annotate wsgraph/web.py @ 46:2d57cda87036

start noting useful graph DBs
author Jeff Hammel <jhammel@mozilla.com>
date Tue, 16 Apr 2013 01:03:19 -0700
parents 24d57daaca21
children
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1 #!/usr/bin/env python
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2
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3 """
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4 web handler for WSGraph
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5 """
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6
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7 import json
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8 import sys
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9 from webob import Request, Response, exc
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10
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11 # rank constants
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12 GRAPH = 0
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13 NODE = 1
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14 EDGE = 2
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15
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16 # XXX stubbing hack
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17 class JSONformatter(object):
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19 def __init__(self, content_type='application/json', sort_keys=True):
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20 self.content_type = content_type
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21 self.sort_keys = sort_keys
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22
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23 def format(self, instance):
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24 """front-end to json.dumps"""
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25 return json.dumps(instance, sort_keys=self.sort_keys)
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26
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27 def node(self, request, graph, node):
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28 return Response(content_type=self.content_type,
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29 body=self.format(graph.node(node)))
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30
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31 def edge(self, request, graph, node1, node2):
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32 return Response(content_type=self.content_type,
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33 body=self.format(graph.edge(node1, node2)))
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34
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35 def graph(self, request, graph):
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36 return Response(content_type=self.content_type,
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37 body = self.format(graph()))
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39
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40 class Dispatcher(object):
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41
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42 def __init__(self, graph,
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43 graph_formatters,
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44 node_formatters,
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45 edge_formatters,
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46 require_auth=False):
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47 self.graph = graph
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48 self.require_auth = require_auth
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49
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50 # view formatters
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51 self.formatters = {GRAPH: graph_formatters,
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52 NODE: node_formatters,
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53 EDGE: edge_formatters}
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54 for key, value in self.formatters.items():
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55 # ensure default formatter
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56 assert None in value
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57 # ensure all formatters are callable
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58
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59 self.methods = dict([(i, getattr(self, i))
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60 for i in dir(self)
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61 if i.isupper()])
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62
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63 def __call__(self, environ, start_response):
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64 request = Request(environ)
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65 method = self.methods.get(request.method)
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66 if method is None:
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67 return exc.HTTPMethodNotAllowed()(environ, start_response)
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68 response = method(request)
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69 return response(environ, start_response)
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70
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71 @staticmethod
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72 def path_segments(path):
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73 """split a path into segments"""
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74 segments = path.strip('/').split('/')
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75 if segments == ['']:
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76 segments = []
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77 return segments
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78
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79
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80 def formatter(self, rank, request):
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81 """returns the formatter for a request"""
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82 formatters = self.formatters[rank]
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83 format = request.GET.get('format')
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84 return formatters.get(format, formatters[None])
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85
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86 # HTTP methods
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87
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88 def GET(self, request):
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89 """
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90 respond to a GET request
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91
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92 Formatters are keyed off of
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93
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94 formatters = {0: {
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95 }
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96
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97 A graph formatter takes the following arguments:
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98
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99 def sample_graph_formatter(graph, request):
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100
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101 A node formatter takes the following arguments:
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102
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103 def sample_node_formatter(node, graph, request):
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104
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105 An edge formatter takes the following arguments:
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106
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107 def sample_edge_formatter(edge, graph, request):
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108
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109 API:
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110
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111 ?format=<format>
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112
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113 """
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114
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115 # get resource requestor
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116 segments = self.path_segments(request.path_info)
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117 rank = len(segments)
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118 if rank not in (0,1,2):
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119 return exc.HTTPNotFound()
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120
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121 # is resource in the graph?
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122 if (rank == EDGE) or (rank == NODE):
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123 if tuple(segments) not in self.graph:
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124 return exc.HTTPNotFound()
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125
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126 # formatter
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127 formatter = self.formatter(rank, request)
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128 return formatter(request, self.graph, *segments)
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129
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130 def POST(self, request):
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131 """
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132 respond to a POST request
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133
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134 API:
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135
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136 ?update :
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137 """
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138
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139 # check authorization
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140 if self.require_auth:
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141 raise NotImplementedError
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142
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143 return exc.HTTPSeeOther(location='/') # TODO: /path/to/self
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144
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145 def HEAD(self, request):
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146 """respond to a HEAD request"""
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147 raise NotImplementedError
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148
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149 def OPTIONS(self, request):
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150 return Response() # TODO: Allow=', '.join(self.methods); Content-Length=0
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151
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152
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153 def main(args=sys.argv[1:]):
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154 """example web server"""
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155
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156 # imports
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157 from wsgiref import simple_server
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158 from model import MemoryCache
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159 from optparse import OptionParser
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160
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161 # parse command line options
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162 parser = OptionParser()
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163 parser.add_option('-p', '--port', type='int', default=8080,
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164 help="port to serve on")
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165 options, args = parser.parse_args()
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166
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167 # example model
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168 graph = MemoryCache()
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169
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170 # example formatter(s)
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171 formatter = JSONformatter(content_type='text/plain')
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172 _formatters = {}
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173 _formatters = dict([('%s_formatters' % i, {None: getattr(formatter, i)})
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174 for i in 'graph', 'node', 'edge'])
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175
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176 # WSGI app
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177 app = Dispatcher(graph=graph, **_formatters)
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178 server = simple_server.make_server(host='0.0.0.0', port=options.port, app=app)
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179 print 'http://localhost:%s/' % options.port
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180 server.serve_forever()
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181
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182 if __name__ == '__main__':
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183 main()