packages/api-derive/src/chain/getBlockByNumber.ts
// Copyright 2017-2024 @polkadot/api-derive authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Observable } from 'rxjs';
import type { AnyNumber } from '@polkadot/types/types';
import type { SignedBlockExtended } from '../type/types.js';
import type { DeriveApi } from '../types.js';
import { switchMap } from 'rxjs';
import { memo } from '../util/index.js';
export function getBlockByNumber (instanceId: string, api: DeriveApi): (blockNumber: AnyNumber) => Observable<SignedBlockExtended> {
return memo(instanceId, (blockNumber: AnyNumber): Observable<SignedBlockExtended> =>
api.rpc.chain.getBlockHash(blockNumber).pipe(
switchMap((h) => api.derive.chain.getBlock(h))
)
);
}