Class: BTC::Validation

Inherits:
Object
  • Object
show all
Defined in:
lib/btcruby/validation.rb

Instance Method Summary collapse

Constructor Details

#initialize(max_block_size: MAX_BLOCK_SIZE, min_coinbase_size: 2, max_coinbase_size: 100, max_money: MAX_MONEY) ⇒ Validation

Returns a new instance of Validation.



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# File 'lib/btcruby/validation.rb', line 14

def initialize(
    max_block_size: MAX_BLOCK_SIZE,
    min_coinbase_size: 2,
    max_coinbase_size: 100,
    max_money: MAX_MONEY
  )
  @max_block_size = max_block_size
  @min_coinbase_size = min_coinbase_size
  @max_coinbase_size = max_coinbase_size
  @max_money = max_money
end

Instance Method Details

#check_money_range(value) ⇒ Object 



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# File 'lib/btcruby/validation.rb', line 79

def check_money_range(value)
  value >= 0 && value <= @max_money
end

#check_transaction(tx, state) ⇒ Object 



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# File 'lib/btcruby/validation.rb', line 26

def check_transaction(tx, state)
  # Basic checks that don't depend on any context
  if tx.inputs.empty?
    return state.DoS(10, false, REJECT_INVALID, "bad-txns-vin-empty")
  end
  if tx.outputs.empty?
    return state.DoS(10, false, REJECT_INVALID, "bad-txns-vout-empty")
  end

  # Size limits
  if tx.data.bytesize > @max_block_size
    return state.DoS(100, false, REJECT_INVALID, "bad-txns-oversize")
  end

  # Check for negative or overflow output values
  tx.outputs.inject(0) do |total, txout|
    if txout.value < 0
      return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-negative")
    end
    if txout.value > @max_money
      return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-toolarge")
    end
    total += txout.value
    if !check_money_range(total)
      return state.DoS(100, false, REJECT_INVALID, "bad-txns-txouttotal-toolarge")
    end
    total
  end

  # Check for duplicate inputs
  used_outpoints = {} # outpoint => true
  tx.inputs.each do |txin|
    if used_outpoints[txin.outpoint]
      return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputs-duplicate")
    end
    used_outpoints[txin.outpoint] = true
  end

  if tx.coinbase?
    cb_size = tx.inputs[0].coinbase_data.bytesize
    if cb_size < @min_coinbase_size || cb_size > @max_coinbase_size
      return state.DoS(100, false, REJECT_INVALID, "bad-cb-length")
    end
  else
    tx.inputs.each do |txin|
      if txin.outpoint.null?
        return state.DoS(10, false, REJECT_INVALID, "bad-txns-prevout-null")
      end
    end
  end
  return true
end