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- #!/usr/bin/env python
- """Event Man(ager)
- Your friendly manager of attendants at a conference.
- """
- import os
- import json
- import datetime
- import tornado.httpserver
- import tornado.ioloop
- import tornado.options
- from tornado.options import define, options
- import tornado.web
- from tornado import gen, escape
- import backend
- class ImprovedEncoder(json.JSONEncoder):
- """Enhance the default JSON encoder to serialize datetime objects."""
- def default(self, o):
- if isinstance(o, (datetime.datetime, datetime.date,
- datetime.time, datetime.timedelta)):
- return str(o)
- return json.JSONEncoder.default(self, o)
- json._default_encoder = ImprovedEncoder()
- class BaseHandler(tornado.web.RequestHandler):
- """Base class for request handlers."""
- def initialize(self, **kwargs):
- """Add every passed (key, value) as attributes of the instance."""
- for key, value in kwargs.iteritems():
- setattr(self, key, value)
- class RootHandler(BaseHandler):
- """Handler for the / path."""
- angular_app_path = os.path.join(os.path.dirname(__file__), "angular_app")
- @gen.coroutine
- def get(self):
- # serve the ./angular_app/index.html file
- with open(self.angular_app_path + "/index.html", 'r') as fd:
- self.write(fd.read())
- class CollectionHandler(BaseHandler):
- """Base class for handlers that need to interact with the database backend.
-
- Introduce basic CRUD operations."""
- # set of documents we're managing (a collection in MongoDB or a table in a SQL database)
- collection = None
- @gen.coroutine
- def get(self, id_=None):
- if id_ is not None:
- # read a single document
- self.write(self.db.get(self.collection, id_))
- else:
- # return an object containing the list of all objects in the collection;
- # e.g.: {'events': [{'_id': 'obj1-id, ...}, {'_id': 'obj2-id, ...}, ...]}
- # Please, never return JSON lists that are not encapsulated in an object,
- # to avoid XSS vulnerabilities.
- self.write({self.collection: self.db.query(self.collection)})
- @gen.coroutine
- def post(self, id_=None, **kwargs):
- data = escape.json_decode(self.request.body or {})
- if id_ is None:
- # insert a new document
- newData = self.db.add(self.collection, data)
- else:
- # update an existing document
- newData = self.db.update(self.collection, id_, data)
- self.write(newData)
- # PUT is handled by the POST method
- put = post
- class PersonsHandler(CollectionHandler):
- """Handle requests for Persons."""
- collection = 'persons'
- class EventsHandler(CollectionHandler):
- """Handle requests for Events."""
- collection = 'events'
- def run():
- """Run the Tornado web application."""
- # command line arguments; can also be written in a configuration file,
- # specified with the --config argument.
- define("port", default=5242, help="run on the given port", type=int)
- define("data", default=os.path.join(os.path.dirname(__file__), "data"),
- help="specify the directory used to store the data")
- define("mongodbURL", default=None,
- help="URL to MongoDB server", type=str)
- define("dbName", default='eventman',
- help="Name of the MongoDB database to use", type=str)
- define("debug", default=False, help="run in debug mode")
- define("config", help="read configuration file",
- callback=lambda path: tornado.options.parse_config_file(path, final=False))
- tornado.options.parse_command_line()
- # database backend connector
- db_connector = backend.EventManDB(url=options.mongodbURL, dbName=options.dbName)
- init_params = dict(db=db_connector)
- application = tornado.web.Application([
- (r"/persons/?(?P<id_>\w+)?", PersonsHandler, init_params),
- (r"/events/?(?P<id_>\w+)?", EventsHandler, init_params),
- (r"/(?:index.html)?", RootHandler, init_params),
- (r'/(.*)', tornado.web.StaticFileHandler, {"path": "angular_app"})
- ],
- template_path=os.path.join(os.path.dirname(__file__), "templates"),
- static_path=os.path.join(os.path.dirname(__file__), "static"),
- debug=options.debug)
- http_server = tornado.httpserver.HTTPServer(application)
- http_server.listen(options.port)
- tornado.ioloop.IOLoop.instance().start()
- if __name__ == '__main__':
- run()
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