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