| import functools |
| from tornado.escape import url_escape |
| from tornado.httpclient import AsyncHTTPClient |
| from tornado.testing import AsyncHTTPTestCase, AsyncTestCase, LogTrapTestCase |
| from tornado.util import b |
| from tornado.web import Application, RequestHandler, asynchronous |
| |
| from tornado import gen |
| |
| class GenTest(AsyncTestCase): |
| def run_gen(self, f): |
| f() |
| self.wait() |
| |
| def delay_callback(self, iterations, callback, arg): |
| """Runs callback(arg) after a number of IOLoop iterations.""" |
| if iterations == 0: |
| callback(arg) |
| else: |
| self.io_loop.add_callback(functools.partial( |
| self.delay_callback, iterations - 1, callback, arg)) |
| |
| def test_no_yield(self): |
| @gen.engine |
| def f(): |
| self.stop() |
| self.run_gen(f) |
| |
| def test_inline_cb(self): |
| @gen.engine |
| def f(): |
| (yield gen.Callback("k1"))() |
| res = yield gen.Wait("k1") |
| assert res is None |
| self.stop() |
| self.run_gen(f) |
| |
| def test_ioloop_cb(self): |
| @gen.engine |
| def f(): |
| self.io_loop.add_callback((yield gen.Callback("k1"))) |
| yield gen.Wait("k1") |
| self.stop() |
| self.run_gen(f) |
| |
| def test_exception_phase1(self): |
| @gen.engine |
| def f(): |
| 1/0 |
| self.assertRaises(ZeroDivisionError, self.run_gen, f) |
| |
| def test_exception_phase2(self): |
| @gen.engine |
| def f(): |
| self.io_loop.add_callback((yield gen.Callback("k1"))) |
| yield gen.Wait("k1") |
| 1/0 |
| self.assertRaises(ZeroDivisionError, self.run_gen, f) |
| |
| def test_exception_in_task_phase1(self): |
| def fail_task(callback): |
| 1/0 |
| |
| @gen.engine |
| def f(): |
| try: |
| yield gen.Task(fail_task) |
| raise Exception("did not get expected exception") |
| except ZeroDivisionError: |
| self.stop() |
| self.run_gen(f) |
| |
| def test_exception_in_task_phase2(self): |
| # This is the case that requires the use of stack_context in gen.engine |
| def fail_task(callback): |
| self.io_loop.add_callback(lambda: 1/0) |
| |
| @gen.engine |
| def f(): |
| try: |
| yield gen.Task(fail_task) |
| raise Exception("did not get expected exception") |
| except ZeroDivisionError: |
| self.stop() |
| self.run_gen(f) |
| |
| def test_with_arg(self): |
| @gen.engine |
| def f(): |
| (yield gen.Callback("k1"))(42) |
| res = yield gen.Wait("k1") |
| self.assertEqual(42, res) |
| self.stop() |
| self.run_gen(f) |
| |
| def test_key_reuse(self): |
| @gen.engine |
| def f(): |
| yield gen.Callback("k1") |
| yield gen.Callback("k1") |
| self.stop() |
| self.assertRaises(gen.KeyReuseError, self.run_gen, f) |
| |
| def test_key_mismatch(self): |
| @gen.engine |
| def f(): |
| yield gen.Callback("k1") |
| yield gen.Wait("k2") |
| self.stop() |
| self.assertRaises(gen.UnknownKeyError, self.run_gen, f) |
| |
| def test_leaked_callback(self): |
| @gen.engine |
| def f(): |
| yield gen.Callback("k1") |
| self.stop() |
| self.assertRaises(gen.LeakedCallbackError, self.run_gen, f) |
| |
| def test_parallel_callback(self): |
| @gen.engine |
| def f(): |
| for k in range(3): |
| self.io_loop.add_callback((yield gen.Callback(k))) |
| yield gen.Wait(1) |
| self.io_loop.add_callback((yield gen.Callback(3))) |
| yield gen.Wait(0) |
| yield gen.Wait(3) |
| yield gen.Wait(2) |
| self.stop() |
| self.run_gen(f) |
| |
| def test_bogus_yield(self): |
| @gen.engine |
| def f(): |
| yield 42 |
| self.assertRaises(gen.BadYieldError, self.run_gen, f) |
| |
| def test_reuse(self): |
| @gen.engine |
| def f(): |
| self.io_loop.add_callback((yield gen.Callback(0))) |
| yield gen.Wait(0) |
| self.stop() |
| self.run_gen(f) |
| self.run_gen(f) |
| |
| def test_task(self): |
| @gen.engine |
| def f(): |
| yield gen.Task(self.io_loop.add_callback) |
| self.stop() |
| self.run_gen(f) |
| |
| def test_wait_all(self): |
| @gen.engine |
| def f(): |
| (yield gen.Callback("k1"))("v1") |
| (yield gen.Callback("k2"))("v2") |
| results = yield gen.WaitAll(["k1", "k2"]) |
| self.assertEqual(results, ["v1", "v2"]) |
| self.stop() |
| self.run_gen(f) |
| |
| def test_exception_in_yield(self): |
| @gen.engine |
| def f(): |
| try: |
| yield gen.Wait("k1") |
| raise "did not get expected exception" |
| except gen.UnknownKeyError: |
| pass |
| self.stop() |
| self.run_gen(f) |
| |
| def test_resume_after_exception_in_yield(self): |
| @gen.engine |
| def f(): |
| try: |
| yield gen.Wait("k1") |
| raise "did not get expected exception" |
| except gen.UnknownKeyError: |
