| // META: global=window,worker,jsshell |
| // META: script=../resources/recording-streams.js |
| // META: script=../resources/rs-utils.js |
| // META: script=../resources/test-utils.js |
| 'use strict'; |
| |
| // The size() function of the readable strategy can re-entrantly call back into the ReadableStream implementation. This |
| // makes it risky to cache state across the call to ReadableStreamDefaultControllerEnqueue. These tests attempt to catch |
| // such errors. They are separated from the other strategy tests because no real user code should ever do anything like |
| // this. |
| |
| const error1 = new Error('error1'); |
| error1.name = 'error1'; |
| |
| promise_test(() => { |
| let controller; |
| let calls = 0; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| ++calls; |
| if (calls < 2) { |
| controller.enqueue('b'); |
| } |
| return 1; |
| } |
| }); |
| controller.enqueue('a'); |
| controller.close(); |
| return readableStreamToArray(rs) |
| .then(array => assert_array_equals(array, ['b', 'a'], 'array should contain two chunks')); |
| }, 'enqueue() inside size() should work'); |
| |
| promise_test(() => { |
| let controller; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| // The queue is empty. |
| controller.close(); |
| // The state has gone from "readable" to "closed". |
| return 1; |
| // This chunk will be enqueued, but will be impossible to read because the state is already "closed". |
| } |
| }); |
| controller.enqueue('a'); |
| return readableStreamToArray(rs) |
| .then(array => assert_array_equals(array, [], 'array should contain no chunks')); |
| // The chunk 'a' is still in rs's queue. It is closed so 'a' cannot be read. |
| }, 'close() inside size() should not crash'); |
| |
| promise_test(() => { |
| let controller; |
| let calls = 0; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| ++calls; |
| if (calls === 2) { |
| // The queue contains one chunk. |
| controller.close(); |
| // The state is still "readable", but closeRequest is now true. |
| } |
| return 1; |
| } |
| }); |
| controller.enqueue('a'); |
| controller.enqueue('b'); |
| return readableStreamToArray(rs) |
| .then(array => assert_array_equals(array, ['a', 'b'], 'array should contain two chunks')); |
| }, 'close request inside size() should work'); |
| |
| promise_test(t => { |
| let controller; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| controller.error(error1); |
| return 1; |
| } |
| }); |
| controller.enqueue('a'); |
| return promise_rejects_exactly(t, error1, rs.getReader().read(), 'read() should reject'); |
| }, 'error() inside size() should work'); |
| |
| promise_test(() => { |
| let controller; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| assert_equals(controller.desiredSize, 1, 'desiredSize should be 1'); |
| return 1; |
| }, |
| highWaterMark: 1 |
| }); |
| controller.enqueue('a'); |
| controller.close(); |
| return readableStreamToArray(rs) |
| .then(array => assert_array_equals(array, ['a'], 'array should contain one chunk')); |
| }, 'desiredSize inside size() should work'); |
| |
| promise_test(t => { |
| let cancelPromise; |
| let controller; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| }, |
| cancel: t.step_func(reason => { |
| assert_equals(reason, error1, 'reason should be error1'); |
| assert_throws_js(TypeError, () => controller.enqueue(), 'enqueue() should throw'); |
| }) |
| }, { |
| size() { |
| cancelPromise = rs.cancel(error1); |
| return 1; |
| }, |
| highWaterMark: Infinity |
| }); |
| controller.enqueue('a'); |
| const reader = rs.getReader(); |
| return Promise.all([ |
| reader.closed, |
| cancelPromise |
| ]); |
| }, 'cancel() inside size() should work'); |
| |
| promise_test(() => { |
| let controller; |
| let pipeToPromise; |
| const ws = recordingWritableStream(); |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| if (!pipeToPromise) { |
| pipeToPromise = rs.pipeTo(ws); |
| } |
| return 1; |
| }, |
| highWaterMark: 1 |
| }); |
| controller.enqueue('a'); |
| assert_not_equals(pipeToPromise, undefined); |
| |
| // Some pipeTo() implementations need an additional chunk enqueued in order for the first one to be processed. See |
| // https://github.com/whatwg/streams/issues/794 for background. |
| controller.enqueue('a'); |
| |
| // Give pipeTo() a chance to process the queued chunks. |
| return delay(0).then(() => { |
| assert_array_equals(ws.events, ['write', 'a', 'write', 'a'], 'ws should contain two chunks'); |
| controller.close(); |
| return pipeToPromise; |
| }).then(() => { |
| assert_array_equals(ws.events, ['write', 'a', 'write', 'a', 'close'], 'target should have been closed'); |
| }); |
| }, 'pipeTo() inside size() should behave as expected'); |
| |
| promise_test(() => { |
| let controller; |
| let readPromise; |
| let calls = 0; |
| let readResolved = false; |
| let reader; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| // This is triggered by controller.enqueue(). The queue is empty and there are no pending reads. This read is |
| // added to the list of pending reads. |
| readPromise = reader.read(); |
| ++calls; |
| return 1; |
| }, |
| highWaterMark: 0 |
| }); |
| reader = rs.getReader(); |
| controller.enqueue('a'); |
| readPromise.then(() => { |
| readResolved = true; |
| }); |
| return flushAsyncEvents().then(() => { |
| assert_false(readResolved); |
| controller.enqueue('b'); |
| assert_equals(calls, 1, 'size() should have been called once'); |
| return delay(0); |
| }).then(() => { |
| assert_true(readResolved); |
| assert_equals(calls, 1, 'size() should only be called once'); |
| return readPromise; |
| }).then(({ value, done }) => { |
| assert_false(done, 'done should be false'); |
| // See https://github.com/whatwg/streams/issues/794 for why this chunk is not 'a'. |
| assert_equals(value, 'b', 'chunk should have been read'); |
| assert_equals(calls, 1, 'calls should still be 1'); |
| return reader.read(); |
| }).then(({ value, done }) => { |
| assert_false(done, 'done should be false again'); |
| assert_equals(value, 'a', 'chunk a should come after b'); |
| }); |
| }, 'read() inside of size() should behave as expected'); |
| |
| promise_test(() => { |
| let controller; |
| let reader; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| reader = rs.getReader(); |
| return 1; |
| } |
| }); |
| controller.enqueue('a'); |
| return reader.read().then(({ value, done }) => { |
| assert_false(done, 'done should be false'); |
| assert_equals(value, 'a', 'value should be a'); |
| }); |
| }, 'getReader() inside size() should work'); |
| |
| promise_test(() => { |
| let controller; |
| let branch1; |
| let branch2; |
| const rs = new ReadableStream({ |
| start(c) { |
| controller = c; |
| } |
| }, { |
| size() { |
| [branch1, branch2] = rs.tee(); |
| return 1; |
| } |
| }); |
| controller.enqueue('a'); |
| assert_true(rs.locked, 'rs should be locked'); |
| controller.close(); |
| return Promise.all([ |
| readableStreamToArray(branch1).then(array => assert_array_equals(array, ['a'], 'branch1 should have one chunk')), |
| readableStreamToArray(branch2).then(array => assert_array_equals(array, ['a'], 'branch2 should have one chunk')) |
| ]); |
| }, 'tee() inside size() should work'); |