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
58 from inspect import stack
61 re_from = re.compile('.* from "?([a-zA-Z_0-9]+)"? .*$');
62 re_into = re.compile('.* into "?([a-zA-Z_0-9]+)"? .*$');
65 def log(msg, lvl=netsvc.LOG_DEBUG):
66 logger = netsvc.Logger()
67 logger.notifyChannel('sql', lvl, msg)
74 def wrapper(self, *args, **kwargs):
76 raise psycopg2.ProgrammingError('Unable to use the cursor after having closing 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
86 self.__closed = True # avoid the call of close() (by __del__) if an exception
87 # is raised by any of the following initialisations
90 self._serialized = serialized
91 self._cnx = pool.borrow(dsn(dbname))
92 self._obj = self._cnx.cursor(cursor_factory=psycopg1cursor)
93 self.__closed = False # real initialisation value
94 self.autocommit(False)
95 self.__caller = tuple(stack()[2][1:3])
99 # Oops. 'self' has not been closed explicitly.
100 # The cursor will be deleted by the garbage collector,
101 # but the database connection is not put back into the connection
102 # pool, preventing some operation on the database like dropping it.
103 # This can also lead to a server overload.
104 msg = "Cursor not closed explicitly\n" \
105 "Cursor was created at %s:%s" % self.__caller
106 log(msg, netsvc.LOG_WARNING)
110 def execute(self, query, params=None):
111 if '%d' in query or '%f' in query:
112 log(query, netsvc.LOG_WARNING)
113 log("SQL queries mustn't contain %d or %f anymore. Use only %s", netsvc.LOG_WARNING)
115 query = query.replace('%d', '%s').replace('%f', '%s')
121 params = params or None
122 res = self._obj.execute(query, params)
124 log("bad query: %s" % self._obj.query)
129 delay = mdt.now() - now
130 delay = delay.seconds * 1E6 + delay.microseconds
132 log("query: %s" % self._obj.query)
133 self.sql_log_count+=1
134 res_from = re_from.match(query.lower())
136 self.sql_from_log.setdefault(res_from.group(1), [0, 0])
137 self.sql_from_log[res_from.group(1)][0] += 1
138 self.sql_from_log[res_from.group(1)][1] += delay
139 res_into = re_into.match(query.lower())
141 self.sql_into_log.setdefault(res_into.group(1), [0, 0])
142 self.sql_into_log[res_into.group(1)][0] += 1
143 self.sql_into_log[res_into.group(1)][1] += delay
151 sqllogs = {'from':self.sql_from_log, 'into':self.sql_into_log}
152 if not sqllogs[type]:
154 sqllogitems = sqllogs[type].items()
155 sqllogitems.sort(key=lambda k: k[1][1])
157 log("SQL LOG %s:" % (type,))
158 for r in sqllogitems:
159 delay = timedelta(microseconds=r[1][1])
160 log("table: %s: %s/%s" %(r[0], str(delay), r[1][0]))
162 sum = timedelta(microseconds=sum)
163 log("SUM:%s/%d" % (str(sum), self.sql_log_count))
164 sqllogs[type].clear()
167 self.sql_log_count = 0
177 if not self._serialized:
178 self.rollback() # Ensure we close the current transaction.
182 # This force the cursor to be freed, and thus, available again. It is
183 # important because otherwise we can overload the server very easily
184 # because of a cursor shortage (because cursors are not garbage
185 # collected as fast as they should). The problem is probably due in
186 # part because browse records keep a reference to the cursor.
189 keep_in_pool = self.dbname not in ('template1', 'template0', 'postgres')
190 self._pool.give_back(self._cnx, keep_in_pool=keep_in_pool)
193 def autocommit(self, on):
194 offlevel = [ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_SERIALIZABLE][bool(self._serialized)]
195 self._cnx.set_isolation_level([offlevel, ISOLATION_LEVEL_AUTOCOMMIT][bool(on)])
199 return self._cnx.commit()
203 return self._cnx.rollback()
206 def __getattr__(self, name):
207 return getattr(self._obj, name)
210 class ConnectionPool(object):
214 def _locked(self, *args, **kwargs):
217 return fun(self, *args, **kwargs)
223 def __init__(self, maxconn=64):
224 self._connections = []
225 self._maxconn = max(maxconn, 1)
226 self._lock = threading.Lock()
227 self._logger = netsvc.Logger()
230 used = len([1 for c, u in self._connections[:] if u])
231 count = len(self._connections)
232 return "ConnectionPool(used=%d/count=%d/max=%d)" % (used, count, self._maxconn)
234 def _debug(self, msg):
235 self._logger.notifyChannel('ConnectionPool', netsvc.LOG_DEBUG, repr(self))
236 self._logger.notifyChannel('ConnectionPool', netsvc.LOG_DEBUG, msg)
239 def borrow(self, dsn):
240 self._debug('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 oldest 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('The Connection Pool Is 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, keep_in_pool=True):
273 self._debug('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)
278 self._connections.append((cnx, False))
279 self._debug('Put connection to %s in pool' % (cnx.dsn,))
282 raise PoolError('This connection does not below to the pool')
285 def close_all(self, dsn):
286 self._debug('Close all connections to %s' % (dsn,))
287 for i, (cnx, used) in tools.reverse_enumerate(self._connections):
288 if dsn_are_equals(cnx.dsn, dsn):
290 self._connections.pop(i)
293 class Connection(object):
294 def _debug(self, msg):
295 self._logger.notifyChannel('Connection', netsvc.LOG_DEBUG, msg)
297 def __init__(self, pool, dbname):
300 self._logger = netsvc.Logger()
302 def cursor(self, serialized=False):
303 cursor_type = serialized and 'serialized ' or ''
304 self._debug('create %scursor to "%s"' % (cursor_type, self.dbname,))
305 return Cursor(self._pool, self.dbname, serialized=serialized)
307 def serialized_cursor(self):
308 return self.cursor(True)
310 def __nonzero__(self):
311 """Check if connection is possible"""
321 for p in ('host', 'port', 'user', 'password'):
322 cfg = tools.config['db_' + p]
324 _dsn += '%s=%s ' % (p, cfg)
327 return '%sdbname=%s' % (_dsn, db_name)
329 def dsn_are_equals(first, second):
331 k = dict(x.split('=', 1) for x in dsn.strip().split())
332 k.pop('password', None) # password is not relevant
334 return key(first) == key(second)
337 _Pool = ConnectionPool(int(tools.config['db_maxconn']))
339 def db_connect(db_name):
340 return Connection(_Pool, db_name)
342 def close_db(db_name):
343 _Pool.close_all(dsn(db_name))
344 tools.cache.clean_caches_for_db(db_name)
347 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: