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198
ViewsHow to console only one time in terminal if a function is called from http.createServer
index.js file
import http from 'http';
function terminalConsole() {
console.log(5);
}
const server = http.createServer((req, res) => {
terminalConsole();
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello');
});
server.listen(5000, '127.0.0.1', () => {
console.log(`server listening on localhost:5000`);
});
And when called from terminal, getting two 5 output instead of one.
Stackblitz link - https://stackblitz.com/edit/node-t5zngd?file=index.js
·
Juan Pablo Isaza
2 answers
Answer question0
You can use a function to log only once, based on the content of the log:
const logOnceClass = () => {
const cache = new Map()
return (string, logFunction = console.log) => {
// if its already logged, return
if (cache.has(string)) return
logFunction(string)
cache.set(string, true)
}
}
const logOnce = logOnceClass()
logOnce(1) // 1
logOnce(1) // (No log, "1" has been already logged)
logOnce(2) // 2
·
Juan Pablo Isaza
Report
0
Use req.on node.js event in-order to log to console on a specific event.
Here is the fixed version of your code.
const http = require("http");
function terminalConsole() {
console.log(5);
}
const server = http.createServer((req, res) => {
res.setHeader("Content-Type", "text/plain");
res.statusCode = 200;
req.on('end', () => {
terminalConsole();
});
res.end("Hello");
});
server.listen(3001, () => {
console.log(`server listening on localhost:3001`);
});
What happens here is that every time a request has been end, it would log the message to console.
·
Juan Pablo Isaza
Report
Answer question