deliver_tx.py

  def deliver_tx(self, tx):
      """Validate the transaction before mutating the state.
      Args:
          raw_tx: a raw string (in bytes) transaction.
      """
      parts = tx.split(b'=')
      if len(parts) == 2:
          key, value = parts[0], parts[1]
      else:
          key, value = tx
      self.state.db.set(prefix_key(key), value)
      self.state.size += 1
      return ResponseDeliverTx(code=CodeTypeOk)