[test] Move MY_RELAY to p2p.py

messages.py is for message and primitive data structures. Specifics
about the test framework's p2p implementation should be in p2p.py.

Also rename to P2P_VERSION_RELAY. Also rename msg_version.nRelay to
relay. In Bitcoin Core, this is referred to as fRelay, since it's a
bool, so this field has always been misnamed.

test/functional/p2p_filter.py

@@ -221,11 +221,11 @@ class FilterTest(BitcoinTestFramework):
         self.log.info('Test BIP 37 for a node with fRelay = False')
         # Add peer but do not send version yet
         filter_peer_without_nrelay = self.nodes[0].add_p2p_connection(P2PBloomFilter(), send_version=False, wait_for_verack=False)
-        # Send version with fRelay=False
+        # Send version with relay=False
         version_without_fRelay = msg_version()
         version_without_fRelay.nVersion = P2P_VERSION
         version_without_fRelay.strSubVer = P2P_SUBVERSION
-        version_without_fRelay.nRelay = 0
+        version_without_fRelay.relay = 0
         filter_peer_without_nrelay.send_message(version_without_fRelay)
         filter_peer_without_nrelay.wait_for_verack()
         assert not self.nodes[0].getpeerinfo()[0]['relaytxes']

test/functional/p2p_leak.py

@@ -20,6 +20,7 @@ from test_framework.messages import (
 from test_framework.p2p import (
     P2PInterface,
     P2P_SUBVERSION,
+    P2P_VERSION_RELAY,
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
@@ -128,13 +129,14 @@ class P2PLeakTest(BitcoinTestFramework):
         assert_equal(ver.addrFrom.port, 0)
         assert_equal(ver.addrFrom.ip, '0.0.0.0')
         assert_equal(ver.nStartingHeight, 201)
-        assert_equal(ver.nRelay, 1)
+        assert_equal(ver.relay, 1)
 
         self.log.info('Check that old peers are disconnected')
         p2p_old_peer = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False)
         old_version_msg = msg_version()
         old_version_msg.nVersion = 31799
         old_version_msg.strSubVer = P2P_SUBVERSION
+        old_version_msg.relay = P2P_VERSION_RELAY
         with self.nodes[0].assert_debug_log(['peer=3 using obsolete version 31799; disconnecting']):
             p2p_old_peer.send_message(old_version_msg)
             p2p_old_peer.wait_for_disconnect()

test/functional/test_framework/messages.py

@@ -31,8 +31,6 @@ import time
 from test_framework.siphash import siphash256
 from test_framework.util import hex_str_to_bytes, assert_equal
 
-MY_RELAY = 1 # from version 70001 onwards, fRelay should be appended to version messages (BIP37)
-
 MAX_LOCATOR_SZ = 101
 MAX_BLOCK_BASE_SIZE = 1000000
 MAX_BLOOM_FILTER_SIZE = 36000
@@ -1018,7 +1016,7 @@ class CMerkleBlock:
 
 # Objects that correspond to messages on the wire
 class msg_version:
-    __slots__ = ("addrFrom", "addrTo", "nNonce", "nRelay", "nServices",
+    __slots__ = ("addrFrom", "addrTo", "nNonce", "relay", "nServices",
                  "nStartingHeight", "nTime", "nVersion", "strSubVer")
     msgtype = b"version"
 
@@ -1031,7 +1029,7 @@ class msg_version:
         self.nNonce = random.getrandbits(64)
         self.strSubVer = ''
         self.nStartingHeight = -1
-        self.nRelay = MY_RELAY
+        self.relay = 0
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
@@ -1050,11 +1048,11 @@ class msg_version:
         if self.nVersion >= 70001:
             # Relay field is optional for version 70001 onwards
             try:
-                self.nRelay = struct.unpack("<b", f.read(1))[0]
+                self.relay = struct.unpack("<b", f.read(1))[0]
             except:
-                self.nRelay = 0
+                self.relay = 0
         else:
-            self.nRelay = 0
+            self.relay = 0
 
     def serialize(self):
         r = b""
@@ -1066,14 +1064,14 @@ class msg_version:
         r += struct.pack("<Q", self.nNonce)
         r += ser_string(self.strSubVer.encode('utf-8'))
         r += struct.pack("<i", self.nStartingHeight)
-        r += struct.pack("<b", self.nRelay)
+        r += struct.pack("<b", self.relay)
         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)' \
+        return 'msg_version(nVersion=%i nServices=%i nTime=%s addrTo=%s addrFrom=%s nNonce=0x%016X strSubVer=%s nStartingHeight=%i relay=%i)' \
             % (self.nVersion, self.nServices, time.ctime(self.nTime),
                repr(self.addrTo), repr(self.addrFrom), self.nNonce,
-               self.strSubVer, self.nStartingHeight, self.nRelay)
+               self.strSubVer, self.nStartingHeight, self.relay)
 
 
 class msg_verack:

test/functional/test_framework/p2p.py

@@ -85,6 +85,8 @@ MIN_P2P_VERSION_SUPPORTED = 60001
 P2P_VERSION = 70016
 # The P2P user agent string that this test framework sends in its `version` message
 P2P_SUBVERSION = "/python-p2p-tester:0.0.3/"
+# Value for relay that this test framework sends in its `version` message
+P2P_VERSION_RELAY = 1
 
 MESSAGEMAP = {
     b"addr": msg_addr,
@@ -336,6 +338,7 @@ class P2PInterface(P2PConnection):
         vt = msg_version()
         vt.nVersion = P2P_VERSION
         vt.strSubVer = P2P_SUBVERSION
+        vt.relay = P2P_VERSION_RELAY
         vt.nServices = services
         vt.addrTo.ip = self.dstaddr
         vt.addrTo.port = self.dstport