iovalkey
Version:
A robust, performance-focused and full-featured Valkey/Redis client for Node.js.
46 lines (45 loc) • 1.72 kB
JavaScript
;
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;