[test] Add P2P_SERVICES to p2p.py

The messages.py module should contain code and helpers for
[de]serializing p2p messages. Specific usage of those messages should
be in p2p.py. Therefore specify the nServices value in the calling code,
not in the messages.py module.

Author: jnewbery

test/functional/p2p_filter.py

@@ -21,6 +21,7 @@
 )
 from test_framework.p2p import (
     P2PInterface,
+    P2P_SERVICES,
     P2P_SUBVERSION,
     P2P_VERSION,
     p2p_lock,
@@ -225,6 +226,7 @@ def run_test(self):
         version_without_fRelay = msg_version()
         version_without_fRelay.nVersion = P2P_VERSION
         version_without_fRelay.strSubVer = P2P_SUBVERSION
+        version_without_fRelay.nServices = P2P_SERVICES
         version_without_fRelay.relay = 0
         filter_peer_without_nrelay.send_message(version_without_fRelay)
         filter_peer_without_nrelay.wait_for_verack()

test/functional/p2p_leak.py

@@ -20,6 +20,7 @@
 from test_framework.p2p import (
     P2PInterface,
     P2P_SUBVERSION,
+    P2P_SERVICES,
     P2P_VERSION_RELAY,
 )
 from test_framework.test_framework import BitcoinTestFramework
@@ -136,6 +137,7 @@ def run_test(self):
         old_version_msg = msg_version()
         old_version_msg.nVersion = 31799
         old_version_msg.strSubVer = P2P_SUBVERSION
+        old_version_msg.nServices = P2P_SERVICES
         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)

test/functional/test_framework/messages.py

@@ -1022,7 +1022,7 @@ class msg_version:
 
     def __init__(self):
         self.nVersion = 0
-        self.nServices = NODE_NETWORK | NODE_WITNESS
+        self.nServices = 0
         self.nTime = int(time.time())
         self.addrTo = CAddress()
         self.addrFrom = CAddress()

test/functional/test_framework/p2p.py

@@ -83,6 +83,8 @@
 # The P2P version that this test framework implements and sends in its `version` message
 # Version 70016 supports wtxid relay
 P2P_VERSION = 70016
+# The services that this test framework offers in its `version` message
+P2P_SERVICES = NODE_NETWORK | NODE_WITNESS
 # 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
@@ -346,7 +348,7 @@ def peer_connect_send_version(self, services):
         vt.addrFrom.port = 0
         self.on_connection_send_msg = vt  # Will be sent in connection_made callback
 
-    def peer_connect(self, *args, services=NODE_NETWORK | NODE_WITNESS, send_version=True, **kwargs):
+    def peer_connect(self, *args, services=P2P_SERVICES, send_version=True, **kwargs):
         create_conn = super().peer_connect(*args, **kwargs)
 
         if send_version: