Expose callIndex on extrinsics (lookups) (#206)

* Expose callId on extrinsics (lookups)

* Expose call meta

* s/callId/callIndex/

packages/type-extrinsics/src/types.d.ts

@@ -7,6 +7,7 @@ import { FunctionMetadata } from '@polkadot/types/Metadata';
 
 export interface ExtrinsicFunction {
   (...args: any[]): UncheckedMortalExtrinsic,
+  callIndex: Uint8Array,
   meta: FunctionMetadata,
   method: string;
   section: string;

packages/type-extrinsics/src/utils/createUnchecked.ts

@@ -19,6 +19,7 @@ export default function createDescriptor (
   index: number,
   meta: FunctionMetadata
 ): ExtrinsicFunction {
+  const callIndex = new Uint8Array([index, meta.id.toNumber()]);
   let extrinsicFn: any;
 
   // If the extrinsic function has an argument of type `Origin`, we ignore it
@@ -32,15 +33,12 @@ export default function createDescriptor (
       throw new Error(`Extrinsic ${section}.${method} expects ${expectedArgs.length.valueOf()} arguments, got ${args.length}.`);
     }
 
-    const call = new Call(
-      new Uint8Array([index, meta.id.toNumber()]),
-      meta,
-      args
-    );
+    const call = new Call(callIndex, meta, args);
 
     return new UncheckedMortalExtrinsic(call);
   };
 
+  extrinsicFn.callIndex = callIndex;
   extrinsicFn.meta = meta;
   extrinsicFn.method = method;
   extrinsicFn.section = section;

packages/types/src/CallIndex.ts

@@ -11,11 +11,15 @@ export default class CallIndex extends U8aFixed {
     super(value, 16);
   }
 
+  get callIndex (): Uint8Array {
+    return this.raw;
+  }
+
   get methodIndex (): number {
-    return this.raw[1];
+    return this.callIndex[1];
   }
 
   get sectionIndex (): number {
-    return this.raw[0];
+    return this.callIndex[0];
   }
 }

packages/types/src/UncheckedMortalExtrinsic.ts

@@ -10,6 +10,7 @@ import u8aConcat from '@polkadot/util/u8a/concat';
 import Address from './Address';
 import Call from './Call';
 import Extrinsic from './Extrinsic';
+import { FunctionMetadata } from './Metadata';
 import SignaturePayload from './SignaturePayload';
 import TransactionSignature from './TransactionSignature';
 
@@ -55,6 +56,22 @@ export default class UncheckedMortalExtrinsic extends Extrinsic {
     return this._signature;
   }
 
+  get meta (): FunctionMetadata {
+    return this._call.meta;
+  }
+
+  get callIndex (): Uint8Array {
+    return this._call.callIndex;
+  }
+
+  get methodIndex (): number {
+    return this._call.methodIndex;
+  }
+
+  get sectionIndex (): number {
+    return this._call.sectionIndex;
+  }
+
   sign (signerPair: KeyringPair, nonce: AnyNumber, blockHash: AnyU8a): UncheckedMortalExtrinsic {
     const signature = this.createSignature(this._call, signerPair, nonce, blockHash);