up

public/static/webworker_client.js

@@ -0,0 +1,49 @@
+onmessage = function (event) {
+    handleMessage(event.data);
+}
+
+// message = {type: '', task_id: '', [key: string]: any}
+function handleMessage(message) {
+    // console.log("new task from master " + JSON.stringify(message));
+    let type = message['type'];
+
+    if(type === 'fetch'){
+        fetchUrl(message.url).then(function (res) {
+            postMessage({
+                type: 'fetch',
+                task_id: message.task_id,
+                info: JSON.parse(res),
+            })
+        });
+
+        return;
+    }
+}
+
+function processDelay(timeout) {
+    setTimeout(function () {
+        postMessage({
+            type: 'delay',
+            info: 'Its done! ' + timeout,
+        })
+    }, timeout)
+}
+
+
+function fetchUrl(request_url) {
+    return new Promise(function (resolve, reject) {
+        let xhr = new XMLHttpRequest();
+        xhr.open('GET', request_url, true);
+        xhr.onload = function () {
+            if (xhr.status >= 200 && xhr.status < 300) {
+                resolve(xhr.response);
+            } else {
+                reject('error');
+            }
+        };
+        xhr.onerror = function () {
+            reject('error');
+        };
+        xhr.send();
+    });
+}