Update 2025-04-13_16:25:39
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# testing/exclusions.py
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# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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# mypy: ignore-errors
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import contextlib
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import operator
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import re
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import sys
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from . import config
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from .. import util
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from ..util import decorator
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from ..util.compat import inspect_getfullargspec
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def skip_if(predicate, reason=None):
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rule = compound()
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pred = _as_predicate(predicate, reason)
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rule.skips.add(pred)
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return rule
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def fails_if(predicate, reason=None):
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rule = compound()
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pred = _as_predicate(predicate, reason)
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rule.fails.add(pred)
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return rule
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class compound:
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def __init__(self):
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self.fails = set()
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self.skips = set()
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def __add__(self, other):
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return self.add(other)
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def as_skips(self):
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rule = compound()
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rule.skips.update(self.skips)
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rule.skips.update(self.fails)
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return rule
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def add(self, *others):
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copy = compound()
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copy.fails.update(self.fails)
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copy.skips.update(self.skips)
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for other in others:
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copy.fails.update(other.fails)
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copy.skips.update(other.skips)
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return copy
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def not_(self):
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copy = compound()
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copy.fails.update(NotPredicate(fail) for fail in self.fails)
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copy.skips.update(NotPredicate(skip) for skip in self.skips)
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return copy
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@property
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def enabled(self):
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return self.enabled_for_config(config._current)
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def enabled_for_config(self, config):
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for predicate in self.skips.union(self.fails):
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if predicate(config):
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return False
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else:
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return True
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def matching_config_reasons(self, config):
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return [
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predicate._as_string(config)
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for predicate in self.skips.union(self.fails)
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if predicate(config)
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]
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def _extend(self, other):
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self.skips.update(other.skips)
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self.fails.update(other.fails)
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def __call__(self, fn):
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if hasattr(fn, "_sa_exclusion_extend"):
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fn._sa_exclusion_extend._extend(self)
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return fn
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@decorator
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def decorate(fn, *args, **kw):
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return self._do(config._current, fn, *args, **kw)
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decorated = decorate(fn)
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decorated._sa_exclusion_extend = self
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return decorated
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@contextlib.contextmanager
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def fail_if(self):
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all_fails = compound()
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all_fails.fails.update(self.skips.union(self.fails))
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try:
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yield
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except Exception as ex:
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all_fails._expect_failure(config._current, ex)
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else:
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all_fails._expect_success(config._current)
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def _do(self, cfg, fn, *args, **kw):
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for skip in self.skips:
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if skip(cfg):
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msg = "'%s' : %s" % (
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config.get_current_test_name(),
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skip._as_string(cfg),
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)
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config.skip_test(msg)
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try:
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return_value = fn(*args, **kw)
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except Exception as ex:
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self._expect_failure(cfg, ex, name=fn.__name__)
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else:
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self._expect_success(cfg, name=fn.__name__)
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return return_value
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def _expect_failure(self, config, ex, name="block"):
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for fail in self.fails:
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if fail(config):
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print(
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"%s failed as expected (%s): %s "
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% (name, fail._as_string(config), ex)
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)
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break
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else:
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raise ex.with_traceback(sys.exc_info()[2])
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def _expect_success(self, config, name="block"):
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if not self.fails:
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return
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for fail in self.fails:
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if fail(config):
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raise AssertionError(
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"Unexpected success for '%s' (%s)"
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% (
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name,
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" and ".join(
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fail._as_string(config) for fail in self.fails
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),
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)
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)
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def only_if(predicate, reason=None):
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predicate = _as_predicate(predicate)
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return skip_if(NotPredicate(predicate), reason)
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def succeeds_if(predicate, reason=None):
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predicate = _as_predicate(predicate)
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return fails_if(NotPredicate(predicate), reason)
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class Predicate:
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@classmethod
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def as_predicate(cls, predicate, description=None):
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if isinstance(predicate, compound):
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return cls.as_predicate(predicate.enabled_for_config, description)
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elif isinstance(predicate, Predicate):
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if description and predicate.description is None:
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predicate.description = description
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return predicate
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elif isinstance(predicate, (list, set)):
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return OrPredicate(
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[cls.as_predicate(pred) for pred in predicate], description
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)
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elif isinstance(predicate, tuple):
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return SpecPredicate(*predicate)
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elif isinstance(predicate, str):
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tokens = re.match(
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r"([\+\w]+)\s*(?:(>=|==|!=|<=|<|>)\s*([\d\.]+))?", predicate
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)
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if not tokens:
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raise ValueError(
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"Couldn't locate DB name in predicate: %r" % predicate
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)
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db = tokens.group(1)
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op = tokens.group(2)
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spec = (
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tuple(int(d) for d in tokens.group(3).split("."))
