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import contextlib
import json
import re
import threading
import time
import unittest
import urllib.parse
from unittest.mock import patch
from tests.test_reader_performance import (
PlaywrightError, StaticHandler, minimal_pdf, static_server, sync_playwright,
)
MODULE = '**/static/vendor/pdf.min.*.mjs*'
SOURCE = 'https://huggingface.co/datasets/VoiceOfML/Test/resolve/main/cold-retry.pdf'
@unittest.skipIf(sync_playwright is None, 'Playwright is unavailable')
class PdfLoadingTests(unittest.TestCase):
@classmethod
def setUpClass(cls):
resources = contextlib.ExitStack()
cls.addClassCleanup(resources.close)
cls.origin = resources.enter_context(static_server())
playwright = resources.enter_context(sync_playwright())
try:
cls.browser = playwright.chromium.launch(headless=True, args=['--no-sandbox'])
except PlaywrightError as error:
raise unittest.SkipTest(str(error))
cls.addClassCleanup(cls.browser.close)
def setUp(self):
self.context = self.browser.new_context(service_workers='block')
self.addCleanup(self.context.close)
self.page = self.context.new_page()
self.page.set_default_timeout(10000)
self.errors, self.modules, self.documents = [], [], []
self.page.on('pageerror', lambda error: self.errors.append(str(error)))
self.page.on('request', lambda request: self.modules.append(request.url)
if '/vendor/pdf.min.' in request.url else None)
self.page.route('**/api/reader-content**', self.document)
cdp = self.context.new_cdp_session(self.page)
cdp.send('Network.enable')
cdp.send('Network.setCacheDisabled', {'cacheDisabled': True})
def document(self, route):
self.documents.append(route.request.url)
route.fulfill(content_type='application/pdf', body=minimal_pdf())
def open(self):
self.page.goto(self.origin + '/static/reader.html?' + urllib.parse.urlencode(
dict(url=SOURCE, ext='pdf', title='Cold retry')), wait_until='domcontentloaded')
def ready(self):
self.page.locator('.reader-page canvas.ready').wait_for(state='attached')
self.assertEqual(self.page.locator('#status').text_content(), '1 \u9875')
self.assertEqual(self.errors, [])
def test_cold_success_uses_one_module_request(self):
self.open()
self.ready()
self.assertEqual(len(self.modules), 1)
self.assertNotIn('reader-module-retry', self.modules[0])
def test_pdf_engine_preloads_before_id_resolution(self):
pending = []
self.page.route('**/api/reader-resolve?**', lambda route: pending.append(route))
with self.page.expect_worker() as opened:
self.page.goto(self.origin + '/static/reader.html?id=398vk0yyy8m29&ext=pdf', wait_until='domcontentloaded')
worker = opened.value
worker.evaluate('''() => new Promise((resolve, reject) => {
const deadline = setTimeout(() => reject(Error('Worker did not initialize')), 5000);
const check = () => globalThis.pdfjsWorker ? (clearTimeout(deadline), resolve(true)) : setTimeout(check, 10);
check();
})''')
self.assertEqual(len(pending), 1)
self.assertEqual(self.documents, [])
pending[0].fulfill(content_type='application/json', body=json.dumps({
'url': SOURCE, 'download': SOURCE, 'extension': 'pdf',
}))
self.ready()
self.assertEqual(len(self.page.workers), 1)
self.assertEqual(len(pending), 1)
def test_early_resolve_runs_before_main_module_and_retries_transient_http_once(self):
held, lookups = [], []
self.page.route('**/static/reader.js*', lambda route: held.append(route))
def lookup(route):
lookups.append(route)
if len(lookups) == 1:
route.fulfill(status=503, body='try again')
else:
route.fulfill(content_type='application/json', body=json.dumps({
'url': SOURCE, 'download': SOURCE, 'extension': 'pdf',
}))
self.page.route('**/api/reader-resolve?**', lookup)
self.page.goto(self.origin + '/static/reader.html?id=398vk0yyy8m29&ext=pdf', wait_until='commit')
self.page.wait_for_function('() => !!window.__VOICE_READER_RESOLVE__')
self.assertEqual(self.page.evaluate('() => window.__VOICE_READER_RESOLVE__.promise.then(x => x.status)'), 503)
self.assertEqual(self.documents, [])
self.page.unroute('**/static/reader.js*')
for route in held: route.continue_()
self.ready()
self.assertEqual(len(lookups), 2)
def test_disposal_terminates_prepared_worker_and_pending_resolve(self):
self.page.add_init_script('''window.__lookupAborted = false;
const nativeFetch = window.fetch;
window.fetch = (url, options) => String(url).includes('/api/reader-resolve?')
