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::NULL) ⇒ Patch

Returns a new instance of Patch.



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# File 'lib/zold/patch.rb', line 36

def initialize(wallets, log: Log::NULL)
  @wallets = wallets
  @txns = []
  @log = log
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zold/patch.rb', line 129

def empty?
  @id.nil?
end

#join(wallet) ⇒ Object

Joins a new wallet on top of existing patch. An attempt is made to copy as many transactions from the newcoming wallet to the existing set of transactions, avoiding mistakes and duplicates.



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# File 'lib/zold/patch.rb', line 61

def join(wallet)
  if @id.nil?
    @id = wallet.id
    @key = wallet.key
    @network = wallet.network
  end
  unless wallet.network == @network
    @log.error("The wallet is from a different network '#{wallet.network}', ours is '#{@network}'")
    return
  end
  unless wallet.key == @key
    @log.error('Public key mismatch')
    return
  end
  unless wallet.id == @id
    @log.error("Wallet ID mismatch, ours is #{@id}, theirs is #{wallet.id}")
    return
  end
  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 existing transaction \"#{dup.to_text}\" \
with a new one \"#{txn.to_text}\" from #{wallet.mnemo}")
        next
      end
      balance = @txns.map(&:amount).map(&:to_i).inject(&:+).to_i
      if balance < txn.amount.to_i * -1 && !wallet.root?
        @log.error("The transaction ##{txn.id} attempts to make the balance of \
#{wallet.id}/#{Amount.new(zents: balance).to_zld}/#{@txns.size} negative: \"#{txn.to_text}\"")
        next
      end
      unless Signature.new(@network).valid?(@key, wallet.id, txn)
        @log.error("Invalid RSA signature at the transaction ##{txn.id} of #{wallet.id}: \"#{txn.to_text}\"")
        next
      end
    else
      dup = @txns.find { |t| t.id == txn.id && t.bnf == txn.bnf && t.amount.positive? }
      if dup
        @log.error("Overwriting \"#{dup.to_text}\" with \"#{txn.to_text}\" from #{wallet.mnemo} (same ID/BNF)")
        next
      end
      if !txn.sign.nil? && !txn.sign.empty?
        @log.error("RSA signature is redundant at ##{txn.id} of #{wallet.id}: \"#{txn.to_text}\"")
        next
      end
      unless wallet.prefix?(txn.prefix)
        @log.error("Payment prefix '#{txn.prefix}' doesn't match with the key of #{wallet.id}: \"#{txn.to_text}\"")
        next
      end
      if !@wallets.acq(txn.bnf, &:exists?) && yield(txn)
        unless @wallets.acq(txn.bnf, &:exists?)
          @log.error("Paying wallet #{txn.bnf} file is absent even after PULL: \"#{txn.to_text}\"")
          next
        end
        unless @wallets.acq(txn.bnf) { |p| p.includes_negative?(txn.id, wallet.id) }
          @log.error("The beneficiary #{@wallets.acq(txn.bnf, &:mnemo)} of #{@id} \
doesn't have this transaction: \"#{txn.to_text}\"")
          next
        end
      end
    end
    @txns << txn
    @log.debug("Merged on top, balance is #{@txns.map(&:amount).inject(&:+)}: #{txn.to_text}")
  end
end

#legacy(wallet, hours: 24) ⇒ Object

Add legacy transactions first, since they are negative and can’t be deleted ever. This method is called by merge.rb in order to add legacy negative transactions to the patch before everything else. They are not supposed to be disputed, ever.



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# File 'lib/zold/patch.rb', line 51

def legacy(wallet, hours: 24)
  raise 'You can\'t add legacy to a non-empty patch' unless @id.nil?
  wallet.txns.each do |txn|
    @txns << txn if txn.amount.negative? && txn.date < Time.now - hours * 60 * 60
  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 134

def save(file, overwrite: false)
  raise 'You have to join at least one wallet in' if empty?
  before = ''
  before = OpenSSL::Digest::SHA256.file(file).hexdigest if File.exist?(file)
  wallet = Wallet.new(file)
  wallet.init(@id, @key, overwrite: overwrite, network: @network)
  File.open(file, 'a') do |f|
    @txns.each do |txn|
      f.print "#{txn}\n"
    end
  end
  wallet.refurbish
  after = OpenSSL::Digest::SHA256.file(file).hexdigest
  before != after
end

#to_s ⇒ Object 



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# File 'lib/zold/patch.rb', line 42

def to_s
  return 'nothing' if @txns.empty?
  "#{@txns.count} txns"
end