1 # -*- encoding: utf-8 -*-
2 ##############################################################################
4 # OpenERP, Open Source Management Solution
5 # Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
8 # This program is free software: you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation, either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 ##############################################################################
23 __all__ = ['db_connect', 'close_db']
26 from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT, ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_SERIALIZABLE
27 from psycopg2.psycopg1 import cursor as psycopg1cursor
28 from psycopg2.pool import PoolError
30 import psycopg2.extensions
32 psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
40 def unbuffer(symb, cr):
41 if symb is None: return None
44 def undecimalize(symb, cr):
45 if symb is None: return None
48 for name, typeoid in types_mapping.items():
49 psycopg2.extensions.register_type(psycopg2.extensions.new_type(typeoid, name, lambda x, cr: x))
50 psycopg2.extensions.register_type(psycopg2.extensions.new_type((700, 701, 1700,), 'float', undecimalize))
54 from tools.func import wraps
55 from datetime import datetime as mdt
56 from datetime import timedelta
60 re_from = re.compile('.* from "?([a-zA-Z_0-9]+)"? .*$');
61 re_into = re.compile('.* into "?([a-zA-Z_0-9]+)"? .*$');
64 def log(msg, lvl=netsvc.LOG_DEBUG):
65 logger = netsvc.Logger()
66 logger.notifyChannel('sql', lvl, msg)
73 def wrapper(self, *args, **kwargs):
75 raise psycopg2.ProgrammingError('Unable to use the cursor after having closing it')
76 return f(self, *args, **kwargs)
79 def __init__(self, pool, dbname, serialized=False):
80 self.sql_from_log = {}
81 self.sql_into_log = {}
83 self.sql_log_count = 0
85 self.__closed = True # avoid the call of close() (by __del__) if an exception
86 # is raised by any of the following initialisations
89 self._serialized = serialized
90 self._cnx = pool.borrow(dsn(dbname))
91 self._obj = self._cnx.cursor(cursor_factory=psycopg1cursor)
92 self.__closed = False # real initialisation value
93 self.autocommit(False)
95 if tools.config['log_level'] in (netsvc.LOG_DEBUG, netsvc.LOG_DEBUG_RPC):
96 from inspect import stack
97 self.__caller = tuple(stack()[2][1:3])
100 if not self.__closed:
101 # Oops. 'self' has not been closed explicitly.
102 # The cursor will be deleted by the garbage collector,
103 # but the database connection is not put back into the connection
104 # pool, preventing some operation on the database like dropping it.
105 # This can also lead to a server overload.
106 if tools.config['log_level'] in (netsvc.LOG_DEBUG, netsvc.LOG_DEBUG_RPC):
107 msg = "Cursor not closed explicitly\n" \
108 "Cursor was created at %s:%s" % self.__caller
109 log(msg, netsvc.LOG_WARNING)
113 def execute(self, query, params=None):
114 if '%d' in query or '%f' in query:
115 log(query, netsvc.LOG_WARNING)
116 log("SQL queries mustn't contain %d or %f anymore. Use only %s", netsvc.LOG_WARNING)
118 query = query.replace('%d', '%s').replace('%f', '%s')
124 params = params or None
125 res = self._obj.execute(query, params)
127 log("bad query: %s" % self._obj.query)
132 delay = mdt.now() - now
133 delay = delay.seconds * 1E6 + delay.microseconds
135 log("query: %s" % self._obj.query)
136 self.sql_log_count+=1
137 res_from = re_from.match(query.lower())
139 self.sql_from_log.setdefault(res_from.group(1), [0, 0])
140 self.sql_from_log[res_from.group(1)][0] += 1
141 self.sql_from_log[res_from.group(1)][1] += delay
142 res_into = re_into.match(query.lower())
144 self.sql_into_log.setdefault(res_into.group(1), [0, 0])
145 self.sql_into_log[res_into.group(1)][0] += 1
146 self.sql_into_log[res_into.group(1)][1] += delay
154 sqllogs = {'from':self.sql_from_log, 'into':self.sql_into_log}
155 if not sqllogs[type]:
157 sqllogitems = sqllogs[type].items()
158 sqllogitems.sort(key=lambda k: k[1][1])
160 log("SQL LOG %s:" % (type,))
161 for r in sqllogitems:
162 delay = timedelta(microseconds=r[1][1])
163 log("table: %s: %s/%s" %(r[0], str(delay), r[1][0]))
165 sum = timedelta(microseconds=sum)
166 log("SUM:%s/%d" % (str(sum), self.sql_log_count))
167 sqllogs[type].clear()
170 self.sql_log_count = 0
180 if not self._serialized:
181 self.rollback() # Ensure we close the current transaction.
