blakeblackshear.frigate/frigate/comms/events_updater.py

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"""Facilitates communication between processes."""
import zmq
from frigate.events.types import EventStateEnum, EventTypeEnum
SOCKET_PUSH_PULL = "ipc:///tmp/cache/events"
SOCKET_PUSH_PULL_END = "ipc:///tmp/cache/events_ended"
class EventUpdatePublisher:
"""Publishes events (objects, audio, manual)."""
def __init__(self) -> None:
self.context = zmq.Context()
self.socket = self.context.socket(zmq.PUSH)
self.socket.connect(SOCKET_PUSH_PULL)
def publish(
self, payload: tuple[EventTypeEnum, EventStateEnum, str, dict[str, any]]
) -> None:
"""There is no communication back to the processes."""
self.socket.send_json(payload)
def stop(self) -> None:
self.socket.close()
self.context.destroy()
class EventUpdateSubscriber:
"""Receives event updates."""
def __init__(self) -> None:
self.context = zmq.Context()
self.socket = self.context.socket(zmq.PULL)
self.socket.bind(SOCKET_PUSH_PULL)
def check_for_update(
self, timeout=1
) -> tuple[EventTypeEnum, EventStateEnum, str, dict[str, any]]:
"""Returns events or None if no update."""
try:
has_update, _, _ = zmq.select([self.socket], [], [], timeout)
if has_update:
return self.socket.recv_json()
except zmq.ZMQError:
pass
return None
def stop(self) -> None:
self.socket.close()
self.context.destroy()
class EventEndPublisher:
"""Publishes events that have ended."""
def __init__(self) -> None:
self.context = zmq.Context()
self.socket = self.context.socket(zmq.PUSH)
self.socket.connect(SOCKET_PUSH_PULL_END)
def publish(
self, payload: tuple[EventTypeEnum, EventStateEnum, str, dict[str, any]]
) -> None:
"""There is no communication back to the processes."""
self.socket.send_json(payload)
def stop(self) -> None:
self.socket.close()
self.context.destroy()
class EventEndSubscriber:
"""Receives events that have ended."""
def __init__(self) -> None:
self.context = zmq.Context()
self.socket = self.context.socket(zmq.PULL)
self.socket.bind(SOCKET_PUSH_PULL_END)
def check_for_update(
self, timeout=1
) -> tuple[EventTypeEnum, EventStateEnum, str, dict[str, any]]:
"""Returns events ended or None if no update."""
try:
has_update, _, _ = zmq.select([self.socket], [], [], timeout)
if has_update:
return self.socket.recv_json()
except zmq.ZMQError:
pass
return None
def stop(self) -> None:
self.socket.close()
self.context.destroy()