debian-mirror-gitlab/lib/gitlab/database/load_balancing.rb

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# frozen_string_literal: true
module Gitlab
module Database
module LoadBalancing
# The exceptions raised for connection errors.
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CONNECTION_ERRORS = [
PG::ConnectionBad,
PG::ConnectionDoesNotExist,
PG::ConnectionException,
PG::ConnectionFailure,
PG::UnableToSend,
# During a failover this error may be raised when
# writing to a primary.
PG::ReadOnlySqlTransaction,
# This error is raised when we can't connect to the database in the
# first place (e.g. it's offline or the hostname is incorrect).
ActiveRecord::ConnectionNotEstablished
].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
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?
each_load_balancer.all?(&:primary_only?)
end
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def self.release_hosts
each_load_balancer(&:release_host)
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end
DB_ROLES = [
ROLE_PRIMARY = :primary,
ROLE_REPLICA = :replica,
ROLE_UNKNOWN = :unknown
].freeze
# 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)
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
else
ROLE_PRIMARY
end
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end
end
end
end