Class: Dropzone::BitcoinConnection

Inherits:
Object
  • Object
show all
Defined in:
lib/dropzone/connection.rb

Defined Under Namespace

Classes: WalletFundsTooLowOrNoUTXOs

Constant Summary collapse

SATOSHIS_IN_BTC = 
100_000_000
TXO_DUST =

0.0000543 BTC

5430
PREFIX = 
'DZ'

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(network, options = {}) ⇒ BitcoinConnection 



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# File 'lib/dropzone/connection.rb', line 13

def initialize(network, options = {})
  @network = network
  @bitcoin = options[:bitcoin] if options.has_key? :bitcoin
  @is_testing = (/\Atestnet/.match network.to_s) ? true : false
  @bitcoin ||= BlockrIo.new is_testing?
end

Class Attribute Details

.cache ⇒ Object

This is a hook to speed up some operations via a local cache



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# File 'lib/dropzone/connection.rb', line 310

def cache
  @cache
end

Instance Attribute Details

#bitcoin ⇒ Object (readonly)

Returns the value of attribute bitcoin.



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# File 'lib/dropzone/connection.rb', line 11

def bitcoin
  @bitcoin
end

Instance Method Details

#block_height ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 191

def block_height
  bitcoin.getblockinfo('last')['nb']
end

#hash160_from_address(addr) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 32

def hash160_from_address(addr)
  set_network_mode!
  Bitcoin.hash160_from_address addr
end

#hash160_to_address(hash160) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 27

def hash160_to_address(hash160) 
  set_network_mode!
  Bitcoin.hash160_to_address hash160
end

#is_testing? ⇒ Boolean 



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# File 'lib/dropzone/connection.rb', line 20

def is_testing?; @is_testing; end

#messages_by_addr(addr, options = {}) ⇒ Object

NOTE:

- This needs to return the messages in Descending order by block
  In the case that two transactions are in the same block, it goes by time
- This should only 'valid' return messages. Not transactions



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# File 'lib/dropzone/connection.rb', line 46

def messages_by_addr(addr, options = {})
  ret = cache.listtransactions addr, true, is_testing? if cache

  unless ret
    ret = bitcoin.listtransactions addr, true
    cache.listtransactions! addr, true, ret, is_testing? if cache
  end

  ret = ret.collect{ |tx_h|
    begin
      msg = Dropzone::MessageBase.new_message_from tx_by_id(tx_h['tx'])

      (msg && msg.valid?) ? msg : nil
    rescue Counterparty::TxDecode::InvalidOutput,
      Counterparty::TxDecode::MultisigUnsupported,
      Counterparty::TxDecode::UndefinedBehavior
      next
    end
  }.compact

  filter_messages ret, options
end

#messages_in_block(at_height, options = {}) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 69

def messages_in_block(at_height, options = {})
  ret = bitcoin.getblock(at_height).collect{ |tx_h|

    # This is a speed hack that drastically reduces query times:
    next if options[:type] == 'ITCRTE' && !tx_h_create?(tx_h)

    begin
      msg = Dropzone::MessageBase.new_message_from tx_by_id( tx_h['tx'], 
        block_height: at_height )

      (msg && msg.valid?) ? msg : nil
    rescue Counterparty::TxDecode::InvalidOutput,
      Counterparty::TxDecode::MultisigUnsupported,
      Counterparty::TxDecode::UndefinedBehavior,
      Counterparty::TxDecode::InvalidOpReturn
      next
    end
  }.compact

  filter_messages ret, options
end

#privkey_to_addr(key) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 22

def privkey_to_addr(key) 
  set_network_mode!
  Bitcoin::Key.from_base58(key).addr
end

#save!(data, private_key_wif) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 156

def save!(data, private_key_wif)
  set_network_mode!

