feat(get-rmrks): [as-derivative]

Get RMRKs from `utility.asDerivative` calls.

src/tools/utils.ts

@@ -150,6 +150,22 @@ export const isUtilityBatch = (call: TCall) =>
   call.section === "utility" &&
   (call.method === "batch" || call.method === "batchAll");
 
+export const hasInnerCall = (call: TCall): boolean =>
+  call.section === "utility" && call.method === "asDerivative";
+
+export const getInnerCall = (call: TCall) => {
+  const sectionMethod = `${call.section}.${call.method}`;
+  switch (sectionMethod) {
+    case ("utility.asDerivative"): {
+      return call.args[1];
+    }
+
+    default: {
+      throw new Error(`Cannot get inner call from ${sectionMethod}.`);
+    }
+  }
+};
+
 export const getBlockCallsFromSignedBlock = async (
   signedBlock: SignedBlock,
   prefixes: string[],
@@ -226,6 +242,19 @@ export const getBlockCallsFromSignedBlock = async (
 
         blockCalls = blockCalls.concat(batchRoot);
       }
+    } else if (hasInnerCall(extrinsic.method as TCall)) {
+      let method = api.createType("Call", getInnerCall(extrinsic.method as TCall));
+      while (hasInnerCall(method)) {
+        method = api.createType("Call", getInnerCall(method));
+      }
+
+      if (isSystemRemark(method, prefixes)) {
+        blockCalls.push({
+          call: "system.remark",
+          value: method.args.toString(),
+          caller: encodeAddress(extrinsic.signer.toString(), ss58Format),
+        });
+      }
     }
     extrinsicIndex++;
   }