text: #!/usr/bin/env python3
  # Copyright (c) 2014-2018 The Pocketcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test the -alertnotify, -blocknotify and -walletnotify options."""
  import os
  
  from test_framework.test_framework import PocketcoinTestFramework
  from test_framework.util import assert_equal, wait_until, connect_nodes_bi
  
  class NotificationsTest(PocketcoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 2
          self.setup_clean_chain = True
  
      def skip_test_if_missing_module(self):
          self.skip_if_no_wallet()
  
      def setup_network(self):
          self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
          self.block_filename = os.path.join(self.options.tmpdir, "blocks.txt")
          self.tx_filename = os.path.join(self.options.tmpdir, "transactions.txt")
  
          # -alertnotify and -blocknotify on node0, walletnotify on node1
          self.extra_args = [["-blockversion=2",
                              "-alertnotify=echo %%s >> %s" % self.alert_filename,
                              "-blocknotify=echo %%s >> %s" % self.block_filename],
                             ["-blockversion=211",
                              "-rescan",
                              "-walletnotify=echo %%s >> %s" % self.tx_filename]]
          super().setup_network()
  
      def run_test(self):
          self.log.info("test -blocknotify")
          block_count = 10
          blocks = self.nodes[1].generate(block_count)
  
          # wait at most 10 seconds for expected file size before reading the content
          wait_until(lambda: os.path.isfile(self.block_filename) and os.stat(self.block_filename).st_size >= (block_count * 65), timeout=10)
  
          # file content should equal the generated blocks hashes
          with open(self.block_filename, 'r', encoding="utf-8") as f:
              assert_equal(sorted(blocks), sorted(l.strip() for l in f.read().splitlines()))
  
          self.log.info("test -walletnotify")
          # wait at most 10 seconds for expected file size before reading the content
          wait_until(lambda: os.path.isfile(self.tx_filename) and os.stat(self.tx_filename).st_size >= (block_count * 65), timeout=10)
  
          # file content should equal the generated transaction hashes
          txids_rpc = list(map(lambda t: t['txid'], self.nodes[1].listtransactions("*", block_count)))
          with open(self.tx_filename, 'r', encoding="ascii") as f:
              assert_equal(sorted(txids_rpc), sorted(l.strip() for l in f.read().splitlines()))
          os.remove(self.tx_filename)
  
          self.log.info("test -walletnotify after rescan")
          # restart node to rescan to force wallet notifications
          self.restart_node(1)
          connect_nodes_bi(self.nodes, 0, 1)
  
          wait_until(lambda: os.path.isfile(self.tx_filename) and os.stat(self.tx_filename).st_size >= (block_count * 65), timeout=10)
  
          # file content should equal the generated transaction hashes
          txids_rpc = list(map(lambda t: t['txid'], self.nodes[1].listtransactions("*", block_count)))
          with open(self.tx_filename, 'r', encoding="ascii") as f:
              assert_equal(sorted(txids_rpc), sorted(l.strip() for l in f.read().splitlines()))
  
          # Mine another 41 up-version blocks. -alertnotify should trigger on the 51st.
          self.log.info("test -alertnotify")
          self.nodes[1].generate(41)
          self.sync_all()
  
          # Give pocketcoind 10 seconds to write the alert notification
          wait_until(lambda: os.path.isfile(self.alert_filename) and os.path.getsize(self.alert_filename), timeout=10)
  
          with open(self.alert_filename, 'r', encoding='utf8') as f:
              alert_text = f.read()
  
          # Mine more up-version blocks, should not get more alerts:
          self.nodes[1].generate(2)
          self.sync_all()
  
          with open(self.alert_filename, 'r', encoding='utf8') as f:
              alert_text2 = f.read()
  
          self.log.info("-alertnotify should not continue notifying for more unknown version blocks")
          assert_equal(alert_text, alert_text2)
  
  if __name__ == '__main__':
      NotificationsTest().main()
  