text: #!/usr/bin/env python3
  # Copyright (c) 2014-2017 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test the wallet keypool and interaction with wallet encryption/locking."""
  
  from test_framework.test_framework import FuncTestFramework
  from test_framework.util import *
  
  class KeyPoolTest(FuncTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.extra_args = [['-keypool=1']]
  
      def run_test(self):
          nodes = self.nodes
          addr_before_encrypting = nodes[0].getnewaddress()
          addr_before_encrypting_data = nodes[0].validateaddress(addr_before_encrypting)
  
          # Encrypt wallet and wait to terminate
          nodes[0].node_encrypt_wallet('test')
          # Restart node 0
          self.start_node(0, self.extra_args[0])
          # Keep creating keys
          addr = nodes[0].getnewaddress()
          addr_data = nodes[0].validateaddress(addr)
          assert_raises_rpc_error(-12, "Keypool ran out, please call keypoolrefill first, or unlock the wallet.",
                                  nodes[0].getnewaddress)
  
          # put six (plus 2) new keys in the keypool (100% external-, +100% internal-keys, 1 in min)
          nodes[0].walletpassphrase('test', 12000)
          nodes[0].keypoolrefill(6)
          nodes[0].walletlock()
          wi = nodes[0].getwalletinfo()
          assert_equal(wi['keypoolsize_hd_internal'], 6)
          assert_equal(wi['keypoolsize'], 6)
  
          # drain the internal keys
          nodes[0].getrawchangeaddress()
          nodes[0].getrawchangeaddress()
          nodes[0].getrawchangeaddress()
          nodes[0].getrawchangeaddress()
          nodes[0].getrawchangeaddress()
          nodes[0].getrawchangeaddress()
          addr = set()
          # the next one should fail
          assert_raises_rpc_error(-12, "Keypool ran out", nodes[0].getrawchangeaddress)
  
          # drain the external keys
          addr.add(nodes[0].getnewaddress())
          addr.add(nodes[0].getnewaddress())
          addr.add(nodes[0].getnewaddress())
          addr.add(nodes[0].getnewaddress())
          addr.add(nodes[0].getnewaddress())
          addr.add(nodes[0].getnewaddress())
          assert len(addr) == 6
          # the next one should fail
          assert_raises_rpc_error(-12, "Keypool ran out, please call keypoolrefill first, or unlock the wallet.",
                                  nodes[0].getnewaddress)
  
          # refill keypool with three new addresses
          nodes[0].walletpassphrase('test', 1)
          nodes[0].keypoolrefill(3)
  
          # test walletpassphrase timeout
          time.sleep(1.1)
          assert_equal(nodes[0].getwalletinfo()["unlocked_until"], 0)
  
          # drain the keypool
          for _ in range(3):
              nodes[0].getnewaddress()
          assert_raises_rpc_error(-12, "Keypool ran out", nodes[0].getnewaddress)
  
          nodes[0].walletpassphrase('test', 100)
          nodes[0].keypoolrefill(100)
          wi = nodes[0].getwalletinfo()
          assert_equal(wi['keypoolsize_hd_internal'], 100)
          assert_equal(wi['keypoolsize'], 100)
  
  if __name__ == '__main__':
      KeyPoolTest().main()
  