The 1.0.12.1 release of the gdata-python-client has a couple of nifty new features which I thought are worth mentioning. First, is a new module which allows the Python library to be used on Google App Engine. Since the App Engine runs a sandboxed Python interpreter, HTTP calls must be made using one of the App Engine's APIs: urlfetch. After some refactoring of the library's code, I was able to write a drop-in replacement for making HTTP requests, so that the gdata.service module can be used on Google App Engine. To use urlfetch instead of the library's default (httplib), you would use the following:
import gdata.serviceThis refactoring has the added benefit of making it easier to swap out the HTTP transport layer from under the gdata.service module. I'm planning to take advantage of this for a new mock_service module to use in unit tests, and the door is open if people want to help with that or other ideas (I've been meaning to support httplib2, and will one of these days).
import gdata.urlfetch
# Use urlfetch instead of httplib
gdata.service.http_request_handler = gdata.urlfetch
Second, I'd like to extend a big thank you to Dag Brattli , who wrote modules for the Google Contacts API. Now you can access and manage your Gmail contacts using the same Python library you've come to know. (and maybe, dare I say, love?) Dag is the latest in a long line of contributors to whom I owe a debt of gratitude. This library wouldn't have support for Contacts and other services and use cases without the hard work of Dag, Takashi, Håvard, Benoit, and others who have submitted patches or reported issues (apologies if I've forgotten anyone).
Updated (April 10th, 2008) to reference release 1.0.12.1 instead of 1.0.12. The new release fixes an issue with importing
ElementTree.
17 comments:
Jeff,
I can't get it to work. Here is my handler.py code. I am unable to import the packages in PROD. Everything works fine in my DEV M/C(XP).
import sys
import cgi
import wsgiref.handlers
import string
from google.appengine.ext import webapp
from google.appengine.api import users
from google.appengine.ext import db
from google.appengine.ext.webapp import template
#As soon as i add these import in PROD it fails with a 500 Error
import gdata.service
import gdata.urlfetch
# Use urlfetch instead of httplib
gdata.service.http_request_handler = gdata.urlfetch
class Blog(webapp.RequestHandler):
def get(self):
try:
self.response.out.write('Hello')
except:
self.response.out.write(sys.exc_info())
class MainPage(webapp.RequestHandler):
def get(self):
self.response.out.write('Hello')
def main():
application = webapp.WSGIApplication(
[('/', MainPage),
('/blog', Blog),
],
debug=True)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == "__main__":
main()
import sys
import cgi
import wsgiref.handlers
import string
from google.appengine.ext import webapp
from google.appengine.api import users
from google.appengine.ext import db
from google.appengine.ext.webapp import template
#As soon as i add these import in PROD it fails with a 500 Error
import gdata.service
import gdata.urlfetch
# Use urlfetch instead of httplib
gdata.service.http_request_handler = gdata.urlfetch
class Blog(webapp.RequestHandler):
def get(self):
try:
self.response.out.write('Hello')
except:
self.response.out.write(sys.exc_info())
class MainPage(webapp.RequestHandler):
def get(self):
self.response.out.write('Hello')
def main():
application = webapp.WSGIApplication(
[('/', MainPage),
('/blog', Blog),
],
debug=True)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == "__main__":
main()
Hi Venkatesh, my first guess would be that the gdata and atom packages might not have been uploaded to your server. It should work if you copy the src/atom and src/gdata directories into your App Engine app's directory. The sample would work on your machine, because it can import from the modules you've installed locally, however, App Engine doesn't have these modules by default. Was that the issue?
Thanks Jeff. IT worked.
The mistake I did was this.
gdata and atom where under root directory and not the project directory.
Once I move those two folders to my current project directory it worked.
Thanks a lot for your quick response.
