Mercurial > hg > GlobalNeighbors

annotate globalneighbors/web.py @ 4:8e130b7bfed9

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remove unintended boilerplate
author Jeff Hammel <k0scist@gmail.com>
date Sat, 24 Jun 2017 14:48:55 -0700
parents 1b94f3bf97e5
children 316e1d54ffd4
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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 GlobalNeighbors
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5 """
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6
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7 # imports
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8 import argparse
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9 import json
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10 import sys
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11 import time
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12 from webob import Request, Response, exc
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13 from wsgiref import simple_server
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14 from .locations import locations
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15 from .locations import city_dict
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16 from .read import read_cities
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17 from .read import read_city_list
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18 from .schema import fields
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19 from .schema import name
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20
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21
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22 def autocomplete(cities, startswith=None):
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23 """autocomplete function for city names"""
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24 ### TODO: sort once, ahead of time
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25
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26 if startswith:
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27 retval = []
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28 for i in cities:
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29 try:
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30 if i[name].startswith(startswith):
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31 retval.append(i[name])
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32 except Exception as e:
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33 import pdb; pdb.set_trace()
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34 return sorted(retval)
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35 else:
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36 return sorted([i[name] for i in cities])
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37
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38
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39 class Handler(object):
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40 """base class for HTTP handler"""
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41
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42 def __call__(self, environ, start_response):
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43 request = Request(environ)
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44 method = getattr(self, request.method, None)
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45 response = None
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46 if method is not None:
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47 response = method(request)
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48 if response is None:
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49 response = exc.HTTPNotFound()
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50 return response(environ, start_response)
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51
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52
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53 class CitiesHandler(Handler):
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54 """cities ReST API"""
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55
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56 content_type = 'application/json'
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57
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58 def __init__(self, locations, cities):
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59 self.locations = locations
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60 self._cities = cities
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61
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62
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63 def cities(self, startswith=None):
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64 """return list of cities"""
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65 return autocomplete(self._cities,
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66 startswith=startswith)
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67
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68 def GET(self, request):
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69 return Response(content_type=self.content_type,
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70 body=json.dumps(self.cities(
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71 startswith=request.GET.get('q'))))
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72
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73
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74 class GlobalHandler(Handler):
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75 """WSGI HTTP Handler"""
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76
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77 content_type = 'text/plain'
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78
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79 def __init__(self, datafile):
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80 self.datafile = datafile
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81
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82 # parse data
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83 self.cities = read_city_list(self.datafile,
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84 fields=fields)
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85 self.locations = locations(self.cities)
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86
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87 # TODO: declare handlers
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88 self.handlers = {'/cities':
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89 CitiesHandler(self.locations,
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90 self.cities)}
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91
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92
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93 def GET(self, request):
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94 if request.path_info in ('', '/'):
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95 # Landing page
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96 return Response(content_type=self.content_type,
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97 body="""Global Neighbors
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98 Serving {} cities""".format(len(self.cities)))
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99 else:
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100 handler = self.handlers.get(request.path_info)
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101 if handler:
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102 return request.get_response(handler)
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103
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104
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105
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106 def main(args=sys.argv[1:]):
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107 """CLI"""
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108
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109 # parse command line
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110 parser = argparse.ArgumentParser(description=__doc__)
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111 parser.add_argument('cities',
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112 help="cities1000 data file")
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113 parser.add_argument('-p', '--port', dest='port',
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114 type=int, default=8080,
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115 help="port to serve on")
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116 parser.add_argument('--hostname', dest='hostname',
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117 default='localhost',
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118 help="host name [DEFAULT: %(default)]")
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119 options = parser.parse_args(args)
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120
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121 # instantiate WSGI handler
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122 app = GlobalHandler(datafile=options.cities)
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123
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124 # serve it (Warning! Single threaded!)
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125 server = simple_server.make_server(host='0.0.0.0',
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126 port=options.port,
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127 app=app)
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128 try:
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129 print ("Serving on http://{hostname}:{port}/".format(**options.__dict__))
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130 server.serve_forever()
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131 except KeyboardInterrupt:
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132 pass
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133
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134
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135 if __name__ == '__main__':
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136 main()
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137