28 lines
1.1 KiB
TypeScript
28 lines
1.1 KiB
TypeScript
// Copyright 2017-2020 @polkadot/api-derive authors & contributors
|
|
// This software may be modified and distributed under the terms
|
|
// of the Apache-2.0 license. See the LICENSE file for details.
|
|
|
|
import { AccountId, Balance, BlockNumber, Hash } from '@polkadot/types/interfaces';
|
|
import { ITuple } from '@polkadot/types/types';
|
|
import { ApiInterfaceRx } from '@polkadot/api/types';
|
|
import { DeriveProposalImage } from '../types';
|
|
|
|
import { Observable } from 'rxjs';
|
|
import { map } from 'rxjs/operators';
|
|
import { Bytes, Option } from '@polkadot/types';
|
|
|
|
import { memo } from '../util';
|
|
import { parseImage } from './util';
|
|
|
|
type PreImage = Option<ITuple<[Bytes, AccountId, Balance, BlockNumber]>>;
|
|
|
|
export function preimages (api: ApiInterfaceRx): (hashes: Hash[]) => Observable<(DeriveProposalImage | undefined)[]> {
|
|
return memo((hashes: Hash[]): Observable<(DeriveProposalImage | undefined)[]> =>
|
|
api.query.democracy.preimages.multi<PreImage>(hashes).pipe(
|
|
map((images): (DeriveProposalImage | undefined)[] =>
|
|
images.map((imageOpt) => parseImage(api, imageOpt))
|
|
)
|
|
)
|
|
);
|
|
}
|