Restrict length of exception messages

CHANGELOG.asciidoc

@@ -41,6 +41,7 @@ endif::[]
 
 * Differentiate Lambda URLs from API Gateway in AWS Lambda integration {pull}#1609[#1609]
 * Restrict the size of Django request bodies to prevent APM Server rejection {pull}#1610[#1610]
+* Restrict length of `exception.message` for exceptions captured by the agent {pull}#1619[#1619]
 
 
 

elasticapm/events.py

@@ -33,7 +33,7 @@
 import sys
 
 from elasticapm.conf.constants import EXCEPTION_CHAIN_MAX_DEPTH
-from elasticapm.utils import varmap
+from elasticapm.utils import encoding, varmap
 from elasticapm.utils.encoding import keyword_field, shorten, to_unicode
 from elasticapm.utils.logging import get_logger
 from elasticapm.utils.stacks import get_culprit, get_stack_info, iter_traceback_frames
@@ -133,6 +133,8 @@ def capture(client, exc_info=None, **kwargs):
  else:
  message = "%s: %s" % (exc_type, to_unicode(exc_value)) if exc_value else str(exc_type)
 
+ message = encoding.long_field(message)
+
  data = {
  "id": "%032x" % random.getrandbits(128),
  "culprit": keyword_field(culprit),

tests/client/exception_tests.py

@@ -397,3 +397,13 @@ def generate_uuid():
  generate_uuid()
  except Exception:
  elasticapm_client.capture_exception()
+
+
+def test_long_message(elasticapm_client):
+ try:
+ raise Exception("t" * 1000000)
+ except:
+ elasticapm_client.capture_exception()
+
+ exception = elasticapm_client.events[ERROR][0]
+ assert exception["exception"]["message"] == f'Exception: {"t"*9988}{"…"}'