381 lines
12 KiB
Python
381 lines
12 KiB
Python
#This file is part of Tryton. The COPYRIGHT file at the top level of
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#this repository contains the full copyright notices and license terms.
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from trytond.backend.database import DatabaseInterface, CursorInterface
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from trytond.config import CONFIG
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from psycopg2.pool import ThreadedConnectionPool
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from psycopg2.extensions import cursor as PsycopgCursor
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from psycopg2.extensions import ISOLATION_LEVEL_REPEATABLE_READ
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from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
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from psycopg2.extensions import register_type, register_adapter
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from psycopg2.extensions import UNICODE, AsIs
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try:
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from psycopg2.extensions import PYDATE, PYDATETIME, PYTIME
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except ImportError:
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PYDATE, PYDATETIME, PYTIME = None, None, None
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from psycopg2 import IntegrityError as DatabaseIntegrityError
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from psycopg2 import OperationalError as DatabaseOperationalError
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import time
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import logging
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import re
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import os
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if os.name == 'posix':
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import pwd
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from decimal import Decimal
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from sql import Flavor
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__all__ = ['Database', 'DatabaseIntegrityError', 'DatabaseOperationalError',
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'Cursor']
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RE_VERSION = re.compile(r'\S+ (\d+)\.(\d+)')
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os.environ['PGTZ'] = os.environ.get('TZ', '')
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class Database(DatabaseInterface):
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_databases = {}
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_connpool = None
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_list_cache = None
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_list_cache_timestamp = None
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_version_cache = {}
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flavor = Flavor(ilike=True)
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def __new__(cls, database_name='template1'):
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if database_name in cls._databases:
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return cls._databases[database_name]
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return DatabaseInterface.__new__(cls, database_name=database_name)
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def __init__(self, database_name='template1'):
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super(Database, self).__init__(database_name=database_name)
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self._databases.setdefault(database_name, self)
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def connect(self):
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if self._connpool is not None:
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return self
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logger = logging.getLogger('database')
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logger.info('connect to "%s"' % self.database_name)
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host = CONFIG['db_host'] and "host=%s" % CONFIG['db_host'] or ''
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port = CONFIG['db_port'] and "port=%s" % CONFIG['db_port'] or ''
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name = "dbname=%s" % self.database_name
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user = CONFIG['db_user'] and "user=%s" % CONFIG['db_user'] or ''
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password = (CONFIG['db_password']
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and "password=%s" % CONFIG['db_password'] or '')
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minconn = int(CONFIG['db_minconn']) or 1
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maxconn = int(CONFIG['db_maxconn']) or 64
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dsn = '%s %s %s %s %s' % (host, port, name, user, password)
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self._connpool = ThreadedConnectionPool(minconn, maxconn, dsn)
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return self
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def cursor(self, autocommit=False, readonly=False):
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if self._connpool is None:
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self.connect()
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conn = self._connpool.getconn()
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if autocommit:
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conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
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else:
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conn.set_isolation_level(ISOLATION_LEVEL_REPEATABLE_READ)
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cursor = Cursor(self._connpool, conn, self)
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if readonly:
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cursor.execute('SET TRANSACTION READ ONLY')
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return cursor
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def close(self):
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if self._connpool is None:
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return
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self._connpool.closeall()
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self._connpool = None
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@classmethod
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def create(cls, cursor, database_name):
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cursor.execute('CREATE DATABASE "' + database_name + '" '
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'TEMPLATE template0 ENCODING \'unicode\'')
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cls._list_cache = None
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@classmethod
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def drop(cls, cursor, database_name):
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cursor.execute('DROP DATABASE "' + database_name + '"')
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cls._list_cache = None
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def get_version(self, cursor):
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if self.database_name not in self._version_cache:
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cursor.execute('SELECT version()')
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version, = cursor.fetchone()
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self._version_cache[self.database_name] = tuple(map(int,
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RE_VERSION.search(version).groups()))
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return self._version_cache[self.database_name]
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@staticmethod
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def dump(database_name):
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from trytond.tools import exec_pg_command_pipe
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cmd = ['pg_dump', '--format=c', '--no-owner']
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if CONFIG['db_user']:
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cmd.append('--username=' + CONFIG['db_user'])
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if CONFIG['db_host']:
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cmd.append('--host=' + CONFIG['db_host'])
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if CONFIG['db_port']:
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cmd.append('--port=' + CONFIG['db_port'])
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cmd.append(database_name)
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pipe = exec_pg_command_pipe(*tuple(cmd))
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pipe.stdin.close()
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data = pipe.stdout.read()
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res = pipe.wait()
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if res:
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raise Exception('Couldn\'t dump database!')
