diff --git a/test/functional/p2p-leaktests.py b/test/functional/p2p-leaktests.py
index b97eeefeb8..9ffbd1c8de 100755
--- a/test/functional/p2p-leaktests.py
+++ b/test/functional/p2p-leaktests.py
@@ -1,172 +1,170 @@
 #!/usr/bin/env python3
 # Copyright (c) 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 message sending before handshake completion.
 
 A node should never send anything other than VERSION/VERACK/REJECT until it's
 received a VERACK.
 
 This test connects to a node and sends it a few messages, trying to intice it
 into sending us something it shouldn't."""
 
 from test_framework.mininode import *
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 
 banscore = 10
 
 
 class CLazyNode(NodeConnCB):
     def __init__(self):
         super().__init__()
         self.unexpected_msg = False
         self.ever_connected = False
 
     def bad_message(self, message):
         self.unexpected_msg = True
         self.log.info("should not have received message: %s" % message.command)
 
     def on_open(self, conn):
         self.connected = True
         self.ever_connected = True
 
     def on_version(self, conn, message): self.bad_message(message)
 
     def on_verack(self, conn, message): self.bad_message(message)
 
     def on_reject(self, conn, message): self.bad_message(message)
 
     def on_inv(self, conn, message): self.bad_message(message)
 
     def on_addr(self, conn, message): self.bad_message(message)
 
-    def on_alert(self, conn, message): self.bad_message(message)
-
     def on_getdata(self, conn, message): self.bad_message(message)
 
     def on_getblocks(self, conn, message): self.bad_message(message)
 
     def on_tx(self, conn, message): self.bad_message(message)
 
     def on_block(self, conn, message): self.bad_message(message)
 
     def on_getaddr(self, conn, message): self.bad_message(message)
 
     def on_headers(self, conn, message): self.bad_message(message)
 
     def on_getheaders(self, conn, message): self.bad_message(message)
 
     def on_ping(self, conn, message): self.bad_message(message)
 
     def on_mempool(self, conn): self.bad_message(message)
 
     def on_pong(self, conn, message): self.bad_message(message)
 
     def on_feefilter(self, conn, message): self.bad_message(message)
 
     def on_sendheaders(self, conn, message): self.bad_message(message)
 
     def on_sendcmpct(self, conn, message): self.bad_message(message)
 
     def on_cmpctblock(self, conn, message): self.bad_message(message)
 
     def on_getblocktxn(self, conn, message): self.bad_message(message)
 
     def on_blocktxn(self, conn, message): self.bad_message(message)
 
 # Node that never sends a version. We'll use this to send a bunch of messages
 # anyway, and eventually get disconnected.
 
 
 class CNodeNoVersionBan(CLazyNode):
     # send a bunch of veracks without sending a message. This should get us disconnected.
     # NOTE: implementation-specific check here. Remove if bitcoind ban behavior changes
     def on_open(self, conn):
         super().on_open(conn)
         for i in range(banscore):
             self.send_message(msg_verack())
 
     def on_reject(self, conn, message): pass
 
 # Node that never sends a version. This one just sits idle and hopes to receive
 # any message (it shouldn't!)
 
 
 class CNodeNoVersionIdle(CLazyNode):
     def __init__(self):
         super().__init__()
 
 # Node that sends a version but not a verack.
 
 
 class CNodeNoVerackIdle(CLazyNode):
     def __init__(self):
         self.version_received = False
         super().__init__()
 
     def on_reject(self, conn, message): pass
 
     def on_verack(self, conn, message): pass
     # When version is received, don't reply with a verack. Instead, see if the
     # node will give us a message that it shouldn't. This is not an exhaustive
     # list!
 
     def on_version(self, conn, message):
         self.version_received = True
         conn.send_message(msg_ping())
         conn.send_message(msg_getaddr())
 
 
 class P2PLeakTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [['-banscore=' + str(banscore)]]
 
     def run_test(self):
         no_version_bannode = CNodeNoVersionBan()
         no_version_idlenode = CNodeNoVersionIdle()
         no_verack_idlenode = CNodeNoVerackIdle()
 
         connections = []
         connections.append(NodeConn('127.0.0.1', p2p_port(
             0), self.nodes[0], no_version_bannode, send_version=False))
         connections.append(NodeConn('127.0.0.1', p2p_port(
             0), self.nodes[0], no_version_idlenode, send_version=False))
         connections.append(NodeConn('127.0.0.1', p2p_port(0),
                                     self.nodes[0], no_verack_idlenode))
         no_version_bannode.add_connection(connections[0])
         no_version_idlenode.add_connection(connections[1])
         no_verack_idlenode.add_connection(connections[2])
 
         NetworkThread().start()  # Start up network handling in another thread
 
         wait_until(lambda: no_version_bannode.ever_connected,
                    timeout=10, lock=mininode_lock)
         wait_until(lambda: no_version_idlenode.ever_connected,
                    timeout=10, lock=mininode_lock)
         wait_until(lambda: no_verack_idlenode.version_received,
                    timeout=10, lock=mininode_lock)
 
         # Mine a block and make sure that it's not sent to the connected nodes
         self.nodes[0].generate(1)
 
         # Give the node enough time to possibly leak out a message
         time.sleep(5)
 
         # This node should have been banned
         assert not no_version_bannode.connected
 
         [conn.disconnect_node() for conn in connections]
 
         # Wait until all connections are closed
         wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 0)
 
         # Make sure no unexpected messages came in
         assert(no_version_bannode.unexpected_msg == False)
         assert(no_version_idlenode.unexpected_msg == False)
         assert(no_verack_idlenode.unexpected_msg == False)
 
 
 if __name__ == '__main__':
     P2PLeakTest().main()
diff --git a/test/functional/test_framework/mininode.py b/test/functional/test_framework/mininode.py
index 7db06f74b6..f4641074df 100755
--- a/test/functional/test_framework/mininode.py
+++ b/test/functional/test_framework/mininode.py
@@ -1,1781 +1,1683 @@
 #!/usr/bin/env python3
 # Copyright (c) 2010 ArtForz -- public domain half-a-node
 # Copyright (c) 2012 Jeff Garzik
 # Copyright (c) 2010-2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Bitcoin P2P network half-a-node.
 
 This python code was modified from ArtForz' public domain  half-a-node, as
 found in the mini-node branch of http://github.com/jgarzik/pynode.
 
