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idb-binary-key-roundtrip.htm
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<!doctype html>
<meta charset=utf-8>
<title>IndexedDB: Binary keys written to a database and read back</title>
<meta name=timeout content=long>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/support.js"></script>
<script>
const sample = [0x44, 0x33, 0x22, 0x11, 0xFF, 0xEE, 0xDD, 0xCC];
const buffer = new Uint8Array(sample).buffer;
function assert_key_valid(a, message) {
assert_equals(indexedDB.cmp(a, a), 0, message);
}
function assert_buffer_equals(a, b, message) {
assert_array_equals(
Array.from(new Uint8Array(a)), Array.from(new Uint8Array(b)), message);
}
// Verifies that a JavaScript value round-trips through IndexedDB as a key.
function check_key_roundtrip_and_done(t, db, key, key_buffer) {
const tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
const store = tx.objectStore('store');
// Verify put with key
const put_request = store.put('value', key);
put_request.onerror = t.unreached_func('put should succeed');
// Verify get with key
const get_request = store.get(key);
get_request.onerror = t.unreached_func('get should succeed');
get_request.onsuccess = t.step_func(() => {
assert_equals(
get_request.result, 'value',
'get should retrieve the value given to put');
// Verify iteration returning key
const cursor_request = store.openCursor();
cursor_request.onerror = t.unreached_func('openCursor should succeed');
cursor_request.onsuccess = t.step_func(() => {
assert_not_equals(
cursor_request.result, null, 'cursor should be present');
const retrieved_key = cursor_request.result.key;
assert_true(
retrieved_key instanceof ArrayBuffer,
'IndexedDB binary keys should be returned in ArrayBuffer instances');
assert_key_equals(
retrieved_key, key,
'The key returned by IndexedDB should equal the key given to put()');
assert_buffer_equals(
retrieved_key, key_buffer,
'The ArrayBuffer returned by IndexedDB should equal the buffer ' +
'backing the key given to put()');
t.done();
});
});
}
// Checks that IndexedDB handles the given view type for binary keys correctly.
function view_type_test(type) {
indexeddb_test(
(t, db) => { db.createObjectStore('store'); },
(t, db) => {
const key = new self[type](buffer);
assert_key_valid(key, `${type} should be usable as an IndexedDB key`);
assert_key_equals(key, buffer,
'Binary keys with the same data but different view types should be ' +
' equal');
check_key_roundtrip_and_done(t, db, key, buffer);
},
`Binary keys can be supplied using the view type ${type}`,
);
}
[
'Uint8Array',
'Uint8ClampedArray',
'Int8Array',
'Uint16Array',
'Int16Array',
'Uint32Array',
'Int32Array',
'Float32Array',
'Float64Array'
].forEach((type) => { view_type_test(type); });
// Checks that IndexedDB
function value_test(value_description, value, value_buffer) {
indexeddb_test(
(t, db) => { db.createObjectStore('store'); },
(t, db) => {
assert_key_valid(
value, value_description + ' should be usable as an valid key');
check_key_roundtrip_and_done(t, db, value, value_buffer);
},
`${value_description} can be used to supply a binary key`
);
}
value_test('ArrayBuffer', buffer, buffer);
value_test('DataView', new DataView(buffer), buffer);
value_test('DataView with explicit offset', new DataView(buffer, 3),
new Uint8Array([0x11, 0xFF, 0xEE, 0xDD, 0xCC]).buffer);
value_test('DataView with explicit offset and length',
new DataView(buffer, 3, 4),
new Uint8Array([0x11, 0xFF, 0xEE, 0xDD]).buffer);
value_test('Uint8Array with explicit offset', new Uint8Array(buffer, 3),
new Uint8Array([0x11, 0xFF, 0xEE, 0xDD, 0xCC]).buffer);
value_test('Uint8Array with explicit offset and length',
new Uint8Array(buffer, 3, 4),
new Uint8Array([0x11, 0xFF, 0xEE, 0xDD]).buffer);
</script>