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return data
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@staticmethod
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def restore(database_name, data):
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from trytond.tools import exec_pg_command_pipe
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database = Database().connect()
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cursor = database.cursor(autocommit=True)
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database.create(cursor, database_name)
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cursor.commit()
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cursor.close()
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cmd = ['pg_restore', '--no-owner']
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if CONFIG['db_user']:
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cmd.append('--username=' + CONFIG['db_user'])
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if CONFIG['db_host']:
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cmd.append('--host=' + CONFIG['db_host'])
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if CONFIG['db_port']:
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cmd.append('--port=' + CONFIG['db_port'])
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cmd.append('--dbname=' + database_name)
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args2 = tuple(cmd)
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if os.name == "nt":
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tmpfile = (os.environ['TMP'] or 'C:\\') + os.tmpnam()
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with open(tmpfile, 'wb') as fp:
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fp.write(data)
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args2 = list(args2)
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args2.append(' ' + tmpfile)
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args2 = tuple(args2)
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pipe = exec_pg_command_pipe(*args2)
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if not os.name == "nt":
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pipe.stdin.write(data)
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pipe.stdin.close()
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res = pipe.wait()
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if res:
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raise Exception('Couldn\'t restore database')
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database = Database(database_name).connect()
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cursor = database.cursor()
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if not cursor.test():
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cursor.close()
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database.close()
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raise Exception('Couldn\'t restore database!')
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cursor.close()
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database.close()
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Database._list_cache = None
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return True
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@staticmethod
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def list(cursor):
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now = time.time()
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timeout = int(CONFIG['session_timeout'])
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res = Database._list_cache
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if res and abs(Database._list_cache_timestamp - now) < timeout:
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return res
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db_user = CONFIG['db_user']
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if not db_user and os.name == 'posix':
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db_user = pwd.getpwuid(os.getuid())[0]
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if not db_user:
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cursor.execute("SELECT usename "
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"FROM pg_user "
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"WHERE usesysid = ("
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"SELECT datdba "
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"FROM pg_database "
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"WHERE datname = %s)",
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(CONFIG["db_name"],))
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res = cursor.fetchone()
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db_user = res and res[0]
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if db_user:
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cursor.execute("SELECT datname "
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"FROM pg_database "
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"WHERE datdba = ("
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"SELECT usesysid "
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"FROM pg_user "
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"WHERE usename=%s) "
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"AND datname not in "
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"('template0', 'template1', 'postgres') "
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"ORDER BY datname",
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(db_user,))
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else:
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cursor.execute("SELECT datname "
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"FROM pg_database "
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"WHERE datname not in "
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"('template0', 'template1','postgres') "
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"ORDER BY datname")
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res = []
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for db_name, in cursor.fetchall():
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db_name = db_name.encode('utf-8')
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try:
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database = Database(db_name).connect()
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except Exception:
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continue
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cursor2 = database.cursor()
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if cursor2.test():
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res.append(db_name)
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cursor2.close(close=True)
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else:
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cursor2.close(close=True)
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database.close()
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Database._list_cache = res
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Database._list_cache_timestamp = now
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return res
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@staticmethod
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def init(cursor):
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from trytond.modules import get_module_info
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sql_file = os.path.join(os.path.dirname(__file__), 'init.sql')
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with open(sql_file) as fp:
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for line in fp.read().split(';'):
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if (len(line) > 0) and (not line.isspace()):
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cursor.execute(line)
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for module in ('ir', 'res', 'webdav'):
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state = 'uninstalled'
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if module in ('ir', 'res'):
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state = 'to install'
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info = get_module_info(module)
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cursor.execute('SELECT NEXTVAL(\'ir_module_module_id_seq\')')
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module_id = cursor.fetchone()[0]
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cursor.execute('INSERT INTO ir_module_module '