 NodeConn: an object which manages p2p connectivity to a bitcoin node
 NodeConnCB: a base class that describes the interface for receiving
             callbacks with network messages from a NodeConn
 CBlock, CTransaction, CBlockHeader, CTxIn, CTxOut, etc....:
     data structures that should map to corresponding structures in
     bitcoin/primitives
 msg_block, msg_tx, msg_headers, etc.:
     data structures that represent network messages
 ser_*, deser_*: functions that handle serialization/deserialization
 """
 
 import asyncore
 from codecs import encode
 from collections import defaultdict
 import copy
 import hashlib
 from io import BytesIO
 import logging
 import random
 import socket
 import struct
 import sys
 import time
 from threading import RLock, Thread
 
 from test_framework.siphash import siphash256
 from test_framework.cdefs import MAX_BLOCK_SIGOPS_PER_MB
 from test_framework.util import hex_str_to_bytes, bytes_to_hex_str, wait_until
 
 BIP0031_VERSION = 60000
 MY_VERSION = 70014  # past bip-31 for ping/pong
 MY_SUBVERSION = b"/python-mininode-tester:0.0.3/"
 # from version 70001 onwards, fRelay should be appended to version messages (BIP37)
 MY_RELAY = 1
 
 MAX_INV_SZ = 50000
 
 COIN = 100000000  # 1 btc in satoshis
 
 NODE_NETWORK = (1 << 0)
 NODE_GETUTXO = (1 << 1)
 NODE_BLOOM = (1 << 2)
 NODE_WITNESS = (1 << 3)
 NODE_XTHIN = (1 << 4)
 NODE_BITCOIN_CASH = (1 << 5)
 
 # Howmuch data will be read from the network at once
 READ_BUFFER_SIZE = 8192
 
 logger = logging.getLogger("TestFramework.mininode")
 
 # Keep our own socket map for asyncore, so that we can track disconnects
 # ourselves (to workaround an issue with closing an asyncore socket when
 # using select)
 mininode_socket_map = dict()
 
 # One lock for synchronizing all data access between the networking thread (see
 # NetworkThread below) and the thread running the test logic.  For simplicity,
 # NodeConn acquires this lock whenever delivering a message to a NodeConnCB,
 # and whenever adding anything to the send buffer (in send_message()).  This
 # lock should be acquired in the thread running the test logic to synchronize
 # access to any data shared with the NodeConnCB or NodeConn.
 mininode_lock = RLock()
 
 # Serialization/deserialization tools
 
 
 def sha256(s):
     return hashlib.new('sha256', s).digest()
 
 
 def ripemd160(s):
     return hashlib.new('ripemd160', s).digest()
 
 
 def hash256(s):
     return sha256(sha256(s))
 
 
 def ser_compact_size(l):
     r = b""
     if l < 253:
         r = struct.pack("B", l)
     elif l < 0x10000:
         r = struct.pack("<BH", 253, l)
     elif l < 0x100000000:
         r = struct.pack("<BI", 254, l)
     else:
         r = struct.pack("<BQ", 255, l)
     return r
 
 
 def deser_compact_size(f):
     nit = struct.unpack("<B", f.read(1))[0]
     if nit == 253:
         nit = struct.unpack("<H", f.read(2))[0]
     elif nit == 254:
         nit = struct.unpack("<I", f.read(4))[0]
     elif nit == 255:
         nit = struct.unpack("<Q", f.read(8))[0]
     return nit
 
 
 def deser_string(f):
     nit = deser_compact_size(f)
     return f.read(nit)
 
 
 def ser_string(s):
     return ser_compact_size(len(s)) + s
 
 
 def deser_uint256(f):
     r = 0
     for i in range(8):
         t = struct.unpack("<I", f.read(4))[0]
         r += t << (i * 32)
     return r
 
 
 def ser_uint256(u):
     rs = b""
     for i in range(8):
         rs += struct.pack("<I", u & 0xFFFFFFFF)
         u >>= 32
     return rs
 
 
 def uint256_from_str(s):
     r = 0
     t = struct.unpack("<IIIIIIII", s[:32])
     for i in range(8):
         r += t[i] << (i * 32)
     return r
 
 
 def uint256_from_compact(c):
     nbytes = (c >> 24) & 0xFF
     v = (c & 0xFFFFFF) << (8 * (nbytes - 3))
     return v
 
 
 def deser_vector(f, c):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = c()
         t.deserialize(f)
         r.append(t)
     return r
 
 
 # ser_function_name: Allow for an alternate serialization function on the
 # entries in the vector.
 def ser_vector(l, ser_function_name=None):
     r = ser_compact_size(len(l))
     for i in l:
         if ser_function_name:
             r += getattr(i, ser_function_name)()
         else:
             r += i.serialize()
     return r
 
 
 def deser_uint256_vector(f):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = deser_uint256(f)
         r.append(t)
     return r
 
 
 def ser_uint256_vector(l):
     r = ser_compact_size(len(l))
     for i in l:
         r += ser_uint256(i)
     return r
 
 
 def deser_string_vector(f):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = deser_string(f)
         r.append(t)
     return r
 
 
 def ser_string_vector(l):
     r = ser_compact_size(len(l))
     for sv in l:
         r += ser_string(sv)
     return r
 
 
 def deser_int_vector(f):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = struct.unpack("<i", f.read(4))[0]
         r.append(t)
     return r
 
 
 def ser_int_vector(l):
     r = ser_compact_size(len(l))
     for i in l:
         r += struct.pack("<i", i)
     return r
 
 # Deserialize from a hex string representation (eg from RPC)
 
 
 def FromHex(obj, hex_string):
     obj.deserialize(BytesIO(hex_str_to_bytes(hex_string)))
     return obj
 
 # Convert a binary-serializable object to hex (eg for submission via RPC)
 
 
 def ToHex(obj):
     return bytes_to_hex_str(obj.serialize())
 
 # Objects that map to bitcoind objects, which can be serialized/deserialized
 
 
 class CAddress():
     def __init__(self):
         self.nServices = 1
         self.pchReserved = b"\x00" * 10 + b"\xff" * 2
         self.ip = "0.0.0.0"
         self.port = 0
 
     def deserialize(self, f):
         self.nServices = struct.unpack("<Q", f.read(8))[0]
         self.pchReserved = f.read(12)
         self.ip = socket.inet_ntoa(f.read(4))
         self.port = struct.unpack(">H", f.read(2))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.nServices)
         r += self.pchReserved
         r += socket.inet_aton(self.ip)
         r += struct.pack(">H", self.port)
         return r
 
     def __repr__(self):
         return "CAddress(nServices=%i ip=%s port=%i)" % (self.nServices,
                                                          self.ip, self.port)
 
 
 class CInv():
     typemap = {
         0: "Error",
         1: "TX",
         2: "Block",
         4: "CompactBlock"
     }
 
     def __init__(self, t=0, h=0):
         self.type = t
         self.hash = h
 
     def deserialize(self, f):
         self.type = struct.unpack("<i", f.read(4))[0]
         self.hash = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.type)
         r += ser_uint256(self.hash)
         return r
 
     def __repr__(self):
         return "CInv(type=%s hash=%064x)" \
             % (self.typemap[self.type], self.hash)
 
 
 class CBlockLocator():
     def __init__(self):
         self.nVersion = MY_VERSION
         self.vHave = []
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         self.vHave = deser_uint256_vector(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += ser_uint256_vector(self.vHave)
         return r
 
     def __repr__(self):
         return "CBlockLocator(nVersion=%i vHave=%s)" \
             % (self.nVersion, repr(self.vHave))
 
 
 class COutPoint():
     def __init__(self, hash=0, n=0):
         self.hash = hash
         self.n = n
 