185 # This force the cursor to be freed, and thus, available again. It is
186 # important because otherwise we can overload the server very easily
187 # because of a cursor shortage (because cursors are not garbage
188 # collected as fast as they should). The problem is probably due in
189 # part because browse records keep a reference to the cursor.
192 self._pool.give_back(self._cnx)
195 def autocommit(self, on):
196 offlevel = [ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_SERIALIZABLE][bool(self._serialized)]
197 self._cnx.set_isolation_level([offlevel, ISOLATION_LEVEL_AUTOCOMMIT][bool(on)])
201 return self._cnx.commit()
205 return self._cnx.rollback()
208 def __getattr__(self, name):
209 return getattr(self._obj, name)
212 class ConnectionPool(object):
216 def _locked(self, *args, **kwargs):
219 return fun(self, *args, **kwargs)
225 def __init__(self, maxconn=64):
226 self._connections = []
227 self._maxconn = max(maxconn, 1)
228 self._lock = threading.Lock()
229 self._logger = netsvc.Logger()
232 #self._logger.notifyChannel('ConnectionPool', netsvc.LOG_INFO, msg)
234 def _debug(self, msg):
235 #self._logger.notifyChannel('ConnectionPool', netsvc.LOG_DEBUG, msg)
239 def borrow(self, dsn):
240 self._log('Borrow connection to %s' % (dsn,))
243 for i, (cnx, used) in enumerate(self._connections):
244 if not used and dsn_are_equals(cnx.dsn, dsn):
245 self._debug('Existing connection found at index %d' % i)
247 self._connections.pop(i)
248 self._connections.append((cnx, True))
255 if len(self._connections) >= self._maxconn:
256 # try to remove the older connection not used
257 for i, (cnx, used) in enumerate(self._connections):
259 self._debug('Removing old connection at index %d: %s' % (i, cnx.dsn))
260 self._connections.pop(i)
263 # note: this code is called only if the for loop has completed (no break)
264 raise PoolError('Connection Pool Full')
266 self._debug('Create new connection')
267 result = psycopg2.connect(dsn=dsn)
268 self._connections.append((result, True))
272 def give_back(self, connection):
273 self._log('Give back connection to %s' % (connection.dsn,))
274 for i, (cnx, used) in enumerate(self._connections):
275 if cnx is connection:
276 self._connections.pop(i)
277 self._connections.append((cnx, False))
280 raise PoolError('This connection does not below to the pool')
283 def close_all(self, dsn):
284 for i, (cnx, used) in tools.reverse_enumerate(self._connections):
285 if dsn_are_equals(cnx.dsn, dsn):
287 self._connections.pop(i)
290 class Connection(object):
293 def __init__(self, pool, dbname, unique=False):
296 self._unique = unique
303 def __exit__(self, exc_type, exc_value, traceback):
308 if self.dbname not in self.__LOCKS:
309 self.__LOCKS[self.dbname] = threading.Lock()
310 self.__LOCKS[self.dbname].acquire()
313 close_db(self.dbname)
314 self.__LOCKS[self.dbname].release()
316 def cursor(self, serialized=False):
318 lock = self.__LOCKS.get(self.dbname, None)
319 if not (lock and lock.locked()):
320 netsvc.Logger().notifyChannel('Connection', netsvc.LOG_WARNING, 'Unprotected connection to %s' % (self.dbname,))
322 return Cursor(self._pool, self.dbname, serialized=serialized)
324 def serialized_cursor(self):
325 return self.cursor(True)
327 def __nonzero__(self):
328 """Check if connection is possible"""
338 for p in ('host', 'port', 'user', 'password'):
339 cfg = tools.config['db_' + p]
341 _dsn += '%s=%s ' % (p, cfg)
344 return '%sdbname=%s' % (_dsn, db_name)
346 def dsn_are_equals(first, second):
348 k = dict(x.split('=', 1) for x in dsn.strip().split())
349 k.pop('password', None) # password is not relevant
351 return key(first) == key(second)
354 _Pool = ConnectionPool(int(tools.config['db_maxconn']))
356 def db_connect(db_name):
357 unique = db_name in ['template1', 'template0']
358 return Connection(_Pool, db_name, unique)
360 def close_db(db_name):
361 _Pool.close_all(dsn(db_name))
362 tools.cache.clean_caches_for_db(db_name)
365 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: