avoid extracting the same file mulitple times when the user keeps sending the same request

[hjyssg]

const  extractQueue = {  };

//after 7zip
extractQueue[fileName] = true;


finally {
	extractQueue[fileName] = false;
}

[hjyssg]

let timer;
let count = 0;
const time_out = 1000;
const max_wait_chokidir = 4;

function waitForExtract(){
	checkCache

	if have {
		clearTimeout(timer)
		send back
	}else{
		if(extractQueue[fileName] || count < max_wait_chokidir){
			if(extractQueue[fileName]){
				count++;
			}
			timer = setTimeOut(waitForExtract, time_out);
		}else{
			send 404
		}
	}

}

timer = setTimeOut(waitForExtract, time_out);