1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2012 Steffen Hoffmann <hoff.st@web.de>
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution.
from trac.resource import Resource
from trac.util.compat import groupby
# Public functions (not yet)
# Utility functions
def tag_resource(env, realm, id, new_id=None, tags=None, db=None):
"""Change recorded tags for a Trac resource.
This function combines delete, reparent and set actions now, but it could
possibly be still a bit more efficient.
"""
db = _get_db(env, db)
cursor = db.cursor()
if new_id:
cursor.execute("""
UPDATE tags
SET name=%s
WHERE tagspace=%s
AND name=%s
""", (new_id, realm, id))
else:
# DEVEL: Work out the difference instead of stupid delete/re-insertion.
cursor.execute("""
DELETE FROM tags
WHERE tagspace=%s
AND name=%s
""", (realm, id))
if tags:
cursor.executemany("""
INSERT INTO tags
(tagspace, name, tag)
VALUES (%s,%s,%s)
""", [(realm, id, tag) for tag in tags])
db.commit()
def tagged_resources(env, perm_check, perm, realm, tags=None, filter=None,
db=None):
"""Return Trac resources including their associated tags.
This is currently known to be a major performance hog.
"""
db = _get_db(env, db)
cursor = db.cursor()
args = [realm]
sql = """
SELECT DISTINCT name
FROM tags
WHERE tagspace=%s"""
if filter:
sql += ''.join([" AND %s" % f for f in filter])
if tags:
sql += " AND tags.tag IN (%s)" % ','.join(['%s' for tag in tags])
args += tags
sql += " ORDER by name"
cursor.execute(sql, args)
# Inlined permission check for efficiency.
resources = {}
for name, in cursor:
resource = Resource(realm, name)
if perm_check(perm(resource), 'view'):
resources[resource.id] = resource
if not resources:
return
args = [realm] + resources.keys()
# DEVEL: Is this going to be excruciatingly slow?
# The explicite resource ID list might even grow beyond some limit.
sql = """
SELECT DISTINCT name, tag
FROM tags
WHERE tagspace=%%s
AND name IN (%s)
ORDER BY name
""" % ', '.join(['%s' for resource in resources])
cursor.execute(sql, args)
for name, tags in groupby(cursor, lambda row: row[0]):
resource = resources[name]
yield resource, set([tag[1] for tag in tags])
def resource_tags(env, realm, id, db=None):
"""Return all tags for a Trac resource by realm and ID."""
db = _get_db(env, db)
cursor = db.cursor()
cursor.execute("""
SELECT tag
FROM tags
WHERE tagspace=%s
AND name=%s
""", (realm, id))
for row in cursor:
yield row[0]
# Internal functions
def _get_db(env, db=None):
return db or env.get_db_cnx()
|
