417 lines
13 KiB
Python
417 lines
13 KiB
Python
from sqlalchemy.engine import url as sa_url
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from sqlalchemy import create_engine
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from sqlalchemy import text
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from sqlalchemy import exc
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from sqlalchemy.util import compat
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from . import config, engines
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import collections
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import os
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import time
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import logging
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log = logging.getLogger(__name__)
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FOLLOWER_IDENT = None
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class register(object):
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def __init__(self):
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self.fns = {}
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@classmethod
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def init(cls, fn):
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return register().for_db("*")(fn)
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def for_db(self, dbname):
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def decorate(fn):
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self.fns[dbname] = fn
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return self
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return decorate
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def __call__(self, cfg, *arg):
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if isinstance(cfg, compat.string_types):
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url = sa_url.make_url(cfg)
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elif isinstance(cfg, sa_url.URL):
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url = cfg
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else:
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url = cfg.db.url
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backend = url.get_backend_name()
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if backend in self.fns:
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return self.fns[backend](cfg, *arg)
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else:
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return self.fns['*'](cfg, *arg)
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def create_follower_db(follower_ident):
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for cfg in _configs_for_db_operation():
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log.info("CREATE database %s, URI %r", follower_ident, cfg.db.url)
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_create_db(cfg, cfg.db, follower_ident)
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def configure_follower(follower_ident):
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for cfg in config.Config.all_configs():
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_configure_follower(cfg, follower_ident)
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def setup_config(db_url, options, file_config, follower_ident):
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if follower_ident:
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db_url = _follower_url_from_main(db_url, follower_ident)
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db_opts = {}
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_update_db_opts(db_url, db_opts)
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eng = engines.testing_engine(db_url, db_opts)
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_post_configure_engine(db_url, eng, follower_ident)
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eng.connect().close()
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cfg = config.Config.register(eng, db_opts, options, file_config)
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if follower_ident:
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_configure_follower(cfg, follower_ident)
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return cfg
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def drop_follower_db(follower_ident):
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for cfg in _configs_for_db_operation():
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log.info("DROP database %s, URI %r", follower_ident, cfg.db.url)
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_drop_db(cfg, cfg.db, follower_ident)
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def _configs_for_db_operation():
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hosts = set()
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for cfg in config.Config.all_configs():
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cfg.db.dispose()
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for cfg in config.Config.all_configs():
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url = cfg.db.url
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backend = url.get_backend_name()
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host_conf = (
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backend,
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url.username, url.host, url.database)
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if host_conf not in hosts:
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yield cfg
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hosts.add(host_conf)
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for cfg in config.Config.all_configs():
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cfg.db.dispose()
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@register.init
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def _create_db(cfg, eng, ident):
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raise NotImplementedError("no DB creation routine for cfg: %s" % eng.url)
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@register.init
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def _drop_db(cfg, eng, ident):
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raise NotImplementedError("no DB drop routine for cfg: %s" % eng.url)
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@register.init
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def _update_db_opts(db_url, db_opts):
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pass
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@register.init
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def _configure_follower(cfg, ident):
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pass
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@register.init
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def _post_configure_engine(url, engine, follower_ident):
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pass
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@register.init
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def _follower_url_from_main(url, ident):
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url = sa_url.make_url(url)
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url.database = ident
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return url
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@_update_db_opts.for_db("mssql")
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def _mssql_update_db_opts(db_url, db_opts):
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db_opts['legacy_schema_aliasing'] = False
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@_follower_url_from_main.for_db("sqlite")
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def _sqlite_follower_url_from_main(url, ident):
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url = sa_url.make_url(url)
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if not url.database or url.database == ':memory:':
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return url
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else:
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return sa_url.make_url("sqlite:///%s.db" % ident)
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@_post_configure_engine.for_db("sqlite")
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def _sqlite_post_configure_engine(url, engine, follower_ident):
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from sqlalchemy import event
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@event.listens_for(engine, "connect")
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def connect(dbapi_connection, connection_record):
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# use file DBs in all cases, memory acts kind of strangely
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# as an attached
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if not follower_ident:
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dbapi_connection.execute(
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'ATTACH DATABASE "test_schema.db" AS test_schema')
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else:
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dbapi_connection.execute(
