Feat/value error on fail decode (#12)

* raise value error on fail to decode

* raise valueerror on fail to get type id

* bump ver

Author: camfairchild

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "bt_decode"
-version = "0.5.0-a0"
+version = "0.5.0-a1"
 edition = "2021"
 
 [lib]

Cargo.toml

@@ -1,6 +1,6 @@
 [project]
 name = "bt-decode"
-version = "0.5.0-a0"
+version = "0.5.0-a1"
 description = "A wrapper around the scale-codec crate for fast scale-decoding of Bittensor data structures."
 readme = "README.md"
 license = {file = "LICENSE"}

pyproject.toml

@@ -1061,10 +1061,17 @@ mod bt_decode {
         fill_memo_using_well_known_types(&mut memo, &curr_registry);
 
         let type_id: u32 = get_type_id_from_type_string(&mut memo, type_string, &mut curr_registry)
-            .expect("Failed to get type id from type string");
+            .ok_or(PyErr::new::<pyo3::exceptions::PyValueError, _>(format!(
+                "Failed to get type id from type string: {:?}",
+                type_string
+            )))?;
 
-        let decoded =
-            decode_as_type(&mut &encoded[..], type_id, &curr_registry).expect("Failed to decode");
+        let decoded = decode_as_type(&mut &encoded[..], type_id, &curr_registry).map_err(|_e| {
+            PyErr::new::<pyo3::exceptions::PyValueError, _>(format!(
+                "Failed to decode type: {:?} with type id: {:?}",
+                type_string, type_id
+            ))
+        })?;
 
         value_to_pyobject(py, decoded)
     }