nats.ts•1.82 kB
/**
* Copyright (C) 2025 by Fonoster Inc (https://fonoster.com)
* http://github.com/fonoster/fonoster
*
* This file is part of Fonoster
*
* Licensed under the MIT License (the "License");
* you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://opensource.org/licenses/MIT
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { getLogger } from "@fonoster/logger";
import { connect } from "nats";
import { NatsEventCallback } from "./types";
const logger = getLogger({ service: "apiserver", filePath: __filename });
const ROUTR_CALL_SUBJECT = "routr.call.*";
async function streamEvents(subscription, callback: NatsEventCallback) {
// eslint-disable-next-line no-loops/no-loops
for await (const m of subscription) {
const messageStr = m.data.toString();
callback({ ...JSON.parse(messageStr) });
}
}
/**
* This method listens for registration events from Routr.
*
* @param {string} natsUrl - The NATS server URL
* @param {RegisterEventCallback} callback - The callback function
* @return {void}
*/
function watchNats(natsUrl: string, callback: NatsEventCallback) {
(async () => {
const nc = await connect({ servers: natsUrl, maxReconnectAttempts: -1 });
const a = nc.subscribe(ROUTR_CALL_SUBJECT);
logger.verbose("connected to nats", { natsUrl });
logger.verbose("subscribed to subjects", {
subjects: [ROUTR_CALL_SUBJECT]
});
await Promise.all([streamEvents(a, callback)]);
})();
}
export { watchNats };