add a time-out of adding more transactions to blocks (#19134)

Author: arvidn

chia/full_node/full_node_api.py

@@ -878,10 +878,17 @@ async def declare_proof_of_space(
                         # when the hard fork activates, block generators are
                         # allowed to be serialized with the improved CLVM
                         # serialization format, supporting back-references
+                        start_time = time.monotonic()
                         if peak.height >= self.full_node.constants.HARD_FORK_HEIGHT:
                             block_generator = simple_solution_generator_backrefs(spend_bundle)
                         else:
                             block_generator = simple_solution_generator(spend_bundle)
+                        end_time = time.monotonic()
+                        duration = end_time - start_time
+                        self.log.log(
+                            logging.INFO if duration < 1 else logging.WARNING,
+                            f"serializing block generator took {duration:0.2f} seconds",
+                        )
 
             def get_plot_sig(to_sign: bytes32, _extra: G1Element) -> G2Element:
                 if to_sign == request.challenge_chain_sp:

chia/full_node/mempool.py

@@ -501,6 +501,11 @@ async def create_bundle_from_mempool_items(
             name = bytes32(row[0])
             fee = int(row[1])
             item = self._items[name]
+
+            current_time = monotonic()
+            if current_time - bundle_creation_start > 1:
+                log.info(f"exiting early, already spent {current_time - bundle_creation_start:0.2f} s")
+                break
             if not item_inclusion_filter(name):
                 continue
             try: