lib/zold/head.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_relative 'txn'
# Head of a wallet.
# Author:: Yegor Bugayenko (yegor256@gmail.com)
# Copyright:: Copyright (c) 2018 Yegor Bugayenko
# License:: MIT
module Zold
# Head of the wallet.
class Head
# When can't parse them.
class CantParse < StandardError; end
def initialize(file)
@file = file
end
def flush
# nothing
end
def fetch
raise "Wallet file '#{@file}' is absent" unless File.exist?(@file)
lines = []
File.open(@file) do |f|
lines << f.readline.strip while lines.count < 4 && !f.eof?
end
raise CantParse, "Not enough lines in #{@file}, just #{lines.count}" if lines.count < 4
lines
end
end
# Cached head.
# Author:: Yegor Bugayenko (yegor256@gmail.com)
# Copyright:: Copyright (c) 2018 Yegor Bugayenko
# License:: MIT
class CachedHead
def initialize(head)
@head = head
end
def flush
@fetch = nil
end
def fetch
@fetch ||= @head.fetch
end
end
end