329
278
(len(result.getvalue()), expected_bytes))
332
def set_optimize(self, for_size=None, combine_backing_indices=None):
333
"""Change how the builder tries to optimize the result.
335
:param for_size: Tell the builder to try and make the index as small as
337
:param combine_backing_indices: If the builder spills to disk to save
338
memory, should the on-disk indices be combined. Set to True if you
339
are going to be probing the index, but to False if you are not. (If
340
you are not querying, then the time spent combining is wasted.)
343
# GraphIndexBuilder itself doesn't pay attention to the flag yet, but
345
if for_size is not None:
346
self._optimize_for_size = for_size
347
if combine_backing_indices is not None:
348
self._combine_backing_indices = combine_backing_indices
350
def find_ancestry(self, keys, ref_list_num):
351
"""See CombinedGraphIndex.find_ancestry()"""
357
for _, key, value, ref_lists in self.iter_entries(pending):
358
parent_keys = ref_lists[ref_list_num]
359
parent_map[key] = parent_keys
360
next_pending.update([p for p in parent_keys if p not in
362
missing_keys.update(pending.difference(parent_map))
363
pending = next_pending
364
return parent_map, missing_keys
367
282
class GraphIndex(object):
368
283
"""An index for data with embedded graphs.
370
285
The index maps keys to a list of key reference lists, and a value.
371
286
Each node has the same number of key reference lists. Each key reference
372
287
list can be empty or an arbitrary length. The value is an opaque NULL
373
terminated string without any newlines. The storage of the index is
288
terminated string without any newlines. The storage of the index is
374
289
hidden in the interface: keys and key references are always tuples of
375
290
bytestrings, never the internal representation (e.g. dictionary offsets).
475
382
node_value = value
476
383
self._nodes[key] = node_value
384
if self._key_length > 1:
385
# TODO: We may want to do this lazily, but if we are calling
386
# _buffer_all, we are likely to be doing
387
# iter_entries_prefix
388
key_dict = self._nodes_by_key
389
if self.node_ref_lists:
390
key_value = key, node_value[0], node_value[1]
392
key_value = key, node_value
393
# For a key of (foo, bar, baz) create
394
# _nodes_by_key[foo][bar][baz] = key_value
395
for subkey in key[:-1]:
396
key_dict = key_dict.setdefault(subkey, {})
397
key_dict[key[-1]] = key_value
477
398
# cache the keys for quick set intersections
399
self._keys = set(self._nodes)
478
400
if trailers != 1:
479
401
# there must be one line - the empty trailer line.
480
402
raise errors.BadIndexData(self)
482
def clear_cache(self):
483
"""Clear out any cached/memoized values.
485
This can be called at any time, but generally it is used when we have
486
extracted some information, but don't expect to be requesting any more
490
def external_references(self, ref_list_num):
491
"""Return references that are not present in this index.
494
if ref_list_num + 1 > self.node_ref_lists:
495
raise ValueError('No ref list %d, index has %d ref lists'
496
% (ref_list_num, self.node_ref_lists))
499
for key, (value, ref_lists) in nodes.iteritems():
500
ref_list = ref_lists[ref_list_num]
501
refs.update([ref for ref in ref_list if ref not in nodes])
504
def _get_nodes_by_key(self):
505
if self._nodes_by_key is None:
507
if self.node_ref_lists:
508
for key, (value, references) in self._nodes.iteritems():
509
key_dict = nodes_by_key
510
for subkey in key[:-1]:
511
key_dict = key_dict.setdefault(subkey, {})
512
key_dict[key[-1]] = key, value, references
514
for key, value in self._nodes.iteritems():
515
key_dict = nodes_by_key
516
for subkey in key[:-1]:
517
key_dict = key_dict.setdefault(subkey, {})
518
key_dict[key[-1]] = key, value
519
self._nodes_by_key = nodes_by_key
520
return self._nodes_by_key
522
404
def iter_all_entries(self):
523
405
"""Iterate over all keys within the index.
1241
1091
class CombinedGraphIndex(object):
1242
1092
"""A GraphIndex made up from smaller GraphIndices.
1244
1094
The backing indices must implement GraphIndex, and are presumed to be
1247
1097
Queries against the combined index will be made against the first index,
1248
and then the second and so on. The order of indices can thus influence
1098
and then the second and so on. The order of index's can thus influence
1249
1099
performance significantly. For example, if one index is on local disk and a
1250
1100
second on a remote server, the local disk index should be before the other
1251
1101
in the index list.
