346 lines
12 KiB
Python
346 lines
12 KiB
Python
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# Copyright 2015-2016 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Entry points into the Beta API of gRPC Python."""
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# threading is referenced from specification in this module.
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import threading # pylint: disable=unused-import
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# interfaces, cardinality, and face are referenced from specification in this
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# module.
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import grpc
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from grpc import _auth
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from grpc.beta import _client_adaptations
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from grpc.beta import _metadata
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from grpc.beta import _server_adaptations
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from grpc.beta import interfaces # pylint: disable=unused-import
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from grpc.framework.common import cardinality # pylint: disable=unused-import
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from grpc.framework.interfaces.face import face # pylint: disable=unused-import
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# pylint: disable=too-many-arguments
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ChannelCredentials = grpc.ChannelCredentials
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ssl_channel_credentials = grpc.ssl_channel_credentials
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CallCredentials = grpc.CallCredentials
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def metadata_call_credentials(metadata_plugin, name=None):
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def plugin(context, callback):
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def wrapped_callback(beta_metadata, error):
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callback(_metadata.unbeta(beta_metadata), error)
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metadata_plugin(context, wrapped_callback)
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return grpc.metadata_call_credentials(plugin, name=name)
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def google_call_credentials(credentials):
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"""Construct CallCredentials from GoogleCredentials.
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Args:
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credentials: A GoogleCredentials object from the oauth2client library.
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Returns:
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A CallCredentials object for use in a GRPCCallOptions object.
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"""
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return metadata_call_credentials(_auth.GoogleCallCredentials(credentials))
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access_token_call_credentials = grpc.access_token_call_credentials
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composite_call_credentials = grpc.composite_call_credentials
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composite_channel_credentials = grpc.composite_channel_credentials
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class Channel(object):
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"""A channel to a remote host through which RPCs may be conducted.
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Only the "subscribe" and "unsubscribe" methods are supported for application
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use. This class' instance constructor and all other attributes are
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unsupported.
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"""
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def __init__(self, channel):
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self._channel = channel
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def subscribe(self, callback, try_to_connect=None):
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"""Subscribes to this Channel's connectivity.
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Args:
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callback: A callable to be invoked and passed an
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interfaces.ChannelConnectivity identifying this Channel's connectivity.
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The callable will be invoked immediately upon subscription and again for
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every change to this Channel's connectivity thereafter until it is
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unsubscribed.
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try_to_connect: A boolean indicating whether or not this Channel should
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attempt to connect if it is not already connected and ready to conduct
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RPCs.
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"""
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self._channel.subscribe(callback, try_to_connect=try_to_connect)
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def unsubscribe(self, callback):
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"""Unsubscribes a callback from this Channel's connectivity.
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Args:
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callback: A callable previously registered with this Channel from having
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been passed to its "subscribe" method.
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"""
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self._channel.unsubscribe(callback)
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def insecure_channel(host, port):
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"""Creates an insecure Channel to a remote host.
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Args:
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host: The name of the remote host to which to connect.
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port: The port of the remote host to which to connect.
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If None only the 'host' part will be used.
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Returns:
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A Channel to the remote host through which RPCs may be conducted.
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"""
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channel = grpc.insecure_channel(
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host if port is None else "%s:%d" % (host, port)
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)
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return Channel(channel)
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def secure_channel(host, port, channel_credentials):
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"""Creates a secure Channel to a remote host.
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Args:
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host: The name of the remote host to which to connect.
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port: The port of the remote host to which to connect.
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If None only the 'host' part will be used.
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channel_credentials: A ChannelCredentials.
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Returns:
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A secure Channel to the remote host through which RPCs may be conducted.
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"""
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channel = grpc.secure_channel(
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host if port is None else "%s:%d" % (host, port), channel_credentials
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)
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return Channel(channel)
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class StubOptions(object):
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"""A value encapsulating the various options for creation of a Stub.
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This class and its instances have no supported interface - it exists to define
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the type of its instances and its instances exist to be passed to other
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functions.
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"""
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def __init__(
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self,
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host,
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request_serializers,
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response_deserializers,
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metadata_transformer,
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thread_pool,
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thread_pool_size,
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):
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self.host = host
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self.request_serializers = request_serializers
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self.response_deserializers = response_deserializers
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self.metadata_transformer = metadata_transformer
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self.thread_pool = thread_pool
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self.thread_pool_size = thread_pool_size
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_EMPTY_STUB_OPTIONS = StubOptions(None, None, None, None, None, None)
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def stub_options(
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host=None,
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request_serializers=None,
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response_deserializers=None,
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metadata_transformer=None,
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thread_pool=None,
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thread_pool_size=None,
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):
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"""Creates a StubOptions value to be passed at stub creation.
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All parameters are optional and should always be passed by keyword.
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Args:
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host: A host string to set on RPC calls.
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request_serializers: A dictionary from service name-method name pair to
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request serialization behavior.
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response_deserializers: A dictionary from service name-method name pair to
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response deserialization behavior.
