94 lines
3.1 KiB
JavaScript
94 lines
3.1 KiB
JavaScript
// META: title=Blob Stream
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// META: script=../support/Blob.js
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// META: script=/common/gc.js
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'use strict';
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// Helper function that triggers garbage collection while reading a chunk
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// if perform_gc is true.
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async function read_and_gc(reader, perform_gc) {
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// Passing Uint8Array for byte streams; non-byte streams will simply ignore it
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const read_promise = reader.read(new Uint8Array(64));
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if (perform_gc) {
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await garbageCollect();
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}
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return read_promise;
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}
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// Takes in a ReadableStream and reads from it until it is done, returning
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// an array that contains the results of each read operation. If perform_gc
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// is true, garbage collection is triggered while reading every chunk.
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async function read_all_chunks(stream, { perform_gc = false, mode } = {}) {
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assert_true(stream instanceof ReadableStream);
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assert_true('getReader' in stream);
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const reader = stream.getReader({ mode });
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assert_true('read' in reader);
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let read_value = await read_and_gc(reader, perform_gc);
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let out = [];
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let i = 0;
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while (!read_value.done) {
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for (let val of read_value.value) {
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out[i++] = val;
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}
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read_value = await read_and_gc(reader, perform_gc);
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}
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return out;
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}
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promise_test(async () => {
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const blob = new Blob(["PASS"]);
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const stream = blob.stream();
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const chunks = await read_all_chunks(stream);
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for (let [index, value] of chunks.entries()) {
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assert_equals(value, "PASS".charCodeAt(index));
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}
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}, "Blob.stream()")
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promise_test(async () => {
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const blob = new Blob();
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const stream = blob.stream();
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const chunks = await read_all_chunks(stream);
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assert_array_equals(chunks, []);
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}, "Blob.stream() empty Blob")
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promise_test(async () => {
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const input_arr = [8, 241, 48, 123, 151];
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const typed_arr = new Uint8Array(input_arr);
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const blob = new Blob([typed_arr]);
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const stream = blob.stream();
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const chunks = await read_all_chunks(stream);
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assert_array_equals(chunks, input_arr);
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}, "Blob.stream() non-unicode input")
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promise_test(async() => {
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const input_arr = [8, 241, 48, 123, 151];
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const typed_arr = new Uint8Array(input_arr);
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let blob = new Blob([typed_arr]);
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const stream = blob.stream();
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blob = null;
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await garbageCollect();
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const chunks = await read_all_chunks(stream, { perform_gc: true });
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assert_array_equals(chunks, input_arr);
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}, "Blob.stream() garbage collection of blob shouldn't break stream " +
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"consumption")
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promise_test(async() => {
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const input_arr = [8, 241, 48, 123, 151];
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const typed_arr = new Uint8Array(input_arr);
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let blob = new Blob([typed_arr]);
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const chunksPromise = read_all_chunks(blob.stream());
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// It somehow matters to do GC here instead of doing `perform_gc: true`
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await garbageCollect();
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assert_array_equals(await chunksPromise, input_arr);
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}, "Blob.stream() garbage collection of stream shouldn't break stream " +
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"consumption")
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promise_test(async () => {
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const input_arr = [8, 241, 48, 123, 151];
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const typed_arr = new Uint8Array(input_arr);
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let blob = new Blob([typed_arr]);
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const stream = blob.stream();
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const chunks = await read_all_chunks(stream, { mode: "byob" });
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assert_array_equals(chunks, input_arr);
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}, "Reading Blob.stream() with BYOB reader")
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