/usr/lib/python2.7/dist-packages/sqlalchemy/testing/engines.py is in python-sqlalchemy 0.8.4-1build1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 | from __future__ import absolute_import
import types
import weakref
from collections import deque
from . import config
from .util import decorator
from .. import event, pool
import re
import warnings
class ConnectionKiller(object):
def __init__(self):
self.proxy_refs = weakref.WeakKeyDictionary()
self.testing_engines = weakref.WeakKeyDictionary()
self.conns = set()
def add_engine(self, engine):
self.testing_engines[engine] = True
def connect(self, dbapi_conn, con_record):
self.conns.add((dbapi_conn, con_record))
def checkout(self, dbapi_con, con_record, con_proxy):
self.proxy_refs[con_proxy] = True
def _safe(self, fn):
try:
fn()
except (SystemExit, KeyboardInterrupt):
raise
except Exception, e:
warnings.warn(
"testing_reaper couldn't "
"rollback/close connection: %s" % e)
def rollback_all(self):
for rec in self.proxy_refs.keys():
if rec is not None and rec.is_valid:
self._safe(rec.rollback)
def close_all(self):
for rec in self.proxy_refs.keys():
if rec is not None:
self._safe(rec._close)
def _after_test_ctx(self):
pass
# this can cause a deadlock with pg8000 - pg8000 acquires
# prepared statment lock inside of rollback() - if async gc
# is collecting in finalize_fairy, deadlock.
# not sure if this should be if pypy/jython only.
# note that firebird/fdb definitely needs this though
for conn, rec in self.conns:
self._safe(conn.rollback)
def _stop_test_ctx(self):
if config.options.low_connections:
self._stop_test_ctx_minimal()
else:
self._stop_test_ctx_aggressive()
def _stop_test_ctx_minimal(self):
self.close_all()
self.conns = set()
for rec in self.testing_engines.keys():
if rec is not config.db:
rec.dispose()
def _stop_test_ctx_aggressive(self):
self.close_all()
for conn, rec in self.conns:
self._safe(conn.close)
rec.connection = None
self.conns = set()
for rec in self.testing_engines.keys():
rec.dispose()
def assert_all_closed(self):
for rec in self.proxy_refs:
if rec.is_valid:
assert False
testing_reaper = ConnectionKiller()
def drop_all_tables(metadata, bind):
testing_reaper.close_all()
if hasattr(bind, 'close'):
bind.close()
metadata.drop_all(bind)
@decorator
def assert_conns_closed(fn, *args, **kw):
try:
fn(*args, **kw)
finally:
testing_reaper.assert_all_closed()
@decorator
def rollback_open_connections(fn, *args, **kw):
"""Decorator that rolls back all open connections after fn execution."""
try:
fn(*args, **kw)
finally:
testing_reaper.rollback_all()
@decorator
def close_first(fn, *args, **kw):
"""Decorator that closes all connections before fn execution."""
testing_reaper.close_all()
fn(*args, **kw)
@decorator
def close_open_connections(fn, *args, **kw):
"""Decorator that closes all connections after fn execution."""
try:
fn(*args, **kw)
finally:
testing_reaper.close_all()
def all_dialects(exclude=None):
import sqlalchemy.databases as d
for name in d.__all__:
# TEMPORARY
if exclude and name in exclude:
continue
mod = getattr(d, name, None)
if not mod:
mod = getattr(__import__(
'sqlalchemy.databases.%s' % name).databases, name)
yield mod.dialect()
class ReconnectFixture(object):
def __init__(self, dbapi):
self.dbapi = dbapi
self.connections = []
def __getattr__(self, key):
return getattr(self.dbapi, key)
def connect(self, *args, **kwargs):
conn = self.dbapi.connect(*args, **kwargs)
self.connections.append(conn)
return conn
def _safe(self, fn):
try:
fn()
except (SystemExit, KeyboardInterrupt):
raise
except Exception, e:
warnings.warn(
"ReconnectFixture couldn't "
"close connection: %s" % e)
def shutdown(self):
# TODO: this doesn't cover all cases
# as nicely as we'd like, namely MySQLdb.
# would need to implement R. Brewer's
# proxy server idea to get better
# coverage.
for c in list(self.connections):
self._safe(c.close)
self.connections = []
def reconnecting_engine(url=None, options=None):
url = url or config.db_url
dbapi = config.db.dialect.dbapi
if not options:
options = {}
options['module'] = ReconnectFixture(dbapi)
engine = testing_engine(url, options)
_dispose = engine.dispose
def dispose():
engine.dialect.dbapi.shutdown()
_dispose()
engine.test_shutdown = engine.dialect.dbapi.shutdown
engine.dispose = dispose
return engine
def testing_engine(url=None, options=None):
"""Produce an engine configured by --options with optional overrides."""
from sqlalchemy import create_engine
from .assertsql import asserter
if not options:
use_reaper = True
else:
use_reaper = options.pop('use_reaper', True)
url = url or config.db_url
if options is None:
options = config.db_opts
engine = create_engine(url, **options)
if isinstance(engine.pool, pool.QueuePool):
engine.pool._timeout = 0
engine.pool._max_overflow = 0
event.listen(engine, 'after_execute', asserter.execute)
event.listen(engine, 'after_cursor_execute', asserter.cursor_execute)
if use_reaper:
event.listen(engine.pool, 'connect', testing_reaper.connect)
event.listen(engine.pool, 'checkout', testing_reaper.checkout)
testing_reaper.add_engine(engine)
return engine
def utf8_engine(url=None, options=None):
"""Hook for dialects or drivers that don't handle utf8 by default."""
from sqlalchemy.engine import url as engine_url
if config.db.dialect.name == 'mysql' and \
config.db.driver in ['mysqldb', 'pymysql', 'cymysql']:
# note 1.2.1.gamma.6 or greater of MySQLdb
# needed here
url = url or config.db_url
url = engine_url.make_url(url)
url.query['charset'] = 'utf8'
url.query['use_unicode'] = '0'
url = str(url)
return testing_engine(url, options)
def mock_engine(dialect_name=None):
"""Provides a mocking engine based on the current testing.db.
