added indexing to handle tuple (#468)

closes #444

With PR for dodal at
DiamondLightSource/dodal#550

---------

Co-authored-by: Callum Forrester <[email protected]>

src/blueapi/core/context.py

@@ -7,14 +7,13 @@
 from typing import Any, Generic, TypeVar, Union, get_args, get_origin, get_type_hints
 
 from bluesky.run_engine import RunEngine
+from dodal.utils import make_all_devices
+from ophyd_async.core import NotConnected
 from pydantic import create_model
 from pydantic.fields import FieldInfo, ModelField
 
 from blueapi.config import EnvironmentConfig, SourceKind
-from blueapi.utils import (
-    BlueapiPlanModelConfig,
-    load_module_all,
-)
+from blueapi.utils import BlueapiPlanModelConfig, load_module_all
 
 from .bluesky_types import (
     BLUESKY_PROTOCOLS,
@@ -104,11 +103,19 @@ def with_device_module(self, module: ModuleType) -> None:
         self.with_dodal_module(module)
 
     def with_dodal_module(self, module: ModuleType, **kwargs) -> None:
-        from dodal.utils import make_all_devices
+        devices, exceptions = make_all_devices(module, **kwargs)
 
-        for device in make_all_devices(module, **kwargs).values():
+        for device in devices.values():
             self.device(device)
 
+        # If exceptions have occurred, we log them but we do not make blueapi
+        # fall over
+        if len(exceptions) > 0:
+            LOGGER.warning(
+                f"{len(exceptions)} exceptions occurred while instantiating devices"
+            )
+            LOGGER.exception(NotConnected(exceptions))
+
     def plan(self, plan: PlanGenerator) -> PlanGenerator:
         """
         Register the argument as a plan in the context. Can be used as a decorator e.g.

src/blueapi/startup/example_devices.py

@@ -72,3 +72,10 @@ def current_det(
         Imax=1,
         labels={"detectors"},
     )
+
+
+def unplugged_motor(name="unplugged_motor") -> SynAxisWithMotionEvents:
+    raise TimeoutError(
+        "This device is supposed to fail, blueapi "
+        "will mark it as not present and start up regardless"
+    )

tests/core/fake_device_module_failing.py

@@ -0,0 +1,5 @@
+from ophyd import EpicsMotor
+
+
+def failing_device() -> EpicsMotor:
+    raise TimeoutError("FooBar")

tests/core/test_context.py

@@ -8,6 +8,7 @@
 from dls_bluesky_core.core import MsgGenerator, PlanGenerator, inject
 from ophyd.sim import SynAxis, SynGauss
 from pydantic import ValidationError, parse_obj_as
+from pytest import LogCaptureFixture
 
 from blueapi.config import EnvironmentConfig, Source, SourceKind
 from blueapi.core import BlueskyContext, is_bluesky_compatible_device
@@ -174,6 +175,19 @@ def test_add_devices_from_module(empty_context: BlueskyContext) -> None:
     } == empty_context.devices.keys()
 
 
+def test_add_failing_deivces_from_module(
+    caplog: LogCaptureFixture, empty_context: BlueskyContext
+) -> None:
+    import tests.core.fake_device_module_failing as device_module
+
+    caplog.set_level(10)
+    empty_context.with_device_module(device_module)
+    logs = caplog.get_records("call")
+
+    assert any("TimeoutError: FooBar" in log.message for log in logs)
+    assert len(empty_context.devices.keys()) == 0
+
+
 def test_extra_kwargs_in_with_dodal_module_passed_to_make_all_devices(
     empty_context: BlueskyContext,
 ) -> None:
@@ -182,7 +196,10 @@ def test_extra_kwargs_in_with_dodal_module_passed_to_make_all_devices(
     """
     import tests.core.fake_device_module as device_module
 
-    with patch("dodal.utils.make_all_devices") as mock_make_all_devices:
+    with patch(
+        "blueapi.core.context.make_all_devices",
+        return_value=({}, {}),
+    ) as mock_make_all_devices:
         empty_context.with_dodal_module(
             device_module, some_argument=1, another_argument="two"
         )