64
104
return "&#%d;" % ord(match.group())
67
_unicode_to_escaped_map = {}
69
def _encode_and_escape(unicode_str, _map=_unicode_to_escaped_map):
107
def _utf8_escape_replace(match, _map=_xml_escape_map):
108
"""Escape utf8 characters into XML safe ones.
110
This uses 2 tricks. It is either escaping "standard" characters, like "&<>,
111
or it is handling characters with the high-bit set. For ascii characters,
112
we just lookup the replacement in the dictionary. For everything else, we
113
decode back into Unicode, and then use the XML escape code.
116
return _map[match.group()]
118
return ''.join('&#%d;' % ord(uni_chr)
119
for uni_chr in match.group().decode('utf8'))
124
def _encode_and_escape(unicode_or_utf8_str, _map=_to_escaped_map):
70
125
"""Encode the string into utf8, and escape invalid XML characters"""
71
126
# We frequently get entities we have not seen before, so it is better
72
127
# to check if None, rather than try/KeyError
73
text = _map.get(unicode_str)
128
text = _map.get(unicode_or_utf8_str)
75
# The alternative policy is to do a regular UTF8 encoding
76
# and then escape only XML meta characters.
77
# Performance is equivalent once you use cache_utf8. *However*
78
# this makes the serialized texts incompatible with old versions
79
# of bzr. So no net gain. (Perhaps the read code would handle utf8
80
# better than entity escapes, but cElementTree seems to do just fine
82
text = str(_utf8_re.sub(_utf8_escape_replace, unicode_str)) + '"'
83
_map[unicode_str] = text
130
if unicode_or_utf8_str.__class__ is unicode:
131
# The alternative policy is to do a regular UTF8 encoding
132
# and then escape only XML meta characters.
133
# Performance is equivalent once you use cache_utf8. *However*
134
# this makes the serialized texts incompatible with old versions
135
# of bzr. So no net gain. (Perhaps the read code would handle utf8
136
# better than entity escapes, but cElementTree seems to do just fine
138
text = str(_unicode_re.sub(_unicode_escape_replace,
139
unicode_or_utf8_str)) + '"'
141
# Plain strings are considered to already be in utf-8 so we do a
142
# slightly different method for escaping.
143
text = _utf8_re.sub(_utf8_escape_replace,
144
unicode_or_utf8_str) + '"'
145
_map[unicode_or_utf8_str] = text
149
def _get_utf8_or_ascii(a_str,
150
_encode_utf8=cache_utf8.encode,
151
_get_cached_ascii=cache_utf8.get_cached_ascii):
152
"""Return a cached version of the string.
154
cElementTree will return a plain string if the XML is plain ascii. It only
155
returns Unicode when it needs to. We want to work in utf-8 strings. So if
156
cElementTree returns a plain string, we can just return the cached version.
157
If it is Unicode, then we need to encode it.
159
:param a_str: An 8-bit string or Unicode as returned by
160
cElementTree.Element.get()
161
:return: A utf-8 encoded 8-bit string.
163
# This is fairly optimized because we know what cElementTree does, this is
164
# not meant as a generic function for all cases. Because it is possible for
165
# an 8-bit string to not be ascii or valid utf8.
166
if a_str.__class__ is unicode:
167
return _encode_utf8(a_str)
87
172
def _clear_cache():
88
173
"""Clean out the unicode => escaped map"""
89
_unicode_to_escaped_map.clear()
92
class Serializer_v5(Serializer):
93
"""Version 5 serializer
95
Packs objects into XML and vice versa.
174
_to_escaped_map.clear()
177
class Serializer_v8(XMLSerializer):
178
"""This serialiser adds rich roots.
180
Its revision format number matches its inventory number.
100
def write_inventory_to_string(self, inv):
101
"""Just call write_inventory with a StringIO and return the value"""
186
support_altered_by_hack = True
187
# This format supports the altered-by hack that reads file ids directly out
188
# of the versionedfile, without doing XML parsing.
190
supported_kinds = set(['file', 'directory', 'symlink'])
192
revision_format_num = None
194
# The search regex used by xml based repositories to determine what things
195
# where changed in a single commit.
196
_file_ids_altered_regex = lazy_regex.lazy_compile(
197
r'file_id="(?P<file_id>[^"]+)"'
198
r'.* revision="(?P<revision_id>[^"]+)"'
201
def _check_revisions(self, inv):
202
"""Extension point for subclasses to check during serialisation.
204
:param inv: An inventory about to be serialised, to be checked.
205
:raises: AssertionError if an error has occurred.
