text: #!/usr/bin/env python3
  # Copyright (c) 2015-2016 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  from test_framework.mininode import *
  from test_framework.test_framework import TenoCoinTestFramework
  from test_framework.util import *
  import time
  
  '''
  Test behavior of -maxuploadtarget.
  
  * Verify that getdata requests for old blocks (>1week) are dropped
  if uploadtarget has been reached.
  * Verify that getdata requests for recent blocks are respecteved even
  if uploadtarget has been reached.
  * Verify that the upload counters are reset after 24 hours.
  '''
  
  # TestNode: bare-bones "peer".  Used mostly as a conduit for a test to sending
  # p2p messages to a node, generating the messages in the main testing logic.
  class TestNode(NodeConnCB):
      def __init__(self):
          NodeConnCB.__init__(self)
          self.connection = None
          self.ping_counter = 1
          self.last_pong = msg_pong()
          self.block_receive_map = {}
  
      def add_connection(self, conn):
          self.connection = conn
          self.peer_disconnected = False
  
      def on_inv(self, conn, message):
          pass
  
      # Track the last getdata message we receive (used in the test)
      def on_getdata(self, conn, message):
          self.last_getdata = message
  
      def on_block(self, conn, message):
          message.block.calc_sha256()
          try:
              self.block_receive_map[message.block.sha256] += 1
          except KeyError as e:
              self.block_receive_map[message.block.sha256] = 1
  
      # Spin until verack message is received from the node.
      # We use this to signal that our test can begin. This
      # is called from the testing thread, so it needs to acquire
      # the global lock.
      def wait_for_verack(self):
          def veracked():
              return self.verack_received
          return wait_until(veracked, timeout=10)
  
      def wait_for_disconnect(self):
          def disconnected():
              return self.peer_disconnected
          return wait_until(disconnected, timeout=10)
  
      # Wrapper for the NodeConn's send_message function
      def send_message(self, message):
          self.connection.send_message(message)
  
      def on_pong(self, conn, message):
          self.last_pong = message
  
      def on_close(self, conn):
          self.peer_disconnected = True
  
      # Sync up with the node after delivery of a block
      def sync_with_ping(self, timeout=30):
          def received_pong():
              return (self.last_pong.nonce == self.ping_counter)
          self.connection.send_message(msg_ping(nonce=self.ping_counter))
          success = wait_until(received_pong, timeout)
          self.ping_counter += 1
          return success
  
  class MaxUploadTest(TenoCoinTestFramework):
   
      def add_options(self, parser):
          parser.add_option("--testbinary", dest="testbinary",
                            default=os.getenv("TENOCOIND", "tenocoind"),
                            help="tenocoind binary to test")
  
      def __init__(self):
          super().__init__()
          self.setup_clean_chain = True
          self.num_nodes = 1
  
          self.utxo = []
          self.txouts = gen_return_txouts()
  
      def setup_network(self):
          # Start a node with maxuploadtarget of 200 MB (/24h)
          self.nodes = []
          self.nodes.append(start_node(0, self.options.tmpdir, ["-debug", "-maxuploadtarget=800", "-blockmaxsize=999000"]))
  
      def mine_full_block(self, node, address):
          # Want to create a full block
          # We'll generate a 66k transaction below, and 14 of them is close to the 1MB block limit
          for j in range(14):
              if len(self.utxo) < 14:
                  self.utxo = node.listunspent()
              inputs=[]
              outputs = {}
              t = self.utxo.pop()
              inputs.append({ "txid" : t["txid"], "vout" : t["vout"]})
              remchange = t["amount"] - Decimal("0.001000")
              outputs[address]=remchange
              # Create a basic transaction that will send change back to ourself after account for a fee
              # And then insert the 128 generated transaction outs in the middle rawtx[92] is where the #
              # of txouts is stored and is the only thing we overwrite from the original transaction
              rawtx = node.createrawtransaction(inputs, outputs)
              newtx = rawtx[0:92]
              newtx = newtx + self.txouts
              newtx = newtx + rawtx[94:]
              # Appears to be ever so slightly faster to sign with SIGHASH_NONE
              signresult = node.signrawtransaction(newtx,None,None,"NONE")
              txid = node.sendrawtransaction(signresult["hex"], True)
          # Mine a full sized block which will be these transactions we just created
          node.generate(1)
  
      def run_test(self):
          # Before we connect anything, we first set the time on the node
          # to be in the past, otherwise things break because the CNode
          # time counters can't be reset backward after initialization
          old_time = int(time.time() - 2*60*60*24*7)
          self.nodes[0].setmocktime(old_time)
  
          # Generate some old blocks
          self.nodes[0].generate(130)
  
          # test_nodes[0] will only request old blocks
          # test_nodes[1] will only request new blocks
          # test_nodes[2] will test resetting the counters
          test_nodes = []
          connections = []
  
          for i in range(3):
              test_nodes.append(TestNode())
              connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[i]))
              test_nodes[i].add_connection(connections[i])
  
