Ruby as a scripting language for web server - ruby

Is it possible to use Ruby as a scripting language with a HTTP server ? I'd like to be able to simply put some Ruby files in a web directory and be able to execute them from my browser - just like I did with PHP.
I have absolutely nothing against frameworks such as RoR, but I was told that I should first learn Ruby and only then move on with higher level frameworks. Of course, I could write some Ruby scripts and run them in the console, but I would prefer getting the input/output from my browser :)
Is that possible at all ? Otherwise, how hard would it be for me to build a quick and simple web framework ?


Take a look at Sinatra - not your plain ol' CGI/PHP style, but really really simple web framework to get started with, elegant so it won't get in your way while learning Ruby, and powerful enough to make quite useful web apps.


ERB is similar in spirit to PHP (in the sense you need).
You need to setup apache to parse rhtml files with erb, here is a guide for OSX.


Depends on your server, but any language can be used with CGI Programming, including Ruby.
Generally speaking - to find out - put a basic "Hello World" .rb or .cgi file on your web server and chmod it's permissions so it is executable to "others":
chmod 755 YourScript.rb
When writing CGI scripts, you have to ensure that you have the appropriate shebang at the top of your file. For Ruby you'd probably use something like...
#!/usre/bin/ruby
(no promises this is the one)
Then write yourself a little hello world CGI script. The output of a CGI script is kind of a partial HTTP Response: (I'm not really a Ruby coder so this might be completely arse-backwards)
puts "Content-Type:text/plain\n"
puts "Content-Length:12\n"
puts "\n"
puts "Hello World!"
Visit the file the same way you would a PHP or Perl script and you'll see if it works. Again; it depends on your server.


You can do that configuring your server for CGI.
You can even write web applications with assembler if you want to, using CGI.
(In the dawn of time, they used C/C++ to write web applications, go figure).

Related

Ruby (not Rails) on IIS 7 via FastCGI

Hopefully this is a simple one. I want to run Ruby on IIS 7+ as I would PHP, Perl, Python, etc. (that is to set a handler mapping to .rb files).
Every time I Google for it I get Rails. But I don't want to run Rails, I would just like to run straight Ruby.
I know I'll to set up my headers and all sorts of other stuff, since, unlike PHP, Ruby isn't technically native to the web.
I'm looking for a manual installation for this, not something automated with an executable.
My reason for needing this is simply for learning.
Any answers would be very helpful! Thanks!

Make Ruby interact with Node.js

I'm using Ruby EventMachine to build a realtime web application, so far everything works well, but I would like to add a feature which Node.js has a package for and Ruby does not (node-canvas).
I thought of replacing the entire app with Node.js, but I do prefer writing Ruby code over JavaScript. Furthermore, I'm totally new to Node.js, and although the web app code is not extremely complex, it will require time to rewrite it entirely from scratch with Node.
Is there an easy way that my Ruby code can interact with the Node.js module that I'll build specifically for this feature, maybe through piping or whatnot?

Ended up answering my own question, going to do it using Redis pub-sub capabilities.
Thanks!

How to invoke watir scripts from a web application?

I have a watir script ,that i have to run from a web interface, on the same browser invoking the scripts. Is it possible?

This isn't possible to do, as a browser doesn't understand what ruby is.

I believe that it is possible. I've been intending to begin a similar project to what adithi wanted to do at some point, using PHP. From PHP, you can use the shell_exec command or backtick operator to execute commands in the shell. The ruby returns output using puts, which can be read by the PHP.
http://chipmunkninja.com/Program-Execution-in-PHP%3A-exec-m# seems to be a good page detailing this technique.

Ruby server-side back end scripting tools/resources

I am trying to learn how ruby is used in a server based back end environment. For example I want to be running a ruby script 24/7 on a server. What are the best practices for this and how does one go about doing this?
Can anyone provide some resources on how to do this or if you could label what I am trying to do? I am unsure of the terms that I am supposed to be googling.

Use cron. From OS point of view Ruby app is just a script like bash.
Also all Unix OSes have some kind of daemon script (like see examples in /etc/init.d)

Try BackgroundRb - this is a special Rails plugin that works like a Linux daemon. You could use any classes/models defined in your Rails application within the background code. You could also pass data to/from background process.

Ruby off the rails

Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions.
Sometimes it feels that my company is the only company in the world using Ruby but not Ruby on Rails, to the point that Rails has almost become synonymous with Ruby.
I'm sure this isn't really true, but it'd be fun to hear some stories about non-Rails Ruby usage out there.

