chore(home-assistant): streamline Python conversion for UnexpectedState

home-assistant/src/state/unexpected_state.rs

@@ -1,35 +1,14 @@
-use std::sync::Arc;
+use std::{convert::Infallible, str::FromStr, sync::Arc};
 
-use pyo3::{exceptions::PyException, prelude::*};
-use snafu::{ResultExt, Snafu};
+use python_utils::{FromPyFromStr, ToStrToPy};
 
-#[derive(Debug, Clone, derive_more::Display)]
+#[derive(Debug, Clone, derive_more::Display, FromPyFromStr, ToStrToPy)]
 pub struct UnexpectedState(pub Arc<str>);
 
-#[derive(Debug, Snafu)]
-pub enum ExtractUnexpectedStateError {
-    /// couldn't extract the object as a string
-    ExtractStringError { source: PyErr },
-}
+impl FromStr for UnexpectedState {
+    type Err = Infallible;
 
-impl From<ExtractUnexpectedStateError> for PyErr {
-    fn from(error: ExtractUnexpectedStateError) -> Self {
-        match &error {
-            ExtractUnexpectedStateError::ExtractStringError { .. } => {
-                PyException::new_err(error.to_string())
-            }
-        }
-    }
-}
-
-// TODO: replace with a derive(PyFromStr) (analogous to serde_with::DeserializeFromStr) once I make one
-impl<'a, 'py> FromPyObject<'a, 'py> for UnexpectedState {
-    type Error = ExtractUnexpectedStateError;
-
-    fn extract(ob: Borrowed<'a, 'py, PyAny>) -> Result<Self, Self::Error> {
-        let s = ob.extract::<String>().context(ExtractStringSnafu)?;
-        let s = s.into();
-
-        Ok(UnexpectedState(s))
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(Self(s.into()))
     }
 }