Mercurial > hg > decoupage

annotate decoupage/web.py @ 43:8621a6e2fe38

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actual sane error handling that human beings can read and decipher
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 01 Sep 2010 07:22:58 -0700
parents e0e1a339070c
children af73a3fda723
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1 """
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2 decoupage: a view with webob to index and serve static content
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3 """
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5 import os
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6 import sys
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7
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8 from contenttransformer.app import FileTypeTransformer
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9 from contenttransformer.app import transformers
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10 from formatters import formatters
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11
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12 from genshi.builder import Markup
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13 from genshi.template import TemplateLoader
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14 from genshi.template.base import TemplateError
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15 from genshi.template.base import TemplateSyntaxError
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16 from martini.config import ConfigMunger
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17 from paste.fileapp import FileApp
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18 from pkg_resources import resource_filename
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19 from pkg_resources import iter_entry_points
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20 from webob import Request, Response, exc
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22 transformers = [i.lower() for i in transformers()]
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24 class Decoupage(object):
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26 ### class level variables
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27 defaults = { 'auto_reload': 'False',
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28 'configuration': None,
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29 'directory': None, # directory to serve
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30 'cascade': 'True', # whether to cascade configuration
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31 'template': 'index.html', # XXX see below
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32 'template_directories': '' # list of directories to look for templates
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33 }
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35 def __init__(self, **app_conf):
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37 # set defaults from app configuration
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38 kw = self.app_conf('decoupage', app_conf)
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39 for key in self.defaults:
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40 setattr(self, key, kw.get(key, self.defaults[key]))
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42 # configure defaults
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43 self.auto_reload = self.auto_reload.lower() == 'true'
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44 self.cascade = self.cascade.lower() == 'true'
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45 self.directory = self.directory.rstrip(os.path.sep)
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46 assert os.path.isdir(self.directory)
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47 self.template_directories = self.template_directories.split() # no spaces in directory names, for now
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48
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49 for directory in self.template_directories:
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50 assert os.path.isdir(directory), "Decoupage template directory %s does not exist!" % directory
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52 # static file server
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53 self.fileserver = FileApp # XXX still used?!?
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55 # pluggable index data formatters
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56 self.formatters = {}
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57 for formatter in iter_entry_points('decoupage.formatters'):
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58 try:
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59 _formatter = formatter.load()
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60 template_dir = resource_filename(formatter.module_name, 'templates')
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61 if template_dir not in self.template_directories and os.path.isdir(template_dir):
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62 self.template_directories.append(template_dir)
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63 except:
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64 print "Couldn't load formatter: %s" % formatter
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65 continue
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66 self.formatters[formatter.name] = _formatter
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68 # template loader
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69 self.loader = TemplateLoader(self.template_directories,
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70 auto_reload=self.auto_reload)
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71
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73
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74 ### methods dealing with HTTP
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75 def __call__(self, environ, start_response):
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76 request = Request(environ)
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77 filename = request.path_info.strip('/')
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78 path = os.path.join(self.directory, filename)
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79 if os.path.exists(path):
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80 if os.path.isdir(path):
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81
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82 if not request.path_info.endswith('/'):
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83 raise exc.HTTPMovedPermanently(add_slash=True)
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85 res = self.get(request)
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86 return res(environ, start_response)
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87 else:
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88 conf = self.conf(request.path_info.rsplit('/',1)[0])
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89 if '/transformer' in conf:
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90 args = [i.split('=', 1) for i in conf['/transformer'].split(',') if '=' in i]
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91 kwargs = {}
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92 for i in conf:
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93 if i.startswith('/'):
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94 name = i[1:].lower()
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95 if name in transformers:
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96 kwargs[name] = dict([j.split('=', 1) for j in conf[i].split(',') if '=' in j])
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97 fileserver = FileTypeTransformer(*args, **kwargs)
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98 else:
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99 fileserver = FileApp
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100
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101 fileserver = fileserver(path)
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102 return fileserver(environ, start_response)
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103 else:
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104 raise exc.HTTPNotFound()
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105
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106
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107 def get(self, request):
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108 """
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109 return response to a GET requst
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110 """
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111 # ensure a sane path
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112 path = request.path_info.strip('/')
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113 directory = os.path.join(self.directory, path)
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114 path = '/%s' % path
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115
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116 # get the configuraton
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117 conf = self.conf(path)
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118
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119 ### build data dictionary
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120 files = self.filedata(path, directory, conf)
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121 data = {'path': path, 'files': files, 'request': request }
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122
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123 # defaults; TODO: make this better
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124 data['title'] = conf.get('/title')
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125 data['directory'] = directory
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126 data['include'] = None
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127 data['css'] = ()
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128 data['scripts'] = ()
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129 data['icon'] = None
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130
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131 # apply formatters
