Merge bitcoin/bitcoin#27944: test: various USDT functional test cleanups (27831 follow-ups)

9f55773a370a0d039e727445ccee6b84e05f562a test: refactor: usdt_mempool: store all events (stickies-v)
bc432704505eb165dd86de39ea3434c6fb7a2514 test: refactor: remove unnecessary nonlocal (stickies-v)
326db63a6819813db55ba0d01ab4fe80f7a0d818 test: log sanity check assertion failures (stickies-v)
f5525ad6808df6afc38e5c6e4767ab577e30629c test: store utxocache events (stickies-v)
f1b99ac94fb77340c4d3a5b4bbc3df28009bc773 test: refactor: deduplicate handle_utxocache_* logic (stickies-v)
ad90ba36bd930f00753643cd1fe0af72d1c828c2 test: refactor:  rename inbound to is_inbound (stickies-v)
afc0224cdbe73e326addf5fb98a3e95d941f2104 test: refactor: remove unnecessary blocks_checked counter (stickies-v)

Pull request description:

  Various cleanups to the USDT functional tests, largely (but not exclusively) follow-ups to https://github.com/bitcoin/bitcoin/pull/27831#pullrequestreview-1491438045. Except for slightly different logging behaviour in "test: store utxocache events" and "test: log sanity check assertion failures", this is a refactor PR, removing unnecessary code and (imo) making it more readable and maintainable.

  The rationale for each change is in the corresponding commit message.

  Note: except for "test: store utxocache events" (which relies on its parent, and I separated into two commits because we may want the parent but not the child), all commits are stand-alone and I'm okay with dropping one/multiple commits if they turn out to be controversial or undesired.

ACKs for top commit:
  0xB10C:
    ACK 9f55773a370a0d039e727445ccee6b84e05f562a. Reviewed the code and ran the USDT interface tests. I stepped through the commits and think all changes are reasonable.

Tree-SHA512: 6c37a0265b6c26d4f9552a056a690b8f86f7304bd33b4419febd8b17369cf6af799cb87c16df35d0c2a1b839ad31de24661d4384eafa88816c2051c522fd3bf5

1 files changed, 5 insertions, 6 deletions

diff --git a/test/functional/interface_usdt_net.py b/test/functional/interface_usdt_net.py
index d1f94637c9..e15ac3c1f2 100755
--- a/test/functional/interface_usdt_net.py
+++ b/test/functional/interface_usdt_net.py
@@ -121,11 +121,11 @@ class NetTracepointTest(BitcoinTestFramework):
         checked_outbound_version_msg = 0
         events = []
 
-        def check_p2p_message(event, inbound):
+        def check_p2p_message(event, is_inbound):
             nonlocal checked_inbound_version_msg, checked_outbound_version_msg
             if event.msg_type.decode("utf-8") == "version":
                 self.log.info(
-                    f"check_p2p_message(): {'inbound' if inbound else 'outbound'} {event}")
+                    f"check_p2p_message(): {'inbound' if is_inbound else 'outbound'} {event}")
                 peer = self.nodes[0].getpeerinfo()[0]
                 msg = msg_version()
                 msg.deserialize(BytesIO(bytes(event.msg[:event.msg_size])))
@@ -133,13 +133,12 @@ class NetTracepointTest(BitcoinTestFramework):
                 assert_equal(peer["addr"], event.peer_addr.decode("utf-8"))
                 assert_equal(peer["connection_type"],
                              event.peer_conn_type.decode("utf-8"))
-                if inbound:
+                if is_inbound:
                     checked_inbound_version_msg += 1
                 else:
                     checked_outbound_version_msg += 1
 
         def handle_inbound(_, data, __):
-            nonlocal events
             event = ctypes.cast(data, ctypes.POINTER(P2PMessage)).contents
             events.append((event, True))
 
@@ -157,8 +156,8 @@ class NetTracepointTest(BitcoinTestFramework):
 
         self.log.info(
             "check receipt and content of in- and outbound version messages")
-        for event, inbound in events:
-            check_p2p_message(event, inbound)
+        for event, is_inbound in events:
+            check_p2p_message(event, is_inbound)
         assert_equal(EXPECTED_INOUTBOUND_VERSION_MSG,
                      checked_inbound_version_msg)
         assert_equal(EXPECTED_INOUTBOUND_VERSION_MSG,