Mercurial > hg > WSGraph
annotate wsgraph/web.py @ 7:9016b126aa87
WIP
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Mon, 10 Dec 2012 13:55:58 -0800 |
| parents | 259210f2e029 |
| children | 421d5119e324 |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 """ | |
| 4 web handler for WSGraph | |
| 5 """ | |
| 6 | |
| 7 import json | |
| 8 from webob import Request, Response, exc | |
| 9 | |
| 5 | 10 # rank constants |
| 4 | 11 GRAPH = 0 |
| 12 NODE = 1 | |
| 13 EDGE = 2 | |
| 14 | |
| 5 | 15 # XXX stubbing hacks |
| 7 | 16 class JSONformatter(object): |
| 17 def __init__(self, sort_keys=True): | |
| 18 self.sort_keys = sort_keys | |
| 19 | |
| 20 def format(self, _object): | |
| 21 return json.dumps(graph.node(node), sort_keys=self.sort_keys) | |
| 22 | |
| 23 def node(self, node, graph, request): | |
| 24 return Response(body=self.format(graph.node(node))) | |
| 25 | |
| 6 | 26 def JSONFormatter(node, graph, request): |
| 27 return json.dumps(graph.node(node), sort_keys=True) | |
| 28 def JSONGraphFormatter(graph, request): | |
| 0 | 29 return json.dumps({'nodes': graph.nodes(), |
| 30 'edges': graph.edges()}, | |
| 31 sort_keys=True) | |
| 32 | |
| 33 class Dispatcher(object): | |
| 34 | |
| 35 def __init__(self, graph, | |
| 5 | 36 graph_formatters=None, |
| 37 node_formatters=None, | |
| 38 edge_formatters=None, | |
| 0 | 39 require_auth=False): |
| 40 self.graph = graph | |
| 41 self.require_auth = require_auth | |
| 5 | 42 |
| 43 # use JSON formatter by default | |
| 44 if graph_formatters is None: | |
| 45 graph_formatters = {None: JSONGraphFormatter} | |
| 46 if node_formatters is None: | |
| 47 node_formatters = {None: JSONFormatter} | |
| 48 if edge_formatters is None: | |
| 49 edge_formatters = {None: JSONFormatter} | |
| 50 | |
| 51 self.formatters = {GRAPH: graph_formatters, | |
| 52 NODE: node_formatters, | |
| 53 EDGE: edge_formatters} | |
| 54 for key, value in formatters.items(): | |
| 55 # ensure default formatter | |
| 56 assert None in value | |
| 0 | 57 |
| 3 | 58 self.methods = dict([(i, getattr(self, i)) |
| 59 for i in dir(self) | |
| 60 if i.isupper()]) | |
| 61 | |
| 0 | 62 def __call__(self, environ, start_response): |
| 63 request = Request(environ) | |
| 3 | 64 method = self.methods.get(request.method) |
| 65 if method is None: | |
| 66 return exc.HTTPMethodNotAllowed()(environ, start_response) | |
| 67 response = method(request) | |
| 0 | 68 return response(environ, start_response) |
| 69 | |
| 70 @staticmethod | |
| 5 | 71 def path_segments(path): |
| 72 """split a path into segments""" | |
| 73 segments = path.strip('/').split('/') | |
| 74 if segments == ['']: | |
| 75 segments = [] | |
| 76 return segments | |
| 0 | 77 |
| 78 # HTTP methods | |
| 79 | |
| 80 def GET(self, request): | |
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81 """ |
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82 respond to a GET request |
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83 |
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84 Formatters are keyed off of |
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85 |
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86 formatters = {0: { |
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87 } |
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88 |
| 4 | 89 A graph formatter takes the following arguments: |
| 90 | |
| 6 | 91 def sample_graph_formatter(graph, request): |
| 92 | |
| 93 A node formatter takes the following arguments: | |
| 94 | |
| 95 def sample_node_formatter(node, graph, request): | |
| 96 | |
| 97 An edge formatter takes the following arguments: | |
| 98 | |
| 99 def sample_edge_formatter(edge, graph, request): | |
| 4 | 100 |
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101 API: |
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102 |
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103 ?format=<format> |
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104 |
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105 """ |
| 0 | 106 |
| 7 | 107 # get resource requestor |
| 5 | 108 segments = self.path_segments(request.path_info) |
| 4 | 109 if len(segments) not in (0,1,2): |
| 110 return exc.HTTPNotFound() | |
| 0 | 111 |
| 7 | 112 |
| 113 # is resource in the graph? [TODO] | |
| 114 | |
| 0 | 115 # formatter |
| 116 formatter = self.formatters[len(segments)] | |
| 117 return Response(content_type='text/plain', | |
| 118 body="WSGraph") | |
| 119 | |
| 120 def POST(self, request): | |
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121 """ |
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122 respond to a POST request |
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123 |
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124 API: |
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125 |
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126 ?update : |
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127 """ |
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128 |
| 4 | 129 return exc.HTTPSeeOther(location='/') # TODO: /path/to/self |
| 0 | 130 |
| 131 def HEAD(self, request): | |
| 132 """respond to a HEAD request""" | |
| 133 raise NotImplementedError | |
| 134 | |
| 3 | 135 def OPTIONS(self, request): |
| 4 | 136 return Response() # TODO: Allow=', '.join(self.methods); Content-Length=0 |
| 3 | 137 |
| 0 | 138 if __name__ == '__main__': |
| 139 | |
| 3 | 140 ### example web server |
| 141 | |
| 0 | 142 # imports |
| 143 from wsgiref import simple_server | |
| 3 | 144 from model import MemoryCache |
| 145 from optparse import OptionParser | |
| 0 | 146 |
| 3 | 147 # parse command line options |
| 148 parser = OptionParser() | |
| 149 parser.add_option('-p', '--port', type='int', default=8080, | |
| 150 help="port to serve on") | |
| 151 options, args = parser.parse_args() | |
| 152 | |
| 153 # example model | |
| 0 | 154 graph = MemoryCache() |
| 155 | |
| 3 | 156 # WSGI app |
| 0 | 157 app = Dispatcher(graph=graph) |
| 3 | 158 server = simple_server.make_server(host='0.0.0.0', port=options.port, app=app) |
| 159 print 'http://localhost:%s/' % options.port | |
| 0 | 160 server.serve_forever() |
| 161 |