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132 # XXX this should be cached if not self.auto_reload
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133 if '/formatters' in conf:
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134 # ordered list of formatters to be applied first
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135 formatters = [ i for i in conf['/formatters'].split()
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136 if i in self.formatters ]
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137 else:
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138 formatters = []
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139 for key in conf:
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140 if key.startswith('/'):
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141 key = key[1:]
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142 if key in self.formatters and key not in formatters:
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143 formatters.append(key)
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144 for name in formatters:
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145 formatter = self.formatters[name](conf.get('/%s' % name, ''))
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146 formatter(request, data)
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147
0
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148 # render the template
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149 template = conf.get('/template')
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150 local_index = False
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151 if template is None:
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152 if 'index.html' in [ f['name'] for f in files ]:
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153 local_index = os.path.join(directory, 'index.html')
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154 template = local_index
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155 else:
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156 template = self.template
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157 else:
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158 if not os.path.isabs(template):
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159 _template = os.path.join(directory, template)
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160 if os.path.exists(_template):
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161 template = _template
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162 else:
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163 for directory in self.template_directories:
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164 if template in os.listdir(directory):
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165 break
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166 else:
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167 raise IOError("template %s not found" % template)
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168
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169 try:
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170 template = self.loader.load(template)
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171 res = template.generate(**data).render('html', doctype='html')
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172 except (TemplateError, TemplateSyntaxError), e:
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173 if local_index:
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174 print repr(e)
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175 return self.fileserver(local_index)
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176 raise
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177
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178 return Response(content_type='text/html', body=res)
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179
0
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180
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181 ### internal methods
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182
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183 def filedata(self, path, directory, conf):
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184 files = []
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185
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186 # TODO: other items to add
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187 # type: 'file' or 'directory'
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188 # last_modified
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189 # created
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190
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191 for i in os.listdir(directory):
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192 files.append({'path' : '%s/%s' % (path.rstrip('/'), i),
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193 'name': i,
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194 'description': conf.get(i.lower(), None)})
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195
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196 # TODO: deal with other links in conf
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197
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198 return files
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199
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200 def conf(self, path, cascade=None):
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201 """returns configuration dictionary appropriate to a path"""
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202 if cascade is None:
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203 cascase = self.cascade
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204
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205 directory = os.path.join(self.directory, path.strip('/'))
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206 if path.strip('/'):
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207 path_tuple = tuple(path.strip('/').split('/'))
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208 else:
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209 path_tuple = ()
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210
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211 # return cached configuration
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212 if hasattr(self, '_conf') and path_tuple in self._conf:
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213 return self._conf[path_tuple]
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214
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215 conf = {}
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216
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217 # local configuration
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218 ini_path = os.path.join(directory, 'index.ini')
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219 if os.path.exists(ini_path):
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220 _conf = ConfigMunger(ini_path).dict()
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221 if len(_conf) == 1:
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222 conf = _conf[_conf.keys()[0]].copy()
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223
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224 # global configuration
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225 if not conf and self.configuration and os.path.exists(self.configuration):
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226 conf = ConfigMunger(self.configuration).dict().get('/%s' % path.rstrip('/'), {})
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227
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228 # inherit and cascade configuration
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229 inherit_directory = None
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230 if '/inherit' in conf:
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231 inherit_directory = conf['/inherit']
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232 elif self.cascade and path_tuple:
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233 inherit_directory = '/%s' % '/'.join(path_tuple[:-1])
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234 if inherit_directory:
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235 parent_configuration = self.conf(inherit_directory)
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236 for key, value in parent_configuration.items():
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237 if key.startswith('/') and key not in conf:
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238 conf[key] = value
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239
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240 # cache configuration
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241 if not self.auto_reload:
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242 if not hasattr(self, '_conf'):
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243 self._conf = {}
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244 self._conf[path_tuple] = conf
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245
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246 return conf
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247
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248 def fmtrs(self, path):
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249 formatters = []
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250 for key, value in self.conf(path).items():
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251 if key.startswith('/'):
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252 key = key[1:]
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253 if key in self.formatters:
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254 formatter = self.formatters[key](value)
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255
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256
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257 def app_conf(self, keystr, app_conf):
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258 keystr += '.'
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259 return dict([(key.split(keystr, 1)[-1], value)
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260 for key, value in app_conf.items()
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261 if key.startswith(keystr) ])