Mercurial > piecrust2

annotate piecrust/serving/wrappers.py @ 663:3ceeca7bb71c

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themes: Add support for a `--theme` argument to `chef`.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 01 Mar 2016 22:27:28 -0800
parents 9ab005db2592
children 81d9c3a3a0b5
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1 import os
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2 import signal
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3 import logging
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4 import threading
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5 import urllib.request
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6
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7
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8 logger = logging.getLogger(__name__)
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11 def run_werkzeug_server(root_dir, host, port,
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12 debug_piecrust=False, theme_site=False,
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13 sub_cache_dir=None,
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14 use_debugger=False, use_reloader=False):
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15 from werkzeug.serving import run_simple
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16
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17 def _run_sse_check():
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18 # We don't want to run the processing loop here if this isn't
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19 # the actual process that does the serving. In most cases it is,
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20 # but if we're using Werkzeug's reloader, then it won't be the
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21 # first time we get there... it will only be the correct process
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22 # the second time, when the reloading process is spawned, with the
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23 # `WERKZEUG_RUN_MAIN` variable set.
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24 return (not use_reloader or
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25 os.environ.get('WERKZEUG_RUN_MAIN') == 'true')
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26
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27 app = _get_piecrust_server(root_dir,
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28 debug=debug_piecrust,
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29 theme_site=theme_site,
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30 sub_cache_dir=sub_cache_dir,
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31 run_sse_check=_run_sse_check)
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32
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33 # We need to do a few things to get Werkzeug to properly shutdown or
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34 # restart while SSE responses are running. This is because Werkzeug runs
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35 # them in background threads (because we tell it to), but those threads
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36 # are not marked as "daemon", so when the main thread tries to exit, it
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37 # will wait on those SSE responses to end, which will pretty much never
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38 # happen (except for a timeout or the user closing their browser).
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39 #
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40 # In theory we should be using a proper async server for this kind of
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41 # stuff, but I'd rather avoid additional dependencies on stuff that's not
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42 # necessarily super portable.
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43 #
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44 # Anyway, we run the server as usual, but we intercept the `SIGINT`
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45 # signal for when the user presses `CTRL-C`. When that happens, we set a
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46 # flag that will make all existing SSE loops return, which will make it
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47 # possible for the main thread to end too.
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48 #
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49 # We also need to do a few thing for the "reloading" feature in Werkzeug,
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50 # see the comment down there for more info.
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51 def _shutdown_server():
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52 from piecrust.serving import procloop
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53 procloop.server_shutdown = True
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54
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55 def _shutdown_server_and_raise_sigint():
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56 if not use_reloader or os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
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57 # We only need to shutdown the SSE requests for the process
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58 # that actually runs them.
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59 print("")
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60 print("Shutting server down...")
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61 _shutdown_server()
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62 raise KeyboardInterrupt()
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63
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64 signal.signal(signal.SIGINT,
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65 lambda *args: _shutdown_server_and_raise_sigint())
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66
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67 try:
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68 run_simple(host, port, app,
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69 threaded=True,
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70 use_debugger=use_debugger,
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71 use_reloader=use_reloader)
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72 except SystemExit:
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73 if os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
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74 # When using the reloader, if code has changed, the child process
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75 # will use `sys.exit` to end and let the master process restart
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76 # it... we need to shutdown the SSE requests otherwise it will
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77 # not exit.
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78 _shutdown_server()
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79 raise
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80
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81
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82 def run_gunicorn_server(root_dir,
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83 debug_piecrust=False, theme_site=False,
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84 sub_cache_dir=None,
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85 gunicorn_options=None):
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86 from gunicorn.app.base import BaseApplication
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87
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88 class PieCrustGunicornApplication(BaseApplication):
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89 def __init__(self, app, options):
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90 self.app = app
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91 self.options = options
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92 super(PieCrustGunicornApplication, self).__init__()
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93
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94 def load_config(self):
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95 for k, v in self.options.items():
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96 if k in self.cfg.settings and v is not None:
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97 self.cfg.set(k, v)
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98
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99 def load(self):
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100 return self.app
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101
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102 app = _get_piecrust_server(root_dir,
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103 debug=debug_piecrust,
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104 theme_site=theme_site,
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105 sub_cache_dir=sub_cache_dir)
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106
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107 gunicorn_options = gunicorn_options or {}
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108 app_wrapper = PieCrustGunicornApplication(app, gunicorn_options)
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109 app_wrapper.run()
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110
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111
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112 def _get_piecrust_server(
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113 root_dir, debug=False, theme_site=False,
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114 sub_cache_dir=None, run_sse_check=None):
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115 from piecrust.serving.middlewares import (
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116 StaticResourcesMiddleware, PieCrustDebugMiddleware)
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117 from piecrust.serving.server import WsgiServer
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118 app = WsgiServer(root_dir, debug=debug, theme_site=theme_site,
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119 sub_cache_dir=sub_cache_dir)
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120 app = StaticResourcesMiddleware(app)
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121 app = PieCrustDebugMiddleware(app, root_dir,
663
3ceeca7bb71c themes: Add support for a `--theme` argument to `chef`.
Ludovic Chabant <ludovic@chabant.com>
parents: 558
diff changeset
122 theme_site=theme_site,
553
cc6f3dbe3048 serve: Extract some of the server's functionality into WSGI middlewares.
Ludovic Chabant <ludovic@chabant.com>
parents: 552
diff changeset
123 sub_cache_dir=sub_cache_dir,
cc6f3dbe3048 serve: Extract some of the server's functionality into WSGI middlewares.
Ludovic Chabant <ludovic@chabant.com>
parents: 552
diff changeset
124 run_sse_check=run_sse_check)
374
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
125 return app
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
126