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// META: global=window,worker,shadowrealm
// META: script=../resources/recording-streams.js
'use strict';
test(() => {
const rs = new ReadableStream();
const ws = new WritableStream();
assert_false(rs.locked, 'sanity check: the ReadableStream must not start locked');
assert_false(ws.locked, 'sanity check: the WritableStream must not start locked');
rs.pipeTo(ws);
assert_true(rs.locked, 'the ReadableStream must become locked');
assert_true(ws.locked, 'the WritableStream must become locked');
}, 'Piping must lock both the ReadableStream and WritableStream');
promise_test(() => {
const rs = new ReadableStream({
start(controller) {
controller.close();
}
});
const ws = new WritableStream();
return rs.pipeTo(ws).then(() => {
assert_false(rs.locked, 'the ReadableStream must become unlocked');
assert_false(ws.locked, 'the WritableStream must become unlocked');
});
}, 'Piping finishing must unlock both the ReadableStream and WritableStream');
promise_test(t => {
const fakeRS = Object.create(ReadableStream.prototype);
const ws = new WritableStream();
return promise_rejects_js(t, TypeError, ReadableStream.prototype.pipeTo.apply(fakeRS, [ws]),
'pipeTo should reject with a TypeError');
}, 'pipeTo must check the brand of its ReadableStream this value');
promise_test(t => {
const rs = new ReadableStream();
const fakeWS = Object.create(WritableStream.prototype);
return promise_rejects_js(t, TypeError, ReadableStream.prototype.pipeTo.apply(rs, [fakeWS]),
'pipeTo should reject with a TypeError');
}, 'pipeTo must check the brand of its WritableStream argument');
promise_test(t => {
const rs = new ReadableStream();
const ws = new WritableStream();
rs.getReader();
assert_true(rs.locked, 'sanity check: the ReadableStream starts locked');
assert_false(ws.locked, 'sanity check: the WritableStream does not start locked');
return promise_rejects_js(t, TypeError, rs.pipeTo(ws)).then(() => {
assert_false(ws.locked, 'the WritableStream must still be unlocked');
});
}, 'pipeTo must fail if the ReadableStream is locked, and not lock the WritableStream');
promise_test(t => {
const rs = new ReadableStream();
const ws = new WritableStream();
ws.getWriter();
assert_false(rs.locked, 'sanity check: the ReadableStream does not start locked');
assert_true(ws.locked, 'sanity check: the WritableStream starts locked');
return promise_rejects_js(t, TypeError, rs.pipeTo(ws)).then(() => {
assert_false(rs.locked, 'the ReadableStream must still be unlocked');
});
}, 'pipeTo must fail if the WritableStream is locked, and not lock the ReadableStream');
promise_test(() => {
const CHUNKS = 10;
const rs = new ReadableStream({
start(c) {
for (let i = 0; i < CHUNKS; ++i) {
c.enqueue(i);
}
c.close();
}
});
const written = [];
const ws = new WritableStream({
write(chunk) {
written.push(chunk);
},
close() {
written.push('closed');
}
}, new CountQueuingStrategy({ highWaterMark: CHUNKS }));
return rs.pipeTo(ws).then(() => {
const targetValues = [];
for (let i = 0; i < CHUNKS; ++i) {
targetValues.push(i);
}
targetValues.push('closed');
assert_array_equals(written, targetValues, 'the correct values must be written');
// Ensure both readable and writable are closed by the time the pipe finishes.
return Promise.all([
rs.getReader().closed,
ws.getWriter().closed
]);
});
// NOTE: no requirement on *when* the pipe finishes; that is left to implementations.
}, 'Piping from a ReadableStream from which lots of chunks are synchronously readable');
promise_test(t => {
let controller;
const rs = recordingReadableStream({
start(c) {
controller = c;
}
});
const ws = recordingWritableStream();
const pipePromise = rs.pipeTo(ws).then(() => {
assert_array_equals(ws.events, ['write', 'Hello', 'close']);
});
t.step_timeout(() => {
controller.enqueue('Hello');
t.step_timeout(() => controller.close(), 10);
}, 10);
return pipePromise;
}, 'Piping from a ReadableStream for which a chunk becomes asynchronously readable after the pipeTo');
for (const preventAbort of [true, false]) {
promise_test(() => {
const rs = new ReadableStream({
pull() {
return Promise.reject(undefined);
}
});
return rs.pipeTo(new WritableStream(), { preventAbort }).then(
() => assert_unreached('pipeTo promise should be rejected'),
value => assert_equals(value, undefined, 'rejection value should be undefined'));
}, `an undefined rejection from pull should cause pipeTo() to reject when preventAbort is ${preventAbort}`);
}
for (const preventCancel of [true, false]) {
promise_test(() => {
const rs = new ReadableStream({
pull(controller) {
controller.enqueue(0);
}
});
const ws = new WritableStream({
write() {
return Promise.reject(undefined);
}
});
return rs.pipeTo(ws, { preventCancel }).then(
() => assert_unreached('pipeTo promise should be rejected'),
value => assert_equals(value, undefined, 'rejection value should be undefined'));
}, `an undefined rejection from write should cause pipeTo() to reject when preventCancel is ${preventCancel}`);
}
promise_test(t => {
const rs = new ReadableStream();
const ws = new WritableStream();
return promise_rejects_js(t, TypeError, rs.pipeTo(ws, {
get preventAbort() {
ws.getWriter();
}
}), 'pipeTo should reject');
}, 'pipeTo() should reject if an option getter grabs a writer');
promise_test(t => {
const rs = new ReadableStream({
start(controller) {
controller.close();
}
});
const ws = new WritableStream();
return rs.pipeTo(ws, null);
}, 'pipeTo() promise should resolve if null is passed');
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