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129 lines
3.2 KiB
Python
129 lines
3.2 KiB
Python
"""Module holding utility and convenience functions for zmq event monitoring."""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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from __future__ import annotations
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import struct
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from typing import Awaitable, TypedDict, overload
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import zmq
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import zmq.asyncio
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from zmq.error import _check_version
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class _MonitorMessage(TypedDict):
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event: int
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value: int
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endpoint: bytes
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def parse_monitor_message(msg: list[bytes]) -> _MonitorMessage:
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"""decode zmq_monitor event messages.
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Parameters
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----------
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msg : list(bytes)
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zmq multipart message that has arrived on a monitor PAIR socket.
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First frame is::
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16 bit event id
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32 bit event value
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no padding
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Second frame is the endpoint as a bytestring
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Returns
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-------
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event : dict
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event description as dict with the keys `event`, `value`, and `endpoint`.
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"""
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if len(msg) != 2 or len(msg[0]) != 6:
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raise RuntimeError(f"Invalid event message format: {msg}")
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event_id, value = struct.unpack("=hi", msg[0])
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event: _MonitorMessage = {
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'event': zmq.Event(event_id),
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'value': zmq.Event(value),
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'endpoint': msg[1],
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}
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return event
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async def _parse_monitor_msg_async(
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awaitable_msg: Awaitable[list[bytes]],
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) -> _MonitorMessage:
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"""Like parse_monitor_msg, but awaitable
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Given awaitable message, return awaitable for the parsed monitor message.
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"""
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msg = await awaitable_msg
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# 4.0-style event API
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return parse_monitor_message(msg)
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@overload
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def recv_monitor_message(
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socket: zmq.asyncio.Socket,
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flags: int = 0,
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) -> Awaitable[_MonitorMessage]: ...
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@overload
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def recv_monitor_message(
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socket: zmq.Socket[bytes],
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flags: int = 0,
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) -> _MonitorMessage: ...
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def recv_monitor_message(
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socket: zmq.Socket,
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flags: int = 0,
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) -> _MonitorMessage | Awaitable[_MonitorMessage]:
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"""Receive and decode the given raw message from the monitoring socket and return a dict.
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Requires libzmq ≥ 4.0
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The returned dict will have the following entries:
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event : int
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the event id as described in `libzmq.zmq_socket_monitor`
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value : int
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the event value associated with the event, see `libzmq.zmq_socket_monitor`
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endpoint : str
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the affected endpoint
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.. versionchanged:: 23.1
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Support for async sockets added.
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When called with a async socket,
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returns an awaitable for the monitor message.
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Parameters
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----------
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socket : zmq.Socket
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The PAIR socket (created by other.get_monitor_socket()) on which to recv the message
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flags : int
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standard zmq recv flags
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Returns
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-------
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event : dict
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event description as dict with the keys `event`, `value`, and `endpoint`.
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"""
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_check_version((4, 0), 'libzmq event API')
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# will always return a list
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msg = socket.recv_multipart(flags)
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# transparently handle asyncio socket,
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# returns a Future instead of a dict
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if isinstance(msg, Awaitable):
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return _parse_monitor_msg_async(msg)
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# 4.0-style event API
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return parse_monitor_message(msg)
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__all__ = ['parse_monitor_message', 'recv_monitor_message']
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