Get workspace compiling via 'cargo check'

metadata/src/lib.rs

@@ -25,6 +25,7 @@ mod utils;
 use alloc::borrow::Cow;
 use alloc::collections::BTreeMap;
 use alloc::string::{String, ToString};
+use alloc::sync::Arc;
 use alloc::vec::Vec;
 use frame_decode::constants::{ConstantEntry, ConstantInfo, ConstantInfoError};
 use frame_decode::custom_values::{CustomValue, CustomValueInfo, CustomValueInfoError};
@@ -58,6 +59,9 @@ pub use from::legacy::Error as LegacyFromError;
 
 type CustomMetadataInner = frame_metadata::v15::CustomMetadata<PortableForm>;
 
+/// Metadata is often passed around wrapped in an [`Arc`] so that it can be cheaply cloned.
+pub type ArcMetadata = Arc<Metadata>;
+
 /// Node metadata. This can be constructed by providing some compatible [`frame_metadata`]
 /// which is then decoded into this. We aim to preserve all of the existing information in
 /// the incoming metadata while optimizing the format a little for Subxt's use cases.
@@ -370,6 +374,12 @@ impl frame_decode::custom_values::CustomValueEntryInfo for Metadata {
 }
 
 impl Metadata {
+    /// Metadata tends to be passed around wrapped in an [`Arc`] so that it can be
+    /// cheaply cloned. This is a shorthand to return that.
+    pub fn arc(self) -> ArcMetadata {
+        Arc::new(self)
+    }
+
     /// This is essentially an alias for `<Metadata as codec::Decode>::decode(&mut bytes)`
     pub fn decode_from(mut bytes: &[u8]) -> Result<Self, codec::Error> {
         <Self as codec::Decode>::decode(&mut bytes)