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annotate piecrust/serving.py @ 110:7f00176a3b4d

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Prepare the server to support background asset pipelines.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 16 Oct 2014 08:19:02 -0700
parents 73956224eb67
children 208c652551a3
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1 import re
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2 import gzip
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3 import time
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4 import os
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5 import os.path
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6 import hashlib
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7 import logging
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8 import io
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9 from werkzeug.exceptions import (NotFound, MethodNotAllowed,
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10 InternalServerError)
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11 from werkzeug.serving import run_simple
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12 from werkzeug.wrappers import Request, Response
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13 from werkzeug.wsgi import wrap_file
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14 from jinja2 import FileSystemLoader, Environment
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15 from piecrust.app import PieCrust
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16 from piecrust.data.filters import (PaginationFilter, HasFilterClause,
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17 IsFilterClause)
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18 from piecrust.page import Page
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19 from piecrust.processing.base import ProcessorPipeline
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20 from piecrust.rendering import PageRenderingContext, render_page
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21 from piecrust.sources.base import PageFactory, MODE_PARSING
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22
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23
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24 logger = logging.getLogger(__name__)
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25
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26
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27 class Server(object):
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28 def __init__(self, root_dir, host='localhost', port='8080',
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29 debug=False, static_preview=True,
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30 synchronous_asset_pipeline=True):
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31 self.root_dir = root_dir
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32 self.host = host
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33 self.port = port
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34 self.debug = debug
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35 self.static_preview = static_preview
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36 self.synchronous_asset_pipeline = synchronous_asset_pipeline
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37 self._out_dir = None
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38 self._skip_patterns = None
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39 self._force_patterns = None
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40 self._record = None
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41 self._mimetype_map = load_mimetype_map()
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42
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43 def run(self):
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44 # Bake all the assets so we know what we have, and so we can serve
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45 # them to the client. We need a temp app for this.
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46 app = PieCrust(root_dir=self.root_dir, debug=self.debug)
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47 mounts = app.assets_dirs
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48 self._out_dir = os.path.join(app.cache_dir, 'server')
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49 self._skip_patterns = app.config.get('baker/skip_patterns')
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50 self._force_patterns = app.config.get('baker/force_patterns')
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51 pipeline = ProcessorPipeline(
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52 app, mounts, self._out_dir,
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53 skip_patterns=self._skip_patterns,
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54 force_patterns=self._force_patterns)
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55 self._record = pipeline.run()
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56
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57 # Run the WSGI app.
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58 wsgi_wrapper = WsgiServer(self)
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59 run_simple(self.host, self.port, wsgi_wrapper,
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60 use_debugger=True, use_reloader=True)
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61
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62 def _run_request(self, environ, start_response):
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63 try:
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64 return self._run_piecrust(environ, start_response)
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65 except Exception as ex:
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66 if self.debug:
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67 raise
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68 return self._handle_error(ex, environ, start_response)
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69
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70 def _run_piecrust(self, environ, start_response):
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71 request = Request(environ)
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72
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73 # We don't support anything else than GET requests since we're
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74 # previewing something that will be static later.
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75 if self.static_preview and request.method != 'GET':
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76 logger.error("Only GET requests are allowed, got %s" % request.method)
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77 raise MethodNotAllowed()
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78
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79 # Create the app for this request.
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80 app = PieCrust(root_dir=self.root_dir, debug=self.debug)
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81 app.config.set('site/root', '/')
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82 app.config.set('site/pretty_urls', True)
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83 app.config.set('server/is_serving', True)
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84
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85 # We'll serve page assets directly from where they are.
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86 app.env.base_asset_url_format = '/_asset/%path%'
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87
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88 # See if the requested URL is an asset.
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89 response = self._try_serve_asset(app, environ, request)
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90 if response is not None:
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91 return response(environ, start_response)
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92
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93 # It's not an asset we know of... let's see if it can be a page asset.
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94 response = self._try_serve_page_asset(app, environ, request)
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95 if response is not None:
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96 return response(environ, start_response)
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97
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98 # Nope. Let's hope it's an actual page.
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99 try:
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100 response = self._try_serve_page(app, environ, request)
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101 return response(environ, start_response)
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102 except (RouteNotFoundError, SourceNotFoundError) as ex:
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103 logger.exception(ex)
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104 raise NotFound()
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105 except Exception as ex:
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106 logger.exception(ex)
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107 if app.debug:
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108 raise
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109 raise InternalServerError()
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110
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111 def _try_serve_asset(self, app, environ, request):
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112 logger.debug("Searching for asset with path: %s" % request.path)
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113 rel_req_path = request.path.lstrip('/').replace('/', os.sep)
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114 entry = self._record.findEntry(rel_req_path)
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115 if entry is None:
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116 return None
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117
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118 # Yep, we know about this URL because we processed an asset that
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119 # maps to it... make sure it's up to date by re-processing it
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120 # before serving.
