mastodon/app/lib/connection_pool/shared_connection_pool.rb

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# frozen_string_literal: true
require 'connection_pool'
require_relative './shared_timed_stack'
class ConnectionPool::SharedConnectionPool < ConnectionPool
def initialize(options = {}, &block)
super(options, &block)
@available = ConnectionPool::SharedTimedStack.new(@size, &block)
end
delegate :size, :flush, to: :@available
def with(preferred_tag, options = {})
Thread.handle_interrupt(Exception => :never) do
conn = checkout(preferred_tag, options)
begin
Thread.handle_interrupt(Exception => :immediate) do
yield conn
end
ensure
checkin(preferred_tag)
end
end
end
def checkout(preferred_tag, options = {})
if ::Thread.current[key(preferred_tag)]
::Thread.current[key_count(preferred_tag)] += 1
::Thread.current[key(preferred_tag)]
else
::Thread.current[key_count(preferred_tag)] = 1
::Thread.current[key(preferred_tag)] = @available.pop(preferred_tag, options[:timeout] || @timeout)
end
end
def checkin(preferred_tag)
if preferred_tag.is_a?(Hash) && preferred_tag[:force]
# ConnectionPool 2.4+ calls `checkin(force: true)` after fork.
# When this happens, we should remove all connections from Thread.current
::Thread.current.keys.each do |name| # rubocop:disable Style/HashEachMethods
next unless name.to_s.start_with?("#{@key}-")
@available.push(::Thread.current[name])
::Thread.current[name] = nil
end
elsif ::Thread.current[key(preferred_tag)]
if ::Thread.current[key_count(preferred_tag)] == 1
@available.push(::Thread.current[key(preferred_tag)])
::Thread.current[key(preferred_tag)] = nil
else
::Thread.current[key_count(preferred_tag)] -= 1
end
else
raise ConnectionPool::Error, 'no connections are checked out'
end
nil
end
private
def key(tag)
:"#{@key}-#{tag}"
end
def key_count(tag)
:"#{@key_count}-#{tag}"
end
end