390 lines
14 KiB
Python
390 lines
14 KiB
Python
# Copyright 2016 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.
|
|
"""Translates gRPC's server-side API into gRPC's server-side Beta API."""
|
|
|
|
import collections
|
|
import threading
|
|
|
|
import grpc
|
|
from grpc import _common
|
|
from grpc.beta import _metadata
|
|
from grpc.beta import interfaces
|
|
from grpc.framework.common import cardinality
|
|
from grpc.framework.common import style
|
|
from grpc.framework.foundation import abandonment
|
|
from grpc.framework.foundation import logging_pool
|
|
from grpc.framework.foundation import stream
|
|
from grpc.framework.interfaces.face import face
|
|
|
|
# pylint: disable=too-many-return-statements
|
|
|
|
_DEFAULT_POOL_SIZE = 8
|
|
|
|
|
|
class _ServerProtocolContext(interfaces.GRPCServicerContext):
|
|
|
|
def __init__(self, servicer_context):
|
|
self._servicer_context = servicer_context
|
|
|
|
def peer(self):
|
|
return self._servicer_context.peer()
|
|
|
|
def disable_next_response_compression(self):
|
|
pass # TODO(https://github.com/grpc/grpc/issues/4078): design, implement.
|
|
|
|
|
|
class _FaceServicerContext(face.ServicerContext):
|
|
|
|
def __init__(self, servicer_context):
|
|
self._servicer_context = servicer_context
|
|
|
|
def is_active(self):
|
|
return self._servicer_context.is_active()
|
|
|
|
def time_remaining(self):
|
|
return self._servicer_context.time_remaining()
|
|
|
|
def add_abortion_callback(self, abortion_callback):
|
|
raise NotImplementedError(
|
|
'add_abortion_callback no longer supported server-side!')
|
|
|
|
def cancel(self):
|
|
self._servicer_context.cancel()
|
|
|
|
def protocol_context(self):
|
|
return _ServerProtocolContext(self._servicer_context)
|
|
|
|
def invocation_metadata(self):
|
|
return _metadata.beta(self._servicer_context.invocation_metadata())
|
|
|
|
def initial_metadata(self, initial_metadata):
|
|
self._servicer_context.send_initial_metadata(
|
|
_metadata.unbeta(initial_metadata))
|
|
|
|
def terminal_metadata(self, terminal_metadata):
|
|
self._servicer_context.set_terminal_metadata(
|
|
_metadata.unbeta(terminal_metadata))
|
|
|
|
def code(self, code):
|
|
self._servicer_context.set_code(code)
|
|
|
|
def details(self, details):
|
|
self._servicer_context.set_details(details)
|
|
|
|
|
|
def _adapt_unary_request_inline(unary_request_inline):
|
|
|
|
def adaptation(request, servicer_context):
|
|
return unary_request_inline(request,
|
|
_FaceServicerContext(servicer_context))
|
|
|
|
return adaptation
|
|
|
|
|
|
def _adapt_stream_request_inline(stream_request_inline):
|
|
|
|
def adaptation(request_iterator, servicer_context):
|
|
return stream_request_inline(request_iterator,
|
|
_FaceServicerContext(servicer_context))
|
|
|
|
return adaptation
|
|
|
|
|
|
class _Callback(stream.Consumer):
|
|
|
|
def __init__(self):
|
|
self._condition = threading.Condition()
|
|
self._values = []
|
|
self._terminated = False
|
|
self._cancelled = False
|
|
|
|
def consume(self, value):
|
|
with self._condition:
|
|
self._values.append(value)
|
|
self._condition.notify_all()
|
|
|
|
def terminate(self):
|
|
with self._condition:
|
|
self._terminated = True
|
|
self._condition.notify_all()
|
|
|
|
def consume_and_terminate(self, value):
|
|
with self._condition:
|
|
self._values.append(value)
|
|
self._terminated = True
|
|
self._condition.notify_all()
|
|
|
|
def cancel(self):
|
|
with self._condition:
|
|
self._cancelled = True
|
|
self._condition.notify_all()
|
|
|
|
def draw_one_value(self):
|
|
with self._condition:
|
|
while True:
|
|
if self._cancelled:
|
|
raise abandonment.Abandoned()
|
|
elif self._values:
|
|
return self._values.pop(0)
|
|
elif self._terminated:
|
|
return None
|
|
else:
|
|
self._condition.wait()
|
|
|
|
def draw_all_values(self):
|
|
with self._condition:
|
|
while True:
|
|
if self._cancelled:
|
|
raise abandonment.Abandoned()
|
|
elif self._terminated:
|
|
all_values = tuple(self._values)
|
|
