Merge #19010: net processing: Add support for getcfheaders

5308c97cca [test] Add test for cfheaders (Jim Posen)
f6b58c1506 [net processing] Message handling for getcfheaders. (Jim Posen)
3bdc7c2d39 [doc] Add comment for m_headers_cache (John Newbery)

Pull request description:

  Support `getcfheaders` requests when `-peerblockfilters` is set.

  Does not advertise compact filter support in version messages.

ACKs for top commit:
  jkczyz:
    ACK 5308c97cca
  MarcoFalke:
    re-ACK 5308c97cca , only change is doc related 🗂
  theStack:
    ACK 5308c97cca 🚀

Tree-SHA512: 240fc654f6f634c191d9f7628b6c4801f87ed514a1dd55c7de5d454d4012d1c09509a2d5a246bc7da445cd920252b4cd56a493c060cdb207b04af4ffe53b95f7

test/functional/test_framework/mininode.py

@@ -31,6 +31,7 @@ from test_framework.messages import (
     msg_block,
     MSG_BLOCK,
     msg_blocktxn,
+    msg_cfheaders,
     msg_cfcheckpt,
     msg_cmpctblock,
     msg_feefilter,
@@ -68,6 +69,7 @@ MESSAGEMAP = {
     b"addr": msg_addr,
     b"block": msg_block,
     b"blocktxn": msg_blocktxn,
+    b"cfheaders": msg_cfheaders,
     b"cfcheckpt": msg_cfcheckpt,
     b"cmpctblock": msg_cmpctblock,
     b"feefilter": msg_feefilter,
@@ -330,6 +332,7 @@ class P2PInterface(P2PConnection):
     def on_addr(self, message): pass
     def on_block(self, message): pass
     def on_blocktxn(self, message): pass
+    def on_cfheaders(self, message): pass
     def on_cfcheckpt(self, message): pass
     def on_cmpctblock(self, message): pass
     def on_feefilter(self, message): pass