root / pithos / backends / lib / sqlite / node.py @ 7759260d
History | View | Annotate | Download (27.6 kB)
1 |
# Copyright 2011 GRNET S.A. All rights reserved.
|
---|---|
2 |
#
|
3 |
# Redistribution and use in source and binary forms, with or
|
4 |
# without modification, are permitted provided that the following
|
5 |
# conditions are met:
|
6 |
#
|
7 |
# 1. Redistributions of source code must retain the above
|
8 |
# copyright notice, this list of conditions and the following
|
9 |
# disclaimer.
|
10 |
#
|
11 |
# 2. Redistributions in binary form must reproduce the above
|
12 |
# copyright notice, this list of conditions and the following
|
13 |
# disclaimer in the documentation and/or other materials
|
14 |
# provided with the distribution.
|
15 |
#
|
16 |
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
17 |
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
18 |
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
19 |
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
20 |
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
21 |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
22 |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
23 |
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
24 |
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
26 |
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
27 |
# POSSIBILITY OF SUCH DAMAGE.
|
28 |
#
|
29 |
# The views and conclusions contained in the software and
|
30 |
# documentation are those of the authors and should not be
|
31 |
# interpreted as representing official policies, either expressed
|
32 |
# or implied, of GRNET S.A.
|
33 |
|
34 |
from time import time |
35 |
|
36 |
from dbworker import DBWorker |
37 |
|
38 |
|
39 |
ROOTNODE = 0
|
40 |
|
41 |
( SERIAL, NODE, HASH, SIZE, SOURCE, MTIME, MUSER, CLUSTER ) = range(8) |
42 |
|
43 |
inf = float('inf') |
44 |
|
45 |
|
46 |
def strnextling(prefix): |
47 |
"""Return the first unicode string
|
48 |
greater than but not starting with given prefix.
|
49 |
strnextling('hello') -> 'hellp'
|
50 |
"""
|
51 |
if not prefix: |
52 |
## all strings start with the null string,
|
53 |
## therefore we have to approximate strnextling('')
|
54 |
## with the last unicode character supported by python
|
55 |
## 0x10ffff for wide (32-bit unicode) python builds
|
56 |
## 0x00ffff for narrow (16-bit unicode) python builds
|
57 |
## We will not autodetect. 0xffff is safe enough.
|
58 |
return unichr(0xffff) |
59 |
s = prefix[:-1]
|
60 |
c = ord(prefix[-1]) |
61 |
if c >= 0xffff: |
62 |
raise RuntimeError |
63 |
s += unichr(c+1) |
64 |
return s
|
65 |
|
66 |
def strprevling(prefix): |
67 |
"""Return an approximation of the last unicode string
|
68 |
less than but not starting with given prefix.
|
69 |
strprevling(u'hello') -> u'helln\\xffff'
|
70 |
"""
|
71 |
if not prefix: |
72 |
## There is no prevling for the null string
|
73 |
return prefix
|
74 |
s = prefix[:-1]
|
75 |
c = ord(prefix[-1]) |
76 |
if c > 0: |
77 |
s += unichr(c-1) + unichr(0xffff) |
78 |
return s
|
79 |
|
80 |
|
81 |
_propnames = { |
82 |
'serial' : 0, |
83 |
'node' : 1, |
84 |
'hash' : 2, |
85 |
'size' : 3, |
86 |
'source' : 4, |
87 |
'mtime' : 5, |
88 |
'muser' : 6, |
89 |
'cluster' : 7, |
90 |
} |
91 |
|
92 |
|
93 |
class Node(DBWorker): |
94 |
"""Nodes store path organization and have multiple versions.
|
95 |
Versions store object history and have multiple attributes.
|
96 |
Attributes store metadata.
