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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.
"""State used by both invocation-side and service-side code."""
import enum
@enum.unique
class HighWrite(enum.Enum):
"""The possible categories of high-level write state."""
OPEN = 'OPEN'
CLOSED = 'CLOSED'
class WriteState(object):
"""A description of the state of writing to an RPC.
Attributes:
low: A side-specific value describing the low-level state of writing.
high: A HighWrite value describing the high-level state of writing.
pending: A list of bytestrings for the RPC waiting to be written to the
other side of the RPC.
"""
def __init__(self, low, high, pending):
self.low = low
self.high = high
self.pending = pending
class CommonRPCState(object):
"""A description of an RPC's state.
Attributes:
write: A WriteState describing the state of writing to the RPC.
sequence_number: The lowest-unused sequence number for use in generating
tickets locally describing the progress of the RPC.
deserializer: The behavior to be used to deserialize payload bytestreams
taken off the wire.
serializer: The behavior to be used to serialize payloads to be sent on the
wire.
"""
def __init__(self, write, sequence_number, deserializer, serializer):
self.write = write
self.sequence_number = sequence_number
self.deserializer = deserializer
self.serializer = serializer
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