80 lines
2.1 KiB
JavaScript
80 lines
2.1 KiB
JavaScript
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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import Eth from './eth';
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import Parity from './parity';
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import Signer from './signer';
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import Net from './net';
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import { isFunction } from '../util/types';
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export default class Pubsub {
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constructor (transport) {
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if (!transport || !isFunction(transport.subscribe)) {
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throw new Error('Pubsub API needs transport with subscribe() function defined. (WebSocket)');
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}
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this._eth = new Eth(transport);
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this._net = new Net(transport);
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this._parity = new Parity(transport);
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this._signer = new Signer(transport);
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}
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get net () {
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return this._net;
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}
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get eth () {
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return this._eth;
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}
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get parity () {
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return this._parity;
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}
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get signer () {
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return this._signer;
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}
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unsubscribe (subscriptionIds) {
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// subscriptions are namespace independent. Thus we can simply removeListener from any.
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return this._parity.removeListener(subscriptionIds);
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}
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subscribeAndGetResult (f, callback) {
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return new Promise((resolve, reject) => {
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let isFirst = true;
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let onSubscription = (error, data) => {
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const p1 = error ? Promise.reject(error) : Promise.resolve(data);
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const p2 = p1.then(callback);
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if (isFirst) {
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isFirst = false;
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p2
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.then(resolve)
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.catch(reject);
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}
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};
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try {
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f.call(this, onSubscription).catch(reject);
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} catch (err) {
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reject(err);
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}
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});
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}
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}
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