207
if inv.revision_id is None:
208
raise AssertionError("inv.revision_id is None")
209
if inv.root.revision is None:
210
raise AssertionError("inv.root.revision is None")
212
def _check_cache_size(self, inv_size, entry_cache):
213
"""Check that the entry_cache is large enough.
215
We want the cache to be ~2x the size of an inventory. The reason is
216
because we use a FIFO cache, and how Inventory records are likely to
217
change. In general, you have a small number of records which change
218
often, and a lot of records which do not change at all. So when the
219
cache gets full, you actually flush out a lot of the records you are
220
interested in, which means you need to recreate all of those records.
221
An LRU Cache would be better, but the overhead negates the cache
224
One way to look at it, only the size of the cache > len(inv) is your
225
'working' set. And in general, it shouldn't be a problem to hold 2
226
inventories in memory anyway.
228
:param inv_size: The number of entries in an inventory.
230
if entry_cache is None:
232
# 1.5 times might also be reasonable.
233
recommended_min_cache_size = inv_size * 1.5
234
if entry_cache.cache_size() < recommended_min_cache_size:
235
recommended_cache_size = inv_size * 2
236
trace.mutter('Resizing the inventory entry cache from %d to %d',
237
entry_cache.cache_size(), recommended_cache_size)
238
entry_cache.resize(recommended_cache_size)
240
def write_inventory_to_lines(self, inv):
241
"""Return a list of lines with the encoded inventory."""
242
return self.write_inventory(inv, None)
244
def write_inventory_to_string(self, inv, working=False):
245
"""Just call write_inventory with a StringIO and return the value.
247
:param working: If True skip history data - text_sha1, text_size,
248
reference_revision, symlink_target.
102
250
sio = cStringIO.StringIO()
103
self.write_inventory(inv, sio)
251
self.write_inventory(inv, sio, working)
104
252
return sio.getvalue()
106
def write_inventory(self, inv, f):
254
def write_inventory(self, inv, f, working=False):
107
255
"""Write inventory to a file.
109
257
:param inv: the inventory to write.
110
:param f: the file to write.
258
:param f: the file to write. (May be None if the lines are the desired
260
:param working: If True skip history data - text_sha1, text_size,
261
reference_revision, symlink_target.
262
:return: The inventory as a list of lines.
112
264
_ensure_utf8_re()
265
self._check_revisions(inv)
114
267
append = output.append
115
268
self._append_inventory_root(append, inv)
118
271
root_path, root_ie = entries.next()
119
272
for path, ie in entries:
120
self._append_entry(append, ie)
273
if ie.parent_id != self.root_id:
274
parent_str = ' parent_id="'
275
parent_id = _encode_and_escape(ie.parent_id)
279
if ie.kind == 'file':
281
executable = ' executable="yes"'
285
append('<file%s file_id="%s name="%s%s%s revision="%s '
286
'text_sha1="%s" text_size="%d" />\n' % (
287
executable, _encode_and_escape(ie.file_id),
288
_encode_and_escape(ie.name), parent_str, parent_id,
289
_encode_and_escape(ie.revision), ie.text_sha1,
292
append('<file%s file_id="%s name="%s%s%s />\n' % (
293
executable, _encode_and_escape(ie.file_id),
294
_encode_and_escape(ie.name), parent_str, parent_id))
295
elif ie.kind == 'directory':
297
append('<directory file_id="%s name="%s%s%s revision="%s '
299
_encode_and_escape(ie.file_id),
300
_encode_and_escape(ie.name),
301
parent_str, parent_id,
302
_encode_and_escape(ie.revision)))
304
append('<directory file_id="%s name="%s%s%s />\n' % (
305
_encode_and_escape(ie.file_id),
306
_encode_and_escape(ie.name),
307
parent_str, parent_id))
308
elif ie.kind == 'symlink':
310
append('<symlink file_id="%s name="%s%s%s revision="%s '
311
'symlink_target="%s />\n' % (
312
_encode_and_escape(ie.file_id),
313
_encode_and_escape(ie.name),
314
parent_str, parent_id,
315
_encode_and_escape(ie.revision),
316
_encode_and_escape(ie.symlink_target)))
318
append('<symlink file_id="%s name="%s%s%s />\n' % (
319
_encode_and_escape(ie.file_id),
320
_encode_and_escape(ie.name),
321
parent_str, parent_id))
322
elif ie.kind == 'tree-reference':
323
if ie.kind not in self.supported_kinds:
324
raise errors.UnsupportedInventoryKind(ie.kind)
326
append('<tree-reference file_id="%s name="%s%s%s '
327
'revision="%s reference_revision="%s />\n' % (
328
_encode_and_escape(ie.file_id),
329
_encode_and_escape(ie.name),
330
parent_str, parent_id,
331
_encode_and_escape(ie.revision),
332
_encode_and_escape(ie.reference_revision)))
334
append('<tree-reference file_id="%s name="%s%s%s />\n' % (
335
_encode_and_escape(ie.file_id),
336
_encode_and_escape(ie.name),
337
parent_str, parent_id))
339
raise errors.UnsupportedInventoryKind(ie.kind)
121
340
append('</inventory>\n')
123
343
# Just to keep the cache from growing without bounds
124
344
# but we may actually not want to do clear the cache
127
348
def _append_inventory_root(self, append, inv):
128
349
"""Append the inventory root to output."""
