Mercurial > hg > WSGraph
annotate wsgraph/web.py @ 17:1053290ba067
finish up this throwaway thing
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Mon, 10 Dec 2012 17:36:31 -0800 |
| parents | 569a5d93b8e3 |
| children | b710a2374c8d |
| 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 | |
| 5 | 16 # XXX stubbing hacks |
| 7 | 17 class JSONformatter(object): |
| 18 def __init__(self, sort_keys=True): | |
| 19 self.sort_keys = sort_keys | |
| 20 | |
| 21 def format(self, _object): | |
| 22 return json.dumps(graph.node(node), sort_keys=self.sort_keys) | |
| 23 | |
| 24 def node(self, node, graph, request): | |
| 25 return Response(body=self.format(graph.node(node))) | |
| 26 | |
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27 def edge(self, node1, node2, graph, request): |
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28 return Response(body=self.format(graph.edge(node))) |
| 0 | 29 |
| 30 class Dispatcher(object): | |
| 31 | |
| 32 def __init__(self, graph, | |
| 5 | 33 graph_formatters=None, |
| 34 node_formatters=None, | |
| 35 edge_formatters=None, | |
| 0 | 36 require_auth=False): |
| 37 self.graph = graph | |
| 38 self.require_auth = require_auth | |
| 5 | 39 |
| 40 # use JSON formatter by default | |
| 41 if graph_formatters is None: | |
| 42 graph_formatters = {None: JSONGraphFormatter} | |
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43 if node_formatters is None: |
| 5 | 44 node_formatters = {None: JSONFormatter} |
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45 if edge_formatters is None: |
| 5 | 46 edge_formatters = {None: JSONFormatter} |
| 47 | |
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48 # view formatters |
| 5 | 49 self.formatters = {GRAPH: graph_formatters, |
| 50 NODE: node_formatters, | |
| 51 EDGE: edge_formatters} | |
| 16 | 52 for key, value in self.formatters.items(): |
| 5 | 53 # ensure default formatter |
| 54 assert None in value | |
| 0 | 55 |
| 3 | 56 self.methods = dict([(i, getattr(self, i)) |
| 57 for i in dir(self) | |
| 58 if i.isupper()]) | |
| 59 | |
| 0 | 60 def __call__(self, environ, start_response): |
| 61 request = Request(environ) | |
| 3 | 62 method = self.methods.get(request.method) |
| 63 if method is None: | |
| 64 return exc.HTTPMethodNotAllowed()(environ, start_response) | |
| 65 response = method(request) | |
| 0 | 66 return response(environ, start_response) |
| 67 | |
| 68 @staticmethod | |
| 5 | 69 def path_segments(path): |
| 70 """split a path into segments""" | |
| 71 segments = path.strip('/').split('/') | |
| 72 if segments == ['']: | |
| 73 segments = [] | |
| 74 return segments | |
| 0 | 75 |
| 76 # HTTP methods | |
| 77 | |
| 78 def GET(self, request): | |
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79 """ |
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80 respond to a GET request |
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81 |
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82 Formatters are keyed off of |
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83 |
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84 formatters = {0: { |
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85 } |
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86 |
| 4 | 87 A graph formatter takes the following arguments: |
| 88 | |
| 6 | 89 def sample_graph_formatter(graph, request): |
| 90 | |
| 91 A node formatter takes the following arguments: | |
| 92 | |
| 93 def sample_node_formatter(node, graph, request): | |
| 94 | |
| 95 An edge formatter takes the following arguments: | |
| 96 | |
| 97 def sample_edge_formatter(edge, graph, request): | |
| 4 | 98 |
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99 API: |
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100 |
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101 ?format=<format> |
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102 |
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103 """ |
| 0 | 104 |
| 7 | 105 # get resource requestor |
| 5 | 106 segments = self.path_segments(request.path_info) |
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parents:
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107 rank = len(segments) |
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parents:
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108 if rank not in (0,1,2): |
| 4 | 109 return exc.HTTPNotFound() |
| 0 | 110 |
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111 # is resource in the graph? |
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112 if (rank == EDGE) or (rank == NODE): |
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421d5119e324
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parents:
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113 if tuple(segments) not in self.graph: |
| 14 | 114 return exc.HTTPNotFound() |
| 7 | 115 |
| 0 | 116 # formatter |
| 117 formatter = self.formatters[len(segments)] | |
| 118 return Response(content_type='text/plain', | |
| 119 body="WSGraph") | |
| 120 | |
| 121 def POST(self, request): | |
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122 """ |
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123 respond to a POST request |
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124 |
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125 API: |
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126 |
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127 ?update : |
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128 """ |
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129 |
| 4 | 130 return exc.HTTPSeeOther(location='/') # TODO: /path/to/self |
| 0 | 131 |
| 132 def HEAD(self, request): | |
| 133 """respond to a HEAD request""" | |
| 134 raise NotImplementedError | |
| 135 | |
| 3 | 136 def OPTIONS(self, request): |
| 4 | 137 return Response() # TODO: Allow=', '.join(self.methods); Content-Length=0 |
| 3 | 138 |
| 0 | 139 |
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12
421d5119e324
reluctantly make this a CLI entry point
Jeff Hammel <jhammel@mozilla.com>
parents:
7
diff
changeset
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140 def main(args=sys.argv[1:]): |
|
421d5119e324
reluctantly make this a CLI entry point
Jeff Hammel <jhammel@mozilla.com>
parents:
7
diff
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141 """example web server""" |
| 3 | 142 |
| 0 | 143 # imports |
| 144 from wsgiref import simple_server | |
| 3 | 145 from model import MemoryCache |
| 146 from optparse import OptionParser | |
| 0 | 147 |
| 3 | 148 # parse command line options |
| 149 parser = OptionParser() | |
| 150 parser.add_option('-p', '--port', type='int', default=8080, | |
| 151 help="port to serve on") | |
| 152 options, args = parser.parse_args() | |
| 153 | |
| 154 # example model | |
| 0 | 155 graph = MemoryCache() |
| 156 | |
| 3 | 157 # WSGI app |
| 0 | 158 app = Dispatcher(graph=graph) |
| 3 | 159 server = simple_server.make_server(host='0.0.0.0', port=options.port, app=app) |
| 160 print 'http://localhost:%s/' % options.port | |
| 0 | 161 server.serve_forever() |
| 162 | |
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12
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parents:
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163 if __name__ == '__main__': |
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421d5119e324
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parents:
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164 main() |