|
97 |
"""
|
98 |
|
99 |
# TODO: Provide an interface for included and excluded clusters.
|
100 |
|
101 |
def __init__(self, **params): |
102 |
DBWorker.__init__(self, **params)
|
103 |
execute = self.execute
|
104 |
|
105 |
execute(""" pragma foreign_keys = on """)
|
106 |
|
107 |
execute(""" create table if not exists nodes
|
108 |
( node integer primary key,
|
109 |
parent integer default 0,
|
110 |
path text not null default '',
|
111 |
foreign key (parent)
|
112 |
references nodes(node)
|
113 |
on update cascade
|
114 |
on delete cascade ) """)
|
115 |
execute(""" create unique index if not exists idx_nodes_path
|
116 |
on nodes(path) """)
|
117 |
|
118 |
execute(""" create table if not exists policy
|
119 |
( node integer,
|
120 |
key text,
|
121 |
value text,
|
122 |
primary key (node, key)
|
123 |
foreign key (node)
|
124 |
references nodes(node)
|
125 |
on update cascade
|
126 |
on delete cascade ) """)
|
127 |
|
128 |
execute(""" create table if not exists statistics
|
129 |
( node integer,
|
130 |
population integer not null default 0,
|
131 |
size integer not null default 0,
|
132 |
mtime integer,
|
133 |
cluster integer not null default 0,
|
134 |
primary key (node, cluster)
|
135 |
foreign key (node)
|
136 |
references nodes(node)
|
137 |
on update cascade
|
138 |
on delete cascade ) """)
|
139 |
|
140 |
execute(""" create table if not exists versions
|
141 |
( serial integer primary key,
|
142 |
node integer,
|
143 |
hash text,
|
144 |
size integer not null default 0,
|
145 |
source integer,
|
146 |
mtime integer,
|
147 |
muser text not null default '',
|
148 |
cluster integer not null default 0,
|
149 |
foreign key (node)
|
150 |
references nodes(node)
|
151 |
on update cascade
|
152 |
on delete cascade ) """)
|
153 |
execute(""" create index if not exists idx_versions_node_mtime
|
154 |
on versions(node, mtime) """)
|
155 |
|
156 |
execute(""" create table if not exists attributes
|
157 |
( serial integer,
|
158 |
key text,
|
159 |
value text,
|
160 |
primary key (serial, key)
|
161 |
foreign key (serial)
|
162 |
references versions(serial)
|
163 |
on update cascade
|
164 |
on delete cascade ) """)
|
165 |
|
166 |
q = "insert or ignore into nodes(node, parent) values (?, ?)"
|
167 |
execute(q, (ROOTNODE, ROOTNODE)) |
168 |
|
169 |
def node_create(self, parent, path): |
170 |
"""Create a new node from the given properties.
|
171 |
Return the node identifier of the new node.
|
172 |
"""
|
173 |
|
174 |
q = ("insert into nodes (parent, path) "
|
175 |
"values (?, ?)")
|
176 |
props = (parent, path) |
177 |
return self.execute(q, props).lastrowid |
178 |
|
179 |
def node_lookup(self, path): |
180 |
"""Lookup the current node of the given path.
|
181 |
Return None if the path is not found.
|
182 |
"""
|
183 |
|
184 |
q = "select node from nodes where path = ?"
|
185 |
self.execute(q, (path,))
|
186 |
r = self.fetchone()
|
187 |
if r is not None: |
188 |
return r[0] |
189 |
return None |
190 |
|
191 |
def node_get_properties(self, node): |
192 |
"""Return the node's (parent, path).
|
193 |
Return None if the node is not found.
|
194 |
"""
|
195 |
|
196 |
q = "select parent, path from nodes where node = ?"
|
197 |
self.execute(q, (node,))
|
198 |
return self.fetchone() |
199 |
|
200 |
def node_get_versions(self, node, keys=(), propnames=_propnames): |
201 |
"""Return the properties of all versions at node.
|
202 |
If keys is empty, return all properties in the order
|
203 |
(serial, node, size, source, mtime, muser, cluster).
|
204 |
"""
|
205 |
|
206 |
q = ("select serial, node, hash, size, source, mtime, muser, cluster "
|
207 |
"from versions "
|
208 |
"where node = ?")
|
209 |
self.execute(q, (node,))
|
210 |
r = self.fetchall()
|
211 |
if r is None: |
212 |
return r
|
213 |
|
214 |
if not keys: |
215 |
return r
|
216 |
return [[p[propnames[k]] for k in keys if k in propnames] for p in r] |
217 |
|
218 |
def node_count_children(self, node): |
219 |
"""Return node's child count."""
|
220 |
|
221 |
q = "select count(node) from nodes where parent = ? and node != 0"
|
222 |
self.execute(q, (node,))
|
223 |
r = self.fetchone()
|
224 |
if r is None: |
225 |
return 0 |
226 |
return r[0] |
227 |
|
228 |
def node_purge_children(self, parent, before=inf, cluster=0): |
229 |
"""Delete all versions with the specified
|
230 |
parent and cluster, and return
|
231 |
the hashes of versions deleted.