     def deserialize(self, f):
         self.hash = deser_uint256(f)
         self.n = struct.unpack("<I", f.read(4))[0]
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.hash)
         r += struct.pack("<I", self.n)
         return r
 
     def __repr__(self):
         return "COutPoint(hash=%064x n=%i)" % (self.hash, self.n)
 
 
 class CTxIn():
     def __init__(self, outpoint=None, scriptSig=b"", nSequence=0):
         if outpoint is None:
             self.prevout = COutPoint()
         else:
             self.prevout = outpoint
         self.scriptSig = scriptSig
         self.nSequence = nSequence
 
     def deserialize(self, f):
         self.prevout = COutPoint()
         self.prevout.deserialize(f)
         self.scriptSig = deser_string(f)
         self.nSequence = struct.unpack("<I", f.read(4))[0]
 
     def serialize(self):
         r = b""
         r += self.prevout.serialize()
         r += ser_string(self.scriptSig)
         r += struct.pack("<I", self.nSequence)
         return r
 
     def __repr__(self):
         return "CTxIn(prevout=%s scriptSig=%s nSequence=%i)" \
             % (repr(self.prevout), bytes_to_hex_str(self.scriptSig),
                self.nSequence)
 
 
 class CTxOut():
     def __init__(self, nValue=0, scriptPubKey=b""):
         self.nValue = nValue
         self.scriptPubKey = scriptPubKey
 
     def deserialize(self, f):
         self.nValue = struct.unpack("<q", f.read(8))[0]
         self.scriptPubKey = deser_string(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<q", self.nValue)
         r += ser_string(self.scriptPubKey)
         return r
 
     def __repr__(self):
         return "CTxOut(nValue=%i.%08i scriptPubKey=%s)" \
             % (self.nValue // COIN, self.nValue % COIN,
                bytes_to_hex_str(self.scriptPubKey))
 
 
 class CTransaction():
     def __init__(self, tx=None):
         if tx is None:
             self.nVersion = 1
             self.vin = []
             self.vout = []
             self.nLockTime = 0
             self.sha256 = None
             self.hash = None
         else:
             self.nVersion = tx.nVersion
             self.vin = copy.deepcopy(tx.vin)
             self.vout = copy.deepcopy(tx.vout)
             self.nLockTime = tx.nLockTime
             self.sha256 = tx.sha256
             self.hash = tx.hash
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         self.vin = deser_vector(f, CTxIn)
         self.vout = deser_vector(f, CTxOut)
         self.nLockTime = struct.unpack("<I", f.read(4))[0]
         self.sha256 = None
         self.hash = None
 
     def billable_size(self):
         """
         Returns the size used for billing the against the transaction
         """
         return len(self.serialize())
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += ser_vector(self.vin)
         r += ser_vector(self.vout)
         r += struct.pack("<I", self.nLockTime)
         return r
 
     # Recalculate the txid
     def rehash(self):
         self.sha256 = None
         self.calc_sha256()
 
     # self.sha256 and self.hash -- those are expected to be the txid.
     def calc_sha256(self):
         if self.sha256 is None:
             self.sha256 = uint256_from_str(hash256(self.serialize()))
         self.hash = encode(
             hash256(self.serialize())[::-1], 'hex_codec').decode('ascii')
 
     def get_id(self):
         # For now, just forward the hash.
         self.calc_sha256()
         return self.hash
 
     def is_valid(self):
         self.calc_sha256()
         for tout in self.vout:
             if tout.nValue < 0 or tout.nValue > 21000000 * COIN:
                 return False
         return True
 
     def __repr__(self):
         return "CTransaction(nVersion=%i vin=%s vout=%s nLockTime=%i)" \
             % (self.nVersion, repr(self.vin), repr(self.vout), self.nLockTime)
 
 
 class CBlockHeader():
     def __init__(self, header=None):
         if header is None:
             self.set_null()
         else:
             self.nVersion = header.nVersion
             self.hashPrevBlock = header.hashPrevBlock
             self.hashMerkleRoot = header.hashMerkleRoot
             self.nTime = header.nTime
             self.nBits = header.nBits
             self.nNonce = header.nNonce
             self.sha256 = header.sha256
             self.hash = header.hash
             self.calc_sha256()
 
     def set_null(self):
         self.nVersion = 1
         self.hashPrevBlock = 0
         self.hashMerkleRoot = 0
         self.nTime = 0
         self.nBits = 0
         self.nNonce = 0
         self.sha256 = None
         self.hash = None
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         self.hashPrevBlock = deser_uint256(f)
         self.hashMerkleRoot = deser_uint256(f)
         self.nTime = struct.unpack("<I", f.read(4))[0]
         self.nBits = struct.unpack("<I", f.read(4))[0]
         self.nNonce = struct.unpack("<I", f.read(4))[0]
         self.sha256 = None
         self.hash = None
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += ser_uint256(self.hashPrevBlock)
         r += ser_uint256(self.hashMerkleRoot)
         r += struct.pack("<I", self.nTime)
         r += struct.pack("<I", self.nBits)
         r += struct.pack("<I", self.nNonce)
         return r
 
     def calc_sha256(self):
         if self.sha256 is None:
             r = b""
             r += struct.pack("<i", self.nVersion)
             r += ser_uint256(self.hashPrevBlock)
             r += ser_uint256(self.hashMerkleRoot)
             r += struct.pack("<I", self.nTime)
             r += struct.pack("<I", self.nBits)
             r += struct.pack("<I", self.nNonce)
             self.sha256 = uint256_from_str(hash256(r))
             self.hash = encode(hash256(r)[::-1], 'hex_codec').decode('ascii')
 
     def rehash(self):
         self.sha256 = None
         self.calc_sha256()
         return self.sha256
 
     def __repr__(self):
         return "CBlockHeader(nVersion=%i hashPrevBlock=%064x hashMerkleRoot=%064x nTime=%s nBits=%08x nNonce=%08x)" \
             % (self.nVersion, self.hashPrevBlock, self.hashMerkleRoot,
                time.ctime(self.nTime), self.nBits, self.nNonce)
 
 
 class CBlock(CBlockHeader):
 
     def __init__(self, header=None):
         super(CBlock, self).__init__(header)
         self.vtx = []
 
     def deserialize(self, f):
         super(CBlock, self).deserialize(f)
         self.vtx = deser_vector(f, CTransaction)
 
     def serialize(self):
         r = b""
         r += super(CBlock, self).serialize()
         r += ser_vector(self.vtx)
         return r
 
