134 lines
3.1 KiB
Ruby
134 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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require "weakref"
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module Scheduler
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module Deferrable
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DEFAULT_TIMEOUT ||= 90
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STATS_CACHE_SIZE ||= 100
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def initialize
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@async = !Rails.env.test?
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@queue = Queue.new
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@mutex = Mutex.new
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@stats_mutex = Mutex.new
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@paused = false
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@thread = nil
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@reactor = nil
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@timeout = DEFAULT_TIMEOUT
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@stats = LruRedux::ThreadSafeCache.new(STATS_CACHE_SIZE)
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end
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def timeout=(t)
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@mutex.synchronize { @timeout = t }
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end
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def length
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@queue.length
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end
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def stats
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@stats_mutex.synchronize { @stats.to_a }
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end
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def pause
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stop!
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@paused = true
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end
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def resume
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@paused = false
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end
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# for test and sidekiq
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def async=(val)
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@async = val
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end
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def later(desc = nil, db = RailsMultisite::ConnectionManagement.current_db, &blk)
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@stats_mutex.synchronize do
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stats = (@stats[desc] ||= { queued: 0, finished: 0, duration: 0, errors: 0 })
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stats[:queued] += 1
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end
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if @async
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start_thread if !@thread&.alive? && !@paused
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@queue << [db, blk, desc]
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else
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blk.call
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end
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end
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def stop!
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@thread.kill if @thread&.alive?
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@thread = nil
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@reactor&.stop
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@reactor = nil
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end
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# test only
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def stopped?
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!@thread&.alive?
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end
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def do_all_work
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do_work(_non_block = true) while !@queue.empty?
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end
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private
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def start_thread
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@mutex.synchronize do
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@reactor = MessageBus::TimerThread.new if !@reactor
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@thread =
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Thread.new do
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@thread.abort_on_exception = true if Rails.env.test?
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do_work while true
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end if !@thread&.alive?
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end
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end
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# using non_block to match Ruby #deq
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def do_work(non_block = false)
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db, job, desc = @queue.deq(non_block)
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start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
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db ||= RailsMultisite::ConnectionManagement::DEFAULT
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RailsMultisite::ConnectionManagement.with_connection(db) do
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begin
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warning_job =
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@reactor.queue(@timeout) do
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Rails.logger.error "'#{desc}' is still running after #{@timeout} seconds on db #{db}, this process may need to be restarted!"
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end if !non_block
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job.call
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rescue => ex
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@stats_mutex.synchronize do
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stats = @stats[desc]
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stats[:errors] += 1 if stats
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end
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Discourse.handle_job_exception(ex, message: "Running deferred code '#{desc}'")
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ensure
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warning_job&.cancel
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end
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end
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rescue => ex
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Discourse.handle_job_exception(ex, message: "Processing deferred code queue")
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ensure
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ActiveRecord::Base.connection_handler.clear_active_connections!
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if start
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@stats_mutex.synchronize do
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stats = @stats[desc]
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if stats
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stats[:finished] += 1
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stats[:duration] += Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
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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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class Defer
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extend Deferrable
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initialize
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end
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end
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