130
if inv.root.file_id not in (None, ROOT_ID):
132
append(_encode_and_escape(inv.root.file_id))
133
append(' format="5"')
134
350
if inv.revision_id is not None:
135
append(' revision_id="')
136
append(_encode_and_escape(inv.revision_id))
139
def _append_entry(self, append, ie):
140
"""Convert InventoryEntry to XML element and append to output."""
141
# TODO: should just be a plain assertion
142
assert InventoryEntry.versionable_kind(ie.kind), \
143
'unsupported entry kind %s' % ie.kind
148
append(' executable="yes"')
150
append(_encode_and_escape(ie.file_id))
152
append(_encode_and_escape(ie.name))
153
if ie.parent_id != ROOT_ID:
154
assert isinstance(ie.parent_id, basestring)
155
append(' parent_id="')
156
append(_encode_and_escape(ie.parent_id))
157
if ie.revision is not None:
158
append(' revision="')
159
append(_encode_and_escape(ie.revision))
160
if ie.symlink_target is not None:
161
append(' symlink_target="')
162
append(_encode_and_escape(ie.symlink_target))
163
if ie.text_sha1 is not None:
164
append(' text_sha1="')
167
if ie.text_size is not None:
168
append(' text_size="%d"' % ie.text_size)
351
revid1 = ' revision_id="'
352
revid2 = _encode_and_escape(inv.revision_id)
356
append('<inventory format="%s"%s%s>\n' % (
357
self.format_num, revid1, revid2))
358
append('<directory file_id="%s name="%s revision="%s />\n' % (
359
_encode_and_escape(inv.root.file_id),
360
_encode_and_escape(inv.root.name),
361
_encode_and_escape(inv.root.revision)))
172
363
def _pack_revision(self, rev):
173
364
"""Revision object -> xml tree"""
365
# For the XML format, we need to write them as Unicode rather than as
366
# utf-8 strings. So that cElementTree can handle properly escaping
368
decode_utf8 = cache_utf8.decode
369
revision_id = rev.revision_id
370
if isinstance(revision_id, str):
371
revision_id = decode_utf8(revision_id)
372
format_num = self.format_num
373
if self.revision_format_num is not None:
374
format_num = self.revision_format_num
174
375
root = Element('revision',
175
376
committer = rev.committer,
176
timestamp = '%.9f' % rev.timestamp,
177
revision_id = rev.revision_id,
377
timestamp = '%.3f' % rev.timestamp,
378
revision_id = revision_id,
178
379
inventory_sha1 = rev.inventory_sha1,
181
382
if rev.timezone is not None:
182
383
root.set('timezone', str(rev.timezone))
184
385
msg = SubElement(root, 'message')
185
msg.text = rev.message
386
msg.text = escape_invalid_chars(rev.message)[0]
187
388
if rev.parent_ids:
188
389
pelts = SubElement(root, 'parents')
189
390
pelts.tail = pelts.text = '\n'
190
391
for parent_id in rev.parent_ids:
191
assert isinstance(parent_id, basestring)
392
_mod_revision.check_not_reserved_id(parent_id)
192
393
p = SubElement(pelts, 'revision_ref')
395
if isinstance(parent_id, str):
396
parent_id = decode_utf8(parent_id)
194
397
p.set('revision_id', parent_id)
195
398
if rev.properties:
196
399
self._pack_revision_properties(rev, root)
199
402
def _pack_revision_properties(self, rev, under_element):
200
403
top_elt = SubElement(under_element, 'properties')
201
404
for prop_name, prop_value in sorted(rev.properties.items()):
202
assert isinstance(prop_name, basestring)
203
assert isinstance(prop_value, basestring)
204
405
prop_elt = SubElement(top_elt, 'property')
205
406
prop_elt.set('name', prop_name)
206
407
prop_elt.text = prop_value
207
408
prop_elt.tail = '\n'
208
409
top_elt.tail = '\n'
210
def _unpack_inventory(self, elt):
211
"""Construct from XML Element
213
assert elt.tag == 'inventory'
214
root_id = elt.get('file_id') or ROOT_ID
411
def _unpack_inventory(self, elt, revision_id=None, entry_cache=None,
412
return_from_cache=False):
413
"""Construct from XML Element"""
414
if elt.tag != 'inventory':
415
raise errors.UnexpectedInventoryFormat('Root tag is %r' % elt.tag)
215
416
format = elt.get('format')
216
if format is not None:
218
raise BzrError("invalid format version %r on inventory"
417
if format != self.format_num:
418