     # Calculate the merkle root given a vector of transaction hashes
     def get_merkle_root(self, hashes):
         while len(hashes) > 1:
             newhashes = []
             for i in range(0, len(hashes), 2):
                 i2 = min(i + 1, len(hashes) - 1)
                 newhashes.append(hash256(hashes[i] + hashes[i2]))
             hashes = newhashes
         return uint256_from_str(hashes[0])
 
     def calc_merkle_root(self):
         hashes = []
         for tx in self.vtx:
             tx.calc_sha256()
             hashes.append(ser_uint256(tx.sha256))
         return self.get_merkle_root(hashes)
 
     def is_valid(self):
         self.calc_sha256()
         target = uint256_from_compact(self.nBits)
         if self.sha256 > target:
             return False
         for tx in self.vtx:
             if not tx.is_valid():
                 return False
         if self.calc_merkle_root() != self.hashMerkleRoot:
             return False
         return True
 
     def solve(self):
         self.rehash()
         target = uint256_from_compact(self.nBits)
         while self.sha256 > target:
             self.nNonce += 1
             self.rehash()
 
     def __repr__(self):
         return "CBlock(nVersion=%i hashPrevBlock=%064x hashMerkleRoot=%064x nTime=%s nBits=%08x nNonce=%08x vtx=%s)" \
             % (self.nVersion, self.hashPrevBlock, self.hashMerkleRoot,
                time.ctime(self.nTime), self.nBits, self.nNonce, repr(self.vtx))
 
 
-class CUnsignedAlert():
-    def __init__(self):
-        self.nVersion = 1
-        self.nRelayUntil = 0
-        self.nExpiration = 0
-        self.nID = 0
-        self.nCancel = 0
-        self.setCancel = []
-        self.nMinVer = 0
-        self.nMaxVer = 0
-        self.setSubVer = []
-        self.nPriority = 0
-        self.strComment = b""
-        self.strStatusBar = b""
-        self.strReserved = b""
-
-    def deserialize(self, f):
-        self.nVersion = struct.unpack("<i", f.read(4))[0]
-        self.nRelayUntil = struct.unpack("<q", f.read(8))[0]
-        self.nExpiration = struct.unpack("<q", f.read(8))[0]
-        self.nID = struct.unpack("<i", f.read(4))[0]
-        self.nCancel = struct.unpack("<i", f.read(4))[0]
-        self.setCancel = deser_int_vector(f)
-        self.nMinVer = struct.unpack("<i", f.read(4))[0]
-        self.nMaxVer = struct.unpack("<i", f.read(4))[0]
-        self.setSubVer = deser_string_vector(f)
-        self.nPriority = struct.unpack("<i", f.read(4))[0]
-        self.strComment = deser_string(f)
-        self.strStatusBar = deser_string(f)
-        self.strReserved = deser_string(f)
-
-    def serialize(self):
-        r = b""
-        r += struct.pack("<i", self.nVersion)
-        r += struct.pack("<q", self.nRelayUntil)
-        r += struct.pack("<q", self.nExpiration)
-        r += struct.pack("<i", self.nID)
-        r += struct.pack("<i", self.nCancel)
-        r += ser_int_vector(self.setCancel)
-        r += struct.pack("<i", self.nMinVer)
-        r += struct.pack("<i", self.nMaxVer)
-        r += ser_string_vector(self.setSubVer)
-        r += struct.pack("<i", self.nPriority)
-        r += ser_string(self.strComment)
-        r += ser_string(self.strStatusBar)
-        r += ser_string(self.strReserved)
-        return r
-
-    def __repr__(self):
-        return "CUnsignedAlert(nVersion %d, nRelayUntil %d, nExpiration %d, nID %d, nCancel %d, nMinVer %d, nMaxVer %d, nPriority %d, strComment %s, strStatusBar %s, strReserved %s)" \
-            % (self.nVersion, self.nRelayUntil, self.nExpiration, self.nID,
-               self.nCancel, self.nMinVer, self.nMaxVer, self.nPriority,
-               self.strComment, self.strStatusBar, self.strReserved)
-
-
-class CAlert():
-    def __init__(self):
-        self.vchMsg = b""
-        self.vchSig = b""
-
-    def deserialize(self, f):
-        self.vchMsg = deser_string(f)
-        self.vchSig = deser_string(f)
-
-    def serialize(self):
-        r = b""
-        r += ser_string(self.vchMsg)
-        r += ser_string(self.vchSig)
-        return r
-
-    def __repr__(self):
-        return "CAlert(vchMsg.sz %d, vchSig.sz %d)" \
-            % (len(self.vchMsg), len(self.vchSig))
-
-
 class PrefilledTransaction():
     def __init__(self, index=0, tx=None):
         self.index = index
         self.tx = tx
 
     def deserialize(self, f):
         self.index = deser_compact_size(f)
         self.tx = CTransaction()
         self.tx.deserialize(f)
 
     def serialize(self):
         r = b""
         r += ser_compact_size(self.index)
         r += self.tx.serialize()
         return r
 
     def __repr__(self):
         return "PrefilledTransaction(index=%d, tx=%s)" % (self.index, repr(self.tx))
 
 # This is what we send on the wire, in a cmpctblock message.
 
 
 class P2PHeaderAndShortIDs():
     def __init__(self):
         self.header = CBlockHeader()
         self.nonce = 0
         self.shortids_length = 0
         self.shortids = []
         self.prefilled_txn_length = 0
         self.prefilled_txn = []
 
     def deserialize(self, f):
         self.header.deserialize(f)
         self.nonce = struct.unpack("<Q", f.read(8))[0]
         self.shortids_length = deser_compact_size(f)
         for i in range(self.shortids_length):
             # shortids are defined to be 6 bytes in the spec, so append
             # two zero bytes and read it in as an 8-byte number
             self.shortids.append(
                 struct.unpack("<Q", f.read(6) + b'\x00\x00')[0])
         self.prefilled_txn = deser_vector(f, PrefilledTransaction)
         self.prefilled_txn_length = len(self.prefilled_txn)
 
     def serialize(self):
         r = b""
         r += self.header.serialize()
         r += struct.pack("<Q", self.nonce)
         r += ser_compact_size(self.shortids_length)
         for x in self.shortids:
             # We only want the first 6 bytes
             r += struct.pack("<Q", x)[0:6]
         r += ser_vector(self.prefilled_txn)
         return r
 
     def __repr__(self):
         return "P2PHeaderAndShortIDs(header=%s, nonce=%d, shortids_length=%d, shortids=%s, prefilled_txn_length=%d, prefilledtxn=%s" % (repr(self.header), self.nonce, self.shortids_length, repr(self.shortids), self.prefilled_txn_length, repr(self.prefilled_txn))
 
 # Calculate the BIP 152-compact blocks shortid for a given transaction hash
 
 
 def calculate_shortid(k0, k1, tx_hash):
     expected_shortid = siphash256(k0, k1, tx_hash)
     expected_shortid &= 0x0000ffffffffffff
     return expected_shortid
 
 # This version gets rid of the array lengths, and reinterprets the differential
 # encoding into indices that can be used for lookup.
 
