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
31 lines
1.1 KiB
TypeScript
31 lines
1.1 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 { AnyNumber } from '@polkadot/types/types';
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import type { SignedBlockExtended } from '../type/types.js';
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import type { DeriveApi } from '../types.js';
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import { switchMap } from 'rxjs';
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import { memo } from '../util/index.js';
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/**
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* @name getBlockByNumber
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* @param {( BN | bigint | Uint8Array | number | string )} blockNumber
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* @description Get a specific block (e.g. rpc.chain.getBlock) and extend it with the author by block number
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* @example
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* ```javascript
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* const { author, block } = await api.derive.chain.getBlockByNumber(123);
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*
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* console.log(`block #${block.header.number} was authored by ${author}`);
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* ```
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*/
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export function getBlockByNumber (instanceId: string, api: DeriveApi): (blockNumber: AnyNumber) => Observable<SignedBlockExtended> {
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return memo(instanceId, (blockNumber: AnyNumber): Observable<SignedBlockExtended> =>
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api.rpc.chain.getBlockHash(blockNumber).pipe(
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switchMap((h) => api.derive.chain.getBlock(h))
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)
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);
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}
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