Jaco
5145a0c181
* Bump dev * Adjust dev/node/test/node.d.ts imports * Fix types-support imports * Adjust extensionless imports
43 lines
1.4 KiB
TypeScript
43 lines
1.4 KiB
TypeScript
// Copyright 2017-2023 @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 { HeaderExtended } from '../type/types.js';
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import type { DeriveApi } from '../types.js';
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import { combineLatest, map, switchMap } from 'rxjs';
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import { createHeaderExtended } from '../type/index.js';
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import { memo } from '../util/index.js';
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import { getAuthorDetails } from './util.js';
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/**
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* @name getHeader
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* @param {( Uint8Array | string )} hash - A block hash as U8 array or string.
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* @returns An array containing the block header and the block author
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* @description Get a specific block header and extend it with the author
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* @example
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* <BR>
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*
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* ```javascript
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* const { author, number } = await api.derive.chain.getHeader('0x123...456');
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*
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* console.log(`block #${number} was authored by ${author}`);
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* ```
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*/
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export function getHeader (instanceId: string, api: DeriveApi): (blockHash: Uint8Array | string) => Observable<HeaderExtended> {
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return memo(instanceId, (blockHash: Uint8Array | string): Observable<HeaderExtended> =>
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combineLatest([
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api.rpc.chain.getHeader(blockHash),
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api.queryAt(blockHash)
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]).pipe(
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switchMap(([header, queryAt]) =>
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getAuthorDetails(header, queryAt)
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),
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map(([header, validators, author]) =>
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createHeaderExtended((validators || header).registry, header, validators, author)
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)
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)
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);
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}
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