1253
Also, queries tend to need results from the same indices as previous
1254
queries. So the indices will be reordered after every query to put the
1255
indices that had the result(s) of that query first (while otherwise
1256
preserving the relative ordering).
1259
def __init__(self, indices, reload_func=None):
1104
def __init__(self, indices):
1260
1105
"""Create a CombinedGraphIndex backed by indices.
1262
1107
:param indices: An ordered list of indices to query for data.
1263
:param reload_func: A function to call if we find we are missing an
1264
index. Should have the form reload_func() => True/False to indicate
1265
if reloading actually changed anything.
1267
1109
self._indices = indices
1268
self._reload_func = reload_func
1269
# Sibling indices are other CombinedGraphIndex that we should call
1270
# _move_to_front_by_name on when we auto-reorder ourself.
1271
self._sibling_indices = []
1272
# A list of names that corresponds to the instances in self._indices,
1273
# so _index_names[0] is always the name for _indices[0], etc. Sibling
1274
# indices must all use the same set of names as each other.
1275
self._index_names = [None] * len(self._indices)
1277
1111
def __repr__(self):
1278
1112
return "%s(%s)" % (
1279
1113
self.__class__.__name__,
1280
1114
', '.join(map(repr, self._indices)))
1282
def clear_cache(self):
1283
"""See GraphIndex.clear_cache()"""
1284
for index in self._indices:
1116
@symbol_versioning.deprecated_method(symbol_versioning.one_one)
1117
def get_parents(self, revision_ids):
1118
"""See graph._StackedParentsProvider.get_parents.
1120
This implementation thunks the graph.Graph.get_parents api across to
1123
:param revision_ids: An iterable of graph keys for this graph.
1124
:return: A list of parent details for each key in revision_ids.
1125
Each parent details will be one of:
1126
* None when the key was missing
1127
* (NULL_REVISION,) when the key has no parents.
1128
* (parent_key, parent_key...) otherwise.
1130
parent_map = self.get_parent_map(revision_ids)
1131
return [parent_map.get(r, None) for r in revision_ids]
1287
1133
def get_parent_map(self, keys):
1288
"""See graph.StackedParentsProvider.get_parent_map"""
1134
"""See graph._StackedParentsProvider.get_parent_map"""
1289
1135
search_keys = set(keys)
1290
1136
if NULL_REVISION in search_keys:
1291
1137
search_keys.discard(NULL_REVISION)
1391
1215
seen_keys = set()
1395
for index in self._indices:
1397
for node in index.iter_entries_prefix(keys):
1398
if node[1] in seen_keys:
1400
seen_keys.add(node[1])
1404
hit_indices.append(index)
1406
except errors.NoSuchFile:
1407
self._reload_or_raise()
1408
self._move_to_front(hit_indices)
1410
def _move_to_front(self, hit_indices):
1411
"""Rearrange self._indices so that hit_indices are first.
1413
Order is maintained as much as possible, e.g. the first unhit index
1414
will be the first index in _indices after the hit_indices, and the
1415
hit_indices will be present in exactly the order they are passed to
1418
_move_to_front propagates to all objects in self._sibling_indices by
1419
calling _move_to_front_by_name.
1421
hit_names = self._move_to_front_by_index(hit_indices)
1422
for sibling_idx in self._sibling_indices:
1423
sibling_idx._move_to_front_by_name(hit_names)
1425
def _move_to_front_by_index(self, hit_indices):
1426
"""Core logic for _move_to_front.
1428
Returns a list of names corresponding to the hit_indices param.
1430
indices_info = zip(self._index_names, self._indices)
1431
if 'index' in debug.debug_flags:
1432
mutter('CombinedGraphIndex reordering: currently %r, promoting %r',
1433
indices_info, hit_indices)
1434
hit_indices_info = []
1436
unhit_indices_info = []
1437
for name, idx in indices_info:
1438
if idx in hit_indices:
1439
info = hit_indices_info
1440
hit_names.append(name)
1442
info = unhit_indices_info
1443
info.append((name, idx))
1444
final_info = hit_indices_info + unhit_indices_info
1445
self._indices = [idx for (name, idx) in final_info]
1446
self._index_names = [name for (name, idx) in final_info]
1447
if 'index' in debug.debug_flags:
1448
mutter('CombinedGraphIndex reordered: %r', self._indices)
1451
def _move_to_front_by_name(self, hit_names):
1452
"""Moves indices named by 'hit_names' to front of the search order, as
1453
described in _move_to_front.
