# frozen_string_literal: true # Copyright, 2020, by Samuel G. D. Williams. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. module Async module HTTP module Cache module Store class Memory def initialize(limit: 1024) @index = {} @limit = limit @hit = 0 @miss = 0 @pruned = 0 @gardener = Async do |task| while true task.sleep(60) pruned = self.prune @pruned += pruned Async.logger.debug(self) do |buffer| if pruned > 0 buffer.puts "Pruned #{pruned} entries." end buffer.puts "Hits: #{@hit} Misses: #{@miss} Pruned: #{@pruned} Ratio: #{(100.0*@hit/@miss).round(2)}%" body_usage = @index.sum{|key, value| value.body.length} buffer.puts "Index size: #{@index.size} Memory usage: #{(body_usage / 1024.0**2).round(2)}MiB" # @index.each do |key, value| # buffer.puts "#{key.join('-')}: #{value.body.length}B" # end end end end end def close @gardener.stop end attr :index IF_NONE_MATCH = 'if-none-match' NOT_MODIFIED = ::Protocol::HTTP::Response[304] def lookup(key, request) if response = @index[key] if response.expired? @index.delete(key) @pruned += 1 return nil end if etags = request.headers[IF_NONE_MATCH] if etags.include?(response.etag) return NOT_MODIFIED end end @hit += 1 return response.dup else @miss += 1 return nil end end def insert(key, request, response) if @index.size < @limit length = response.body&.length if length.nil? or length < 1024*64 @index[key] = response end end end # @return [Integer] the number of pruned entries. def prune initial_count = @index.size @index.delete_if do |key, value| value.expired? end return initial_count - @index.size end end end end end end