? new Promise((resolve, reject) => options.signal.addEventListener('abort', () => {
window.__lookupAborted = true; reject(new DOMException('closed', 'AbortError'));
}, {once:true})) : nativeFetch(url, options);''')
with self.page.expect_worker() as opened:
self.page.goto(self.origin + '/static/reader.html?id=398vk0yyy8m29&ext=pdf', wait_until='domcontentloaded')
with opened.value.expect_event('close'):
self.page.evaluate("() => window.dispatchEvent(new Event('pagehide'))")
self.assertTrue(self.page.evaluate('() => window.__lookupAborted'))
self.assertEqual(self.documents, [])
self.assertEqual(self.errors, [])
def test_cached_resolution_skips_early_network_lookup(self):
self.page.add_init_script('sessionStorage.setItem("reader-resolve:398vk0yyy8m29", ' +
json.dumps(json.dumps({'url': SOURCE, 'download': SOURCE, 'extension': 'pdf'})) + ');')
lookups = []
self.page.route('**/api/reader-resolve?**', lambda route: (lookups.append(route.request.url), route.abort()))
self.page.goto(self.origin + '/static/reader.html?id=398vk0yyy8m29&ext=pdf', wait_until='domcontentloaded')
self.ready()
self.assertEqual(lookups, [])
def test_worker_timeout_terminates_once_and_exposes_retry(self):
self.page.add_init_script('''const native = window.setTimeout.bind(window);
window.setTimeout = (fn, ms, ...args) => native(fn, ms === 20000 ? 250 : ms, ...args);''')
self.page.route(MODULE, lambda route: route.fulfill(content_type='text/javascript', body='''
export const GlobalWorkerOptions = {};
export class PDFWorker {
promise = new Promise(() => {});
destroy() { window.__workerDestroys = (window.__workerDestroys || 0) + 1; }
}
export function getDocument() { throw Error('must not fetch before Worker readiness'); }
'''))
self.open()
self.page.locator('#reader-engine-retry').wait_for()
self.assertEqual(self.page.evaluate('() => window.__workerDestroys'), 1)
self.assertEqual(self.documents, [])
self.assertEqual(self.errors, [])
def test_proxy_failure_reuses_prepared_worker_for_original_source(self):
self.page.unroute('**/api/reader-content**')
self.page.route('**/api/reader-content**', lambda route: route.fulfill(status=403, body='forbidden'))
self.page.route(SOURCE, self.document)
self.open()
self.ready()
self.assertEqual(self.documents, [SOURCE])
self.assertEqual(len(self.page.workers), 1)
def test_resolved_non_pdf_releases_speculative_worker(self):
pending = []
self.page.route('**/api/reader-resolve?**', lambda route: pending.append(route))
self.page.unroute('**/api/reader-content**')
self.page.route('**/api/reader-content**', lambda route: route.fulfill(content_type='text/plain', body='Resolved text'))
with self.page.expect_worker() as opened:
self.page.goto(self.origin + '/static/reader.html?id=398vk0yyy8m29&ext=pdf', wait_until='domcontentloaded')
with opened.value.expect_event('close'):
pending[0].fulfill(content_type='application/json', body=json.dumps({
'url': SOURCE.replace('.pdf', '.txt'), 'extension': 'txt',
}))
self.page.locator('#content').get_by_text('Resolved text').wait_for()
self.assertEqual(self.errors, [])
def test_large_original_pdf_renders_using_bounded_ranges_and_stops_transfer(self):
