fix: Incorrect timeout warnings in AWS Lambda and GCP integrations (#854)

1) Added code to stop thread in aws_lambda.py & gcp.py.
2) Modified logic of run() function of class TimeoutThread to remove the dependency on time.sleep() and to stop the thread either when the original handler returns (by calling the stop method) or the timeout is reached, conditionally raising ServerlessTimeoutWarning.

Co-authored-by: Shantanu  Dhiman <shantanu.dhiman@calsoftinc.com>
Co-authored-by: Rodolfo Carvalho <rodolfo.carvalho@sentry.io>

Author: 3 people

sentry_sdk/integrations/aws_lambda.py

@@ -83,6 +83,8 @@ def sentry_handler(event, context, *args, **kwargs):
                     _make_request_event_processor(event, context, configured_time)
                 )
                 scope.set_tag("aws_region", context.invoked_function_arn.split(":")[3])
+
+                timeout_thread = None
                 # Starting the Timeout thread only if the configured time is greater than Timeout warning
                 # buffer and timeout_warning parameter is set True.
                 if (
@@ -94,7 +96,8 @@ def sentry_handler(event, context, *args, **kwargs):
                     ) / MILLIS_TO_SECONDS
 
                     timeout_thread = TimeoutThread(
-                        waiting_time, configured_time / MILLIS_TO_SECONDS
+                        waiting_time,
+                        configured_time / MILLIS_TO_SECONDS,
                     )
 
                     # Starting the thread to raise timeout warning exception
@@ -116,6 +119,9 @@ def sentry_handler(event, context, *args, **kwargs):
                     )
                     hub.capture_event(event, hint=hint)
                     reraise(*exc_info)
+                finally:
+                    if timeout_thread:
+                        timeout_thread.stop()
 
     return sentry_handler  # type: ignore
 

sentry_sdk/integrations/gcp.py

@@ -63,6 +63,7 @@ def sentry_func(functionhandler, event, *args, **kwargs):
                     _make_request_event_processor(event, configured_time, initial_time)
                 )
                 scope.set_tag("gcp_region", environ.get("FUNCTION_REGION"))
+                timeout_thread = None
                 if (
                     integration.timeout_warning
                     and configured_time > TIMEOUT_WARNING_BUFFER
@@ -93,6 +94,8 @@ def sentry_func(functionhandler, event, *args, **kwargs):
                     hub.capture_event(event, hint=hint)
                     reraise(*exc_info)
                 finally:
+                    if timeout_thread:
+                        timeout_thread.stop()
                     # Flush out the event queue
                     hub.flush()
 

sentry_sdk/utils.py

@@ -3,7 +3,6 @@
 import logging
 import os
 import sys
-import time
 import threading
 
 from datetime import datetime
@@ -891,11 +890,19 @@ def __init__(self, waiting_time, configured_timeout):
         threading.Thread.__init__(self)
         self.waiting_time = waiting_time
         self.configured_timeout = configured_timeout
+        self._stop_event = threading.Event()
+
+    def stop(self):
+        # type: () -> None
+        self._stop_event.set()
 
     def run(self):
         # type: () -> None
 
-        time.sleep(self.waiting_time)
+        self._stop_event.wait(self.waiting_time)
+
+        if self._stop_event.is_set():
+            return
 
         integer_configured_timeout = int(self.configured_timeout)