This is normally used to test DDL generation flow as emitted
by an Engine.
It should not be used in other cases, as assert_compile() and
assert_sql_execution() are much better choices with fewer
moving parts.
"""
from sqlalchemy import create_engine
if not dialect_name:
dialect_name = config.db.name
buffer = []
def executor(sql, *a, **kw):
buffer.append(sql)
def assert_sql(stmts):
recv = [re.sub(r'[\n\t]', '', str(s)) for s in buffer]
assert recv == stmts, recv
def print_sql():
d = engine.dialect
return "\n".join(
str(s.compile(dialect=d))
for s in engine.mock
)
engine = create_engine(dialect_name + '://',
strategy='mock', executor=executor)
assert not hasattr(engine, 'mock')
engine.mock = buffer
engine.assert_sql = assert_sql
engine.print_sql = print_sql
return engine
class DBAPIProxyCursor(object):
"""Proxy a DBAPI cursor.
Tests can provide subclasses of this to intercept
DBAPI-level cursor operations.
"""
def __init__(self, engine, conn):
self.engine = engine
self.connection = conn
self.cursor = conn.cursor()
def execute(self, stmt, parameters=None, **kw):
if parameters:
return self.cursor.execute(stmt, parameters, **kw)
else:
return self.cursor.execute(stmt, **kw)
def executemany(self, stmt, params, **kw):
return self.cursor.executemany(stmt, params, **kw)
def __getattr__(self, key):
return getattr(self.cursor, key)
class DBAPIProxyConnection(object):
"""Proxy a DBAPI connection.
Tests can provide subclasses of this to intercept
DBAPI-level connection operations.
"""
def __init__(self, engine, cursor_cls):
self.conn = self._sqla_unwrap = engine.pool._creator()
self.engine = engine
self.cursor_cls = cursor_cls
def cursor(self):
return self.cursor_cls(self.engine, self.conn)
def close(self):
self.conn.close()
def __getattr__(self, key):
return getattr(self.conn, key)
def proxying_engine(conn_cls=DBAPIProxyConnection,
cursor_cls=DBAPIProxyCursor):
"""Produce an engine that provides proxy hooks for
common methods.
"""
def mock_conn():
return conn_cls(config.db, cursor_cls)
return testing_engine(options={'creator': mock_conn})
class ReplayableSession(object):
"""A simple record/playback tool.
This is *not* a mock testing class. It only records a session for later
playback and makes no assertions on call consistency whatsoever. It's
unlikely to be suitable for anything other than DB-API recording.
"""
Callable = object()
NoAttribute = object()
# Py3K
#Natives = set([getattr(types, t)
# for t in dir(types) if not t.startswith('_')]). \
# union([type(t) if not isinstance(t, type)
# else t for t in __builtins__.values()]).\
# difference([getattr(types, t)
# for t in ('FunctionType', 'BuiltinFunctionType',
# 'MethodType', 'BuiltinMethodType',
# 'LambdaType', )])
# Py2K
Natives = set([getattr(types, t)
for t in dir(types) if not t.startswith('_')]). \
difference([getattr(types, t)
for t in ('FunctionType', 'BuiltinFunctionType',
'MethodType', 'BuiltinMethodType',
'LambdaType', 'UnboundMethodType',)])
# end Py2K
def __init__(self):
self.buffer = deque()
def recorder(self, base):
return self.Recorder(self.buffer, base)
def player(self):
return self.Player(self.buffer)
class Recorder(object):
def __init__(self, buffer, subject):
self._buffer = buffer
self._subject = subject
def __call__(self, *args, **kw):
subject, buffer = [object.__getattribute__(self, x)
for x in ('_subject', '_buffer')]
result = subject(*args, **kw)
if type(result) not in ReplayableSession.Natives:
buffer.append(ReplayableSession.Callable)
return type(self)(buffer, result)
else:
buffer.append(result)
return result
@property
def _sqla_unwrap(self):
return self._subject
def __getattribute__(self, key):
try:
return object.__getattribute__(self, key)
except AttributeError:
pass
subject, buffer = [object.__getattribute__(self, x)
for x in ('_subject', '_buffer')]
try:
result = type(subject).__getattribute__(subject, key)
except AttributeError:
buffer.append(ReplayableSession.NoAttribute)
raise
else:
if type(result) not in ReplayableSession.Natives:
buffer.append(ReplayableSession.Callable)
return type(self)(buffer, result)
else:
buffer.append(result)
return result
class Player(object):
def __init__(self, buffer):
self._buffer = buffer
def __call__(self, *args, **kw):
buffer = object.__getattribute__(self, '_buffer')
result = buffer.popleft()
if result is ReplayableSession.Callable:
return self
else:
return result
@property
def _sqla_unwrap(self):
return None
def __getattribute__(self, key):
try:
return object.__getattribute__(self, key)
except AttributeError:
pass
buffer = object.__getattribute__(self, '_buffer')
result = buffer.popleft()
if result is ReplayableSession.Callable:
return self
elif result is ReplayableSession.NoAttribute:
raise AttributeError(key)
else:
return result
|