confighelper: add getgpioevent method

Use the ConfigHelper as an intermediary to register GPIO event
pins.  This allows for parsing exceptions to be captured and
properly re-raised as Config Errors.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/components/button.py

@@ -14,7 +14,6 @@ from typing import (
 )
 if TYPE_CHECKING:
     from ..confighelper import ConfigHelper
-    from .gpio import GpioFactory
     from ..app import InternalTransport as ITransport
 
 
@@ -48,10 +47,7 @@ class GpioButton:
         self.name = config.get_name().split()[-1]
         self.itransport: ITransport = self.server.lookup_component("internal_transport")
         self.mutex = asyncio.Lock()
-        gpio: GpioFactory = self.server.load_component(config, "gpio")
-        self.gpio_event = gpio.register_gpio_event(
-            config.get('pin'), self._on_gpio_event
-        )
+        self.gpio_event = config.getgpioevent("pin", self._on_gpio_event)
         self.min_event_time = config.getfloat("minimum_event_time", 0, minval=0.0)
         debounce_period = config.getfloat("debounce_period", .05, minval=0.01)
         self.gpio_event.setup_debounce(debounce_period, self._on_gpio_error)

moonraker/confighelper.py

@@ -36,7 +36,12 @@ from typing import (
 )
 if TYPE_CHECKING:
     from .server import Server
-    from .components.gpio import GpioFactory, GpioOutputPin
+    from .components.gpio import (
+        GpioFactory,
+        GpioOutputPin,
+        GpioEvent,
+        GpioEventCallback
+    )
     from .components.template import TemplateFactory
     _T = TypeVar("_T")
     ConfigVal = Union[None, int, float, bool, str, dict, list]
@@ -141,10 +146,10 @@ class ConfigHelper:
                 raise ConfigError(str(e)) from None
             val = default
             section = self.section
-        except Exception:
+        except Exception as e:
             raise ConfigError(
-                f"Error parsing option ({option}) from "
-                f"section [{self.section}]")
+                f"Error parsing option ({option}) from section [{self.section}]"
+            ) from e
         else:
             if deprecate:
                 self.server.add_warning(
@@ -360,7 +365,7 @@ class ConfigHelper:
                    deprecate: bool = False
                    ) -> Union[GpioOutputPin, _T]:
         try:
-            gpio: GpioFactory = self.server.load_component(self, 'gpio')
+            gpio: GpioFactory = self.server.load_component(self, "gpio")
         except Exception:
             raise ConfigError(
                 f"Section [{self.section}], option '{option}', "
@@ -372,6 +377,28 @@ class ConfigHelper:
         return self._get_option(getgpio_wrapper, option, default,
                                 deprecate=deprecate)
 
+    def getgpioevent(
+        self,
+        option: str,
+        event_callback: GpioEventCallback,
+        default: Union[Sentinel, _T] = Sentinel.MISSING,
+        deprecate: bool = False
+    ) -> Union[GpioEvent, _T]:
+        try:
+            gpio: GpioFactory = self.server.load_component(self, "gpio")
+        except Exception:
+            raise ConfigError(
+                f"Section [{self.section}], option '{option}', "
+                "GPIO Component not available"
+            )
+
+        def getgpioevent_wrapper(sec: str, opt: str) -> GpioEvent:
+            val = self.config.get(sec, opt)
+            return gpio.register_gpio_event(val, event_callback)
+        return self._get_option(
+            getgpioevent_wrapper, option, default, deprecate=deprecate
+        )
+
     def gettemplate(self,
                     option: str,
                     default: Union[Sentinel, _T] = Sentinel.MISSING,