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121 mounts = app.assets_dirs
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122 asset_in_path = entry.path
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123 asset_out_path = os.path.join(self._out_dir, rel_req_path)
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124
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125 if self.synchronous_asset_pipeline:
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126 pipeline = ProcessorPipeline(
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127 app, mounts, self._out_dir,
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128 skip_patterns=self._skip_patterns,
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129 force_patterns=self._force_patterns)
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130 pipeline.run(asset_in_path)
3
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parents:
diff changeset
131
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diff changeset
132 logger.debug("Serving %s" % asset_out_path)
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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diff changeset
133 wrapper = wrap_file(environ, open(asset_out_path, 'rb'))
3
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diff changeset
134 response = Response(wrapper)
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diff changeset
135 _, ext = os.path.splitext(rel_req_path)
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diff changeset
136 response.mimetype = self._mimetype_map.get(
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parents:
diff changeset
137 ext.lstrip('.'), 'text/plain')
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parents:
diff changeset
138 return response
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diff changeset
139
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diff changeset
140 def _try_serve_page_asset(self, app, environ, request):
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diff changeset
141 if not request.path.startswith('/_asset/'):
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diff changeset
142 return None
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diff changeset
143
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diff changeset
144 full_path = os.path.join(app.root_dir, request.path[len('/_asset/'):])
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diff changeset
145 if not os.path.isfile(full_path):
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diff changeset
146 return None
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parents:
diff changeset
147
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diff changeset
148 logger.debug("Serving %s" % full_path)
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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diff changeset
149 wrapper = wrap_file(environ, open(full_path, 'rb'))
3
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diff changeset
150 response = Response(wrapper)
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diff changeset
151 _, ext = os.path.splitext(full_path)
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diff changeset
152 response.mimetype = self._mimetype_map.get(
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diff changeset
153 ext.lstrip('.'), 'text/plain')
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diff changeset
154 return response
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diff changeset
155
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diff changeset
156 def _try_serve_page(self, app, environ, request):
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157 # Try to find what matches the requested URL.
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158 req_path = request.path
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diff changeset
159 page_num = 1
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diff changeset
160 pgn_suffix_re = app.config.get('__cache/pagination_suffix_re')
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diff changeset
161 pgn_suffix_m = re.search(pgn_suffix_re, request.path)
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diff changeset
162 if pgn_suffix_m:
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diff changeset
163 req_path = request.path[:pgn_suffix_m.start()]
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diff changeset
164 page_num = int(pgn_suffix_m.group('num'))
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diff changeset
165
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diff changeset
166 routes = find_routes(app.routes, req_path)
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diff changeset
167 if len(routes) == 0:
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168 raise RouteNotFoundError("Can't find route for: %s" % req_path)
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diff changeset
169
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diff changeset
170 taxonomy = None
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diff changeset
171 for route, route_metadata in routes:
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diff changeset
172 source = app.getSource(route.source_name)
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diff changeset
173 if route.taxonomy is None:
11
617191dec18e Fixes for Windows, make `findPagePath` return a ref path.
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diff changeset
174 rel_path, fac_metadata = source.findPagePath(
3
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parents:
diff changeset
175 route_metadata, MODE_PARSING)
11
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diff changeset
176 if rel_path is not None:
3
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diff changeset
177 break
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diff changeset
178 else:
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diff changeset
179 taxonomy = app.getTaxonomy(route.taxonomy)
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diff changeset
180 term_value = route_metadata.get(taxonomy.term_name)
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diff changeset
181 if term_value is not None:
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diff changeset
182 tax_page_ref = taxonomy.getPageRef(source.name)
11
617191dec18e Fixes for Windows, make `findPagePath` return a ref path.
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parents: 7
diff changeset
183 rel_path = tax_page_ref.rel_path
3
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parents:
diff changeset
184 source = tax_page_ref.source
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diff changeset
185 fac_metadata = {taxonomy.term_name: term_value}
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parents:
diff changeset
186 break
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parents:
diff changeset
187 else:
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diff changeset
188 raise SourceNotFoundError("Can't find path for: %s "
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parents:
diff changeset
189 "(looked in: %s)" %
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parents:
diff changeset
190 (req_path, [r.source_name for r, _ in routes]))
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parents:
diff changeset
191
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parents:
diff changeset
192 # Build the page and render it.
11
617191dec18e Fixes for Windows, make `findPagePath` return a ref path.
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diff changeset
193 fac = PageFactory(source, rel_path, fac_metadata)
617191dec18e Fixes for Windows, make `findPagePath` return a ref path.
