lib/zold/node/nodup_entrance.rb
# frozen_string_literal: true
# Copyright (c) 2018-2023 Zerocracy
#
# 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 entrance that ignores dups
class NoDupEntrance
def initialize(entrance, wallets, log: Log::NULL)
@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)}")
return []
end
@log.debug("New content for #{id} arrived #{Size.new(body.length)}")
@entrance.push(id, body)
end
end
end