feat(rpc): extract _pending* maps to Pending util

rpc/src/core/wrapper.ts

@@ -1,5 +1,6 @@
 import { Emitter } from '../utils/emitter'
 import { parse } from '../utils/funcs'
+import { Pending } from '../utils/pending'
 import {
 	type RPCConfig,
 	type RPCEnvironment,
@@ -11,16 +12,28 @@ import {
 export class Wrapper {
 	protected env: RPCEnvironment
 	protected _emitterLocal: Emitter
+	protected _pending: Pending
 	protected debug: boolean
 	protected console: Console
 
 	constructor(cfg: RPCConfig<RPCEnvironment>) {
 		this.env = cfg.env
 		this._emitterLocal = new Emitter()
+		this._pending = new Pending(cfg.timeout ?? 5000)
 		this.debug = cfg.debug ?? false
 		this.console = console
 	}
 
+	/** Settles the call waiting for this response; ignores late or unexpected ones */
+	protected resolvePending(payload: RPCState): void {
+		const found = this._pending.resolve(payload.uuid, payload.data?.[0])
+		if (!found && this.debug) {
+			this.console.log(
+				`[RPC]:ignored response ${payload.event} ${payload.uuid} (no pending call, possibly timed out)`,
+			)
+		}
+	}
+
 	protected verifyEvent(state: Emitter, data: RPCStateRaw | RPCState) {
 		const rpcData = typeof data === 'string' ? parse(data) : data