119
120
:param num_bytes: Ensure that we have extracted at least num_bytes of
120
121
content. If None, consume everything
122
# TODO: If we re-use the same content block at different times during
123
# get_record_stream(), it is possible that the first pass will
124
# get inserted, triggering an extract/_ensure_content() which
125
# will get rid of _z_content. And then the next use of the block
126
# will try to access _z_content (to send it over the wire), and
127
# fail because it is already extracted. Consider never releasing
128
# _z_content because of this.
123
if self._content_length is None:
124
raise AssertionError('self._content_length should never be None')
129
125
if num_bytes is None:
130
126
num_bytes = self._content_length
131
127
elif (self._content_length is not None
148
144
self._content = pylzma.decompress(self._z_content)
149
145
elif self._compressor_name == 'zlib':
150
146
# Start a zlib decompressor
151
if num_bytes is None:
147
if num_bytes * 4 > self._content_length * 3:
148
# If we are requesting more that 3/4ths of the content,
149
# just extract the whole thing in a single pass
150
num_bytes = self._content_length
152
151
self._content = zlib.decompress(self._z_content)
154
153
self._z_content_decompressor = zlib.decompressobj()
163
164
# 'unconsumed_tail'
165
166
# Do we have enough bytes already?
166
if num_bytes is not None and len(self._content) >= num_bytes:
168
if num_bytes is None and self._z_content_decompressor is None:
169
# We must have already decompressed everything
167
if len(self._content) >= num_bytes:
171
169
# If we got this far, and don't have a decompressor, something is wrong
172
170
if self._z_content_decompressor is None:
173
171
raise AssertionError(
174
172
'No decompressor to decompress %d bytes' % num_bytes)
175
173
remaining_decomp = self._z_content_decompressor.unconsumed_tail
176
if num_bytes is None:
178
# We don't know how much is left, but we'll decompress it all
179
self._content += self._z_content_decompressor.decompress(
181
# Note: There's what I consider a bug in zlib.decompressobj
182
# If you pass back in the entire unconsumed_tail, only
183
# this time you don't pass a max-size, it doesn't
184
# change the unconsumed_tail back to None/''.
185
# However, we know we are done with the whole stream
186
self._z_content_decompressor = None
187
# XXX: Why is this the only place in this routine we set this?
188
self._content_length = len(self._content)
190
if not remaining_decomp:
191
raise AssertionError('Nothing left to decompress')
192
needed_bytes = num_bytes - len(self._content)
193
# We always set max_size to 32kB over the minimum needed, so that
194
# zlib will give us as much as we really want.
195
# TODO: If this isn't good enough, we could make a loop here,
196
# that keeps expanding the request until we get enough
197
self._content += self._z_content_decompressor.decompress(
198
remaining_decomp, needed_bytes + _ZLIB_DECOMP_WINDOW)
199
if len(self._content) < num_bytes:
200
raise AssertionError('%d bytes wanted, only %d available'
201
% (num_bytes, len(self._content)))
202
if not self._z_content_decompressor.unconsumed_tail:
203
# The stream is finished
204
self._z_content_decompressor = None
174
if not remaining_decomp:
175
raise AssertionError('Nothing left to decompress')
176
needed_bytes = num_bytes - len(self._content)
177
# We always set max_size to 32kB over the minimum needed, so that
178
# zlib will give us as much as we really want.
179
# TODO: If this isn't good enough, we could make a loop here,
180
# that keeps expanding the request until we get enough
181
self._content += self._z_content_decompressor.decompress(
182
remaining_decomp, needed_bytes + _ZLIB_DECOMP_WINDOW)
183
if len(self._content) < num_bytes:
184
raise AssertionError('%d bytes wanted, only %d available'
185
% (num_bytes, len(self._content)))
186
if not self._z_content_decompressor.unconsumed_tail:
187
# The stream is finished
188
self._z_content_decompressor = None
206
190
def _parse_bytes(self, bytes, pos):
207
191
"""Read the various lengths from the header.
1283
1267
return self.get_record_stream(keys, 'unordered', True)
1269
def clear_cache(self):
1270
"""See VersionedFiles.clear_cache()"""
1271
self._group_cache.clear()
1272
self._index._graph_index.clear_cache()
1273
self._index._int_cache.clear()
1285
1275
def _check_add(self, key, lines, random_id, check_content):
1286
1276
"""check that version_id and lines are safe to add."""
1287
1277
version_id = key[-1]
1757
1747
key = record.key
1758
1748
self._unadded_refs[key] = record.parents
1759
1749
yield found_sha1
1760
keys_to_add.append((key, '%d %d' % (start_point, end_point),
1750
as_st = static_tuple.StaticTuple.from_sequence
1751
if record.parents is not None:
1752
parents = as_st([as_st(p) for p in record.parents])
1755
refs = static_tuple.StaticTuple(parents)
1756
keys_to_add.append((key, '%d %d' % (start_point, end_point), refs))
1762
1757
if len(keys_to_add):
1764
1759
self._compressor = None
1885
1883
if not random_id:
1886
1884
present_nodes = self._get_entries(keys)
1887
1885
for (index, key, value, node_refs) in present_nodes:
1888
if node_refs != keys[key][1]:
1889
details = '%s %s %s' % (key, (value, node_refs), keys[key])
1886
# Sometimes these are passed as a list rather than a tuple
1887
node_refs = static_tuple.as_tuples(node_refs)
1888
passed = static_tuple.as_tuples(keys[key])
1889
if node_refs != passed[1]:
1890
details = '%s %s %s' % (key, (value, node_refs), passed)
1890
1891
if self._inconsistency_fatal:
1891
1892
raise errors.KnitCorrupt(self, "inconsistent details"
1892
1893
" in add_records: %s" %
2025
2026
"""Convert an index value to position details."""
2026
2027
bits = node[2].split(' ')
2027
2028
# It would be nice not to read the entire gzip.
2029
# start and stop are put into _int_cache because they are very common.
2030
# They define the 'group' that an entry is in, and many groups can have
2031
# thousands of objects.
2032
# Branching Launchpad, for example, saves ~600k integers, at 12 bytes
2033
# each, or about 7MB. Note that it might be even more when you consider
2034
# how PyInt is allocated in separate slabs. And you can't return a slab
2035
# to the OS if even 1 int on it is in use. Note though that Python uses
2036
# a LIFO when re-using PyInt slots, which probably causes more
2028
2038
start = int(bits[0])
2039
start = self._int_cache.setdefault(start, start)
2029
2040
stop = int(bits[1])
2041
stop = self._int_cache.setdefault(stop, stop)
2030
2042
basis_end = int(bits[2])
2031
2043
delta_end = int(bits[3])
2032
return node[0], start, stop, basis_end, delta_end
2044
# We can't use StaticTuple here, because node[0] is a BTreeGraphIndex
2046
return (node[0], start, stop, basis_end, delta_end)
2034
2048
def scan_unvalidated_index(self, graph_index):
2035
2049
"""Inform this _GCGraphIndex that there is an unvalidated index.
added
removed
bzrlib/groupcompress.py
