1 # -*- coding: utf-8 -*-
2 ##############################################################################
4 # OpenERP, Open Source Management Solution
5 # Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as
9 # published by the Free Software Foundation, either version 3 of the
10 # License, or (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
20 ##############################################################################
22 __all__ = ['db_connect', 'close_db']
25 from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT, ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_SERIALIZABLE
26 from psycopg2.psycopg1 import cursor as psycopg1cursor
27 from psycopg2.pool import PoolError
29 import psycopg2.extensions
31 psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
39 def unbuffer(symb, cr):
40 if symb is None: return None
43 def undecimalize(symb, cr):
44 if symb is None: return None
47 for name, typeoid in types_mapping.items():
48 psycopg2.extensions.register_type(psycopg2.extensions.new_type(typeoid, name, lambda x, cr: x))
49 psycopg2.extensions.register_type(psycopg2.extensions.new_type((700, 701, 1700,), 'float', undecimalize))
53 from tools.func import wraps
54 from datetime import datetime as mdt
55 from datetime import timedelta
57 from inspect import stack
60 re_from = re.compile('.* from "?([a-zA-Z_0-9]+)"? .*$');
61 re_into = re.compile('.* into "?([a-zA-Z_0-9]+)"? .*$');
66 IN_MAX = 1000 # decent limit on size of IN queries - guideline = Oracle limit
67 __logger = logging.getLogger('db.cursor')
71 def wrapper(self, *args, **kwargs):
73 raise psycopg2.ProgrammingError('Unable to use the cursor after having closed it')
74 return f(self, *args, **kwargs)
77 def __init__(self, pool, dbname, serialized=False):
78 self.sql_from_log = {}
79 self.sql_into_log = {}
81 self.sql_log_count = 0
82 self.__closed = True # avoid the call of close() (by __del__) if an exception
83 # is raised by any of the following initialisations
86 self._serialized = serialized
87 self._cnx = pool.borrow(dsn(dbname))
88 self._obj = self._cnx.cursor(cursor_factory=psycopg1cursor)
89 self.__closed = False # real initialisation value
90 self.autocommit(False)
91 self.__caller = tuple(stack()[2][1:3])
95 # Oops. 'self' has not been closed explicitly.
96 # The cursor will be deleted by the garbage collector,
97 # but the database connection is not put back into the connection
98 # pool, preventing some operation on the database like dropping it.
99 # This can also lead to a server overload.
100 msg = "Cursor not closed explicitly\n" \
101 "Cursor was created at %s:%s"
102 self.__logger.warn(msg, *self.__caller)
106 def execute(self, query, params=None):
107 if '%d' in query or '%f' in query:
108 self.__logger.warn(query)
109 self.__logger.warn("SQL queries cannot contain %d or %f anymore. "
112 query = query.replace('%d', '%s').replace('%f', '%s')
118 params = params or None
119 res = self._obj.execute(query, params)
120 except psycopg2.ProgrammingError, pe:
121 self.__logger.error("Programming error: %s, in query %s", pe, query)
124 self.__logger.exception("bad query: %s", self._obj.query)
128 delay = mdt.now() - now
129 delay = delay.seconds * 1E6 + delay.microseconds
131 self.__logger.debug("query: %s", self._obj.query)
132 self.sql_log_count+=1
133 res_from = re_from.match(query.lower())
135 self.sql_from_log.setdefault(res_from.group(1), [0, 0])
136 self.sql_from_log[res_from.group(1)][0] += 1
137 self.sql_from_log[res_from.group(1)][1] += delay
138 res_into = re_into.match(query.lower())
140 self.sql_into_log.setdefault(res_into.group(1), [0, 0])
141 self.sql_into_log[res_into.group(1)][0] += 1
142 self.sql_into_log[res_into.group(1)][1] += delay
146 def split_for_in_conditions(self, ids):
147 """Split a list of identifiers into one or more smaller tuples
148 safe for IN conditions, after uniquifying them."""
149 return tools.misc.split_every(self.IN_MAX, set(ids))
153 sql_counter += self.sql_log_count
157 sqllogs = {'from':self.sql_from_log, 'into':self.sql_into_log}
160 sqllogitems = sqllogs[type].items()
161 sqllogitems.sort(key=lambda k: k[1][1])
162 self.__logger.debug("SQL LOG %s:", type)
163 for r in sqllogitems:
164 delay = timedelta(microseconds=r[1][1])
165 self.__logger.debug("table: %s: %s/%s",
166 r[0], delay, r[1][0])
168 sqllogs[type].clear()
169 sum = timedelta(microseconds=sum)
170 self.__logger.debug("SUM %s:%s/%d [%d]",
171 type, sum, self.sql_log_count, sql_counter)
172 sqllogs[type].clear()
175 self.sql_log_count = 0
180 return self._close(False)
182 def _close(self, leak=False):
188 if not self._serialized:
189 self.rollback() # Ensure we close the current transaction.
