dashy/services/healthcheck.js

37 lines
1.3 KiB
JavaScript

/**
* An endpoint for confirming that the application is up and running
* Used for better Docker healthcheck results
* Note that exiting with code 1 indicates failure, and 0 is success
*/
const http = require('http');
/* Location of the server to test */
const port = process.env.PORT || !!process.env.IS_DOCKER ? 80 : 4000;
const host = process.env.HOST || '0.0.0.0';
const timeout = 2000;
const requestOptions = { host, port, timeout };
const startTime = new Date();
console.log(`[${startTime}] Running health check...`);
/* Starts quick HTTP server, attempts to send GET to app, then exists with appropriate exit code */
const healthCheck = http.request(requestOptions, (response) => {
const totalTime = (new Date() - startTime) / 1000;
const status = response.statusCode;
const color = status === 200 ? '\x1b[32m' : '\x1b[31m';
const message = `${color}Status: ${status}\nRequest took ${totalTime} seconds\n\x1b[0m---`;
console.log(message);
if (status == 200) { process.exit(0); }
else { process.exit(1); }
});
/* If the server is not running, then print the error code, and exit with 1 */
healthCheck.on('error', (err) => {
console.error(`\x1b[31mHealthceck Failed, Error: ${'\033[4m'}${err.code}\x1b[0m`);
process.exit(1);
});
healthCheck.end();