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import gc
import inspect
import os
import sys
import unittest
from io import StringIO
from pympler.garbagegraph import GarbageGraph, start_debug_garbage, end_debug_garbage
from pympler.refgraph import _Edge
class Foo:
def __init__(self):
self.foo = 'foo'
class Bar(Foo):
def __init__(self):
Foo.__init__(self)
self.bar = 'bar'
class FooNew(object):
def __init__(self):
self.foo = 'foo'
class BarNew(FooNew):
def __init__(self):
super(BarNew, self).__init__()
class Enemy(object):
def __del__(self):
pass
class GarbageTestCase(unittest.TestCase):
def setUp(self):
start_debug_garbage()
gc.set_debug(gc.DEBUG_SAVEALL)
def tearDown(self):
end_debug_garbage()
del gc.garbage[:]
def test_empty(self):
"""Test empty garbage graph.
"""
gb = GarbageGraph()
self.assertEqual(gb.count, 0)
self.assertEqual(gb.render('garbage.eps'), False)
def test_findgarbage(self):
"""Test garbage annotation.
"""
foo = Foo()
bar = Bar()
idfoo = id(foo)
idbar = id(bar)
foo.next = bar
bar.prev = foo
del foo
del bar
gb = GarbageGraph()
self.assertEqual(gb.count, len(gc.garbage))
self.assertTrue(gb.count >= 2, gb.count)
gfoo = [x for x in gb.metadata if x.id == idfoo]
self.assertEqual(len(gfoo), 1)
gfoo = gfoo[0]
self.assertEqual(gfoo.type, 'Foo')
self.assertTrue(gfoo.size > 0, gfoo.size)
self.assertNotEqual(gfoo.str, '')
gbar = [x for x in gb.metadata if x.id == idbar]
self.assertEqual(len(gbar), 1)
gbar = gbar[0]
self.assertEqual(gbar.type, 'Bar')
self.assertTrue(gbar.size > 0, gbar.size)
self.assertNotEqual(gbar.str, '')
def test_split(self):
"""Test splitting into subgraphs.
"""
foo = Foo()
bar = Bar()
idfoo = id(foo)
idbar = id(bar)
idfd = id(foo.__dict__)
idbd = id(bar.__dict__)
foo.next = bar
bar.prev = foo
l = []
l.append(l)
idl = id(l)
del foo
del bar
del l
gb = GarbageGraph()
subs = gb.split_and_sort()
self.assertEqual(len(subs), 2)
self.assertEqual(subs[0].count, 4)
self.assertEqual(subs[1].count, 1)
fbg, lig = subs
self.assertTrue(isinstance(fbg, GarbageGraph))
self.assertTrue(isinstance(lig, GarbageGraph))
self.assertEqual(len(fbg.edges), 4, fbg.edges)
self.assertEqual(len(lig.edges), 1, lig.edges)
self.assertTrue(_Edge(idl, idl, '') in lig.edges, lig.edges)
self.assertTrue(_Edge(idfoo, idfd, '__dict__') in fbg.edges, fbg.edges)
self.assertTrue(_Edge(idfd, idbar, 'next') in fbg.edges, fbg.edges)
self.assertTrue(_Edge(idbar, idbd, '__dict__') in fbg.edges, fbg.edges)
self.assertTrue(_Edge(idbd, idfoo, 'prev') in fbg.edges, fbg.edges)
def test_prune(self):
"""Test pruning of reference graph.
"""
foo = []
foo.append(foo)
bar = Bar()
foo.append(bar)
idb = id(bar)
del foo
del bar
gb1 = GarbageGraph()
gb2 = GarbageGraph(reduce=True)
self.assertEqual(gb1.count, gb2.count)
self.assertTrue(gb1.count > gb2.num_in_cycles)
# Only foo should be in the cycle
self.assertEqual(gb2.num_in_cycles, 1)
gbar = [x for x in gb1.metadata if x.id == idb]
self.assertEqual(len(gbar), 1)
gbar = [x for x in gb2.metadata if x.id == idb]
self.assertEqual(len(gbar), 0)
def test_edges_old(self):
"""Test referent identification for old-style classes.
"""
foo = Foo()
bar = Bar()
idfoo = id(foo)
idfd = id(foo.__dict__)
idbar = id(bar)
idbd = id(bar.__dict__)
foo.next = bar
bar.prev = foo
del foo
del bar
gb = GarbageGraph()
self.assertTrue(_Edge(idfoo, idfd, '__dict__') in gb.edges, gb.edges)
self.assertTrue(_Edge(idfd, idbar, 'next') in gb.edges, gb.edges)
self.assertTrue(_Edge(idbar, idbd, '__dict__') in gb.edges, gb.edges)
self.assertTrue(_Edge(idbd, idfoo, 'prev') in gb.edges, gb.edges)
def test_edges_new(self):
"""Test referent identification for new-style classes.
"""
foo = FooNew()
bar = BarNew()
idfoo = id(foo)
idfd = id(foo.__dict__)
idbar = id(bar)
idbd = id(bar.__dict__)
foo.next = bar
bar.prev = foo
del foo
del bar
gb = GarbageGraph()
self.assertTrue(_Edge(idfoo, idfd, '__dict__') in gb.edges, gb.edges)
self.assertTrue(_Edge(idfd, idbar, 'next') in gb.edges, gb.edges)
self.assertTrue(_Edge(idbar, idbd, '__dict__') in gb.edges, gb.edges)
self.assertTrue(_Edge(idbd, idfoo, 'prev') in gb.edges, gb.edges)
def test_uncollectable(self):
"""Test uncollectable object tracking.
This is fixed in Python 3.4 (PEP 442).
"""
foo = Foo()
foo.parent = foo
enemy = Enemy()
enemy.parent = enemy
idfoo = id(foo)
idenemy = id(enemy)
del foo
del enemy
gb = GarbageGraph(collectable=0)
gfoo = [x for x in gb.metadata if x.id == idfoo]
self.assertEqual(len(gfoo), 0)
genemy = [x for x in gb.metadata if x.id == idenemy]
if sys.version_info < (3, 4):
self.assertEqual(len(genemy), 1)
self.assertEqual(gb.reduce_to_cycles(), None)
def test_write_graph(self):
"""Test writing graph as text.
"""
foo = Foo()
foo.parent = foo
del foo
g = GarbageGraph()
g.write_graph('garbage.dot')
os.unlink('garbage.dot')
def test_print_graph(self):
"""Test writing graph as text.
"""
foo = Foo()
foo.parent = foo
del foo
out = StringIO()
GarbageGraph(reduce=True).print_stats(stream=out)
self.assertTrue('Foo' in out.getvalue(), out.getvalue())
def test_render(self):
"""Test rendering of graph.
"""
foo = Foo()
foo.parent = foo
foo.constructor = foo.__init__
def leak_frame():
frame = inspect.currentframe()
leak_frame()
del foo
g = GarbageGraph()
try:
g.render('garbage.eps')
g.render('garbage.eps', unflatten=True)
except OSError:
# Graphviz not installed.
pass
else:
os.unlink('garbage.eps')
if __name__ == "__main__":
suite = unittest.TestSuite()
tclasses = [GarbageTestCase]
for tclass in tclasses:
names = unittest.getTestCaseNames(tclass, 'test_')
suite.addTests(map(tclass, names))
if not unittest.TextTestRunner().run(suite).wasSuccessful():
sys.exit(1)
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