Jaco
500e2022c3
* Augment Registry (w/o CodecRegistry & CreateRegistry) * Build fixes * Final build fixes * licence headers
40 lines
1.2 KiB
TypeScript
40 lines
1.2 KiB
TypeScript
// Copyright 2017-2022 @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 { SignedBlockExtended } from '../type/types';
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import type { DeriveApi } from '../types';
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import { 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 subscribeNewBlocks
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* @returns The latest block & events for that block
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*/
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export function subscribeNewBlocks (instanceId: string, api: DeriveApi): () => Observable<SignedBlockExtended> {
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return memo(instanceId, (): Observable<SignedBlockExtended> =>
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api.derive.chain.subscribeNewHeads().pipe(
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switchMap((header) => {
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const blockHash = header.createdAtHash || header.hash;
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// we get the block first, setting up the registry
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return combineLatest([
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of(header),
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api.rpc.chain.getBlock(blockHash),
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api.queryAt(blockHash).pipe(
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switchMap((queryAt) =>
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queryAt.system.events()
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)
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)
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]);
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}),
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map(([header, block, events]) =>
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createSignedBlockExtended(block.registry, block, events, header.validators)
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)
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)
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);
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}
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