Adjust blocking I/O messages to provide developer help (#120113)

homeassistant/util/loop.py

@@ -31,14 +31,9 @@ def raise_for_blocking_call(
     check_allowed: Callable[[dict[str, Any]], bool] | None = None,
     strict: bool = True,
     strict_core: bool = True,
-    advise_msg: str | None = None,
     **mapped_args: Any,
 ) -> None:
-    """Warn if called inside the event loop. Raise if `strict` is True.
-
-    The default advisory message is 'Use `await hass.async_add_executor_job()'
-    Set `advise_msg` to an alternate message if the solution differs.
-    """
+    """Warn if called inside the event loop. Raise if `strict` is True."""
     if check_allowed is not None and check_allowed(mapped_args):
         return
 
@@ -55,24 +50,31 @@ def raise_for_blocking_call(
         if not strict_core:
             _LOGGER.warning(
                 "Detected blocking call to %s with args %s in %s, "
-                "line %s: %s inside the event loop\n"
+                "line %s: %s inside the event loop; "
+                "This is causing stability issues. "
+                "Please create a bug report at "
+                "https://github.com/home-assistant/core/issues?q=is%%3Aopen+is%%3Aissue\n"
+                "%s\n"
                 "Traceback (most recent call last):\n%s",
                 func.__name__,
                 mapped_args.get("args"),
                 offender_filename,
                 offender_lineno,
                 offender_line,
+                _dev_help_message(func.__name__),
                 "".join(traceback.format_stack(f=offender_frame)),
             )
             return
 
         if found_frame is None:
             raise RuntimeError(  # noqa: TRY200
-                f"Detected blocking call to {func.__name__} inside the event loop "
-                f"in {offender_filename}, line {offender_lineno}: {offender_line}. "
-                f"{advise_msg or 'Use `await hass.async_add_executor_job()`'}; "
-                "This is causing stability issues. Please create a bug report at "
-                f"https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue"
+                f"Caught blocking call to {func.__name__} with args {mapped_args.get("args")} "
+                f"in {offender_filename}, line {offender_lineno}: {offender_line} "
+                "inside the event loop; "
+                "This is causing stability issues. "
+                "Please create a bug report at "
+                "https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue\n"
+                f"{_dev_help_message(func.__name__)}"
             )
 
     report_issue = async_suggest_report_issue(
@@ -82,10 +84,13 @@ def raise_for_blocking_call(
     )
 
     _LOGGER.warning(
-        "Detected blocking call to %s inside the event loop by %sintegration '%s' "
+        "Detected blocking call to %s with args %s "
+        "inside the event loop by %sintegration '%s' "
         "at %s, line %s: %s (offender: %s, line %s: %s), please %s\n"
+        "%s\n"
         "Traceback (most recent call last):\n%s",
         func.__name__,
+        mapped_args.get("args"),
         "custom " if integration_frame.custom_integration else "",
         integration_frame.integration,
         integration_frame.relative_filename,
@@ -95,19 +100,32 @@ def raise_for_blocking_call(
         offender_lineno,
         offender_line,
         report_issue,
+        _dev_help_message(func.__name__),
         "".join(traceback.format_stack(f=integration_frame.frame)),
     )
 
     if strict:
         raise RuntimeError(
-            "Blocking calls must be done in the executor or a separate thread;"
-            f" {advise_msg or 'Use `await hass.async_add_executor_job()`'}; at"
-            f" {integration_frame.relative_filename}, line {integration_frame.line_number}:"
-            f" {integration_frame.line} "
-            f"(offender: {offender_filename}, line {offender_lineno}: {offender_line})"
+            "Caught blocking call to {func.__name__} with args "
+            f"{mapped_args.get('args')} inside the event loop by"
+            f"{'custom ' if integration_frame.custom_integration else ''}"
+            "integration '{integration_frame.integration}' at "
+            f"{integration_frame.relative_filename}, line {integration_frame.line_number}:"
+            f" {integration_frame.line}. (offender: {offender_filename}, line "
+            f"{offender_lineno}: {offender_line}), please {report_issue}\n"
+            f"{_dev_help_message(func.__name__)}"
         )
 
