Call Workflow
This diagram shows the call execution flow: starting with ensure_updated, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: PreimageFor, StatusFor, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: validatorsdevelopers
The Big Picture
Migration helper.
Use Cases
- Post-upgrade maintenance
From Chain Metadata
Ensure that the a bulk of pre-images is upgraded. The caller pays no fee if at least 90% of pre-images were successfully updated.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | hashes | Vec<H256> Vec Vec<T::Hash> | hashes: list of Cryptographic hash (32 bytes) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Hash provided
Effects
Storage Modified
Postconditions
- Status migrated
Code Examples
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Build ensure_updated call (typed, named args)
const hashes = [] as [];
const tx = api.tx.Preimage.ensure_updated({
hashes,
});Runtime Info
- Pallet Index
- 14
- Call Index
- 4
- First Version
- v151
- Current Version
- v411