self._values = None
|
|
return all_values
|
|
else:
|
|
self._condition.wait()
|
|
|
|
|
|
def _run_request_pipe_thread(request_iterator, request_consumer,
|
|
servicer_context):
|
|
thread_joined = threading.Event()
|
|
|
|
def pipe_requests():
|
|
for request in request_iterator:
|
|
if not servicer_context.is_active() or thread_joined.is_set():
|
|
return
|
|
request_consumer.consume(request)
|
|
if not servicer_context.is_active() or thread_joined.is_set():
|
|
return
|
|
request_consumer.terminate()
|
|
|
|
request_pipe_thread = threading.Thread(target=pipe_requests)
|
|
request_pipe_thread.daemon = True
|
|
request_pipe_thread.start()
|
|
|
|
|
|
def _adapt_unary_unary_event(unary_unary_event):
|
|
|
|
def adaptation(request, servicer_context):
|
|
callback = _Callback()
|
|
if not servicer_context.add_callback(callback.cancel):
|
|
raise abandonment.Abandoned()
|
|
unary_unary_event(request, callback.consume_and_terminate,
|
|
_FaceServicerContext(servicer_context))
|
|
return callback.draw_all_values()[0]
|
|
|
|
return adaptation
|
|
|
|
|
|
def _adapt_unary_stream_event(unary_stream_event):
|
|
|
|
def adaptation(request, servicer_context):
|
|
callback = _Callback()
|
|
if not servicer_context.add_callback(callback.cancel):
|
|
raise abandonment.Abandoned()
|
|
unary_stream_event(request, callback,
|
|
_FaceServicerContext(servicer_context))
|
|
while True:
|
|
response = callback.draw_one_value()
|
|
if response is None:
|
|
return
|
|
else:
|
|
yield response
|
|
|
|
return adaptation
|
|
|
|
|
|
def _adapt_stream_unary_event(stream_unary_event):
|
|
|
|
def adaptation(request_iterator, servicer_context):
|
|
callback = _Callback()
|
|
if not servicer_context.add_callback(callback.cancel):
|
|
raise abandonment.Abandoned()
|
|
request_consumer = stream_unary_event(
|
|
callback.consume_and_terminate,
|
|
_FaceServicerContext(servicer_context))
|
|
_run_request_pipe_thread(request_iterator, request_consumer,
|
|
servicer_context)
|
|
return callback.draw_all_values()[0]
|
|
|
|
return adaptation
|
|
|
|
|
|
def _adapt_stream_stream_event(stream_stream_event):
|
|
|
|
def adaptation(request_iterator, servicer_context):
|
|
callback = _Callback()
|
|
if not servicer_context.add_callback(callback.cancel):
|
|
raise abandonment.Abandoned()
|
|
request_consumer = stream_stream_event(
|
|
callback, _FaceServicerContext(servicer_context))
|
|
_run_request_pipe_thread(request_iterator, request_consumer,
|
|
servicer_context)
|
|
while True:
|
|
response = callback.draw_one_value()
|
|
if response is None:
|
|
return
|
|
else:
|
|
yield response
|
|
|
|
return adaptation
|
|
|
|
|
|
class _SimpleMethodHandler(
|
|
collections.namedtuple('_MethodHandler', (
|
|
'request_streaming',
|
|
'response_streaming',
|
|
'request_deserializer',
|
|
'response_serializer',
|
|
'unary_unary',
|
|
'unary_stream',
|
|
'stream_unary',
|
|
'stream_stream',
|
|
)), grpc.RpcMethodHandler):
|
|
pass
|
|
|
|
|
|
def _simple_method_handler(implementation, request_deserializer,
|
|
response_serializer):
|
|
if implementation.style is style.Service.INLINE:
|
|
if implementation.cardinality is cardinality.Cardinality.UNARY_UNARY:
|
|
return _SimpleMethodHandler(False, False, request_deserializer,
|
|
response_serializer,
|
|
_adapt_unary_request_inline(
|
|
implementation.unary_unary_inline),
|
|
None, None, None)
|
|
elif implementation.cardinality is cardinality.Cardinality.UNARY_STREAM:
|
|
return _SimpleMethodHandler(False, True, request_deserializer,
|
|
response_serializer, None,
|
|
_adapt_unary_request_inline(
|
|
implementation.unary_stream_inline),
|
|
None, None)
|
|
elif implementation.cardinality is cardinality.Cardinality.STREAM_UNARY:
|
|
return _SimpleMethodHandler(True, False, request_deserializer,
|
|
response_serializer, None, None,
|
|
_adapt_stream_request_inline(
|
|
implementation.stream_unary_inline),
|
|
None)
|
|
elif implementation.cardinality is cardinality.Cardinality.STREAM_STREAM:
|
|
