/usr/lib/python2.7/dist-packages/sqlalchemy/testing/util.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 | from ..util import jython, pypy, defaultdict, decorator
import decimal
import gc
import time
import random
import sys
import types
if jython:
def jython_gc_collect(*args):
"""aggressive gc.collect for tests."""
gc.collect()
time.sleep(0.1)
gc.collect()
gc.collect()
return 0
# "lazy" gc, for VM's that don't GC on refcount == 0
gc_collect = lazy_gc = jython_gc_collect
elif pypy:
def pypy_gc_collect(*args):
gc.collect()
gc.collect()
gc_collect = lazy_gc = pypy_gc_collect
else:
# assume CPython - straight gc.collect, lazy_gc() is a pass
gc_collect = gc.collect
def lazy_gc():
pass
def picklers():
picklers = set()
# Py2K
try:
import cPickle
picklers.add(cPickle)
except ImportError:
pass
# end Py2K
import pickle
picklers.add(pickle)
# yes, this thing needs this much testing
for pickle_ in picklers:
for protocol in -1, 0, 1, 2:
yield pickle_.loads, lambda d: pickle_.dumps(d, protocol)
def round_decimal(value, prec):
if isinstance(value, float):
return round(value, prec)
# can also use shift() here but that is 2.6 only
return (value * decimal.Decimal("1" + "0" * prec)
).to_integral(decimal.ROUND_FLOOR) / \
pow(10, prec)
class RandomSet(set):
def __iter__(self):
l = list(set.__iter__(self))
random.shuffle(l)
return iter(l)
def pop(self):
index = random.randint(0, len(self) - 1)
item = list(set.__iter__(self))[index]
self.remove(item)
return item
def union(self, other):
return RandomSet(set.union(self, other))
def difference(self, other):
return RandomSet(set.difference(self, other))
def intersection(self, other):
return RandomSet(set.intersection(self, other))
def copy(self):
return RandomSet(self)
def conforms_partial_ordering(tuples, sorted_elements):
"""True if the given sorting conforms to the given partial ordering."""
deps = defaultdict(set)
for parent, child in tuples:
deps[parent].add(child)
for i, node in enumerate(sorted_elements):
for n in sorted_elements[i:]:
if node in deps[n]:
return False
else:
return True
def all_partial_orderings(tuples, elements):
edges = defaultdict(set)
for parent, child in tuples:
edges[child].add(parent)
def _all_orderings(elements):
if len(elements) == 1:
yield list(elements)
else:
for elem in elements:
subset = set(elements).difference([elem])
if not subset.intersection(edges[elem]):
for sub_ordering in _all_orderings(subset):
yield [elem] + sub_ordering
return iter(_all_orderings(elements))
def function_named(fn, name):
"""Return a function with a given __name__.
Will assign to __name__ and return the original function if possible on
the Python implementation, otherwise a new function will be constructed.
This function should be phased out as much as possible
in favor of @decorator. Tests that "generate" many named tests
should be modernized.
"""
try:
fn.__name__ = name
except TypeError:
fn = types.FunctionType(fn.func_code, fn.func_globals, name,
fn.func_defaults, fn.func_closure)
return fn
def run_as_contextmanager(ctx, fn, *arg, **kw):
"""Run the given function under the given contextmanager,
simulating the behavior of 'with' to support older
Python versions.
"""
obj = ctx.__enter__()
try:
result = fn(obj, *arg, **kw)
ctx.__exit__(None, None, None)
return result
except:
exc_info = sys.exc_info()
raise_ = ctx.__exit__(*exc_info)
if raise_ is None:
raise
else:
return raise_
def rowset(results):
"""Converts the results of sql execution into a plain set of column tuples.
Useful for asserting the results of an unordered query.
"""
return set([tuple(row) for row in results])
def fail(msg):
assert False, msg
@decorator
def provide_metadata(fn, *args, **kw):
"""Provide bound MetaData for a single test, dropping afterwards."""
from . import config
from sqlalchemy import schema
metadata = schema.MetaData(config.db)
self = args[0]
prev_meta = getattr(self, 'metadata', None)
self.metadata = metadata
try:
return fn(*args, **kw)
finally:
metadata.drop_all()
self.metadata = prev_meta
class adict(dict):
"""Dict keys available as attributes. Shadows."""
def __getattribute__(self, key):
try:
return self[key]
except KeyError:
return dict.__getattribute__(self, key)
def get_all(self, *keys):
return tuple([self[key] for key in keys])
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