Restructure embeddings (#14266)

* Restructure embeddings

* Use ZMQ to proxy embeddings requests

* Handle serialization

* Formatting

* Remove unused

frigate/comms/embeddings_updater.py

@@ -0,0 +1,62 @@
+"""Facilitates communication between processes."""
+
+from enum import Enum
+from typing import Callable
+
+import zmq
+
+SOCKET_REP_REQ = "ipc:///tmp/cache/embeddings"
+
+
+class EmbeddingsRequestEnum(Enum):
+    embed_description = "embed_description"
+    embed_thumbnail = "embed_thumbnail"
+    generate_search = "generate_search"
+
+
+class EmbeddingsResponder:
+    def __init__(self) -> None:
+        self.context = zmq.Context()
+        self.socket = self.context.socket(zmq.REP)
+        self.socket.bind(SOCKET_REP_REQ)
+
+    def check_for_request(self, process: Callable) -> None:
+        while True:  # load all messages that are queued
+            has_message, _, _ = zmq.select([self.socket], [], [], 1)
+
+            if not has_message:
+                break
+
+            try:
+                (topic, value) = self.socket.recv_json(flags=zmq.NOBLOCK)
+
+                response = process(topic, value)
+
+                if response is not None:
+                    self.socket.send_json(response)
+                else:
+                    self.socket.send_json([])
+            except zmq.ZMQError:
+                break
+
+    def stop(self) -> None:
+        self.socket.close()
+        self.context.destroy()
+
+
+class EmbeddingsRequestor:
+    """Simplifies sending data to EmbeddingsResponder and getting a reply."""
+
+    def __init__(self) -> None:
+        self.context = zmq.Context()
+        self.socket = self.context.socket(zmq.REQ)
+        self.socket.connect(SOCKET_REP_REQ)
+
+    def send_data(self, topic: str, data: any) -> str:
+        """Sends data and then waits for reply."""
+        self.socket.send_json((topic, data))
+        return self.socket.recv_json()
+
+    def stop(self) -> None:
+        self.socket.close()
+        self.context.destroy()