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annotate piecrust/serving/server.py @ 1148:0aeb6f18d6a0

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bake: Don't crash if a source doesn't implement related items.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 10 Jul 2018 21:01:45 -0700
parents e94737572542
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import io
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2 import os
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3 import gzip
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4 import time
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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 from werkzeug.exceptions import (
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9 NotFound, MethodNotAllowed, InternalServerError, HTTPException)
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10 from werkzeug.wrappers import Request, Response
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11 from jinja2 import FileSystemLoader, Environment
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12 from piecrust import CACHE_DIR, RESOURCES_DIR
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13 from piecrust.page import PageNotFoundError
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14 from piecrust.rendering import RenderingContext, render_page
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15 from piecrust.routing import RouteNotFoundError
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16 from piecrust.serving.util import (
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17 content_type_map, make_wrapped_file_response, get_requested_pages,
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18 get_app_for_server)
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19 from piecrust.sources.base import SourceNotFoundError
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22 logger = logging.getLogger(__name__)
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24
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25 class PieCrustServer(object):
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26 """ A WSGI application that serves a PieCrust website.
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27 """
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28 def __init__(self, appfactory, **kwargs):
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29 self.server = _ServerImpl(appfactory, **kwargs)
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30
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31 def __call__(self, environ, start_response):
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32 return self.server._run_request(environ, start_response)
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33
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34
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35 class MultipleNotFound(HTTPException):
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36 """ Represents a 404 (not found) error that tried to serve one or
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37 more pages. It will report which pages it tried to serve
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38 before failing.
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39 """
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40 code = 404
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41
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42 def __init__(self, description, nfes):
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43 super(MultipleNotFound, self).__init__(description)
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44 self._nfes = nfes
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45
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46 def get_description(self, environ=None):
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47 from werkzeug.utils import escape
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48 desc = '<p>' + self.description + '</p>'
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49 desc += '<p>'
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50 for nfe in self._nfes:
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51 desc += '<li>' + escape(str(nfe)) + '</li>'
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52 desc += '</p>'
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53 return desc
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54
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55
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56 class _ServerImpl(object):
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57 """ The PieCrust server.
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58 """
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59 def __init__(self, appfactory,
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60 enable_debug_info=True,
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61 root_url='/',
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62 static_preview=True):
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63 self.appfactory = appfactory
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64 self.enable_debug_info = enable_debug_info
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65 self.root_url = root_url
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66 self.static_preview = static_preview
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67 self._out_dir = os.path.join(
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68 appfactory.root_dir,
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69 CACHE_DIR,
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70 (appfactory.cache_key or 'default'),
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71 'server')
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72
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73 def _run_request(self, environ, start_response):
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74 try:
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75 response = self._try_run_request(environ)
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76 return response(environ, start_response)
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77 except Exception as ex:
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78 if self.appfactory.debug:
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79 raise
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80 return self._handle_error(ex, environ, start_response)
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81
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82 def _try_run_request(self, environ):
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83 request = Request(environ)
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84
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85 # We don't support anything else than GET requests since we're
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86 # previewing something that will be static later.
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87 if self.static_preview and request.method != 'GET':
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88 logger.error("Only GET requests are allowed, got %s" %
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89 request.method)
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90 raise MethodNotAllowed()
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91
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92 # Handle requests to a pipeline-built asset right away.
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93 response = self._try_serve_asset(environ, request)
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94 if response is not None:
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95 return response
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96
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97 # Same for page assets.
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98 response = self._try_serve_page_asset(
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99 self.appfactory.root_dir, environ, request)
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100 if response is not None:
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101 return response
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102
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103 # Create the app for this request.
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104 app = get_app_for_server(self.appfactory,
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105 root_url=self.root_url)
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106 if (app.config.get('server/enable_debug_info') and
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107 self.enable_debug_info and
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108 '!debug' in request.args):
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109 app.config.set('site/show_debug_info', True)
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110
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111 # Let's try to serve a page.