One of the huge benefits of Ruby is the ability to create DSLs very easily. Ruby allows you to create "business rules" in a natural language way that is usually easy enough for a business analyst to use. Many Ruby apps outside of web development exist for this purpose.
I highly recommend Googling "ruby dsl" for some excellent reading, but I would like to leave you with one post in particular. Russ Olsen wrote a two part blog post on DSLs. I saw him give a presentation on DSLs and it was very good. I highly recommend reading these posts.
I also found this excellent presentation on Ruby DSLs by Obie Fernandez. Highly recommended reading!

I use Ruby extensively in my work, and none of it is Rails (or even web) based.
My domain is usually client-side Windows applications (wxRuby GUI) and scripts, automating Excel, Internet Explorer, SQL Server queries and report generation (win32ole COM automation). I also use the sqlite, pdf-writer, and gruff libraries for various data munging and graph generation tasks.
Rails' success has been great for Ruby, but I agree that Rails has received so much attention that Ruby's value beyond the web is often overlooked.

We are mainly a C++ shop, but we've found several areas where Ruby has proven quite useful. Here are a few:
Code Generation - Built several DSLs to generate C++/Java/C# code from single input files
Build Support
scripts to generate Makefiles for unix from Visual Studio Project Files
scripts for building projects and formatting the output for Cruise Control
scripts for running our unit tests and formatting the output for Cruise Control
scripts for manipulating Visual Studio projects and solutions from the command line
Integration Tests - We can crank out tests much quicker and cleaner using Ruby than C++
QA's entire testing suite is written in Ruby
Ruby is basically my go to tool for where it makes sense. And it makes sense in a lot of places.

Google Sketchup uses Ruby as an embedded scripting language. You can use it to perform all sorts of 3d modeling and import/export tasks. The scripting works with the free version and there's even decent documentation.

Ruby with a homebrew extension written in C++ does all the heavy pixel pushing for my photography processing. I was using Python+numpy but when doing artsy stuff, Ruby is just more fun. Also the relative lack of, or lesser maturity of, good image processing libraries makes me feel less like i'm reinventing wheels. I am clueless about Rails, other than i've heard of it, have a fuzzy idea what it is, and actually have a book on it (unopened)

We use Watir (Ruby library) to test our .net web application.

Check out Shoes, a simple API for building GUIs in Ruby aimed at novice programmers.

Or you could use Ruby to make music ala Giles Bowkett's Archaeopteryx. This presentation by Giles about Archaeopteryx is one of the best presentations ever. I highly recommend it.

RubyCocoa and MacRuby. Possible to make full Cocoa-based GUI apps without Rails. And then you get to use Interface Builder, too.

I worked on a museum project last year that used a lot of Ruby. (http://http://ourspace.tepapa.com/home)
The part that I spent most of my time on was an interactive floor map. The Map on the floor has sensors so when people walk on it lights are triggered and displays in the wall show images or videos and audio tracks are played.
All the control code for this part of the exhibit is ruby. I wrote C interfaces with ruby wrappers to communicate with the floor sensors and the lighting controllers. The system queries a MYSQL database for the media files to be displayed and then tells computers in the walls to play the media via UDP.
It's the most reliable part of the entire exhibit.
Ruby was used for the other major part of the exhibit, the Wall though I didn't have much to do with that. Most of the graphics were prototyped in ruby using interfaces to OpenGL, a bit of Cocoa and a physics library before being ported to pure Obj-C.

Puppet and Chef: DevOps
I didn't see a mention of Puppet or Chef in the 30 answers that preceded my arrival. Ruby appears to dominate current work in cloud automation and is the base, extension, and templating language of these two big players. They are used primarily to distribute system and application configuration information for server arrays and for general IT workstation management.
The DevOps field is quite Ruby-aware. Today, Perl has a competitor. While a really simple script may often still be written directly for sh(1), a complex task now might be done in Ruby rather than Perl.

The only site I've done with Ruby at work is using Rails, but I'd like to try Merb.
Other than that I do a lot of little utility programs in Ruby - for instance an app that reads RSS feeds and imports new posts into a dabase.
It's fun, so I also write some dumb stuff just because it's so quick. Yesterday I wrote an app to play the Monty Hall problem 100,000 times to help a friend convince her professor that switching is the correct strategy.

I almost take insult that ruby is a rails thing. It is like back when CGI was the latest trend and everyone figured that if you knew perl you must be doing it only because you programmed CGI apps. Ruby is just a scripting language for me, although not as mature as python so I somewhat regret having to jump through some of its hoops and recent changes, I still like it and use it. Although I work in a java shop and therefore groovy is the ideal choice for a scripting language, I still use ruby at home and for throw away scripts that aren't needed to be shared at work.
I was considering getting into RoR from all the buzz and how quick/simple it is, but after looking over rails I didn't see anything at all that was amazing or even the least bit innovative or rapidly fast about its development compared to any other framework. The only benefit I saw was that I could code in ruby, which would be nice, but initial setup, server maintenance and scaling is more difficult, thus re-offsetting the pleasure of coding in ruby.

