nats
Version:
Node.js client for NATS, a lightweight, high-performance cloud native messaging system
105 lines • 3.29 kB
JavaScript
"use strict";
/*
* Copyright 2022 The NATS Authors
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.IdleHeartbeatMonitor = void 0;
class IdleHeartbeatMonitor {
/**
* Constructor
* @param interval in millis to check
* @param cb a callback to report when heartbeats are missed
* @param opts monitor options @see IdleHeartbeatOptions
*/
constructor(interval, cb, opts = { maxOut: 2 }) {
this.interval = interval;
this.maxOut = (opts === null || opts === void 0 ? void 0 : opts.maxOut) || 2;
this.cancelAfter = (opts === null || opts === void 0 ? void 0 : opts.cancelAfter) || 0;
this.last = Date.now();
this.missed = 0;
this.count = 0;
this.callback = cb;
this._schedule();
}
/**
* cancel monitoring
*/
cancel() {
if (this.autoCancelTimer) {
clearTimeout(this.autoCancelTimer);
}
if (this.timer) {
clearInterval(this.timer);
}
this.timer = 0;
this.autoCancelTimer = 0;
this.missed = 0;
}
/**
* work signals that there was work performed
*/
work() {
this.last = Date.now();
this.missed = 0;
}
/**
* internal api to change the interval, cancelAfter and maxOut
* @param interval
* @param cancelAfter
* @param maxOut
*/
_change(interval, cancelAfter = 0, maxOut = 2) {
this.interval = interval;
this.maxOut = maxOut;
this.cancelAfter = cancelAfter;
this.restart();
}
/**
* cancels and restarts the monitoring
*/
restart() {
this.cancel();
this._schedule();
}
/**
* internal api called to start monitoring
*/
_schedule() {
if (this.cancelAfter > 0) {
// @ts-ignore: in node is not a number - we treat this opaquely
this.autoCancelTimer = setTimeout(() => {
this.cancel();
}, this.cancelAfter);
}
// @ts-ignore: in node is not a number - we treat this opaquely
this.timer = setInterval(() => {
this.count++;
if ((Date.now() - this.last) > this.interval) {
this.missed++;
}
if (this.missed >= this.maxOut) {
try {
if (this.callback(this.missed) === true) {
this.cancel();
}
}
catch (err) {
console.log(err);
}
}
}, this.interval);
}
}
exports.IdleHeartbeatMonitor = IdleHeartbeatMonitor;
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