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'ATTACH DATABASE "%s_test_schema.db" AS test_schema'
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% follower_ident)
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@_create_db.for_db("postgresql")
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def _pg_create_db(cfg, eng, ident):
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template_db = cfg.options.postgresql_templatedb
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with eng.connect().execution_options(
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isolation_level="AUTOCOMMIT") as conn:
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try:
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_pg_drop_db(cfg, conn, ident)
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except Exception:
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pass
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if not template_db:
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template_db = conn.scalar("select current_database()")
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for attempt in range(3):
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try:
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conn.execute(
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"CREATE DATABASE %s TEMPLATE %s" % (ident, template_db))
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except exc.OperationalError as err:
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if "accessed by other users" in str(err):
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log.info(
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"Waiting to create %s, URI %r, "
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"template DB %s is in use sleeping for .5",
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ident, eng.url, template_db)
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time.sleep(.5)
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else:
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break
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else:
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raise err
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@_create_db.for_db("mysql")
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def _mysql_create_db(cfg, eng, ident):
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with eng.connect() as conn:
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try:
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_mysql_drop_db(cfg, conn, ident)
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except Exception:
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pass
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conn.execute("CREATE DATABASE %s" % ident)
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conn.execute("CREATE DATABASE %s_test_schema" % ident)
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conn.execute("CREATE DATABASE %s_test_schema_2" % ident)
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@_configure_follower.for_db("mysql")
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def _mysql_configure_follower(config, ident):
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config.test_schema = "%s_test_schema" % ident
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config.test_schema_2 = "%s_test_schema_2" % ident
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@_create_db.for_db("sqlite")
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def _sqlite_create_db(cfg, eng, ident):
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pass
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@_drop_db.for_db("postgresql")
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def _pg_drop_db(cfg, eng, ident):
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with eng.connect().execution_options(
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isolation_level="AUTOCOMMIT") as conn:
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conn.execute(
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text(
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"select pg_terminate_backend(pid) from pg_stat_activity "
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"where usename=current_user and pid != pg_backend_pid() "
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"and datname=:dname"
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), dname=ident)
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conn.execute("DROP DATABASE %s" % ident)
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@_drop_db.for_db("sqlite")
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def _sqlite_drop_db(cfg, eng, ident):
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if ident:
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os.remove("%s_test_schema.db" % ident)
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else:
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os.remove("%s.db" % ident)
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@_drop_db.for_db("mysql")
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def _mysql_drop_db(cfg, eng, ident):
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with eng.connect() as conn:
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conn.execute("DROP DATABASE %s_test_schema" % ident)
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conn.execute("DROP DATABASE %s_test_schema_2" % ident)
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conn.execute("DROP DATABASE %s" % ident)
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@_create_db.for_db("oracle")
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def _oracle_create_db(cfg, eng, ident):
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# NOTE: make sure you've run "ALTER DATABASE default tablespace users" or
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# similar, so that the default tablespace is not "system"; reflection will
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# fail otherwise
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with eng.connect() as conn:
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conn.execute("create user %s identified by xe" % ident)
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conn.execute("create user %s_ts1 identified by xe" % ident)
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conn.execute("create user %s_ts2 identified by xe" % ident)
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conn.execute("grant dba to %s" % (ident, ))
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conn.execute("grant unlimited tablespace to %s" % ident)
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conn.execute("grant unlimited tablespace to %s_ts1" % ident)
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conn.execute("grant unlimited tablespace to %s_ts2" % ident)
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@_configure_follower.for_db("oracle")
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def _oracle_configure_follower(config, ident):
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config.test_schema = "%s_ts1" % ident
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config.test_schema_2 = "%s_ts2" % ident
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def _ora_drop_ignore(conn, dbname):
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try:
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conn.execute("drop user %s cascade" % dbname)
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log.info("Reaped db: %s", dbname)
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return True
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except exc.DatabaseError as err:
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log.warning("couldn't drop db: %s", err)
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return False
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@_drop_db.for_db("oracle")
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def _oracle_drop_db(cfg, eng, ident):
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with eng.connect() as conn:
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# cx_Oracle seems to occasionally leak open connections when a large
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# suite it run, even if we confirm we have zero references to
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# connection objects.
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# while there is a "kill session" command in Oracle,
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# it unfortunately does not release the connection sufficiently.
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_ora_drop_ignore(conn, ident)
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_ora_drop_ignore(conn, "%s_ts1" % ident)
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_ora_drop_ignore(conn, "%s_ts2" % ident)
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@_update_db_opts.for_db("oracle")
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def _oracle_update_db_opts(db_url, db_opts):
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pass
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def reap_dbs(idents_file):
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log.info("Reaping databases...")