|
232 |
Clears out nodes with no remaining versions.
|
233 |
"""
|
234 |
|
235 |
execute = self.execute
|
236 |
q = ("select count(serial), sum(size) from versions "
|
237 |
"where node in (select node "
|
238 |
"from nodes "
|
239 |
"where parent = ?) "
|
240 |
"and cluster = ? "
|
241 |
"and mtime <= ?")
|
242 |
args = (parent, cluster, before) |
243 |
execute(q, args) |
244 |
nr, size = self.fetchone()
|
245 |
if not nr: |
246 |
return ()
|
247 |
mtime = time() |
248 |
self.statistics_update(parent, -nr, -size, mtime, cluster)
|
249 |
self.statistics_update_ancestors(parent, -nr, -size, mtime, cluster)
|
250 |
|
251 |
q = ("select hash from versions "
|
252 |
"where node in (select node "
|
253 |
"from nodes "
|
254 |
"where parent = ?) "
|
255 |
"and cluster = ? "
|
256 |
"and mtime <= ?")
|
257 |
execute(q, args) |
258 |
hashes = [r[0] for r in self.fetchall()] |
259 |
q = ("delete from versions "
|
260 |
"where node in (select node "
|
261 |
"from nodes "
|
262 |
"where parent = ?) "
|
263 |
"and cluster = ? "
|
264 |
"and mtime <= ?")
|
265 |
execute(q, args) |
266 |
q = ("delete from nodes "
|
267 |
"where node in (select node from nodes n "
|
268 |
"where (select count(serial) "
|
269 |
"from versions "
|
270 |
"where node = n.node) = 0 "
|
271 |
"and parent = ?)")
|
272 |
execute(q, (parent,)) |
273 |
return hashes
|
274 |
|
275 |
def node_purge(self, node, before=inf, cluster=0): |
276 |
"""Delete all versions with the specified
|
277 |
node and cluster, and return
|
278 |
the hashes of versions deleted.
|
279 |
Clears out the node if it has no remaining versions.
|
280 |
"""
|
281 |
|
282 |
execute = self.execute
|
283 |
q = ("select count(serial), sum(size) from versions "
|
284 |
"where node = ? "
|
285 |
"and cluster = ? "
|
286 |
"and mtime <= ?")
|
287 |
args = (node, cluster, before) |
288 |
execute(q, args) |
289 |
nr, size = self.fetchone()
|
290 |
if not nr: |
291 |
return ()
|
292 |
mtime = time() |
293 |
self.statistics_update_ancestors(node, -nr, -size, mtime, cluster)
|
294 |
|
295 |
q = ("select hash from versions "
|
296 |
"where node = ? "
|
297 |
"and cluster = ? "
|
298 |
"and mtime <= ?")
|
299 |
execute(q, args) |
300 |
hashes = [r[0] for r in self.fetchall()] |
301 |
q = ("delete from versions "
|
302 |
"where node = ? "
|
303 |
"and cluster = ? "
|
304 |
"and mtime <= ?")
|
305 |
execute(q, args) |
306 |
q = ("delete from nodes "
|
307 |
"where node in (select node from nodes n "
|
308 |
"where (select count(serial) "
|
309 |
"from versions "
|
310 |
"where node = n.node) = 0 "
|
311 |
"and node = ?)")
|
312 |
execute(q, (node,)) |
313 |
return hashes
|
314 |
|
315 |
def node_remove(self, node): |
316 |
"""Remove the node specified.
|
317 |
Return false if the node has children or is not found.
|
318 |
"""
|
319 |
|
320 |
if self.node_count_children(node): |
321 |
return False |
322 |
|
323 |
mtime = time() |
324 |
q = ("select count(serial), sum(size), cluster "
|
325 |
"from versions "
|
326 |
"where node = ? "
|
327 |
"group by cluster")
|
328 |
self.execute(q, (node,))
|
329 |
for population, size, cluster in self.fetchall(): |
330 |
self.statistics_update_ancestors(node, -population, -size, mtime, cluster)
|
331 |
|
332 |
q = "delete from nodes where node = ?"
|
333 |
self.execute(q, (node,))
|
334 |
return True |
335 |
|
336 |
def policy_get(self, node): |
337 |
q = "select key, value from policy where node = ?"
