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# Copyright 2017 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import threading
import grpc
from grpc_testing import _common
logging.basicConfig()
_LOGGER = logging.getLogger(__name__)
class Rpc(object):
def __init__(self, handler, invocation_metadata):
self._condition = threading.Condition()
self._handler = handler
self._invocation_metadata = invocation_metadata
self._initial_metadata_sent = False
self._pending_trailing_metadata = None
self._pending_code = None
self._pending_details = None
self._callbacks = []
self._active = True
self._rpc_errors = []
def _ensure_initial_metadata_sent(self):
if not self._initial_metadata_sent:
self._handler.send_initial_metadata(_common.FUSSED_EMPTY_METADATA)
self._initial_metadata_sent = True
def _call_back(self):
callbacks = tuple(self._callbacks)
self._callbacks = None
def call_back():
for callback in callbacks:
try:
callback()
except Exception: # pylint: disable=broad-except
_LOGGER.exception('Exception calling server-side callback!')
callback_calling_thread = threading.Thread(target=call_back)
callback_calling_thread.start()
def _terminate(self, trailing_metadata, code, details):
if self._active:
self._active = False
self._handler.send_termination(trailing_metadata, code, details)
self._call_back()
self._condition.notify_all()
def _complete(self):
if self._pending_trailing_metadata is None:
trailing_metadata = _common.FUSSED_EMPTY_METADATA
else:
trailing_metadata = self._pending_trailing_metadata
if self._pending_code is None:
code = grpc.StatusCode.OK
else:
code = self._pending_code
details = '' if self._pending_details is None else self._pending_details
self._terminate(trailing_metadata, code, details)
def _abort(self, code, details):
self._terminate(_common.FUSSED_EMPTY_METADATA, code, details)
def add_rpc_error(self, rpc_error):
with self._condition:
self._rpc_errors.append(rpc_error)
def application_cancel(self):
with self._condition:
self._abort(grpc.StatusCode.CANCELLED,
'Cancelled by server-side application!')
def application_exception_abort(self, exception):
with self._condition:
if exception not in self._rpc_errors:
_LOGGER.exception('Exception calling application!')
self._abort(
grpc.StatusCode.UNKNOWN,
'Exception calling application: {}'.format(exception))
def extrinsic_abort(self):
with self._condition:
if self._active:
self._active = False
self._call_back()
self._condition.notify_all()
def unary_response_complete(self, response):
with self._condition:
self._ensure_initial_metadata_sent()
self._handler.add_response(response)
self._complete()
def stream_response(self, response):
with self._condition:
self._ensure_initial_metadata_sent()
self._handler.add_response(response)
def stream_response_complete(self):
with self._condition:
self._ensure_initial_metadata_sent()
self._complete()
def send_initial_metadata(self, initial_metadata):
with self._condition:
if self._initial_metadata_sent:
return False
else:
self._handler.send_initial_metadata(initial_metadata)
self._initial_metadata_sent = True
return True
def is_active(self):
with self._condition:
return self._active
def add_callback(self, callback):
with self._condition:
if self._callbacks is None:
return False
else:
self._callbacks.append(callback)
return True
def invocation_metadata(self):
with self._condition:
return self._invocation_metadata
def set_trailing_metadata(self, trailing_metadata):
with self._condition:
self._pending_trailing_metadata = trailing_metadata
def set_code(self, code):
with self._condition:
self._pending_code = code
def set_details(self, details):
with self._condition:
self._pending_details = details
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