Fix functional/p2p_sendheaders.py file

Author: janus

test/functional/p2p_sendheaders.py

@@ -71,19 +71,13 @@
    Expect: no response.
 
 Part 5: Test handling of headers that don't connect.
-a. Repeat 10 times:
+a. Repeat 100 times:
    1. Announce a header that doesn't connect.
       Expect: getheaders message
    2. Send headers chain.
       Expect: getdata for the missing blocks, tip update.
-b. Then send 9 more headers that don't connect.
+b. Then send 99 more headers that don't connect.
    Expect: getheaders message each time.
-c. Announce a header that does connect.
-   Expect: no response.
-d. Announce 49 headers that don't connect.
-   Expect: getheaders message each time.
-e. Announce one more that doesn't connect.
-   Expect: disconnect.
 """
 from test_framework.blocktools import create_block, create_coinbase
 from test_framework.messages import CInv
@@ -526,7 +520,8 @@ def test_nonnull_locators(self, test_node, inv_node):
         # First we test that receipt of an unconnecting header doesn't prevent
         # chain sync.
         expected_hash = tip
-        for i in range(10):
+        NUM_HEADERS = 100
+        for i in range(NUM_HEADERS):
             self.log.debug("Part 5.{}: starting...".format(i))
             test_node.last_message.pop("getdata", None)
             blocks = []
@@ -550,41 +545,24 @@ def test_nonnull_locators(self, test_node, inv_node):
         blocks = []
         # Now we test that if we repeatedly don't send connecting headers, we
         # don't go into an infinite loop trying to get them to connect.
-        MAX_NUM_UNCONNECTING_HEADERS_MSGS = 10
-        for _ in range(MAX_NUM_UNCONNECTING_HEADERS_MSGS + 1):
+        for _ in range(NUM_HEADERS + 1):
             blocks.append(create_block(tip, create_coinbase(height), block_time))
             blocks[-1].solve()
             tip = blocks[-1].sha256
             block_time += 1
             height += 1
 
-        for i in range(1, MAX_NUM_UNCONNECTING_HEADERS_MSGS):
-            # Send a header that doesn't connect, check that we get a getheaders.
+        for i in range(1, NUM_HEADERS):
+            with p2p_lock:
+                test_node.last_message.pop("getheaders", None)
+            # Send an empty header as a failed response to the received getheaders
+            # (from the previous iteration). Otherwise, the new headers will be
+            # treated as a response instead of as an announcement.
+            test_node.send_header_for_blocks([])
+            # Send the actual unconnecting header, which should trigger a new getheaders.
             test_node.send_header_for_blocks([blocks[i]])
             test_node.wait_for_getheaders(block_hash=expected_hash)
 
-        # Next header will connect, should re-set our count:
-        test_node.send_header_for_blocks([blocks[0]])
-        expected_hash = blocks[0].sha256
-
-        # Remove the first two entries (blocks[1] would connect):
-        blocks = blocks[2:]
-
-        # Now try to see how many unconnecting headers we can send
-        # before we get disconnected.  Should be 5*MAX_NUM_UNCONNECTING_HEADERS_MSGS
-        for i in range(5 * MAX_NUM_UNCONNECTING_HEADERS_MSGS - 1):
-            # Send a header that doesn't connect, check that we get a getheaders.
-            test_node.send_header_for_blocks([blocks[i % len(blocks)]])
-            test_node.wait_for_getheaders(block_hash=expected_hash)
-
-        # Eventually this stops working.
-        test_node.send_header_for_blocks([blocks[-1]])
-
-        # Should get disconnected
-        test_node.wait_for_disconnect()
-
-        self.log.info("Part 5: success!")
-
         # Finally, check that the inv node never received a getdata request,
         # throughout the test
         assert "getdata" not in inv_node.last_message