I'm currently working on an express application that involves a generator function which takes approximately 5 minutes to process a large amount of data. Unfortunately, I am unable to optimize this function any further.
Express has a built-in timeout of 2 minutes, and I do not want to change this setting just for this specific function. I thought that by periodically calling res.write(), the 2-minute rule might no longer apply.
My query is as follows:
How can I implement a res.write('Something') every X seconds while waiting for the other function to complete?
I would like it to perform something similar to the code snippet below, in case you understand my intentions.
function main() {
co(function* () {
const something = yield promise(); // function with long processing time
const doWhileWaiting = setTimeout(() => {
if (!something) {
// Display this message while waiting for the value of 'something'
console.log('Waiting for something ... ');
} else {
console.log(something);
clearInterval(doWhileWaiting);
}
}, 5000);
});
}