I have a REST API coded with Node.js and there is one route that applies NTFS Rights to folders. The request can take 1 second but can also last several minutes (it depends on the size of the folder).
To summarize, if the rights take less than 5 seconds to be applied, I want to return the value with the code 200.
If the rights have not finished being applied I would like to return the value with the code 202
...
inProgress = true;
ApplyRights()
.then(() => {
inProgress = false
}
// Here I want to return as fast inProgress = false otherwise wait a bit but max 5s
return ...;
I tried to wait a bit with setTimeout like this:
const sleep = s => new Promise(resolve => {
setTimeout(resolve, s * 1000)
});
let nbCheck = 0;
while (inProgress && nbCheck < 5){
await sleep(1)
nbCheck++;
}
But setTimeout is not called before the end of my previous promise (ApplyRights). I read here that promise are executed before setTimeout
So, i tried to find a solution without setTimeout and I tried this: (I know it's not very elegant)
let dateStop = Date.now() + 5 * 1000;
while (dateStop = Date.now() && inProgress){}
return ...;
But in this case the .then() of ApplyRights is only reached at the end of the 5s.
Is there a way to let my promise ApplyRights do its job. And if the job take time, wait maximum 5 seconds before returning the response. If the job is quick, I want to return the responses without waiting.
You can use Promise.race:
Promise.race([ApplyRights(), sleep(5)]).then(result => {
if (result === undefined) { // Timeout of 5 seconds occurred
// Some message to the user?
} else { // Got reply within 5 seconds
// Do something with the result
}
});
Do realise however, that this does not interrupt the work of ApplyRights(), which eventually may still do the job.