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* Add request pool to improve delivery performance Fix #7909 * Ensure connection is closed when exception interrupts execution * Remove Timeout#timeout from socket connection * Fix infinite retrial loop on HTTP::ConnectionError * Close sockets on failure, reduce idle time to 90 seconds * Add MAX_REQUEST_POOL_SIZE option to limit concurrent connections to the same server * Use a shared pool size, 512 by default, to stay below open file limit * Add some tests * Add more tests * Reduce MAX_IDLE_TIME from 90 to 30 seconds, reap every 30 seconds * Use a shared pool that returns preferred connection but re-purposes other ones when needed * Fix wrong connection being returned on subsequent calls within the same thread * Reduce mutex calls on flushes from 2 to 1 and add test for reaping
115 lines
2.4 KiB
Ruby
115 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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require_relative './connection_pool/shared_connection_pool'
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class RequestPool
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def self.current
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@current ||= RequestPool.new
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end
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class Reaper
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attr_reader :pool, :frequency
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def initialize(pool, frequency)
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@pool = pool
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@frequency = frequency
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end
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def run
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return unless frequency&.positive?
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Thread.new(frequency, pool) do |t, p|
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loop do
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sleep t
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p.flush
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end
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end
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end
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end
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MAX_IDLE_TIME = 30
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WAIT_TIMEOUT = 5
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MAX_POOL_SIZE = ENV.fetch('MAX_REQUEST_POOL_SIZE', 512).to_i
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class Connection
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attr_reader :site, :last_used_at, :created_at, :in_use, :dead, :fresh
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def initialize(site)
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@site = site
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@http_client = http_client
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@last_used_at = nil
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@created_at = current_time
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@dead = false
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@fresh = true
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end
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def use
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@last_used_at = current_time
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@in_use = true
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retries = 0
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begin
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yield @http_client
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rescue HTTP::ConnectionError
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# It's possible the connection was closed, so let's
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# try re-opening it once
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close
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if @fresh || retries.positive?
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raise
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else
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@http_client = http_client
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retries += 1
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retry
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end
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rescue StandardError
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# If this connection raises errors of any kind, it's
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# better if it gets reaped as soon as possible
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close
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@dead = true
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raise
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end
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ensure
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@fresh = false
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@in_use = false
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end
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def seconds_idle
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current_time - (@last_used_at || @created_at)
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end
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def close
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@http_client.close
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end
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private
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def http_client
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Request.http_client.persistent(@site, timeout: MAX_IDLE_TIME)
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end
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def current_time
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Process.clock_gettime(Process::CLOCK_MONOTONIC)
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end
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end
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def initialize
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@pool = ConnectionPool::SharedConnectionPool.new(size: MAX_POOL_SIZE, timeout: WAIT_TIMEOUT) { |site| Connection.new(site) }
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@reaper = Reaper.new(self, 30)
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@reaper.run
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end
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def with(site, &block)
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@pool.with(site) do |connection|
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ActiveSupport::Notifications.instrument('with.request_pool', miss: connection.fresh, host: connection.site) do
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connection.use(&block)
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end
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end
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end
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delegate :size, :flush, to: :@pool
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end
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