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♻️ Refactors Docker healthcheck script

This commit is contained in:
Alicia Sykes 2021-07-12 23:27:33 +01:00
parent fd29c1248e
commit c717134b08
1 changed files with 36 additions and 37 deletions
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73
services/healthcheck.js
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@ -1,37 +1,36 @@
/** /**
* An endpoint for confirming that the application is up and running * An endpoint for confirming that the application is up and running
* Used for better Docker healthcheck results * Used for better Docker healthcheck results
* Note that exiting with code 1 indicates failure, and 0 is success * Note that exiting with code 1 indicates failure, and 0 is success
*/ */
const http = require('http'); const http = require('http');
/* Location of the server to test */ /* Location of the server to test */
const port = process.env.PORT || !!process.env.IS_DOCKER ? 80 : 4000; const port = process.env.PORT || !!process.env.IS_DOCKER ? 80 : 4000;
const host = process.env.HOST || '0.0.0.0'; const host = process.env.HOST || '0.0.0.0';
const timeout = 2000; const timeout = 2000;
const requestOptions = { host, port, timeout }; const requestOptions = { host, port, timeout };
const startTime = new Date(); const startTime = new Date(); // Initialize timestamp to calculate time taken
console.log(`[${startTime}] Running health check...`); console.log(`[${startTime}] Running health check...`);
/* Starts quick HTTP server, attempts to send GET to app, then exists with appropriate exit code */ /* Starts quick HTTP server, attempts to send GET to app, then exists with appropriate exit code */
const healthCheck = http.request(requestOptions, (response) => { const healthCheck = http.request(requestOptions, (response) => {
const totalTime = (new Date() - startTime) / 1000; const totalTime = (new Date() - startTime) / 1000;
const status = response.statusCode; const status = response.statusCode;
const color = status === 200 ? '\x1b[32m' : '\x1b[31m'; const color = status === 200 ? '\x1b[32m' : '\x1b[31m';
const message = `${color}Status: ${status}\nRequest took ${totalTime} seconds\n\x1b[0m---`; const message = `${color}Status: ${status}\nRequest took ${totalTime} seconds\n\x1b[0m---`;
console.log(message); console.log(message); // Print out healthcheck response
if (status == 200) { process.exit(0); } process.exit(status === 200 ? 0 : 1); // Exit with 0 (success), if response is 200 okay
else { process.exit(1); } });
});
/* If the server is not running, then print the error code, and exit with 1 */
/* If the server is not running, then print the error code, and exit with 1 */ healthCheck.on('error', (err) => {
healthCheck.on('error', (err) => { console.error(`\x1b[31mHealthceck Failed, Error: ${'\x1b[33m'}${err.code}\x1b[0m`);
console.error(`\x1b[31mHealthceck Failed, Error: ${'\033[4m'}${err.code}\x1b[0m`); process.exit(1);
process.exit(1); });
});
healthCheck.end();
healthCheck.end();