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Mini Shell
import collections
import logging
import os
import time
from . import config
from . import engines
from .. import create_engine
from .. import exc
from .. import text
from ..engine import url as sa_url
from ..util import compat
log = logging.getLogger(__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 = url.get_backend_name()
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():
log.info("CREATE database %s, URI %r", follower_ident, cfg.db.url)
_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, options, file_config, follower_ident):
if follower_ident:
db_url = _follower_url_from_main(db_url, follower_ident)
db_opts = {}
_update_db_opts(db_url, db_opts)
eng = engines.testing_engine(db_url, db_opts)
_post_configure_engine(db_url, eng, follower_ident)
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():
log.info("DROP database %s, URI %r", follower_ident, cfg.db.url)
_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 = url.get_backend_name()
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 _update_db_opts(db_url, db_opts):
pass
@register.init
def _configure_follower(cfg, ident):
pass
@register.init
def _post_configure_engine(url, engine, follower_ident):
pass
@register.init
def _follower_url_from_main(url, ident):
url = sa_url.make_url(url)
url.database = ident
return url
@_update_db_opts.for_db("mssql")
def _mssql_update_db_opts(db_url, db_opts):
db_opts["legacy_schema_aliasing"] = False
@_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)
@_post_configure_engine.for_db("sqlite")
def _sqlite_post_configure_engine(url, engine, follower_ident):
from sqlalchemy import event
@event.listens_for(engine, "connect")
def connect(dbapi_connection, connection_record):
# use file DBs in all cases, memory acts kind of strangely
# as an attached
if not follower_ident:
dbapi_connection.execute(
'ATTACH DATABASE "test_schema.db" AS test_schema'
)
else:
dbapi_connection.execute(
'ATTACH DATABASE "%s_test_schema.db" AS test_schema'
% follower_ident
)
@_create_db.for_db("postgresql")
def _pg_create_db(cfg, eng, ident):
template_db = cfg.options.postgresql_templatedb
with eng.connect().execution_options(isolation_level="AUTOCOMMIT") as conn:
try:
_pg_drop_db(cfg, conn, ident)
except Exception:
pass
if not template_db:
template_db = conn.scalar("select current_database()")
attempt = 0
while True:
try:
conn.execute(
"CREATE DATABASE %s TEMPLATE %s" % (ident, template_db)
)
except exc.OperationalError as err:
attempt += 1
if attempt >= 3:
raise
if "accessed by other users" in str(err):
log.info(
"Waiting to create %s, URI %r, "
"template DB %s is in use sleeping for .5",
ident,
eng.url,
template_db,
)
time.sleep(0.5)
except:
raise
else:
break
@_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 Exception:
pass
conn.execute("CREATE DATABASE %s CHARACTER SET utf8mb4" % ident)
conn.execute(
"CREATE DATABASE %s_test_schema CHARACTER SET utf8mb4" % ident
)
conn.execute(
"CREATE DATABASE %s_test_schema_2 CHARACTER SET utf8mb4" % 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):
if ident:
os.remove("%s_test_schema.db" % ident)
else:
os.remove("%s.db" % ident)
@_drop_db.for_db("mysql")
def _mysql_drop_db(cfg, eng, ident):
with eng.connect() as conn:
conn.execute("DROP DATABASE %s_test_schema" % ident)
conn.execute("DROP DATABASE %s_test_schema_2" % ident)
conn.execute("DROP DATABASE %s" % ident)
@_create_db.for_db("oracle")
def _oracle_create_db(cfg, eng, ident):
# NOTE: make sure you've run "ALTER DATABASE default tablespace users" or
# similar, so that the default tablespace is not "system"; reflection will
# fail otherwise
with eng.connect() as conn:
conn.execute("create user %s identified by xe" % ident)
conn.execute("create user %s_ts1 identified by xe" % ident)
conn.execute("create user %s_ts2 identified by xe" % ident)
conn.execute("grant dba to %s" % (ident,))
conn.execute("grant unlimited tablespace to %s" % ident)
conn.execute("grant unlimited tablespace to %s_ts1" % ident)
conn.execute("grant unlimited tablespace to %s_ts2" % ident)
@_configure_follower.for_db("oracle")
def _oracle_configure_follower(config, ident):
config.test_schema = "%s_ts1" % ident
config.test_schema_2 = "%s_ts2" % ident
def _ora_drop_ignore(conn, dbname):
try:
conn.execute("drop user %s cascade" % dbname)
log.info("Reaped db: %s", dbname)
return True
except exc.DatabaseError as err:
log.warning("couldn't drop db: %s", err)
return False
@_drop_db.for_db("oracle")
def _oracle_drop_db(cfg, eng, ident):
with eng.connect() as conn:
# cx_Oracle seems to occasionally leak open connections when a large
# suite it run, even if we confirm we have zero references to
# connection objects.
# while there is a "kill session" command in Oracle,
# it unfortunately does not release the connection sufficiently.
_ora_drop_ignore(conn, ident)
_ora_drop_ignore(conn, "%s_ts1" % ident)
_ora_drop_ignore(conn, "%s_ts2" % ident)
@_update_db_opts.for_db("oracle")
def _oracle_update_db_opts(db_url, db_opts):
pass
def reap_dbs(idents_file):
log.info("Reaping databases...")
