google app engine with python 500 error keeps coming - google-app-engine-python

Question

I have created a google app engine application called Ascii Art at this link http://ascii-chan-1018.appspot.com/ but for some reason sometimes when you post something it gives you this error code on the screen
"500 Internal Server Error The server has either erred or is incapable of performing the requested operation." Sometimes it works and sometimes it gives you this error code. I'm not sure if its my source code or if its an error on google's servers.
import os
import re
import sys
import urllib2
import random
import logging
from xml.dom import minidom
from string import letters
import webapp2
import jinja2
from google.appengine.api import memcache
from google.appengine.ext import db
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir), autoescape=True)
art_key = db.Key.from_path('ASCIIChan', 'arts')
def console(s):
sys.stderr.write('%s\n' % s)
IP_URL = "http://api.hostip.info/?ip="
def get_coords(ip):
ip = "17.173.254.223"
url = IP_URL + ip
content = None
try:
content = urllib2.urlopen(url).read()
except URLError:
return
if content:
d = minidom.parseString(content)
coords = d.getElementsByTagName("gml:coordinates")
if coords and coords[0].childNodes[0].nodeValue:
lon, lat = coords[0].childNodes[0].nodeValue.split(',')
return db.GeoPt(lat, lon)
class Handler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
def render_str(self, template, **params):
t = jinja_env.get_template(template)
return t.render(params)
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
GMAPS_URL = "http://maps.googleapis.com/maps/api/staticmap?size=380x263&sensor=false&"
def gmap_img(points):
markers = '&'.join('markers=%s,%s' % (p.lat, p.lon) for p in points)
return GMAPS_URL + markers
class Art(db.Model):
title = db.StringProperty(required = True)
art = db.TextProperty(required = True)
created = db.DateTimeProperty(auto_now_add = True)
coords = db.GeoPtProperty( )
def top_arts(update = False):
key = 'top'
arts = memcache.get(key)
if arts is None or update:
logging.error("DB QUERY")
arts = db.GqlQuery("SELECT * "
"FROM Art "
"WHERE ANCESTOR IS :1 "
"ORDER BY created DESC "
"LIMIT 10",
art_key)
arts = list(arts)
memcache.set(key, arts)
return arts
class MainPage(Handler):
def render_front(self, title="", art="", error=""):
arts = top_arts()
img_url = None
points = filter(None, (a.coords for a in arts))
if points:
img_url = gmap_img(points)
#display the image URL
self.render("Ascii.html", title = title, art = art, error = error, arts = arts, img_url = img_url)
def get(self):
self.render_front()
def post(self):
title = self.request.get("title")
art = self.request.get("art")
if title and art:
p = Art(parent=art_key, title = title, art = art)
#lookup the user's coordinates from their IP
coords = get_coords(self.request.remote_addr)
#if we have coordinates, add them to the art
if coords:
p.coords = coords
p.put()
#rerun the query and update the cache
top_arts(True)
self.redirect("/")
else:
error = "Invalid, are you sure you entered a title and art work?"
self.render_front(error = error, title = title, art =art)
app = webapp2.WSGIApplication([('/', MainPage)])

Answer 1

Well I'm not sure if you can consider it solving the problem but I just removed the google maps code that was left over. It kept complaining about the line except URLError, so after I removed the maps code it worked fine, and my initial plan was to remove it anyways.