64 lines
1.9 KiB
Ruby
64 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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class Mastodon::SidekiqMiddleware
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BACKTRACE_LIMIT = 3
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def call(*, &block)
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Chewy.strategy(:mastodon, &block)
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rescue Mastodon::HostValidationError
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# Do not retry
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rescue => e
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clean_up_elasticsearch_connections!
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limit_backtrace_and_raise(e)
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ensure
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clean_up_sockets!
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end
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private
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def limit_backtrace_and_raise(exception)
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exception.set_backtrace(exception.backtrace.first(BACKTRACE_LIMIT)) unless ENV['BACKTRACE']
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raise exception
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end
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def clean_up_sockets!
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clean_up_redis_socket!
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clean_up_statsd_socket!
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end
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# This is a hack to immediately free up unused Elasticsearch connections.
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#
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# Indeed, Chewy creates one `Elasticsearch::Client` instance per thread,
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# and each such client manages its long-lasting connection to
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# Elasticsearch.
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#
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# As far as I know, neither `chewy`, `elasticsearch-transport` or even
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# `faraday` provide a reliable way to immediately close a connection, and
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# rely on the underlying object to be garbage-collected instead.
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#
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# Furthermore, `sidekiq` creates a new thread each time a job throws an
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# exception, meaning that each failure will create a new connection, and
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# the old one will only be closed on full garbage collection.
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def clean_up_elasticsearch_connections!
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return unless Chewy.enabled? && Chewy.current[:chewy_client].present?
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Chewy.client.transport.transport.connections.each do |connection|
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# NOTE: This bit of code is tailored for the HTTPClient Faraday adapter
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connection.connection.app.instance_variable_get(:@client)&.reset_all
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end
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Chewy.current.delete(:chewy_client)
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rescue
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nil
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end
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def clean_up_redis_socket!
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RedisConnection.pool.checkin if Thread.current[:redis]
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Thread.current[:redis] = nil
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end
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def clean_up_statsd_socket!
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Thread.current[:statsd_socket]&.close
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Thread.current[:statsd_socket] = nil
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end
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end
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