Mercurial > piecrust2

annotate piecrust/serving/wrappers.py @ 1059:292e3a1316d8

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serve: Fix crash when editing `config.yml` while serving.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 13 Feb 2018 11:11:48 -0800
parents 7ecb946bfafd
children 137c9b41edd2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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5
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6 logger = logging.getLogger(__name__)
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8
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9 def run_piecrust_server(wsgi, appfactory, host, port,
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10 is_cmdline_mode=False,
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11 serve_admin=False,
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12 use_debugger=False,
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13 use_reloader=False):
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14
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15 if wsgi == 'werkzeug':
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16 _run_werkzeug_server(appfactory, host, port,
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17 is_cmdline_mode=is_cmdline_mode,
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18 serve_admin=serve_admin,
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19 use_debugger=use_debugger,
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20 use_reloader=use_reloader)
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21
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22 elif wsgi == 'gunicorn':
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23 options = {
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24 'bind': '%s:%s' % (host, port),
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25 'accesslog': '-', # print access log to stderr
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26 }
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27 if use_debugger:
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28 options['loglevel'] = 'debug'
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29 if use_reloader:
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30 options['reload'] = True
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31 _run_gunicorn_server(appfactory,
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32 is_cmdline_mode=is_cmdline_mode,
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33 gunicorn_options=options)
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34
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35 else:
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36 raise Exception("Unknown WSGI server: %s" % wsgi)
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37
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38
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39 def _run_werkzeug_server(appfactory, host, port, *,
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40 is_cmdline_mode=False,
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41 serve_admin=False,
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42 use_debugger=False,
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43 use_reloader=False):
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44 from werkzeug.serving import run_simple
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45
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46 def _run_sse_check():
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47 # We don't want to run the processing loop here if this isn't
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48 # the actual process that does the serving. In most cases it is,
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49 # but if we're using Werkzeug's reloader, then it won't be the
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50 # first time we get there... it will only be the correct process
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51 # the second time, when the reloading process is spawned, with the
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52 # `WERKZEUG_RUN_MAIN` variable set.
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53 return (not use_reloader or
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54 os.environ.get('WERKZEUG_RUN_MAIN') == 'true')
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55
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56 app = _get_piecrust_server(appfactory,
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57 is_cmdline_mode=is_cmdline_mode,
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58 serve_site=True,
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59 serve_admin=serve_admin,
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60 run_sse_check=_run_sse_check)
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61
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62 # We need to do a few things to get Werkzeug to properly shutdown or
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63 # restart while SSE responses are running. This is because Werkzeug runs
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64 # them in background threads (because we tell it to), but those threads
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65 # are not marked as "daemon", so when the main thread tries to exit, it
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66 # will wait on those SSE responses to end, which will pretty much never
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67 # happen (except for a timeout or the user closing their browser).
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68 #
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69 # In theory we should be using a proper async server for this kind of
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70 # stuff, but I'd rather avoid additional dependencies on stuff that's not
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71 # necessarily super portable.
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72 #
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73 # Anyway, we run the server as usual, but we intercept the `SIGINT`
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74 # signal for when the user presses `CTRL-C`. When that happens, we set a
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75 # flag that will make all existing SSE loops return, which will make it
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76 # possible for the main thread to end too.
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77 #
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78 # We also need to do a few thing for the "reloading" feature in Werkzeug,
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79 # see the comment down there for more info.
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80 def _shutdown_server():
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81 from piecrust.serving import procloop
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82 procloop.server_shutdown = True
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83
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84 if serve_admin:
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85 from piecrust.admin import pubutil
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86 pubutil.server_shutdown = True
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87
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88 def _shutdown_server_and_raise_sigint():
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89 if not use_reloader or os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
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90 # We only need to shutdown the SSE requests for the process
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91 # that actually runs them.
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92 print("")
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93 print("Shutting server down...")
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94 _shutdown_server()
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95 raise KeyboardInterrupt()
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96
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97 signal.signal(signal.SIGINT,
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98 lambda *args: _shutdown_server_and_raise_sigint())
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99
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100 # Disable debugger PIN protection.
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101 os.environ['WERKZEUG_DEBUG_PIN'] = 'off'
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102
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103 try:
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104 run_simple(host, port, app,
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105 threaded=True,
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106 use_debugger=use_debugger,
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107 use_reloader=use_reloader)
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108 except SystemExit:
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109 if os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
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110 # When using the reloader, if code has changed, the child process
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111 # will use `sys.exit` to end and let the master process restart
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112 # it... we need to shutdown the SSE requests otherwise it will
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113 # not exit.
