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# Copyright 2015-2016, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
cimport cpython
import threading
import time
cdef class CompletionQueue:
def __cinit__(self):
with nogil:
self.c_completion_queue = grpc_completion_queue_create(NULL)
self.is_shutting_down = False
self.is_shutdown = False
self.pluck_condition = threading.Condition()
self.num_plucking = 0
self.num_polling = 0
cdef _interpret_event(self, grpc_event event):
cdef OperationTag tag = None
cdef object user_tag = None
cdef Call operation_call = None
cdef CallDetails request_call_details = None
cdef Metadata request_metadata = None
cdef Operations batch_operations = None
if event.type == GRPC_QUEUE_TIMEOUT:
return Event(
event.type, False, None, None, None, None, False, None)
elif event.type == GRPC_QUEUE_SHUTDOWN:
self.is_shutdown = True
return Event(
event.type, True, None, None, None, None, False, None)
else:
if event.tag != NULL:
tag = <OperationTag>event.tag
# We receive event tags only after they've been inc-ref'd elsewhere in
# the code.
cpython.Py_DECREF(tag)
if tag.shutting_down_server is not None:
tag.shutting_down_server.notify_shutdown_complete()
user_tag = tag.user_tag
operation_call = tag.operation_call
request_call_details = tag.request_call_details
request_metadata = tag.request_metadata
batch_operations = tag.batch_operations
if tag.is_new_request:
# Stuff in the tag not explicitly handled by us needs to live through
# the life of the call
operation_call.references.extend(tag.references)
return Event(
event.type, event.success, user_tag, operation_call,
request_call_details, request_metadata, tag.is_new_request,
batch_operations)
def poll(self, Timespec deadline=None):
# We name this 'poll' to avoid problems with CPython's expectations for
# 'special' methods (like next and __next__).
cdef gpr_timespec c_deadline
with nogil:
c_deadline = gpr_inf_future(GPR_CLOCK_REALTIME)
if deadline is not None:
c_deadline = deadline.c_time
cdef grpc_event event
# Poll within a critical section to detect contention
with self.pluck_condition:
assert self.num_plucking == 0, 'cannot simultaneously pluck and poll'
self.num_polling += 1
with nogil:
event = grpc_completion_queue_next(
self.c_completion_queue, c_deadline, NULL)
with self.pluck_condition:
self.num_polling -= 1
return self._interpret_event(event)
def pluck(self, OperationTag tag, Timespec deadline=None):
# Plucking a 'None' tag is equivalent to passing control to GRPC core until
# the deadline.
cdef gpr_timespec c_deadline = gpr_inf_future(
GPR_CLOCK_REALTIME)
if deadline is not None:
c_deadline = deadline.c_time
cdef grpc_event event
# Pluck within a critical section to detect contention
with self.pluck_condition:
assert self.num_polling == 0, 'cannot simultaneously pluck and poll'
assert self.num_plucking < GRPC_MAX_COMPLETION_QUEUE_PLUCKERS, (
'cannot pluck more than {} times simultaneously'.format(
GRPC_MAX_COMPLETION_QUEUE_PLUCKERS))
self.num_plucking += 1
with nogil:
event = grpc_completion_queue_pluck(
self.c_completion_queue, <cpython.PyObject *>tag, c_deadline, NULL)
with self.pluck_condition:
self.num_plucking -= 1
return self._interpret_event(event)
def shutdown(self):
with nogil:
grpc_completion_queue_shutdown(self.c_completion_queue)
self.is_shutting_down = True
def clear(self):
if not self.is_shutting_down:
raise ValueError('queue must be shutting down to be cleared')
while self.poll().type != GRPC_QUEUE_SHUTDOWN:
pass
def __dealloc__(self):
cdef gpr_timespec c_deadline
with nogil:
c_deadline = gpr_inf_future(GPR_CLOCK_REALTIME)
if self.c_completion_queue != NULL:
# Ensure shutdown
if not self.is_shutting_down:
with nogil:
grpc_completion_queue_shutdown(self.c_completion_queue)
# Pump the queue
while not self.is_shutdown:
with nogil:
event = grpc_completion_queue_next(
self.c_completion_queue, c_deadline, NULL)
self._interpret_event(event)
with nogil:
grpc_completion_queue_destroy(self.c_completion_queue)
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