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112 try:
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113 response = self._try_serve_page(app, environ, request)
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114 return response
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115 except (RouteNotFoundError, SourceNotFoundError) as ex:
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116 raise NotFound() from ex
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117 except HTTPException:
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118 raise
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119 except Exception as ex:
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120 if app.debug:
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121 logger.exception(ex)
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122 raise
523
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diff changeset
123 logger.error(str(ex))
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diff changeset
124 msg = "There was an error trying to serve: %s" % request.path
374
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125 raise InternalServerError(msg) from ex
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126
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127 def _try_serve_asset(self, environ, request):
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128 offset = len(self.root_url)
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diff changeset
129 rel_req_path = request.path[offset:].replace('/', os.sep)
374
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130 if request.path.startswith('/_cache/'):
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131 # Some stuff needs to be served directly from the cache directory,
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132 # like LESS CSS map files.
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133 full_path = os.path.join(self.appfactory.root_dir, rel_req_path)
374
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134 else:
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135 full_path = os.path.join(self._out_dir, rel_req_path)
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136
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137 try:
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138 return make_wrapped_file_response(environ, request, full_path)
374
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139 except OSError:
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140 return None
374
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141
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142 def _try_serve_page_asset(self, app_root_dir, environ, request):
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143 if not request.path.startswith(self.root_url + '_asset/'):
374
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144 return None
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145
575
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146 offset = len(self.root_url + '_asset/')
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147 full_path = os.path.join(app_root_dir, request.path[offset:])
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148
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149 try:
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150 return make_wrapped_file_response(environ, request, full_path)
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151 except OSError:
374
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152 return None
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153
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154 def _try_serve_page(self, app, environ, request):
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155 # Find a matching page.
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156 req_pages, not_founds = get_requested_pages(app, request.path)
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157
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158 rendered_page = None
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159
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160 for req_page in req_pages:
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161 # We have a page, let's try to render it.
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162 render_ctx = RenderingContext(req_page.page,
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163 sub_num=req_page.sub_num,
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164 force_render=True)
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165 req_page.page.source.prepareRenderContext(render_ctx)
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166
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167 # Render the page.
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168 this_rendered_page = render_page(render_ctx)
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169
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170 # We might have rendered a page that technically exists, but
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171 # has no interesting content, like a tag page for a tag that
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172 # isn't used by any page. To eliminate these false positives,
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173 # we check if there was pagination used, and if so, if it had
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174 # anything in it.
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175 # TODO: we might need a more generic system for other cases.
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176 render_info = this_rendered_page.render_info
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177 if (render_info['used_pagination'] and
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178 not render_info['pagination_has_items']):
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179 not_founds.append(PageNotFoundError(
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180 ("Rendered '%s' (page %d) in source '%s' "
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181 "but got empty content:\n\n%s\n\n") %
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diff changeset
182 (req_page.req_path, req_page.sub_num,
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183 req_page.page.source.name, this_rendered_page.content)))
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diff changeset
184 continue
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diff changeset
185
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diff changeset
186 rendered_page = this_rendered_page
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diff changeset
187 break
374
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188
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189 # If we haven't found any good match, report all the places we didn't
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diff changeset
190 # find it at.
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diff changeset
191 if rendered_page is None:
555
daf8df5ade7d serve: Refactor the server to make pieces usable by the debugging middleware.
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diff changeset
192 msg = "Can't find path for '%s':" % request.path
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193 raise MultipleNotFound(msg, not_founds)
374
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194
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195 # Start doing stuff.
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diff changeset
196 page = rendered_page.page
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197 rp_content = rendered_page.content
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198
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diff changeset
199 # Profiling.
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diff changeset
200 if app.config.get('site/show_debug_info'):
554
155c7e20414f serve: Fix timing information in the debug window.