I created a presentation -- coincidentally named Off The Rails -- to discuss Rack-based web applications:
https://github.com/alexch/Off-The-Rails
The git repo includes slides in Markdown format and sample code (in the form of running applications and middleware). Here's the abstract:
Ruby on Rails is the most popular web application framework for Ruby. But it's not the only one! If you think Rails is too big, or too opinionated, or too anything, you might be happy to learn about the new generation of so-called microframeworks built on Rack. And since Rails 3 is itself a Rack app, you don't have to give up Rails to get the benefit of Sinatra routes or Grape APIs.
And here are some references:
This talk lives at https://github.com/alexch/off-the-rails
Yehuda's #10 Favorite Thing About Ruby
Rack
rack-test
rack-client
Sinatra
Grape
Vegas
Siesta
Rerun
Hope you find it useful!

I'm mostly a Web developer, and I learned Ruby to use Rails, but I like the language so much that I started developing a desktop Swing application in Ruby, using JRuby and Monkeybars. I'm competent in Java, but don't much like using it, and the Swing API is horrible, so putting Ruby on top has been a big win.

We mainly use rails, but we have plenty of other non-rails ruby things - for example a standalone authentication daemon thing for centralized authentication of users, and an 'image processing server' which runs arbitrary numbers of ruby processes to process images in parallel.
Oh, and don't forget good old Rake :-)

Ruby is also used for Desktop application. Especially the use of JRuby to develop Swing desktop application.

I've used Ruby at work for
A data extractor, generating csv files from binary output.
A .ini file generator, turning a simple syntax into a repetitive .ini format.
A simple TCP/IP server, acting as stand-in for the customer's system during testing.

We use Ruby to implement our test automation software. This includes test framework and driver code for Selenium RC, WATIR and AutoIT.
Ruby is powerful enough to create comprehensive applications that can interface with Test tools like Selenium or WATIR, while at the same time reading from data files, interacting with a remote Windows UI and performing near transparent network communication. All while running on Windows or Linux.
The uncluttered syntax makes it ideal for new and inexperienced programmers to read. While its totally OO nature makes it easy for these same programmers to apply good (recently learned) OO techniques, from the start.
The flexible nature of Ruby's syntax also makes the use and creation of DSLs much easier. This allows less-technical people to get invovled, read and possibly create there own tests.

I have used Ruby for code generation of C# and T-SQL stored procedures in a project with unstable requirements. The data model was encoded in a YAML file and .erb templates were used for the classes and stored procedures. It also allowed for a much more DRY solution than would have been possible with straight C# as repetitve code could be factored out into a single method in the code generator.

Where I work, we use Ruby to do a number of different one-off type batch jobs. One example of that is a job that interacts with Amazon's S3 service. At the time, the Ruby S3 library was probably the easiest one out there for us to get up and running in a short amount of time.

I wrote an order processing expert system (see DSL answer as well), converted 100k lines of customer specific perl into about 10k lines of ruby handling dozens of customers. No web components at all, no Rails.

I am a webdriver user. ruby is used by webdriver for automating the build process thanks to rake. see http://code.google.com/p/webdriver/ for details

Heh, great question.
I used Ruby to convert Excel spreadsheet airport facility data to sqlite3 for the android phone platform while making an app for pilots.

I use Ruby with Sinatra which is much simpler than Rails. I did use Rails but just found that it has turned into a bit of a monster, although Rails is still amazing compared to web frameworks available for Java.
The main feature of Ruby that I love however is "eval" and "method_missing", which Rails actually uses for example in ActiveRecord so that you can use the amazing "find_by-field-name-" queries.

I used Ruby for a lot of back-end code simply because I was the only person who was tasked to do it and needed a nice clean language that allowed me to be very productive and write easy to maintain code. I find Ruby allows me to do that easier than Perl and Python. Other people's mileage might vary on that but it works well for me.
Besides that, I like how Sequel and Nokogiri work. I also used ActiveRecord for a while separately from Rails.

We use some Ruby for file manipulation but have not been able to incorporate rails yet.

I've used Ruby a lot professionally for quick scripts for things like shuffling files around. I'm the same way in that I was using Ruby first before touching Rails at all.

In Boulder there was an excellent group of Ruby users who met monthly. This point was made - that Ruby does have an existence beside its use in Rails. Plain Ruby users do exist, are begging for attention, have neat things to show, and can find each other at user group meetings.
They also had better pizza than the Python group, who met also the same day of the month. Can only pick one...

While we do have several Rails apps at work, we also use Ruby for some fairly intensive non-web stuff.
We've got an SMS delivery daemon, which pulls messages from a queue and then delivers them, and credit card processing daemon which other apps can call out to, which makes sure there's a central audit trail.

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