Class: LogwormCompute

Inherits:
Object
  • Object
show all
Defined in:
lib/logworm_utils/compute.rb

Instance Method Summary collapse

Constructor Details

#initialize(table, function, field, options) ⇒ LogwormCompute

Returns a new instance of LogwormCompute.



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# File 'lib/logworm_utils/compute.rb', line 2

def initialize(table, function, field, options)
  @table    = table
  @function = function
  @field    = field
  @options  = options

  @valuefield = @field ? "#{@function}(#{@field})" : @function

  begin
    @db    = Logworm::DB.from_config_or_die(@options[:app])
    spec   = {:aggregate_function => @function, :aggregate_argument => @field}.merge(@options)
    @query = Logworm::QueryBuilder.new(spec)
  rescue Exception => e
    $stderr.puts "There was an error: #{e}"
    exit(-1)
  end
  
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/logworm_utils/compute.rb', line 21

def run
  # Create a resource for the query
  begin
    query_data = @db.query(@table, @query.to_json)
    url = query_data["results_uri"]
    rows = @db.results(url + "?nocache=1")["results"]
  rescue Logworm::DatabaseException, Logworm::ForbiddenAccessException  => e
    $stderr.puts "Error: #{e}"
    exit(-1)
  rescue Logworm::InvalidQueryException => e
    $stderr.puts "#{e}, #{@query.to_json}"  
    exit(-1)
  rescue Exception  => e
    $stderr.puts "Error: #{e}"
    exit(-1)
  end

  if @options[:debug]
    puts "logworm query: #{@query.to_json}"
    puts "logworm query url: #{query_data["self_uri"]}"
    puts "logworm results url: #{url}"
    puts
  end
    
  if @query.groups.length > 0
    results = {}
    rows.each do |r|
      grp = []
      @query.groups.each do |g|
        grp << "#{g}:#{r[g]}"
      end
      key = "[#{grp.join(', ')}]"
      value = r[@function]
      results[key] = {:value => value, :keys => r.dup}
      results[key][:keys].delete(@function)
    end
    results.keys.sort.each do |k|
      puts "#{k} \t ==> #{@valuefield} = #{results[k][:value]}"
    end
  else
    puts "#{@valuefield} = #{rows.first[@function]}"
  end
  
end