feat: add call method to SignedExtrinsicRune

examples/sign/offline.eg.ts

@@ -5,7 +5,7 @@
  * Finally, rehydrate the extrinsic and submit it.
  */
 
-import { westendDev } from "@capi/westend-dev"
+import { $runtimeCall, westendDev } from "@capi/westend-dev"
 import { $, createDevUsers, SignedExtrinsicRune } from "capi"
 import { signature } from "capi/patterns/signature/polkadot.ts"
 
@@ -25,7 +25,17 @@ const hex = await westendDev.Balances
 /// writing to disk, etc.).
 save(hex)
 
-/// Hydrate the signed extrinsic, submit it and await finalization.
+/// Hydrate the signed extrinsic.
+const signedExtrinsic = SignedExtrinsicRune.fromHex(westendDev, hex)
+
+/// Decode the signed extrinsic.
+const decoded = await signedExtrinsic.extrinsic().run()
+
+/// Ensure the call data is what we expect.
+console.log(decoded)
+$.assert($runtimeCall, decoded.call)
+
+/// Submit it and await finalization.
 const hash = await SignedExtrinsicRune
   .fromHex(westendDev, hex)
   .sent()

fluent/SignedExtrinsicRune.ts

@@ -1,10 +1,14 @@
 import { hex } from "../crypto/mod.ts"
+import { $extrinsic } from "../frame_metadata/mod.ts"
 import { Rune, RunicArgs, ValueRune } from "../rune/mod.ts"
 import { Chain, ChainRune } from "./ChainRune.ts"
+import { CodecRune } from "./CodecRune.ts"
 import { ExtrinsicStatusRune } from "./ExtrinsicStatusRune.ts"
 import { PatternRune } from "./PatternRune.ts"
 
 export class SignedExtrinsicRune<out C extends Chain, out U> extends PatternRune<Uint8Array, C, U> {
+  $extrinsic = Rune.fn($extrinsic).call(this.chain.metadata).into(CodecRune)
+
   static from<C extends Chain, U, X>(
     chain: ChainRune<C, U>,
     ...[value]: RunicArgs<X, [value: Uint8Array]>
@@ -19,6 +23,10 @@ export class SignedExtrinsicRune<out C extends Chain, out U> extends PatternRune
     return this.from(chain, Rune.resolve(value).map(hex.decode))
   }
 
+  extrinsic() {
+    return this.$extrinsic.decoded(this.as(SignedExtrinsicRune))
+  }
+
   hex() {
     return this.into(ValueRune).map(hex.encode)
   }