Mercurial > hg > GlobalNeighbors

annotate globalneighbors/web.py @ 12:6d89ea94930b

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add passthrough fileserver for autocomplete
author Jeff Hammel <k0scist@gmail.com>
date Sun, 25 Jun 2017 13:18:13 -0700
parents d1b99c695511
children 94af113e498a
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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 paste import httpserver
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14 from paste.urlparser import StaticURLParser
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15 from webob import Request, Response, exc
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16 from wsgiref import simple_server
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17 from .locations import locations
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18 from .locations import city_dict
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19 from .read import read_cities
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20 from .read import read_city_list
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21 from .schema import fields
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22 from .schema import name
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23 from .template import template_dir
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24 from .template import TemplateLoader
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26 here = os.path.dirname(os.path.abspath(__file__))
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27 static_dir = os.path.join(here, 'static')
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30 class PassthroughFileserver(object):
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31
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32 """serve files if they exist"""
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33
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34
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35 def __init__(self, app, directory=static_dir):
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36 self.app = app
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37 self.directory = directory
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38 self.fileserver = StaticURLParser(self.directory)
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39
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40 def __call__(self, environ, start_response):
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41
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42 path = environ['PATH_INFO'].strip('/')
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43
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44 if path and os.path.exists(os.path.join(self.directory, path)) and '..' not in path:
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45
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46 return self.fileserver(environ, start_response)
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47 return self.app(environ, start_response)
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48
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50 def autocomplete(cities, startswith=None, limit=None):
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51 """autocomplete function for city names"""
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52 ### TODO:
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53 # - sort once, ahead of time
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54 # - return most populous cities
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55
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56 if startswith:
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57 retval = []
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58 for i in cities:
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59 if i[name].startswith(startswith):
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60 retval.append(i[name])
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61 return sorted(retval)[:limit]
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62 else:
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63 return sorted([i[name] for i in cities])[:limit]
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64
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65
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66 class Handler(object):
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67 """base class for HTTP handler"""
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68
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69 def __call__(self, environ, start_response):
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70 request = Request(environ)
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71 method = getattr(self, request.method, None)
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72 response = None
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73 if method is not None:
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74 response = method(request)
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75 if response is None:
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76 response = exc.HTTPNotFound()
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77 return response(environ, start_response)
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80 class CitiesHandler(Handler):
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81 """cities ReST API"""
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82
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83 content_type = 'application/json'
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84
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85 def __init__(self, locations, cities):
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86 self.locations = locations
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87 self._cities = cities
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89
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90 def cities(self, startswith=None):
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91 """return list of cities"""
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92 return autocomplete(self._cities.values(),
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93 startswith=startswith)
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95 def GET(self, request):
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96 return Response(content_type=self.content_type,
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97 body=json.dumps(self.cities(
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98 startswith=request.GET.get('term'))))
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100
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101 class GlobalHandler(Handler):
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102 """WSGI HTTP Handler"""
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103
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104 content_type = 'text/html'
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105
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106 def __init__(self, datafile, template_dir=template_dir):
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107
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108
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109 # parse data
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110 self.datafile = datafile
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111 self.cities = read_city_list(self.datafile,
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112 fields=fields)
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113 self.locations = locations(self.cities)
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114
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115 # convert cities to a dict for lookup
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116 self.cities = {city['geonameid'] : city
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117 for city in self.cities}
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118
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119 # declare handlers
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120 self.handlers = {'/cities':
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121 CitiesHandler(self.locations,
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122 self.cities)}
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123
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124 # template loader
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125 self.loader = TemplateLoader(template_dir)
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126 self.index = self.loader.load('index.html')
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127 self.citypage = self.loader.load('city.html')
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128
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129
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130 def GET(self, request):
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131 if request.path_info in ('', '/'):
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132 # Landing page
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133 return Response(content_type=self.content_type,
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134 body=self.index.render(n_cities=len(self.cities)))
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135 elif request.path_info in self.handlers:
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136 return request.get_response(self.handlers[request.path_info])
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137 else:
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138 try:
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139 geoid = int(request.path.strip('/'))
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140 city = self.cities.get(geoid)
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141 if not city:
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142 return
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143 return Response(content_type=self.content_type,
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144 body=self.citypage.render(**city))
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145 except ValueError:
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146 pass
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149
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150 def main(args=sys.argv[1:]):
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151 """CLI"""
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152
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153 # parse command line
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154 parser = argparse.ArgumentParser(description=__doc__)
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155 parser.add_argument('cities',
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156 help="cities1000 data file")
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157 parser.add_argument('-p', '--port', dest='port',
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158 type=int, default=8080,
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159 help="port to serve on")
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160 parser.add_argument('--hostname', dest='hostname',
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161 default='localhost',
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162 help="host name [DEFAULT: %(default)s]")
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163 options = parser.parse_args(args)
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164
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165 # instantiate WSGI handler
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166 app = GlobalHandler(datafile=options.cities)
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167
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168 # wrap it in a static file server
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169 app = PassthroughFileserver(app)
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170
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171 print ("Serving on http://{hostname}:{port}/".format(**options.__dict__))
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172 try:
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173 httpserver.serve(app, host='0.0.0.0', port=options.port)
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174 except KeyboardInterrupt:
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175 pass
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176
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177
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178 if __name__ == '__main__':
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179 main()