 
 class HeaderAndShortIDs():
     def __init__(self, p2pheaders_and_shortids=None):
         self.header = CBlockHeader()
         self.nonce = 0
         self.shortids = []
         self.prefilled_txn = []
 
         if p2pheaders_and_shortids != None:
             self.header = p2pheaders_and_shortids.header
             self.nonce = p2pheaders_and_shortids.nonce
             self.shortids = p2pheaders_and_shortids.shortids
             last_index = -1
             for x in p2pheaders_and_shortids.prefilled_txn:
                 self.prefilled_txn.append(
                     PrefilledTransaction(x.index + last_index + 1, x.tx))
                 last_index = self.prefilled_txn[-1].index
 
     def to_p2p(self):
         ret = P2PHeaderAndShortIDs()
         ret.header = self.header
         ret.nonce = self.nonce
         ret.shortids_length = len(self.shortids)
         ret.shortids = self.shortids
         ret.prefilled_txn_length = len(self.prefilled_txn)
         ret.prefilled_txn = []
         last_index = -1
         for x in self.prefilled_txn:
             ret.prefilled_txn.append(
                 PrefilledTransaction(x.index - last_index - 1, x.tx))
             last_index = x.index
         return ret
 
     def get_siphash_keys(self):
         header_nonce = self.header.serialize()
         header_nonce += struct.pack("<Q", self.nonce)
         hash_header_nonce_as_str = sha256(header_nonce)
         key0 = struct.unpack("<Q", hash_header_nonce_as_str[0:8])[0]
         key1 = struct.unpack("<Q", hash_header_nonce_as_str[8:16])[0]
         return [key0, key1]
 
     # Version 2 compact blocks use wtxid in shortids (rather than txid)
     def initialize_from_block(self, block, nonce=0, prefill_list=[0]):
         self.header = CBlockHeader(block)
         self.nonce = nonce
         self.prefilled_txn = [PrefilledTransaction(i, block.vtx[i])
                               for i in prefill_list]
         self.shortids = []
         [k0, k1] = self.get_siphash_keys()
         for i in range(len(block.vtx)):
             if i not in prefill_list:
                 tx_hash = block.vtx[i].sha256
                 self.shortids.append(calculate_shortid(k0, k1, tx_hash))
 
     def __repr__(self):
         return "HeaderAndShortIDs(header=%s, nonce=%d, shortids=%s, prefilledtxn=%s" % (repr(self.header), self.nonce, repr(self.shortids), repr(self.prefilled_txn))
 
 
 class BlockTransactionsRequest():
 
     def __init__(self, blockhash=0, indexes=None):
         self.blockhash = blockhash
         self.indexes = indexes if indexes != None else []
 
     def deserialize(self, f):
         self.blockhash = deser_uint256(f)
         indexes_length = deser_compact_size(f)
         for i in range(indexes_length):
             self.indexes.append(deser_compact_size(f))
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.blockhash)
         r += ser_compact_size(len(self.indexes))
         for x in self.indexes:
             r += ser_compact_size(x)
         return r
 
     # helper to set the differentially encoded indexes from absolute ones
     def from_absolute(self, absolute_indexes):
         self.indexes = []
         last_index = -1
         for x in absolute_indexes:
             self.indexes.append(x - last_index - 1)
             last_index = x
 
     def to_absolute(self):
         absolute_indexes = []
         last_index = -1
         for x in self.indexes:
             absolute_indexes.append(x + last_index + 1)
             last_index = absolute_indexes[-1]
         return absolute_indexes
 
     def __repr__(self):
         return "BlockTransactionsRequest(hash=%064x indexes=%s)" % (self.blockhash, repr(self.indexes))
 
 
 class BlockTransactions():
 
     def __init__(self, blockhash=0, transactions=None):
         self.blockhash = blockhash
         self.transactions = transactions if transactions != None else []
 
     def deserialize(self, f):
         self.blockhash = deser_uint256(f)
         self.transactions = deser_vector(f, CTransaction)
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.blockhash)
         r += ser_vector(self.transactions)
         return r
 
     def __repr__(self):
         return "BlockTransactions(hash=%064x transactions=%s)" % (self.blockhash, repr(self.transactions))
 
 
 # Objects that correspond to messages on the wire
 class msg_version():
     command = b"version"
 
     def __init__(self):
         self.nVersion = MY_VERSION
         self.nServices = 1
         self.nTime = int(time.time())
         self.addrTo = CAddress()
         self.addrFrom = CAddress()
         self.nNonce = random.getrandbits(64)
         self.strSubVer = MY_SUBVERSION
         self.nStartingHeight = -1
         self.nRelay = MY_RELAY
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         if self.nVersion == 10300:
             self.nVersion = 300
         self.nServices = struct.unpack("<Q", f.read(8))[0]
         self.nTime = struct.unpack("<q", f.read(8))[0]
         self.addrTo = CAddress()
         self.addrTo.deserialize(f)
 
         if self.nVersion >= 106:
             self.addrFrom = CAddress()
             self.addrFrom.deserialize(f)
             self.nNonce = struct.unpack("<Q", f.read(8))[0]
             self.strSubVer = deser_string(f)
         else:
             self.addrFrom = None
             self.nNonce = None
             self.strSubVer = None
             self.nStartingHeight = None
 
         if self.nVersion >= 209:
             self.nStartingHeight = struct.unpack("<i", f.read(4))[0]
         else:
             self.nStartingHeight = None
 
         if self.nVersion >= 70001:
             # Relay field is optional for version 70001 onwards
             try:
                 self.nRelay = struct.unpack("<b", f.read(1))[0]
             except:
                 self.nRelay = 0
         else:
             self.nRelay = 0
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += struct.pack("<Q", self.nServices)
         r += struct.pack("<q", self.nTime)
         r += self.addrTo.serialize()
         r += self.addrFrom.serialize()
         r += struct.pack("<Q", self.nNonce)
         r += ser_string(self.strSubVer)
         r += struct.pack("<i", self.nStartingHeight)
         r += struct.pack("<b", self.nRelay)
         return r
 
     def __repr__(self):
         return 'msg_version(nVersion=%i nServices=%i nTime=%s addrTo=%s addrFrom=%s nNonce=0x%016X strSubVer=%s nStartingHeight=%i nRelay=%i)' \
             % (self.nVersion, self.nServices, time.ctime(self.nTime),
                repr(self.addrTo), repr(self.addrFrom), self.nNonce,
                self.strSubVer, self.nStartingHeight, self.nRelay)
 
 
 class msg_verack():
     command = b"verack"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_verack()"
 
 
 class msg_addr():
     command = b"addr"
 
     def __init__(self):
         self.addrs = []
 
     def deserialize(self, f):
         self.addrs = deser_vector(f, CAddress)
 
     def serialize(self):
         return ser_vector(self.addrs)
 
     def __repr__(self):
         return "msg_addr(addrs=%s)" % (repr(self.addrs))
 
