server.py

""".....code for the bus tracking system by the help of pyramid frame work....."""

from wsgiref.simple_server import make_server
from pyramid.config import Configurator
from pyramid.response import Response
from sqlalchemy import create_engine
from busroutes import BusRoute
from busroutes import Base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from pyramid.renderers import render
from pyramid.response import Response
from pyramid.view import view_config

DB_NAME = 'buses.db'

engine = create_engine('sqlite:///%s' % DB_NAME, echo=True)


"""to display the home page"""
def bus_routes(request):
    return Response('<form action="/response" method="POST">Enter the bus no<input type="text" name="bus_no"/><button type="submit">Search Bus</button></form>')

def get_session(engine):
    """
    Creates session object every single time this method is called
    """
    return sessionmaker(bind=engine)()


def fetch_bus_info(request):
    """route X are the lists containing the bus routes information."""
    # TODO: Dump these into the table in one shot.
    # route1=['Corporation','Chamrajpet','NR colony','Chikkallasandra']
    # route2=['Netkallappa circle','Chamrajpet','Navrang','Sujatha']
    # route3=['Gandhi Bazaar', 'Jayanagar 4th block', 'East End', 'BTM Layout']
    # route4=['Lalbagh', 'Nanda Theatre', 'Sangam Circle', 'Banashankari']

    """to fetch the data from the text box."""
    bus_no = request.params.get('bus_no', '')
    assert bus_no, 'Keyword expected as bus_no. Got nothing instead'
    Session = get_session(engine)
    results = Session.query(BusRoute).filter(BusRoute.bus_no==bus_no) 
    if results.count():
        bus_route = results.one()
        TEMPLATE_TEXT = "<b>Starting:{0}<br/>Ending:{1}<br/>Route Info:{2}".format(bus_route.start_point, bus_route.end_point, bus_route.route)
        return Response(TEMPLATE_TEXT)
    return Response("Invalid Bus No:%s" % bus_no)
        
    # ''.format()
    # print 'I am {0} and I\'m working with {1} and I am using {1} version no:{2}}'.format(('nanda', 'sqlalchemy', '0.9.4'))


    
    # if (bus_no=='210N'):
    #     return Response('<b>'"Starting"'</b>'+':'+"Majestic"+" "+'<br>''<b>'"Ending"'</b>'+':'+"Uttarahalli"+" "+'<br>''<b>' "Stops in the route: " '</b>'+'<br>' ' '.join(str(place) for place in route1))
    
    # elif (bus_no=='77B'):
    #      return Response('<b>'"Starting"'</b>'+':'+"NR colony"+" "+'<br>''<b>'"Ending"'</b>'+':'+"Mahalakshmi Layout"+" "+'<br>''<b>' "Stops in the route: " '</b>'+'<br>' ' '.join(str(place) for place in route2))
    # elif (bus_no=='3E'):
    #     return Response('<b>'"Starting"'</b>'+':'+"Banashankari 3rd stage"+" "+'<br>''<b>'"Ending"'</b>'+':'+"BTM layout"+" "+'<br>''<b>' "Stops in the route: " '</b>'+'<br>' ' '.join(str(place) for place in route3))
    # elif (bus_no=='12'):
    #     return Response('<b>'"Starting"'</b>'+':'+"KBS"+" "+'<br>''<b>'"Ending"'</b>'+':'+"Banashankari"+" "+'<br>''<b>' "Stops in the route: " '</b>'+'<br>' ' '.join(str(place) for place in route4))

    # else:
    #     return Response("Invalid")

def sample_view(request):
    result = render('templates/templates.pt',
                    {'start_point':'m','end_point':'u','route':'l'},
                    request=request)
    response = Response(result)
    return response

if __name__ == '__main__':
    config = Configurator()
    config.add_route('home', '/')
    config.add_view(bus_routes, route_name='home')
    config.add_route('bus', '/bus/')
    config.add_view(bus_routes, route_name='bus')
    config.add_route('bus_info', '/response')
    config.add_view(fetch_bus_info, route_name='bus_info')
    #config.scan('views')


    
    app = config.make_wsgi_app()
    server = make_server('0.0.0.0', 8083, app)
    server.serve_forever()