|
338 |
self.execute(q, (node,))
|
339 |
return dict(self.fetchall()) |
340 |
|
341 |
def policy_set(self, node, policy): |
342 |
q = "insert or replace into policy (node, key, value) values (?, ?, ?)"
|
343 |
self.executemany(q, ((node, k, v) for k, v in policy.iteritems())) |
344 |
|
345 |
def statistics_get(self, node, cluster=0): |
346 |
"""Return population, total size and last mtime
|
347 |
for all versions under node that belong to the cluster.
|
348 |
"""
|
349 |
|
350 |
q = ("select population, size, mtime from statistics "
|
351 |
"where node = ? and cluster = ?")
|
352 |
self.execute(q, (node, cluster))
|
353 |
return self.fetchone() |
354 |
|
355 |
def statistics_update(self, node, population, size, mtime, cluster=0): |
356 |
"""Update the statistics of the given node.
|
357 |
Statistics keep track the population, total
|
358 |
size of objects and mtime in the node's namespace.
|
359 |
May be zero or positive or negative numbers.
|
360 |
"""
|
361 |
|
362 |
qs = ("select population, size from statistics "
|
363 |
"where node = ? and cluster = ?")
|
364 |
qu = ("insert or replace into statistics (node, population, size, mtime, cluster) "
|
365 |
"values (?, ?, ?, ?, ?)")
|
366 |
self.execute(qs, (node, cluster))
|
367 |
r = self.fetchone()
|
368 |
if r is None: |
369 |
prepopulation, presize = (0, 0) |
370 |
else:
|
371 |
prepopulation, presize = r |
372 |
population += prepopulation |
373 |
size += presize |
374 |
self.execute(qu, (node, population, size, mtime, cluster))
|
375 |
|
376 |
def statistics_update_ancestors(self, node, population, size, mtime, cluster=0): |
377 |
"""Update the statistics of the given node's parent.
|
378 |
Then recursively update all parents up to the root.
|
379 |
Population is not recursive.
|
380 |
"""
|
381 |
|
382 |
while True: |
383 |
if node == 0: |
384 |
break
|
385 |
props = self.node_get_properties(node)
|
386 |
if props is None: |
387 |
break
|
388 |
parent, path = props |
389 |
self.statistics_update(parent, population, size, mtime, cluster)
|
390 |
node = parent |
391 |
population = 0 # Population isn't recursive |
392 |
|
393 |
def statistics_latest(self, node, before=inf, except_cluster=0): |
394 |
"""Return population, total size and last mtime
|
395 |
for all latest versions under node that
|
396 |
do not belong to the cluster.
|
397 |
"""
|
398 |
|
399 |
execute = self.execute
|
400 |
fetchone = self.fetchone
|
401 |
|
402 |
# The node.
|
403 |
props = self.node_get_properties(node)
|
404 |
if props is None: |
405 |
return None |
406 |
parent, path = props |
407 |
|
408 |
# The latest version.
|
409 |
q = ("select serial, node, hash, size, source, mtime, muser, cluster "
|
410 |
"from versions "
|
411 |
"where serial = (select max(serial) "
|
412 |
"from versions "
|
413 |
"where node = ? and mtime < ?) "
|
414 |
"and cluster != ?")
|
415 |
execute(q, (node, before, except_cluster)) |
416 |
props = fetchone() |
417 |
if props is None: |
418 |
return None |
419 |
mtime = props[MTIME] |
420 |
|
421 |
# First level, just under node (get population).
|
422 |
q = ("select count(serial), sum(size), max(mtime) "
|
423 |
"from versions v "
|
424 |
"where serial = (select max(serial) "
|
425 |
"from versions "
|
426 |
"where node = v.node and mtime < ?) "
|
427 |
"and cluster != ? "
|
428 |
"and node in (select node "
|
429 |
"from nodes "
|
430 |
"where parent = ?)")
