Valentin Fernandez
ed62d164ea
* document derives from accounts to democracy * Derive Documentation progress * Derive Documentation progress * tx and staking docs * Staking docs progress * more staking docs * Staking module complete * imonline, elections and progress in democracy * Document missing derives * lint
58 lines
1.8 KiB
TypeScript
58 lines
1.8 KiB
TypeScript
// Copyright 2017-2025 @polkadot/api-derive authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { Observable } from 'rxjs';
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import type { Option, u32 } from '@polkadot/types';
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import type { PolkadotRuntimeCommonCrowdloanFundInfo } from '@polkadot/types/lookup';
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import type { BN } from '@polkadot/util';
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import type { DeriveApi } from '../types.js';
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import { map } from 'rxjs';
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import { u8aConcat, u8aToHex } from '@polkadot/util';
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import { blake2AsU8a } from '@polkadot/util-crypto';
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import { memo } from '../util/index.js';
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interface AllInfo extends PolkadotRuntimeCommonCrowdloanFundInfo {
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// previously it was named trieIndex
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trieIndex?: u32;
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}
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function createChildKey (info: AllInfo): string {
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return u8aToHex(
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u8aConcat(
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':child_storage:default:',
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blake2AsU8a(
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u8aConcat(
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'crowdloan',
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(info.fundIndex || info.trieIndex).toU8a()
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)
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)
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)
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);
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}
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/**
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* @name childKey
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* @description Retrieves the child storage key for a given parachain’s crowdloan contributions.
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* This key is used to access contribution data stored in a separate child trie of the blockchain’s state.
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* @param {string | number | BN} paraId The parachain ID for which contributions are being queried.
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* @example
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* ```javascript
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* const childKey = await api.derive.crowdloan.childKey(3369);
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* console.log("Child Key:", childKey);
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* ```
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*/
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export function childKey (instanceId: string, api: DeriveApi): (paraId: string | number | BN) => Observable<string | null> {
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return memo(instanceId, (paraId: string | number | BN): Observable<string | null> =>
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api.query['crowdloan']['funds']<Option<PolkadotRuntimeCommonCrowdloanFundInfo>>(paraId).pipe(
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map((optInfo) =>
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optInfo.isSome
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? createChildKey(optInfo.unwrap())
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: null
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)
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)
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);
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}
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