  from_key = Bitcoin::Key.from_base58 private_key_wif
  
  # We need to know how many transactions we'll have in order to know how
  # many satoshi's to allocate. We start with 1, since that's the return
  # address of the allocated input satoshis
  data_outputs_needed = 1

  bytes_in_output = Counterparty::TxEncode::BYTES_IN_MULTISIG

  # 3 is for the two-byte DZ prefix, and the 1-byte length
  data_outputs_needed += ((data[:data].length+3) / bytes_in_output).ceil

  # We'll need a P2PSH for the destination if that applies
  data_outputs_needed += 1 if data.has_key? :receiver_addr
  tip = data[:tip] || 0

  new_tx = create_tx(from_key,data_outputs_needed * TXO_DUST+tip) do |tx, amount_allocated|
    outputs = Counterparty::TxEncode.new( 
      [tx.inputs[0].prev_out.reverse_hth].pack('H*'),
      data[:data], receiver_addr: data[:receiver_addr],
      sender_pubkey: from_key.pub, prefix: PREFIX).to_opmultisig

    outputs.each_with_index do |output,i|
      tx.add_out Bitcoin::P::TxOut.new( (i == (outputs.length-1)) ? 
        (amount_allocated - tip - TXO_DUST*(outputs.length - 1)) : TXO_DUST,
        Bitcoin::Script.binary_from_string(output) )
    end
  end

  sign_and_send new_tx, from_key
end

#send_value(from_key, to_addr, send_satoshis, tip_satoshis) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 91

def send_value(from_key, to_addr, send_satoshis, tip_satoshis)
  set_network_mode!

  new_tx = create_tx(from_key, send_satoshis+tip_satoshis){ |tx, allocated|
    [ [send_satoshis, Bitcoin.hash160_from_address(to_addr)],
      [(allocated-send_satoshis-tip_satoshis), from_key.hash160]
    ].each do |(amt, to)|
      tx.add_out Bitcoin::P::TxOut.new( amt,
        Bitcoin::Script.to_hash160_script(to) )
    end
  }

  sign_and_send new_tx, from_key
end

#sign_tx(tx, key) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 106

def sign_tx(tx, key)
  set_network_mode!

  # Sign the transaction:
  tx.inputs.length.times do |i|
    # Fetch the previous input:
    prev_out_tx_hash = tx.inputs[i].prev_out.reverse.unpack('H*').first
    prev_tx_raw = bitcoin.getrawtransaction(prev_out_tx_hash)['hex']
    prev_tx = Bitcoin::P::Tx.new [prev_tx_raw].pack('H*')
    
    # Now we actually sign
    sig = Bitcoin.sign_data Bitcoin.open_key(key.priv), 
      tx.signature_hash_for_input(i, prev_tx)
    tx.in[i].script_sig = Bitcoin::Script.to_signature_pubkey_script( sig, 
      [key.pub].pack("H*"))
  end
  tx
end

#tx_by_id(id, options = {}) ⇒ Object 



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# File 'lib/dropzone/connection.rb', line 125

def tx_by_id(id, options = {})
  set_network_mode!

  ret = cache.tx_by_id id, is_testing? if cache

  unless ret
    tx_h = bitcoin.getrawtransaction(id)
    tx = Bitcoin::P::Tx.new [tx_h['hex']].pack('H*')

    if tx_h.has_key? 'blockhash'
      options[:block_height] = bitcoin.getblockinfo(tx_h['blockhash'])['nb']
    end

    record = Counterparty::TxDecode.new tx,
      prefix: Dropzone::BitcoinConnection::PREFIX

    ret = options.merge({ data: record.data, 
      receiver_addr: record.receiver_addr, 
      txid: id,
      sender_addr: record.sender_addr})

    # NOTE that in the case of a reorg, this might have incorrect block
    # heights cached. It's probable that we can/should cache these, and 
    # merely set the block height when it's confirmed, and/or set the
    # height to current_height+1
    cache.tx_by_id! id, ret, is_testing? if cache && options[:block_height]
  end

  ret
end

#valid_address?(addr) ⇒ Boolean 



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# File 'lib/dropzone/connection.rb', line 37

def valid_address?(addr) 
  set_network_mode!
  Bitcoin.valid_address? addr
end