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if tokens.group(3)
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else None
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)
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return SpecPredicate(db, op, spec, description=description)
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elif callable(predicate):
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return LambdaPredicate(predicate, description)
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else:
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assert False, "unknown predicate type: %s" % predicate
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def _format_description(self, config, negate=False):
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bool_ = self(config)
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if negate:
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bool_ = not negate
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return self.description % {
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"driver": (
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config.db.url.get_driver_name() if config else "<no driver>"
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),
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"database": (
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config.db.url.get_backend_name() if config else "<no database>"
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),
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"doesnt_support": "doesn't support" if bool_ else "does support",
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"does_support": "does support" if bool_ else "doesn't support",
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}
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def _as_string(self, config=None, negate=False):
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raise NotImplementedError()
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class BooleanPredicate(Predicate):
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def __init__(self, value, description=None):
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self.value = value
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self.description = description or "boolean %s" % value
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def __call__(self, config):
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return self.value
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def _as_string(self, config, negate=False):
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return self._format_description(config, negate=negate)
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class SpecPredicate(Predicate):
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def __init__(self, db, op=None, spec=None, description=None):
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self.db = db
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self.op = op
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self.spec = spec
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self.description = description
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_ops = {
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"<": operator.lt,
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">": operator.gt,
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"==": operator.eq,
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"!=": operator.ne,
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"<=": operator.le,
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">=": operator.ge,
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"in": operator.contains,
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"between": lambda val, pair: val >= pair[0] and val <= pair[1],
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}
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def __call__(self, config):
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if config is None:
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return False
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engine = config.db
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if "+" in self.db:
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dialect, driver = self.db.split("+")
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else:
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dialect, driver = self.db, None
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if dialect and engine.name != dialect:
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return False
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if driver is not None and engine.driver != driver:
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return False
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if self.op is not None:
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assert driver is None, "DBAPI version specs not supported yet"
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version = _server_version(engine)
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oper = (
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hasattr(self.op, "__call__") and self.op or self._ops[self.op]
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)
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return oper(version, self.spec)
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else:
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return True
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def _as_string(self, config, negate=False):
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if self.description is not None:
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return self._format_description(config)
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elif self.op is None:
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if negate:
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return "not %s" % self.db
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else:
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return "%s" % self.db
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else:
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if negate:
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return "not %s %s %s" % (self.db, self.op, self.spec)
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else:
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return "%s %s %s" % (self.db, self.op, self.spec)
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class LambdaPredicate(Predicate):
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def __init__(self, lambda_, description=None, args=None, kw=None):
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spec = inspect_getfullargspec(lambda_)
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if not spec[0]:
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self.lambda_ = lambda db: lambda_()
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else:
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self.lambda_ = lambda_
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self.args = args or ()
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self.kw = kw or {}
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if description:
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self.description = description
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elif lambda_.__doc__:
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self.description = lambda_.__doc__
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else:
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self.description = "custom function"
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def __call__(self, config):
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return self.lambda_(config)
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def _as_string(self, config, negate=False):
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return self._format_description(config)
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class NotPredicate(Predicate):
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def __init__(self, predicate, description=None):
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self.predicate = predicate
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self.description = description
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def __call__(self, config):
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return not self.predicate(config)
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def _as_string(self, config, negate=False):
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if self.description:
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return self._format_description(config, not negate)
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else:
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return self.predicate._as_string(config, not negate)
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class OrPredicate(Predicate):
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def __init__(self, predicates, description=None):
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self.predicates = predicates
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self.description = description
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def __call__(self, config):
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for pred in self.predicates:
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if pred(config):
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return True
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return False
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def _eval_str(self, config, negate=False):
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if negate:
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conjunction = " and "
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else:
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conjunction = " or "
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return conjunction.join(
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p._as_string(config, negate=negate) for p in self.predicates
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)
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def _negation_str(self, config):
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if self.description is not None:
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return "Not " + self._format_description(config)
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else:
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return self._eval_str(config, negate=True)
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def _as_string(self, config, negate=False):
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if negate:
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return self._negation_str(config)
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else:
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if self.description is not None:
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return self._format_description(config)
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else:
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return self._eval_str(config)
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_as_predicate = Predicate.as_predicate
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def _is_excluded(db, op, spec):
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return SpecPredicate(db, op, spec)(config._current)
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def _server_version(engine):
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"""Return a server_version_info tuple."""
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# force metadata to be retrieved
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conn = engine.connect()
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version = getattr(engine.dialect, "server_version_info", None)
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if version is None:
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version = ()
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conn.close()
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return version
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def db_spec(*dbs):
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return OrPredicate([Predicate.as_predicate(db) for db in dbs])
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def open(): # noqa
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return skip_if(BooleanPredicate(False, "mark as execute"))
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def closed():
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return skip_if(BooleanPredicate(True, "marked as skip"))
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def fails(reason=None):
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return fails_if(BooleanPredicate(True, reason or "expected to fail"))
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def future():
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return fails_if(BooleanPredicate(True, "Future feature"))
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def fails_on(db, reason=None):
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return fails_if(db, reason)
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def fails_on_everything_except(*dbs):
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return succeeds_if(OrPredicate([Predicate.as_predicate(db) for db in dbs]))
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def skip(db, reason=None):
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return skip_if(db, reason)
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def only_on(dbs, reason=None):
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return only_if(
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OrPredicate(
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[Predicate.as_predicate(db, reason) for db in util.to_list(dbs)]
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)
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)
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def exclude(db, op, spec, reason=None):
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return skip_if(SpecPredicate(db, op, spec), reason)
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def against(config, *queries):
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assert queries, "no queries sent!"
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return OrPredicate([Predicate.as_predicate(query) for query in queries])(
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config
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)
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