Class: OpenAssets::Protocol::MarkerOutput

Inherits:
Object
  • Object
show all
Extended by:
Util
Includes:
Util
Defined in:
lib/openassets/protocol/marker_output.rb

Constant Summary collapse

MAX_ASSET_QUANTITY = 
2 ** 63 -1
OAP_MARKER =

A tag indicating thath this transaction is an Open Assets transaction.

"4f41"
VERSION =

The major revision number of the Open Assets Protocol.(1=0x0100)

"0100"

Constants included from Util

Util::OA_NAMESPACE, Util::OA_VERSION_BYTE, Util::OA_VERSION_BYTE_TESTNET

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Util

address_to_oa_address, coin_to_satoshi, decode_leb128, encode_leb128, generate_asset_id, hash_to_asset_id, oa_address_to_address, pubkey_hash_to_asset_id, read_leb128, read_var_integer, satoshi_to_coin, script_to_address, script_to_asset_id, to_bytes, valid_asset_id?, validate_address

Constructor Details

#initialize(asset_quantities, metadata = '') ⇒ MarkerOutput

Returns a new instance of MarkerOutput.

Parameters:

  • asset_quantities (Array) —

    The asset quantity array

  • metadata (String) (defaults to: '') —

    The metadata in the marker output.



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# File 'lib/openassets/protocol/marker_output.rb', line 21

def initialize(asset_quantities, metadata = '')
  @asset_quantities = asset_quantities
  @metadata = metadata
end

Instance Attribute Details

#asset_quantities ⇒ Object

Returns the value of attribute asset_quantities.



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# File 'lib/openassets/protocol/marker_output.rb', line 16

def asset_quantities
  @asset_quantities
end

#metadata ⇒ Object

Returns the value of attribute metadata.



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# File 'lib/openassets/protocol/marker_output.rb', line 17

def metadata
  @metadata
end

Class Method Details

.deserialize_payload(payload) ⇒ OpenAssets::Protocol::MarkerOutput

Deserialize the marker output payload.

Parameters:

  • payload (String) —

    The Open Assets Payload.

Returns:



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# File 'lib/openassets/protocol/marker_output.rb', line 43

def self.deserialize_payload(payload)
  return nil unless valid?(payload)
  payload = payload[8..-1] # exclude OAP_MARKER,VERSION
  asset_quantity, payload = parse_asset_qty(payload)
  list = to_bytes(payload).map{|x|(x.to_i(16)>=128 ? x : x+"|")}.join.split('|')[0..(asset_quantity - 1)].join
  asset_quantities = decode_leb128(list)
  meta = to_bytes(payload[list.size..-1])
  metadata =  meta.empty? ? '' : meta[1..-1].map{|x|x.to_i(16).chr}.join
  new(asset_quantities, metadata)
end

.parse_script(output_script) ⇒ String

Parses an output and returns the payload if the output matches the right pattern for a marker output,

Parameters:

  • output_script: (Bitcoin::Script) —

    The output script to be parsed.

Returns:

  • (String) —

    The byte string of the marker output payload if the output fits the pattern, nil otherwise.



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# File 'lib/openassets/protocol/marker_output.rb', line 57

def self.parse_script(output_script)
  data = Bitcoin::Script.new(output_script).get_op_return_data
  return data if valid?(data)
end

Instance Method Details

#build_script ⇒ Bitcoin::Script

Creates an output script containing an OP_RETURN and a PUSHDATA from payload.

Returns:

  • (Bitcoin::Script) —

    the output script.



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# File 'lib/openassets/protocol/marker_output.rb', line 64

def build_script
  Bitcoin::Script.from_string("OP_RETURN #{to_payload}")
end

#to_payload ⇒ String

Serialize the marker output into a Open Assets Payload buffer.

Returns:

  • (String) —

    The serialized payload.



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# File 'lib/openassets/protocol/marker_output.rb', line 28

def to_payload
  payload = [OAP_MARKER, VERSION]
  asset_quantity_count = Bitcoin::Protocol.pack_var_int(@asset_quantities.length).unpack("H*")
  payload << sort_count(asset_quantity_count[0])
  @asset_quantities.map{|q|payload << encode_leb128(q)}
  @metadata ||= ''
  metadata_length = Bitcoin::Protocol.pack_var_int(@metadata.length).unpack("H*")
  payload << sort_count(metadata_length[0])
  payload << @metadata.bytes.map{|b| sprintf("%02x", b)}.join
  payload.join
end