urls = collections.defaultdict(set)
idents = collections.defaultdict(set)
with open(idents_file) as file_:
for line in file_:
line = line.strip()
db_name, db_url = line.split(" ")
url_obj = sa_url.make_url(db_url)
url_key = (url_obj.get_backend_name(), url_obj.host)
urls[url_key].add(db_url)
idents[url_key].add(db_name)
for url_key in urls:
backend = url_key[0]
url = list(urls[url_key])[0]
ident = idents[url_key]
if backend == "oracle":
_reap_oracle_dbs(url, ident)
elif backend == "mssql":
_reap_mssql_dbs(url, ident)
def _reap_oracle_dbs(url, idents):
log.info("db reaper connecting to %r", url)
eng = create_engine(url)
with eng.connect() as conn:
log.info("identifiers in file: %s", ", ".join(idents))
to_reap = conn.execute(
"select u.username from all_users u where username "
"like 'TEST_%' and not exists (select username "
"from v$session where username=u.username)"
)
all_names = {username.lower() for (username,) in to_reap}
to_drop = set()
for name in all_names:
if name.endswith("_ts1") or name.endswith("_ts2"):
continue
elif name in idents:
to_drop.add(name)
if "%s_ts1" % name in all_names:
to_drop.add("%s_ts1" % name)
if "%s_ts2" % name in all_names:
to_drop.add("%s_ts2" % name)
dropped = total = 0
for total, username in enumerate(to_drop, 1):
if _ora_drop_ignore(conn, username):
dropped += 1
log.info(
"Dropped %d out of %d stale databases detected", dropped, total
)
@_follower_url_from_main.for_db("oracle")
def _oracle_follower_url_from_main(url, ident):
url = sa_url.make_url(url)
url.username = ident
url.password = "xe"
return url
@_create_db.for_db("mssql")
def _mssql_create_db(cfg, eng, ident):
with eng.connect().execution_options(isolation_level="AUTOCOMMIT") as conn:
conn.execute("create database %s" % ident)
conn.execute(
"ALTER DATABASE %s SET ALLOW_SNAPSHOT_ISOLATION ON" % ident
)
conn.execute(
"ALTER DATABASE %s SET READ_COMMITTED_SNAPSHOT ON" % ident
)
conn.execute("use %s" % ident)
conn.execute("create schema test_schema")
conn.execute("create schema test_schema_2")
@_drop_db.for_db("mssql")
def _mssql_drop_db(cfg, eng, ident):
with eng.connect().execution_options(isolation_level="AUTOCOMMIT") as conn:
_mssql_drop_ignore(conn, ident)
def _mssql_drop_ignore(conn, ident):
try:
# typically when this happens, we can't KILL the session anyway,
# so let the cleanup process drop the DBs
# for row in conn.execute(
# "select session_id from sys.dm_exec_sessions "
# "where database_id=db_id('%s')" % ident):
# log.info("killing SQL server sesssion %s", row['session_id'])
# conn.execute("kill %s" % row['session_id'])
conn.execute("drop database %s" % ident)
log.info("Reaped db: %s", ident)
return True
except exc.DatabaseError as err:
log.warning("couldn't drop db: %s", err)
return False
def _reap_mssql_dbs(url, idents):
log.info("db reaper connecting to %r", url)
eng = create_engine(url)
with eng.connect().execution_options(isolation_level="AUTOCOMMIT") as conn:
log.info("identifiers in file: %s", ", ".join(idents))
to_reap = conn.execute(
"select d.name from sys.databases as d where name "
"like 'TEST_%' and not exists (select session_id "
"from sys.dm_exec_sessions "
"where database_id=d.database_id)"
)
all_names = {dbname.lower() for (dbname,) in to_reap}
to_drop = set()
for name in all_names:
if name in idents:
to_drop.add(name)
dropped = total = 0
for total, dbname in enumerate(to_drop, 1):
if _mssql_drop_ignore(conn, dbname):
dropped += 1
log.info(
"Dropped %d out of %d stale databases detected", dropped, total
)
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