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urls = collections.defaultdict(set)
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idents = collections.defaultdict(set)
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with open(idents_file) as file_:
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for line in file_:
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line = line.strip()
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db_name, db_url = line.split(" ")
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url_obj = sa_url.make_url(db_url)
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url_key = (url_obj.get_backend_name(), url_obj.host)
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urls[url_key].add(db_url)
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idents[url_key].add(db_name)
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for url_key in urls:
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backend = url_key[0]
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url = list(urls[url_key])[0]
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ident = idents[url_key]
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if backend == "oracle":
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_reap_oracle_dbs(url, ident)
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elif backend == "mssql":
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_reap_mssql_dbs(url, ident)
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def _reap_oracle_dbs(url, idents):
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log.info("db reaper connecting to %r", url)
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eng = create_engine(url)
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with eng.connect() as conn:
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log.info("identifiers in file: %s", ", ".join(idents))
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to_reap = conn.execute(
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"select u.username from all_users u where username "
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"like 'TEST_%' and not exists (select username "
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"from v$session where username=u.username)")
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all_names = {username.lower() for (username, ) in to_reap}
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to_drop = set()
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for name in all_names:
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if name.endswith("_ts1") or name.endswith("_ts2"):
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continue
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elif name in idents:
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to_drop.add(name)
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if "%s_ts1" % name in all_names:
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to_drop.add("%s_ts1" % name)
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if "%s_ts2" % name in all_names:
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to_drop.add("%s_ts2" % name)
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dropped = total = 0
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for total, username in enumerate(to_drop, 1):
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if _ora_drop_ignore(conn, username):
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dropped += 1
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log.info(
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"Dropped %d out of %d stale databases detected",
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dropped, total)
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@_follower_url_from_main.for_db("oracle")
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def _oracle_follower_url_from_main(url, ident):
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url = sa_url.make_url(url)
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url.username = ident
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url.password = 'xe'
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return url
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@_create_db.for_db("mssql")
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def _mssql_create_db(cfg, eng, ident):
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with eng.connect().execution_options(
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isolation_level="AUTOCOMMIT") as conn:
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conn.execute("create database %s" % ident)
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conn.execute(
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"ALTER DATABASE %s SET ALLOW_SNAPSHOT_ISOLATION ON" % ident)
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conn.execute(
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"ALTER DATABASE %s SET READ_COMMITTED_SNAPSHOT ON" % ident)
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conn.execute("use %s" % ident)
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conn.execute("create schema test_schema")
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@_drop_db.for_db("mssql")
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def _mssql_drop_db(cfg, eng, ident):
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with eng.connect().execution_options(
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isolation_level="AUTOCOMMIT") as conn:
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_mssql_drop_ignore(conn, ident)
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def _mssql_drop_ignore(conn, ident):
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try:
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# typically when this happens, we can't KILL the session anyway,
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# so let the cleanup process drop the DBs
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# for row in conn.execute("select session_id from sys.dm_exec_sessions "
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# "where database_id=db_id('%s')" % ident):
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# log.info("killing SQL server sesssion %s", row['session_id'])
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# conn.execute("kill %s" % row['session_id'])
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conn.execute("drop database %s" % ident)
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log.info("Reaped db: %s", ident)
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return True
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except exc.DatabaseError as err:
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log.warning("couldn't drop db: %s", err)
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return False
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def _reap_mssql_dbs(url, idents):
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log.info("db reaper connecting to %r", url)
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eng = create_engine(url)
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with eng.connect().execution_options(
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isolation_level="AUTOCOMMIT") as conn:
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log.info("identifiers in file: %s", ", ".join(idents))
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to_reap = conn.execute(
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"select d.name from sys.databases as d where name "
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"like 'TEST_%' and not exists (select session_id "
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"from sys.dm_exec_sessions "
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"where database_id=d.database_id)")
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all_names = {dbname.lower() for (dbname, ) in to_reap}
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to_drop = set()
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for name in all_names:
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if name in idents:
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to_drop.add(name)
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dropped = total = 0
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for total, dbname in enumerate(to_drop, 1):
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if _mssql_drop_ignore(conn, dbname):
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dropped += 1
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log.info(
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"Dropped %d out of %d stale databases detected",
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dropped, total)
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