committablefilectx: propagate ancestry info to parent to fix annotation
Before this patch, annotating working directory could include wrong revisions
that were hidden or belonged to different branches. This fixes wfctx.parents()
to set _descendantrev so that all ancestors can take advantage of the linkrev
adjustment introduced at
c48924787eaa. _adjustlinkrev() can handle 'None'
revision thanks to
5a12ef618c03.
# Copyright 2011, 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.
"""Reader objects to abstract out different body response types.
This module is package-private. It is not expected that these will
have any clients outside of httpplus.
"""
import httplib
import logging
logger = logging.getLogger(__name__)
class ReadNotReady(Exception):
"""Raised when read() is attempted but not enough data is loaded."""
class HTTPRemoteClosedError(httplib.HTTPException):
"""The server closed the remote socket in the middle of a response."""
class AbstractReader(object):
"""Abstract base class for response readers.
Subclasses must implement _load, and should implement _close if
it's not an error for the server to close their socket without
some termination condition being detected during _load.
"""
def __init__(self):
self._finished = False
self._done_chunks = []
self.available_data = 0
def _addchunk(self, data):
self._done_chunks.append(data)
self.available_data += len(data)
def _pushchunk(self, data):
self._done_chunks.insert(0, data)
self.available_data += len(data)
def _popchunk(self):
b = self._done_chunks.pop(0)
self.available_data -= len(b)
return b
def done(self):
"""Returns true if the response body is entirely read."""
return self._finished
def read(self, amt):
"""Read amt bytes from the response body."""
if self.available_data < amt and not self._finished:
raise ReadNotReady()
blocks = []
need = amt
while self._done_chunks:
b = self._popchunk()
if len(b) > need:
nb = b[:need]
self._pushchunk(b[need:])
b = nb
blocks.append(b)
need -= len(b)
if need == 0:
break
result = ''.join(blocks)
assert len(result) == amt or (self._finished and len(result) < amt)
return result
def readto(self, delimstr, blocks = None):
"""return available data chunks up to the first one in which delimstr
occurs. No data will be returned after delimstr -- the chunk in which
it occurs will be split and the remainder pushed back onto the available
data queue. If blocks is supplied chunks will be added to blocks, otherwise
a new list will be allocated.
"""
if blocks is None:
blocks = []
while self._done_chunks:
b = self._popchunk()
i = b.find(delimstr) + len(delimstr)
if i:
if i < len(b):
self._pushchunk(b[i:])
blocks.append(b[:i])
break
else:
blocks.append(b)
return blocks
def _load(self, data): # pragma: no cover
"""Subclasses must implement this.
As data is available to be read out of this object, it should
be placed into the _done_chunks list. Subclasses should not
rely on data remaining in _done_chunks forever, as it may be
reaped if the client is parsing data as it comes in.
"""
raise NotImplementedError
def _close(self):
"""Default implementation of close.
The default implementation assumes that the reader will mark
the response as finished on the _finished attribute once the
entire response body has been read. In the event that this is
not true, the subclass should override the implementation of
close (for example, close-is-end responses have to set
self._finished in the close handler.)
"""
if not self._finished:
raise HTTPRemoteClosedError(
'server appears to have closed the socket mid-response')
class AbstractSimpleReader(AbstractReader):
"""Abstract base class for simple readers that require no response decoding.
Examples of such responses are Connection: Close (close-is-end)
and responses that specify a content length.
"""
def _load(self, data):
if data:
assert not self._finished, (
'tried to add data (%r) to a closed reader!' % data)
logger.debug('%s read an additional %d data',
self.name, len(data)) # pylint: disable=E1101
self._addchunk(data)
class CloseIsEndReader(AbstractSimpleReader):
"""Reader for responses that specify Connection: Close for length."""
name = 'close-is-end'
def _close(self):
logger.info('Marking close-is-end reader as closed.')
self._finished = True
class ContentLengthReader(AbstractSimpleReader):
"""Reader for responses that specify an exact content length."""
name = 'content-length'
def __init__(self, amount):
AbstractSimpleReader.__init__(self)
self._amount = amount
if amount == 0:
self._finished = True
self._amount_seen = 0
def _load(self, data):
AbstractSimpleReader._load(self, data)
self._amount_seen += len(data)
if self._amount_seen >= self._amount:
self._finished = True
logger.debug('content-length read complete')
class ChunkedReader(AbstractReader):
"""Reader for chunked transfer encoding responses."""
def __init__(self, eol):
AbstractReader.__init__(self)
self._eol = eol
self._leftover_skip_amt = 0
self._leftover_data = ''
def _load(self, data):
assert not self._finished, 'tried to add data to a closed reader!'
logger.debug('chunked read an additional %d data', len(data))
position = 0
if self._leftover_data:
logger.debug(
'chunked reader trying to finish block from leftover data')
# TODO: avoid this string concatenation if possible
data = self._leftover_data + data
position = self._leftover_skip_amt
self._leftover_data = ''
self._leftover_skip_amt = 0
datalen = len(data)
while position < datalen:
split = data.find(self._eol, position)
if split == -1:
self._leftover_data = data
self._leftover_skip_amt = position
return
amt = int(data[position:split], base=16)
block_start = split + len(self._eol)
# If the whole data chunk plus the eol trailer hasn't
# loaded, we'll wait for the next load.
if block_start + amt + len(self._eol) > len(data):
self._leftover_data = data
self._leftover_skip_amt = position
return
if amt == 0:
self._finished = True
logger.debug('closing chunked reader due to chunk of length 0')
return
self._addchunk(data[block_start:block_start + amt])
position = block_start + amt + len(self._eol)
# no-check-code