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hydrogen-web/prototypes/chrome-keys2.html

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2019-02-18 04:28:01 +05:30
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<script type="module">
function reqAsPromise(req) {
return new Promise((resolve, reject) => {
req.addEventListener("success", event => resolve(event.target.result));
req.addEventListener("error", event => reject(event.target.error));
});
}
function txnAsPromise(txn) {
return new Promise((resolve, reject) => {
txn.addEventListener("complete", resolve);
txn.addEventListener("abort", reject);
});
}
function readAll(cursor) {
return new Promise((resolve, reject) => {
const results = [];
cursor.onerror = (event) => {
reject(new Error("Query failed: " + event.target.errorCode));
};
cursor.onsuccess = (event) => {
const cursor = event.target.result;
if (!cursor) {
resolve(results);
} else {
results.push(cursor.value);
cursor.continue();
}
};
});
}
let seed = 13423;
function prn() {
let x = Math.sin(seed++) * 10000;
return x - Math.floor(x);
}
function pad(str, len) {
return str + " ".repeat(len - str.length);
}
function formatByteArray(a) {
return `[${Array.from(a).join(",")}]`;
}
async function main() {
let isNew = false;
const openReq = window.indexedDB.open("bin_key_sorting_test", 1);
openReq.onupgradeneeded = (ev) => {
const db = ev.target.result;
db.createObjectStore("test", {keyPath: ["binKey"]});
isNew = true;
};
const db = await reqAsPromise(openReq);
// fill test store with some data
if (isNew) {
const txn = db.transaction("test", "readwrite");
const store = txn.objectStore("test");
const rndByte = () => Math.ceil(prn() * 255);
for(let i = 0; i < 10; ++i) {
const b1 = rndByte(), b2 = rndByte(), b3 = rndByte(), b4 = rndByte();
console.log(`adding key (${b1},${b2},${b3},${b4})`);
store.add({binKey: new Uint8Array([b1, b2, b3, b4])});
}
store.add({binKey: new Uint8Array([0x80, 0x00, 0x00, 0x00])});
store.add({binKey: new Uint8Array([0x00, 0x00, 0x00, 0x00])});
store.add({binKey: new Uint8Array([0x7F, 0xFF, 0xFF, 0xFF])});
store.add({binKey: new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF])});
await txnAsPromise(txn);
}
const txn = db.transaction("test", "readonly");
const store = txn.objectStore("test");
const range = IDBKeyRange.bound(
Uint8Array.from([0x00, 0x00, 0x00, 0x00]).buffer,
Uint8Array.from([0xFF, 0xFF, 0xFF, 0xFF]).buffer,
// new Uint8Array([0x80, 0x00, 0x00, 0x00]).buffer, new
// Uint8Array([0x7F, 0xFF, 0xFF, 0xFF]).buffer,
);
// const values = await readAll(store.openCursor(range, "next"));
const values = await readAll(store.openCursor());
console.log(pad(`[uint8;4]`, 20) + " [int8;4]");
for (const v of values) {
const uintStr = formatByteArray(new Uint8Array(v.binKey));
const intStr = formatByteArray(new Int8Array(v.binKey));
console.log(pad(uintStr, 20) + " " + intStr);
}
}
main();
</script>
</body>
</html>