          NetworkThread().start() # Start up network handling in another thread
          [x.wait_for_verack() for x in test_nodes]
  
          # Test logic begins here
  
          # Now mine a big block
          self.mine_full_block(self.nodes[0], self.nodes[0].getnewaddress())
  
          # Store the hash; we'll request this later
          big_old_block = self.nodes[0].getbestblockhash()
          old_block_size = self.nodes[0].getblock(big_old_block, True)['size']
          big_old_block = int(big_old_block, 16)
  
          # Advance to two days ago
          self.nodes[0].setmocktime(int(time.time()) - 2*60*60*24)
  
          # Mine one more block, so that the prior block looks old
          self.mine_full_block(self.nodes[0], self.nodes[0].getnewaddress())
  
          # We'll be requesting this new block too
          big_new_block = self.nodes[0].getbestblockhash()
          new_block_size = self.nodes[0].getblock(big_new_block)['size']
          big_new_block = int(big_new_block, 16)
  
          # test_nodes[0] will test what happens if we just keep requesting the
          # the same big old block too many times (expect: disconnect)
  
          getdata_request = msg_getdata()
          getdata_request.inv.append(CInv(2, big_old_block))
  
          max_bytes_per_day = 800*1024*1024
          daily_buffer = 144 * 4000000
          max_bytes_available = max_bytes_per_day - daily_buffer
          success_count = max_bytes_available // old_block_size
  
          # 576MB will be reserved for relaying new blocks, so expect this to
          # succeed for ~235 tries.
          for i in range(success_count):
              test_nodes[0].send_message(getdata_request)
              test_nodes[0].sync_with_ping()
              assert_equal(test_nodes[0].block_receive_map[big_old_block], i+1)
  
          assert_equal(len(self.nodes[0].getpeerinfo()), 3)
          # At most a couple more tries should succeed (depending on how long 
          # the test has been running so far).
          for i in range(3):
              test_nodes[0].send_message(getdata_request)
          test_nodes[0].wait_for_disconnect()
          assert_equal(len(self.nodes[0].getpeerinfo()), 2)
          print("Peer 0 disconnected after downloading old block too many times")
  
          # Requesting the current block on test_nodes[1] should succeed indefinitely,
          # even when over the max upload target.
          # We'll try 800 times
          getdata_request.inv = [CInv(2, big_new_block)]
          for i in range(800):
              test_nodes[1].send_message(getdata_request)
              test_nodes[1].sync_with_ping()
              assert_equal(test_nodes[1].block_receive_map[big_new_block], i+1)
  
          print("Peer 1 able to repeatedly download new block")
  
          # But if test_nodes[1] tries for an old block, it gets disconnected too.
          getdata_request.inv = [CInv(2, big_old_block)]
          test_nodes[1].send_message(getdata_request)
          test_nodes[1].wait_for_disconnect()
          assert_equal(len(self.nodes[0].getpeerinfo()), 1)
  
          print("Peer 1 disconnected after trying to download old block")
  
          print("Advancing system time on node to clear counters...")
  
          # If we advance the time by 24 hours, then the counters should reset,
          # and test_nodes[2] should be able to retrieve the old block.
          self.nodes[0].setmocktime(int(time.time()))
          test_nodes[2].sync_with_ping()
          test_nodes[2].send_message(getdata_request)
          test_nodes[2].sync_with_ping()
          assert_equal(test_nodes[2].block_receive_map[big_old_block], 1)
  
          print("Peer 2 able to download old block")
  
          [c.disconnect_node() for c in connections]
  
          #stop and start node 0 with 1MB maxuploadtarget, whitelist 127.0.0.1
          print("Restarting nodes with -whitelist=127.0.0.1")
          stop_node(self.nodes[0], 0)
          self.nodes[0] = start_node(0, self.options.tmpdir, ["-debug", "-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
  
          #recreate/reconnect 3 test nodes
          test_nodes = []
          connections = []
  
          for i in range(3):
              test_nodes.append(TestNode())
              connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[i]))
              test_nodes[i].add_connection(connections[i])
  
          NetworkThread().start() # Start up network handling in another thread
          [x.wait_for_verack() for x in test_nodes]
  
          #retrieve 20 blocks which should be enough to break the 1MB limit
          getdata_request.inv = [CInv(2, big_new_block)]
          for i in range(20):
              test_nodes[1].send_message(getdata_request)
              test_nodes[1].sync_with_ping()
              assert_equal(test_nodes[1].block_receive_map[big_new_block], i+1)
  
          getdata_request.inv = [CInv(2, big_old_block)]
          test_nodes[1].send_message(getdata_request)
          test_nodes[1].wait_for_disconnect()
          assert_equal(len(self.nodes[0].getpeerinfo()), 3) #node is still connected because of the whitelist
  
          print("Peer 1 still connected after trying to download old block (whitelisted)")
  
          [c.disconnect_node() for c in connections]
  
  if __name__ == '__main__':
      MaxUploadTest().main()
  