Ah, yes ..i saw 37 files getting upload (Guess they were Gdata/atom src)
Jeff,
Can't get it to work with AutSub authentication. I get
"(, DownloadError(), )"
Here is my handler code.
def GetAuthSubUrl(req):
next = 'http://' + req.environ['HTTP_HOST'] + '/blog'
scope = 'http://www.blogger.com/feeds'
secure = True
session = True
blogger_service = service.GDataService()
return blogger_service.GenerateAuthSubURL(next, scope, secure, session);
class Document(db.Model):
author = db.UserProperty()
content = db.TextProperty()
date = db.DateTimeProperty(auto_now_add=True)
class Blog(webapp.RequestHandler):
def get(self):
try:
authsub_token = self.request.get('token')
blogger_service = service.GDataService()
blogger_service.auth_token = authsub_token
blogger_service.UpgradeToSessionToken()
blogger_service.http_request_handler = gdata.urlfetch
# Get the blog ID for the first blog.
feed = blogger_service.Get('/feeds/default/blogs')
self.response.out.write(authsub_token)
self_link = feed.entry[0].GetSelfLink()
if self_link:
self.blog_id = self_link.href.split('/')[-1]
for entry in feed.entry:
self.response.out.write("\t" + entry.title.text)
except:
self.response.out.write(sys.exc_info())
class MainPage(webapp.RequestHandler):
def get(self):
authSubUrl = GetAuthSubUrl(self.request);
self.response.out.write(self.request.environ['HTTP_HOST'])
self.response.out.write('Login to your Google account' % authSubUrl)
def main():
application = webapp.WSGIApplication(
[('/', MainPage),
('/blog', Blog),
],
debug=True)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == "__main__":
main()
GData doesn't work on my development server, I need to upload the application to debug it..
I'm using Windows Vista, Python 2.5.2, gdata.py-1.0.12.1.tar
And, GData-py, works fine under Python IDE, the only problem is on the development server...
This is a sample error on localhost:8080
Traceback (most recent call last):
File "C:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 484, in __call__
handler.get(*groups)
File "E:\appeng\picasa-gallery\sample.py", line 26, in get
albums = pws.GetUserFeed().entry
File "E:\appeng\fotogaytan\gdata\photos\service.py", line 239, in GetUserFeed
return self.GetFeed(uri, limit=limit)
File "E:\appeng\fotogaytan\gdata\photos\service.py", line 182, in GetFeed
return self.Get(uri, converter=gdata.photos.AnyFeedFromString)
File "E:\appeng\fotogaytan\gdata\service.py", line 484, in Get
return converter(result_body)
File "E:\appeng\fotogaytan\gdata\photos\__init__.py", line 1072, in AnyFeedFromString
File "C:\Python25\lib\xml\etree\ElementTree.py", line 962, in XML
parser = XMLTreeBuilder()
File "C:\Python25\lib\xml\etree\ElementTree.py", line 1118, in __init__
"No module named expat; use SimpleXMLTreeBuilder instead"
ImportError: No module named expat; use SimpleXMLTreeBuilder instead
I was not able to run a veru simple test to list my documents. I can get it running under command line, but not under the dev server. The expat module is not imported, and it crashes on line "documents_feed = client.GetDocumentListFeed()"
Is there any way to solve this issue?
import wsgiref.handlers
import gdata.docs.service
import gdata.service
import gdata.urlfetch
from google.appengine.ext import webapp
gdata.service.http_request_handler = gdata.urlfetch
class MyHandler(webapp.RequestHandler):
def get(self):
client = gdata.docs.service.DocsService()
client.ClientLogin('mazoqui@gmail.com', '?????????')
documents_feed = client.GetDocumentListFeed()
#for document_entry in documents_feed.entry:
# self.response.out.write(document_entry.title.text)
def main():
app = webapp.WSGIApplication([
(r'.*',MyHandler)], debug=True)
wsgiref.handlers.CGIHandler().run(app)
if __name__ == "__main__":
main()
@ Venkatesh, Sebastian Aviña, and m_Zoqui: Glad to hear this is generating interest! I'm more than happy to help you get started with this new environment, and I think this might be easier handled in a discussion group (the formatting in the comments can make it difficult to see your code). How about we meet in the gdata-python client contributor's group?
Hi Jeff,
thank you for this article. But how do I get GData work with Google App Engine Launcher/local server? I'm on Mac OS. It fails when I run my service via dev_appserver.py or GoogleAppEngineLauncher (version 1.0.2 from 15 May):
import gdata.service
ImportError: No module named gdata.service
If I have to add GData python library, then where should I put it? Thank you.
I see from up comments above and from G. App engine group: I had to copy folders gdata and atom from GData python src in the top level of my project (same level as app.yml).
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