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# frozen_string_literal: true
module Database
module MultipleDatabasesHelpers
def skip_if_multiple_databases_not_setup
skip 'Skipping because multiple databases not set up' unless Gitlab::Database.has_config?(:ci)
end
def skip_if_multiple_databases_are_setup
skip 'Skipping because multiple databases are set up' if Gitlab::Database.has_config?(:ci)
end
def reconfigure_db_connection(name: nil, config_hash: {}, model: ActiveRecord::Base, config_model: nil)
db_config = (config_model || model).connection_db_config
new_db_config = ActiveRecord::DatabaseConfigurations::HashConfig.new(
db_config.env_name,
name ? name.to_s : db_config.name,
db_config.configuration_hash.merge(config_hash)
)
model.establish_connection(new_db_config)
end
def ensure_schema_and_empty_tables
# Ensure all schemas for both databases are migrated back
Gitlab::Database.database_base_models.each do |_, base_model|
with_reestablished_active_record_base do
reconfigure_db_connection(
model: ActiveRecord::Base,
config_model: base_model
)
delete_from_all_tables!(except: deletion_except_tables)
schema_migrate_up!
end
end
# ActiveRecord::Base.clear_all_connections! disconnects and clears attribute methods
# Force a refresh to avoid schema failures.
reset_column_in_all_models
refresh_attribute_methods
end
# The usage of this method switches temporarily used `connection_handler`
# allowing full manipulation of ActiveRecord::Base connections without
# having side effects like:
# - misaligned transactions since this is managed by `BeforeAllAdapter`
# - removal of primary connections
#
# The execution within a block ensures safe cleanup of all allocated resources.
#
# rubocop:disable Database/MultipleDatabases
def with_reestablished_active_record_base(reconnect: true)
connection_classes = ActiveRecord::Base
.connection_handler
.connection_pool_names
.map(&:constantize)
.index_with(&:connection_db_config)
original_handler = ActiveRecord::Base.connection_handler
new_handler = ActiveRecord::ConnectionAdapters::ConnectionHandler.new
ActiveRecord::Base.connection_handler = new_handler
connection_classes.each { |klass, db_config| klass.establish_connection(db_config) } if reconnect
yield
ensure
ActiveRecord::Base.connection_handler = original_handler
new_handler&.clear_all_connections!
end
# rubocop:enable Database/MultipleDatabases
def with_added_ci_connection
if Gitlab::Database.has_config?(:ci)
# No need to add a ci: connection if we already have one
yield
else
with_reestablished_active_record_base(reconnect: true) do
reconfigure_db_connection(
name: :ci,
model: Ci::ApplicationRecord,
config_model: ActiveRecord::Base
)
yield
# Cleanup connection_specification_name for Ci::ApplicationRecord
Ci::ApplicationRecord.remove_connection
end
end
end
end
module ActiveRecordBaseEstablishConnection
def establish_connection(*args)
# rubocop:disable Database/MultipleDatabases
if connected? &&
connection&.transaction_open? &&
ActiveRecord::Base.connection_handler == ActiveRecord::Base.default_connection_handler
raise "Cannot re-establish '#{self}.establish_connection' within an open transaction " \
"(#{connection&.open_transactions.to_i}). Use `with_reestablished_active_record_base` " \
"instead or add `:reestablished_active_record_base` to rspec context."
end
# rubocop:enable Database/MultipleDatabases
super
end
end
end
ActiveRecord::Base.singleton_class.prepend(::Database::ActiveRecordBaseEstablishConnection) # rubocop:disable Database/MultipleDatabases
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