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import os
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import sys
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import tempfile
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import shutil
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import random
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import time
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from StringIO import StringIO
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import nose.tools as nt
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import IPython.testing.tools as tt
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from IPython.extensions.autoreload import AutoreloadInterface
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from IPython.core.hooks import TryNext
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#-----------------------------------------------------------------------------
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# Test fixture
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#-----------------------------------------------------------------------------
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class FakeShell(object):
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def __init__(self):
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self.ns = {}
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self.reloader = AutoreloadInterface()
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def run_code(self, code):
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try:
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self.reloader.pre_run_code_hook(self)
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except TryNext:
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pass
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exec code in self.ns
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def push(self, items):
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self.ns.update(items)
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def magic_autoreload(self, parameter):
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self.reloader.magic_autoreload(self, parameter)
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def magic_aimport(self, parameter, stream=None):
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self.reloader.magic_aimport(self, parameter, stream=stream)
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class Fixture(object):
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"""Fixture for creating test module files"""
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test_dir = None
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old_sys_path = None
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filename_chars = "abcdefghijklmopqrstuvwxyz0123456789"
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def setUp(self):
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self.test_dir = tempfile.mkdtemp()
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self.old_sys_path = list(sys.path)
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sys.path.insert(0, self.test_dir)
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self.shell = FakeShell()
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def tearDown(self):
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shutil.rmtree(self.test_dir)
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sys.path = self.old_sys_path
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self.shell.reloader.enabled = False
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self.test_dir = None
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self.old_sys_path = None
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self.shell = None
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def get_module(self):
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module_name = "tmpmod_" + "".join(random.sample(self.filename_chars,20))
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if module_name in sys.modules:
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del sys.modules[module_name]
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file_name = os.path.join(self.test_dir, module_name + ".py")
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return module_name, file_name
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def write_file(self, filename, content):
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"""
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Write a file, and force a timestamp difference of at least one second
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Notes
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-----
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Python's .pyc files record the timestamp of their compilation
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with a time resolution of one second.
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Therefore, we need to force a timestamp difference between .py
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and .pyc, without having the .py file be timestamped in the
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future, and without changing the timestamp of the .pyc file
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(because that is stored in the file). The only reliable way
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to achieve this seems to be to sleep.
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"""
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# Sleep one second + eps
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time.sleep(1.05)
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# Write
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f = open(filename, 'w')
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try:
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f.write(content)
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finally:
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f.close()
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def new_module(self, code):
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mod_name, mod_fn = self.get_module()
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f = open(mod_fn, 'w')
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try:
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f.write(code)
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finally:
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f.close()
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return mod_name, mod_fn
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#-----------------------------------------------------------------------------
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# Test automatic reloading
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#-----------------------------------------------------------------------------
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class TestAutoreload(Fixture):
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def _check_smoketest(self, use_aimport=True):
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"""
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Functional test for the automatic reloader using either
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'%autoreload 1' or '%autoreload 2'
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"""
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mod_name, mod_fn = self.new_module("""
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x = 9
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z = 123 # this item will be deleted
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def foo(y):
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return y + 3
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class Baz(object):
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def __init__(self, x):
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self.x = x
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def bar(self, y):
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return self.x + y
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@property
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def quux(self):
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return 42
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def zzz(self):
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'''This method will be deleted below'''
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return 99
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class Bar: # old-style class: weakref doesn't work for it on Python < 2.7
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def foo(self):
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return 1
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""")
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#
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# Import module, and mark for reloading
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#
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if use_aimport:
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self.shell.magic_autoreload("1")
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self.shell.magic_aimport(mod_name)
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stream = StringIO()
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self.shell.magic_aimport("", stream=stream)
