014ae780e4
* Split ui-api, update API version * Update (awaiting API changes to go through) * Cleanup ui-api exports * Bump API (SubscriptionPromise support) * Linting fixes * Update renames * Do display balances.Transfer (shows for non-owned accounts) * Bump API
31 lines
1.1 KiB
TypeScript
31 lines
1.1 KiB
TypeScript
// Copyright 2017-2019 @polkadot/ui-api authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import { PromiseSubscription } from '@polkadot/api/promise/types';
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import { DeriveSubscription } from '../types';
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import BN from 'bn.js';
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import ApiPromise from '@polkadot/api/promise';
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import sessionProgress from './sessionProgress';
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export default function eraProgress (api: ApiPromise): DeriveSubscription {
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return (cb: (count: BN) => any): PromiseSubscription =>
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api.combineLatest([
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sessionProgress(api),
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api.query.session.currentIndex,
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api.query.session.sessionLength,
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api.query.staking.lastEraLengthChange,
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api.query.staking.sessionsPerEra
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], ([sessionProgress, currentIndex, sessionLength, lastEraLengthChange, sessionsPerEra]) =>
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cb(
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(currentIndex || new BN(0))
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.sub(lastEraLengthChange || new BN(0))
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.mod(sessionsPerEra || new BN(1))
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.mul(sessionLength || new BN(1))
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.add(sessionProgress || new BN(0))
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)
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);
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}
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