Cannot get the GAE scripts posted in the web to work

by **bobg** » Mon Jun 22, 2009 6:33 pm

I ran throught he GAE tutorial and successfully got a test app to load so I at least know my GAE project site is working. However, when I use the python scripts posted on the web instructions and upload them to GAE, I get a server error message when I attempt to access the project space (http://1532barton.appspot.com). Needless to say I am a novice to both python and GAE so any help would be greatly appreicated. Note I also tried the R5 release in cvs tree and had similar problems.

Here's the code I am using (from your web step-by-step guide):

import cgi, datetime

from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db

class Powerusage(db.Model):
author = db.UserProperty() # the user
sensornum = db.IntegerProperty() # can have multiple sensors
watt = db.FloatProperty() # each sending us latest Watt measurement
date = db.DateTimeProperty(auto_now_add=True) # timestamp
#
# end of section 1
#
class PowerUpdate(webapp.RequestHandler):
def get(self):

# make the user log in
if not users.get_current_user():
self.redirect(users.create_login_url(self.request.uri))

powerusage = Powerusage()

if users.get_current_user():
powerusage.author = users.get_current_user()
#print self.request
if self.request.get('watt'):
powerusage.watt = float(self.request.get('watt'))
else:
self.response.out.write('Couldnt find \'watt\' GET property!')
return
if self.request.get('sensornum'):
powerusage.sensornum = int(self.request.get('sensornum'))
else:
powerusage.sensornum = 0 # assume theres just one or something

powerusage.put()
self.response.out.write('OK!')
#
# end of section 2
#
class DumpData(webapp.RequestHandler):
def get(self):

# make the user log in
if not users.get_current_user():
self.redirect(users.create_login_url(self.request.uri))

self.response.out.write('<html><body>Here is all the data you have sent us:')

powerusages = db.GqlQuery("SELECT * FROM Powerusage WHERE author = :1 ORDER BY date", users.get_current_user())

for powerused in powerusages:
if powerused.sensornum:
self.response.out.write('%s\'s sensor #%d' %
(powerused.author.nickname(), powerused.sensornum))
else:
self.response.out.write(%s' % powerused.author.nickname())

self.response.out.write(' used: %f Watts at %s' % (powerused.watt, powerused.date))
self.response.out.write("</body></html>")
#
# end of section 3
#
class MainPage(webapp.RequestHandler):
def get(self):

self.response.out.write('<html><body>Welcome to Wattcher!Here are the last 10 datapoints:')

powerusages = db.GqlQuery("SELECT * FROM Powerusage ORDER BY date DESC LIMIT 10")

for powerused in powerusages:
if powerused.sensornum:
self.response.out.write('%s\'s sensor #%d' %
(powerused.author.nickname(), powerused.sensornum))
else:
self.response.out.write('%s' % powerused.author.nickname())

self.response.out.write(' used: %f Watts at %s' % (powerused.watt, powerused.date))
self.response.out.write("</body></html>")
#
# end of section 4
#
application = webapp.WSGIApplication(
[('/', MainPage),
('/report', PowerUpdate),
('/dump', DumpData)],
debug=True)

def main():
run_wsgi_app(application)

if __name__ == "__main__":
main()
#
# end of section 5
#

by **adafruit** » Mon Jun 22, 2009 9:18 pm

you should do all the GAE tutorials from google's site. the GAE tweetawatt code is for advanced users. beginners should use the python scripts

by **rimasg** » Fri Jul 08, 2011 5:03 pm

The GAE seems to be having problems within the DumpData class. If you omit this class from the app, it works. However, this class seems to make it have a server error.

Anyone have any ideas? It must be a syntax error or something...

by **rimasg** » Mon Jul 11, 2011 10:45 am

solution: add a single quote before "" in DumpData class in the write.out for nickname... should get it all to work

Cannot get the GAE scripts posted in the web to work

Cannot get the GAE scripts posted in the web to work

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