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nt.assert_true(("Modules to reload:\n%s" % mod_name) in
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stream.getvalue())
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nt.assert_raises(
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ImportError,
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self.shell.magic_aimport, "tmpmod_as318989e89ds")
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else:
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self.shell.magic_autoreload("2")
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self.shell.run_code("import %s" % mod_name)
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stream = StringIO()
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self.shell.magic_aimport("", stream=stream)
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nt.assert_true("Modules to reload:\nall-except-skipped" in
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stream.getvalue())
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nt.assert_true(mod_name in self.shell.ns)
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mod = sys.modules[mod_name]
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#
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# Test module contents
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#
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old_foo = mod.foo
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old_obj = mod.Baz(9)
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old_obj2 = mod.Bar()
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def check_module_contents():
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nt.assert_equal(mod.x, 9)
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nt.assert_equal(mod.z, 123)
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nt.assert_equal(old_foo(0), 3)
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nt.assert_equal(mod.foo(0), 3)
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obj = mod.Baz(9)
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nt.assert_equal(old_obj.bar(1), 10)
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nt.assert_equal(obj.bar(1), 10)
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nt.assert_equal(obj.quux, 42)
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nt.assert_equal(obj.zzz(), 99)
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obj2 = mod.Bar()
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nt.assert_equal(old_obj2.foo(), 1)
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nt.assert_equal(obj2.foo(), 1)
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check_module_contents()
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#
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# Simulate a failed reload: no reload should occur and exactly
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# one error message should be printed
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#
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self.write_file(mod_fn, """
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a syntax error
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""")
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with tt.AssertPrints(('[autoreload of %s failed:' % mod_name), channel='stderr'):
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self.shell.run_code("pass") # trigger reload
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with tt.AssertNotPrints(('[autoreload of %s failed:' % mod_name), channel='stderr'):
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self.shell.run_code("pass") # trigger another reload
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check_module_contents()
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#
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# Rewrite module (this time reload should succeed)
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#
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self.write_file(mod_fn, """
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x = 10
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def foo(y):
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return y + 4
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class Baz(object):
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def __init__(self, x):
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self.x = x
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def bar(self, y):
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return self.x + y + 1
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@property
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def quux(self):
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return 43
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class Bar: # old-style class
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def foo(self):
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return 2
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""")
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def check_module_contents():
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nt.assert_equal(mod.x, 10)
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nt.assert_false(hasattr(mod, 'z'))
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nt.assert_equal(old_foo(0), 4) # superreload magic!
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nt.assert_equal(mod.foo(0), 4)
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obj = mod.Baz(9)
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nt.assert_equal(old_obj.bar(1), 11) # superreload magic!
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nt.assert_equal(obj.bar(1), 11)
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nt.assert_equal(old_obj.quux, 43)
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nt.assert_equal(obj.quux, 43)
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nt.assert_false(hasattr(old_obj, 'zzz'))
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nt.assert_false(hasattr(obj, 'zzz'))
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obj2 = mod.Bar()
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nt.assert_equal(old_obj2.foo(), 2)
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nt.assert_equal(obj2.foo(), 2)
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self.shell.run_code("pass") # trigger reload
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check_module_contents()
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#
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# Another failure case: deleted file (shouldn't reload)
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#
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os.unlink(mod_fn)
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self.shell.run_code("pass") # trigger reload
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check_module_contents()
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#
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# Disable autoreload and rewrite module: no reload should occur
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#
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if use_aimport:
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self.shell.magic_aimport("-" + mod_name)
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stream = StringIO()
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self.shell.magic_aimport("", stream=stream)
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nt.assert_true(("Modules to skip:\n%s" % mod_name) in
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stream.getvalue())
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# This should succeed, although no such module exists
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self.shell.magic_aimport("-tmpmod_as318989e89ds")
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else:
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self.shell.magic_autoreload("0")
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self.write_file(mod_fn, """
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x = -99
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""")
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self.shell.run_code("pass") # trigger reload
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self.shell.run_code("pass")
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check_module_contents()
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#
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# Re-enable autoreload: reload should now occur
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#
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if use_aimport:
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self.shell.magic_aimport(mod_name)
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else:
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self.shell.magic_autoreload("")
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self.shell.run_code("pass") # trigger reload
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nt.assert_equal(mod.x, -99)
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def test_smoketest_aimport(self):
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self._check_smoketest(use_aimport=True)
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def test_smoketest_autoreload(self):
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self._check_smoketest(use_aimport=False)
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