Include update info in logging output (#664)

* Make LoggerAdapter behavior identical to merge_extra=True
* Add update info to logging `extra`

temporalio/workflow.py

@@ -500,6 +500,14 @@ class UpdateInfo:
     name: str
     """Update type name."""
 
+    @property
+    def _logger_details(self) -> Mapping[str, Any]:
+        """Data to be included in string appended to default logging output."""
+        return {
+            "update_id": self.id,
+            "update_name": self.name,
+        }
+
 
 class _Runtime(ABC):
     @staticmethod
@@ -1211,6 +1219,10 @@ class LoggerAdapter(logging.LoggerAdapter):
             use by others. Default is False.
         log_during_replay: Boolean for whether logs should occur during replay.
             Default is False.
+
+    Values added to ``extra`` are merged with the ``extra`` dictionary from a
+    logging call, with values from the logging call taking precedence. I.e. the
+    behavior is that of `merge_extra=True` in Python >= 3.13.
     """
 
     def __init__(
@@ -1232,20 +1244,28 @@ def process(
             or self.workflow_info_on_extra
             or self.full_workflow_info_on_extra
         ):
+            extra: Dict[str, Any] = {}
+            msg_extra: Dict[str, Any] = {}
             runtime = _Runtime.maybe_current()
             if runtime:
+                workflow_details = runtime.logger_details
                 if self.workflow_info_on_message:
-                    msg = f"{msg} ({runtime.logger_details})"
+                    msg_extra.update(workflow_details)
                 if self.workflow_info_on_extra:
-                    # Extra can be absent or None, this handles both
-                    extra = kwargs.get("extra", None) or {}
-                    extra["temporal_workflow"] = runtime.logger_details
-                    kwargs["extra"] = extra
+                    extra["temporal_workflow"] = workflow_details
                 if self.full_workflow_info_on_extra:
-                    # Extra can be absent or None, this handles both
-                    extra = kwargs.get("extra", None) or {}
                     extra["workflow_info"] = runtime.workflow_info()
-                    kwargs["extra"] = extra
+            update_info = current_update_info()
+            if update_info:
+                update_details = update_info._logger_details
+                if self.workflow_info_on_message:
+                    msg_extra.update(update_details)
+                if self.workflow_info_on_extra:
+                    extra.setdefault("temporal_workflow", {}).update(update_details)
+
+        kwargs["extra"] = {**extra, **(kwargs.get("extra") or {})}
+        if msg_extra:
+            msg = f"{msg} ({msg_extra})"
         return (msg, kwargs)
 
     def isEnabledFor(self, level: int) -> bool:

tests/worker/test_workflow.py

@@ -1908,6 +1908,10 @@ def my_signal(self, value: str) -> None:
         self._last_signal = value
         workflow.logger.info(f"Signal: {value}")
 
+    @workflow.update
+    def my_update(self, value: str) -> None:
+        workflow.logger.info(f"Update: {value}")
+
     @workflow.query
     def last_signal(self) -> str:
         return self._last_signal
@@ -1955,14 +1959,22 @@ async def test_workflow_logging(client: Client, env: WorkflowEnvironment):
                 id=f"workflow-{uuid.uuid4()}",
                 task_queue=worker.task_queue,
             )
-            # Send a couple signals
+            # Send some signals and updates
             await handle.signal(LoggingWorkflow.my_signal, "signal 1")
             await handle.signal(LoggingWorkflow.my_signal, "signal 2")
+            await handle.execute_update(
+                LoggingWorkflow.my_update, "update 1", id="update-1"
+            )
+            await handle.execute_update(
+                LoggingWorkflow.my_update, "update 2", id="update-2"
+            )
             assert "signal 2" == await handle.query(LoggingWorkflow.last_signal)
 
-        # Confirm two logs happened
+        # Confirm logs were produced
         assert capturer.find_log("Signal: signal 1 ({'attempt':")
         assert capturer.find_log("Signal: signal 2")
+        assert capturer.find_log("Update: update 1")
+        assert capturer.find_log("Update: update 2")
         assert not capturer.find_log("Signal: signal 3")
         # Also make sure it has some workflow info and correct funcName
         record = capturer.find_log("Signal: signal 1")
@@ -1974,6 +1986,15 @@ async def test_workflow_logging(client: Client, env: WorkflowEnvironment):
         )
         # Since we enabled full info, make sure it's there
         assert isinstance(record.__dict__["workflow_info"], workflow.Info)
+        # Check the log emitted by the update execution.
+        record = capturer.find_log("Update: update 1")
+        assert (
+            record
+            and record.__dict__["temporal_workflow"]["update_id"] == "update-1"
+            and record.__dict__["temporal_workflow"]["update_name"] == "my_update"
+            and "'update_id': 'update-1'" in record.message
+            and "'update_name': 'my_update'" in record.message
+        )
 
         # Clear queue and start a new one with more signals
         capturer.log_queue.queue.clear()
@@ -1983,7 +2004,7 @@ async def test_workflow_logging(client: Client, env: WorkflowEnvironment):
             task_queue=worker.task_queue,
             max_cached_workflows=0,
         ) as worker:
-            # Send a couple signals
+            # Send signals and updates
             await handle.signal(LoggingWorkflow.my_signal, "signal 3")
             await handle.signal(LoggingWorkflow.my_signal, "finish")
             await handle.result()