Mercurial > p > roundup > code
annotate test/wsgi_liveserver.py @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
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| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | e9760702bf0c |
| children | f6923d2ba9a5 |
| rev | line source |
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1 # -*- coding: utf-8 -*- |
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2 """ |
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3 wsgi-liveserver provides a simple LiverServerTestCase class that can be used to |
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4 help start a web server in the background to serve a WSGI compliant application |
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5 for use with testing. Generally it will be used in conjuction with something |
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6 like Selenium to perform a series of functional tests using a browser. |
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7 |
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8 Licensed under the GNU GPL v3 |
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9 |
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10 Copyright (c) 2013 John Kristensen (unless explicitly stated otherwise). |
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11 """ |
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12 import threading |
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13 import socket |
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14 import unittest |
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15 from wsgiref.simple_server import make_server, WSGIRequestHandler |
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16 |
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17 __author__ = 'John Kristensen' |
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18 __version__ = '0.3.1' |
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19 __license__ = 'GPLv3' |
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20 |
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21 |
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22 class QuietHandler(WSGIRequestHandler): |
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23 def log_request(*args, **kwargs): |
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24 pass |
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25 |
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26 |
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27 class LiveServerTestCase(unittest.TestCase): |
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28 |
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29 port_range = (8080, 8090) |
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30 |
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31 def create_app(self): |
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32 """Create your wsgi app and return it.""" |
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33 raise NotImplementedError |
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34 |
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35 def __call__(self, result=None): |
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36 """ |
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37 Do some custom setup stuff and then hand off to TestCase to do its |
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38 thing. |
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39 """ |
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40 try: |
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41 self._pre_setup() |
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42 super(LiveServerTestCase, self).__call__(result) |
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43 finally: |
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44 self._post_teardown() |
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45 |
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46 def url_base(self): |
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47 """Return the url of the test server.""" |
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48 return 'http://{0}:{1}'.format(self.host, self.port) |
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49 |
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50 def _pre_setup(self): |
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51 """Setup and start the test server in the background.""" |
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52 self._server = None |
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53 |
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54 self.host = 'localhost' |
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55 self.port = self.port_range[0] |
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56 self._thread = None |
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57 |
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58 # Get the app |
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59 self.app = self.create_app() |
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60 |
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61 # Cycle through the port range to find a free port |
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62 while self._server is None and self.port <= self.port_range[1]: |
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63 try: |
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64 self._server = make_server(self.host, self.port, self.app, |
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65 handler_class=QuietHandler) |
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66 except socket.error: |
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67 self.port += 1 |
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68 |
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69 # No free port, raise an exception |
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70 if self._server is None: |
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71 raise socket.error('Ports {0}-{1} are all already in use'.format( |
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72 *self.port_range)) |
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73 |
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74 # Start the test server in the background |
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75 self._thread = threading.Thread(target=self._server.serve_forever) |
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76 self._thread.start() |
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77 |
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78 def _post_teardown(self): |
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79 """Stop the test server.""" |
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80 if self._thread is not None: |
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81 self._server.shutdown() |
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82 self._server.server_close() |
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83 self._thread.join() |
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84 del self._server |
