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/*
* SonarQube
* Copyright (C) 2009-2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
import * as React from 'react';
import { translate } from '../helpers/l10n';
import { get, save } from '../helpers/storage';
type ReactComponent<P> = React.ComponentClass<P> | React.StatelessComponent<P>;
interface Loader<P> {
(): Promise<{ default: ReactComponent<P> }>;
}
export const LAST_FAILED_CHUNK_STORAGE_KEY = 'sonarqube.last_failed_chunk';
export function lazyLoad<P>(loader: Loader<P>) {
interface ImportError {
request?: string;
}
interface State {
Component?: ReactComponent<P>;
error?: ImportError;
}
// use `React.Component`, not `React.PureComponent` to always re-render
// and let the child component decide if it needs to change
return class LazyLoader extends React.Component<any, State> {
mounted = false;
state: State = {};
componentDidMount() {
this.mounted = true;
loader().then(i => this.receiveComponent(i.default), this.failToReceiveComponent);
}
componentWillUnmount() {
this.mounted = false;
}
receiveComponent = (Component: ReactComponent<P>) => {
if (this.mounted) {
this.setState({ Component, error: undefined });
}
};
failToReceiveComponent = (error?: ImportError) => {
const lastFailedChunk = get(LAST_FAILED_CHUNK_STORAGE_KEY);
if (error && error.request === lastFailedChunk) {
// BOOM!
// this is the second time we try to load the same file
// usually that means the file does not exist on the server
// so we should not try to reload the page to not fall into infinite reloading
// just show the error message
if (this.mounted) {
this.setState({ Component: undefined, error });
}
} else {
if (error && error.request) {
save(LAST_FAILED_CHUNK_STORAGE_KEY, error.request);
}
window.location.reload();
}
};
render() {
const { Component, error } = this.state;
if (error && error.request) {
return <div className="alert alert-danger">{translate('default_error_message')}</div>;
}
if (!Component) {
return null;
}
return <Component {...this.props} />;
}
};
}
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