[R] [R-pkgs] [ANNOUNCE] mod_R: The R/Apache Integration Project

From: Jeffrey Horner <jeff.horner_at_vanderbilt.edu>
Date: Tue 02 Aug 2005 - 17:54:21 EST

   What is it?



   mod_R is a project dedicated to embedding the R interpreter inside    the Apache 2.0 (and beyond) web server for the purpose of writing web    applications in R. It's composed of three parts:

   mod_R: the Apache 2.0 module that implements the glue to load the    R interpreter.

   RApache: the R package that provides the API for programming web    applications in R.

   libapreq 2.0.4: an Apache sponsored project for parsing request input.    If you don't want to compile and install this version, then you can    specify which libapreq2 library to use during configuration.

   The Latest Version


   Details of the latest version can be found at the mod_R    project page:

http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/ApacheRproject

   (mind the wrap)

   Prerequisites



   This release has been tested under Debian Linux with Apache 2.0.54,    R 2.1.1, and libapreq 2.0.4. Apache2 _MUST_ be compiled with the    prefork MPM to compile mod_R. Also, R must have been compiled with    the --enable-R-shlib configure flag.

   Installation



   The following is the preferred way to compile and install mod_R:
     $ ./configure --with-apache2-apxs=/path/to/apxs --with-R=/path/to/R
     $ make
     $ make install

   Both --with-apache2-apxs and --with-R _MUST_ be specified. Otherwise,    trying to figure out the dependencies between the sources and headers    and library paths becomes quite complex.

   If you don't want to compile and install the bundled libapreq2 version,    then add --with-apreq2-config=/path/to/apreq2-config. The version _MUST_    be equal to or greater than 2.0.4.

   Configuration



   In order to use mod_R and RApache, you must configure apache to find    it. Type help("directives",package="RApache") once mod_R is installed    for a little more detail. Add something similar to this to the apache    config file:

     LoadModule R_Module /path/to/mod_R.so

     <Location /URL>
        SetHandler r-handler
        Rsource /path/to/R/code.R
        RreqHandler function-name
        Rlibrary library-name
     </Location>

   Also, libR.so _MUST_ be found in the shared library path as it is    linked to by mod_R, RApache and the rest of the packages containing    shared libraries. You can either set LD_LIBRARY_PATH like this:

      $ export LD_LIBRARY_PATH=`/path/to/R RHOME`/lib

   or add that path to /etc/ld.so.conf and then run ldconfig.

   NOTE: the latest apache2 debian packages cause the web server to run    in a very reduced environment, thus one is unable to set LD_LIBRARY_PATH    before calling /etc/init.d/apache2. One option is to actually edit that    file and add the LD_LIBRARY_PATH explicitly. Another is to use the apache2ctl

   scripts which are also bundled with the debian packages. Or you can add it

   to /etc/ld.so.conf.

   Documentation



   All of the documentation is currently in the RApache package. Once    you install mod_R, start R and load the RApache package. You'll get    a warning that you're currently not running the R interpreter within    Apache; just don't try to run any of the code. Sample session:     > library(RApache)
    Warning message:

    RApache is only useful within the Apache web server.     It is loaded now for informational purposes only

     in: firstlib(which.lib.loc, package)     > help(package="RApache")

                    Information on package 'RApache'

    Description:

    Package:       RApache
    Version:       0.1-0
    Date:          2005-08-02
    Title:         An R interface to the Apache 2.0 web server
    Author:        Jeffrey Horner
    Maintainer:    Jeffrey Horner <jeff.horner@vanderbilt.edu>
    License:       Apache License, Version 2.0
    Description: RApache allows web applications to be written in R and     executed within the Apache 2.0 web server.     Built: R 2.1.0; i386-pc-linux-gnu; 2005-08-02 01:06:26; unix

    Index:

    IO                      IO in RApache
    apache.add_cookie       Adding Cookies to Outgoing Headers
    apache.add_header       Adding HTTP headers
    apache.allow_methods    RApache Methods
    apache.log_error        Logging Errors to the Apache error log
    apache.set_content_type
    Setting the Content Type header
    apr_table               Structure of the apr_table type in RApache
    as.html                 Converting RApache objects to HTML
    directives              RApache directives used in Apace config file
    intro                   Introduction to RApache
    request_rec             Structure of the RApache request record
    return_codes            RApache handler return codes


   Licensing


   Please see the file called LICENSE.

-- 
Jeffrey Horner       Computer Systems Analyst         School of Medicine
615-322-8606         Department of Biostatistics   Vanderbilt University

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Received on Wed Aug 03 00:23:14 2005

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