Merge bitcoin/bitcoin#26007: [contrib] message-capture-parser: fix AssertionError on parsing headers message

644772b message-capture-parser: fix AssertionError on parsing `headers` message (Sebastian Falbesoner)

Pull request description:

  If a test framework message's field name is in the list of `HASH_INT_VECTORS`, we currently assume that it _always_ has to contain a vector of integers and throw otherwise:
  https://github.com/bitcoin/bitcoin/blob/0ebd4db32b39cb7c505148f090df4b7ac778c307/contrib/message-capture/message-capture-parser.py#L82-L83
  (introduced in PR #25367, commit 42bbbba).

  However, that assumption is too strict. The (de)serialization field name "headers" is used in two different message types, one for `cfcheckpt` (where it is serialized as an integer vector), and another time for `headers` (where it is serialized as a vector of `CBlockHeader`s). Parsing the latter fails as it is not an integer vector and thus triggers the assert.

  Fix this by adding the integer type check as additional condition to the `HASH_INT_VECTORS` check rather than asserting.
  Fixes #25954.

ACKs for top commit:
  glozow:
    ACK 644772b

Tree-SHA512: c98a107f6703c6c1a81771907c25bcc171c631b57fd605fbebaedd93d651e2ef02fb5601853a9bc7d659ab531c5f47770181173a36ea2b37f584aa7a37b66505

Author: MacroFake

contrib/message-capture/message-capture-parser.py

@@ -79,8 +79,7 @@ def to_jsonable(obj: Any) -> Any:
             val = getattr(obj, slot, None)
             if slot in HASH_INTS and isinstance(val, int):
                 ret[slot] = ser_uint256(val).hex()
-            elif slot in HASH_INT_VECTORS:
-                assert all(isinstance(a, int) for a in val)
+            elif slot in HASH_INT_VECTORS and all(isinstance(a, int) for a in val):
                 ret[slot] = [ser_uint256(a).hex() for a in val]
             else:
                 ret[slot] = to_jsonable(val)