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Mini Shell
Mini Shell
from functools import wraps
import logging
from peewee import create_model_tables
from peewee import drop_model_tables
logger = logging.getLogger('peewee')
class test_database(object):
def __init__(self, db, models, create_tables=True, drop_tables=True,
fail_silently=False):
if not isinstance(models, (list, tuple, set)):
raise ValueError('%r must be a list or tuple.' % models)
self.db = db
self.models = models
self.create_tables = create_tables
self.drop_tables = drop_tables
self.fail_silently = fail_silently
def __enter__(self):
self.orig = []
for m in self.models:
self.orig.append(m._meta.database)
m._meta.database = self.db
if self.create_tables:
create_model_tables(self.models, fail_silently=self.fail_silently)
def __exit__(self, exc_type, exc_val, exc_tb):
if self.create_tables and self.drop_tables:
drop_model_tables(self.models, fail_silently=self.fail_silently)
for i, m in enumerate(self.models):
m._meta.database = self.orig[i]
class _QueryLogHandler(logging.Handler):
def __init__(self, *args, **kwargs):
self.queries = []
logging.Handler.__init__(self, *args, **kwargs)
def emit(self, record):
self.queries.append(record)
class count_queries(object):
def __init__(self, only_select=False):
self.only_select = only_select
self.count = 0
def get_queries(self):
return self._handler.queries
def __enter__(self):
self._handler = _QueryLogHandler()
logger.setLevel(logging.DEBUG)
logger.addHandler(self._handler)
return self
def __exit__(self, exc_type, exc_val, exc_tb):
logger.removeHandler(self._handler)
if self.only_select:
self.count = len([q for q in self._handler.queries
if q.msg[0].startswith('SELECT ')])
else:
self.count = len(self._handler.queries)
class assert_query_count(count_queries):
def __init__(self, expected, only_select=False):
super(assert_query_count, self).__init__(only_select=only_select)
self.expected = expected
def __call__(self, f):
@wraps(f)
def decorated(*args, **kwds):
with self:
ret = f(*args, **kwds)
self._assert_count()
return ret
return decorated
def _assert_count(self):
error_msg = '%s != %s' % (self.count, self.expected)
assert self.count == self.expected, error_msg
def __exit__(self, exc_type, exc_val, exc_tb):
super(assert_query_count, self).__exit__(exc_type, exc_val, exc_tb)
self._assert_count()
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