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import * as uloop from 'uloop';
export const QUIET_MS = 15000;
export function watcher_create(scan, apply, stamp) {
let generation = 0, pending, worker, timer;
function schedule() {
generation++;
pending = true;
timer.set(QUIET_MS);
}
function start() {
if (worker)
return;
let scan_generation = generation, topology = stamp();
pending = false;
worker = uloop.task(function() {
try {
return { inventory: scan() };
} catch (e) {
return { error: '' + e };
}
}, function(result) {
worker = null;
if (scan_generation != generation) {
if (pending && timer.remaining() < 0)
timer.set(0);
return;
}
if (topology != stamp()) {
schedule();
return;
}
if (result.error) {
warn('gst-rtsp discovery: ', result.error, '\n');
return;
}
try {
apply(result.inventory);
} catch (e) {
warn('gst-rtsp configuration: ', e, '\n');
}
});
if (!worker)
die('Cannot start video discovery task\n');
}
timer = uloop.timer(-1, start);
return {
event: schedule,
stop: function() {
timer.cancel();
if (worker)
worker.kill();
}
};
};
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