Class: RequestLogAnalyzer::Tracker::Frequency

Inherits:
Base
  • Object
show all
Defined in:
lib/request_log_analyzer/tracker/frequency.rb

Overview

Catagorize requests by frequency. Count and analyze requests for a specific attribute

Options

  • :category Proc that handles the request categorization.

  • :if Proc that has to return !nil for a request to be passed to the tracker.

  • :line_type The line type that contains the duration field (determined by the category proc).

  • :nils Track undetermined methods.

  • :title Title do be displayed above the report.

  • :unless Proc that has to return nil for a request to be passed to the tracker.

The items in the update request hash are set during the creation of the Duration tracker.

Example output:

HTTP methods
----------------------------------------------------------------------
GET    |  22248 hits (46.2%) |=================
PUT    |  13685 hits (28.4%) |===========
POST   |  11662 hits (24.2%) |=========
DELETE |    512 hits (1.1%)  |

Instance Attribute Summary collapse

Attributes inherited from Base

#options

Instance Method Summary collapse

Methods inherited from Base

#create_lambda, #finalize, #initialize, #setup_should_update_checks!, #should_update?

Constructor Details

This class inherits a constructor from RequestLogAnalyzer::Tracker::Base

Instance Attribute Details

#categories ⇒ Object (readonly)

Returns the value of attribute categories.



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 25

def categories
  @categories
end

Instance Method Details

#frequency(cat) ⇒ Object

Return the amount of times a HTTP method has been encountered cat The HTTP method (:get, :put, :post or :delete)



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 49

def frequency(cat)
  categories[cat] || 0
end

#overall_frequency ⇒ Object

Return the overall frequency



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 54

def overall_frequency
  categories.inject(0) { |carry, item| carry + item[1] }
end

#prepare ⇒ Object

Check if categories are set up



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 28

def prepare
  raise "No categorizer set up for category tracker #{self.inspect}" unless options[:category]
  @categorizer = create_lambda(options[:category])
  
  # Initialize the categories. Use the list of category names to 
  @categories = {}
  options[:all_categories].each { |cat| @categories[cat] = 0 } if options[:all_categories].kind_of?(Enumerable)
end

#report(output) ⇒ Object

Generate a HTTP method frequency report to the given output object. Any options for the report should have been set during initialize. output The output object



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 66

def report(output)
  output.title(options[:title]) if options[:title]

  if @categories.empty?
    output << "None found.\n"
  else
    sorted_categories = output.slice_results(sorted_by_frequency)
    total_hits        = overall_frequency

    output.table({:align => :left}, {:align => :right }, {:align => :right}, {:type => :ratio, :width => :rest}) do |rows|
      sorted_categories.each do |(cat, count)|
        rows << [cat, "#{count} hits", '%0.1f%%' % ((count.to_f / total_hits.to_f) * 100.0), (count.to_f / total_hits.to_f)]
      end
    end

  end
end

#sorted_by_frequency ⇒ Object

Return the methods sorted by frequency



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 59

def sorted_by_frequency
  @categories.sort { |a, b| b[1] <=> a[1] }
end

#title ⇒ Object

Returns the title of this tracker for reports



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 91

def title
  options[:title] || 'Request frequency'
end

#to_yaml_object ⇒ Object

Returns a hash with the categories of every category that can be exported to YAML



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 85

def to_yaml_object
  return nil if @categories.empty?
  @categories
end

#update(request) ⇒ Object

Check HTTP method of a request and store that in the categories hash. request The request.



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# File 'lib/request_log_analyzer/tracker/frequency.rb', line 39

def update(request)
  cat = @categorizer.call(request)
  if cat || options[:nils]
    @categories[cat] ||= 0
    @categories[cat] += 1
  end
end