58 lines
2.6 KiB
TypeScript
58 lines
2.6 KiB
TypeScript
// Copyright 2017-2024 @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 { AccountId } from '@polkadot/types/interfaces';
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import type { DeriveApi, DeriveStakingValidators } from '../types.js';
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import { combineLatest, map, of, switchMap } from 'rxjs';
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import { memo } from '../util/index.js';
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export function nextElected (instanceId: string, api: DeriveApi): () => Observable<AccountId[]> {
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return memo(instanceId, (): Observable<AccountId[]> =>
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// Compatibility for future generation changes in staking.
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api.query.staking.erasStakersOverview
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? api.derive.session.indexes().pipe(
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// only populate for next era in the last session, so track both here - entries are not
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// subscriptions, so we need a trigger - currentIndex acts as that trigger to refresh
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switchMap(({ currentEra }) => api.query.staking.erasStakersOverview.keys(currentEra)),
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// Dedupe any duplicates
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map((keys) => [...new Set(keys.map(({ args: [, accountId] }) => accountId.toString()))].map((a) => api.registry.createType('AccountId', a)))
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)
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: api.query.staking.erasStakers
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? api.derive.session.indexes().pipe(
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// only populate for next era in the last session, so track both here - entries are not
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// subscriptions, so we need a trigger - currentIndex acts as that trigger to refresh
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switchMap(({ currentEra }) => api.query.staking.erasStakers.keys(currentEra)),
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// Dedupe any duplicates
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map((keys) => [...new Set(keys.map(({ args: [, accountId] }) => accountId.toString()))].map((a) => api.registry.createType('AccountId', a)))
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)
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: api.query.staking['currentElected']<AccountId[]>()
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);
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}
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/**
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* @description Retrieve latest list of validators
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*/
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export function validators (instanceId: string, api: DeriveApi): () => Observable<DeriveStakingValidators> {
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return memo(instanceId, (): Observable<DeriveStakingValidators> =>
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// Sadly the node-template is (for some obscure reason) not comprehensive, so while the derive works
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// in all actual real-world deployed chains, it does create some confusion for limited template chains
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combineLatest([
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api.query.session
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? api.query.session.validators()
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: of([]),
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api.query.staking
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? api.derive.staking.nextElected()
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: of([])
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]).pipe(
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map(([validators, nextElected]): DeriveStakingValidators => ({
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nextElected: nextElected.length
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? nextElected
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: validators,
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validators
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}))
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));
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}
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