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'(id, create_uid, create_date, name, state) '
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'VALUES (%s, %s, now(), %s, %s)',
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(module_id, 0, module, state))
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for dependency in info.get('depends', []):
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cursor.execute('INSERT INTO ir_module_module_dependency '
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'(create_uid, create_date, module, name) '
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'VALUES (%s, now(), %s, %s)',
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(0, module_id, dependency))
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class _Cursor(PsycopgCursor):
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def __build_dict(self, row):
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return dict((desc[0], row[i])
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for i, desc in enumerate(self.description))
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def dictfetchone(self):
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row = self.fetchone()
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if row:
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return self.__build_dict(row)
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else:
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return row
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def dictfetchmany(self, size):
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rows = self.fetchmany(size)
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return [self.__build_dict(row) for row in rows]
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def dictfetchall(self):
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rows = self.fetchall()
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return [self.__build_dict(row) for row in rows]
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class Cursor(CursorInterface):
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def __init__(self, connpool, conn, database):
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super(Cursor, self).__init__()
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self._connpool = connpool
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self._conn = conn
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self._database = database
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self.cursor = conn.cursor(cursor_factory=_Cursor)
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self.commit()
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self.sql_from_log = {}
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self.sql_into_log = {}
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self.count = {
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'from': 0,
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'into': 0,
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}
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@property
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def database_name(self):
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return self._database.database_name
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# TODO to remove
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@property
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def dbname(self):
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return self.database_name
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def __getattr__(self, name):
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return getattr(self.cursor, name)
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def execute(self, sql, params=None):
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if params:
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return self.cursor.execute(sql, params)
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else:
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return self.cursor.execute(sql)
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def close(self, close=False):
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self.cursor.close()
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self.rollback()
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self._connpool.putconn(self._conn, close=close)
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def commit(self):
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super(Cursor, self).commit()
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self._conn.commit()
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def rollback(self):
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super(Cursor, self).rollback()
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self._conn.rollback()
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def test(self):
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self.cursor.execute("SELECT relname "
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"FROM pg_class "
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"WHERE relkind = 'r' AND relname in ("
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"'ir_model', "
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"'ir_model_field', "
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"'ir_ui_view', "
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"'ir_ui_menu', "
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"'res_user', "
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"'res_group', "
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"'ir_module_module', "
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"'ir_module_module_dependency', "
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"'ir_translation', "
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"'ir_lang'"
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")")
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return len(self.cursor.fetchall()) != 0
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def nextid(self, table):
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self.cursor.execute("SELECT NEXTVAL('" + table + "_id_seq')")
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return self.cursor.fetchone()[0]
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def setnextid(self, table, value):
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self.cursor.execute("SELECT SETVAL('" + table + "_id_seq', %d)"
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% value)
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def currid(self, table):
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self.cursor.execute('SELECT last_value FROM "' + table + '_id_seq"')
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return self.cursor.fetchone()[0]
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def lock(self, table):
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self.cursor.execute('LOCK "%s"' % table)
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def has_constraint(self):
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return True
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def limit_clause(self, select, limit=None, offset=None):
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if limit is not None:
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select += ' LIMIT %d' % limit
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if offset is not None and offset != 0:
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select += ' OFFSET %d' % offset
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return select
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def has_returning(self):
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# RETURNING clause is available since PostgreSQL 8.2
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return self._database.get_version(self) >= (8, 2)
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register_type(UNICODE)
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if PYDATE:
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register_type(PYDATE)
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if PYDATETIME:
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register_type(PYDATETIME)
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if PYTIME:
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register_type(PYTIME)
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register_adapter(float, lambda value: AsIs(repr(value)))
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register_adapter(Decimal, lambda value: AsIs(str(value)))
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