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annotate piecrust/serving/server.py @ 1079:00a0a65d08e6

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data: Fix debug rendering of the family data.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 15 Feb 2018 21:15:30 -0800
parents 45ad976712ec
children e94737572542
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.rendering import RenderingContext, render_page
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14 from piecrust.routing import RouteNotFoundError
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15 from piecrust.serving.util import (
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16 content_type_map, make_wrapped_file_response, get_requested_page,
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17 get_app_for_server)
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18 from piecrust.sources.base import SourceNotFoundError
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20
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21 logger = logging.getLogger(__name__)
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22
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23
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24 class PieCrustServer(object):
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25 """ A WSGI application that serves a PieCrust website.
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26 """
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27 def __init__(self, appfactory, **kwargs):
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28 self.server = _ServerImpl(appfactory, **kwargs)
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29
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30 def __call__(self, environ, start_response):
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31 return self.server._run_request(environ, start_response)
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32
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33
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34 class MultipleNotFound(HTTPException):
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35 """ Represents a 404 (not found) error that tried to serve one or
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36 more pages. It will report which pages it tried to serve
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37 before failing.
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38 """
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39 code = 404
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40
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41 def __init__(self, description, nfes):
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42 super(MultipleNotFound, self).__init__(description)
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43 self._nfes = nfes
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44
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45 def get_description(self, environ=None):
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46 from werkzeug.utils import escape
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47 desc = '<p>' + self.description + '</p>'
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48 desc += '<p>'
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49 for nfe in self._nfes:
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50 desc += '<li>' + escape(str(nfe)) + '</li>'
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51 desc += '</p>'
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52 return desc
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53
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54
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55 class _ServerImpl(object):
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56 """ The PieCrust server.
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57 """
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58 def __init__(self, appfactory,
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59 enable_debug_info=True,
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60 root_url='/',
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61 static_preview=True):
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62 self.appfactory = appfactory
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63 self.enable_debug_info = enable_debug_info
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64 self.root_url = root_url
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65 self.static_preview = static_preview
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66 self._out_dir = os.path.join(
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67 appfactory.root_dir,
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68 CACHE_DIR,
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69 (appfactory.cache_key or 'default'),
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70 'server')
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71
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72 def _run_request(self, environ, start_response):
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73 try:
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74 response = self._try_run_request(environ)
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75 return response(environ, start_response)
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76 except Exception as ex:
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77 if self.appfactory.debug:
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78 raise
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79 return self._handle_error(ex, environ, start_response)
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80
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81 def _try_run_request(self, environ):
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82 request = Request(environ)
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83
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84 # We don't support anything else than GET requests since we're
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85 # previewing something that will be static later.
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86 if self.static_preview and request.method != 'GET':
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87 logger.error("Only GET requests are allowed, got %s" %
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88 request.method)
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89 raise MethodNotAllowed()
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90
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91 # Handle requests to a pipeline-built asset right away.
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92 response = self._try_serve_asset(environ, request)
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93 if response is not None:
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94 return response
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95
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96 # Same for page assets.
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97 response = self._try_serve_page_asset(
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98 self.appfactory.root_dir, environ, request)
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99 if response is not None:
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100 return response
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101
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102 # Create the app for this request.
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103 app = get_app_for_server(self.appfactory,
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104 root_url=self.root_url)
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105 if (app.config.get('server/enable_debug_info') and
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106 self.enable_debug_info and
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107 '!debug' in request.args):
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108 app.config.set('site/show_debug_info', True)
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109
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110 # Let's try to serve a page.
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111 try:
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112 response = self._try_serve_page(app, environ, request)
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113 return response
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114 except (RouteNotFoundError, SourceNotFoundError) as ex:
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115 raise NotFound() from ex
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116 except HTTPException:
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117 raise
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118 except Exception as ex:
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119 if app.debug:
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120 logger.exception(ex)
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121 raise
523
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122 logger.error(str(ex))
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diff changeset
123 msg = "There was an error trying to serve: %s" % request.path
374
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124 raise InternalServerError(msg) from ex
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125
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126 def _try_serve_asset(self, environ, request):
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127 offset = len(self.root_url)
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128 rel_req_path = request.path[offset:].replace('/', os.sep)
374
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129 if request.path.startswith('/_cache/'):
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130 # Some stuff needs to be served directly from the cache directory,
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131 # like LESS CSS map files.
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132 full_path = os.path.join(self.appfactory.root_dir, rel_req_path)
374
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133 else:
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134 full_path = os.path.join(self._out_dir, rel_req_path)
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135
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136 try:
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137 return make_wrapped_file_response(environ, request, full_path)
374
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138 except OSError:
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139 return None
374
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140
852
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141 def _try_serve_page_asset(self, app_root_dir, environ, request):
575
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142 if not request.path.startswith(self.root_url + '_asset/'):
374
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143 return None
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144
575
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145 offset = len(self.root_url + '_asset/')
852
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146 full_path = os.path.join(app_root_dir, request.path[offset:])
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147
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148 try:
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149 return make_wrapped_file_response(environ, request, full_path)
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150 except OSError:
374
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151 return None
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152
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153 def _try_serve_page(self, app, environ, request):
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154 # Find a matching page.
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diff changeset
155 req_page = get_requested_page(app, request.path)
374
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156
555
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157 # If we haven't found any good match, report all the places we didn't
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158 # find it at.
