Remember exceptions that are logged and filter out duplicates.

This fixes #724

CHANGES

@@ -1,3 +1,10 @@
+Version 5.10.2
+--------------
+
+* Remember exceptions in flight until the context is cleared so that two
+  reports with the same exception data do not result in two errors
+  being logged.
+
 Version 5.10.1
 --------------
 

raven/base.py

@@ -282,6 +282,20 @@ class Client(object):
             return url
         return '%s:%s' % (scheme, url)
 
+    def _get_exception_key(self, exc_info):
+        return (
+            id(exc_info[1]),
+            id(exc_info[2]),
+        )
+
+    def skip_error_for_logging(self, exc_info):
+        key = self._get_exception_key(exc_info)
+        return key in self.context.exceptions_to_skip
+
+    def record_exception_seen(self, exc_info):
+        key = self._get_exception_key(exc_info)
+        self.context.exceptions_to_skip.add(key)
+
     def build_msg(self, event_type, data=None, date=None,
                   time_spent=None, extra=None, stack=None, public_key=None,
                   tags=None, fingerprint=None, **kwargs):
@@ -530,6 +544,12 @@ class Client(object):
         if not self.is_enabled():
             return
 
+        exc_info = kwargs.get('exc_info')
+        if exc_info is not None:
+            if self.skip_error_for_logging(exc_info):
+                return
+            self.record_exception_seen(exc_info)
+
         data = self.build_msg(
             event_type, data, date, time_spent, extra, stack, tags=tags,
             **kwargs)
@@ -701,6 +721,8 @@ class Client(object):
 
         ``kwargs`` are passed through to ``.capture``.
         """
+        if exc_info is None:
+            exc_info = sys.exc_info()
         return self.capture(
             'raven.events.Exception', exc_info=exc_info, **kwargs)
 

raven/context.py

@@ -27,6 +27,7 @@ class Context(local, Mapping, Iterable):
     """
     def __init__(self):
         self.data = {}
+        self.exceptions_to_skip = set()
 
     def __getitem__(self, key):
         return self.data[key]
@@ -58,3 +59,4 @@ class Context(local, Mapping, Iterable):
 
     def clear(self):
         self.data = {}
+        self.exceptions_to_skip.clear()

tests/contrib/flask/tests.py

@@ -9,6 +9,7 @@ from flask.ext.login import LoginManager, AnonymousUserMixin, login_user
 from raven.base import Client
 from raven.contrib.flask import Sentry
 from raven.utils.testutils import TestCase
+from raven.handlers.logging import SentryHandler
 
 
 class TempStoreClient(Client):
@@ -125,6 +126,12 @@ class FlaskTest(BaseTest):
         self.assertEquals(event['message'], 'ValueError: hello world')
         self.assertEquals(event['culprit'], 'tests.contrib.flask.tests in an_error')
 
+    def test_capture_plus_logging(self):
+        client, raven, app = self.make_client_and_raven(debug=False)
+        app.logger.addHandler(SentryHandler(raven))
+        client.get('/an-error/')
+        assert len(raven.events) == 1
+
     def test_get(self):
         response = self.client.get('/an-error/?foo=bar')
         self.assertEquals(response.status_code, 500)