|
431 |
execute(q, (before, except_cluster, node)) |
432 |
r = fetchone() |
433 |
if r is None: |
434 |
return None |
435 |
count = r[0]
|
436 |
mtime = max(mtime, r[2]) |
437 |
if count == 0: |
438 |
return (0, 0, mtime) |
439 |
|
440 |
# All children (get size and mtime).
|
441 |
# XXX: This is why the full path is stored.
|
442 |
q = ("select count(serial), sum(size), max(mtime) "
|
443 |
"from versions v "
|
444 |
"where serial = (select max(serial) "
|
445 |
"from versions "
|
446 |
"where node = v.node and mtime < ?) "
|
447 |
"and cluster != ? "
|
448 |
"and node in (select node "
|
449 |
"from nodes "
|
450 |
"where path like ? escape '\\')")
|
451 |
execute(q, (before, except_cluster, self.escape_like(path) + '%')) |
452 |
r = fetchone() |
453 |
if r is None: |
454 |
return None |
455 |
size = r[1] - props[SIZE]
|
456 |
mtime = max(mtime, r[2]) |
457 |
return (count, size, mtime)
|
458 |
|
459 |
def version_create(self, node, hash, size, source, muser, cluster=0): |
460 |
"""Create a new version from the given properties.
|
461 |
Return the (serial, mtime) of the new version.
|
462 |
"""
|
463 |
|
464 |
q = ("insert into versions (node, hash, size, source, mtime, muser, cluster) "
|
465 |
"values (?, ?, ?, ?, ?, ?, ?)")
|
466 |
mtime = time() |
467 |
props = (node, hash, size, source, mtime, muser, cluster)
|
468 |
serial = self.execute(q, props).lastrowid
|
469 |
self.statistics_update_ancestors(node, 1, size, mtime, cluster) |
470 |
return serial, mtime
|
471 |
|
472 |
def version_lookup(self, node, before=inf, cluster=0): |
473 |
"""Lookup the current version of the given node.
|
474 |
Return a list with its properties:
|
475 |
(serial, node, hash, size, source, mtime, muser, cluster)
|
476 |
or None if the current version is not found in the given cluster.
|
477 |
"""
|
478 |
|
479 |
q = ("select serial, node, hash, size, source, mtime, muser, cluster "
|
480 |
"from versions "
|
481 |
"where serial = (select max(serial) "
|
482 |
"from versions "
|
483 |
"where node = ? and mtime < ?) "
|
484 |
"and cluster = ?")
|
485 |
self.execute(q, (node, before, cluster))
|
486 |
props = self.fetchone()
|
487 |
if props is not None: |
488 |
return props
|
489 |
return None |
490 |
|
491 |
def version_get_properties(self, serial, keys=(), propnames=_propnames): |
492 |
"""Return a sequence of values for the properties of
|
493 |
the version specified by serial and the keys, in the order given.
|
494 |
If keys is empty, return all properties in the order
|
495 |
(serial, node, hash, size, source, mtime, muser, cluster).
|
496 |
"""
|
497 |
|
498 |
q = ("select serial, node, hash, size, source, mtime, muser, cluster "
|
499 |
"from versions "
|
500 |
"where serial = ?")
|
501 |
self.execute(q, (serial,))
|
502 |
r = self.fetchone()
|
503 |
if r is None: |
504 |
return r
|
505 |
|
506 |
if not keys: |
507 |
return r
|
508 |
return [r[propnames[k]] for k in keys if k in propnames] |
509 |
|
510 |
def version_recluster(self, serial, cluster): |
511 |
"""Move the version into another cluster."""
|
512 |
|
513 |
props = self.version_get_properties(serial)
|
514 |
if not props: |
515 |
return
|
516 |
node = props[NODE] |
517 |
size = props[SIZE] |
518 |
oldcluster = props[CLUSTER] |
519 |
if cluster == oldcluster:
|
520 |
return
|
521 |
|
522 |
mtime = time() |
523 |
self.statistics_update_ancestors(node, -1, -size, mtime, oldcluster) |
524 |
self.statistics_update_ancestors(node, 1, size, mtime, cluster) |
525 |
|
526 |
q = "update versions set cluster = ? where serial = ?"
|
527 |
self.execute(q, (cluster, serial))
|
528 |
|
529 |
def version_remove(self, serial): |
530 |
"""Remove the serial specified."""
|
531 |
|
532 |
props = self.version_get_properties(serial)
|
533 |
if not props: |
534 |
return
|
535 |
node = props[NODE] |
536 |
hash = props[HASH] |
537 |
size = props[SIZE] |
538 |
cluster = props[CLUSTER] |
539 |
|
540 |
mtime = time() |
541 |
self.statistics_update_ancestors(node, -1, -size, mtime, cluster) |
542 |
|
543 |
q = "delete from versions where serial = ?"
