.\" Man page generated from reStructuredText. . .TH "CHAUSSETTE" "1" "Feb 03, 2021" "1.3.0" "Chaussette" .SH NAME chaussette \- Chaussette Documentation . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. [image] .sp \fBChaussette\fP is a WSGI server you can use to run your Python WSGI applications. .sp The particularity of \fBChaussette\fP is that it can either bind a socket on a port like any other server does \fBor\fP run against \fBalready opened sockets\fP\&. .sp That makes \fBChaussette\fP the best companion to run a WSGI or Django stack under a process and socket manager, such as \fI\%Circus\fP or \fI\%Supervisor\fP\&. \fI\%Build Status\fP\fI\%Coverage Status on master\fP\fI\%\fP\fI\%\fP\fI\%\fP .sp You can run a plain WSGI application, a Django application, or a Paste application. To get all options, just run \fIchaussette \-\-help\fP\&. .SH RUNNING A PLAIN WSGI APPLICATION .sp \fBChaussette\fP provides a console script you can launch against a WSGI application, like any WSGI server out there: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C $ chaussette mypackage.myapp Application is Serving on localhost:8080 Using as a backend .ft P .fi .UNINDENT .UNINDENT .SH RUNNING A DJANGO APPLICATION .sp \fBChaussette\fP allows you to run a Django project. You just need to provide the Python import path of the WSGI application, commonly located in the Django project\(aqs \fBwsgi.py\fP file. For further information about how the \fBwsgi.py\fP file should look like see the \fI\%Django documentation\fP\&. .sp Here\(aqs an example: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C $ chaussette \-\-backend gevent mysite.wsgi.application Application is Serving on localhost:8080 Using as a backend .ft P .fi .UNINDENT .UNINDENT .SH RUNNING A PYTHON PASTE APPLICATION .sp \fBChaussette\fP will let you run a project based on a \fI\%Python Paste\fP configuration file. .sp You just need to use to provide the path to the configuration file in the \fBapplication\fP, prefixed with \fBpaste:\fP .sp Here\(aqs an example: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C $ chaussette paste:path/to/configuration.ini $ Application is $ Serving on localhost:8080 $ Using as a backend .ft P .fi .UNINDENT .UNINDENT .sp The typical use case is to run Chaussette processes under a process and socket manager. Chaussette was developed to run under \fI\%Circus\fP, which takes care of binding the socket and spawning Chaussette processes. .sp To run your WSGI application using Circus, define a \fIsocket\fP section in your configuration file, then add a Chaussette watcher. .sp Minimal example: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C [circus] endpoint = tcp://127.0.0.1:5555 pubsub_endpoint = tcp://127.0.0.1:5556 stats_endpoint = tcp://127.0.0.1:5557 [watcher:web] cmd = chaussette \-\-fd $(circus.sockets.web) \-\-backend meinheld server.app use_sockets = True numprocesses = 5 [socket:web] host = 0.0.0.0 port = 8000 .ft P .fi .UNINDENT .UNINDENT .sp When Circus runs, it binds a socket on the \fI8000\fP port and passes the file descriptor value to the Chaussette process, by replacing \fI${socket:web}\fP by the file number value. .sp \fI\%Supervisor\fP includes a socket manager since version 3.0a7, released in 2009. It was originally developed to support FastCGI processes and thus the configuration section is called \fIfcgi\-program\fP\&. Despite the name, it is not tied to the FastCGI protocol. Supervisor can bind the socket and then spawn Chaussette processes. .sp To run your WSGI application using Supervisor, define an \fIfcgi\-program\fP section in your configuration file. .sp Minimal example: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C [supervisord] logfile = /tmp/supervisord.log [inet_http_server] port = 127.0.0.1:9001 [supervisorctl] serverurl = http://127.0.0.1:9001 [rpcinterface:supervisor] supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface [fcgi\-program:web] command = chaussette \-\-fd 0 \-\-backend meinheld server.app process_name = %(program_name)s_%(process_num)s numprocs = 5 socket = tcp://0.0.0.0:8000 .ft P .fi .UNINDENT .UNINDENT .sp Notice the \fB\-\-fd 0\fP argument to \fBchaussette\fP\&. Each \fIfcgi\-program\fP section defines its own socket and the file descriptor is always \fB0\fP\&. See the \fI\%Supervisor manual\fP for detailed information. .sp Supervisor will create the socket before spawning the first Chaussette child process. When the last child exits, Supervisor will close the socket. .sp Chaussette is just a bit of glue code on the top of existing WSGI servers, and is organized around \fBback ends\fP\&. .sp By default Chaussette uses a pure Python implementation based on \fBwsgiref\fP, but it also provides more efficient back ends. Most of them are for Python 2 only, but Chaussette can be used under Python 3 with a few of them \- marked in the list below: .INDENT 0.0 .IP \(bu 2 \fBgevent\fP \-\- based on Gevent\(aqs \fIpywsgi\fP server .IP \(bu 2 \fBfastgevent\fP \-\- based on Gevent\(aqs \fIwsgi\fP server \-\- faster but does not support streaming. .IP \(bu 2 \fBmeinheld\fP \-\- based on Meinheld\(aqs fast C server .IP \(bu 2 \fBwaitress\fP \-\- based on Pyramid\(aqs waitress pure Python web server (py3) .IP \(bu 2 \fBeventlet\fP \-\- based on Eventlet\(aqs wsgi server .IP \(bu 2 \fBgeventwebsocket\fP \-\- Gevent\(aqs \fBpywsgi\fP server coupled with \fBgeventwebsocket\fP handler. .IP \(bu 2 \fBgeventws4py\fP \-\- Gevent\(aqs \fBpywsgi\fP server coupled with \fBws4py\fP handler. .IP \(bu 2 \fBsocketio\fP \-\- based on gevent\-socketio, which is a custom Gevent server & handler that manages the socketio protocol. .IP \(bu 2 \fBbjoern\fP \-\- based on Bjoern. .IP \(bu 2 \fBtornado\fP \-\- based on Tornado\(aqs wsgi server. .UNINDENT .sp You can select your backend by using the \fB\-\-backend\fP option and providing its name. .sp For some backends, you need to make sure the corresponding libraries are installed: .INDENT 0.0 .IP \(bu 2 \fBgevent\fP and \fBfastgevent\fP: \fIpip install gevent\fP .IP \(bu 2 \fBmeinheld\fP : \fIpip install meinheld\fP .IP \(bu 2 \fBwaitress\fP : \fIpip install waitress\fP .IP \(bu 2 \fBeventlet\fP : \fIpip install eventlet\fP .IP \(bu 2 \fBgeventwebsocket\fP: \fIpip install gevent\-websocket\fP .IP \(bu 2 \fBgeventws4py\fP: \fIpip install ws4py\fP .IP \(bu 2 \fBsocketio\fP: \fIpip install gevent\-socketio\fP .IP \(bu 2 \fBbjoern\fP: \fIpip install bjoern\fP .IP \(bu 2 \fBtornado\fP: \fIpip install tornado\fP .UNINDENT .sp If you want to add your favorite WSGI Server as a backend to Chaussette, or if you think you can make one of the backend Python 3 compatible, send me an e\-mail ! .sp If you curious about how each on of those backends performs, you can read: .INDENT 0.0 .IP \(bu 2 \fI\%http://blog.ziade.org/2012/06/28/wgsi\-web\-servers\-bench/\fP .IP \(bu 2 \fI\%http://blog.ziade.org/2012/07/03/wsgi\-web\-servers\-bench\-part\-2/\fP .UNINDENT .sp Most WGSI servers out there provide advanced features to scale your web applications, like multi\-threading or multi\-processing. Depending on the project, the \fIprocess management\fP features, like respawning processes that die, or adding new ones on the fly, are not always very advanced. .sp On the other hand, tools like Circus and Supervisor have more advanced features to manage your processes, and are able to manage sockets as well. .sp The goal of \fIChaussette\fP is to delegate process and socket management to its parent process and just focus on serving requests. .sp Using a pre\-fork model, the process manager binds a socket. It then forks Chaussette child processes that accept connections on that socket. .sp For more information about this design, read : .INDENT 0.0 .IP \(bu 2 \fI\%http://blog.ziade.org/2012/06/12/shared\-sockets\-in\-circus\fP\&. .IP \(bu 2 \fI\%https://circus.readthedocs.io/en/latest/for\-ops/sockets/\fP .UNINDENT .INDENT 0.0 .IP \(bu 2 Repository : \fI\%https://github.com/circus\-tent/chaussette\fP .IP \(bu 2 Documentation : \fI\%https://chaussette.readthedocs.io\fP .IP \(bu 2 Continuous Integration: \fI\%https://travis\-ci.org/circus\-tent/chaussette\fP .UNINDENT .SH AUTHOR Tarek Ziade .SH COPYRIGHT 2021, Tarek Ziade .\" Generated by docutils manpage writer. .