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Ruby script / CGI - demo reporting current log file
Ruby on the Web example from a Well House Consultants training course
More on Ruby on the Web [link]

This example is described in the following article(s):
   • Web and console - same principle, same code - Ruby example - [link]

This example references the following resources:

Source code: brightred Module: R114
#!/usr/bin/env ruby

# Ruby script / CGI - demo reporting current log file
# Graham Ellis / Version 1.0 / See http://www.wellho.net/course/ruby.html

# This example was written very early in a course - before we had looked
# at many of the ways of making code shorter and more maintainable. We are
# showing principles, and there are shorter and better ways of doing some
# of this, but we have to start somewhere!

print "Content-type: text/plain\n\n"

print "Greetings webby ruby world\n"
print "If it's Tuesday it must be ruby\n"
print "\nServer visits by category so far today ...\n\n"

logger = File.new "/home/wellho/logs/access_log","r"

counter = 0
terrible = ""

n200 = 0; n300 = 0; n400 = 0; n500 = 0

while hit = logger.gets
        # print hit
        parts = hit.split(" ")
        codeno = parts[8].to_i
        if codeno >= 500
                terrible = terrible + hit
                n500 = n500 + 1
        elsif codeno >= 400
                n400 = n400 + 1
        elsif codeno >= 300
                n300 = n300 + 1
                n200 = n200 + 1
        counter = counter + 1

puts "There are #{counter} log lines of which #{n200} were code 200s"
puts "There are #{counter} log lines of which #{n300} were code 300s"
puts "There are #{counter} log lines of which #{n400} were code 400s"
puts "There are #{counter} log lines of which #{n500} were code 500s"

if n500 > 0
        print "\nThere were server issues as follows\n#{terrible}"


The program finishes as __END__ so the rest is comments ... or in this
case an example output:

-bash-3.2$ ruby brightred
Content-type: text/plain

Greetings webby ruby world
If it's Tuesday it must be ruby

Server visits by category so far today ...

There are 11489 log lines of which 10182 were code 200s
There are 11489 log lines of which 165 were code 300s
There are 11489 log lines of which 1140 were code 400s
There are 11489 log lines of which 2 were code 500s

There were server issues as follows - - [13/Feb/2013:05:25:12 +0000] "CONNECT apis.google.com:443
HTTP/1.0" 500 666 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1;
Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ;
.NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR
3.5.30729)" - - [13/Feb/2013:06:22:23 +0000] "GET / HTTP/1.0" 500 666 "-"
"Wget/1.11.4 Red Hat modified"

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Ruby
 * Ruby Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Ruby are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Ruby on the Web" training module. You'll find a description of the topic and some other closely related examples on the "Ruby on the Web" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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The Horse's mouth provides a daily tip or thought.
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• All of these resources can be searched through through our search engine
• And there's a global index here.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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