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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 time
cdef class Server:
def __cinit__(self, ChannelArgs arguments=None):
cdef grpc_channel_args *c_arguments = NULL
self.references = []
self.registered_completion_queues = []
if arguments is not None:
c_arguments = &arguments.c_args
self.references.append(arguments)
with nogil:
self.c_server = grpc_server_create(c_arguments, NULL)
self.is_started = False
self.is_shutting_down = False
self.is_shutdown = False
def request_call(
self, CompletionQueue call_queue not None,
CompletionQueue server_queue not None, tag):
if not self.is_started or self.is_shutting_down:
raise ValueError("server must be started and not shutting down")
if server_queue not in self.registered_completion_queues:
raise ValueError("server_queue must be a registered completion queue")
cdef grpc_call_error result
cdef OperationTag operation_tag = OperationTag(tag)
operation_tag.operation_call = Call()
operation_tag.request_call_details = CallDetails()
operation_tag.request_metadata = Metadata([])
operation_tag.references.extend([self, call_queue, server_queue])
operation_tag.is_new_request = True
operation_tag.batch_operations = Operations([])
cpython.Py_INCREF(operation_tag)
with nogil:
result = grpc_server_request_call(
self.c_server, &operation_tag.operation_call.c_call,
&operation_tag.request_call_details.c_details,
&operation_tag.request_metadata.c_metadata_array,
call_queue.c_completion_queue, server_queue.c_completion_queue,
<cpython.PyObject *>operation_tag)
return result
def register_completion_queue(
self, CompletionQueue queue not None):
if self.is_started:
raise ValueError("cannot register completion queues after start")
with nogil:
grpc_server_register_completion_queue(
self.c_server, queue.c_completion_queue, NULL)
self.registered_completion_queues.append(queue)
def start(self):
if self.is_started:
raise ValueError("the server has already started")
self.backup_shutdown_queue = CompletionQueue()
self.register_completion_queue(self.backup_shutdown_queue)
self.is_started = True
with nogil:
grpc_server_start(self.c_server)
# Ensure the core has gotten a chance to do the start-up work
self.backup_shutdown_queue.pluck(None, Timespec(None))
def add_http2_port(self, address,
ServerCredentials server_credentials=None):
if isinstance(address, bytes):
pass
elif isinstance(address, basestring):
address = address.encode()
else:
raise TypeError("expected address to be a str or bytes")
self.references.append(address)
cdef int result
cdef char *address_c_string = address
if server_credentials is not None:
self.references.append(server_credentials)
with nogil:
result = grpc_server_add_secure_http2_port(
self.c_server, address_c_string, server_credentials.c_credentials)
else:
with nogil:
result = grpc_server_add_insecure_http2_port(self.c_server,
address_c_string)
return result
cdef _c_shutdown(self, CompletionQueue queue, tag):
self.is_shutting_down = True
operation_tag = OperationTag(tag)
operation_tag.shutting_down_server = self
cpython.Py_INCREF(operation_tag)
with nogil:
grpc_server_shutdown_and_notify(
self.c_server, queue.c_completion_queue,
<cpython.PyObject *>operation_tag)
def shutdown(self, CompletionQueue queue not None, tag):
cdef OperationTag operation_tag
if queue.is_shutting_down:
raise ValueError("queue must be live")
elif not self.is_started:
raise ValueError("the server hasn't started yet")
elif self.is_shutting_down:
return
elif queue not in self.registered_completion_queues:
raise ValueError("expected registered completion queue")
else:
self._c_shutdown(queue, tag)
cdef notify_shutdown_complete(self):
# called only by a completion queue on receiving our shutdown operation tag
self.is_shutdown = True
def cancel_all_calls(self):
if not self.is_shutting_down:
raise RuntimeError("the server must be shutting down to cancel all calls")
elif self.is_shutdown:
return
else:
with nogil:
grpc_server_cancel_all_calls(self.c_server)
def __dealloc__(self):
if self.c_server != NULL:
if not self.is_started:
pass
elif self.is_shutdown:
pass
elif not self.is_shutting_down:
# the user didn't call shutdown - use our backup queue
self._c_shutdown(self.backup_shutdown_queue, None)
# and now we wait
while not self.is_shutdown:
self.backup_shutdown_queue.poll()
else:
# We're in the process of shutting down, but have not shutdown; can't do
# much but repeatedly release the GIL and wait
while not self.is_shutdown:
time.sleep(0)
with nogil:
grpc_server_destroy(self.c_server)
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