69 lines
1.9 KiB
Ruby
69 lines
1.9 KiB
Ruby
require_relative '../../migration_helpers'
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module RuboCop
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module Cop
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module Migration
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# This cop checks for `add_column_with_default` on a table that's been
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# explicitly blacklisted because of its size.
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#
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# Even though this helper performs the update in batches to avoid
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# downtime, using it with tables with millions of rows still causes a
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# significant delay in the deploy process and is best avoided.
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#
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# See https://gitlab.com/gitlab-com/infrastructure/issues/1602 for more
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# information.
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class UpdateLargeTable < RuboCop::Cop::Cop
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include MigrationHelpers
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MSG = 'Using `%s` on the `%s` table will take a long time to ' \
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'complete, and should be avoided unless absolutely ' \
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'necessary'.freeze
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LARGE_TABLES = %i[
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ci_build_trace_sections
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ci_builds
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ci_job_artifacts
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ci_pipelines
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ci_stages
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events
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issues
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merge_request_diff_commits
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merge_request_diff_files
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merge_request_diffs
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merge_requests
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namespaces
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notes
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projects
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routes
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users
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].freeze
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BATCH_UPDATE_METHODS = %w[
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:add_column_with_default
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:change_column_type_concurrently
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:rename_column_concurrently
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:update_column_in_batches
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].join(' ').freeze
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def_node_matcher :batch_update?, <<~PATTERN
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(send nil? ${#{BATCH_UPDATE_METHODS}} $(sym ...) ...)
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PATTERN
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def on_send(node)
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return unless in_migration?(node)
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matches = batch_update?(node)
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return unless matches
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update_method = matches.first
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table = matches.last.to_a.first
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return unless LARGE_TABLES.include?(table)
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add_offense(node, location: :expression, message: format(MSG, update_method, table))
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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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