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The base interface of RPC Framework

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This is the public API of the old base package of RPC Framework
extracted into a first-class interface and adapted to metadata, status,
and flow control.
pull/2951/head
Nathaniel Manista 9 years ago
parent 1892b787d8
commit 9df83ab9e2
3 changed files with 382 additions and 0 deletions
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  1. 30
      src/python/grpcio/grpc/framework/interfaces/base/__init__.py
  2. 273
      src/python/grpcio/grpc/framework/interfaces/base/base.py
  3. 79
      src/python/grpcio/grpc/framework/interfaces/base/utilities.py

30
src/python/grpcio/grpc/framework/interfaces/base/__init__.py
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# Copyright 2015, 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.

273
src/python/grpcio/grpc/framework/interfaces/base/base.py
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# Copyright 2015, 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.
"""The base interface of RPC Framework."""
import abc
import enum
# abandonment is referenced from specification in this module.
from grpc.framework.foundation import abandonment # pylint: disable=unused-import
class NoSuchMethodError(Exception):
"""Indicates that an unrecognized operation has been called."""
@enum.unique
class Outcome(enum.Enum):
"""Operation outcomes."""
COMPLETED = 'completed'
CANCELLED = 'cancelled'
EXPIRED = 'expired'
LOCAL_SHUTDOWN = 'local shutdown'
REMOTE_SHUTDOWN = 'remote shutdown'
RECEPTION_FAILURE = 'reception failure'
TRANSMISSION_FAILURE = 'transmission failure'
LOCAL_FAILURE = 'local failure'
REMOTE_FAILURE = 'remote failure'
class Completion(object):
"""An aggregate of the values exchanged upon operation completion.
Attributes:
terminal_metadata: A terminal metadata value for the operaton.
code: A code value for the operation.
message: A message value for the operation.
"""
__metaclass__ = abc.ABCMeta
class OperationContext(object):
"""Provides operation-related information and action."""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def outcome(self):
"""Indicates the operation's outcome (or that the operation is ongoing).
Returns:
None if the operation is still active or the Outcome value for the
operation if it has terminated.
"""
raise NotImplementedError()
@abc.abstractmethod
def add_termination_callback(self, callback):
"""Adds a function to be called upon operation termination.
Args:
callback: A callable to be passed an Outcome value on operation
termination.
Returns:
None if the operation has not yet terminated and the passed callback will
later be called when it does terminate, or if the operation has already
terminated an Outcome value describing the operation termination and the
passed callback will not be called as a result of this method call.
"""
raise NotImplementedError()
@abc.abstractmethod
def time_remaining(self):
"""Describes the length of allowed time remaining for the operation.
Returns:
A nonnegative float indicating the length of allowed time in seconds
remaining for the operation to complete before it is considered to have
timed out. Zero is returned if the operation has terminated.
"""
raise NotImplementedError()
@abc.abstractmethod
def cancel(self):
"""Cancels the operation if the operation has not yet terminated."""
raise NotImplementedError()
@abc.abstractmethod
def fail(self, exception):
"""Indicates that the operation has failed.
Args:
exception: An exception germane to the operation failure. May be None.
"""
raise NotImplementedError()
class Operator(object):
"""An interface through which to participate in an operation."""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def advance(
self, initial_metadata=None, payload=None, completion=None,
allowance=None):
"""Progresses the operation.
Args:
initial_metadata: An initial metadata value. Only one may ever be
communicated in each direction for an operation, and they must be
communicated no later than either the first payload or the completion.
payload: A payload value.
completion: A Completion value. May only ever be non-None once in either
direction, and no payloads may be passed after it has been communicated.
allowance: A positive integer communicating the number of additional
payloads allowed to be passed by the remote side of the operation.
"""
raise NotImplementedError()
class Subscription(object):
"""Describes customer code's interest in values from the other side.
Attributes:
kind: A Kind value describing the overall kind of this value.
termination_callback: A callable to be passed the Outcome associated with
the operation after it has terminated. Must be non-None if kind is
Kind.TERMINATION_ONLY. Must be None otherwise.
allowance: A callable behavior that accepts positive integers representing
the number of additional payloads allowed to be passed to the other side
of the operation. Must be None if kind is Kind.FULL. Must not be None
otherwise.
operator: An Operator to be passed values from the other side of the
operation. Must be non-None if kind is Kind.FULL. Must be None otherwise.
"""
@enum.unique
class Kind(enum.Enum):
NONE = 'none'
TERMINATION_ONLY = 'termination only'
FULL = 'full'
class Servicer(object):
"""Interface for service implementations."""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def service(self, group, method, context, output_operator):
"""Services an operation.
Args:
group: The group identifier of the operation to be serviced.
method: The method identifier of the operation to be serviced.
context: An OperationContext object affording contextual information and
actions.
output_operator: An Operator that will accept output values of the
operation.
Returns:
A Subscription via which this object may or may not accept more values of
the operation.
Raises:
NoSuchMethodError: If this Servicer does not handle operations with the
given group and method.
abandonment.Abandoned: If the operation has been aborted and there no
longer is any reason to service the operation.
"""
raise NotImplementedError()
class End(object):
"""Common type for entry-point objects on both sides of an operation."""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def start(self):
"""Starts this object's service of operations."""
raise NotImplementedError()
@abc.abstractmethod
def stop_gracefully(self):
"""Gracefully stops this object's service of operations.
Operations in progress will be allowed to complete, and this method blocks
until all of them have.
"""
raise NotImplementedError()
@abc.abstractmethod
def stop_immediately(self):
"""Immediately stops this object's service of operations.
Operations in progress will not be allowed to complete.
"""
raise NotImplementedError()
@abc.abstractmethod
def operate(
self, group, method, subscription, timeout, initial_metadata=None,
payload=None, completion=None):
"""Commences an operation.
Args:
group: The group identifier of the invoked operation.
method: The method identifier of the invoked operation.
subscription: A Subscription to which the results of the operation will be
passed.
timeout: A length of time in seconds to allow for the operation.
initial_metadata: An initial metadata value to be sent to the other side
of the operation. May be None if the initial metadata will be later
passed via the returned operator or if there will be no initial metadata
passed at all.
payload: An initial payload for the operation.
completion: A Completion value indicating the end of transmission to the
other side of the operation.
Returns:
A pair of objects affording information about the operation and action
continuing the operation. The first element of the returned pair is an
OperationContext for the operation and the second element of the
returned pair is an Operator to which operation values not passed in
this call should later be passed.
"""
raise NotImplementedError()
@abc.abstractmethod
def operation_stats(self):
"""Reports the number of terminated operations broken down by outcome.
Returns:
A dictionary from Outcome value to an integer identifying the number
of operations that terminated with that outcome.
"""
raise NotImplementedError()
@abc.abstractmethod
def add_idle_action(self, action):
"""Adds an action to be called when this End has no ongoing operations.
Args:
action: A callable that accepts no arguments.
"""
raise NotImplementedError()

