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direction.py
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direction.py
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#!/usr/bin/env python
#
# MetroTransit API
# Corey Maul (chmaul AT gmail DOT com)
#
# Copyright (c) 2009 Corey Maul
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#
import wsgiref.handlers
from google.appengine.ext import webapp
from google.appengine.api import urlfetch
from BeautifulSoup import BeautifulSoup
from google.appengine.api import memcache
from django.utils import simplejson as json
from jsonp import jsonp
directionURL = "http://metrotransit.org/Mobile/Nextrip.aspx?route="
def scrapeDirection(self, route) :
directions = []
result = urlfetch.fetch(directionURL + route)
if (result.status_code == 200):
soup = BeautifulSoup(result.content)
select = soup.html.body.find(id="ctl00_mainContent_NexTripControl1_ddlNexTripDirection")
options = select.findAll('option')
for x in options:
directionCode = int(x['value'])
if directionCode > 0:
directions.append({
'code': directionCode,
'name': x.string
})
return json.dumps(directions, sort_keys=True)
class MainHandler(webapp.RequestHandler):
def get(self):
try:
route = self.request.get('route')
if route == "":
raise ValueError
directions = memcache.get(route)
if directions is None:
directions = scrapeDirection(self, route)
memcache.add(route, directions, 60*60*24)
self.response.out.write(jsonp(self.request, directions))
except (ValueError, TypeError):
self.response.out.write("<html><body><h4>Invalid Input</h4><p>route is a required input.<br /><i>Example: /direction?route=4</i></p></body></html>")
def main():
application = webapp.WSGIApplication([('/direction', MainHandler)],
debug=True)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == '__main__':
main()