openethereum/js/packages/ui/StatusIndicator/store.js

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
import { action, computed, observable } from 'mobx';
const STATUS_OK = 'ok';
const STATUS_WARN = 'needsAttention';
const STATUS_BAD = 'bad';
const EMPTY_OVERALL = { message: [], status: STATUS_BAD };
export default class Store {
@observable _health = null;
constructor (api) {
this._api = api;
setInterval(this.fetchHealth, 2500);
}
@computed get health () {
return this._health
? this._health
: {};
}
@computed get overall () {
return this._health
? this._health.overall
: EMPTY_OVERALL;
}
fetchHealth = () => {
// Support Parity-Extension.
const uiUrl = this._api.transport.uiUrlWithProtocol || '';
return fetch(`${uiUrl}/api/health`)
.then((response) => {
if (!response.ok) {
return null;
}
return response.json();
})
.catch(() => {
return null;
})
.then(this.setHealth);
}
_overallStatus = (health) => {
const all = [health.peers, health.sync, health.time].filter(x => x);
const statuses = all.map(x => x.status);
const bad = statuses.find(x => x === STATUS_BAD);
const needsAttention = statuses.find(x => x === STATUS_WARN);
const message = all.map(x => x.message).filter(x => x);
if (all.length) {
return {
status: bad || needsAttention || STATUS_OK,
message
};
}
return {
status: STATUS_BAD,
message: ['Unable to fetch node health.']
};
}
@action setHealth = (health) => {
if (!health) {
this._health = null;
return;
}
health.peers = health.peers || {};
health.sync = health.sync || {};
health.time = health.time || {};
health.overall = this._overallStatus(health);
this._health = health;
}
static instance = null;
static get (api) {
if (!Store.instance) {
Store.instance = new Store(api);
}
return Store.instance;
}
}