Fix string formatting error when logging slow processing (#156)

Fixes crash in #153

Co-authored-by: Vikram Patki <54442035+patkivikram@users.noreply.github.com>

faust/transport/drivers/aiokafka.py

@@ -852,11 +852,14 @@ def _log_slow_processing_commit(self, msg: str, *args: Any) -> None:
             current_value=app.conf.broker_commit_livelock_soft_timeout,
         )
 
-    def _make_slow_processing_error(self, msg: str, causes: Iterable[str]) -> str:
+    def _make_slow_processing_error(
+        self, msg: str, causes: Iterable[str], setting: str, current_value: float
+    ) -> str:
         return " ".join(
             [
                 msg,
-                SLOW_PROCESSING_EXPLAINED,
+                SLOW_PROCESSING_EXPLAINED
+                % {"setting": setting, "current_value": current_value},
                 text.enumeration(causes, start=2, sep="\n\n"),
             ]
         )
@@ -870,10 +873,8 @@ def _log_slow_processing(
         current_value: float,
     ) -> None:
         return self.log.error(
-            self._make_slow_processing_error(msg, causes),
+            self._make_slow_processing_error(msg, causes, setting, current_value),
             *args,
-            setting=setting,
-            current_value=current_value,
         )
 
     async def position(self, tp: TP) -> Optional[int]:

tests/unit/transport/drivers/test_aiokafka.py

@@ -8,6 +8,7 @@
 import pytest
 from aiokafka.errors import CommitFailedError, IllegalStateError, KafkaError
 from aiokafka.structs import OffsetAndMetadata, TopicPartition
+from mode.utils import text
 from mode.utils.futures import done_future
 from mode.utils.mocks import ANY, AsyncMock, MagicMock, Mock, call, patch
 from opentracing.ext import tags
@@ -18,6 +19,10 @@
 from faust.sensors.monitor import Monitor
 from faust.transport.drivers import aiokafka as mod
 from faust.transport.drivers.aiokafka import (
+    SLOW_PROCESSING_CAUSE_AGENT,
+    SLOW_PROCESSING_CAUSE_STREAM,
+    SLOW_PROCESSING_EXPLAINED,
+    SLOW_PROCESSING_STREAM_IDLE_SINCE_START,
     TOPIC_LENGTH_MAX,
     AIOKafkaConsumerThread,
     Consumer,
@@ -386,6 +391,29 @@ def test_state(self, *, cthread, now):
         assert cthread.time_started == now
 
 
+class Test_Log_Slow_Processing(Test_verify_event_path_base):
+    def test_log_slow_processing_stream(
+        self, cthread: AIOKafkaConsumerThread, tp: TP, logger
+    ):
+        cthread._log_slow_processing_stream(
+            SLOW_PROCESSING_STREAM_IDLE_SINCE_START, tp, "3 seconds ago"
+        )
+        logger.error.assert_called_with(
+            SLOW_PROCESSING_STREAM_IDLE_SINCE_START
+            + " "
+            + SLOW_PROCESSING_EXPLAINED
+            % {"setting": "stream_processing_timeout", "current_value": 300.0}
+            + " "
+            + text.enumeration(
+                [SLOW_PROCESSING_CAUSE_STREAM, SLOW_PROCESSING_CAUSE_AGENT],
+                start=2,
+                sep="\n\n",
+            ),
+            tp,
+            "3 seconds ago",
+        )
+
+
 @pytest.mark.skip("Needs fixing")
 class Test_VEP_no_fetch_since_start(Test_verify_event_path_base):
     def test_just_started(self, *, cthread, now, tp, logger):