# A valid large stream object before the xref, not padding after EOF.
small = minimal_pdf()
xref = small.index(b'xref\n')
attachment = b'x' * (4 * 1024 * 1024)
extra = b'6 0 obj\n<< /Length ' + str(len(attachment)).encode() + b' >>\nstream\n' + attachment + b'\nendstream\nendobj\n'
suffix = small[xref:].replace(b'0 6\n', b'0 7\n').replace(b'trailer\n', f'{xref:010d} 00000 n \ntrailer\n'.encode()).replace(b'/Size 6', b'/Size 7')
suffix = re.sub(rb'startxref\n\d+', b'startxref\n' + str(xref + len(extra)).encode(), suffix)
payload = small[:xref] + extra + suffix
requests, stopped = [], threading.Event()
original = StaticHandler.do_GET
def serve(handler):
if not handler.path.startswith('/range-fixture.pdf'):
return original(handler)
match = re.fullmatch(r'bytes=(\d+)-(\d*)', handler.headers.get('Range', ''))
start, end = (int(match[1]), min(int(match[2] or len(payload)-1), len(payload)-1)) if match else (0, len(payload)-1)
request = {'range': (start, end) if match else None, 'sent': 0}
requests.append(request)
handler.send_response(206 if match else 200)
handler.send_header('Content-Type', 'application/pdf')
handler.send_header('Content-Length', str(end-start+1))
handler.send_header('Accept-Ranges', 'bytes')
if match:
handler.send_header('Content-Range', f'bytes {start}-{end}/{len(payload)}')
handler.end_headers()
try:
for offset in range(start, end+1, 16384):
chunk = payload[offset:min(offset+16384, end+1)]
handler.wfile.write(chunk)
handler.wfile.flush()
request['sent'] += len(chunk)
time.sleep(.005)
except (BrokenPipeError, ConnectionResetError):
pass
finally:
if not match: stopped.set()
self.page.unroute('**/api/reader-content**')
self.page.add_init_script('''const originalFetch = window.fetch;
window.fetch = (url, init) => originalFetch(String(url).includes('/api/reader-content?') ? '/range-fixture.pdf' : url, init);''')
with patch.object(StaticHandler, 'do_GET', serve):
self.open()
self.ready()
self.assertTrue(stopped.wait(2), 'full-file transfer must be cancelled')
ranges = [item['range'] for item in requests if item['range']]
self.assertIn((0, 262143), ranges)
self.assertTrue(any(end == len(payload)-1 for _, end in ranges))
self.assertLess(sum(item['sent'] for item in requests), 1024 * 1024)
self.assertEqual(len(self.modules), 1)
def test_published_range_artifact_selects_small_chunk(self):
source = 'https://huggingface.co/datasets/vomebook/Reader-Assets/resolve/main/' \
'objects/aa/' + 'a' * 64 + '/pdf-range-v1-0123456789abcdef-objects/document.pdf'
self.page.route(MODULE, lambda route: route.fulfill(content_type='text/javascript', body='''
export const GlobalWorkerOptions = {};
export class PDFWorker { promise = Promise.resolve(); destroy() {} }
export function getDocument(options) {
window.__pdfRangeChunk = options.rangeChunkSize;
const page = {
getViewport: ({scale}) => ({width: 600 * scale, height: 800 * scale,
convertToViewportPoint: (x, y) => [x, y]}),
getTextContent: async () => ({items: []}),
render: () => ({promise: Promise.resolve()}),
};
return {promise: Promise.resolve({numPages: 1,
getPage: async () => page, getOutline: async () => null}),
destroy: () => Promise.resolve()};
}
'''))
self.page.goto(self.origin + '/static/reader.html?' + urllib.parse.urlencode(
dict(url=source, ext='pdf', title='Optimized PDF')), wait_until='domcontentloaded')
self.ready()
self.assertEqual(self.page.evaluate('() => window.__pdfRangeChunk'), 262144)
def test_first_connection_failure_recovers_with_real_pdf_engine(self):
def serve(route):
if 'reader-module-retry' not in route.request.url:
route.abort('connectionreset')
else:
route.continue_()
self.page.route(MODULE, serve)
self.open()
self.ready()
self.assertEqual(len(self.modules), 2)
self.assertIn('reader-module-retry=1', self.modules[1])
self.assertEqual(len(self.documents), 1)