79
src/python/grpcio/grpc/framework/interfaces/base/utilities.py
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# Copyright 2015, 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.
"""Utilities for use with the base interface of RPC Framework."""
import collections
from grpc.framework.interfaces.base import base
class _Completion(
base.Completion,
collections.namedtuple(
'_Completion', ('terminal_metadata', 'code', 'message',))):
"""A trivial implementation of base.Completion."""
class _Subscription(
base.Subscription,
collections.namedtuple(
'_Subscription',
('kind', 'termination_callback', 'allowance', 'operator',))):
"""A trivial implementation of base.Subscription."""
_NONE_SUBSCRIPTION = _Subscription(
base.Subscription.Kind.NONE, None, None, None)
def completion(terminal_metadata, code, message):
"""Creates a base.Completion aggregating the given operation values.
Args:
terminal_metadata: A terminal metadata value for an operaton.
code: A code value for an operation.
message: A message value for an operation.
Returns:
A base.Completion aggregating the given operation values.
"""
return _Completion(terminal_metadata, code, message)
def full_subscription(operator):
"""Creates a "full" base.Subscription for the given base.Operator.
Args:
operator: A base.Operator to be used in an operation.
Returns:
A base.Subscription of kind base.Subscription.Kind.FULL wrapping the given
base.Operator.
"""
return _Subscription(base.Subscription.Kind.FULL, None, None, operator)
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