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metadata_transformer: A callable that given a metadata object produces
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another metadata object to be used in the underlying communication on the
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wire.
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thread_pool: A thread pool to use in stubs.
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thread_pool_size: The size of thread pool to create for use in stubs;
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ignored if thread_pool has been passed.
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Returns:
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A StubOptions value created from the passed parameters.
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"""
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return StubOptions(
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host,
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request_serializers,
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response_deserializers,
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metadata_transformer,
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thread_pool,
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thread_pool_size,
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)
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def generic_stub(channel, options=None):
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"""Creates a face.GenericStub on which RPCs can be made.
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Args:
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channel: A Channel for use by the created stub.
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options: A StubOptions customizing the created stub.
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Returns:
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A face.GenericStub on which RPCs can be made.
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"""
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effective_options = _EMPTY_STUB_OPTIONS if options is None else options
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return _client_adaptations.generic_stub(
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channel._channel, # pylint: disable=protected-access
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effective_options.host,
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effective_options.metadata_transformer,
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effective_options.request_serializers,
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effective_options.response_deserializers,
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)
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def dynamic_stub(channel, service, cardinalities, options=None):
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"""Creates a face.DynamicStub with which RPCs can be invoked.
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Args:
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channel: A Channel for the returned face.DynamicStub to use.
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service: The package-qualified full name of the service.
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cardinalities: A dictionary from RPC method name to cardinality.Cardinality
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value identifying the cardinality of the RPC method.
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options: An optional StubOptions value further customizing the functionality
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of the returned face.DynamicStub.
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Returns:
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A face.DynamicStub with which RPCs can be invoked.
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"""
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effective_options = _EMPTY_STUB_OPTIONS if options is None else options
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return _client_adaptations.dynamic_stub(
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channel._channel, # pylint: disable=protected-access
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service,
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cardinalities,
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effective_options.host,
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effective_options.metadata_transformer,
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effective_options.request_serializers,
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effective_options.response_deserializers,
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)
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ServerCredentials = grpc.ServerCredentials
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ssl_server_credentials = grpc.ssl_server_credentials
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class ServerOptions(object):
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"""A value encapsulating the various options for creation of a Server.
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This class and its instances have no supported interface - it exists to define
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the type of its instances and its instances exist to be passed to other
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functions.
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"""
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def __init__(
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self,
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multi_method_implementation,
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request_deserializers,
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response_serializers,
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thread_pool,
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thread_pool_size,
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default_timeout,
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maximum_timeout,
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):
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self.multi_method_implementation = multi_method_implementation
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self.request_deserializers = request_deserializers
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self.response_serializers = response_serializers
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self.thread_pool = thread_pool
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self.thread_pool_size = thread_pool_size
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self.default_timeout = default_timeout
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self.maximum_timeout = maximum_timeout
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_EMPTY_SERVER_OPTIONS = ServerOptions(None, None, None, None, None, None, None)
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def server_options(
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multi_method_implementation=None,
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request_deserializers=None,
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response_serializers=None,
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thread_pool=None,
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thread_pool_size=None,
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default_timeout=None,
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maximum_timeout=None,
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):
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"""Creates a ServerOptions value to be passed at server creation.
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All parameters are optional and should always be passed by keyword.
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Args:
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multi_method_implementation: A face.MultiMethodImplementation to be called
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to service an RPC if the server has no specific method implementation for
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the name of the RPC for which service was requested.
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request_deserializers: A dictionary from service name-method name pair to
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request deserialization behavior.
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response_serializers: A dictionary from service name-method name pair to
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response serialization behavior.
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thread_pool: A thread pool to use in stubs.
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thread_pool_size: The size of thread pool to create for use in stubs;
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ignored if thread_pool has been passed.
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default_timeout: A duration in seconds to allow for RPC service when
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servicing RPCs that did not include a timeout value when invoked.
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maximum_timeout: A duration in seconds to allow for RPC service when
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servicing RPCs no matter what timeout value was passed when the RPC was
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invoked.
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Returns:
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A StubOptions value created from the passed parameters.
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"""
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return ServerOptions(
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multi_method_implementation,
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request_deserializers,
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response_serializers,
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thread_pool,
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thread_pool_size,
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default_timeout,
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maximum_timeout,
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)
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def server(service_implementations, options=None):
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"""Creates an interfaces.Server with which RPCs can be serviced.
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Args:
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service_implementations: A dictionary from service name-method name pair to
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face.MethodImplementation.
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options: An optional ServerOptions value further customizing the
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functionality of the returned Server.
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Returns:
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An interfaces.Server with which RPCs can be serviced.
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"""
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effective_options = _EMPTY_SERVER_OPTIONS if options is None else options
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return _server_adaptations.server(
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service_implementations,
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effective_options.multi_method_implementation,
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effective_options.request_deserializers,
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effective_options.response_serializers,
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effective_options.thread_pool,
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effective_options.thread_pool_size,
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)
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