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97 lines
2.8 KiB
97 lines
2.8 KiB
import {ICustomWidget} from 'app/common/CustomWidget';
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import log from 'app/server/lib/log';
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import fetch from 'node-fetch';
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import {ApiError} from 'app/common/ApiError';
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import LRUCache from 'lru-cache';
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/**
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* Widget Repository returns list of available Custom Widgets.
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*/
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export interface IWidgetRepository {
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getWidgets(): Promise<ICustomWidget[]>;
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}
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// Static url for StaticWidgetRepository
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const STATIC_URL = process.env.GRIST_WIDGET_LIST_URL;
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/**
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* Default repository that gets list of available widgets from a static URL.
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*/
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export class WidgetRepositoryImpl implements IWidgetRepository {
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constructor(protected _staticUrl = STATIC_URL) {}
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/**
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* Method exposed for testing, overrides widget url.
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*/
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public testOverrideUrl(url: string) {
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this._staticUrl = url;
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}
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public async getWidgets(): Promise<ICustomWidget[]> {
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if (!this._staticUrl) {
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log.warn(
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'WidgetRepository: Widget repository is not configured.' + !STATIC_URL
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? ' Missing GRIST_WIDGET_LIST_URL environmental variable.'
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: ''
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);
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return [];
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}
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try {
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const response = await fetch(this._staticUrl);
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if (!response.ok) {
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if (response.status === 404) {
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throw new ApiError('WidgetRepository: Remote widget list not found', 404);
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} else {
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const body = await response.text().catch(() => '');
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throw new ApiError(
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`WidgetRepository: Remote server returned an error: ${body || response.statusText}`, response.status
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);
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}
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}
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const widgets = await response.json().catch(() => null);
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if (!widgets || !Array.isArray(widgets)) {
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throw new ApiError('WidgetRepository: Error reading widget list', 500);
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}
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return widgets;
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} catch (err) {
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if (!(err instanceof ApiError)) {
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throw new ApiError(String(err), 500);
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}
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throw err;
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}
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}
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}
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/**
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* Version of WidgetRepository that caches successful result for 2 minutes.
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*/
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class CachedWidgetRepository extends WidgetRepositoryImpl {
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private _cache = new LRUCache<1, ICustomWidget[]>({maxAge : 1000 * 60 /* minute */ * 2});
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public async getWidgets() {
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// Don't cache for localhost
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if (super._staticUrl && super._staticUrl.startsWith("http://localhost")) {
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this._cache.reset();
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}
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if (this._cache.has(1)) {
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log.debug("WidgetRepository: Widget list taken from the cache.");
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return this._cache.get(1)!;
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}
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const list = await super.getWidgets();
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// Cache only if there are some widgets.
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if (list.length) { this._cache.set(1, list); }
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return list;
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}
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public testOverrideUrl(url: string) {
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super.testOverrideUrl(url);
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this._cache.reset();
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}
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}
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/**
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* Returns widget repository implementation.
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*/
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export function buildWidgetRepository() {
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return new CachedWidgetRepository();
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}
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