Simplify waiting for notebook server to die.

IPython/html/tests/launchnotebook.py

@@ -1,96 +1,92 b''
 """Base class for notebook tests."""
 
 import sys
 import time
 import requests
 from contextlib import contextmanager
 from subprocess import Popen, STDOUT
 from unittest import TestCase
 
 import nose
 
 from IPython.utils.tempdir import TemporaryDirectory
 
 class NotebookTestBase(TestCase):
     """A base class for tests that need a running notebook.
     
     This creates an empty profile in a temp ipython_dir
     and then starts the notebook server with a separate temp notebook_dir.
     """
 
     port = 12341
 
     @classmethod
     def wait_until_alive(cls):
         """Wait for the server to be alive"""
         url = 'http://localhost:%i/api/notebooks' % cls.port
         for _ in range(300):
             try:
                 requests.get(url)
             except requests.exceptions.ConnectionError:
                 if cls.notebook.poll() is not None:
                     raise RuntimeError("The notebook server exited with status %s" \
                                         % cls.notebook.poll())
                 time.sleep(.1)
             else:
                 return
 
         raise TimeoutError("The notebook server didn't start up correctly.")
     
     @classmethod
     def wait_until_dead(cls):
-        """Wait for the server to stop getting requests after shutdown"""
-        url = 'http://localhost:%i/api/notebooks' % cls.port
+        """Wait for the server process to terminate after shutdown"""
         for _ in range(300):
-            try:
-                requests.get(url)
-            except requests.exceptions.ConnectionError:
-                break
-            else:
+            if cls.notebook.poll() is not None:
+                return
                 time.sleep(.1)
     
         raise TimeoutError("Undead notebook server")
 
     @classmethod
     def setup_class(cls):
         cls.ipython_dir = TemporaryDirectory()
         cls.notebook_dir = TemporaryDirectory()
         notebook_args = [
             sys.executable, '-c',
             'from IPython.html.notebookapp import launch_new_instance; launch_new_instance()',
             '--port=%d' % cls.port,
             '--port-retries=0',
             '--no-browser',
             '--ipython-dir=%s' % cls.ipython_dir.name,
             '--notebook-dir=%s' % cls.notebook_dir.name,
         ]
         cls.notebook = Popen(notebook_args,
             stdout=nose.iptest_stdstreams_fileno(),
             stderr=STDOUT,
         )
         cls.wait_until_alive()
 
     @classmethod
     def teardown_class(cls):
         cls.notebook.terminate()
         cls.ipython_dir.cleanup()
         cls.notebook_dir.cleanup()
         cls.wait_until_dead()
 
     @classmethod
     def base_url(cls):
         return 'http://localhost:%i/' % cls.port
 
 
 @contextmanager
 def assert_http_error(status, msg=None):
     try:
         yield
     except requests.HTTPError as e:
         real_status = e.response.status_code
         assert real_status == status, \
                     "Expected status %d, got %d" % (real_status, status)
         if msg:
             assert msg in str(e), e
     else:
         assert False, "Expected HTTP error status"
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