add thread name to log message prefix to trace across Protocol.deliver threads

flask_app.py

@@ -21,6 +21,11 @@ logger = logging.getLogger(__name__)
 # logging.getLogger('lexrpc').setLevel(logging.INFO)
 logging.getLogger('negotiator').setLevel(logging.WARNING)
 
+# add thread name to log prefix so we can trace log messages in
+# Protocol.deliver, which is parallelized across threads
+logging.getLogger().handlers[0].setFormatter(
+    logging.Formatter(fmt='%(levelname)s:%(name)s:%(threadName)s:%(message)s'))
+
 app_dir = Path(__file__).parent
 
 

protocol.py

@@ -824,7 +824,8 @@ class Protocol:
         errors = []  # stores (target URL, code, body) tuples
 
         # deliver to all targets, in parallel, with a thread pool
-        with ThreadPoolExecutor(max_workers=DELIVER_THREADS) as executor:
+        with ThreadPoolExecutor(max_workers=DELIVER_THREADS,
+                                thread_name_prefix='deliver') as executor:
             results = []
 
             for target, orig_obj in sorted_targets: