            return False, str(e)
+
+    def get_worker_status(self) -> Optional[dict]:
+        """
+        Get worker status and capabilities.
+
+        Returns:
+            Status dict or None on error
+        """
+        stub = self._ensure_connected()
+
+        try:
+            response = stub.GetWorkerStatus(worker_pb2.Empty())
+            return {
+                "available": response.available,
+                "active_jobs": response.active_jobs,
+                "supported_codecs": list(response.supported_codecs),
+                "gpu_available": response.gpu_available,
+            }
+        except grpc.RpcError as e:
+            logger.error(f"GetWorkerStatus RPC failed: {e}")
+            return None
+
+
+# Singleton client instance
+_client: Optional[WorkerClient] = None
+
+
+def get_client() -> WorkerClient:
+    """Get or create the singleton client (uses env vars for config)."""
+    global _client
+    if _client is None:
+        _client = WorkerClient()
+    return _client