-
-class msg_alert():
-    command = b"alert"
-
-    def __init__(self):
-        self.alert = CAlert()
-
-    def deserialize(self, f):
-        self.alert = CAlert()
-        self.alert.deserialize(f)
-
-    def serialize(self):
-        r = b""
-        r += self.alert.serialize()
-        return r
-
-    def __repr__(self):
-        return "msg_alert(alert=%s)" % (repr(self.alert), )
-
-
 class msg_inv():
     command = b"inv"
 
     def __init__(self, inv=None):
         if inv is None:
             self.inv = []
         else:
             self.inv = inv
 
     def deserialize(self, f):
         self.inv = deser_vector(f, CInv)
 
     def serialize(self):
         return ser_vector(self.inv)
 
     def __repr__(self):
         return "msg_inv(inv=%s)" % (repr(self.inv))
 
 
 class msg_getdata():
     command = b"getdata"
 
     def __init__(self, inv=None):
         self.inv = inv if inv != None else []
 
     def deserialize(self, f):
         self.inv = deser_vector(f, CInv)
 
     def serialize(self):
         return ser_vector(self.inv)
 
     def __repr__(self):
         return "msg_getdata(inv=%s)" % (repr(self.inv))
 
 
 class msg_getblocks():
     command = b"getblocks"
 
     def __init__(self):
         self.locator = CBlockLocator()
         self.hashstop = 0
 
     def deserialize(self, f):
         self.locator = CBlockLocator()
         self.locator.deserialize(f)
         self.hashstop = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += self.locator.serialize()
         r += ser_uint256(self.hashstop)
         return r
 
     def __repr__(self):
         return "msg_getblocks(locator=%s hashstop=%064x)" \
             % (repr(self.locator), self.hashstop)
 
 
 class msg_tx():
     command = b"tx"
 
     def __init__(self, tx=CTransaction()):
         self.tx = tx
 
     def deserialize(self, f):
         self.tx.deserialize(f)
 
     def serialize(self):
         return self.tx.serialize()
 
     def __repr__(self):
         return "msg_tx(tx=%s)" % (repr(self.tx))
 
 
 class msg_block():
     command = b"block"
 
     def __init__(self, block=None):
         if block is None:
             self.block = CBlock()
         else:
             self.block = block
 
     def deserialize(self, f):
         self.block.deserialize(f)
 
     def serialize(self):
         return self.block.serialize()
 
     def __repr__(self):
         return "msg_block(block=%s)" % (repr(self.block))
 
 # for cases where a user needs tighter control over what is sent over the wire
 # note that the user must supply the name of the command, and the data
 
 
 class msg_generic():
     def __init__(self, command, data=None):
         self.command = command
         self.data = data
 
     def serialize(self):
         return self.data
 
     def __repr__(self):
         return "msg_generic()"
 
 
 class msg_getaddr():
     command = b"getaddr"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_getaddr()"
 
 
 class msg_ping_prebip31():
     command = b"ping"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_ping() (pre-bip31)"
 
 
 class msg_ping():
     command = b"ping"
 
     def __init__(self, nonce=0):
         self.nonce = nonce
 
     def deserialize(self, f):
         self.nonce = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.nonce)
         return r
 
     def __repr__(self):
         return "msg_ping(nonce=%08x)" % self.nonce
 
 
 class msg_pong():
     command = b"pong"
 
     def __init__(self, nonce=0):
         self.nonce = nonce
 
     def deserialize(self, f):
         self.nonce = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.nonce)
         return r
 
     def __repr__(self):
         return "msg_pong(nonce=%08x)" % self.nonce
 
 
 class msg_mempool():
     command = b"mempool"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_mempool()"
 
 
 class msg_sendheaders():
     command = b"sendheaders"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_sendheaders()"
 
 
 # getheaders message has
 # number of entries
 # vector of hashes
 # hash_stop (hash of last desired block header, 0 to get as many as possible)
 class msg_getheaders():
     command = b"getheaders"
 
     def __init__(self):
         self.locator = CBlockLocator()
         self.hashstop = 0
 
     def deserialize(self, f):
         self.locator = CBlockLocator()
         self.locator.deserialize(f)
         self.hashstop = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += self.locator.serialize()
         r += ser_uint256(self.hashstop)
         return r
 
     def __repr__(self):
         return "msg_getheaders(locator=%s, stop=%064x)" \
             % (repr(self.locator), self.hashstop)
 
 
 # headers message has
 # <count> <vector of block headers>
 class msg_headers():
     command = b"headers"
 
     def __init__(self):
         self.headers = []
 
     def deserialize(self, f):
         # comment in bitcoind indicates these should be deserialized as blocks
         blocks = deser_vector(f, CBlock)
         for x in blocks:
             self.headers.append(CBlockHeader(x))
 
     def serialize(self):
         blocks = [CBlock(x) for x in self.headers]
         return ser_vector(blocks)
 
     def __repr__(self):
         return "msg_headers(headers=%s)" % repr(self.headers)
 
 
 class msg_reject():
     command = b"reject"
     REJECT_MALFORMED = 1
 
     def __init__(self):
         self.message = b""
         self.code = 0
         self.reason = b""
         self.data = 0
 
     def deserialize(self, f):
         self.message = deser_string(f)
         self.code = struct.unpack("<B", f.read(1))[0]
         self.reason = deser_string(f)
         if (self.code != self.REJECT_MALFORMED and
                 (self.message == b"block" or self.message == b"tx")):
             self.data = deser_uint256(f)
 
     def serialize(self):
         r = ser_string(self.message)
         r += struct.pack("<B", self.code)
         r += ser_string(self.reason)
         if (self.code != self.REJECT_MALFORMED and
                 (self.message == b"block" or self.message == b"tx")):
             r += ser_uint256(self.data)
         return r
 
     def __repr__(self):
         return "msg_reject: %s %d %s [%064x]" \
             % (self.message, self.code, self.reason, self.data)
 
 
 class msg_feefilter():
     command = b"feefilter"
 
     def __init__(self, feerate=0):
         self.feerate = feerate
 
     def deserialize(self, f):
         self.feerate = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.feerate)
         return r
 
     def __repr__(self):
         return "msg_feefilter(feerate=%08x)" % self.feerate
 
 
 class msg_sendcmpct():
     command = b"sendcmpct"
 
     def __init__(self):
         self.announce = False
         self.version = 1
 
     def deserialize(self, f):
         self.announce = struct.unpack("<?", f.read(1))[0]
         self.version = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<?", self.announce)
         r += struct.pack("<Q", self.version)
         return r
 
     def __repr__(self):
         return "msg_sendcmpct(announce=%s, version=%lu)" % (self.announce, self.version)
 
 
 class msg_cmpctblock():
     command = b"cmpctblock"
 
     def __init__(self, header_and_shortids=None):
         self.header_and_shortids = header_and_shortids
 
     def deserialize(self, f):
         self.header_and_shortids = P2PHeaderAndShortIDs()
         self.header_and_shortids.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.header_and_shortids.serialize()
         return r
 
     def __repr__(self):
         return "msg_cmpctblock(HeaderAndShortIDs=%s)" % repr(self.header_and_shortids)
 
 
 class msg_getblocktxn():
     command = b"getblocktxn"
 
     def __init__(self):
         self.block_txn_request = None
 
     def deserialize(self, f):
         self.block_txn_request = BlockTransactionsRequest()
         self.block_txn_request.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.block_txn_request.serialize()
         return r
 
     def __repr__(self):
         return "msg_getblocktxn(block_txn_request=%s)" % (repr(self.block_txn_request))
 
 
 class msg_blocktxn():
     command = b"blocktxn"
 
     def __init__(self):
         self.block_transactions = BlockTransactions()
 
     def deserialize(self, f):
         self.block_transactions.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.block_transactions.serialize()
         return r
 
     def __repr__(self):
         return "msg_blocktxn(block_transactions=%s)" % (repr(self.block_transactions))
 
 
 class NodeConnCB():
     """Callback and helper functions for P2P connection to a bitcoind node.
 
