author | Daniel Diniz <ajaksu@gmail.com> |
Thu, 02 Jul 2009 18:33:13 +0200 | |
changeset 2495 | 0113c2de89d3 |
parent 149 | f2e327a7c5de |
permissions | -rwxr-xr-x |
149
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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"""Serve static files from a zipfile. |
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This is a solution for apps that want to serve 1000s of small static |
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files while staying withing the 1000 file limit. |
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The simplest use case is driven purely from the handlers section in |
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app.yaml, e.g.: |
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- url: /images/.* |
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script: $PYTHON_LIB/google/appengine/ext/zipserve |
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This would invoke a main() within zipserve/__init__.py. This code |
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would then take the URL path, and look for a .zip file under the first |
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component of the path, in this case "images.zip" in the app's working |
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directory. If found, it will then serve any matching paths below that |
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from the zip file. In other words, /images/foo/icon.gif would map to |
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foo/icon.gif in the zip file images.zip. |
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You can also customize the behavior by adding a custom line to your |
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WSGIApplication() invocation: |
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def main(): |
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app = webapp.WSGIApplication( |
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[('/', MainPage), |
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('/static/(.*)', zipserve.make_zip_handler('staticfiles.zip')), |
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]) |
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You can pass max_age=N to the make_zip_handler() call to override the |
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expiration time in seconds, which defaults to 600. |
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To customize the behavior even more, you can subclass ZipHandler and |
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override the get() method, or override it and call ServeFromZipFile() |
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directly. |
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Note that by default, a Cache-control is added that makes these pages |
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cacheable even if they require authentication. If this is not what |
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you want, override ZipHandler.SetCachingHeaders(). |
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""" |
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import email.Utils |
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import logging |
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import mimetypes |
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import time |
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import zipfile |
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from google.appengine.ext import webapp |
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from google.appengine.ext.webapp import util |
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def make_zip_handler(zipfilename, max_age=None, public=None): |
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"""Factory function to construct a custom ZipHandler instance. |
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Args: |
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zipfilename: The filename of a zipfile. |
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max_age: Optional expiration time; defaults to ZipHandler.MAX_AGE. |
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public: Optional public flag; defaults to ZipHandler.PUBLIC. |
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Returns: |
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A ZipHandler subclass. |
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""" |
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class CustomZipHandler(ZipHandler): |
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def get(self, name): |
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self.ServeFromZipFile(self.ZIPFILENAME, name) |
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ZIPFILENAME = zipfilename |
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if max_age is not None: |
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MAX_AGE = max_age |
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if public is not None: |
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PUBLIC = public |
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return CustomZipHandler |
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class ZipHandler(webapp.RequestHandler): |
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"""Request handler serving static files from zipfiles.""" |
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zipfile_cache = {} |
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def get(self, prefix, name): |
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"""GET request handler. |
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Typically the arguments are passed from the matching groups in the |
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URL pattern passed to WSGIApplication(). |
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Args: |
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prefix: The zipfilename without the .zip suffix. |
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name: The name within the zipfile. |
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""" |
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self.ServeFromZipFile(prefix + '.zip', name) |
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def ServeFromZipFile(self, zipfilename, name): |
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"""Helper for the GET request handler. |
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This serves the contents of file 'name' from zipfile |
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112 |
'zipfilename', logging a message and returning a 404 response if |
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113 |
either the zipfile cannot be opened or the named file cannot be |
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114 |
read from it. |
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115 |
|
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116 |
Args: |
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117 |
zipfilename: The name of the zipfile. |
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118 |
name: The name within the zipfile. |
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119 |
""" |
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zipfile_object = self.zipfile_cache.get(zipfilename) |
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121 |
if zipfile_object is None: |
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122 |
try: |
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123 |
zipfile_object = zipfile.ZipFile(zipfilename) |
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124 |
except (IOError, RuntimeError), err: |
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125 |
logging.error('Can\'t open zipfile %s: %s', zipfilename, err) |
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126 |
zipfile_object = '' |
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127 |
self.zipfile_cache[zipfilename] = zipfile_object |
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128 |
if zipfile_object == '': |
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129 |
self.error(404) |
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130 |
self.response.out.write('Not found') |
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131 |
return |
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132 |
try: |
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133 |
data = zipfile_object.read(name) |
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134 |
except (KeyError, RuntimeError), err: |
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self.error(404) |
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136 |
self.response.out.write('Not found') |
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137 |
return |
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138 |
content_type, encoding = mimetypes.guess_type(name) |
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139 |
if content_type: |
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140 |
self.response.headers['Content-Type'] = content_type |
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141 |
self.SetCachingHeaders() |
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142 |
self.response.out.write(data) |
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143 |
|
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144 |
MAX_AGE = 600 |
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145 |
|
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146 |
PUBLIC = True |
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147 |
|
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148 |
def SetCachingHeaders(self): |
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149 |
"""Helper to set the caching headers. |
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150 |
|
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151 |
Override this to customize the headers beyond setting MAX_AGE. |
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152 |
""" |
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153 |
max_age = self.MAX_AGE |
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154 |
self.response.headers['Expires'] = email.Utils.formatdate( |
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155 |
time.time() + max_age, usegmt=True) |
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156 |
cache_control = [] |
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157 |
if self.PUBLIC: |
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158 |
cache_control.append('public') |
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159 |
cache_control.append('max-age=%d' % max_age) |
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160 |
self.response.headers['Cache-Control'] = ', '.join(cache_control) |
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161 |
|
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162 |
|
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163 |
def main(): |
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164 |
"""Main program. |
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165 |
|
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166 |
This is invoked when this package is referenced from app.yaml. |
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167 |
""" |
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168 |
application = webapp.WSGIApplication([('/([^/]+)/(.*)', ZipHandler)]) |
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169 |
util.run_wsgi_app(application) |
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170 |
|
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171 |
|
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172 |
if __name__ == '__main__': |
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173 |
main() |