This file is indexed.

/usr/share/pyshared/sqlalchemy/engine/strategies.py is in python-sqlalchemy 0.7.4-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
# engine/strategies.py
# Copyright (C) 2005-2011 the SQLAlchemy authors and contributors <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""Strategies for creating new instances of Engine types.

These are semi-private implementation classes which provide the
underlying behavior for the "strategy" keyword argument available on
:func:`~sqlalchemy.engine.create_engine`.  Current available options are
``plain``, ``threadlocal``, and ``mock``.

New strategies can be added via new ``EngineStrategy`` classes.
"""

from operator import attrgetter

from sqlalchemy.engine import base, threadlocal, url
from sqlalchemy import util, exc, event
from sqlalchemy import pool as poollib

strategies = {}


class EngineStrategy(object):
    """An adaptor that processes input arguements and produces an Engine.

    Provides a ``create`` method that receives input arguments and
    produces an instance of base.Engine or a subclass.

    """

    def __init__(self):
        strategies[self.name] = self

    def create(self, *args, **kwargs):
        """Given arguments, returns a new Engine instance."""

        raise NotImplementedError()


class DefaultEngineStrategy(EngineStrategy):
    """Base class for built-in stratgies."""

    def create(self, name_or_url, **kwargs):
        # create url.URL object
        u = url.make_url(name_or_url)

        dialect_cls = u.get_dialect()

        dialect_args = {}
        # consume dialect arguments from kwargs
        for k in util.get_cls_kwargs(dialect_cls):
            if k in kwargs:
                dialect_args[k] = kwargs.pop(k)

        dbapi = kwargs.pop('module', None)
        if dbapi is None:
            dbapi_args = {}
            for k in util.get_func_kwargs(dialect_cls.dbapi):
                if k in kwargs:
                    dbapi_args[k] = kwargs.pop(k)
            dbapi = dialect_cls.dbapi(**dbapi_args)

        dialect_args['dbapi'] = dbapi

        # create dialect
        dialect = dialect_cls(**dialect_args)

        # assemble connection arguments
        (cargs, cparams) = dialect.create_connect_args(u)
        cparams.update(kwargs.pop('connect_args', {}))

        # look for existing pool or create
        pool = kwargs.pop('pool', None)
        if pool is None:
            def connect():
                try:
                    return dialect.connect(*cargs, **cparams)
                except Exception, e:
                    # Py3K
                    #raise exc.DBAPIError.instance(None, None, 
                    #                   e, dialect.dbapi.Error,
                    #                   connection_invalidated=
                    #                       dialect.is_disconnect(e, None, None)
                    #                       ) from e
                    # Py2K
                    import sys
                    raise exc.DBAPIError.instance(
                                None, None, e, dialect.dbapi.Error,
                                connection_invalidated=
                                        dialect.is_disconnect(e, None, None)), \
                                None, sys.exc_info()[2]
                    # end Py2K

            creator = kwargs.pop('creator', connect)

            poolclass = kwargs.pop('poolclass', None)
            if poolclass is None:
                poolclass = dialect_cls.get_pool_class(u)
            pool_args = {}

            # consume pool arguments from kwargs, translating a few of
            # the arguments
            translate = {'logging_name': 'pool_logging_name',
                         'echo': 'echo_pool',
                         'timeout': 'pool_timeout',
                         'recycle': 'pool_recycle',
                         'events':'pool_events',
                         'use_threadlocal':'pool_threadlocal'}
            for k in util.get_cls_kwargs(poolclass):
                tk = translate.get(k, k)
                if tk in kwargs:
                    pool_args[k] = kwargs.pop(tk)
            pool = poolclass(creator, **pool_args)
        else:
            if isinstance(pool, poollib._DBProxy):
                pool = pool.get_pool(*cargs, **cparams)
            else:
                pool = pool

