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# frozen_string_literal: true
module Gitlab
module Database
module SchemaHelpers
def create_trigger_function(name, replace: true)
replace_clause = optional_clause(replace, "OR REPLACE")
execute(<<~SQL)
CREATE #{replace_clause} FUNCTION #{name}()
RETURNS TRIGGER AS
$$
BEGIN
#{yield}
END
$$ LANGUAGE PLPGSQL
SQL
end
def function_exists?(name)
connection.select_value("SELECT 1 FROM pg_proc WHERE proname = '#{name}'")
end
def create_trigger(table_name, name, function_name, fires:)
execute(<<~SQL)
CREATE TRIGGER #{name}
#{fires} ON #{table_name}
FOR EACH ROW
#{yield if block_given?}
EXECUTE FUNCTION #{function_name}()
SQL
end
def trigger_exists?(table_name, name)
connection.select_value(<<~SQL)
SELECT 1
FROM pg_catalog.pg_trigger trgr
INNER JOIN pg_catalog.pg_class rel
ON trgr.tgrelid = rel.oid
INNER JOIN pg_catalog.pg_namespace nsp
ON nsp.oid = rel.relnamespace
WHERE nsp.nspname = #{connection.quote(current_schema)}
AND rel.relname = #{connection.quote(table_name)}
AND trgr.tgname = #{connection.quote(name)}
SQL
end
def drop_function(name, if_exists: true)
exists_clause = optional_clause(if_exists, "IF EXISTS")
execute("DROP FUNCTION #{exists_clause} #{name}()")
end
def drop_trigger(table_name, name, if_exists: true)
exists_clause = optional_clause(if_exists, "IF EXISTS")
execute("DROP TRIGGER #{exists_clause} #{name} ON #{table_name}")
end
def create_comment(type, name, text)
execute("COMMENT ON #{type} #{name} IS '#{text}'")
end
def tmp_table_name(base)
hashed_base = Digest::SHA256.hexdigest(base).first(10)
"#{base}_#{hashed_base}"
end
def object_name(table, type)
identifier = "#{table}_#{type}"
hashed_identifier = Digest::SHA256.hexdigest(identifier).first(10)
"#{type}_#{hashed_identifier}"
end
def with_lock_retries(*args, **kwargs, &block)
raise_on_exhaustion = !!kwargs.delete(:raise_on_exhaustion)
merged_args = {
connection: connection,
klass: self.class,
logger: Gitlab::BackgroundMigration::Logger,
allow_savepoints: true
}.merge(kwargs)
Gitlab::Database::WithLockRetries.new(**merged_args)
.run(raise_on_exhaustion: raise_on_exhaustion, &block)
end
def assert_not_in_transaction_block(scope:)
return unless transaction_open?
raise "#{scope} operations can not be run inside a transaction block, " \
"you can disable transaction blocks by calling disable_ddl_transaction! " \
"in the body of your migration class"
end
private
def table_for_range_partition(partition_name)
"#{Gitlab::Database::DYNAMIC_PARTITIONS_SCHEMA}.#{partition_name}"
end
def create_range_partition(partition_name, table_name, lower_bound, upper_bound)
execute(<<~SQL)
CREATE TABLE #{table_for_range_partition(partition_name)} PARTITION OF #{table_name}
FOR VALUES FROM (#{lower_bound}) TO (#{upper_bound})
SQL
end
def optional_clause(flag, clause)
flag ? clause : ""
end
end
end
end
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