Class: Zold::Patch

Inherits:
Object
  • Object
show all
Defined in:
lib/zold/patch.rb

Overview

A patch

Instance Method Summary collapse

Constructor Details

#initialize(log: Log::Quiet.new) ⇒ Patch

Returns a new instance of Patch.



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# File 'lib/zold/patch.rb', line 34

def initialize(log: Log::Quiet.new)
  @log = log
end

Instance Method Details

#join(wallet) ⇒ Object 



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# File 'lib/zold/patch.rb', line 43

def join(wallet)
  if @id.nil?
    @id = wallet.id
    @key = wallet.key
    @txns = wallet.txns
    @log.debug("The baseline: #{@txns.count} transactions, the balance is #{wallet.balance}")
    @network = wallet.network
  end
  if wallet.network != @network
    raise "The wallet is from a different network '#{wallet.network}', ours is '#{@network}'"
  end
  raise 'Public key mismatch' if wallet.key != @key
  raise "Wallet ID mismatch: #{@id} != #{wallet.id}" if wallet.id != @id
  negative = @txns.select { |t| t.amount.negative? }
  max = negative.empty? ? 0 : negative.max_by(&:id).id
  wallet.txns.each do |txn|
    next if @txns.find { |t| t == txn }
    if txn.amount.negative?
      if txn.id <= max
        @log.debug("Transaction ID is less than max #{max}: #{txn.to_text}")
        next
      end
      if @txns.find { |t| t.id == txn.id }
        @log.debug("Transaction ##{txn.id} already exists: #{txn.to_text}")
        next
      end
      if !@txns.empty? && @txns.map(&:amount).inject(&:+) < txn.amount
        @log.debug("Transaction ##{txn.id} attempts to make the balance negative: #{txn.to_text}")
        next
      end
      unless Signature.new.valid?(@key, wallet.id, txn)
        @log.debug("Invalid RSA signature at transaction ##{txn.id} of #{wallet.id}: #{txn.to_text}")
        next
      end
    elsif !txn.sign.nil? && !txn.sign.empty?
      @log.debug("RSA signature is redundant at ##{txn.id} of #{wallet.id}: #{txn.to_text}")
      next
    end
    @log.debug("Merged on top: #{txn.to_text}")
    @txns << txn
  end
end

#save(file, overwrite: false) ⇒ Object

Returns TRUE if the file was actually modified



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# File 'lib/zold/patch.rb', line 87

def save(file, overwrite: false)
  raise 'You have to join at least one wallet in' if @id.nil?
  before = ''
  before = AtomicFile.new(file).read if File.exist?(file)
  wallet = Wallet.new(file)
  wallet.init(@id, @key, overwrite: overwrite, network: @network)
  @txns.each { |t| wallet.add(t) }
  after = AtomicFile.new(file).read
  before != after
end

#to_s ⇒ Object 



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# File 'lib/zold/patch.rb', line 38

def to_s
  return 'empty' if @id.nil?
  "#{@txns.count} txns"
end