Class: Maze::MetricsProcessor

Inherits:
Object
  • Object
show all
Defined in:
lib/maze/metrics_processor.rb

Instance Method Summary collapse

Constructor Details

#initialize(metrics) ⇒ MetricsProcessor

Returns a new instance of MetricsProcessor.

Parameters:

  • metrics (RequestList) —

    The metrics to be processed



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# File 'lib/maze/metrics_processor.rb', line 6

def initialize(metrics)
  @metrics = metrics
  @columns = Set.new
  @rows = []
end

Instance Method Details

#collate ⇒ Object

Organises the raw metrics into an Array of hashes representing each row of the CSV, whilst also capturing an overall set of column headings



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# File 'lib/maze/metrics_processor.rb', line 22

def collate
  @metrics.all.each do |request|
    row = {}
    metric = request[:body]
    metric.each do |key, value|
      @columns.add key
      row[key] = value
    end
    @rows << row
  end
end

#process ⇒ Object

Collates the metrics given into a CSV-friendly structure and writes the CSV to disk



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# File 'lib/maze/metrics_processor.rb', line 13

def process
  return if @metrics.size_all == 0

  collate
  write_to_disk
end

#to_csv_friendly(value) ⇒ Object 



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# File 'lib/maze/metrics_processor.rb', line 60

def to_csv_friendly(value)
  return value unless value.class == String

  if value.include?(' ') || value.include?(',')
    "\"#{value}\""
  else
    value
  end
end

#write_to_disk ⇒ Object 



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# File 'lib/maze/metrics_processor.rb', line 34

def write_to_disk
  filepath = File.join(Dir.pwd, 'maze_output', 'metrics.csv')

  puts "Call with #{filepath}"

  File.open(filepath, 'w') do |file|
    # Write the header, with columns ordered alphabetically
    sorted_columns = @columns.to_a.sort!
    header = sorted_columns.join ','
    file.puts header

    # Write the rows
    @rows.each do |row|
      row_values = sorted_columns.map do |column|
        if row.has_key? column
          to_csv_friendly(row[column])
        else
          ''
        end
      end

      file.puts row_values.join ','
    end
  end
end