Wrote server functions for checking uptime

This commit is contained in:
Alicia Sykes 2021-06-14 20:42:02 +01:00
parent 6a59c24e39
commit 1a64b54046
2 changed files with 78 additions and 2 deletions

View File

@ -9,6 +9,8 @@ const os = require('os');
require('./src/utils/ConfigValidator'); require('./src/utils/ConfigValidator');
const pingUrl = require('./services/ping');
const isDocker = !!process.env.IS_DOCKER; const isDocker = !!process.env.IS_DOCKER;
/* Checks env var for port. If undefined, will use Port 80 for Docker, or 4000 for metal */ /* Checks env var for port. If undefined, will use Port 80 for Docker, or 4000 for metal */
@ -64,8 +66,16 @@ const printWelcomeMessage = () => {
try { try {
connect() connect()
.use(serveStatic(`${__dirname}/dist`)) .use(serveStatic(`${__dirname}/dist`)) /* Serves up the main built application to the root */
.use(serveStatic(`${__dirname}/public`, { index: 'default.html' })) .use(serveStatic(`${__dirname}/public`, { index: 'default.html' })) /* During build, a custom page will be served */
.use('/ping', (req, res) => { /* This root returns the status of a given service - used for uptime monitoring */
try {
pingUrl(req.url, async (results) => {
await res.end(results);
});
// next();
} catch (e) { console.warn(`Error running ping check for ${req.url}\n`, e); }
})
.listen(port, () => { .listen(port, () => {
try { printWelcomeMessage(); } catch (e) { console.log('Dashy is Starting...'); } try { printWelcomeMessage(); } catch (e) { console.log('Dashy is Starting...'); }
}); });

66
services/ping.js Normal file
View File

@ -0,0 +1,66 @@
/**
* This file contains the Node.js code, used for the optional status check feature
* It accepts a single url parameter, and will make an empty GET request to that
* endpoint, and then resolve the response status code, time taken, and short message
*/
const axios = require('axios').default;
/* Determines if successful from the HTTP response code */
const getResponseType = (code) => {
if (Number.isNaN(code)) return false;
const numericCode = parseInt(code, 10);
return (numericCode >= 200 && numericCode <= 302);
};
/* Makes human-readable response text for successful check */
const makeMessageText = (data) => `${data.successStatus ? '✅' : '⚠️'} `
+ `${data.serverName || 'Server'} responded with `
+ `${data.statusCode} - ${data.statusText}. `
+ `\nTook ${data.timeTaken} ms`;
/* Makes human-readable response text for failed check */
const makeErrorMessage = (data) => `❌ Service Unavailable: ${data.hostname || 'Server'} `
+ `resulted in ${data.code || 'a fatal error'} ${data.errno ? `(${data.errno})` : ''}`;
const makeErrorMessage2 = (data) => `❌ Service Error - `
+ `${data.status} - ${data.statusText}`;
/* Kicks of a HTTP request, then formats and renders results */
const makeRequest = (url, render) => {
const startTime = new Date();
axios.get(url)
.then((response) => {
const statusCode = response.status;
const { statusText } = response;
const successStatus = getResponseType(statusCode);
const serverName = response.request.socket.servername;
const timeTaken = (new Date() - startTime);
const results = {
statusCode, statusText, serverName, successStatus, timeTaken,
};
const messageText = makeMessageText(results);
results.message = messageText;
return results;
})
.catch((error) => {
render(JSON.stringify({
successStatus: false,
message: error.response ? makeErrorMessage2(error.response) : makeErrorMessage(error),
}));
}).then((results) => {
render(JSON.stringify(results));
});
};
/* Main function, will check if a URL present, and call function */
module.exports = (params, render) => {
if (!params || !params.includes('=')) {
render(JSON.stringify({
success: false,
message: '❌ Malformed URL',
}));
} else {
const url = params.split('=')[1];
makeRequest(url, render);
}
};