forked from celery/celery
/
utils.py
229 lines (162 loc) · 5.08 KB
/
utils.py
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from __future__ import generators
import os
import sys
import __builtin__
from StringIO import StringIO
from nose import SkipTest
from celery.utils.functional import wraps
class GeneratorContextManager(object):
def __init__(self, gen):
self.gen = gen
def __enter__(self):
try:
return self.gen.next()
except StopIteration:
raise RuntimeError("generator didn't yield")
def __exit__(self, type, value, traceback):
if type is None:
try:
self.gen.next()
except StopIteration:
return
else:
raise RuntimeError("generator didn't stop")
else:
try:
self.gen.throw(type, value, traceback)
raise RuntimeError("generator didn't stop after throw()")
except StopIteration:
return True
except AttributeError:
raise value
except:
if sys.exc_info()[1] is not value:
raise
def fallback_contextmanager(fun):
def helper(*args, **kwds):
return GeneratorContextManager(fun(*args, **kwds))
return helper
def execute_context(context, fun):
val = context.__enter__()
exc_info = (None, None, None)
retval = None
try:
retval = fun(val)
except:
exc_info = sys.exc_info()
context.__exit__(*exc_info)
return retval
try:
from contextlib import contextmanager
except ImportError:
contextmanager = fallback_contextmanager
from celery.utils import noop
@contextmanager
def eager_tasks():
from celery import conf
prev = conf.ALWAYS_EAGER
conf.ALWAYS_EAGER = True
yield True
conf.ALWAYS_EAGER = prev
def with_eager_tasks(fun):
@wraps(fun)
def _inner(*args, **kwargs):
from celery import conf
prev = conf.ALWAYS_EAGER
conf.ALWAYS_EAGER = True
try:
return fun(*args, **kwargs)
finally:
conf.ALWAYS_EAGER = prev
def with_environ(env_name, env_value):
def _envpatched(fun):
@wraps(fun)
def _patch_environ(*args, **kwargs):
prev_val = os.environ.get(env_name)
os.environ[env_name] = env_value
try:
return fun(*args, **kwargs)
finally:
if prev_val is not None:
os.environ[env_name] = prev_val
return _patch_environ
return _envpatched
def sleepdeprived(fun):
@wraps(fun)
def _sleepdeprived(*args, **kwargs):
import time
old_sleep = time.sleep
time.sleep = noop
try:
return fun(*args, **kwargs)
finally:
time.sleep = old_sleep
return _sleepdeprived
def skip_if_environ(env_var_name):
def _wrap_test(fun):
@wraps(fun)
def _skips_if_environ(*args, **kwargs):
if os.environ.get(env_var_name):
raise SkipTest("SKIP %s: %s set\n" % (
fun.__name__, env_var_name))
return fun(*args, **kwargs)
return _skips_if_environ
return _wrap_test
def skip_if_quick(fun):
return skip_if_environ("QUICKTEST")(fun)
def _skip_test(reason, sign):
def _wrap_test(fun):
@wraps(fun)
def _skipped_test(*args, **kwargs):
raise SkipTest("%s: %s" % (sign, reason))
return _skipped_test
return _wrap_test
def todo(reason):
"""TODO test decorator."""
return _skip_test(reason, "TODO")
def skip(reason):
"""Skip test decorator."""
return _skip_test(reason, "SKIP")
def skip_if(predicate, reason):
"""Skip test if predicate is ``True``."""
def _inner(fun):
return predicate and skip(reason)(fun) or fun
return _inner
def skip_unless(predicate, reason):
"""Skip test if predicate is ``False``."""
return skip_if(not predicate, reason)
# Taken from
# http://bitbucket.org/runeh/snippets/src/tip/missing_modules.py
@contextmanager
def mask_modules(*modnames):
"""Ban some modules from being importable inside the context
For example:
>>> with missing_modules("sys"):
... try:
... import sys
... except ImportError:
... print "sys not found"
sys not found
>>> import sys
>>> sys.version
(2, 5, 2, 'final', 0)
"""
realimport = __builtin__.__import__
def myimp(name, *args, **kwargs):
if name in modnames:
raise ImportError("No module named %s" % name)
else:
return realimport(name, *args, **kwargs)
__builtin__.__import__ = myimp
yield True
__builtin__.__import__ = realimport
@contextmanager
def override_stdouts():
"""Override ``sys.stdout`` and ``sys.stderr`` with ``StringIO``."""
prev_out, prev_err = sys.stdout, sys.stderr
mystdout, mystderr = StringIO(), StringIO()
sys.stdout = sys.__stdout__ = mystdout
sys.stderr = sys.__stderr__ = mystderr
yield mystdout, mystderr
sys.stdout = sys.__stdout__ = prev_out
sys.stderr = sys.__stderr__ = prev_err