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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import logging
import sys
import six
from decorator import decorator
from sqlalchemy import create_engine, Table, MetaData
from sqlalchemy import exc as sa_exc
from sqlalchemy.orm import create_session
from sqlalchemy.pool import StaticPool
from migrate.changeset.schema import ColumnDelta
from migrate.versioning.util import Memoize
from migrate.tests.fixture.base import Base
from migrate.tests.fixture.pathed import Pathed
log = logging.getLogger(__name__)
@Memoize
def readurls():
"""read URLs from config file return a list"""
# TODO: remove tmpfile since sqlite can store db in memory
filename = 'test_db.cfg' if six.PY2 else "test_db_py3.cfg"
ret = list()
tmpfile = Pathed.tmp()
fullpath = os.path.join(os.curdir, filename)
try:
fd = open(fullpath)
except IOError:
raise IOError("""You must specify the databases to use for testing!
Copy %(filename)s.tmpl to %(filename)s and edit your database URLs.""" % locals())
for line in fd:
if line.startswith('#'):
continue
line = line.replace('__tmp__', tmpfile).strip()
ret.append(line)
fd.close()
return ret
def is_supported(url, supported, not_supported):
db = url.split(':', 1)[0]
if supported is not None:
if isinstance(supported, six.string_types):
return supported == db
else:
return db in supported
elif not_supported is not None:
if isinstance(not_supported, six.string_types):
return not_supported != db
else:
return not (db in not_supported)
return True
def usedb(supported=None, not_supported=None):
"""Decorates tests to be run with a database connection
These tests are run once for each available database
@param supported: run tests for ONLY these databases
@param not_supported: run tests for all databases EXCEPT these
If both supported and not_supported are empty, all dbs are assumed
to be supported
"""
if supported is not None and not_supported is not None:
raise AssertionError("Can't specify both supported and not_supported in fixture.db()")
urls = readurls()
my_urls = [url for url in urls if is_supported(url, supported, not_supported)]
@decorator
def dec(f, self, *a, **kw):
failed_for = []
fail = False
for url in my_urls:
try:
log.debug("Running test with engine %s", url)
try:
self._setup(url)
except sa_exc.OperationalError:
log.info('Backend %s is not available, skip it', url)
continue
except Exception as e:
setup_exception = e
else:
setup_exception = None
try:
f(self, *a, **kw)
finally:
try:
self._teardown()
except Exception as e:
teardown_exception=e
else:
teardown_exception=None
if setup_exception or teardown_exception:
raise RuntimeError((
'Exception during _setup/_teardown:\n'
'setup: %r\n'
'teardown: %r\n'
)%(setup_exception,teardown_exception))
except Exception:
failed_for.append(url)
fail = sys.exc_info()
for url in failed_for:
log.error('Failed for %s', url)
if fail:
# cause the failure :-)
six.reraise(*fail)
return dec
class DB(Base):
# Constants: connection level
NONE = 0 # No connection; just set self.url
CONNECT = 1 # Connect; no transaction
TXN = 2 # Everything in a transaction
level = TXN
def _engineInfo(self, url=None):
if url is None:
url = self.url
return url
def _setup(self, url):
self._connect(url)
# make sure there are no tables lying around
meta = MetaData(self.engine)
meta.reflect()
meta.drop_all()
def _teardown(self):
self._disconnect()
def _connect(self, url):
self.url = url
# TODO: seems like 0.5.x branch does not work with engine.dispose and staticpool
#self.engine = create_engine(url, echo=True, poolclass=StaticPool)
self.engine = create_engine(url, echo=True)
# silence the logger added by SA, nose adds its own!
logging.getLogger('sqlalchemy').handlers=[]
self.meta = MetaData(bind=self.engine)
if self.level < self.CONNECT:
return
#self.session = create_session(bind=self.engine)
if self.level < self.TXN:
return
#self.txn = self.session.begin()
def _disconnect(self):
if hasattr(self, 'txn'):
self.txn.rollback()
if hasattr(self, 'session'):
self.session.close()
#if hasattr(self,'conn'):
# self.conn.close()
self.engine.dispose()
def _supported(self, url):
db = url.split(':',1)[0]
func = getattr(self, self._TestCase__testMethodName)
if hasattr(func, 'supported'):
return db in func.supported
if hasattr(func, 'not_supported'):
return not (db in func.not_supported)
# Neither list assigned; assume all are supported
return True
def _not_supported(self, url):
return not self._supported(url)
def _select_row(self):
"""Select rows, used in multiple tests"""
return self.table.select().execution_options(
autocommit=True).execute().fetchone()
def refresh_table(self, name=None):
"""Reload the table from the database
Assumes we're working with only a single table, self.table, and
metadata self.meta
Working w/ multiple tables is not possible, as tables can only be
reloaded with meta.clear()
"""
if name is None:
name = self.table.name
self.meta.clear()
self.table = Table(name, self.meta, autoload=True)
def compare_columns_equal(self, columns1, columns2, ignore=None):
"""Loop through all columns and compare them"""
def key(column):
return column.name
for c1, c2 in zip(sorted(columns1, key=key), sorted(columns2, key=key)):
diffs = ColumnDelta(c1, c2).diffs
if ignore:
for key in ignore:
diffs.pop(key, None)
if diffs:
self.fail("Comparing %s to %s failed: %s" % (columns1, columns2, diffs))
# TODO: document engine.dispose and write tests
|
