Add a utility class that can be used to generate a twisted deferred aware call graph

1 files changed, 9 insertions, 1 deletions

diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py

index 3649406efb..c7d7bf2fe1 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -51,6 +51,8 @@ from synapse.rest.client.v2_alpha import ClientV2AlphaRestResource
 from daemonize import Daemonize
 import twisted.manhole.telnet
 
+from synapse.util.traceutil import Tracer
+
 import synapse
 
 import logging
@@ -61,6 +63,7 @@ import subprocess
 import sqlite3
 import syweb
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -399,8 +402,13 @@ class SynapseService(service.Service):
 
 
 def run(hs):
-
     def in_thread():
+        try:
+            tracer = Tracer()
+            sys.settrace(tracer.process)
+        except Exception:
+            logger.exception("Failed to start tracer")
+
         with LoggingContext("run"):
             change_resource_limit(hs.config.soft_file_limit)