71 lines
2.3 KiB
Ruby
71 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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module Database
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module DatabaseHelpers
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# In order to directly work with views using factories,
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# we can swapout the view for a table of identical structure.
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def swapout_view_for_table(view, connection: nil)
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connection ||= ActiveRecord::Base.connection
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connection.execute(<<~SQL.squish)
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CREATE TABLE #{view}_copy (LIKE #{view});
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DROP VIEW #{view};
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ALTER TABLE #{view}_copy RENAME TO #{view};
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SQL
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end
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# Set statement timeout temporarily.
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# Useful when testing query timeouts.
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#
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# Note that this method cannot restore the timeout if a query
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# was canceled due to e.g. a statement timeout.
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# Refrain from using this transaction in these situations.
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#
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# @param timeout - Statement timeout in seconds
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#
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# Example:
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#
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# with_statement_timeout(0.1) do
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# model.select('pg_sleep(0.11)')
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# end
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def with_statement_timeout(timeout)
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# Force a positive value and a minimum of 1ms for very small values.
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timeout = (timeout * 1000).abs.ceil
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raise ArgumentError, 'Using a timeout of `0` means to disable statement timeout.' if timeout == 0
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previous_timeout = ActiveRecord::Base.connection
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.exec_query('SHOW statement_timeout')[0].fetch('statement_timeout')
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set_statement_timeout("#{timeout}ms")
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yield
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ensure
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begin
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set_statement_timeout(previous_timeout)
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rescue ActiveRecord::StatementInvalid
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# After a transaction was canceled/aborted due to e.g. a statement
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# timeout commands are ignored and will raise in PG::InFailedSqlTransaction.
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# We can safely ignore this error because the statement timeout was set
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# for the currrent transaction which will be closed anyway.
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end
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end
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# Set statement timeout for the current transaction.
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#
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# Note, that it does not restore the previous statement timeout.
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# Use `with_statement_timeout` instead.
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#
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# @param timeout - Statement timeout in seconds
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#
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# Example:
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#
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# set_statement_timeout(0.1)
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# model.select('pg_sleep(0.11)')
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def set_statement_timeout(timeout)
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ActiveRecord::Base.connection.execute(
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format(%(SET LOCAL statement_timeout = '%s'), timeout)
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)
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end
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end
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end
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