 
+def _dev_help_message(what: str) -> str:
+    """Generate help message to guide developers."""
+    return (
+        "For developers, please see "
+        "https://developers.home-assistant.io/docs/asyncio_blocking_operations/"
+        f"#{what.replace('.', '')}"
+    )
+
+
 def protect_loop[**_P, _R](
     func: Callable[_P, _R],
     loop_thread_id: int,

tests/test_block_async_io.py

@@ -61,9 +61,7 @@ async def test_protect_loop_sleep() -> None:
         ]
     )
     with (
-        pytest.raises(
-            RuntimeError, match="Detected blocking call to sleep inside the event loop"
-        ),
+        pytest.raises(RuntimeError, match="Caught blocking call to sleep with args"),
         patch(
             "homeassistant.block_async_io.get_current_frame",
             return_value=frames,
@@ -89,9 +87,7 @@ async def test_protect_loop_sleep_get_current_frame_raises() -> None:
         ]
     )
     with (
-        pytest.raises(
-            RuntimeError, match="Detected blocking call to sleep inside the event loop"
-        ),
+        pytest.raises(RuntimeError, match="Caught blocking call to sleep with args"),
         patch(
             "homeassistant.block_async_io.get_current_frame",
             side_effect=ValueError,
@@ -204,7 +200,8 @@ async def test_protect_loop_importlib_import_module_in_integration(
             importlib.import_module("not_loaded_module")
 
     assert (
-        "Detected blocking call to import_module inside the event loop by "
+        "Detected blocking call to import_module with args ('not_loaded_module',) "
+        "inside the event loop by "
         "integration 'hue' at homeassistant/components/hue/light.py, line 23"
     ) in caplog.text
 

tests/util/test_loop.py

@@ -28,6 +28,14 @@ async def test_raise_for_blocking_call_async_non_strict_core(
     haloop.raise_for_blocking_call(banned_function, strict_core=False)
     assert "Detected blocking call to banned_function" in caplog.text
     assert "Traceback (most recent call last)" in caplog.text
+    assert (
+        "Please create a bug report at https://github.com/home-assistant/core/issues"
+        in caplog.text
+    )
+    assert (
+        "For developers, please see "
+        "https://developers.home-assistant.io/docs/asyncio_blocking_operations/#banned_function"
+    ) in caplog.text
 
 
 async def test_raise_for_blocking_call_async_integration(
@@ -74,12 +82,17 @@ async def test_raise_for_blocking_call_async_integration(
     ):
         haloop.raise_for_blocking_call(banned_function)
     assert (
-        "Detected blocking call to banned_function inside the event loop by integration"
+        "Detected blocking call to banned_function with args None"
+        " inside the event loop by integration"
         " 'hue' at homeassistant/components/hue/light.py, line 23: self.light.is_on "
         "(offender: /home/paulus/aiohue/lights.py, line 2: mock_line), please create "
         "a bug report at https://github.com/home-assistant/core/issues?"
         "q=is%3Aopen+is%3Aissue+label%3A%22integration%3A+hue%22" in caplog.text
     )
+    assert (
+        "For developers, please see "
+        "https://developers.home-assistant.io/docs/asyncio_blocking_operations/#banned_function"
+    ) in caplog.text
 
 
 async def test_raise_for_blocking_call_async_integration_non_strict(
@@ -125,7 +138,8 @@ async def test_raise_for_blocking_call_async_integration_non_strict(
     ):
         haloop.raise_for_blocking_call(banned_function, strict=False)
     assert (
-        "Detected blocking call to banned_function inside the event loop by integration"
+        "Detected blocking call to banned_function with args None"
+        " inside the event loop by integration"
         " 'hue' at homeassistant/components/hue/light.py, line 23: self.light.is_on "
         "(offender: /home/paulus/aiohue/lights.py, line 2: mock_line), "
         "please create a bug report at https://github.com/home-assistant/core/issues?"
@@ -136,6 +150,14 @@ async def test_raise_for_blocking_call_async_integration_non_strict(
         'File "/home/paulus/homeassistant/components/hue/light.py", line 23'
         in caplog.text
     )
+    assert (
+        "please create a bug report at https://github.com/home-assistant/core/issues"
+        in caplog.text
+    )
+    assert (
+        "For developers, please see "
+        "https://developers.home-assistant.io/docs/asyncio_blocking_operations/#banned_function"
+    ) in caplog.text
 
 
 async def test_raise_for_blocking_call_async_custom(
@@ -182,7 +204,8 @@ async def test_raise_for_blocking_call_async_custom(
     ):
         haloop.raise_for_blocking_call(banned_function)
     assert (
-        "Detected blocking call to banned_function inside the event loop by custom "
+        "Detected blocking call to banned_function with args None"
+        " inside the event loop by custom "
         "integration 'hue' at custom_components/hue/light.py, line 23: self.light.is_on"
         " (offender: /home/paulus/aiohue/lights.py, line 2: mock_line), "
         "please create a bug report at https://github.com/home-assistant/core/issues?"
@@ -193,6 +216,10 @@ async def test_raise_for_blocking_call_async_custom(
         'File "/home/paulus/config/custom_components/hue/light.py", line 23'
         in caplog.text
     )
+    assert (
+        "For developers, please see "
+        "https://developers.home-assistant.io/docs/asyncio_blocking_operations/#banned_function"
+    ) in caplog.text
 
 
 async def test_raise_for_blocking_call_sync(