#!/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
        else
                n200 = n200 + 1
        end
        counter = counter + 1
end

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}"
end

__END__

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
79.138.204.49 - - [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)"
64.124.57.5 - - [13/Feb/2013:06:22:23 +0000] "GET / HTTP/1.0" 500 666 "-"
"Wget/1.11.4 Red Hat modified"
-bash-3.2$