Ludovic Chabant <ludovic@chabant.com>
parents: 553
diff changeset
201 now_time = time.perf_counter()
374
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diff changeset
202 timing_info = (
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diff changeset
203 '%8.1f ms' %
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204 ((now_time - app.env.start_time) * 1000.0))
374
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diff changeset
205 rp_content = rp_content.replace(
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diff changeset
206 '__PIECRUST_TIMING_INFORMATION__', timing_info)
374
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diff changeset
207
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diff changeset
208 # Build the response.
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diff changeset
209 response = Response()
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diff changeset
210
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diff changeset
211 etag = hashlib.md5(rp_content.encode('utf8')).hexdigest()
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diff changeset
212 if not app.debug and etag in request.if_none_match:
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213 response.status_code = 304
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diff changeset
214 return response
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diff changeset
215
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diff changeset
216 response.set_etag(etag)
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diff changeset
217 response.content_md5 = etag
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218
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diff changeset
219 cache_control = response.cache_control
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diff changeset
220 if app.debug:
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diff changeset
221 cache_control.no_cache = True
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222 cache_control.must_revalidate = True
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223 else:
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diff changeset
224 cache_time = (page.config.get('cache_time') or
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225 app.config.get('site/cache_time'))
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diff changeset
226 if cache_time:
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diff changeset
227 cache_control.public = True
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diff changeset
228 cache_control.max_age = cache_time
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229
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230 content_type = page.config.get('content_type')
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diff changeset
231 if content_type and '/' not in content_type:
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diff changeset
232 mimetype = content_type_map.get(content_type, content_type)
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233 else:
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diff changeset
234 mimetype = content_type
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diff changeset
235 if mimetype:
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diff changeset
236 response.mimetype = mimetype
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diff changeset
237
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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diff changeset
238 if ('gzip' in request.accept_encodings and
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diff changeset
239 app.config.get('site/enable_gzip')):
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240 try:
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241 with io.BytesIO() as gzip_buffer:
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242 with gzip.open(gzip_buffer, mode='wt',
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243 encoding='utf8') as gzip_file:
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244 gzip_file.write(rp_content)
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245 rp_content = gzip_buffer.getvalue()
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246 response.content_encoding = 'gzip'
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247 except Exception:
523
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248 logger.error("Error compressing response, "
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249 "falling back to uncompressed.")
374
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250 response.set_data(rp_content)
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251
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252 return response
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253
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254 def _handle_error(self, exception, environ, start_response):
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255 code = 500
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256 if isinstance(exception, HTTPException):
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257 code = exception.code
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258
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259 path = 'error'
517
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260 if isinstance(exception, (NotFound, MultipleNotFound)):
374
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261 path += '404'
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262
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263 descriptions = self._get_exception_descriptions(exception)
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264
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265 env = Environment(loader=ErrorMessageLoader())
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266 template = env.get_template(path)
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267 context = {'details': descriptions}
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268 response = Response(template.render(context), mimetype='text/html')
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269 response.status_code = code
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270 return response(environ, start_response)
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271
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272 def _get_exception_descriptions(self, exception):
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273 desc = []
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274 while exception is not None:
517
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275 if isinstance(exception, MultipleNotFound):
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276 desc += [str(e) for e in exception._nfes]
517
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277 elif isinstance(exception, HTTPException):
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278 desc.append(exception.get_description())
374
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279 else:
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280 desc.append(str(exception))
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281
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282 inner_ex = exception.__cause__
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283 if inner_ex is None:
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284 inner_ex = exception.__context__
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285 exception = inner_ex
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286 return desc
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287
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288
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289 class ErrorMessageLoader(FileSystemLoader):
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290 def __init__(self):
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291 base_dir = os.path.join(RESOURCES_DIR, 'messages')
374
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292 super(ErrorMessageLoader, self).__init__(base_dir)
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293
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294 def get_source(self, env, template):
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295 template += '.html'
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296 return super(ErrorMessageLoader, self).get_source(env, template)
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297