Eventlet depends on Greenlet which requires compilation

[balloob]

Python dependencies that require compilation are a source of problems for our users. With the recent move to WSGI we have chosen Eventlet as the wsgi server. As coroutine engine, Eventlet depends on greenlet. And greenlet requires compilation.

For Windows greenlet includes the compiled version but for other platforms it does not. This is already causing confusion for people. I've seen comments on reddit and the forum about not having an HTTP server.

For some components it is acceptable that it is a bigger hurdle to install but our HTTP server should not be one of them.

So I think that we should try to explore other options.

One of the options that I found is CherryPiWSGIServer. It is a threaded server and is a general purpose WSGI server, it doesn't require us to use CherryPy.

CC @JshWright

[balloob]

So it looks like going to a threaded server will require some hacks to get websockets working, which is also not preferred.

Greenlet should come with manylinux wheel builds in their next version 0.4.10 but there is not currently a timeline when this is being released: python-greenlet/greenlet#101

Manylinux builds work on pretty much all linux builds and will automatically be installed with pip 8.1+

[patchedsoul]

Im pretty happy with uWSGI. Used it with many different projects successfully.I've not looked into all of the specifics you guys need to address though.

Sent from my iPhone
Please excuse my brevity or any typo's

On Jun 9, 2016, at 1:12 PM, Paulus Schoutsen <notifications@git.luolix.topmailto:notifications@github.com> wrote:

So it looks like going to a threaded server will require some hacks to get websockets working, which is also not preferred.

Greenlet should come with manylinux wheel builds in their next version 0.4.10 but there is not currently a timeline when this is being released: python-greenlet/greenlet#101python-greenlet/greenlet#101

Manylinux builds work on pretty much all linux builds and will automatically be installed with pip 8.1+

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[balloob]

Uwsgi also uses greenlet. It seems greenlet can work fine but the latest
release does not include the correct wheel

On Thu, Jun 9, 2016, 12:38 jbags81 notifications@github.com wrote:

Im pretty happy with uWSGI. Used it with many different projects
successfully.I've not looked into all of the specifics you guys need to
address though.

Sent from my iPhone
Please excuse my brevity or any typo's

On Jun 9, 2016, at 1:12 PM, Paulus Schoutsen <notifications@github.com
mailto:notifications@github.com> wrote:

So it looks like going to a threaded server will require some hacks to get
websockets working, which is also not preferred.

Greenlet should come with manylinux wheel builds in their next version
0.4.10 but there is not currently a timeline when this is being released:
python-greenlet/greenlet#101<
https://github.com/python-greenlet/greenlet/issues/101>

Manylinux builds work on pretty much all linux builds and will
automatically be installed with pip 8.1+

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[kellerza]

On a Centos clean virtualenv, pip install homeassistant hass fails with greenlet error, but it is solved with pip install eventlet (as base requirement) or
REQUIREMENTS = ("eventlet==0.19.0", "static3==0.7.0", "Werkzeug==0.11.5", "greenlet==0.4.9") in http.py which installs in deps

Specifically uninstalled python-devel and gcc for these tests

[kellerza]

For Centos there seems to be platform libraries for greenlet though according to pypa/pip#3694 that fixed installing via --target (used by HA's REQUIREMENTS)

Maybe just add greenlet or eventlet as a base requirement for a release or two? (will solve Centos at least)

[balloob]

Yeah that seems reasonable. I'll put eventlet as a base requirement while waiting till pip releases a new version with the fix included.

Once pip has been updated, I'll make that the minimum requirement for HA and so by the time we install eventlet as a http dependency we will have the new pip installed.

[balloob]

#2264 will fix one issue. The other fix we need is to get a greenlet build with the manylinux wheels included.

[balloob]

Greenlet pushed out 0.4.10 which included manylinux wheels, we should no longer require compilation on Linux.

Eventlet depends on greenlet >.3 so we should be fine now.

[brownad]

This still doesn't work using that version of greenlet on a synology dsm

[hokus15]

I also have the same problem with raspi 3

[balloob]

We need to see if we can provide ARM builds for greenlet

On Thu, Jun 16, 2016, 10:55 Jordi notifications@github.com wrote:

I also have the same problem with raspi 3

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[balloob]

Reopening the issue as we currently do not have a proper solution for ARM builds which includes Raspberry Pi. Manylinux builds only target x86 x64.

[balloob]

We are no longer using eventlet.