| pass |
| (yield gen.Callback("k2"))("v2") |
| self.assertEqual((yield gen.Wait("k2")), "v2") |
| self.stop() |
| self.run_gen(f) |
| |
| def test_orphaned_callback(self): |
| @gen.engine |
| def f(): |
| self.orphaned_callback = yield gen.Callback(1) |
| try: |
| self.run_gen(f) |
| raise "did not get expected exception" |
| except gen.LeakedCallbackError: |
| pass |
| self.orphaned_callback() |
| |
| def test_multi(self): |
| @gen.engine |
| def f(): |
| (yield gen.Callback("k1"))("v1") |
| (yield gen.Callback("k2"))("v2") |
| results = yield [gen.Wait("k1"), gen.Wait("k2")] |
| self.assertEqual(results, ["v1", "v2"]) |
| self.stop() |
| self.run_gen(f) |
| |
| def test_multi_delayed(self): |
| @gen.engine |
| def f(): |
| # callbacks run at different times |
| responses = yield [ |
| gen.Task(self.delay_callback, 3, arg="v1"), |
| gen.Task(self.delay_callback, 1, arg="v2"), |
| ] |
| self.assertEqual(responses, ["v1", "v2"]) |
| self.stop() |
| self.run_gen(f) |
| |
| def test_arguments(self): |
| @gen.engine |
| def f(): |
| (yield gen.Callback("noargs"))() |
| self.assertEqual((yield gen.Wait("noargs")), None) |
| (yield gen.Callback("1arg"))(42) |
| self.assertEqual((yield gen.Wait("1arg")), 42) |
| |
| (yield gen.Callback("kwargs"))(value=42) |
| result = yield gen.Wait("kwargs") |
| self.assertTrue(isinstance(result, gen.Arguments)) |
| self.assertEqual(((), dict(value=42)), result) |
| self.assertEqual(dict(value=42), result.kwargs) |
| |
| (yield gen.Callback("2args"))(42, 43) |
| result = yield gen.Wait("2args") |
| self.assertTrue(isinstance(result, gen.Arguments)) |
| self.assertEqual(((42, 43), {}), result) |
| self.assertEqual((42, 43), result.args) |
| |
| def task_func(callback): |
| callback(None, error="foo") |
| result = yield gen.Task(task_func) |
| self.assertTrue(isinstance(result, gen.Arguments)) |
| self.assertEqual(((None,), dict(error="foo")), result) |
| |
| self.stop() |
| self.run_gen(f) |
| |
| |
| class GenSequenceHandler(RequestHandler): |
| @asynchronous |
| @gen.engine |
| def get(self): |
| self.io_loop = self.request.connection.stream.io_loop |
| self.io_loop.add_callback((yield gen.Callback("k1"))) |
| yield gen.Wait("k1") |
| self.write("1") |
| self.io_loop.add_callback((yield gen.Callback("k2"))) |
| yield gen.Wait("k2") |
| self.write("2") |
| # reuse an old key |
| self.io_loop.add_callback((yield gen.Callback("k1"))) |
| yield gen.Wait("k1") |
| self.finish("3") |
| |
| class GenTaskHandler(RequestHandler): |
| @asynchronous |
| @gen.engine |
| def get(self): |
| io_loop = self.request.connection.stream.io_loop |
| client = AsyncHTTPClient(io_loop=io_loop) |
| response = yield gen.Task(client.fetch, self.get_argument('url')) |
| response.rethrow() |
| self.finish(b("got response: ") + response.body) |
| |
| class GenExceptionHandler(RequestHandler): |
| @asynchronous |
| @gen.engine |
| def get(self): |
| # This test depends on the order of the two decorators. |
| io_loop = self.request.connection.stream.io_loop |
| yield gen.Task(io_loop.add_callback) |
| raise Exception("oops") |
| |
| class GenYieldExceptionHandler(RequestHandler): |
| @asynchronous |
| @gen.engine |
| def get(self): |
| io_loop = self.request.connection.stream.io_loop |
| # Test the interaction of the two stack_contexts. |
| def fail_task(callback): |
| io_loop.add_callback(lambda: 1/0) |
| try: |
| yield gen.Task(fail_task) |
| raise Exception("did not get expected exception") |
| except ZeroDivisionError: |
| self.finish('ok') |
| |
| class GenWebTest(AsyncHTTPTestCase, LogTrapTestCase): |
| def get_app(self): |
| return Application([ |
| ('/sequence', GenSequenceHandler), |
| ('/task', GenTaskHandler), |
| ('/exception', GenExceptionHandler), |
| ('/yield_exception', GenYieldExceptionHandler), |
| ]) |
| |
| def test_sequence_handler(self): |
| response = self.fetch('/sequence') |
| self.assertEqual(response.body, b("123")) |
| |
| def test_task_handler(self): |
| response = self.fetch('/task?url=%s' % url_escape(self.get_url('/sequence'))) |
| self.assertEqual(response.body, b("got response: 123")) |
| |
| def test_exception_handler(self): |
| # Make sure we get an error and not a timeout |
| response = self.fetch('/exception') |
| self.assertEqual(500, response.code) |
| |
| def test_yield_exception_handler(self): |
| response = self.fetch('/yield_exception') |
| self.assertEqual(response.body, b('ok')) |
