CallUnavailable

Event Re-added v133 → v150, v151 → current #5

Emitted when a scheduled call could not be found and the task is aborted.

View events on chain

Useful for: developersanalytics

The Big Picture

Error condition - the scheduled call data was missing.

Use Cases

Debug failed scheduled tasks
Monitor scheduling errors

From Chain Metadata

The call for the provided hash was not found so the task has been aborted.

Triggers

Preconditions

Execution attempted
Call data unavailable

Effects

Postconditions

Task aborted
Will not execute

Side Effects

Task removed from agenda

Event Data

#	Name	Type	Description
0	task	(u32, u32)	Task address as (block_number, index) tuple
1	id	Option	Optional 32-byte task name (None for anonymous tasks)

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Subscribe to CallUnavailable events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("Scheduler") &&
      event.method === "CallUnavailable"
    )
    .forEach(({ event }) => {
      console.log("CallUnavailable:", event.data.toHuman());
    });
});

Version History

Version:

v133 block 1,404,224 2 args

v151 block 3,157,274 2 args Current

Runtime Info

Pallet Index: 15
Event Index: 5
First Version: v133
Current Version: v393

Back to Scheduler Events