Mercurial > hg > GlobalNeighbors

annotate globalneighbors/web.py @ 8:e3d6919130ca

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author Jeff Hammel <k0scist@gmail.com>
date Sun, 25 Jun 2017 11:21:28 -0700
parents 254195d0bac2
children 21ed15391e8a
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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 os
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11 import sys
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12 import time
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13 from webob import Request, Response, exc
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14 from wsgiref import simple_server
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15 from .locations import locations
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16 from .locations import city_dict
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17 from .read import read_cities
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18 from .read import read_city_list
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19 from .schema import fields
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20 from .schema import name
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21 from .template import template_dir
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22 from .template import TemplateLoader
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24
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25 def autocomplete(cities, startswith=None, limit=None):
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26 """autocomplete function for city names"""
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27 ### TODO:
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28 # - sort once, ahead of time
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29 # - return most populous cities
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30
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31 if startswith:
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32 retval = []
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33 for i in cities:
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34 if i[name].startswith(startswith):
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35 retval.append(i[name])
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36 return sorted(retval)[:limit]
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37 else:
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38 return sorted([i[name] for i in cities])[:limit]
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41 class Handler(object):
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42 """base class for HTTP handler"""
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43
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44 def __call__(self, environ, start_response):
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45 request = Request(environ)
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46 method = getattr(self, request.method, None)
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47 response = None
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48 if method is not None:
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49 response = method(request)
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50 if response is None:
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51 response = exc.HTTPNotFound()
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52 return response(environ, start_response)
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54
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55 class CitiesHandler(Handler):
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56 """cities ReST API"""
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57
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58 content_type = 'application/json'
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59
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60 def __init__(self, locations, cities):
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61 self.locations = locations
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62 self._cities = cities
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63
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64
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65 def cities(self, startswith=None):
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66 """return list of cities"""
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67 return autocomplete(self._cities,
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68 startswith=startswith)
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70 def GET(self, request):
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71 return Response(content_type=self.content_type,
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72 body=json.dumps(self.cities(
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73 startswith=request.GET.get('term'))))
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75
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76 class GlobalHandler(Handler):
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77 """WSGI HTTP Handler"""
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78
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79 content_type = 'text/html'
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80
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81 def __init__(self, datafile, template_dir=template_dir):
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82
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83
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84 # parse data
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85 self.datafile = datafile
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86 self.cities = read_city_list(self.datafile,
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87 fields=fields)
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88 self.locations = locations(self.cities)
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89
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90 # declare handlers
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91 self.handlers = {'/cities':
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92 CitiesHandler(self.locations,
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93 self.cities)}
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94
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95 # template loader
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96 self.loader = TemplateLoader(template_dir)
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97 self.index = self.loader.load('index.html')
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98
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99
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100 def GET(self, request):
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101 if request.path_info in ('', '/'):
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102 # Landing page
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103 return Response(content_type=self.content_type,
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104 body=self.index.render(n_cities=len(self.cities)))
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105 else:
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106 handler = self.handlers.get(request.path_info)
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107 if handler:
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108 return request.get_response(handler)
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109
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111
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112 def main(args=sys.argv[1:]):
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113 """CLI"""
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114
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115 # parse command line
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116 parser = argparse.ArgumentParser(description=__doc__)
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117 parser.add_argument('cities',
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118 help="cities1000 data file")
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119 parser.add_argument('-p', '--port', dest='port',
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120 type=int, default=8080,
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121 help="port to serve on")
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122 parser.add_argument('--hostname', dest='hostname',
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123 default='localhost',
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124 help="host name [DEFAULT: %(default)s]")
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125 options = parser.parse_args(args)
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126
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127 # instantiate WSGI handler
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128 app = GlobalHandler(datafile=options.cities)
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129
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130 # serve it (Warning! Single threaded!)
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131 server = simple_server.make_server(host='0.0.0.0',
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132 port=options.port,
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133 app=app)
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134 try:
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135 print ("Serving on http://{hostname}:{port}/".format(**options.__dict__))
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136 server.serve_forever()
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137 except KeyboardInterrupt:
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138 pass
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139
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140
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141 if __name__ == '__main__':
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142 main()
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143