     Individual testcases should subclass this and override the on_* methods
     if they want to alter message handling behaviour.
     """
 
     def __init__(self):
         # Track whether we have a P2P connection open to the node
         self.connected = False
         self.connection = None
 
         # Track number of messages of each type received and the most recent
         # message of each type
         self.message_count = defaultdict(int)
         self.last_message = {}
 
         # A count of the number of ping messages we've sent to the node
         self.ping_counter = 1
 
         # deliver_sleep_time is helpful for debugging race conditions in p2p
         # tests; it causes message delivery to sleep for the specified time
         # before acquiring the global lock and delivering the next message.
         self.deliver_sleep_time = None
 
         # Remember the services our peer has advertised
         self.peer_services = None
 
     # Message receiving methods
 
     def deliver(self, conn, message):
         """Receive message and dispatch message to appropriate callback.
 
         We keep a count of how many of each message type has been received
         and the most recent message of each type.
 
         Optionally waits for deliver_sleep_time before dispatching message.
         """
 
         deliver_sleep = self.get_deliver_sleep_time()
         if deliver_sleep is not None:
             time.sleep(deliver_sleep)
         with mininode_lock:
             try:
                 command = message.command.decode('ascii')
                 self.message_count[command] += 1
                 self.last_message[command] = message
                 getattr(self, 'on_' + command)(conn, message)
             except:
                 print("ERROR delivering %s (%s)" % (repr(message),
                                                     sys.exc_info()[0]))
                 raise
 
     def set_deliver_sleep_time(self, value):
         with mininode_lock:
             self.deliver_sleep_time = value
 
     def get_deliver_sleep_time(self):
         with mininode_lock:
             return self.deliver_sleep_time
 
     # Callback methods. Can be overridden by subclasses in individual test
     # cases to provide custom message handling behaviour.
 
     def on_open(self, conn):
         self.connected = True
 
     def on_close(self, conn):
         self.connected = False
         self.connection = None
 
     def on_addr(self, conn, message): pass
 
-    def on_alert(self, conn, message): pass
-
     def on_block(self, conn, message): pass
 
     def on_blocktxn(self, conn, message): pass
 
     def on_cmpctblock(self, conn, message): pass
 
     def on_feefilter(self, conn, message): pass
 
     def on_getaddr(self, conn, message): pass
 
     def on_getblocks(self, conn, message): pass
 
     def on_getblocktxn(self, conn, message): pass
 
     def on_getdata(self, conn, message): pass
 
     def on_getheaders(self, conn, message): pass
 
     def on_headers(self, conn, message): pass
 
     def on_mempool(self, conn): pass
 
     def on_pong(self, conn, message): pass
 
     def on_reject(self, conn, message): pass
 
     def on_sendcmpct(self, conn, message): pass
 
     def on_sendheaders(self, conn, message): pass
 
     def on_tx(self, conn, message): pass
 
     def on_inv(self, conn, message):
         want = msg_getdata()
         for i in message.inv:
             if i.type != 0:
                 want.inv.append(i)
         if len(want.inv):
             conn.send_message(want)
 
     def on_ping(self, conn, message):
         if conn.ver_send > BIP0031_VERSION:
             conn.send_message(msg_pong(message.nonce))
 
     def on_verack(self, conn, message):
         conn.ver_recv = conn.ver_send
         self.verack_received = True
 
     def on_version(self, conn, message):
         if message.nVersion >= 209:
             conn.send_message(msg_verack())
         conn.ver_send = min(MY_VERSION, message.nVersion)
         if message.nVersion < 209:
             conn.ver_recv = conn.ver_send
         conn.nServices = message.nServices
 
     # Connection helper methods
 
     def add_connection(self, conn):
         self.connection = conn
 
     def wait_for_disconnect(self, timeout=60):
         def test_function(): return not self.connected
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     # Message receiving helper methods
 
     def wait_for_block(self, blockhash, timeout=60):
         def test_function(): return self.last_message.get(
             "block") and self.last_message["block"].block.rehash() == blockhash
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_getdata(self, timeout=60):
         def test_function(): return self.last_message.get("getdata")
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_getheaders(self, timeout=60):
         def test_function(): return self.last_message.get("getheaders")
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_inv(self, expected_inv, timeout=60):
         """Waits for an INV message and checks that the first inv object in the message was as expected."""
         if len(expected_inv) > 1:
             raise NotImplementedError(
                 "wait_for_inv() will only verify the first inv object")
 
         def test_function(): return self.last_message.get("inv") and \
             self.last_message["inv"].inv[0].type == expected_inv[0].type and \
             self.last_message["inv"].inv[0].hash == expected_inv[0].hash
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     def wait_for_verack(self, timeout=60):
         def test_function(): return self.message_count["verack"]
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
     # Message sending helper functions
 
     def send_message(self, message):
         if self.connection:
             self.connection.send_message(message)
         else:
             logger.error("Cannot send message. No connection to node!")
 
     def send_and_ping(self, message):
         self.send_message(message)
         self.sync_with_ping()
 
     # Sync up with the node
     def sync_with_ping(self, timeout=60):
         self.send_message(msg_ping(nonce=self.ping_counter))
 
         def test_function():
             if not self.last_message.get("pong"):
                 return False
             return self.last_message["pong"].nonce == self.ping_counter
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
         self.ping_counter += 1
 
 # The actual NodeConn class
 # This class provides an interface for a p2p connection to a specified node
 
 
 class NodeConn(asyncore.dispatcher):
     messagemap = {
         b"version": msg_version,
         b"verack": msg_verack,
         b"addr": msg_addr,
-        b"alert": msg_alert,
         b"inv": msg_inv,
         b"getdata": msg_getdata,
         b"getblocks": msg_getblocks,
         b"tx": msg_tx,
         b"block": msg_block,
         b"getaddr": msg_getaddr,
         b"ping": msg_ping,
         b"pong": msg_pong,
         b"headers": msg_headers,
         b"getheaders": msg_getheaders,
         b"reject": msg_reject,
         b"mempool": msg_mempool,
         b"feefilter": msg_feefilter,
         b"sendheaders": msg_sendheaders,
         b"sendcmpct": msg_sendcmpct,
         b"cmpctblock": msg_cmpctblock,
         b"getblocktxn": msg_getblocktxn,
         b"blocktxn": msg_blocktxn
     }
 
