text: #!/usr/bin/env python3
  # Copyright (c) 2017-2019 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Tests NODE_NETWORK_LIMITED.
  
  Tests that a node configured with -prune=550 signals NODE_NETWORK_LIMITED correctly
  and that it responds to getdata requests for blocks correctly:
      - send a block within 288 + 2 of the tip
      - disconnect peers who request blocks older than that."""
  from test_framework.messages import CInv, MSG_BLOCK, msg_getdata, msg_verack, NODE_NETWORK_LIMITED, NODE_WITNESS
  from test_framework.p2p import P2PInterface
  from test_framework.test_framework import AgroCoinTestFramework
  from test_framework.util import (
      assert_equal,
  )
  
  
  class P2PIgnoreInv(P2PInterface):
      firstAddrnServices = 0
      def on_inv(self, message):
          # The node will send us invs for other blocks. Ignore them.
          pass
      def on_addr(self, message):
          self.firstAddrnServices = message.addrs[0].nServices
      def wait_for_addr(self, timeout=5):
          test_function = lambda: self.last_message.get("addr")
          self.wait_until(test_function, timeout=timeout)
      def send_getdata_for_block(self, blockhash):
          getdata_request = msg_getdata()
          getdata_request.inv.append(CInv(MSG_BLOCK, int(blockhash, 16)))
          self.send_message(getdata_request)
  
  class NodeNetworkLimitedTest(AgroCoinTestFramework):
      def set_test_params(self):
          self.setup_clean_chain = True
          self.num_nodes = 3
          self.extra_args = [['-prune=550', '-addrmantest'], [], []]
  
      def disconnect_all(self):
          self.disconnect_nodes(0, 1)
          self.disconnect_nodes(0, 2)
          self.disconnect_nodes(1, 2)
  
      def setup_network(self):
          self.add_nodes(self.num_nodes, self.extra_args)
          self.start_nodes()
  
      def run_test(self):
          node = self.nodes[0].add_p2p_connection(P2PIgnoreInv())
  
          expected_services = NODE_WITNESS | NODE_NETWORK_LIMITED
  
          self.log.info("Check that node has signalled expected services.")
          assert_equal(node.nServices, expected_services)
  
          self.log.info("Check that the localservices is as expected.")
          assert_equal(int(self.nodes[0].getnetworkinfo()['localservices'], 16), expected_services)
  
          self.log.info("Mine enough blocks to reach the NODE_NETWORK_LIMITED range.")
          self.connect_nodes(0, 1)
          blocks = self.nodes[1].generatetoaddress(292, self.nodes[1].get_deterministic_priv_key().address)
          self.sync_blocks([self.nodes[0], self.nodes[1]])
  
          self.log.info("Make sure we can max retrieve block at tip-288.")
          node.send_getdata_for_block(blocks[1])  # last block in valid range
          node.wait_for_block(int(blocks[1], 16), timeout=3)
  
          self.log.info("Requesting block at height 2 (tip-289) must fail (ignored).")
          node.send_getdata_for_block(blocks[0])  # first block outside of the 288+2 limit
          node.wait_for_disconnect(5)
  
          self.log.info("Check local address relay, do a fresh connection.")
          self.nodes[0].disconnect_p2ps()
          node1 = self.nodes[0].add_p2p_connection(P2PIgnoreInv())
          node1.send_message(msg_verack())
  
          node1.wait_for_addr()
          #must relay address with NODE_NETWORK_LIMITED
          assert_equal(node1.firstAddrnServices, expected_services)
  
          self.nodes[0].disconnect_p2ps()
  
          # connect unsynced node 2 with pruned NODE_NETWORK_LIMITED peer
          # because node 2 is in IBD and node 0 is a NODE_NETWORK_LIMITED peer, sync must not be possible
          self.connect_nodes(0, 2)
          try:
              self.sync_blocks([self.nodes[0], self.nodes[2]], timeout=5)
          except:
              pass
          # node2 must remain at height 0
          assert_equal(self.nodes[2].getblockheader(self.nodes[2].getbestblockhash())['height'], 0)
  
          # now connect also to node 1 (non pruned)
          self.connect_nodes(1, 2)
  
          # sync must be possible
          self.sync_blocks()
  
          # disconnect all peers
          self.disconnect_all()
  
          # mine 10 blocks on node 0 (pruned node)
          self.nodes[0].generatetoaddress(10, self.nodes[0].get_deterministic_priv_key().address)
  
          # connect node1 (non pruned) with node0 (pruned) and check if the can sync
          self.connect_nodes(0, 1)
  
          # sync must be possible, node 1 is no longer in IBD and should therefore connect to node 0 (NODE_NETWORK_LIMITED)
          self.sync_blocks([self.nodes[0], self.nodes[1]])
  
  if __name__ == '__main__':
      NodeNetworkLimitedTest().main()
  