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RubyForge (http://rubyforge.org/) is the largest community repository for Ruby projects and libraries, and is maintained by Richard Kilmer and Tom Copeland. It contains thousands of projects and acts as a centralized location for the hosting of Ruby projects. Nearly all the major Ruby libraries are available from or hosted there, including Ruby on Rails. As well as basic hosting, RubyForge lets project maintainers create simple Web sites hosted under subdomains of RubyForge (as with http://mongrel.rubyforge.org/), and it provides source management servers (CVS and SVN) for those who require them. Importantly, however, RubyForge acts as the default source for gems. When a user runs gem install rails or gem install mongrel, gem looks for the gem files at RubyForge. Therefore, if you want your gem to be installed easily by users, hosting it at RubyForge is key. Hosting with RubyForge is also free, and with RubyForge s status in the community, hosting your project at RubyForge makes it look more legitimate.
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CHAPTER 10 DEPLOYING RUBY APPLICATIONS AND LIBRARIES
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To host a project with RubyForge, create a new account using the link from the front page at http://rubyforge.org/, and once you re set up, you can apply to create a new project. You have to enter several pieces of information about your project, but within a couple of days you should be approved and will be able to upload files. Gems associated with any project hosted in RubyForge become available to install with RubyGems within a few hours.
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Deploying Ruby Applications As Remote Services
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An alternative to giving people your source or packaging it up to be run locally on a user s machine is making a program s functionality available as a remote service over a network. This only works for a small subset of functionality, but providing functionality remotely gives you more control over your code and how it is used. Ruby s networking and Web features will be covered in more depth in s 14 and 15, but in this section we ll look at how to put together basic services with Ruby that allow users to access a program s functionality over a network.
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A common way to make scripts available online is to upload them to Web hosting providers as CGI scripts. Common Gateway Interface (CGI) is a standard that allows Web server software (such as Apache or Microsoft IIS) to launch programs and send data back and forth between them and the Web client. Many people associate the term CGI with the Perl language, as Perl has been the most common language with which to write CGI scripts. However, CGI is language agnostic, and you can just as easily write CGI scripts with Ruby (more easily, in fact!).
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A Basic CGI Script
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The most basic Ruby CGI script looks like this:
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#!/usr/bin/ruby puts "Content-type: text/html\n\n" puts "<html><body>This is a test</body></html>"
If you called this script test.cgi and uploaded it to a Unix-based Web hosting provider (the most common type) with the right permissions, you could use it as a CGI script. For example, if you have the Web site http://www.example.com/ hosted with a Linux Web hosting provider and you upload test.cgi to the main directory and give it execute
CHAPTER 10 DEPLOYING RUBY APPLICATIONS AND LIBRARIES
permissions, then visiting http://www.example.com/test.cgi should return an HTML page saying This is a test.
Note Although /usr/bin/ruby is referenced in the previous example, for many users or Web hosting providers Ruby might be located at /usr/local/bin/ruby. Make sure to check, or try using usr/bin/env ruby.
When test.cgi is requested from a Web browser, the Web server looks for test.cgi on the Web site, and then executes it using the Ruby interpreter (due to the shebang line as covered earlier in this chapter). The Ruby script returns a basic HTTP header (specifying the content type as HTML) and then returns a basic HTML document.
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