Class: OnChain::Sweeper

Inherits:
Object
  • Object
show all
Defined in:
lib/onchain/sweeper.rb

Class Method Summary collapse

Class Method Details

.create_payment_tx_from_sweep(incoming, destination_address, mpks) ⇒ Object 



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# File 'lib/onchain/sweeper.rb', line 101

def create_payment_tx_from_sweep(incoming, destination_address, mpks)
    
  tx = Bitcoin::Protocol::Tx.new
  total_amount = 0
    
  incoming.each do |output|
    
    txin = Bitcoin::Protocol::TxIn.new
    
    rs = generate_redemption_script_from_mpks(mpks, output[1])

    txin.prev_out = OnChain.hex_to_bin(output[3]).reverse
    txin.prev_out_index = output[4]
    txin.script = OnChain.hex_to_bin(rs)

    tx.add_in(txin)
    
    total_amount = total_amount + output[2].to_i
    
  end
  
  total_amount = total_amount - 10000
  
  if total_amount < 0
    return "Not enough coins to create a transaction."
  end
  
  # Add an output and we're done.
  txout = Bitcoin::Protocol::TxOut.new(total_amount, 
    Bitcoin::Script.to_address_script(destination_address))
  
  tx.add_out(txout)
  
  paths = incoming.map { |i| i[1] }
  
  return OnChain.bin_to_hex(tx.to_payload), paths
end

.generate_address_of_redemption_script(redemption_script) ⇒ Object 



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# File 'lib/onchain/sweeper.rb', line 43

def generate_address_of_redemption_script(redemption_script)
  hash160 = Bitcoin.hash160(redemption_script)

  return Bitcoin.hash160_to_p2sh_address(hash160)
end

.generate_redemption_script(addresses) ⇒ Object 



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# File 'lib/onchain/sweeper.rb', line 27

def generate_redemption_script(addresses)

  rs = (80 + addresses.length).to_s(16) 

  addresses.each do |address|
    rs = rs + (address.length / 2).to_s(16)
    rs = rs + address
  end

  rs = rs + (80 + addresses.length).to_s(16) 

  rs = rs + 'ae'

  return rs
end

.generate_redemption_script_from_mpks(mpks, path) ⇒ Object 



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# File 'lib/onchain/sweeper.rb', line 15

def generate_redemption_script_from_mpks(mpks, path)
  
  addresses = []
  mpks.each do |mpk|
    master = MoneyTree::Node.from_serialized_address(mpk)
    m = master.node_for_path(path)
    addresses << m.public_key.to_hex
  end
  
  return generate_redemption_script(addresses)
end

.get_block_height ⇒ Object 



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# File 'lib/onchain/sweeper.rb', line 49

def get_block_height
  return Chain.get_latest_block["height"].to_i
end

.multi_sig_address_from_mpks(mpks, path) ⇒ Object

Turn a bunch of master keys into a redemption scriopt i.e. derive the path.



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# File 'lib/onchain/sweeper.rb', line 8

def multi_sig_address_from_mpks(mpks, path)
  
  rs = generate_redemption_script_from_mpks(mpks, path)
  
  return generate_address_of_redemption_script(rs)
end

.post_tx_for_signing(tx_hex, paths) ⇒ Object 



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# File 'lib/onchain/sweeper.rb', line 139

def post_tx_for_signing(tx_hex, paths)
  
  meta = ''
  if paths != nil
    paths.each do |path|
      meta = meta + path
    end
  end
  
  return HTTParty.post('https://onchain.herokuapp.com/api/v1/transaction', 
    :body => { :tx => tx_hex, 
    :meta_data => meta,
    :user_email => ENV['ONCHAIN_EMAIL'],
    :user_token => ENV['ONCHAIN_TOKEN'] }) 
end

.sweep(mpks, path, limit, last_block_checked) ⇒ Object

With a bunch of HD wallet paths, build a transaction That pays all the coins to a certain address



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# File 'lib/onchain/sweeper.rb', line 55

def sweep(mpks, path, limit, last_block_checked)
  
  block_height_now = get_block_height
  
  to_sweep = {}
  # Get all the addresses we are interested in.
  for i in 0..limit do
    r = path.sub('#{index}', i.to_s)
    a = multi_sig_address_from_mpks(mpks, r)
    # store address as lookup for path.
    to_sweep[a] = r
  end
  
  incoming_coins = []
  
  to_sweep.each do |address, path|
    
    txs = Chain.get_address_transactions(address)
    
    txs.each do |tx|
      
      block_height = tx["block_height"].to_i 
      if block_height > last_block_checked
        
        tx["outputs"].each do |output|
          output["addresses"].each do |address|
            if to_sweep[address] != nil
              incoming_coins << [address, 
                to_sweep[address], 
                output["value"], 
                output["transaction_hash"], 
                output["output_index"], 
                output["script"]]
            end
          end
        end
        
      else
        break
      end
      
    end
  end
  return incoming_coins, block_height_now
end