File size: 11,062 Bytes
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const fs = require("fs");
const path = require("path");
const vm = require("vm");
function loadManager(fetchImpl) {
const timers = new Map();
let nextTimer = 1;
const sandbox = {
self: {},
DOMException,
Response,
ReadableStream,
AbortController,
fetch: fetchImpl,
setTimeout(callback) {
const id = nextTimer++;
timers.set(id, callback);
return id;
},
clearTimeout(id) {
timers.delete(id);
}
};
sandbox.self = sandbox;
vm.runInNewContext(
fs.readFileSync(path.join(__dirname, "../static/reader-request-manager.js"), "utf8"),
sandbox
);
return { manager: sandbox.VoiceOfMLReaderRequests.createReaderRequestManager(), timers };
}
async function main() {
let resolveFetch,
calls = 0;
const shared = loadManager(() => {
calls += 1;
return new Promise((resolve) => {
resolveFetch = resolve;
});
});
const first = shared.manager.request("book", 1000),
second = shared.manager.request("book", 1000);
await Promise.resolve();
assert.notStrictEqual(first, second);
assert.strictEqual(calls, 1);
assert.strictEqual(shared.timers.size, 1);
resolveFetch(new Response("shared body", { status: 200 }));
const [firstResponse, secondResponse] = await Promise.all([first, second]);
assert.notStrictEqual(firstResponse, secondResponse);
assert.strictEqual(await firstResponse.text(), "shared body");
assert.strictEqual(await secondResponse.text(), "shared body");
assert.strictEqual(shared.manager.pendingCount, 0);
assert.strictEqual(shared.manager.activeCount, 0);
assert.strictEqual(shared.timers.size, 0);
const timedOut = loadManager(
(_url, { signal }) =>
new Promise((_resolve, reject) => {
signal.onabort = () => reject(new DOMException("timed out", "AbortError"));
})
);
const timedRequest = timedOut.manager.request("timeout", 25);
await Promise.resolve();
[...timedOut.timers.values()][0]();
await assert.rejects(timedRequest, (error) => error.name === "TimeoutError");
assert.strictEqual(timedOut.manager.pendingCount, 0);
assert.strictEqual(timedOut.timers.size, 0);
let attempts = 0;
const retry = loadManager(() =>
++attempts === 1 ? Promise.reject(new Error("temporary")) : Promise.resolve({ ok: true })
);
await assert.rejects(retry.manager.request("retry", 1000), /temporary/);
assert.strictEqual((await retry.manager.request("retry", 1000)).ok, true);
assert.strictEqual(attempts, 2);
const disposed = loadManager(
(_url, { signal }) =>
new Promise((_resolve, reject) => {
signal.onabort = () => reject(new DOMException("aborted", "AbortError"));
})
);
const pending = disposed.manager.request("slow", 1000);
await Promise.resolve();
disposed.manager.dispose();
await assert.rejects(pending, (error) => error.name === "AbortError");
assert.strictEqual(disposed.manager.pendingCount, 0);
assert.strictEqual(disposed.timers.size, 0);
await assert.rejects(
disposed.manager.request("late", 1000),
(error) => error.name === "AbortError"
);
let streamController;
const bodyTimeout = loadManager((_url, { signal }) =>
Promise.resolve(
new Response(
new ReadableStream({
start(controller) {
streamController = controller;
signal.onabort = () => controller.error(new DOMException("timed out", "AbortError"));
}
}),
{ status: 200 }
)
)
);
const bodyRequest = bodyTimeout.manager.request("body", 25);
const bodyResponse = await bodyRequest;
assert.strictEqual(bodyTimeout.timers.size, 1);
[...bodyTimeout.timers.values()][0]();
await assert.rejects(bodyResponse.text(), (error) => error.name === "TimeoutError");
assert.ok(streamController);
assert.strictEqual(bodyTimeout.timers.size, 0);
assert.strictEqual(bodyTimeout.manager.activeCount, 0);
// Fetch headers have settled, but both independent bodies still need disposal.