        # create engine.
        engineclass = self.engine_cls
        engine_args = {}
        for k in util.get_cls_kwargs(engineclass):
            if k in kwargs:
                engine_args[k] = kwargs.pop(k)

        _initialize = kwargs.pop('_initialize', True)

        # all kwargs should be consumed
        if kwargs:
            raise TypeError(
                "Invalid argument(s) %s sent to create_engine(), "
                "using configuration %s/%s/%s.  Please check that the "
                "keyword arguments are appropriate for this combination "
                "of components." % (','.join("'%s'" % k for k in kwargs),
                                    dialect.__class__.__name__,
                                    pool.__class__.__name__,
                                    engineclass.__name__))

        engine = engineclass(pool, dialect, u, **engine_args)

        if _initialize:
            do_on_connect = dialect.on_connect()
            if do_on_connect:
                def on_connect(dbapi_connection, connection_record):
                    conn = getattr(dbapi_connection, '_sqla_unwrap', dbapi_connection)
                    if conn is None:
                        return
                    do_on_connect(conn)

                event.listen(pool, 'first_connect', on_connect)
                event.listen(pool, 'connect', on_connect)

            def first_connect(dbapi_connection, connection_record):
                c = base.Connection(engine, connection=dbapi_connection)

                # TODO: removing this allows the on connect activities
                # to generate events.  tests currently assume these aren't
                # sent.  do we want users to get all the initial connect
                # activities as events ?
                c._has_events = False

                dialect.initialize(c)
            event.listen(pool, 'first_connect', first_connect)

        return engine


class PlainEngineStrategy(DefaultEngineStrategy):
    """Strategy for configuring a regular Engine."""

    name = 'plain'
    engine_cls = base.Engine

PlainEngineStrategy()


class ThreadLocalEngineStrategy(DefaultEngineStrategy):
    """Strategy for configuring an Engine with thredlocal behavior."""

    name = 'threadlocal'
    engine_cls = threadlocal.TLEngine

ThreadLocalEngineStrategy()


class MockEngineStrategy(EngineStrategy):
    """Strategy for configuring an Engine-like object with mocked execution.

    Produces a single mock Connectable object which dispatches
    statement execution to a passed-in function.

    """

    name = 'mock'

    def create(self, name_or_url, executor, **kwargs):
        # create url.URL object
        u = url.make_url(name_or_url)

        dialect_cls = u.get_dialect()

        dialect_args = {}
        # consume dialect arguments from kwargs
        for k in util.get_cls_kwargs(dialect_cls):
            if k in kwargs:
                dialect_args[k] = kwargs.pop(k)

        # create dialect
        dialect = dialect_cls(**dialect_args)

        return MockEngineStrategy.MockConnection(dialect, executor)

    class MockConnection(base.Connectable):
        def __init__(self, dialect, execute):
            self._dialect = dialect
            self.execute = execute

        engine = property(lambda s: s)
        dialect = property(attrgetter('_dialect'))
        name = property(lambda s: s._dialect.name)

        def contextual_connect(self, **kwargs):
            return self

        def compiler(self, statement, parameters, **kwargs):
            return self._dialect.compiler(
                statement, parameters, engine=self, **kwargs)

        def create(self, entity, **kwargs):
            kwargs['checkfirst'] = False
            from sqlalchemy.engine import ddl

            ddl.SchemaGenerator(self.dialect, self, **kwargs).traverse(entity)

        def drop(self, entity, **kwargs):
            kwargs['checkfirst'] = False
            from sqlalchemy.engine import ddl
            ddl.SchemaDropper(self.dialect, self, **kwargs).traverse(entity)

        def _run_visitor(self, visitorcallable, element, 
                                        connection=None, 
                                        **kwargs):
            kwargs['checkfirst'] = False
            visitorcallable(self.dialect, self,
                                **kwargs).traverse(element)

        def execute(self, object, *multiparams, **params):
            raise NotImplementedError()

MockEngineStrategy()