Jaco
ff3882f5f7
* Bump common (w/ rxjs 7) * Adjust * pre bump * Cleanup imports * Add missing switchMap * CHANGELOG * Remove duplicate imports * Bump common * Direct rxjs import
33 lines
1.1 KiB
TypeScript
33 lines
1.1 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 { DeriveSessionInfo } from '../types';
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import { map } from 'rxjs';
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import { memo } from '../util';
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/**
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* @description Retrieves all the session and era query and calculates specific values on it as the length of the session and eras
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*/
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export function info (instanceId: string, api: ApiInterfaceRx): () => Observable<DeriveSessionInfo> {
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return memo(instanceId, (): Observable<DeriveSessionInfo> =>
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api.derive.session.indexes().pipe(
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map((indexes) => {
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const sessionLength = api.consts?.babe?.epochDuration || api.registry.createType('u64', 1);
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const sessionsPerEra = api.consts?.staking?.sessionsPerEra || api.registry.createType('SessionIndex', 1);
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return {
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...indexes,
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eraLength: api.registry.createType('BlockNumber', sessionsPerEra.mul(sessionLength)),
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isEpoch: !!api.query.babe,
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sessionLength,
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sessionsPerEra
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};
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})
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)
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);
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}
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