raise errors.UnexpectedInventoryFormat('Invalid format version %r'
220
420
revision_id = elt.get('revision_id')
221
421
if revision_id is not None:
222
revision_id = cache_utf8.get_cached_unicode(revision_id)
223
inv = Inventory(root_id, revision_id=revision_id)
422
revision_id = cache_utf8.encode(revision_id)
423
inv = inventory.Inventory(root_id=None, revision_id=revision_id)
225
ie = self._unpack_entry(e)
226
if ie.parent_id == ROOT_ID:
227
ie.parent_id = root_id
425
ie = self._unpack_entry(e, entry_cache=entry_cache,
426
return_from_cache=return_from_cache)
428
self._check_cache_size(len(inv), entry_cache)
231
def _unpack_entry(self, elt):
431
def _unpack_entry(self, elt, entry_cache=None, return_from_cache=False):
433
file_id = elt_get('file_id')
434
revision = elt_get('revision')
435
# Check and see if we have already unpacked this exact entry
436
# Some timings for "repo.revision_trees(last_100_revs)"
438
# unmodified 4.1s 40.8s
440
# using fifo 2.83s 29.1s
444
# no_copy 2.00s 20.5s
445
# no_c,dict 1.95s 18.0s
446
# Note that a cache of 10k nodes is more than sufficient to hold all of
447
# the inventory for the last 100 revs for bzr, but not for mysql (20k
448
# is enough for mysql, which saves the same 2s as using a dict)
450
# Breakdown of mysql using time.clock()
451
# 4.1s 2 calls to element.get for file_id, revision_id
452
# 4.5s cache_hit lookup
453
# 7.1s InventoryFile.copy()
454
# 2.4s InventoryDirectory.copy()
455
# 0.4s decoding unique entries
456
# 1.6s decoding entries after FIFO fills up
457
# 0.8s Adding nodes to FIFO (including flushes)
458
# 0.1s cache miss lookups
460
# 4.1s 2 calls to element.get for file_id, revision_id
461
# 9.9s cache_hit lookup
462
# 10.8s InventoryEntry.copy()
463
# 0.3s cache miss lookus
464
# 1.2s decoding entries
465
# 1.0s adding nodes to LRU
466
if entry_cache is not None and revision is not None:
467
key = (file_id, revision)
469
# We copy it, because some operations may mutate it
470
cached_ie = entry_cache[key]
474
# Only copying directory entries drops us 2.85s => 2.35s
475
if return_from_cache:
476
if cached_ie.kind == 'directory':
477
return cached_ie.copy()
479
return cached_ie.copy()
233
482
if not InventoryEntry.versionable_kind(kind):
234
483
raise AssertionError('unsupported entry kind %s' % kind)
236
get_cached = cache_utf8.get_cached_unicode
485
get_cached = _get_utf8_or_ascii
238
parent_id = elt.get('parent_id')
239
if parent_id == None:
241
# TODO: jam 20060817 At present, caching file ids costs us too
242
# much time. It slows down overall read performances from
243
# approx 500ms to 700ms. And doesn't improve future reads.
244
# it might be because revision ids and file ids are mixing.
245
# Consider caching *just* the file ids, for a limited period
247
#parent_id = get_cached(parent_id)
248
#file_id = get_cached(elt.get('file_id'))
249
file_id = elt.get('file_id')
487
file_id = get_cached(file_id)
488
if revision is not None:
489
revision = get_cached(revision)
490
parent_id = elt_get('parent_id')
491
if parent_id is not None:
492
parent_id = get_cached(parent_id)
251
494
if kind == 'directory':
252
495
ie = inventory.InventoryDirectory(file_id,
255
498
elif kind == 'file':
256
499
ie = inventory.InventoryFile(file_id,
259
ie.text_sha1 = elt.get('text_sha1')
260
if elt.get('executable') == 'yes':
502
ie.text_sha1 = elt_get('text_sha1')
503
if elt_get('executable') == 'yes':
261
504
ie.executable = True
262
v = elt.get('text_size')
505
v = elt_get('text_size')
263
506
ie.text_size = v and int(v)
264
507
elif kind == 'symlink':
265
508
ie = inventory.InventoryLink(file_id,
268
ie.symlink_target = elt.get('symlink_target')
511
ie.symlink_target = elt_get('symlink_target')
270
raise BzrError("unknown kind %r" % kind)
271
revision = elt.get('revision')
272
if revision is not None:
273
revision = get_cached(revision)
513
raise errors.UnsupportedInventoryKind(kind)
274
514
ie.revision = revision
515
if revision is not None and entry_cache is not None:
516
# We cache a copy() because callers like to mutate objects, and
517
# that would cause the item in cache to mutate as well.
518
# This has a small effect on many-inventory performance, because
519
# the majority fraction is spent in cache hits, not misses.
520
entry_cache[key] = ie.copy()
278
524
def _unpack_revision(self, elt):
279
525
"""XML Element -> Revision object"""
280
assert elt.tag == 'revision'
281
526
format = elt.get('format')
527
format_num = self.format_num
528
if self.revision_format_num is not None:
529
format_num = self.revision_format_num
282
530
if format is not None:
284
raise BzrError("invalid format version %r on inventory"
531
if format != format_num:
532
raise BzrError("invalid format version %r on revision"
286
get_cached = cache_utf8.get_cached_unicode
534
get_cached = _get_utf8_or_ascii
287
535
rev = Revision(committer = elt.get('committer'),
288
536
timestamp = float(elt.get('timestamp')),
289
537
revision_id = get_cached(elt.get('revision_id')),
319
565
# properties have string values
320
566
if value is None:
322
assert name not in rev.properties, \
323
"repeated property %r" % name
568
if name in rev.properties:
569
raise AssertionError("repeated property %r" % name)
324
570
rev.properties[name] = value
327
serializer_v5 = Serializer_v5()
572
def _find_text_key_references(self, line_iterator):
573
"""Core routine for extracting references to texts from inventories.
575
This performs the translation of xml lines to revision ids.
577
:param line_iterator: An iterator of lines, origin_version_id
578
:return: A dictionary mapping text keys ((fileid, revision_id) tuples)
579
to whether they were referred to by the inventory of the
580
revision_id that they contain. Note that if that revision_id was
581
not part of the line_iterator's output then False will be given -
582
even though it may actually refer to that key.
584
if not self.support_altered_by_hack:
585
raise AssertionError(
586
"_find_text_key_references only "
587
"supported for branches which store inventory as unnested xml"
588
", not on %r" % self)
591
# this code needs to read every new line in every inventory for the
592
# inventories [revision_ids]. Seeing a line twice is ok. Seeing a line
593
# not present in one of those inventories is unnecessary but not
594
# harmful because we are filtering by the revision id marker in the
595
# inventory lines : we only select file ids altered in one of those
596
# revisions. We don't need to see all lines in the inventory because
597
# only those added in an inventory in rev X can contain a revision=X
599
unescape_revid_cache = {}
600
unescape_fileid_cache = {}
602
# jam 20061218 In a big fetch, this handles hundreds of thousands
603
# of lines, so it has had a lot of inlining and optimizing done.
604
# Sorry that it is a little bit messy.
605
# Move several functions to be local variables, since this is a long
607
search = self._file_ids_altered_regex.search
608
unescape = _unescape_xml
609
setdefault = result.setdefault
610
for line, line_key in line_iterator:
614
# One call to match.group() returning multiple items is quite a
615
# bit faster than 2 calls to match.group() each returning 1
616
file_id, revision_id = match.group('file_id', 'revision_id')
618
# Inlining the cache lookups helps a lot when you make 170,000
619
# lines and 350k ids, versus 8.4 unique ids.
620
# Using a cache helps in 2 ways:
621
# 1) Avoids unnecessary decoding calls
622
# 2) Re-uses cached strings, which helps in future set and
624
# (2) is enough that removing encoding entirely along with
625
# the cache (so we are using plain strings) results in no
626
# performance improvement.
628
revision_id = unescape_revid_cache[revision_id]
630
unescaped = unescape(revision_id)
631
unescape_revid_cache[revision_id] = unescaped
632
revision_id = unescaped
634
# Note that unconditionally unescaping means that we deserialise
635
# every fileid, which for general 'pull' is not great, but we don't
636
# really want to have some many fulltexts that this matters anyway.
639
file_id = unescape_fileid_cache[file_id]
641
unescaped = unescape(file_id)
642
unescape_fileid_cache[file_id] = unescaped
645
key = (file_id, revision_id)
646
setdefault(key, False)
647
if revision_id == line_key[-1]:
652
serializer_v8 = Serializer_v8()