|
544 |
self.execute(q, (serial,))
|
545 |
return hash |
546 |
|
547 |
def attribute_get(self, serial, keys=()): |
548 |
"""Return a list of (key, value) pairs of the version specified by serial.
|
549 |
If keys is empty, return all attributes.
|
550 |
Othwerise, return only those specified.
|
551 |
"""
|
552 |
|
553 |
execute = self.execute
|
554 |
if keys:
|
555 |
marks = ','.join('?' for k in keys) |
556 |
q = ("select key, value from attributes "
|
557 |
"where key in (%s) and serial = ?" % (marks,))
|
558 |
execute(q, keys + (serial,)) |
559 |
else:
|
560 |
q = "select key, value from attributes where serial = ?"
|
561 |
execute(q, (serial,)) |
562 |
return self.fetchall() |
563 |
|
564 |
def attribute_set(self, serial, items): |
565 |
"""Set the attributes of the version specified by serial.
|
566 |
Receive attributes as an iterable of (key, value) pairs.
|
567 |
"""
|
568 |
|
569 |
q = ("insert or replace into attributes (serial, key, value) "
|
570 |
"values (?, ?, ?)")
|
571 |
self.executemany(q, ((serial, k, v) for k, v in items)) |
572 |
|
573 |
def attribute_del(self, serial, keys=()): |
574 |
"""Delete attributes of the version specified by serial.
|
575 |
If keys is empty, delete all attributes.
|
576 |
Otherwise delete those specified.
|
577 |
"""
|
578 |
|
579 |
if keys:
|
580 |
q = "delete from attributes where serial = ? and key = ?"
|
581 |
self.executemany(q, ((serial, key) for key in keys)) |
582 |
else:
|
583 |
q = "delete from attributes where serial = ?"
|
584 |
self.execute(q, (serial,))
|
585 |
|
586 |
def attribute_copy(self, source, dest): |
587 |
q = ("insert or replace into attributes "
|
588 |
"select ?, key, value from attributes "
|
589 |
"where serial = ?")
|
590 |
self.execute(q, (dest, source))
|
591 |
|
592 |
def _construct_filters(self, filterq): |
593 |
if not filterq: |
594 |
return None, None |
595 |
|
596 |
args = filterq.split(',')
|
597 |
subq = " and a.key in ("
|
598 |
subq += ','.join(('?' for x in args)) |
599 |
subq += ")"
|
600 |
|
601 |
return subq, args
|
602 |
|
603 |
def _construct_paths(self, pathq): |
604 |
if not pathq: |
605 |
return None, None |
606 |
|
607 |
subq = " and ("
|
608 |
subq += ' or '.join(("n.path like ? escape '\\'" for x in pathq)) |
609 |
subq += ")"
|
610 |
args = tuple([self.escape_like(x) + '%' for x in pathq]) |
611 |
|
612 |
return subq, args
|
613 |
|
614 |
def latest_attribute_keys(self, parent, before=inf, except_cluster=0, pathq=[]): |
615 |
"""Return a list with all keys pairs defined
|
616 |
for all latest versions under parent that
|
617 |
do not belong to the cluster.
|
618 |
"""
|
619 |
|
620 |
# TODO: Use another table to store before=inf results.
|
621 |
q = ("select distinct a.key "
|
622 |
"from attributes a, versions v, nodes n "
|
623 |
"where v.serial = (select max(serial) "
|
624 |
"from versions "
|
625 |
"where node = v.node and mtime < ?) "
|
626 |
"and v.cluster != ? "
|
627 |
"and v.node in (select node "
|
628 |
"from nodes "
|
629 |
"where parent = ?) "
|
630 |
"and a.serial = v.serial "
|
631 |
"and n.node = v.node")
|
632 |
args = (before, except_cluster, parent) |
633 |
subq, subargs = self._construct_paths(pathq)
|
634 |
if subq is not None: |
635 |
q += subq |
636 |
args += subargs |
637 |
self.execute(q, args)
|
638 |
return [r[0] for r in self.fetchall()] |
639 |
|
640 |
def latest_version_list(self, parent, prefix='', delimiter=None, |
641 |
start='', limit=10000, before=inf, |
642 |
except_cluster=0, pathq=[], filterq=None): |
643 |
"""Return a (list of (path, serial) tuples, list of common prefixes)
|
644 |
for the current versions of the paths with the given parent,
|
645 |
matching the following criteria.
