68 lines
1.9 KiB
Ruby
68 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module LoadBalancing
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# The exceptions raised for connection errors.
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CONNECTION_ERRORS = [
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PG::ConnectionBad,
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PG::ConnectionDoesNotExist,
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PG::ConnectionException,
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PG::ConnectionFailure,
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PG::UnableToSend,
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# During a failover this error may be raised when
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# writing to a primary.
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PG::ReadOnlySqlTransaction,
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# This error is raised when we can't connect to the database in the
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# first place (e.g. it's offline or the hostname is incorrect).
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ActiveRecord::ConnectionNotEstablished
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].freeze
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def self.base_models
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@base_models ||= ::Gitlab::Database.database_base_models_using_load_balancing.values.freeze
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end
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def self.each_load_balancer
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return to_enum(__method__) unless block_given?
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base_models.each do |model|
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yield model.load_balancer
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end
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end
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def self.primary_only?
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each_load_balancer.all?(&:primary_only?)
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end
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def self.primary?(name)
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each_load_balancer.find { |c| c.name == name }&.primary_only?
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end
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def self.release_hosts
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each_load_balancer(&:release_host)
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end
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DB_ROLES = [
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ROLE_PRIMARY = :primary,
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ROLE_REPLICA = :replica,
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ROLE_UNKNOWN = :unknown
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].freeze
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# Returns the role (primary/replica) of the database the connection is
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# connecting to.
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def self.db_role_for_connection(connection)
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return ROLE_UNKNOWN if connection.is_a?(::Gitlab::Database::LoadBalancing::ConnectionProxy)
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db_config = Database.db_config_for_connection(connection)
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return ROLE_UNKNOWN unless db_config
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if db_config.name.ends_with?(LoadBalancer::REPLICA_SUFFIX)
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ROLE_REPLICA
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else
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ROLE_PRIMARY
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end
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end
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end
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end
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end
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