Mercurial > hg > WSGraph
annotate wsgraph/web.py @ 18:b710a2374c8d
more stubbing, goddamn content_type
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Mon, 10 Dec 2012 17:42:23 -0800 |
| parents | 1053290ba067 |
| children | 8162dc8dd93a |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 """ | |
| 4 web handler for WSGraph | |
| 5 """ | |
| 6 | |
| 7 import json | |
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8 import sys |
| 0 | 9 from webob import Request, Response, exc |
| 10 | |
| 5 | 11 # rank constants |
| 4 | 12 GRAPH = 0 |
| 13 NODE = 1 | |
| 14 EDGE = 2 | |
| 15 | |
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16 # XXX stubbing hack |
| 7 | 17 class JSONformatter(object): |
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18 |
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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 |
| 7 | 21 self.sort_keys = sort_keys |
| 22 | |
| 23 def format(self, _object): | |
| 24 return json.dumps(graph.node(node), sort_keys=self.sort_keys) | |
| 25 | |
| 26 def node(self, node, graph, request): | |
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27 return Response(content_type=self.content_type, |
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28 body=self.format(graph.node(node))) |
| 7 | 29 |
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30 def edge(self, node1, node2, graph, request): |
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31 return Response(content_type=self.content_type, |
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32 body=self.format(graph.edge(node))) |
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33 |
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34 def graph(self, graph, request): |
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35 return Response(content_type=self.content_type, |
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36 body='hello? is it me you\'re looking for?') |
| 0 | 37 |
| 38 class Dispatcher(object): | |
| 39 | |
| 40 def __init__(self, graph, | |
| 5 | 41 graph_formatters=None, |
| 42 node_formatters=None, | |
| 43 edge_formatters=None, | |
| 0 | 44 require_auth=False): |
| 45 self.graph = graph | |
| 46 self.require_auth = require_auth | |
| 5 | 47 |
| 48 # use JSON formatter by default | |
| 49 if graph_formatters is None: | |
| 50 graph_formatters = {None: JSONGraphFormatter} | |
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51 if node_formatters is None: |
| 5 | 52 node_formatters = {None: JSONFormatter} |
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53 if edge_formatters is None: |
| 5 | 54 edge_formatters = {None: JSONFormatter} |
| 55 | |
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56 # view formatters |
| 5 | 57 self.formatters = {GRAPH: graph_formatters, |
| 58 NODE: node_formatters, | |
| 59 EDGE: edge_formatters} | |
| 16 | 60 for key, value in self.formatters.items(): |
| 5 | 61 # ensure default formatter |
| 62 assert None in value | |
| 0 | 63 |
| 3 | 64 self.methods = dict([(i, getattr(self, i)) |
| 65 for i in dir(self) | |
| 66 if i.isupper()]) | |
| 67 | |
| 0 | 68 def __call__(self, environ, start_response): |
| 69 request = Request(environ) | |
| 3 | 70 method = self.methods.get(request.method) |
| 71 if method is None: | |
| 72 return exc.HTTPMethodNotAllowed()(environ, start_response) | |
| 73 response = method(request) | |
| 0 | 74 return response(environ, start_response) |
| 75 | |
| 76 @staticmethod | |
| 5 | 77 def path_segments(path): |
| 78 """split a path into segments""" | |
| 79 segments = path.strip('/').split('/') | |
| 80 if segments == ['']: | |
| 81 segments = [] | |
| 82 return segments | |
| 0 | 83 |
| 84 # HTTP methods | |
| 85 | |
| 86 def GET(self, request): | |
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87 """ |
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88 respond to a GET request |
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89 |
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90 Formatters are keyed off of |
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91 |
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92 formatters = {0: { |
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93 } |
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94 |
| 4 | 95 A graph formatter takes the following arguments: |
| 96 | |
| 6 | 97 def sample_graph_formatter(graph, request): |
| 98 | |
| 99 A node formatter takes the following arguments: | |
| 100 | |
| 101 def sample_node_formatter(node, graph, request): | |
| 102 | |
| 103 An edge formatter takes the following arguments: | |
| 104 | |
| 105 def sample_edge_formatter(edge, graph, request): | |
| 4 | 106 |
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107 API: |
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108 |
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109 ?format=<format> |
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110 |
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111 """ |
| 0 | 112 |
| 7 | 113 # get resource requestor |
| 5 | 114 segments = self.path_segments(request.path_info) |
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115 rank = len(segments) |
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parents:
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116 if rank not in (0,1,2): |
| 4 | 117 return exc.HTTPNotFound() |
| 0 | 118 |
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parents:
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119 # is resource in the graph? |
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120 if (rank == EDGE) or (rank == NODE): |
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421d5119e324
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parents:
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121 if tuple(segments) not in self.graph: |
| 14 | 122 return exc.HTTPNotFound() |
| 7 | 123 |
| 0 | 124 # formatter |
| 125 formatter = self.formatters[len(segments)] | |
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126 return formatter(*segments, self.graph, request) |
| 0 | 127 return Response(content_type='text/plain', |
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128 body=content) |
| 0 | 129 |
| 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 |
| 4 | 139 return exc.HTTPSeeOther(location='/') # TODO: /path/to/self |
| 0 | 140 |
| 141 def HEAD(self, request): | |
| 142 """respond to a HEAD request""" | |
| 143 raise NotImplementedError | |
| 144 | |
| 3 | 145 def OPTIONS(self, request): |
| 4 | 146 return Response() # TODO: Allow=', '.join(self.methods); Content-Length=0 |
| 3 | 147 |
| 0 | 148 |
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149 def main(args=sys.argv[1:]): |
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parents:
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150 """example web server""" |
| 3 | 151 |
| 0 | 152 # imports |
| 153 from wsgiref import simple_server | |
| 3 | 154 from model import MemoryCache |
| 155 from optparse import OptionParser | |
| 0 | 156 |
| 3 | 157 # parse command line options |
| 158 parser = OptionParser() | |
| 159 parser.add_option('-p', '--port', type='int', default=8080, | |
| 160 help="port to serve on") | |
| 161 options, args = parser.parse_args() | |
| 162 | |
| 163 # example model | |
| 0 | 164 graph = MemoryCache() |
| 165 | |
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166 # example formatter(s) |
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167 # TODO |
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168 |
| 3 | 169 # WSGI app |
| 0 | 170 app = Dispatcher(graph=graph) |
| 3 | 171 server = simple_server.make_server(host='0.0.0.0', port=options.port, app=app) |
| 172 print 'http://localhost:%s/' % options.port | |
| 0 | 173 server.serve_forever() |
| 174 | |
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175 if __name__ == '__main__': |
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parents:
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176 main() |