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// A web worker which can set indexedDB.
function setIndexedDB() {
return new Promise((resolve, reject) => {
let request = self.indexedDB.open("bounce", 1);
request.onsuccess = () => {
console.info("Opened indexedDB");
resolve();
};
request.onerror = event => {
console.error("Error opening indexedDB", event);
reject();
};
request.onupgradeneeded = event => {
console.info("Initializing indexedDB");
let db = event.target.result;
db.createObjectStore("bounce");
};
});
}
self.onmessage = function (event) {
console.info("Web worker received message", event.data);
if (event.data === "setIndexedDB") {
setIndexedDB().then(() => {
self.postMessage("indexedDBSet");
});
} else if (event.data === "setIndexedDBNested") {
console.info("set state nested");
// Rather than setting indexedDB in this worker spawn a nested worker to set
// indexedDB.
let nestedWorker = new Worker("file_web_worker.js");
nestedWorker.postMessage("setIndexedDB");
nestedWorker.onmessage = () => {
console.info("IndexedDB set in nested worker");
self.postMessage("indexedDBSet");
};
}
};
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