Grep Rails log file targeting particular client/action

Wednesday, 10 March 2010 10:06

additions #/usr/bin/env-ruby if-argvempty-puts-ruby-lib

More info in my blog post Exploring Latest ruby-lib Additions



#!/usr/bin/env ruby



if ARGV.empty?

  puts <<-USAGE

Use like tail -f log/production.log | #{ $PROGRAM_NAME } request_regexp



Examples:



Show only local requests:

tail -f log/production.log | #{ $PROGRAM_NAME } 127.0.0.1



Show only GET requests:

tail -f log/production.log | #{ $PROGRAM_NAME } GET



Show only requests to /updates path:

tail -f log/production.log | #{ $PROGRAM_NAME } /updates

  USAGE

  exit(0)

end



request_regexp = /#{ ARGV[0] }/



STDIN.slice_before(/Started (GET|POST|PUT|DELETE)/).each do |request_log|

  puts request_log if request_log.first =~ request_regexp

end