/** * Copyright (c) HashiCorp, Inc. * SPDX-License-Identifier: MPL-2.0 */ export default function (source, DefaultEventSource, P = Promise) { return function (sources) { return function (cb, configuration) { const key = configuration.key; if (typeof sources[key] !== 'undefined' && configuration.settings.enabled) { if (typeof sources[key].configuration === 'undefined') { sources[key].configuration = {}; } sources[key].configuration.settings = configuration.settings; return source(sources[key]); } else { const EventSource = configuration.type || DefaultEventSource; const eventSource = (sources[key] = new EventSource(cb, configuration)); return source(eventSource) .catch(function (e) { // any errors, delete from the cache for next time delete sources[key]; return P.reject(e); }) .then(function (eventSource) { // make sure we cancel everything out if there is no cursor if (typeof eventSource.configuration.cursor === 'undefined') { eventSource.close(); delete sources[key]; } return eventSource; }); } }; }; }