Source code for the custom Mastodon (Glitchsoc) instance on berserker.town.
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100 lines
3.1 KiB
100 lines
3.1 KiB
# frozen_string_literal: true
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class Importer::BaseImporter
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# @param [Integer] batch_size
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# @param [Concurrent::ThreadPoolExecutor] executor
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def initialize(batch_size:, executor:)
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@batch_size = batch_size
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@executor = executor
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@wait_for = Concurrent::Set.new
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end
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# Callback to run when a concurrent work unit completes
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# @param [Proc]
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def on_progress(&block)
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@on_progress = block
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end
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# Callback to run when a concurrent work unit fails
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# @param [Proc]
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def on_failure(&block)
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@on_failure = block
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end
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# Reduce resource usage during and improve speed of indexing
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def optimize_for_import!
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Chewy.client.indices.put_settings index: index.index_name, body: { index: { refresh_interval: -1 } }
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end
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# Restore original index settings
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def optimize_for_search!
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Chewy.client.indices.put_settings index: index.index_name, body: { index: { refresh_interval: index.settings_hash[:settings][:index][:refresh_interval] } }
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end
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# Estimate the amount of documents that would be indexed. Not exact!
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# @returns [Integer]
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def estimate!
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reltuples = ActiveRecord::Base.connection_pool.with_connection { |connection| connection.select_one("SELECT reltuples FROM pg_class WHERE relname = '#{index.adapter.target.table_name}'")['reltuples'].to_i }
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# If the table has never yet been vacuumed or analyzed, reltuples contains -1
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[reltuples, 0].max
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end
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# Import data from the database into the index
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def import!
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raise NotImplementedError
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end
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# Remove documents from the index that no longer exist in the database
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def clean_up!
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index.scroll_batches do |documents|
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primary_key = index.adapter.target.primary_key
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raise ActiveRecord::UnknownPrimaryKey, index.adapter.target if primary_key.nil?
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ids = documents.pluck('_id')
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existence_map = index.adapter.target.where(primary_key => ids).pluck(primary_key).each_with_object({}) { |id, map| map[id.to_s] = true }
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tmp = ids.reject { |id| existence_map[id] }
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next if tmp.empty?
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in_work_unit(tmp) do |deleted_ids|
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bulk = Chewy::Index::Import::BulkBuilder.new(index, delete: deleted_ids).bulk_body
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Chewy::Index::Import::BulkRequest.new(index).perform(bulk)
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[0, bulk.size]
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end
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end
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wait!
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end
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protected
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def build_bulk_body(to_import)
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# Specialize `Chewy::Index::Import::BulkBuilder#bulk_body` to avoid a few
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# inefficiencies, as none of our fields or join fields and we do not need
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# `BulkBuilder`'s versatility.
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crutches = Chewy::Index::Crutch::Crutches.new index, to_import
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to_import.map { |object| { index: { _id: object.id, data: index.compose(object, crutches, fields: []) } } }
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end
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def in_work_unit(...)
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work_unit = Concurrent::Promises.future_on(@executor, ...)
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work_unit.on_fulfillment!(&@on_progress)
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work_unit.on_rejection!(&@on_failure)
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work_unit.on_resolution! { @wait_for.delete(work_unit) }
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@wait_for << work_unit
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rescue Concurrent::RejectedExecutionError
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sleep(0.1) && retry # Backpressure
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end
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def wait!
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Concurrent::Promises.zip(*@wait_for).wait
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end
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def index
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raise NotImplementedError
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end
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end
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