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import waitForPromises from 'helpers/wait_for_promises';
import { rateLimitStreamRequests } from '~/streaming/rate_limit_stream_requests';
describe('rateLimitStreamRequests', () => {
const encoder = new TextEncoder('utf-8');
const createStreamResponse = (content = 'foo') =>
new ReadableStream({
pull(controller) {
controller.enqueue(encoder.encode(content));
controller.close();
},
});
const createFactory = (content) => {
return jest.fn(() => {
return Promise.resolve(createStreamResponse(content));
});
};
it('does nothing for zero total requests', () => {
const factory = jest.fn();
const requests = rateLimitStreamRequests({
factory,
total: 0,
});
expect(factory).toHaveBeenCalledTimes(0);
expect(requests.length).toBe(0);
});
it('does not exceed total requests', () => {
const factory = createFactory();
const requests = rateLimitStreamRequests({
factory,
immediateCount: 100,
maxConcurrentRequests: 100,
total: 2,
});
expect(factory).toHaveBeenCalledTimes(2);
expect(requests.length).toBe(2);
});
it('creates immediate requests', () => {
const factory = createFactory();
const requests = rateLimitStreamRequests({
factory,
maxConcurrentRequests: 2,
total: 2,
});
expect(factory).toHaveBeenCalledTimes(2);
expect(requests.length).toBe(2);
});
it('returns correct values', async () => {
const fixture = 'foobar';
const factory = createFactory(fixture);
const requests = rateLimitStreamRequests({
factory,
maxConcurrentRequests: 2,
total: 2,
});
const decoder = new TextDecoder('utf-8');
let result = '';
for await (const stream of requests) {
await stream.pipeTo(
new WritableStream({
// eslint-disable-next-line no-loop-func
write(content) {
result += decoder.decode(content);
},
}),
);
}
expect(result).toBe(fixture + fixture);
});
it('delays rate limited requests', async () => {
const factory = createFactory();
const requests = rateLimitStreamRequests({
factory,
maxConcurrentRequests: 2,
total: 3,
});
expect(factory).toHaveBeenCalledTimes(2);
expect(requests.length).toBe(3);
await waitForPromises();
expect(factory).toHaveBeenCalledTimes(3);
});
it('runs next request after previous has been fulfilled', async () => {
let res;
const factory = jest
.fn()
.mockImplementationOnce(
() =>
new Promise((resolve) => {
res = resolve;
}),
)
.mockImplementationOnce(() => Promise.resolve(createStreamResponse()));
const requests = rateLimitStreamRequests({
factory,
maxConcurrentRequests: 1,
total: 2,
});
expect(factory).toHaveBeenCalledTimes(1);
expect(requests.length).toBe(2);
await waitForPromises();
expect(factory).toHaveBeenCalledTimes(1);
res(createStreamResponse());
await waitForPromises();
expect(factory).toHaveBeenCalledTimes(2);
});
it('uses timer to schedule next request', async () => {
let res;
const factory = jest
.fn()
.mockImplementationOnce(
() =>
new Promise((resolve) => {
res = resolve;
}),
)
.mockImplementationOnce(() => Promise.resolve(createStreamResponse()));
const requests = rateLimitStreamRequests({
factory,
immediateCount: 1,
maxConcurrentRequests: 2,
total: 2,
timeout: 9999,
});
expect(factory).toHaveBeenCalledTimes(1);
expect(requests.length).toBe(2);
await waitForPromises();
expect(factory).toHaveBeenCalledTimes(1);
jest.runAllTimers();
await waitForPromises();
expect(factory).toHaveBeenCalledTimes(2);
res(createStreamResponse());
});
});
|
