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// META: global=window,worker
// META: script=constants.sub.js
// META: timeout=long
// META: variant=?default
// META: variant=?wss
// META: variant=?wpt_flags=h2
// This is a repro for Chromium bug https://crbug.com/1286909. It will timeout
// if the bug is present.
// With 0.1 second server-side delay per message, sending 50 messages will take
// around 5 seconds.
const MESSAGES_TO_SEND = 50;
// 65536 is the magic number that triggers the bug, as it precisely fills the
// mojo pipe.
const MESSAGE_SIZE = 65536;
promise_test(async t => {
const message = new Uint8Array(MESSAGE_SIZE);
const ws =
new WebSocket(SCHEME_DOMAIN_PORT + '/receive-many-with-backpressure');
let opened = false;
ws.onopen = t.step_func(() => {
opened = true;
for (let i = 0; i < MESSAGES_TO_SEND; i++) {
ws.send(message);
}
});
let responsesReceived = 0;
ws.onmessage = t.step_func(({data}) => {
assert_equals(data, String(MESSAGE_SIZE), 'size must match');
if (++responsesReceived == MESSAGES_TO_SEND) {
ws.close();
}
});
let resolvePromise;
const promise = new Promise(resolve => {
resolvePromise = resolve;
});
ws.onclose = t.step_func(({wasClean}) => {
assert_true(opened, 'connection should have been opened');
assert_true(wasClean, 'close should be clean');
resolvePromise();
});
return promise;
},
`sending ${MESSAGES_TO_SEND} messages of size ${MESSAGE_SIZE} with ` +
'backpressure applied should not hang');
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