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Viewing file:     FailoverDetector.js (1.68 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.FailoverDetector = void 0;
const utils_1 = require("../../utils");
const debug = (0, utils_1.Debug)("FailoverDetector");
const CHANNEL_NAME = "+switch-master";
class FailoverDetector {
    // sentinels can't be used for regular commands after this
    constructor(connector, sentinels) {
        this.isDisconnected = false;
        this.connector = connector;
        this.sentinels = sentinels;
    }
    cleanup() {
        this.isDisconnected = true;
        for (const sentinel of this.sentinels) {
            sentinel.client.disconnect();
        }
    }
    async subscribe() {
        debug("Starting FailoverDetector");
        const promises = [];
        for (const sentinel of this.sentinels) {
            const promise = sentinel.client.subscribe(CHANNEL_NAME).catch((err) => {
                debug("Failed to subscribe to failover messages on sentinel %s:%s (%s)", sentinel.address.host || "127.0.0.1", sentinel.address.port || 26739, err.message);
            });
            promises.push(promise);
            sentinel.client.on("message", (channel) => {
                if (!this.isDisconnected && channel === CHANNEL_NAME) {
                    this.disconnect();
                }
            });
        }
        await Promise.all(promises);
    }
    disconnect() {
        // Avoid disconnecting more than once per failover.
        // A new FailoverDetector will be created after reconnecting.
        this.isDisconnected = true;
        debug("Failover detected, disconnecting");
        // Will call this.cleanup()
        this.connector.disconnect();
    }
}
exports.FailoverDetector = FailoverDetector;