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 128

def empty?
  @id.nil?
end

#join(wallet, baseline: true, legacy: false) ⇒ Object 



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

def join(wallet, baseline: true, legacy: false)
  if @id.nil?
    @id = wallet.id
    @key = wallet.key
    if baseline
      @txns = wallet.txns
      @log.debug("The baseline of #{wallet.id} is #{wallet.balance}/#{@txns.count}t")
    else
      @log.debug("The baseline of #{@txns.count} transactions ignored")
    end
    @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 legacy && (txn.amount.positive? || txn.date > Time.now - 24 * 60 * 60)
    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
      unless @wallets.acq(txn.bnf, &:exists?)
        if block_given?
          yield(txn.bnf)
          unless @wallets.acq(txn.bnf, &:exists?)
            @log.error("Paying wallet #{txn.bnf} file is absent even after PULL: \"#{txn.to_text}\"")
            next
          end
        else
          @log.error("Paying wallet #{txn.bnf} file is absent and it's a \"shallow\" MERGE: #{txn.to_text}")
          next
        end
      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
    @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 133

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