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diff changeset
194 page = fac.buildPage()
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
195 render_ctx = PageRenderingContext(page, req_path, page_num)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
196 if taxonomy is not None:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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diff changeset
197 flt = PaginationFilter()
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
198 if taxonomy.is_multiple:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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diff changeset
199 flt.addClause(HasFilterClause(taxonomy.name, term_value))
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
200 else:
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parents:
diff changeset
201 flt.addClause(IsFilterClause(taxonomy.name, term_value))
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
202 render_ctx.pagination_filter = flt
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
203
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
204 render_ctx.custom_data = {
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
205 taxonomy.term_name: term_value}
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
206 rendered_page = render_page(render_ctx)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
207 rp_content = rendered_page.content
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
208
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
209 if app.debug:
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
210 now_time = time.clock()
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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parents: 5
diff changeset
211 timing_info = ('%8.1f ms' %
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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parents: 5
diff changeset
212 ((now_time - app.env.start_time) * 1000.0))
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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parents: 5
diff changeset
213 rp_content = rp_content.replace('__PIECRUST_TIMING_INFORMATION__',
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
214 timing_info)
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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parents: 5
diff changeset
215
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
216 # Start response.
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
217 response = Response()
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
218
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
219 etag = hashlib.md5(rp_content.encode('utf8')).hexdigest()
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
220 if not app.debug and etag in request.if_none_match:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
221 response.status_code = 304
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
222 return response
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
223
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
224 response.set_etag(etag)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
225 response.content_md5 = etag
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
226
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
227 cache_control = response.cache_control
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
228 if app.debug:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
229 cache_control.no_cache = True
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
230 cache_control.must_revalidate = True
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
231 else:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
232 cache_time = (page.config.get('cache_time') or
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
233 app.config.get('site/cache_time'))
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
234 if cache_time:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
235 cache_control.public = True
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
236 cache_control.max_age = cache_time
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
237
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
238 content_type = page.config.get('content_type')
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
239 if content_type and '/' not in content_type:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
240 mimetype = content_type_map.get(content_type, content_type)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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parents:
diff changeset
241 else:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
242 mimetype = content_type
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
243 if mimetype:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
244 response.mimetype = mimetype
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
245
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
246 if ('gzip' in request.accept_encodings and
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
247 app.config.get('site/enable_gzip')):
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
248 try:
7
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
249 with io.BytesIO() as gzip_buffer:
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
250 with gzip.open(gzip_buffer, mode='wt',
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
251 encoding='utf8') as gzip_file:
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
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parents: 5
diff changeset
252 gzip_file.write(rp_content)
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
253 rp_content = gzip_buffer.getvalue()
343d08ef5668 More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
254 response.content_encoding = 'gzip'
3
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
255 except Exception:
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
256 logger.exception("Error compressing response, "
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
257 "falling back to uncompressed.")
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
258 response.set_data(rp_content)
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
259
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
260 return response
f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
Ludovic Chabant <ludovic@chabant.com>
parents:
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261
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262 def _handle_error(self, exception, environ, start_response):
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263 path = 'error'
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264 if isinstance(exception, NotFound):
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265 path = '404'
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266 env = Environment(loader=ErrorMessageLoader())
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267 template = env.get_template(path)
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268 context = {'details': str(exception)}
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269 response = Response(template.render(context), mimetype='text/html')
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270 return response(environ, start_response)
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271
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272
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273 class WsgiServer(object):
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274 def __init__(self, server):
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275 self.server = server
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276
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277 def __call__(self, environ, start_response):
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278 return self.server._run_request(environ, start_response)
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279
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280
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281 class RouteNotFoundError(Exception):
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282 pass
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283
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284
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285 class SourceNotFoundError(Exception):
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286 pass
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287
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288
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289 content_type_map = {
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290 'html': 'text/html',
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291 'xml': 'text/xml',
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292 'txt': 'text/plain',
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293 'text': 'text/plain',
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294 'css': 'text/css',
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295 'xhtml': 'application/xhtml+xml',
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296 'atom': 'application/atom+xml', # or 'text/xml'?
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297 'rss': 'application/rss+xml', # or 'text/xml'?
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298 'json': 'application/json'}
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299
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300
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301 def find_routes(routes, uri):
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302 uri = uri.lstrip('/')
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303 res = []
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304 for route in routes:
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305 m = route.uri_re.match(uri)
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306 if m:
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307 metadata = m.groupdict()
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308 res.append((route, metadata))
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309 return res
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310
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311
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312 class ErrorMessageLoader(FileSystemLoader):
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313 def __init__(self):
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314 base_dir = os.path.join(os.path.dirname(__file__), 'resources',
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315 'messages')
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316 super(ErrorMessageLoader, self).__init__(base_dir)
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317
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318 def get_source(self, env, template):
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319 template += '.html'
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320 return super(ErrorMessageLoader, self).get_source(env, template)
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321
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322
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323 def load_mimetype_map():
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324 mimetype_map = {}
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325 sep_re = re.compile(r'\s+')
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326 path = os.path.join(os.path.dirname(__file__), 'mime.types')
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327 with open(path, 'r') as f:
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328 for line in f:
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329 tokens = sep_re.split(line)
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330 if len(tokens) > 1:
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331 for t in tokens[1:]:
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332 mimetype_map[t] = tokens[0]
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333 return mimetype_map
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334