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List:       uwsgi
Subject:    [uWSGI] STDIN never closed with CGI and POST
From:       Konstantin Ryabitsev <konstantin () linuxfoundation ! org>
Date:       2016-04-22 18:59:42
Message-ID: 20160422185942.GA31201 () gmail ! com
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Hi, all:

I'm trying to set up uwsgi with cgi plugin and git-http-backend, to
see if we get better performance with uwsgi over fastcgi (http-git
performance is fairly important to us for git.kernel.org).

However, all my attempts have been in vain thus far, because attempting
to clone always hangs -- GETs work just fine, but when we try to do a
POST, git-http-backend enters endless read() and then things time out.
Apparently, this is because STDIN with POST data is never closed.

Here's my configuration:

nginx (version 1.8.1):

-------
server {
    root /var/www/html;
    server_name git.example.com;

    location / {
        include uwsgi_params;

        uwsgi_modifier1 9;
        uwsgi_buffering off;
        uwsgi_param GIT_HTTP_EXPORT_ALL "1";
        uwsgi_param GIT_PROJECT_ROOT    /var/lib/git/repos;
        uwsgi_param PATH_INFO           $1;
        uwsgi_pass 127.0.0.1:10002;
    }
}
-------

uwsgi (version 2.0.12):

-------
[uwsgi]
plugins = cgi
uid = apache
gid = apache
post-buffering = 8192
processes = 1
threads = 50
socket = :10002
#cgi = /var/www/cgi-bin/foo
cgi = /usr/libexec/git-core/git-http-backend
logto = /var/log/uwsgi/git-http-backend/uwsgi.log
-------

The "foo" script I've used to narrow things down is as follows:

-------
#!/bin/bash
cat "${1:-/dev/stdin}" > /var/tmp/foo-stdin

# We never get here, it hangs above
echo ";Finished stdin" >> /var/tmp/foo-stdin

# This is here for testing via regular cgi interface with apache
echo "Status: 200 OK"
echo
echo "OK"
-------

Anything I'm doing obviously wrong that STDIN is never closed? Is nginx the
culprit here?

I'm a bit stumped, so any help will be greatly appreciated.

Regards
-- 
Konstantin Ryabitsev
Linux Foundation Collab Projects
Montréal, Québec

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