1455
# Translate names to index instances, and then call
1456
# _move_to_front_by_index.
1457
indices_info = zip(self._index_names, self._indices)
1459
for name, idx in indices_info:
1460
if name in hit_names:
1461
hit_indices.append(idx)
1462
self._move_to_front_by_index(hit_indices)
1464
def find_ancestry(self, keys, ref_list_num):
1465
"""Find the complete ancestry for the given set of keys.
1467
Note that this is a whole-ancestry request, so it should be used
1470
:param keys: An iterable of keys to look for
1471
:param ref_list_num: The reference list which references the parents
1473
:return: (parent_map, missing_keys)
1475
# XXX: make this call _move_to_front?
1476
missing_keys = set()
1478
keys_to_lookup = set(keys)
1480
while keys_to_lookup:
1481
# keys that *all* indexes claim are missing, stop searching them
1483
all_index_missing = None
1484
# print 'gen\tidx\tsub\tn_keys\tn_pmap\tn_miss'
1485
# print '%4d\t\t\t%4d\t%5d\t%5d' % (generation, len(keys_to_lookup),
1487
# len(missing_keys))
1488
for index_idx, index in enumerate(self._indices):
1489
# TODO: we should probably be doing something with
1490
# 'missing_keys' since we've already determined that
1491
# those revisions have not been found anywhere
1492
index_missing_keys = set()
1493
# Find all of the ancestry we can from this index
1494
# keep looking until the search_keys set is empty, which means
1495
# things we didn't find should be in index_missing_keys
1496
search_keys = keys_to_lookup
1498
# print ' \t%2d\t\t%4d\t%5d\t%5d' % (
1499
# index_idx, len(search_keys),
1500
# len(parent_map), len(index_missing_keys))
1503
# TODO: ref_list_num should really be a parameter, since
1504
# CombinedGraphIndex does not know what the ref lists
1506
search_keys = index._find_ancestors(search_keys,
1507
ref_list_num, parent_map, index_missing_keys)
1508
# print ' \t \t%2d\t%4d\t%5d\t%5d' % (
1509
# sub_generation, len(search_keys),
1510
# len(parent_map), len(index_missing_keys))
1511
# Now set whatever was missing to be searched in the next index
1512
keys_to_lookup = index_missing_keys
1513
if all_index_missing is None:
1514
all_index_missing = set(index_missing_keys)
1516
all_index_missing.intersection_update(index_missing_keys)
1517
if not keys_to_lookup:
1519
if all_index_missing is None:
1520
# There were no indexes, so all search keys are 'missing'
1521
missing_keys.update(keys_to_lookup)
1522
keys_to_lookup = None
1524
missing_keys.update(all_index_missing)
1525
keys_to_lookup.difference_update(all_index_missing)
1526
return parent_map, missing_keys
1216
for index in self._indices:
1217
for node in index.iter_entries_prefix(keys):
1218
if node[1] in seen_keys:
1220
seen_keys.add(node[1])
1528
1223
def key_count(self):
1529
1224
"""Return an estimate of the number of keys in this index.
1531
1226
For CombinedGraphIndex this is approximated by the sum of the keys of
1532
1227
the child indices. As child indices may have duplicate keys this can
1533
1228
have a maximum error of the number of child indices * largest number of
1534
1229
keys in any index.
1538
return sum((index.key_count() for index in self._indices), 0)
1539
except errors.NoSuchFile:
1540
self._reload_or_raise()
1542
missing_keys = _missing_keys_from_parent_map
1544
def _reload_or_raise(self):
1545
"""We just got a NoSuchFile exception.
1547
Try to reload the indices, if it fails, just raise the current
1550
if self._reload_func is None:
1552
exc_type, exc_value, exc_traceback = sys.exc_info()
1553
trace.mutter('Trying to reload after getting exception: %s',
1555
if not self._reload_func():
1556
# We tried to reload, but nothing changed, so we fail anyway
1557
trace.mutter('_reload_func indicated nothing has changed.'
1558
' Raising original exception.')
1559
raise exc_type, exc_value, exc_traceback
1561
def set_sibling_indices(self, sibling_combined_graph_indices):
1562
"""Set the CombinedGraphIndex objects to reorder after reordering self.
1564
self._sibling_indices = sibling_combined_graph_indices
1231
return sum((index.key_count() for index in self._indices), 0)
1566
1233
def validate(self):
1567
1234
"""Validate that everything in the index can be accessed."""
1570
for index in self._indices:
1573
except errors.NoSuchFile:
1574
self._reload_or_raise()
1235
for index in self._indices:
1577
1239
class InMemoryGraphIndex(GraphIndexBuilder):