@linkedmink/node-route53-dynamic-dns/dist/event-handlers/health-check-server.mjs

Background process that updates AWS Route 53 DNS address records whenever the public IP of the hosting environment changes

import http from "node:http";
import { loggerForModuleUrl } from "../environment/logger.mjs";
export class HealthCheckServer {
    logger = loggerForModuleUrl(import.meta.url);
    startDateTime = new Date();
    publicIpAddresses = null;
    lastPublicIpDateTime = null;
    lastUpdateDateTime = null;
    dnsRecords = null;
    start = async (port, hostname) => {
        this.startDateTime = new Date();
        this.logger.verbose(`Health check server starting: port=${port}, host=${hostname}`);
        const server = http.createServer(this.handleHttpRequest);
        await new Promise((resolve, _reject) => {
            server.listen(port, hostname, resolve);
        });
        this.logger.info(`Health check server listening: ${port}, host=${hostname}`);
        return server;
    };
    handleRecordsRetrievedEvent = (event) => {
        this.dnsRecords = event.dnsRecords;
    };
    handleRecordsUpdatedEvent = (event) => {
        this.dnsRecords = event.dnsRecords;
        this.lastUpdateDateTime = event.lastChangeDateTime;
    };
    handlePublicIpEvent = (event) => {
        this.publicIpAddresses = event.publicIpAddresses;
        this.lastPublicIpDateTime = event.lastPublicIpDateTime;
    };
    handleHttpRequest = (req, res) => {
        this.logger.http(`Handling health check from: ${req.socket.remoteAddress}`);
        const responseData = {
            publicIpAddresses: this.publicIpAddresses,
            lastUpdateDateTime: this.lastUpdateDateTime?.toISOString() || null,
            lastPublicIpDateTime: this.lastPublicIpDateTime?.toISOString() || null,
            dnsRecords: this.dnsRecords,
            uptimeMs: Date.now() - this.startDateTime.getTime(),
        };
        res.end(JSON.stringify(responseData));
    };
}
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