102 lines
3.4 KiB
Ruby
102 lines
3.4 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Partitioning
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class SlidingListStrategy
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attr_reader :model, :partitioning_key, :next_partition_if, :detach_partition_if
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delegate :table_name, to: :model
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def initialize(model, partitioning_key, next_partition_if:, detach_partition_if:)
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@model = model
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@partitioning_key = partitioning_key
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@next_partition_if = next_partition_if
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@detach_partition_if = detach_partition_if
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ensure_partitioning_column_ignored!
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end
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def current_partitions
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Gitlab::Database::PostgresPartition.for_parent_table(table_name).map do |partition|
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SingleNumericListPartition.from_sql(table_name, partition.name, partition.condition)
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end.sort
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end
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def missing_partitions
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if no_partitions_exist?
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[initial_partition]
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elsif next_partition_if.call(active_partition.value)
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[next_partition]
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else
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[]
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end
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end
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def initial_partition
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SingleNumericListPartition.new(table_name, 1)
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end
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def next_partition
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SingleNumericListPartition.new(table_name, active_partition.value + 1)
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end
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def extra_partitions
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possibly_extra = current_partitions[0...-1] # Never consider the most recent partition
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extra = possibly_extra.take_while { |p| detach_partition_if.call(p.value) }
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default_value = current_default_value
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if extra.any? { |p| p.value == default_value }
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Gitlab::AppLogger.error(message: "Inconsistent partition detected: partition with value #{current_default_value} should not be deleted because it's used as the default value.",
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partition_number: current_default_value,
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table_name: model.table_name)
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extra = extra.reject { |p| p.value == default_value }
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end
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extra
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end
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def after_adding_partitions
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active_value = active_partition.value
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model.connection.change_column_default(model.table_name, partitioning_key, active_value)
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end
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def active_partition
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# The current partitions list is sorted, so the last partition has the highest value
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# This is the only partition that receives inserts.
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current_partitions.last
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end
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def no_partitions_exist?
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current_partitions.empty?
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end
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private
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def current_default_value
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column_name = model.connection.quote(partitioning_key)
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table_name = model.connection.quote(model.table_name)
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value = model.connection.select_value <<~SQL
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SELECT columns.column_default AS default_value
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FROM information_schema.columns columns
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WHERE columns.column_name = #{column_name} AND columns.table_name = #{table_name}
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SQL
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raise "No default value found for the #{partitioning_key} column within #{model.name}" if value.nil?
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Integer(value)
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end
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def ensure_partitioning_column_ignored!
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unless model.ignored_columns.include?(partitioning_key.to_s)
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raise "Add #{partitioning_key} to #{model.name}.ignored_columns to use it with SlidingListStrategy"
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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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end
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