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# testing/exclusions.py
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""NOTE: copied/adapted from SQLAlchemy master for backwards compatibility;
this should be removable when Alembic targets SQLAlchemy 1.0.0
"""
import operator
from .plugin.plugin_base import SkipTest
from sqlalchemy.util import decorator
from . import config
from sqlalchemy import util
from ..util import compat
import inspect
import contextlib
from .compat import get_url_driver_name, get_url_backend_name
def skip_if(predicate, reason=None):
rule = compound()
pred = _as_predicate(predicate, reason)
rule.skips.add(pred)
return rule
def fails_if(predicate, reason=None):
rule = compound()
pred = _as_predicate(predicate, reason)
rule.fails.add(pred)
return rule
class compound(object):
def __init__(self):
self.fails = set()
self.skips = set()
self.tags = set()
def __add__(self, other):
return self.add(other)
def add(self, *others):
copy = compound()
copy.fails.update(self.fails)
copy.skips.update(self.skips)
copy.tags.update(self.tags)
for other in others:
copy.fails.update(other.fails)
copy.skips.update(other.skips)
copy.tags.update(other.tags)
return copy
def not_(self):
copy = compound()
copy.fails.update(NotPredicate(fail) for fail in self.fails)
copy.skips.update(NotPredicate(skip) for skip in self.skips)
copy.tags.update(self.tags)
return copy
@property
def enabled(self):
return self.enabled_for_config(config._current)
def enabled_for_config(self, config):
for predicate in self.skips.union(self.fails):
if predicate(config):
return False
else:
return True
def matching_config_reasons(self, config):
return [
predicate._as_string(config) for predicate
in self.skips.union(self.fails)
if predicate(config)
]
def include_test(self, include_tags, exclude_tags):
return bool(
not self.tags.intersection(exclude_tags) and
(not include_tags or self.tags.intersection(include_tags))
)
def _extend(self, other):
self.skips.update(other.skips)
self.fails.update(other.fails)
self.tags.update(other.tags)
def __call__(self, fn):
if hasattr(fn, '_sa_exclusion_extend'):
fn._sa_exclusion_extend._extend(self)
return fn
@decorator
def decorate(fn, *args, **kw):
return self._do(config._current, fn, *args, **kw)
decorated = decorate(fn)
decorated._sa_exclusion_extend = self
return decorated
@contextlib.contextmanager
def fail_if(self):
all_fails = compound()
all_fails.fails.update(self.skips.union(self.fails))
try:
yield
except Exception as ex:
all_fails._expect_failure(config._current, ex)
else:
all_fails._expect_success(config._current)
def _do(self, config, fn, *args, **kw):
for skip in self.skips:
if skip(config):
msg = "'%s' : %s" % (
fn.__name__,
skip._as_string(config)
)
raise SkipTest(msg)
try:
return_value = fn(*args, **kw)
except Exception as ex:
self._expect_failure(config, ex, name=fn.__name__)
else:
self._expect_success(config, name=fn.__name__)
return return_value
def _expect_failure(self, config, ex, name='block'):
for fail in self.fails:
if fail(config):
print(("%s failed as expected (%s): %s " % (
name, fail._as_string(config), str(ex))))
break
else:
compat.raise_from_cause(ex)
def _expect_success(self, config, name='block'):
if not self.fails:
return
for fail in self.fails:
if not fail(config):
break
else:
raise AssertionError(
"Unexpected success for '%s' (%s)" %
(
name,
" and ".join(
fail._as_string(config)
for fail in self.fails
)
)
)
def requires_tag(tagname):
return tags([tagname])
def tags(tagnames):
comp = compound()
comp.tags.update(tagnames)
return comp
def only_if(predicate, reason=None):
predicate = _as_predicate(predicate)
return skip_if(NotPredicate(predicate), reason)
def succeeds_if(predicate, reason=None):
predicate = _as_predicate(predicate)
return fails_if(NotPredicate(predicate), reason)
class Predicate(object):
@classmethod
def as_predicate(cls, predicate, description=None):
if isinstance(predicate, compound):
return cls.as_predicate(predicate.fails.union(predicate.skips))
elif isinstance(predicate, Predicate):
if description and predicate.description is None:
predicate.description = description
return predicate
elif isinstance(predicate, (list, set)):
return OrPredicate(
[cls.as_predicate(pred) for pred in predicate],
description)
elif isinstance(predicate, tuple):
return SpecPredicate(*predicate)
elif isinstance(predicate, compat.string_types):
tokens = predicate.split(" ", 2)
op = spec = None
db = tokens.pop(0)
if tokens:
op = tokens.pop(0)
if tokens:
spec = tuple(int(d) for d in tokens.pop(0).split("."))
