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"""NOTE: copied/adapted from SQLAlchemy master for backwards compatibility;
this should be removable when Alembic targets SQLAlchemy 1.0.0
"""
from sqlalchemy.engine import url as sa_url
from sqlalchemy import text
from ..util import compat
from . import config, engines
from .compat import get_url_backend_name
FOLLOWER_IDENT = None
class register(object):
def __init__(self):
self.fns = {}
@classmethod
def init(cls, fn):
return register().for_db("*")(fn)
def for_db(self, dbname):
def decorate(fn):
self.fns[dbname] = fn
return self
return decorate
def __call__(self, cfg, *arg):
if isinstance(cfg, compat.string_types):
url = sa_url.make_url(cfg)
elif isinstance(cfg, sa_url.URL):
url = cfg
else:
url = cfg.db.url
backend = get_url_backend_name(url)
if backend in self.fns:
return self.fns[backend](cfg, *arg)
else:
return self.fns['*'](cfg, *arg)
def create_follower_db(follower_ident):
for cfg in _configs_for_db_operation():
_create_db(cfg, cfg.db, follower_ident)
def configure_follower(follower_ident):
for cfg in config.Config.all_configs():
_configure_follower(cfg, follower_ident)
def setup_config(db_url, db_opts, options, file_config, follower_ident):
if follower_ident:
db_url = _follower_url_from_main(db_url, follower_ident)
eng = engines.testing_engine(db_url, db_opts)
eng.connect().close()
cfg = config.Config.register(eng, db_opts, options, file_config)
if follower_ident:
_configure_follower(cfg, follower_ident)
return cfg
def drop_follower_db(follower_ident):
for cfg in _configs_for_db_operation():
_drop_db(cfg, cfg.db, follower_ident)
def _configs_for_db_operation():
hosts = set()
for cfg in config.Config.all_configs():
cfg.db.dispose()
for cfg in config.Config.all_configs():
url = cfg.db.url
backend = get_url_backend_name(url)
host_conf = (
backend,
url.username, url.host, url.database)
if host_conf not in hosts:
yield cfg
hosts.add(host_conf)
for cfg in config.Config.all_configs():
cfg.db.dispose()
@register.init
def _create_db(cfg, eng, ident):
raise NotImplementedError("no DB creation routine for cfg: %s" % eng.url)
@register.init
def _drop_db(cfg, eng, ident):
raise NotImplementedError("no DB drop routine for cfg: %s" % eng.url)
@register.init
def _configure_follower(cfg, ident):
pass
@register.init
def _follower_url_from_main(url, ident):
url = sa_url.make_url(url)
url.database = ident
return url
@_follower_url_from_main.for_db("sqlite")
def _sqlite_follower_url_from_main(url, ident):
url = sa_url.make_url(url)
if not url.database or url.database == ':memory:':
return url
else:
return sa_url.make_url("sqlite:///%s.db" % ident)
@_create_db.for_db("postgresql")
def _pg_create_db(cfg, eng, ident):
with eng.connect().execution_options(
isolation_level="AUTOCOMMIT") as conn:
try:
_pg_drop_db(cfg, conn, ident)
except:
pass
currentdb = conn.scalar("select current_database()")
conn.execute("CREATE DATABASE %s TEMPLATE %s" % (ident, currentdb))
@_create_db.for_db("mysql")
def _mysql_create_db(cfg, eng, ident):
with eng.connect() as conn:
try:
_mysql_drop_db(cfg, conn, ident)
except:
pass
conn.execute("CREATE DATABASE %s" % ident)
conn.execute("CREATE DATABASE %s_test_schema" % ident)
conn.execute("CREATE DATABASE %s_test_schema_2" % ident)
@_configure_follower.for_db("mysql")
def _mysql_configure_follower(config, ident):
config.test_schema = "%s_test_schema" % ident
config.test_schema_2 = "%s_test_schema_2" % ident
@_create_db.for_db("sqlite")
def _sqlite_create_db(cfg, eng, ident):
pass
@_drop_db.for_db("postgresql")
def _pg_drop_db(cfg, eng, ident):
with eng.connect().execution_options(
isolation_level="AUTOCOMMIT") as conn:
conn.execute(
text(
"select pg_terminate_backend(pid) from pg_stat_activity "
"where usename=current_user and pid != pg_backend_pid() "
"and datname=:dname"
), dname=ident)
conn.execute("DROP DATABASE %s" % ident)
@_drop_db.for_db("sqlite")
def _sqlite_drop_db(cfg, eng, ident):
pass
#os.remove("%s.db" % ident)
@_drop_db.for_db("mysql")
def _mysql_drop_db(cfg, eng, ident):
with eng.connect() as conn:
try:
conn.execute("DROP DATABASE %s_test_schema" % ident)
except:
pass
try:
conn.execute("DROP DATABASE %s_test_schema_2" % ident)
except:
pass
try:
conn.execute("DROP DATABASE %s" % ident)
except:
pass
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