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
59 re_from = re.compile('.* from "?([a-zA-Z_0-9]+)"? .*$');
60 re_into = re.compile('.* into "?([a-zA-Z_0-9]+)"? .*$');
63 def log(msg, lvl=netsvc.LOG_DEBUG2):
64 logger = netsvc.Logger()
65 logger.notifyChannel('sql', lvl, msg)
74 def wrapper(self, *args, **kwargs):
76 raise psycopg2.ProgrammingError('Unable to use the cursor after having closed it')
77 return f(self, *args, **kwargs)
80 def __init__(self, pool, dbname, serialized=False):
81 self.sql_from_log = {}
82 self.sql_into_log = {}
84 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 cannot 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)
126 except psycopg2.ProgrammingError, pe:
127 logger= netsvc.Logger()
128 logger.notifyChannel('sql_db', netsvc.LOG_ERROR, "Programming error: %s, in query %s" % (pe, query))
131 log("bad query: %s" % self._obj.query)
136 delay = mdt.now() - now
137 delay = delay.seconds * 1E6 + delay.microseconds
139 log("query: %s" % self._obj.query)
140 self.sql_log_count+=1
141 res_from = re_from.match(query.lower())
143 self.sql_from_log.setdefault(res_from.group(1), [0, 0])
144 self.sql_from_log[res_from.group(1)][0] += 1
145 self.sql_from_log[res_from.group(1)][1] += delay
146 res_into = re_into.match(query.lower())
148 self.sql_into_log.setdefault(res_into.group(1), [0, 0])
149 self.sql_into_log[res_into.group(1)][0] += 1
150 self.sql_into_log[res_into.group(1)][1] += delay
155 sql_counter += self.sql_log_count
159 sqllogs = {'from':self.sql_from_log, 'into':self.sql_into_log}
162 sqllogitems = sqllogs[type].items()
163 sqllogitems.sort(key=lambda k: k[1][1])
164 log("SQL LOG %s:" % (type,))
165 for r in sqllogitems:
166 delay = timedelta(microseconds=r[1][1])
167 log("table: %s: %s/%s" %(r[0], str(delay), r[1][0]))
169 sqllogs[type].clear()
170 sum = timedelta(microseconds=sum)
171 log("SUM %s:%s/%d [%d]" % (type, str(sum), self.sql_log_count, sql_counter))
172 sqllogs[type].clear()
175 self.sql_log_count = 0
185 if not self._serialized:
186 self.rollback() # Ensure we close the current transaction.
190 # This force the cursor to be freed, and thus, available again. It is
191 # important because otherwise we can overload the server very easily
192 # because of a cursor shortage (because cursors are not garbage
193 # collected as fast as they should). The problem is probably due in
194 # part because browse records keep a reference to the cursor.
197 self._pool.give_back(self._cnx)
200 def autocommit(self, on):
201 offlevel = [ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_SERIALIZABLE][bool(self._serialized)]
202 self._cnx.set_isolation_level([offlevel, ISOLATION_LEVEL_AUTOCOMMIT][bool(on)])
206 return self._cnx.commit()
210 return self._cnx.rollback()
213 def __getattr__(self, name):
214 return getattr(self._obj, name)
217 class ConnectionPool(object):
221 def _locked(self, *args, **kwargs):
224 return fun(self, *args, **kwargs)
230 def __init__(self, maxconn=64):
231 self._connections = []
232 self._maxconn = max(maxconn, 1)
233 self._lock = threading.Lock()
234 self._logger = netsvc.Logger()
237 #self._logger.notifyChannel('ConnectionPool', netsvc.LOG_INFO, msg)
239 def _debug(self, msg):
240 #self._logger.notifyChannel('ConnectionPool', netsvc.LOG_DEBUG, msg)
244 def borrow(self, dsn):
245 self._log('Borrow connection to %s' % (dsn,))
248 for i, (cnx, used) in enumerate(self._connections):
249 if not used and dsn_are_equals(cnx.dsn, dsn):
250 self._debug('Existing connection found at index %d' % i)
252 self._connections.pop(i)
253 self._connections.append((cnx, True))
260 if len(self._connections) >= self._maxconn:
261 # try to remove the older connection not used
262 for i, (cnx, used) in enumerate(self._connections):
264 self._debug('Removing old connection at index %d: %s' % (i, cnx.dsn))
265 self._connections.pop(i)
268 # note: this code is called only if the for loop has completed (no break)
269 raise PoolError('Connection Pool Full')
271 self._debug('Create new connection')
272 result = psycopg2.connect(dsn=dsn)
273 self._connections.append((result, True))
277 def give_back(self, connection):
278 self._log('Give back connection to %s' % (connection.dsn,))
279 for i, (cnx, used) in enumerate(self._connections):
280 if cnx is connection:
281 self._connections.pop(i)
282 self._connections.append((cnx, False))
285 raise PoolError('This connection does not below to the pool')
288 def close_all(self, dsn):
289 for i, (cnx, used) in tools.reverse_enumerate(self._connections):
290 if dsn_are_equals(cnx.dsn, dsn):
292 self._connections.pop(i)
295 class Connection(object):
298 def __init__(self, pool, dbname, unique=False):
301 self._unique = unique
308 def __exit__(self, exc_type, exc_value, traceback):
313 if self.dbname not in self.__LOCKS:
314 self.__LOCKS[self.dbname] = threading.Lock()
315 self.__LOCKS[self.dbname].acquire()
318 close_db(self.dbname)
319 self.__LOCKS[self.dbname].release()
321 def cursor(self, serialized=False):
323 lock = self.__LOCKS.get(self.dbname, None)
324 if not (lock and lock.locked()):
325 netsvc.Logger().notifyChannel('Connection', netsvc.LOG_WARNING, 'Unprotected connection to %s' % (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 unique = db_name in ['template1', 'template0']
363 return Connection(_Pool, db_name, unique)
365 def close_db(db_name):
366 _Pool.close_all(dsn(db_name))
367 tools.cache.clean_caches_for_db(db_name)
370 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: