Handle runtime errors.

src/events.rs

@@ -23,6 +23,7 @@ use codec::{
     Input,
     Output,
 };
+use sp_runtime::DispatchError;
 use std::{
     collections::{
         HashMap,
@@ -77,6 +78,20 @@ pub enum EventsError {
     /// Type size unavailable.
     #[error("Type Sizes Unavailable: {0:?}")]
     TypeSizeUnavailable(String),
+    /// Dispatch error.
+    #[error("Dispatch error: {0:?}")]
+    Dispatch(WrapDispatchError),
+}
+
+/// DispatchError doesn't implement std::error::Error.
+#[derive(Debug, Error)]
+#[error("{0:?}")]
+pub struct WrapDispatchError(pub DispatchError);
+
+impl From<DispatchError> for EventsError {
+    fn from(error: DispatchError) -> Self {
+        Self::Dispatch(WrapDispatchError(error))
+    }
 }
 
 /// Event decoder.
@@ -190,6 +205,10 @@ impl<T: System> EventsDecoder<T> {
                         // PhantomData is size 0
                         return Ok(())
                     }
+                    if name.contains("DispatchError") {
+                        let error = DispatchError::decode(input)?;
+                        return Err(error.into())
+                    }
                     if let Some(size) = self.type_sizes.get(name) {
                         let mut buf = vec![0; *size];
                         input.read(&mut buf)?;