     MAGIC_BYTES = {
         "mainnet": b"\xe3\xe1\xf3\xe8",
         "testnet3": b"\xf4\xe5\xf3\xf4",
         "regtest": b"\xda\xb5\xbf\xfa",
     }
 
     def __init__(self, dstaddr, dstport, rpc, callback, net="regtest", services=NODE_NETWORK, send_version=True):
         asyncore.dispatcher.__init__(self, map=mininode_socket_map)
         self.dstaddr = dstaddr
         self.dstport = dstport
         self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
         self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
         self.sendbuf = b""
         self.recvbuf = b""
         self.ver_send = 209
         self.ver_recv = 209
         self.last_sent = 0
         self.state = "connecting"
         self.network = net
         self.cb = callback
         self.disconnect = False
         self.nServices = 0
 
         if send_version:
             # stuff version msg into sendbuf
             vt = msg_version()
             vt.nServices = services
             vt.addrTo.ip = self.dstaddr
             vt.addrTo.port = self.dstport
             vt.addrFrom.ip = "0.0.0.0"
             vt.addrFrom.port = 0
             self.send_message(vt, True)
 
         logger.info('Connecting to Bitcoin Node: %s:%d' %
                     (self.dstaddr, self.dstport))
 
         try:
             self.connect((dstaddr, dstport))
         except:
             self.handle_close()
         self.rpc = rpc
 
     def handle_connect(self):
         if self.state != "connected":
             logger.debug("Connected & Listening: %s:%d" %
                          (self.dstaddr, self.dstport))
             self.state = "connected"
             self.cb.on_open(self)
 
     def handle_close(self):
         logger.debug("Closing connection to: %s:%d" %
                      (self.dstaddr, self.dstport))
         self.state = "closed"
         self.recvbuf = b""
         self.sendbuf = b""
         try:
             self.close()
         except:
             pass
         self.cb.on_close(self)
 
     def handle_read(self):
         with mininode_lock:
             t = self.recv(READ_BUFFER_SIZE)
             if len(t) > 0:
                 self.recvbuf += t
 
         while True:
             msg = self.got_data()
             if msg == None:
                 break
             self.got_message(msg)
 
     def readable(self):
         return True
 
     def writable(self):
         with mininode_lock:
             pre_connection = self.state == "connecting"
             length = len(self.sendbuf)
         return (length > 0 or pre_connection)
 
     def handle_write(self):
         with mininode_lock:
             # asyncore does not expose socket connection, only the first read/write
             # event, thus we must check connection manually here to know when we
             # actually connect
             if self.state == "connecting":
                 self.handle_connect()
             if not self.writable():
                 return
 
             try:
                 sent = self.send(self.sendbuf)
             except:
                 self.handle_close()
                 return
             self.sendbuf = self.sendbuf[sent:]
 
     def got_data(self):
         try:
             with mininode_lock:
                 if len(self.recvbuf) < 4:
                     return None
                 if self.recvbuf[:4] != self.MAGIC_BYTES[self.network]:
                     raise ValueError("got garbage %s" % repr(self.recvbuf))
                 if self.ver_recv < 209:
                     if len(self.recvbuf) < 4 + 12 + 4:
                         return None
                     command = self.recvbuf[4:4 + 12].split(b"\x00", 1)[0]
                     msglen = struct.unpack(
                         "<i", self.recvbuf[4 + 12:4 + 12 + 4])[0]
                     checksum = None
                     if len(self.recvbuf) < 4 + 12 + 4 + msglen:
                         return None
                     msg = self.recvbuf[4 + 12 + 4:4 + 12 + 4 + msglen]
                     self.recvbuf = self.recvbuf[4 + 12 + 4 + msglen:]
                 else:
                     if len(self.recvbuf) < 4 + 12 + 4 + 4:
                         return None
                     command = self.recvbuf[4:4 + 12].split(b"\x00", 1)[0]
                     msglen = struct.unpack(
                         "<i", self.recvbuf[4 + 12:4 + 12 + 4])[0]
                     checksum = self.recvbuf[4 + 12 + 4:4 + 12 + 4 + 4]
                     if len(self.recvbuf) < 4 + 12 + 4 + 4 + msglen:
                         return None
                     msg = self.recvbuf[4 + 12 + 4 + 4:4 + 12 + 4 + 4 + msglen]
                     h = sha256(sha256(msg))
                     if checksum != h[:4]:
                         raise ValueError(
                             "got bad checksum " + repr(self.recvbuf))
                     self.recvbuf = self.recvbuf[4+12+4+4+msglen:]
                 if command not in self.messagemap:
                     logger.warning("Received unknown command from %s:%d: '%s' %s" % (
                         self.dstaddr, self.dstport, command, repr(msg)))
                     raise ValueError("Unknown command: '%s'" % (command))
                 f = BytesIO(msg)
                 m = self.messagemap[command]()
                 m.deserialize(f)
                 return m
 
         except Exception as e:
             logger.exception('got_data:', repr(e))
             raise
 
     def send_message(self, message, pushbuf=False):
         if self.state != "connected" and not pushbuf:
             raise IOError('Not connected, no pushbuf')
         self._log_message("send", message)
         command = message.command
         data = message.serialize()
         tmsg = self.MAGIC_BYTES[self.network]
         tmsg += command
         tmsg += b"\x00" * (12 - len(command))
         tmsg += struct.pack("<I", len(data))
         if self.ver_send >= 209:
             th = sha256(data)
             h = sha256(th)
             tmsg += h[:4]
         tmsg += data
         with mininode_lock:
             if (len(self.sendbuf) == 0 and not pushbuf):
                 try:
                     sent = self.send(tmsg)
                     self.sendbuf = tmsg[sent:]
                 except BlockingIOError:
                     self.sendbuf = tmsg
             else:
                 self.sendbuf += tmsg
             self.last_sent = time.time()
 
     def got_message(self, message):
         if message.command == b"version":
             if message.nVersion <= BIP0031_VERSION:
                 self.messagemap[b'ping'] = msg_ping_prebip31
         if self.last_sent + 30 * 60 < time.time():
             self.send_message(self.messagemap[b'ping']())
         self._log_message("receive", message)
         self.cb.deliver(self, message)
 
     def _log_message(self, direction, msg):
         if direction == "send":
             log_message = "Send message to "
         elif direction == "receive":
             log_message = "Received message from "
         log_message += "%s:%d: %s" % (self.dstaddr,
                                       self.dstport, repr(msg)[:500])
         if len(log_message) > 500:
             log_message += "... (msg truncated)"
         logger.debug(log_message)
 
     def disconnect_node(self):
         self.disconnect = True
 
 
 class NetworkThread(Thread):
 
     def run(self):
         while mininode_socket_map:
             # We check for whether to disconnect outside of the asyncore
             # loop to workaround the behavior of asyncore when using
             # select
             disconnected = []
             for fd, obj in mininode_socket_map.items():
                 if obj.disconnect:
                     disconnected.append(obj)
             [obj.handle_close() for obj in disconnected]
             asyncore.loop(0.1, use_poll=True, map=mininode_socket_map, count=1)
         logger.debug("Network thread closing")
 
 
 # An exception we can raise if we detect a potential disconnect
 # (p2p or rpc) before the test is complete
 class EarlyDisconnectError(Exception):
 
     def __init__(self, value):
         self.value = value
 
     def __str__(self):
         return repr(self.value)