Class: IOTA::Models::Bundle

Inherits:
Base
  • Object
show all
Defined in:
lib/iota/models/bundle.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#inspect, #symbolize_keys

Constructor Details

#initialize(transactions) ⇒ Bundle

Returns a new instance of Bundle.


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# File 'lib/iota/models/bundle.rb', line 6

def initialize(transactions)
  if transactions.class != Array
    raise StandardError, "Invalid transactions array"
  end

  @transactions = []
  transactions.each do |trx|
    trx = Transaction.new(trx) if trx.class != IOTA::Models::Transaction
    @transactions << trx
  end

  @persistence = @transactions.first.persistence
  @attachmentTimestamp = @transactions.first.attachmentTimestamp
end

Instance Attribute Details

#attachmentTimestampObject (readonly)

Returns the value of attribute attachmentTimestamp


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# File 'lib/iota/models/bundle.rb', line 4

def attachmentTimestamp
  @attachmentTimestamp
end

#persistenceObject (readonly)

Returns the value of attribute persistence


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# File 'lib/iota/models/bundle.rb', line 4

def persistence
  @persistence
end

#transactionsObject (readonly)

Returns the value of attribute transactions


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# File 'lib/iota/models/bundle.rb', line 4

def transactions
  @transactions
end

Instance Method Details

#extractJSONObject


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# File 'lib/iota/models/bundle.rb', line 21

def extractJSON
  utils = IOTA::Utils::Utils.new

  # Sanity check: if the first tryte pair is not opening bracket, it's not a message
  firstTrytePair = transactions[0].signatureMessageFragment[0] + transactions[0].signatureMessageFragment[1]

  return nil if firstTrytePair != "OD"

  index = 0
  notEnded = true
  trytesChunk = ''
  trytesChecked = 0
  preliminaryStop = false
  finalJson = ''

  while index < transactions.length && notEnded
    messageChunk = transactions[index].signatureMessageFragment

    # We iterate over the message chunk, reading 9 trytes at a time
    (0...messageChunk.length).step(9) do |i|
      # get 9 trytes
      trytes = messageChunk.slice(i, 9)
      trytesChunk += trytes

      # Get the upper limit of the tytes that need to be checked
      # because we only check 2 trytes at a time, there is sometimes a leftover
      upperLimit = trytesChunk.length - trytesChunk.length % 2

      trytesToCheck = trytesChunk[trytesChecked...upperLimit]

      # We read 2 trytes at a time and check if it equals the closing bracket character
      (0...trytesToCheck.length).step(2) do |j|
        trytePair = trytesToCheck[j] + trytesToCheck[j + 1]

        # If closing bracket char was found, and there are only trailing 9's
        # we quit and remove the 9's from the trytesChunk.
        if preliminaryStop && trytePair == '99'
          notEnded = false
          break
        end

        finalJson += utils.fromTrytes(trytePair)

        # If tryte pair equals closing bracket char, we set a preliminary stop
        # the preliminaryStop is useful when we have a nested JSON object
        if trytePair === "QD"
          preliminaryStop = true
        end
      end

      break if !notEnded

      trytesChecked += trytesToCheck.length;
    end

    # If we have not reached the end of the message yet, we continue with the next transaction in the bundle
    index += 1
  end

  # If we did not find any JSON, return nil
  return nil if notEnded

  finalJson
end