def test_http_failure_recovers_on_last_attempt(self):
self.page.route(MODULE, lambda route: route.continue_()
if 'reader-module-retry=2' in route.request.url
else route.fulfill(status=503, body='temporarily unavailable'))
self.open()
self.ready()
self.assertEqual(len(self.modules), 3)
def test_exhaustion_has_bounded_requests_and_manual_reload_recovers(self):
self.page.route(MODULE, lambda route: route.abort('connectionreset'))
self.open()
self.page.locator('#reader-engine-retry').wait_for()
self.assertEqual(len(self.modules), 3)
self.assertEqual(self.documents, [])
self.assertEqual(self.page.locator('#content').get_attribute('data-error-code'), 'READER_ENGINE_NETWORK')
self.assertNotIn('Failed to fetch', self.page.locator('.reader-error').inner_text())
self.page.unroute(MODULE)
self.page.locator('#reader-engine-retry').click()
self.ready()
self.assertEqual(len(self.documents), 1)
def test_disposal_cancels_retry_backoff(self):
self.page.route(MODULE, lambda route: route.abort('connectionreset'))
self.open()
self.page.wait_for_timeout(100)
self.page.evaluate("() => window.dispatchEvent(new Event('pagehide'))")
self.page.wait_for_timeout(1800)
self.assertEqual(len(self.modules), 1)
self.assertEqual(self.documents, [])
self.assertEqual(self.errors, [])
def test_timed_out_import_cannot_start_document_after_disposal(self):
held = []
self.page.add_init_script('''const native = window.setTimeout.bind(window);
window.setTimeout = (fn, ms, ...args) => native(fn, ms === 20000 ? 50 : ms, ...args);''')
self.page.route(MODULE, lambda route: held.append(route))
self.open()
self.page.locator('#reader-engine-retry').wait_for()
self.assertEqual(len(self.modules), 3)
for route in held:
route.fulfill(content_type='text/javascript', body='''
export const GlobalWorkerOptions = {};
export function getDocument() { window.__latePdfStarted=true; throw Error('late'); }
''')
self.page.wait_for_timeout(200)
self.assertFalse(self.page.evaluate('() => !!window.__latePdfStarted'))
self.assertEqual(self.documents, [])
self.assertEqual(self.errors, [])
def test_syntax_error_is_not_retried_as_network_failure(self):
self.page.route(MODULE, lambda route: route.fulfill(content_type='text/javascript', body='export const = ;'))
self.open()
self.page.locator('.reader-error').wait_for()
self.assertEqual(len(self.modules), 1)
self.assertEqual(self.page.locator('#reader-engine-retry').count(), 0)
def test_first_http_failure_recovers_under_real_service_worker(self):
original = StaticHandler.do_GET
requests = []
def serve(handler):
if '/vendor/pdf.min.' in handler.path:
requests.append(handler.path)
if len(requests) == 1:
handler.send_error(503)
return
if handler.path == '/manifest.json' or handler.path.startswith('/icons/'):
handler.path = '/static' + handler.path
original(handler)
with patch.object(StaticHandler, 'do_GET', serve), \
self.browser.new_context(service_workers='allow') as context:
page = context.new_page()
context.route('**/api/reader-content**', lambda route: route.fulfill(
content_type='application/pdf', body=minimal_pdf()))
page.goto(self.origin + '/static/manifest.json')
page.evaluate('''async () => {
await navigator.serviceWorker.register('/static/sw.js',{scope:'/static/'});
await Promise.race([navigator.serviceWorker.ready,
new Promise((_, reject) => setTimeout(() => reject(Error('SW activation timed out')), 10000))]);
}''')
page.goto(self.origin + '/static/reader.html?' + urllib.parse.urlencode(
dict(url=SOURCE, ext='pdf', title='Cold SW retry')))
page.locator('.reader-page canvas.ready').wait_for(state='attached', timeout=15000)
self.assertTrue(page.evaluate('() => !!navigator.serviceWorker.controller'))
self.assertEqual(len(requests), 2)
self.assertIn('reader-module-retry=1', requests[1])
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