add individual liquid asset registry data endpoint

src/new_index/query.rs

@@ -271,6 +271,15 @@ impl Query {
         )
     }
 
+    #[cfg(feature = "liquid")]
+    pub fn lookup_registry_asset(&self, asset_id: &AssetId) -> Result<Option<AssetMeta>> {
+        let asset_db = self
+            .asset_db
+            .as_ref()
+            .chain_err(|| "asset registry unavailable")?;
+        Ok(asset_db.read().unwrap().get(asset_id).cloned())
+    }
+
     #[cfg(feature = "liquid")]
     pub fn list_registry_assets(
         &self,

src/rest.rs

@@ -1864,6 +1864,21 @@ fn handle_request(
                 .unwrap())
         }
 
+        #[cfg(feature = "liquid")]
+        (&Method::GET, Some(&"assets"), Some(&"registry"), Some(asset_str), None, None) => {
+            let asset_id = AssetId::from_str(asset_str)?;
+            let registry_entry = query
+                .lookup_registry_asset(&asset_id)
+                .map_err(|e| {
+                    HttpError(StatusCode::SERVICE_UNAVAILABLE, e.description().to_string())
+                })?
+                .ok_or_else(|| {
+                    HttpError::not_found("Asset id not found in registry".to_string())
+                })?;
+
+            json_response(registry_entry, TTL_SHORT)
+        }
+
         #[cfg(feature = "liquid")]
         (&Method::GET, Some(&"asset"), Some(asset_str), None, None, None) => {
             let asset_id = AssetId::from_str(asset_str)?;