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114 _shutdown_server()
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115 raise
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116
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117
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118 def _run_gunicorn_server(appfactory,
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119 is_cmdline_mode=False,
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120 gunicorn_options=None):
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121 from gunicorn.app.base import BaseApplication
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122
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123 class PieCrustGunicornApplication(BaseApplication):
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124 def __init__(self, app, options):
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125 self.app = app
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126 self.options = options
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127 super(PieCrustGunicornApplication, self).__init__()
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128
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129 def load_config(self):
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130 for k, v in self.options.items():
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131 if k in self.cfg.settings and v is not None:
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132 self.cfg.set(k, v)
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133
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134 def load(self):
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135 return self.app
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136
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137 app = _get_piecrust_server(appfactory,
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138 is_cmdline_mode=is_cmdline_mode)
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139
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140 gunicorn_options = gunicorn_options or {}
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141 app_wrapper = PieCrustGunicornApplication(app, gunicorn_options)
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142 app_wrapper.run()
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143
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144
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145 def get_piecrust_server(root_dir, *,
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146 debug=False,
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147 cache_key=None,
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148 serve_site=True,
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149 serve_admin=False,
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150 is_cmdline_mode=False):
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151 from piecrust.app import PieCrustFactory
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152 appfactory = PieCrustFactory(root_dir,
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153 debug=debug,
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154 cache_key=cache_key)
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155 return _get_piecrust_server(appfactory,
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156 serve_site=serve_site,
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157 serve_admin=serve_admin,
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158 is_cmdline_mode=is_cmdline_mode)
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159
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160
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161 def _get_piecrust_server(appfactory, *,
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162 serve_site=True,
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163 serve_admin=False,
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164 is_cmdline_mode=False,
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165 admin_root_url=None,
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166 run_sse_check=None):
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167 app = None
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168
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169 if serve_site:
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170 from piecrust.serving.middlewares import (
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171 PieCrustStaticResourcesMiddleware, PieCrustDebugMiddleware)
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172 from piecrust.serving.server import PieCrustServer
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173
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174 app = PieCrustServer(appfactory)
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175 app = PieCrustStaticResourcesMiddleware(app)
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176
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177 if is_cmdline_mode:
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178 app = PieCrustDebugMiddleware(
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179 app, appfactory, run_sse_check=run_sse_check)
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180
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181 if serve_admin:
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182 from piecrust.admin.web import create_foodtruck_app
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183
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184 es = {
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185 'FOODTRUCK_CMDLINE_MODE': is_cmdline_mode,
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186 'FOODTRUCK_ROOT_DIR': appfactory.root_dir,
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187 'FOODTRUCK_ROOT_URL': admin_root_url,
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188 'DEBUG': appfactory.debug}
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189 if is_cmdline_mode:
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190 es.update({
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191 'SECRET_KEY': os.urandom(22),
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192 'LOGIN_DISABLED': True})
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193
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194 if appfactory.debug and is_cmdline_mode:
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195 # Disable PIN protection with Werkzeug's debugger.
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196 os.environ['WERKZEUG_DEBUG_PIN'] = 'off'
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197
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198 admin_app = create_foodtruck_app(es, url_prefix=admin_root_url)
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199 if app is not None:
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200 admin_app.wsgi_app = _PieCrustSiteOrAdminMiddleware(
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201 app, admin_app.wsgi_app, admin_root_url)
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202
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203 app = admin_app
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204
374
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205 return app
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206
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207
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208 class _PieCrustSiteOrAdminMiddleware:
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209 def __init__(self, main_app, admin_app, admin_root_url):
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210 from werkzeug.exceptions import abort
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211
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212 def _err_resp(e, sr):
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213 abort(404)
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214
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215 self.main_app = main_app
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216 self.admin_app = admin_app or _err_resp
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217 self.admin_root_url = admin_root_url
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218
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219 def __call__(self, environ, start_response):
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220 path_info = environ.get('PATH_INFO', '')
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221 if path_info.startswith(self.admin_root_url):
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222 return self.admin_app(environ, start_response)
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223 return self.main_app(environ, start_response)
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224
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225
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226 class _PieCrustAdminScriptNamePatcherMiddleware:
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227 def __init__(self, admin_app, admin_root_url):
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228 self.admin_app = admin_app
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229 self.admin_root_url = '/%s' % admin_root_url.strip('/')
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230
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231 def __call__(self, environ, start_response):
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232 environ['SCRIPT_NAME'] = self.admin_root_url
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233 return self.admin_app(environ, start_response)