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POuWSGI, cherrypy and threading
 

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    <p>preface: I would like to separate these problems into smaller questions, but apparently, I am missing some pieces of the puzzle and it seems impossible to me. </p> <p>I developed my cherrypy application using cherrypy's built in WSGI server. I naively assumed that when the time comes, I will be able to use created WSGI Application class and deploy it using any WSGI compliant server.</p> <p>I used <a href="http://www.defuze.org/archives/222-integrating-sqlalchemy-into-a-cherrypy-application.html" rel="nofollow">this blog post</a> to create my own (but very similar) cherrypy Plugin and Tool to connect to database using SQLAlchemy during http requests.</p> <p>I expected that any server will somehow work like cherrypy's built in server:</p> <ol> <li>main process will spawn X threads to satisfy X concurrent requests</li> <li>my engine Plugin will create SQLalchemy engine with connection pool = X (so any request will have its connection)</li> <li>on request arrival, my Tool will supply sql alchemy connection from pool</li> </ol> <p>This flow does not match with uWSGI (as long as I understand it). </p> <p>I assign my <code>application.py</code> in uWSGI configuration. This file looks something like this:</p> <pre><code>cherrypy.tools.db = DbConnectorTool() cherrypy.engine.dbengine = DbEnginePlugin(cherrypy.engine, settings.database) cherrypy.config.update({ 'engine.dbengine.on': True }) from myapp.application import Application root = Application(settings) application = cherrypy.Application(root, script_name='', config=settings) </code></pre> <p>I was using this <code>application.py</code> to mount my application into cherrypy's built in server when I was developing and testing it.</p> <p>The problems are that uWSGI does not create any threads itself and my SQLAlchemy plugin is not working with it, because no <code>cherrypy.engine</code> is created.</p> <p>Does uWSGI support threading in the meaning of using threads to serve multiple concurrent requests? Can I start these threads in my <code>application.py</code>? Will uWSGI understand it and use these threads for concurrent requests? And how can this be done? I think cherrypy can be used somehow, or not? And what about my SQLAlchemy Plugin, how can I start <code>cherrypy.engine</code> when using only WSGI <code>cherrypy.Application</code>?</p> <p>Any help or information that could help me will be appreciated.</p> <p><strong>Edit:</strong></p> <p>My uWSGI configuration:</p> <pre><code>&lt;uwsgi&gt; &lt;socket&gt;127.0.0.1:9001&lt;/socket&gt; &lt;master/&gt; &lt;daemonize&gt;/var/log/uwsgi/app.log&lt;/daemonize&gt; &lt;logdate/&gt; &lt;threads/&gt; &lt;pidfile&gt;/home/web/uwsgi.pid&lt;/pidfile&gt; &lt;uid&gt;uwsgi&lt;/uid&gt; &lt;gid&gt;uwsgi&lt;/gid&gt; &lt;workers&gt;2&lt;/workers&gt; &lt;harakiri&gt;90&lt;/harakiri&gt; &lt;harakiri-verbose/&gt; &lt;home&gt;/home/web/&lt;/home&gt; &lt;pythonpath&gt;/home/web/instance&lt;/pythonpath&gt; &lt;module&gt;core.application&lt;/module&gt; &lt;no-orphans/&gt; &lt;touch-reload&gt;/home/web/uwsgi-reload-web&lt;/touch-reload&gt; &lt;/uwsgi&gt; </code></pre>
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