Jaco
affa6ab1bd
* Use api.at internally for sizeAt/entriesAt/keysAt * Remove debug logs * Mark api.query.<section>.<method>.at as deprecated * formatting * @deprecated formatting * commenting
49 lines
1.8 KiB
TypeScript
49 lines
1.8 KiB
TypeScript
// Copyright 2017-2021 @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 { ApiInterfaceRx } from '@polkadot/api/types';
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import type { SignedBlockExtended } from '../type/types';
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import { catchError, combineLatest, map, of, switchMap } from 'rxjs';
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import { createSignedBlockExtended } from '../type';
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import { memo } from '../util';
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/**
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* @name getBlock
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* @param {( Uint8Array | string )} hash - A block hash as U8 array or string.
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* @description Get a specific block (e.g. rpc.chain.getBlock) 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, block } = await api.derive.chain.getBlock('0x123...456');
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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 getBlock (instanceId: string, api: ApiInterfaceRx): (hash: Uint8Array | string) => Observable<SignedBlockExtended | undefined> {
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return memo(instanceId, (blockHash: Uint8Array | string): Observable<SignedBlockExtended | undefined> =>
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api.queryAt(blockHash).pipe(
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switchMap((queryAt) =>
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combineLatest([
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api.rpc.chain.getBlock(blockHash),
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queryAt.system.events(),
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queryAt.session
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? queryAt.session.validators()
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: of([])
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])
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),
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map(([signedBlock, events, validators]) =>
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createSignedBlockExtended(api.registry, signedBlock, events, validators)
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),
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catchError((): Observable<undefined> =>
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// where rpc.chain.getHeader throws, we will land here - it can happen that
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// we supplied an invalid hash. (Due to defaults, storage will have an
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// empty value, so only the RPC is affected). So return undefined
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of()
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)
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));
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}
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