masto-fe/app/javascript/mastodon/features/ui/components/bundle.js
Akihiko Odaki 7cb49eaa3a Do not use function name to track components (#6542)
UglifyJS2 is allowed to mangle function names, and function names can also
be duplicate if they are from different scopes. Therefore function names
are not reliable as identifiers.

Functions as keys for Map object is a cheaper and more reliable
alternative.
2018-02-24 19:10:57 +01:00

101 lines
2.3 KiB
JavaScript

import React from 'react';
import PropTypes from 'prop-types';
const emptyComponent = () => null;
const noop = () => { };
class Bundle extends React.Component {
static propTypes = {
fetchComponent: PropTypes.func.isRequired,
loading: PropTypes.func,
error: PropTypes.func,
children: PropTypes.func.isRequired,
renderDelay: PropTypes.number,
onFetch: PropTypes.func,
onFetchSuccess: PropTypes.func,
onFetchFail: PropTypes.func,
}
static defaultProps = {
loading: emptyComponent,
error: emptyComponent,
renderDelay: 0,
onFetch: noop,
onFetchSuccess: noop,
onFetchFail: noop,
}
static cache = new Map
state = {
mod: undefined,
forceRender: false,
}
componentWillMount() {
this.load(this.props);
}
componentWillReceiveProps(nextProps) {
if (nextProps.fetchComponent !== this.props.fetchComponent) {
this.load(nextProps);
}
}
componentWillUnmount () {
if (this.timeout) {
clearTimeout(this.timeout);
}
}
load = (props) => {
const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props;
const cachedMod = Bundle.cache.get(fetchComponent);
onFetch();
if (cachedMod) {
this.setState({ mod: cachedMod.default });
onFetchSuccess();
return Promise.resolve();
}
this.setState({ mod: undefined });
if (renderDelay !== 0) {
this.timestamp = new Date();
this.timeout = setTimeout(() => this.setState({ forceRender: true }), renderDelay);
}
return fetchComponent()
.then((mod) => {
Bundle.cache.set(fetchComponent, mod);
this.setState({ mod: mod.default });
onFetchSuccess();
})
.catch((error) => {
this.setState({ mod: null });
onFetchFail(error);
});
}
render() {
const { loading: Loading, error: Error, children, renderDelay } = this.props;
const { mod, forceRender } = this.state;
const elapsed = this.timestamp ? (new Date() - this.timestamp) : renderDelay;
if (mod === undefined) {
return (elapsed >= renderDelay || forceRender) ? <Loading /> : null;
}
if (mod === null) {
return <Error onRetry={this.load} />;
}
return children(mod);
}
}
export default Bundle;