return SpecPredicate(db, op, spec, description=description)
elif util.callable(predicate):
return LambdaPredicate(predicate, description)
else:
assert False, "unknown predicate type: %s" % predicate
def _format_description(self, config, negate=False):
bool_ = self(config)
if negate:
bool_ = not negate
return self.description % {
"driver": get_url_driver_name(config.db.url),
"database": get_url_backend_name(config.db.url),
"doesnt_support": "doesn't support" if bool_ else "does support",
"does_support": "does support" if bool_ else "doesn't support"
}
def _as_string(self, config=None, negate=False):
raise NotImplementedError()
class BooleanPredicate(Predicate):
def __init__(self, value, description=None):
self.value = value
self.description = description or "boolean %s" % value
def __call__(self, config):
return self.value
def _as_string(self, config, negate=False):
return self._format_description(config, negate=negate)
class SpecPredicate(Predicate):
def __init__(self, db, op=None, spec=None, description=None):
self.db = db
self.op = op
self.spec = spec
self.description = description
_ops = {
'<': operator.lt,
'>': operator.gt,
'==': operator.eq,
'!=': operator.ne,
'<=': operator.le,
'>=': operator.ge,
'in': operator.contains,
'between': lambda val, pair: val >= pair[0] and val <= pair[1],
}
def __call__(self, config):
engine = config.db
if "+" in self.db:
dialect, driver = self.db.split('+')
else:
dialect, driver = self.db, None
if dialect and engine.name != dialect:
return False
if driver is not None and engine.driver != driver:
return False
if self.op is not None:
assert driver is None, "DBAPI version specs not supported yet"
version = _server_version(engine)
oper = hasattr(self.op, '__call__') and self.op \
or self._ops[self.op]
return oper(version, self.spec)
else:
return True
def _as_string(self, config, negate=False):
if self.description is not None:
return self._format_description(config)
elif self.op is None:
if negate:
return "not %s" % self.db
else:
return "%s" % self.db
else:
if negate:
return "not %s %s %s" % (
self.db,
self.op,
self.spec
)
else:
return "%s %s %s" % (
self.db,
self.op,
self.spec
)
class LambdaPredicate(Predicate):
def __init__(self, lambda_, description=None, args=None, kw=None):
spec = inspect.getargspec(lambda_)
if not spec[0]:
self.lambda_ = lambda db: lambda_()
else:
self.lambda_ = lambda_
self.args = args or ()
self.kw = kw or {}
if description:
self.description = description
elif lambda_.__doc__:
self.description = lambda_.__doc__
else:
self.description = "custom function"
def __call__(self, config):
return self.lambda_(config)
def _as_string(self, config, negate=False):
return self._format_description(config)
class NotPredicate(Predicate):
def __init__(self, predicate, description=None):
self.predicate = predicate
self.description = description
def __call__(self, config):
return not self.predicate(config)
def _as_string(self, config, negate=False):
if self.description:
return self._format_description(config, not negate)
else:
return self.predicate._as_string(config, not negate)
class OrPredicate(Predicate):
def __init__(self, predicates, description=None):
self.predicates = predicates
self.description = description
def __call__(self, config):
for pred in self.predicates:
if pred(config):
return True
return False
def _eval_str(self, config, negate=False):
if negate:
conjunction = " and "
else:
conjunction = " or "
return conjunction.join(p._as_string(config, negate=negate)
for p in self.predicates)
def _negation_str(self, config):
if self.description is not None:
return "Not " + self._format_description(config)
else:
return self._eval_str(config, negate=True)
def _as_string(self, config, negate=False):
if negate:
return self._negation_str(config)
else:
if self.description is not None:
return self._format_description(config)
else:
return self._eval_str(config)
_as_predicate = Predicate.as_predicate
def _is_excluded(db, op, spec):
return SpecPredicate(db, op, spec)(config._current)
def _server_version(engine):
"""Return a server_version_info tuple."""
# force metadata to be retrieved
conn = engine.connect()
version = getattr(engine.dialect, 'server_version_info', ())
conn.close()
return version
def db_spec(*dbs):
return OrPredicate(
[Predicate.as_predicate(db) for db in dbs]
)
def open():
return skip_if(BooleanPredicate(False, "mark as execute"))
def closed():
return skip_if(BooleanPredicate(True, "marked as skip"))
def fails():
return fails_if(BooleanPredicate(True, "expected to fail"))
@decorator
def future(fn, *arg):
return fails_if(LambdaPredicate(fn), "Future feature")
def fails_on(db, reason=None):
return fails_if(SpecPredicate(db), reason)
def fails_on_everything_except(*dbs):
return succeeds_if(
OrPredicate([
SpecPredicate(db) for db in dbs
])
)
def skip(db, reason=None):
return skip_if(SpecPredicate(db), reason)
def only_on(dbs, reason=None):
return only_if(
OrPredicate([SpecPredicate(db) for db in util.to_list(dbs)])
)
def exclude(db, op, spec, reason=None):
return skip_if(SpecPredicate(db, op, spec), reason)
def against(config, *queries):
assert queries, "no queries sent!"
return OrPredicate([
Predicate.as_predicate(query)
for query in queries
])(config)
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