You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.0 KiB
69 lines
2.0 KiB
# -*- coding: utf-8 -*-
|
|
"""Module holding utility and convenience functions for zmq event monitoring."""
|
|
|
|
# Copyright (C) PyZMQ Developers
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
import struct
|
|
import zmq
|
|
from zmq.error import _check_version
|
|
|
|
def parse_monitor_message(msg):
|
|
"""decode zmq_monitor event messages.
|
|
|
|
Parameters
|
|
----------
|
|
msg : list(bytes)
|
|
zmq multipart message that has arrived on a monitor PAIR socket.
|
|
|
|
First frame is::
|
|
|
|
16 bit event id
|
|
32 bit event value
|
|
no padding
|
|
|
|
Second frame is the endpoint as a bytestring
|
|
|
|
Returns
|
|
-------
|
|
event : dict
|
|
event description as dict with the keys `event`, `value`, and `endpoint`.
|
|
"""
|
|
|
|
if len(msg) != 2 or len(msg[0]) != 6:
|
|
raise RuntimeError("Invalid event message format: %s" % msg)
|
|
event = {'event': struct.unpack("=hi", msg[0])[0],
|
|
'value': struct.unpack("=hi", msg[0])[1],
|
|
'endpoint': msg[1]}
|
|
return event
|
|
|
|
def recv_monitor_message(socket, flags=0):
|
|
"""Receive and decode the given raw message from the monitoring socket and return a dict.
|
|
|
|
Requires libzmq ≥ 4.0
|
|
|
|
The returned dict will have the following entries:
|
|
event : int, the event id as described in libzmq.zmq_socket_monitor
|
|
value : int, the event value associated with the event, see libzmq.zmq_socket_monitor
|
|
endpoint : string, the affected endpoint
|
|
|
|
Parameters
|
|
----------
|
|
socket : zmq PAIR socket
|
|
The PAIR socket (created by other.get_monitor_socket()) on which to recv the message
|
|
flags : bitfield (int)
|
|
standard zmq recv flags
|
|
|
|
Returns
|
|
-------
|
|
event : dict
|
|
event description as dict with the keys `event`, `value`, and `endpoint`.
|
|
"""
|
|
_check_version((4,0), 'libzmq event API')
|
|
# will always return a list
|
|
msg = socket.recv_multipart(flags)
|
|
# 4.0-style event API
|
|
return parse_monitor_message(msg)
|
|
|
|
__all__ = ['parse_monitor_message', 'recv_monitor_message']
|