193 # This force the cursor to be freed, and thus, available again. It is
194 # important because otherwise we can overload the server very easily
195 # because of a cursor shortage (because cursors are not garbage
196 # collected as fast as they should). The problem is probably due in
197 # part because browse records keep a reference to the cursor.
202 self._cnx.leaked = True
204 keep_in_pool = self.dbname not in ('template1', 'template0', 'postgres')
205 self._pool.give_back(self._cnx, keep_in_pool=keep_in_pool)
208 def autocommit(self, on):
209 offlevel = [ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_SERIALIZABLE][bool(self._serialized)]
210 self._cnx.set_isolation_level([offlevel, ISOLATION_LEVEL_AUTOCOMMIT][bool(on)])
214 return self._cnx.commit()
218 return self._cnx.rollback()
221 def __getattr__(self, name):
222 return getattr(self._obj, name)
225 class PsycoConnection(psycopg2.extensions.connection):
228 class ConnectionPool(object):
230 __logger = logging.getLogger('db.connection_pool')
234 def _locked(self, *args, **kwargs):
237 return fun(self, *args, **kwargs)
243 def __init__(self, maxconn=64):
244 self._connections = []
245 self._maxconn = max(maxconn, 1)
246 self._lock = threading.Lock()
249 used = len([1 for c, u in self._connections[:] if u])
250 count = len(self._connections)
251 return "ConnectionPool(used=%d/count=%d/max=%d)" % (used, count, self._maxconn)
253 def _debug(self, msg, *args):
255 self.__logger.debug(msg, self, *args)
258 def borrow(self, dsn):
259 self._debug('Borrow connection to %r', dsn)
261 # free leaked connections
262 for i, (cnx, _) in tools.reverse_enumerate(self._connections):
263 if getattr(cnx, 'leaked', False):
264 delattr(cnx, 'leaked')
265 self._connections.pop(i)
266 self._connections.append((cnx, False))
267 self._debug('Free leaked connection to %r', cnx.dsn)
269 for i, (cnx, used) in enumerate(self._connections):
270 if not used and dsn_are_equals(cnx.dsn, dsn):
271 self._connections.pop(i)
272 self._connections.append((cnx, True))
273 self._debug('Existing connection found at index %d', i)
277 if len(self._connections) >= self._maxconn:
278 # try to remove the oldest connection not used
279 for i, (cnx, used) in enumerate(self._connections):
281 self._connections.pop(i)
282 self._debug('Removing old connection at index %d: %r', i, cnx.dsn)
285 # note: this code is called only if the for loop has completed (no break)
286 raise PoolError('The Connection Pool Is Full')
288 result = psycopg2.connect(dsn=dsn, connection_factory=PsycoConnection)
289 self._connections.append((result, True))
290 self._debug('Create new connection')
294 def give_back(self, connection, keep_in_pool=True):
295 self._debug('Give back connection to %r', connection.dsn)
296 for i, (cnx, used) in enumerate(self._connections):
297 if cnx is connection:
298 self._connections.pop(i)
300 self._connections.append((cnx, False))
301 self._debug('Put connection to %r in pool', cnx.dsn)
303 self._debug('Forgot connection to %r', cnx.dsn)
306 raise PoolError('This connection does not below to the pool')
309 def close_all(self, dsn):
310 self._debug('Close all connections to %r', dsn)
311 for i, (cnx, used) in tools.reverse_enumerate(self._connections):
312 if dsn_are_equals(cnx.dsn, dsn):
314 self._connections.pop(i)
317 class Connection(object):
318 __logger = logging.getLogger('db.connection')
320 def __init__(self, pool, dbname):
324 def cursor(self, serialized=False):
325 cursor_type = serialized and 'serialized ' or ''
326 self.__logger.debug('create %scursor to %r', cursor_type, self.dbname)
327 return Cursor(self._pool, self.dbname, serialized=serialized)
329 def serialized_cursor(self):
330 return self.cursor(True)
332 def __nonzero__(self):
333 """Check if connection is possible"""
343 for p in ('host', 'port', 'user', 'password'):
344 cfg = tools.config['db_' + p]
346 _dsn += '%s=%s ' % (p, cfg)
349 return '%sdbname=%s' % (_dsn, db_name)
351 def dsn_are_equals(first, second):
353 k = dict(x.split('=', 1) for x in dsn.strip().split())
354 k.pop('password', None) # password is not relevant
356 return key(first) == key(second)
359 _Pool = ConnectionPool(int(tools.config['db_maxconn']))
361 def db_connect(db_name):
362 return Connection(_Pool, db_name)
364 def close_db(db_name):
365 _Pool.close_all(dsn(db_name))
366 tools.cache.clean_caches_for_db(db_name)
369 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: