89 lines
3.1 KiB
TypeScript
89 lines
3.1 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 { ApiInterfaceRx } from '@polkadot/api/types';
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import type { u32, Vec } from '@polkadot/types';
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import type { AccountId, Balance, BlockNumber, SeatHolder } from '@polkadot/types/interfaces';
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import type { ITuple } from '@polkadot/types/types';
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import type { Observable } from '@polkadot/x-rxjs';
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import type { DeriveElectionsInfo } from './types';
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import { map } from '@polkadot/x-rxjs/operators';
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import { memo } from '../util';
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// SeatHolder is current tuple is 2.x-era Substrate
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type Member = SeatHolder | ITuple<[AccountId, Balance]>;
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type Candidate = AccountId | ITuple<[AccountId, Balance]>;
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function isSeatHolder (value: Member): value is SeatHolder {
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return !Array.isArray(value);
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}
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function isCandidateTuple (value: Candidate): value is ITuple<[AccountId, Balance]> {
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return Array.isArray(value);
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}
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function getAccountTuple (value: Member): [AccountId, Balance] {
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return isSeatHolder(value)
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? [value.who, value.stake]
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: value;
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}
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function getCandidate (value: Candidate): AccountId {
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return isCandidateTuple(value)
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? value[0]
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: value;
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}
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function sortAccounts ([, balanceA]: [AccountId, Balance], [, balanceB]: [AccountId, Balance]): number {
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return balanceB.cmp(balanceA);
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}
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function queryElections (api: ApiInterfaceRx): Observable<DeriveElectionsInfo> {
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const section = api.query.phragmenElection
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? 'phragmenElection'
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: api.query.electionsPhragmen
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? 'electionsPhragmen'
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: 'elections';
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return api.queryMulti<[Vec<AccountId>, Vec<Candidate>, Vec<Member>, Vec<Member>]>([
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api.query.council.members,
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api.query[section].candidates,
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api.query[section].members,
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api.query[section].runnersUp
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]).pipe(
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map(([councilMembers, candidates, members, runnersUp]): DeriveElectionsInfo => ({
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candidacyBond: api.consts[section].candidacyBond as Balance,
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candidateCount: api.registry.createType('u32', candidates.length),
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candidates: candidates.map(getCandidate),
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desiredRunnersUp: api.consts[section].desiredRunnersUp as u32,
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desiredSeats: api.consts[section].desiredMembers as u32,
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members: members.length
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? members.map(getAccountTuple).sort(sortAccounts)
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: councilMembers.map((accountId): [AccountId, Balance] => [accountId, api.registry.createType('Balance')]),
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runnersUp: runnersUp.map(getAccountTuple).sort(sortAccounts),
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termDuration: api.consts[section].termDuration as BlockNumber,
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votingBond: api.consts[section].votingBond as Balance
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}))
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);
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}
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/**
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* @name info
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* @returns An object containing the combined results of the storage queries for
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* all relevant election module properties.
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* @example
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* <BR>
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*
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* ```javascript
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* api.derive.elections.info(({ members, candidates }) => {
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* console.log(`There are currently ${members.length} council members and ${candidates.length} prospective council candidates.`);
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* });
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* ```
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*/
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export function info (instanceId: string, api: ApiInterfaceRx): () => Observable<DeriveElectionsInfo> {
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return memo(instanceId, (): Observable<DeriveElectionsInfo> => queryElections(api));
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}
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