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// Common Javascript functions used by the examples
function convertTypedArray(src, type) {
var buffer = new ArrayBuffer(src.byteLength);
var baseView = new src.constructor(buffer).set(src);
return new type(buffer);
}
var printTextarea = (function() {
var element = document.getElementById('output');
if (element) element.value = ''; // clear browser cache
return function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
console.log(text);
if (element) {
element.value += text + "\n";
element.scrollTop = element.scrollHeight; // focus on bottom
}
};
})();
async function clearCache() {
if (confirm('Are you sure you want to clear the cache?\nAll the models will be downloaded again.')) {
indexedDB.deleteDatabase(dbName);
location.reload();
}
}
// fetch a remote file from remote URL using the Fetch API
async function fetchRemote(url, cbProgress, cbPrint) {
cbPrint('fetchRemote: downloading with fetch()...');
const response = await fetch(
url,
{
method: 'GET',
headers: {
'Content-Type': 'application/octet-stream',
},
}
);
if (!response.ok) {
cbPrint('fetchRemote: failed to fetch ' + url);
return;
}
const contentLength = response.headers.get('content-length');
const total = parseInt(contentLength, 10);
const reader = response.body.getReader();
var chunks = [];
var receivedLength = 0;
var progressLast = -1;
while (true) {
const { done, value } = await reader.read();
if (done) {
break;
}
chunks.push(value);
receivedLength += value.length;
if (contentLength) {
cbProgress(receivedLength/total);
var progressCur = Math.round((receivedLength / total) * 10);
if (progressCur != progressLast) {
cbPrint('fetchRemote: fetching ' + 10*progressCur + '% ...');
progressLast = progressCur;
}
}
}
var position = 0;
var chunksAll = new Uint8Array(receivedLength);
for (var chunk of chunks) {
chunksAll.set(chunk, position);
position += chunk.length;
}
return chunksAll;
}
// load remote data
// - check if the data is already in the IndexedDB
// - if not, fetch it from the remote URL and store it in the IndexedDB
function loadRemote(url, dst, size_mb, cbProgress, cbReady, cbCancel, cbPrint) {
if (!navigator.storage || !navigator.storage.estimate) {
cbPrint('loadRemote: navigator.storage.estimate() is not supported');
} else {
// query the storage quota and print it
navigator.storage.estimate().then(function (estimate) {
cbPrint('loadRemote: storage quota: ' + estimate.quota + ' bytes');
cbPrint('loadRemote: storage usage: ' + estimate.usage + ' bytes');
});
}
// check if the data is already in the IndexedDB
var rq = indexedDB.open(dbName, dbVersion);
rq.onupgradeneeded = function (event) {
var db = event.target.result;
if (db.version == 1) {
var os = db.createObjectStore('models', { autoIncrement: false });
cbPrint('loadRemote: created IndexedDB ' + db.name + ' version ' + db.version);
} else {
// clear the database
var os = event.currentTarget.transaction.objectStore('models');
os.clear();
cbPrint('loadRemote: cleared IndexedDB ' + db.name + ' version ' + db.version);
}
};
rq.onsuccess = function (event) {
var db = event.target.result;
var tx = db.transaction(['models'], 'readonly');
var os = tx.objectStore('models');
var rq = os.get(url);
rq.onsuccess = function (event) {
if (rq.result) {
cbPrint('loadRemote: "' + url + '" is already in the IndexedDB');
cbReady(dst, rq.result);
} else {
// data is not in the IndexedDB
cbPrint('loadRemote: "' + url + '" is not in the IndexedDB');
// alert and ask the user to confirm
if (!confirm(
'You are about to download ' + size_mb + ' MB of data.\n' +
'The model data will be cached in the browser for future use.\n\n' +
'Press OK to continue.')) {
cbCancel();
return;
}
fetchRemote(url, cbProgress, cbPrint).then(function (data) {
if (data) {
// store the data in the IndexedDB
var rq = indexedDB.open(dbName, dbVersion);
rq.onsuccess = function (event) {
var db = event.target.result;
var tx = db.transaction(['models'], 'readwrite');
var os = tx.objectStore('models');
var rq = null;
try {
var rq = os.put(data, url);
} catch (e) {
cbPrint('loadRemote: failed to store "' + url + '" in the IndexedDB: \n' + e);
cbCancel();
return;
}
rq.onsuccess = function (event) {
cbPrint('loadRemote: "' + url + '" stored in the IndexedDB');
cbReady(dst, data);
};
rq.onerror = function (event) {
cbPrint('loadRemote: failed to store "' + url + '" in the IndexedDB');
cbCancel();
};
};
}
});
}
};
rq.onerror = function (event) {
cbPrint('loadRemote: failed to get data from the IndexedDB');
cbCancel();
};
};
rq.onerror = function (event) {
cbPrint('loadRemote: failed to open IndexedDB');
cbCancel();
};
rq.onblocked = function (event) {
cbPrint('loadRemote: failed to open IndexedDB: blocked');
cbCancel();
};
rq.onabort = function (event) {
cbPrint('loadRemote: failed to open IndexedDB: abort');
cbCancel();
};
}
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