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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
# Authors:
# Jason Gerard DeRose <jderose@redhat.com>
#
# Copyright (C) 2008 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Base classes for all backed-end plugins.
"""
import threading
import plugable
from errors import PublicError, InternalError, CommandError
from request import context, Connection, destroy_context
class Backend(plugable.Plugin):
"""
Base class for all backend plugins.
"""
class Connectible(Backend):
"""
Base class for backend plugins that create connections.
In addition to the nicety of providing a standard connection API, all
backend plugins that create connections should use this base class so that
`request.destroy_context()` can properly close all open connections.
"""
def __init__(self, shared_instance=True):
Backend.__init__(self)
if shared_instance:
self.id = self.name
else:
self.id = '%s_%s' % (self.name, str(id(self)))
def connect(self, *args, **kw):
"""
Create thread-local connection.
"""
if hasattr(context, self.id):
raise StandardError(
"connect: 'context.%s' already exists in thread %r" % (
self.id, threading.currentThread().getName()
)
)
conn = self.create_connection(*args, **kw)
setattr(context, self.id, Connection(conn, self.disconnect))
assert self.conn is conn
self.debug('Created connection context.%s' % self.id)
def create_connection(self, *args, **kw):
raise NotImplementedError('%s.create_connection()' % self.id)
def disconnect(self):
if not hasattr(context, self.id):
raise StandardError(
"disconnect: 'context.%s' does not exist in thread %r" % (
self.id, threading.currentThread().getName()
)
)
self.destroy_connection()
delattr(context, self.id)
self.debug('Destroyed connection context.%s' % self.id)
def destroy_connection(self):
raise NotImplementedError('%s.destroy_connection()' % self.id)
def isconnected(self):
"""
Return ``True`` if thread-local connection on `request.context` exists.
"""
return hasattr(context, self.id)
def __get_conn(self):
"""
Return thread-local connection.
"""
if not hasattr(context, self.id):
raise AttributeError('no context.%s in thread %r' % (
self.id, threading.currentThread().getName())
)
return getattr(context, self.id).conn
conn = property(__get_conn)
class Executioner(Backend):
def create_context(self, ccache=None, client_ip=None):
"""
client_ip: The IP address of the remote client.
"""
if self.env.in_server:
self.Backend.ldap2.connect(ccache=ccache)
else:
self.Backend.xmlclient.connect(verbose=(self.env.verbose >= 2),
fallback=self.env.fallback)
if client_ip is not None:
setattr(context, "client_ip", client_ip)
def destroy_context(self):
destroy_context()
def execute(self, _name, *args, **options):
error = None
try:
if _name not in self.Command:
raise CommandError(name=_name)
result = self.Command[_name](*args, **options)
except PublicError, e:
error = e
except StandardError, e:
self.exception(
'non-public: %s: %s', e.__class__.__name__, str(e)
)
error = InternalError()
except Exception, e:
self.exception(
'unhandled exception: %s: %s', e.__class__.__name__, str(e)
)
error = InternalError()
destroy_context()
if error is None:
return result
assert isinstance(error, PublicError)
raise error
|