|
646 |
|
647 |
The property tuple for a version is returned if all
|
648 |
of these conditions are true:
|
649 |
|
650 |
a. parent matches
|
651 |
|
652 |
b. path > start
|
653 |
|
654 |
c. path starts with prefix (and paths in pathq)
|
655 |
|
656 |
d. version is the max up to before
|
657 |
|
658 |
e. version is not in cluster
|
659 |
|
660 |
f. the path does not have the delimiter occuring
|
661 |
after the prefix, or ends with the delimiter
|
662 |
|
663 |
g. serial matches the attribute filter query.
|
664 |
|
665 |
A filter query is a comma-separated list of
|
666 |
terms in one of these three forms:
|
667 |
|
668 |
key
|
669 |
an attribute with this key must exist
|
670 |
|
671 |
!key
|
672 |
an attribute with this key must not exist
|
673 |
|
674 |
key ?op value
|
675 |
the attribute with this key satisfies the value
|
676 |
where ?op is one of ==, != <=, >=, <, >.
|
677 |
|
678 |
The list of common prefixes includes the prefixes
|
679 |
matching up to the first delimiter after prefix,
|
680 |
and are reported only once, as "virtual directories".
|
681 |
The delimiter is included in the prefixes.
|
682 |
|
683 |
If arguments are None, then the corresponding matching rule
|
684 |
will always match.
|
685 |
|
686 |
Limit applies to the first list of tuples returned.
|
687 |
"""
|
688 |
|
689 |
execute = self.execute
|
690 |
|
691 |
if not start or start < prefix: |
692 |
start = strprevling(prefix) |
693 |
nextling = strnextling(prefix) |
694 |
|
695 |
q = ("select distinct n.path, v.serial "
|
696 |
"from attributes a, versions v, nodes n "
|
697 |
"where v.serial = (select max(serial) "
|
698 |
"from versions "
|
699 |
"where node = v.node and mtime < ?) "
|
700 |
"and v.cluster != ? "
|
701 |
"and v.node in (select node "
|
702 |
"from nodes "
|
703 |
"where parent = ?) "
|
704 |
"and a.serial = v.serial "
|
705 |
"and n.node = v.node "
|
706 |
"and n.path > ? and n.path < ?")
|
707 |
args = [before, except_cluster, parent, start, nextling] |
708 |
|
709 |
subq, subargs = self._construct_paths(pathq)
|
710 |
if subq is not None: |
711 |
q += subq |
712 |
args += subargs |
713 |
subq, subargs = self._construct_filters(filterq)
|
714 |
if subq is not None: |
715 |
q += subq |
716 |
args += subargs |
717 |
else:
|
718 |
q = q.replace("attributes a, ", "") |
719 |
q = q.replace("and a.serial = v.serial ", "") |
720 |
q += " order by n.path"
|
721 |
|
722 |
if not delimiter: |
723 |
q += " limit ?"
|
724 |
args.append(limit) |
725 |
execute(q, args) |
726 |
return self.fetchall(), () |
727 |
|
728 |
pfz = len(prefix)
|
729 |
dz = len(delimiter)
|
730 |
count = 0
|
731 |
fetchone = self.fetchone
|
732 |
prefixes = [] |
733 |
pappend = prefixes.append |
734 |
matches = [] |
735 |
mappend = matches.append |
736 |
|
737 |
execute(q, args) |
738 |
while True: |
739 |
props = fetchone() |
740 |
if props is None: |
741 |
break
|
742 |
path, serial = props |
743 |
idx = path.find(delimiter, pfz) |
744 |
|
745 |
if idx < 0: |
746 |
mappend(props) |
747 |
count += 1
|
748 |
if count >= limit:
|
749 |
break
|
750 |
continue
|
751 |
|
752 |
if idx + dz == len(path): |
753 |
mappend(props) |
754 |
count += 1
|
755 |
continue # Get one more, in case there is a path. |
756 |
pf = path[:idx + dz] |
757 |
pappend(pf) |
758 |
if count >= limit:
|
759 |
break
|
760 |
|
761 |
args[3] = strnextling(pf) # New start. |
762 |
execute(q, args) |
763 |
|
764 |
return matches, prefixes
|