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# coding: utf-8
#
$license
try:
sqlite_ok = True
import cyclone.sqlite
except ImportError, sqlite_err:
sqlite_ok = False
import cyclone.redis
from twisted.enterprise import adbapi
from twisted.internet import defer
from twisted.internet import reactor
from twisted.python import log
class DatabaseMixin(object):
mysql = None
redis = None
sqlite = None
@classmethod
def setup(cls, conf):
if "sqlite_settings" in conf:
if sqlite_ok:
DatabaseMixin.sqlite = \
cyclone.sqlite.InlineSQLite(conf["sqlite_settings"].database)
else:
log.err("SQLite is currently disabled: %s" % sqlite_err)
if "redis_settings" in conf:
if conf["redis_settings"].get("unixsocket"):
DatabaseMixin.redis = \
cyclone.redis.lazyUnixConnectionPool(
conf["redis_settings"].unixsocket,
conf["redis_settings"].dbid,
conf["redis_settings"].poolsize)
else:
DatabaseMixin.redis = \
cyclone.redis.lazyConnectionPool(
conf["redis_settings"].host,
conf["redis_settings"].port,
conf["redis_settings"].dbid,
conf["redis_settings"].poolsize)
if "mysql_settings" in conf:
DatabaseMixin.mysql = \
adbapi.ConnectionPool("MySQLdb",
host=conf["mysql_settings"].host,
port=conf["mysql_settings"].port,
db=conf["mysql_settings"].database,
user=conf["mysql_settings"].username,
passwd=conf["mysql_settings"].password,
cp_min=1,
cp_max=conf["mysql_settings"].poolsize,
cp_reconnect=True,
cp_noisy=conf["mysql_settings"].debug)
# Ping MySQL to avoid timeouts. On timeouts, the first query
# responds with the following error, before it reconnects:
# mysql.Error: (2006, 'MySQL server has gone away')
#
# There's no way differentiate this from the server shutting down
# and write() failing. To avoid the timeout, we ping.
@defer.inlineCallbacks
def _ping_mysql():
try:
yield cls.mysql.runQuery("select 1")
except Exception, e:
log.msg("MySQL ping error:", e)
else:
if conf["mysql_settings"].debug:
log.msg("MySQL ping: OK")
reactor.callLater(conf["mysql_settings"].ping, _ping_mysql)
if conf["mysql_settings"].ping > 1:
_ping_mysql()
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