Can't Get Working Install on Debian Due to Gevent Incompatibility

[BSigns]

I'm having trouble getting a working install of the Plivo framework due to issues between Plivo and Gevent.

The install itself works, and plivo is up and running. However, if I try to handle an inbound call that touches Plivo in any way, I get this in plivo-outbound.log:

>> 2013-12-09 12:41:48,416 plivo-outbound[7312]: ERROR: (1) AssertionError: Impossible to call blocking function in the event loop callback

This appears to be related to an issue where plivo won't work with recent versions of Gevent.  See this issue: https://github.com/plivo/plivoframework/issues/96

No problem, right?  I just need to install an older version of Gevent?

Well, the problem is that plivo_install.sh script already tries to do that, but it gets thwarted.  These lines:

># force installation of gevent 1.03a

>pip install  --upgrade -f http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz gevent

Don't actually install that older version.  it appears, instead, to install the latest version of gevent.  Here's a cut and paste from what the install script outputs:

>  Downloading/unpacking gevent

>  Downloading gevent-1.0.tar.gz (1.4MB): 1.4MB downloaded

>  Running setup.py egg_info for package gevent

I did try changing that "pip install" line, but it runs into an unrelated issues...installing gevent directly from github requires cython, which then fails for another unrelated reason (cython complains about encoding in some of the base plivo files).

And, to cut to the chase:

Is there some simple modification I can make to the plivo_install.sh script to get it to install the older version of gevent?

Things I've tried:

- Removing --upgrade from the pip install command.  It still installs the newest version of gevent

- Changing the url to an older version of gevent on github. I tried this, but installing from github invokes the cython dependency and subsequent failure. (see https://github.com/surfly/gevent/issues/258)

- I also considered doing it by hand, but Plivo leverages python virtual environments, and there's a fairly complex chain of variables in the script that have to be set correctly for that to work.

Lastly, FWIW, as far as I can tell, this means that nobody can run the simple "Get Started" instructions and get a working install of the Plivo framework.

 

[BSigns]

I finally hit on something that worked.

I replaced this line in plivo_install.sh

>pip install  --upgrade -f http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz gevent

With this:

>pip uninstall gevent

>pip install -Iv http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz

And re-ran the installer.  It does prompt me for confirmation during the install, but everything is working now, no "AssertionError: Impossible to call blocking function in the event loop callback" problems with inbound calls.

[BSigns]

Note that in this:

>pip uninstall gevent

>pip install -Iv http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz

The -Iv switch is "dash capital I  lowercase v".   The I looks like a lowercase L, but it's not.    'I' and 'l', unfortunately, look the same in the groups.google.com default font. Changed it to courier above so it's more clear.

[Mike]

Thanks for sharing the details .

So you are doing in plivo_install.sh :

pip uninstall gevent

pip install -Iv http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz

pip install -e git+${PLIVO_GIT_REPO}@${BRANCH}#egg=plivo

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[BSigns]

Yes, that's correct.  If it were a patch, it would look like:

   

  # force installation of gevent 1.03a

- pip install  --upgrade -f http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz gevent

+ pip uninstall gevent

+ pip install -Iv http://gevent.googlecode.com/files/gevent-1.0a3.tar.gz

  pip install -e git+${PLIVO_GIT_REPO}@${BRANCH}#egg=plivo

[Mike]

added the patch in last commit !

[jyoti....@emreach.com]

I just did a fresh install of plivo on 23/09/2014 and the problem is still there. Should i manually do the changes and install again.

[Sann Min Win]