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diff changeset
159 if req_page.page is None:
555
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160 msg = "Can't find path for '%s':" % request.path
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161 raise MultipleNotFound(msg, req_page.not_found_errors)
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diff changeset
162
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diff changeset
163 # We have a page, let's try to render it.
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diff changeset
164 render_ctx = RenderingContext(req_page.page,
853
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diff changeset
165 sub_num=req_page.sub_num,
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166 force_render=True)
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diff changeset
167 req_page.page.source.prepareRenderContext(render_ctx)
555
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diff changeset
168
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diff changeset
169 # Render the page.
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diff changeset
170 rendered_page = render_page(render_ctx)
374
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171
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diff changeset
172 # Start doing stuff.
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diff changeset
173 page = rendered_page.page
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174 rp_content = rendered_page.content
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diff changeset
175
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diff changeset
176 # Profiling.
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diff changeset
177 if app.config.get('site/show_debug_info'):
554
155c7e20414f serve: Fix timing information in the debug window.
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diff changeset
178 now_time = time.perf_counter()
374
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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179 timing_info = (
852
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diff changeset
180 '%8.1f ms' %
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181 ((now_time - app.env.start_time) * 1000.0))
374
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182 rp_content = rp_content.replace(
852
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183 '__PIECRUST_TIMING_INFORMATION__', timing_info)
374
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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184
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diff changeset
185 # Build the response.
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diff changeset
186 response = Response()
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diff changeset
187
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188 etag = hashlib.md5(rp_content.encode('utf8')).hexdigest()
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189 if not app.debug and etag in request.if_none_match:
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diff changeset
190 response.status_code = 304
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diff changeset
191 return response
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diff changeset
192
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diff changeset
193 response.set_etag(etag)
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194 response.content_md5 = etag
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195
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diff changeset
196 cache_control = response.cache_control
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diff changeset
197 if app.debug:
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diff changeset
198 cache_control.no_cache = True
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diff changeset
199 cache_control.must_revalidate = True
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diff changeset
200 else:
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diff changeset
201 cache_time = (page.config.get('cache_time') or
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202 app.config.get('site/cache_time'))
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diff changeset
203 if cache_time:
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diff changeset
204 cache_control.public = True
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diff changeset
205 cache_control.max_age = cache_time
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diff changeset
206
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diff changeset
207 content_type = page.config.get('content_type')
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diff changeset
208 if content_type and '/' not in content_type:
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diff changeset
209 mimetype = content_type_map.get(content_type, content_type)
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diff changeset
210 else:
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diff changeset
211 mimetype = content_type
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diff changeset
212 if mimetype:
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diff changeset
213 response.mimetype = mimetype
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diff changeset
214
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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parents:
diff changeset
215 if ('gzip' in request.accept_encodings and
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diff changeset
216 app.config.get('site/enable_gzip')):
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diff changeset
217 try:
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diff changeset
218 with io.BytesIO() as gzip_buffer:
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diff changeset
219 with gzip.open(gzip_buffer, mode='wt',
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diff changeset
220 encoding='utf8') as gzip_file:
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diff changeset
221 gzip_file.write(rp_content)
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diff changeset
222 rp_content = gzip_buffer.getvalue()
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diff changeset
223 response.content_encoding = 'gzip'
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parents:
diff changeset
224 except Exception:
523
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diff changeset
225 logger.error("Error compressing response, "
b22e69ff54f4 serve: Don't show the same error message twice.
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diff changeset
226 "falling back to uncompressed.")
374
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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diff changeset
227 response.set_data(rp_content)
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diff changeset
228
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229 return response
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diff changeset
230
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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diff changeset
231 def _handle_error(self, exception, environ, start_response):
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diff changeset
232 code = 500
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diff changeset
233 if isinstance(exception, HTTPException):
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diff changeset
234 code = exception.code
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parents:
diff changeset
235
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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parents:
diff changeset
236 path = 'error'
517
c7e8b4a5afe3 serve: Improve error reporting when pages are not found.
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parents: 515
diff changeset
237 if isinstance(exception, (NotFound, MultipleNotFound)):
374
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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parents:
diff changeset
238 path += '404'
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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parents:
diff changeset
239
fa3ee8a8ee2d serve: Split the server code in a couple modules inside a `serving` package.
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parents:
diff changeset
240 descriptions = self._get_exception_descriptions(exception)
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241
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242 env = Environment(loader=ErrorMessageLoader())
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243 template = env.get_template(path)
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244 context = {'details': descriptions}
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245 response = Response(template.render(context), mimetype='text/html')
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246 response.status_code = code
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247 return response(environ, start_response)
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248
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249 def _get_exception_descriptions(self, exception):
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250 desc = []
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251 while exception is not None:
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252 if isinstance(exception, MultipleNotFound):
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253 desc += [str(e) for e in exception._nfes]
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254 elif isinstance(exception, HTTPException):
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255 desc.append(exception.get_description())
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256 else:
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257 desc.append(str(exception))
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258
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259 inner_ex = exception.__cause__
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260 if inner_ex is None:
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261 inner_ex = exception.__context__
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262 exception = inner_ex
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263 return desc
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264
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265
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266 class ErrorMessageLoader(FileSystemLoader):
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267 def __init__(self):
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268 base_dir = os.path.join(RESOURCES_DIR, 'messages')
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269 super(ErrorMessageLoader, self).__init__(base_dir)
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270
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271 def get_source(self, env, template):
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272 template += '.html'
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273 return super(ErrorMessageLoader, self).get_source(env, template)
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274