let bodyCancels = 0;
const signals = [];
const streaming = loadManager((_url, { signal }) => {
signals.push(signal);
return Promise.resolve(
new Response(
new ReadableStream({
cancel(reason) {
assert.strictEqual(reason.name, "AbortError");
bodyCancels++;
}
})
)
);
});
const firstBody = await streaming.manager.request("stream", 1000);
const secondBody = await streaming.manager.request("stream", 1000);
assert.strictEqual(streaming.manager.pendingCount, 0);
assert.strictEqual(streaming.manager.activeCount, 2);
const firstReading = assert.rejects(firstBody.text(), (error) => error.name === "AbortError");
streaming.manager.dispose();
await firstReading;
await assert.rejects(secondBody.text(), (error) => error.name === "AbortError");
assert.strictEqual(bodyCancels, 2);
assert.ok(signals.every((signal) => signal.aborted));
assert.strictEqual(streaming.timers.size, 0);
assert.strictEqual(streaming.manager.activeCount, 0);
streaming.manager.dispose();
assert.strictEqual(bodyCancels, 2);
let finishClonedFetch,
cloneCancels = 0;
const cloned = loadManager(
() =>
new Promise((resolve) => {
finishClonedFetch = resolve;
})
);
const cloneOne = cloned.manager.request("clones", 1000),
cloneTwo = cloned.manager.request("clones", 1000);
await Promise.resolve();
finishClonedFetch(
new Response(
new ReadableStream({
cancel() {
cloneCancels++;
}
})
)
);
const cloneResponses = await Promise.all([cloneOne, cloneTwo]);
const cloneReads = cloneResponses.map((response) =>
assert.rejects(response.text(), (error) => error.name === "AbortError")
);
cloned.manager.dispose();
await Promise.all(cloneReads);
assert.strictEqual(cloneCancels, 1);
assert.strictEqual(cloned.manager.activeCount, 0);
const cancelled = loadManager(() => Promise.resolve(new Response(new ReadableStream())));
const cancelResponse = await cancelled.manager.request("cancel", 1000);
await cancelResponse.body.cancel();
assert.strictEqual(cancelled.manager.activeCount, 0);
assert.strictEqual(cancelled.timers.size, 0);
let queuedCalls = 0;
const queued = loadManager(() => {
queuedCalls++;
return Promise.resolve(new Response("unused"));
});
const queuedRequest = queued.manager.request("queued", 1000);
queued.manager.dispose();
await assert.rejects(queuedRequest, (error) => error.name === "AbortError");
assert.strictEqual(queuedCalls, 0);
assert.strictEqual(queued.manager.activeCount, 0);
let finishLate,
lateCancels = 0;
const late = loadManager(
() =>
new Promise((resolve) => {
finishLate = resolve;
})
);
const lateRequest = late.manager.request("late-response", 1000);
await Promise.resolve();
late.manager.dispose();
finishLate(
new Response(
new ReadableStream({
cancel() {
lateCancels++;
}
})
)
);
await assert.rejects(lateRequest, (error) => error.name === "AbortError");
assert.strictEqual(lateCancels, 1);
assert.strictEqual(late.manager.activeCount, 0);
// Exercise the same cancellation boundaries for deadlines and lifecycle disposal.
for (const timeout of [true, false]) {
const name = timeout ? "TimeoutError" : "AbortError";
const stop = (harness) => {
if (timeout) [...harness.timers.values()][0]();
else harness.manager.dispose();
};
const assertSettled = (harness) => {
assert.strictEqual(harness.manager.pendingCount, 0);
assert.strictEqual(harness.manager.activeCount, 0);
assert.strictEqual(harness.timers.size, 0);
assert.strictEqual(harness.manager.disposed, !timeout);
};
let starts = 0;
const beforeFetch = loadManager(() => {
starts++;
return Promise.resolve(new Response("unused"));
});
const queued = beforeFetch.manager.request("queued", 25);
stop(beforeFetch);
await assert.rejects(queued, (error) => error.name === name);
assert.strictEqual(starts, 0);
assertSettled(beforeFetch);
let headerSignal;
const headers = loadManager((_url, { signal }) => {
headerSignal = signal;
return new Promise((_resolve, reject) => {
// Some transports reject with AbortError even when given a custom reason.
signal.addEventListener(
"abort",
() => reject(new DOMException("transport aborted", "AbortError")),
{ once: true }
);
});
});
const headerRequests = [
headers.manager.request("headers", 25),
headers.manager.request("headers", 25)
];
await Promise.resolve();
stop(headers);
await Promise.all(
headerRequests.map((request) =>
assert.rejects(request, (error) => error === headerSignal.reason && error.name === name)
)
);
assertSettled(headers);
let finish, lateSignal, cancelledWith;
const delayedHeaders = loadManager((_url, { signal }) => {
lateSignal = signal;
return new Promise((resolve) => {
finish = resolve;
});
});
const delayedRequest = delayedHeaders.manager.request("late", 25);
await Promise.resolve();
stop(delayedHeaders);
finish(
new Response(
new ReadableStream({
cancel(reason) {
cancelledWith = reason;
}
})
)
);
await assert.rejects(
delayedRequest,
(error) => error === lateSignal.reason && error.name === name
);
assert.strictEqual(cancelledWith, lateSignal.reason);
assertSettled(delayedHeaders);
let bodySignal,
cancels = 0;
const bodies = loadManager((_url, { signal }) => {
bodySignal = signal;
return Promise.resolve(
new Response(
new ReadableStream({
cancel(reason) {
assert.strictEqual(reason, signal.reason);
assert.strictEqual(reason.name, name);
cancels++;
}
})
)
);
});
const responses = await Promise.all([
bodies.manager.request("clones", 25),
bodies.manager.request("clones", 25)
]);
assert.notStrictEqual(responses[0], responses[1]);
assert.strictEqual(bodies.manager.pendingCount, 0);
assert.strictEqual(bodies.manager.activeCount, 1);
const reads = responses.map((response) =>
assert.rejects(response.text(), (error) => error.name === name)
);
stop(bodies);
const firstReason = bodySignal.reason;
bodies.manager.dispose();
await Promise.all(reads);
assert.strictEqual(bodySignal.reason, firstReason);
assert.strictEqual(bodySignal.reason.name, name);
assert.strictEqual(cancels, 1);
assert.strictEqual(bodies.manager.activeCount, 0);
assert.strictEqual(bodies.timers.size, 0);
}
console.log("reader request manager contracts passed");
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});
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