return _SimpleMethodHandler(
|
|
True, True, request_deserializer, response_serializer, None,
|
|
None, None,
|
|
_adapt_stream_request_inline(
|
|
implementation.stream_stream_inline))
|
|
elif implementation.style is style.Service.EVENT:
|
|
if implementation.cardinality is cardinality.Cardinality.UNARY_UNARY:
|
|
return _SimpleMethodHandler(False, False, request_deserializer,
|
|
response_serializer,
|
|
_adapt_unary_unary_event(
|
|
implementation.unary_unary_event),
|
|
None, None, None)
|
|
elif implementation.cardinality is cardinality.Cardinality.UNARY_STREAM:
|
|
return _SimpleMethodHandler(False, True, request_deserializer,
|
|
response_serializer, None,
|
|
_adapt_unary_stream_event(
|
|
implementation.unary_stream_event),
|
|
None, None)
|
|
elif implementation.cardinality is cardinality.Cardinality.STREAM_UNARY:
|
|
return _SimpleMethodHandler(True, False, request_deserializer,
|
|
response_serializer, None, None,
|
|
_adapt_stream_unary_event(
|
|
implementation.stream_unary_event),
|
|
None)
|
|
elif implementation.cardinality is cardinality.Cardinality.STREAM_STREAM:
|
|
return _SimpleMethodHandler(True, True, request_deserializer,
|
|
response_serializer, None, None, None,
|
|
_adapt_stream_stream_event(
|
|
implementation.stream_stream_event))
|
|
raise ValueError()
|
|
|
|
|
|
def _flatten_method_pair_map(method_pair_map):
|
|
method_pair_map = method_pair_map or {}
|
|
flat_map = {}
|
|
for method_pair in method_pair_map:
|
|
method = _common.fully_qualified_method(method_pair[0], method_pair[1])
|
|
flat_map[method] = method_pair_map[method_pair]
|
|
return flat_map
|
|
|
|
|
|
class _GenericRpcHandler(grpc.GenericRpcHandler):
|
|
|
|
def __init__(self, method_implementations, multi_method_implementation,
|
|
request_deserializers, response_serializers):
|
|
self._method_implementations = _flatten_method_pair_map(
|
|
method_implementations)
|
|
self._request_deserializers = _flatten_method_pair_map(
|
|
request_deserializers)
|
|
self._response_serializers = _flatten_method_pair_map(
|
|
response_serializers)
|
|
self._multi_method_implementation = multi_method_implementation
|
|
|
|
def service(self, handler_call_details):
|
|
method_implementation = self._method_implementations.get(
|
|
handler_call_details.method)
|
|
if method_implementation is not None:
|
|
return _simple_method_handler(method_implementation,
|
|
self._request_deserializers.get(
|
|
handler_call_details.method),
|
|
self._response_serializers.get(
|
|
handler_call_details.method))
|
|
elif self._multi_method_implementation is None:
|
|
return None
|
|
else:
|
|
try:
|
|
return None #TODO(nathaniel): call the multimethod.
|
|
except face.NoSuchMethodError:
|
|
return None
|
|
|
|
|
|
class _Server(interfaces.Server):
|
|
|
|
def __init__(self, grpc_server):
|
|
self._grpc_server = grpc_server
|
|
|
|
def add_insecure_port(self, address):
|
|
return self._grpc_server.add_insecure_port(address)
|
|
|
|
def add_secure_port(self, address, server_credentials):
|
|
return self._grpc_server.add_secure_port(address, server_credentials)
|
|
|
|
def start(self):
|
|
self._grpc_server.start()
|
|
|
|
def stop(self, grace):
|
|
return self._grpc_server.stop(grace)
|
|
|
|
def __enter__(self):
|
|
self._grpc_server.start()
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
self._grpc_server.stop(None)
|
|
return False
|
|
|
|
|
|
def server(service_implementations, multi_method_implementation,
|
|
request_deserializers, response_serializers, thread_pool,
|
|
thread_pool_size):
|
|
generic_rpc_handler = _GenericRpcHandler(
|
|
service_implementations, multi_method_implementation,
|
|
request_deserializers, response_serializers)
|
|
if thread_pool is None:
|
|
effective_thread_pool = logging_pool.pool(_DEFAULT_POOL_SIZE
|
|
if thread_pool_size is None
|
|
else thread_pool_size)
|
|
else:
|
|
effective_thread_pool = thread_pool
|
|
return _Server(
|
|
grpc.server(effective_thread_pool, handlers=(generic_rpc_handler,)))
|