# frozen_string_literal: true # Copyright (c) 2018 Yegor Bugayenko # # 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 NONINFINGEMENT. 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. require 'tempfile' require 'openssl' require_relative '../log' require_relative '../size' require_relative '../wallet' # The entrance that ignores duplicates. # Author:: Yegor Bugayenko (yegor256@gmail.com) # Copyright:: Copyright (c) 2018 Yegor Bugayenko # License:: MIT module Zold # The safe entrance class NoDupEntrance def initialize(entrance, wallets, log: Log::Quiet.new) @entrance = entrance @wallets = wallets @log = log end def start raise 'Block must be given to start()' unless block_given? @entrance.start { yield(self) } end def to_json @entrance.to_json end # Returns a list of modifed wallets (as Zold::Id) def push(id, body) before = @wallets.acq(id) { |w| w.exists? ? w.digest : '' } after = OpenSSL::Digest::SHA256.new(body).hexdigest if before == after @log.debug("Duplicate of #{id} ignored (#{Size.new(body.length)} bytes)") return [] end @log.debug("New content for #{id} arrived (#{Size.new(body.length)} bytes)") @entrance.push(id, body) end end end