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58 lines
2.5 KiB
58 lines
2.5 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is an open source project management software.
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# Copyright (C) 2012-2021 the OpenProject GmbH
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2013 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See COPYRIGHT and LICENSE files for more details.
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#++
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# We need to ensure that we operate on a well-known TRANSACTION ISOLATION LEVEL
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# However, the default isolation level is different for MySQL and PostgreSQL and it is also
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# possible (at least for MySQL) to globally override the default for your DBMS installation.
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# Therefore we want to ensure that the isolation level is consistent on a session basis.
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# We chose READ COMMITTED as our expected default isolation level, this is the default of
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# PostgreSQL.
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module ConnectionIsolationLevel
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module ConnectionPoolPatch
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def new_connection
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connection = super
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ConnectionIsolationLevel.set_connection_isolation_level connection
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connection
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end
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end
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def self.set_connection_isolation_level(connection)
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isolation_level = 'ISOLATION LEVEL READ COMMITTED'
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if OpenProject::Database.postgresql?(connection)
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connection.execute("SET SESSION CHARACTERISTICS AS TRANSACTION #{isolation_level}")
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end
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end
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end
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ActiveRecord::ConnectionAdapters::ConnectionPool.prepend ConnectionIsolationLevel::ConnectionPoolPatch
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# in case the existing connection was created before our patch
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# N.B.: this assumes that our process only has this single thread, which is at least true today...
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ConnectionIsolationLevel.set_connection_isolation_level ActiveRecord::Base.connection
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