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from __future__ import absolute_import
import logging
import weakref
from .base import SubsystemBase
from ..errors import VIPError
from ..results import ResultsDictionary
__all__ = ['Ping']
_log = logging.getLogger(__name__)
[docs]class Ping(SubsystemBase):
def __init__(self, core):
self.core = weakref.ref(core)
self._results = ResultsDictionary()
core.register('ping', self._handle_ping, self._handle_error)
[docs] def ping(self, peer, *args):
socket = self.core().socket
result = next(self._results)
args = list(args)
args.insert(0, b'ping')
socket.send_vip(peer, b'ping', args, result.ident)
return result
__call__ = ping
def _handle_ping(self, message):
try:
op = bytes(message.args[0])
except IndexError:
_log.error('missing ping subsystem operation')
return
if op == b'ping':
message.user = b''
message.args[0] = b'pong'
self.core().socket.send_vip_object(message, copy=False)
elif op == b'pong':
try:
result = self._results.pop(bytes(message.id))
except KeyError:
return
result.set([bytes(arg) for arg in message.args[1:]])
else:
_log.error('unknown ping subsystem operation')
def _handle_error(self, sender, message, error, **kwargs):
try:
result = self._results.pop(bytes(message.id))
except KeyError:
return
result.set_exception(error)