Class: Zold::Patch

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

Overview

A patch

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of Patch.



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

def initialize(wallets, log: Log::Quiet.new)
  raise 'Wallets can\'t be nil' if wallets.nil?
  raise 'Wallets must be of type Wallets' unless wallets.is_a?(Wallets)
  @wallets = wallets
  @txns = []
  @log = log
end

Instance Method Details

#join(wallet, baseline = true) ⇒ Object 



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# File 'lib/zold/patch.rb', line 47

def join(wallet, baseline = true)
  if @id.nil?
    @id = wallet.id
    @key = wallet.key
    if baseline
      @txns = wallet.txns
      @log.debug("The baseline: #{@txns.count} transactions, the balance is #{wallet.balance}")
    else
      @log.debug("The baseline of #{@txns.count} transactions ignored")
    end
    @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
  wallet.txns.each do |txn|
    next if @txns.find { |t| t == txn }
    if txn.amount.negative?
      dup = @txns.find { |t| t.id == txn.id && t.amount.negative? }
      if dup
        @log.error("An attempt to overwrite #{dup.to_text} with this: #{txn.to_text}")
        next
      end
      balance = @txns.map(&:amount).map(&:to_i).inject(&:+).to_i
      if balance < txn.amount.to_i * -1 && !wallet.root?
        @log.error("Transaction ##{txn.id} attempts to make the balance of \
#{wallet.id}/#{Amount.new(coins: balance).to_zld}/#{@txns.size} negative: #{txn.to_text}")
        next
      end
      unless Signature.new.valid?(@key, wallet.id, txn)
        @log.error("Invalid RSA signature at transaction ##{txn.id} of #{wallet.id}: #{txn.to_text}")
        next
      end
    else
      if !txn.sign.nil? && !txn.sign.empty?
        @log.error("RSA signature is redundant at ##{txn.id} of #{wallet.id}: #{txn.to_text}")
        next
      end
      payer = @wallets.find(txn.bnf)
      unless payer.exists?
        @log.error("Paying wallet #{wallet.id} is absent at ##{txn.id}: #{txn.to_text}")
        next
      end
      unless payer.has?(txn.id, wallet.id)
        @log.error("Paying wallet #{txn.bnf} doesn't have transaction ##{txn.id} \
among #{payer.txns.count} transactions: #{txn.to_text}")
        next
      end
    end
    @txns << txn
    @log.debug("Merged on top, balance is #{@txns.map(&:amount).inject(&:+)}: #{txn.to_text}")
  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 104

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 42

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