Mercurial > hg > GlobalNeighbors

annotate globalneighbors/web.py @ 10:21ed15391e8a

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add a placeholder view for a city based on geoid
author Jeff Hammel <k0scist@gmail.com>
date Sun, 25 Jun 2017 12:28:36 -0700
parents 254195d0bac2
children d1b99c695511
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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 here = os.path.dirname(os.path.abspath(__file__))
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25 static_dir = os.path.join(here, 'static')
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26
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28 class PassthroughFileserver(object):
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29
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30 """serve files if they exist"""
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32
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33 def __init__(self, app, directory=static_dir):
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34 self.app = app
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35 self.directory = directory
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36 self.fileserver = StaticURLParser(self.directory)
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37
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38 def __call__(self, environ, start_response):
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39
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40 path = environ['PATH_INFO'].strip('/')
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41
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42 if path and os.path.exists(os.path.join(self.directory, path)) and '..' not in path:
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43
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44 return self.fileserver(environ, start_response)
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45 return self.app(environ, start_response)
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48 def autocomplete(cities, startswith=None, limit=None):
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49 """autocomplete function for city names"""
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50 ### TODO:
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51 # - sort once, ahead of time
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52 # - return most populous cities
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53
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54 if startswith:
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55 retval = []
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56 for i in cities:
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57 if i[name].startswith(startswith):
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58 retval.append(i[name])
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59 return sorted(retval)[:limit]
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60 else:
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61 return sorted([i[name] for i in cities])[:limit]
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62
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63
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64 class Handler(object):
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65 """base class for HTTP handler"""
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66
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67 def __call__(self, environ, start_response):
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68 request = Request(environ)
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69 method = getattr(self, request.method, None)
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70 response = None
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71 if method is not None:
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72 response = method(request)
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73 if response is None:
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74 response = exc.HTTPNotFound()
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75 return response(environ, start_response)
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77
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78 class CitiesHandler(Handler):
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79 """cities ReST API"""
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80
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81 content_type = 'application/json'
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82
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83 def __init__(self, locations, cities):
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84 self.locations = locations
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85 self._cities = cities
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86
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87
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88 def cities(self, startswith=None):
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89 """return list of cities"""
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90 return autocomplete(self._cities.values(),
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91 startswith=startswith)
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92
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93 def GET(self, request):
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94 return Response(content_type=self.content_type,
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95 body=json.dumps(self.cities(
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96 startswith=request.GET.get('term'))))
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98
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99 class GlobalHandler(Handler):
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100 """WSGI HTTP Handler"""
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101
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102 content_type = 'text/html'
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103
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104 def __init__(self, datafile, template_dir=template_dir):
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105
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106
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107 # parse data
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108 self.datafile = datafile
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109 self.cities = read_city_list(self.datafile,
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110 fields=fields)
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111 self.locations = locations(self.cities)
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112
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113 # convert cities to a dict for lookup
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114 self.cities = {city['geonameid'] : city
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115 for city in self.cities}
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116
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117 # declare handlers
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118 self.handlers = {'/cities':
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119 CitiesHandler(self.locations,
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120 self.cities)}
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121
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122 # template loader
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123 self.loader = TemplateLoader(template_dir)
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124 self.index = self.loader.load('index.html')
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125 self.citypage = self.loader.load('city.html')
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126
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127
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128 def GET(self, request):
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129 if request.path_info in ('', '/'):
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130 # Landing page
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131 return Response(content_type=self.content_type,
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132 body=self.index.render(n_cities=len(self.cities)))
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133 elif request.path_info in self.handlers:
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134 return request.get_response(self.handlers[request.path_info])
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135 else:
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136 try:
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137 geoid = int(request.path.strip('/'))
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138 city = self.cities.get(geoid)
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139 if not city:
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140 return
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141 return Response(content_type=self.content_type,
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142 body=self.citypage.render(**city))
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143 except ValueError:
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144 pass
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148 def main(args=sys.argv[1:]):
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149 """CLI"""
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150
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151 # parse command line
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152 parser = argparse.ArgumentParser(description=__doc__)
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153 parser.add_argument('cities',
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154 help="cities1000 data file")
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155 parser.add_argument('-p', '--port', dest='port',
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156 type=int, default=8080,
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157 help="port to serve on")
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158 parser.add_argument('--hostname', dest='hostname',
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159 default='localhost',
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160 help="host name [DEFAULT: %(default)s]")
0
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161 options = parser.parse_args(args)
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162
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163 # instantiate WSGI handler
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164 app = GlobalHandler(datafile=options.cities)
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165
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166 # serve it (Warning! Single threaded!)
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167 server = simple_server.make_server(host='0.0.0.0',
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168 port=options.port,
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169 app=app)
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170 try:
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171 print ("Serving on http://{hostname}:{port}/".format(**options.__dict__))
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172 server.serve_forever()
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173 except KeyboardInterrupt:
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174 pass
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175
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176
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177 if __name__ == '__main__':
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178 main()
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179