Class: Blazer::Result

Inherits:
Object
  • Object
show all
Defined in:
lib/blazer/result.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data_source, columns, rows, error, cached_at, just_cached) ⇒ Result

Returns a new instance of Result.



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# File 'lib/blazer/result.rb', line 5

def initialize(data_source, columns, rows, error, cached_at, just_cached)
  @data_source = data_source
  @columns = columns
  @rows = rows
  @error = error
  @cached_at = cached_at
  @just_cached = just_cached
end

Instance Attribute Details

#cached_at ⇒ Object (readonly)

Returns the value of attribute cached_at.



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# File 'lib/blazer/result.rb', line 3

def cached_at
  @cached_at
end

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/blazer/result.rb', line 3

def columns
  @columns
end

#data_source ⇒ Object (readonly)

Returns the value of attribute data_source.



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# File 'lib/blazer/result.rb', line 3

def data_source
  @data_source
end

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/blazer/result.rb', line 3

def error
  @error
end

#forecast_error ⇒ Object (readonly)

Returns the value of attribute forecast_error.



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# File 'lib/blazer/result.rb', line 3

def forecast_error
  @forecast_error
end

#just_cached ⇒ Object (readonly)

Returns the value of attribute just_cached.



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# File 'lib/blazer/result.rb', line 3

def just_cached
  @just_cached
end

#rows ⇒ Object (readonly)

Returns the value of attribute rows.



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# File 'lib/blazer/result.rb', line 3

def rows
  @rows
end

Instance Method Details

#anomaly?(series) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blazer/result.rb', line 174

def anomaly?(series)
  series = series.reject { |v| v[0].nil? }.sort_by { |v| v[0] }

  case Blazer.anomaly_checks
  when "prophet"
    df = Rover::DataFrame.new(series[0..-2].map { |v| {"ds" => v[0], "y" => v[1]} })
    m = Prophet.new(interval_width: 0.99)
    m.logger.level = ::Logger::FATAL # no logging
    m.fit(df)
    future = Rover::DataFrame.new(series[-1..-1].map { |v| {"ds" => v[0]} })
    forecast = m.predict(future).to_a[0]
    lower = forecast["yhat_lower"]
    upper = forecast["yhat_upper"]
    value = series.last[1]
    value < lower || value > upper
  when "trend"
    anomalies = Trend.anomalies(Hash[series])
    anomalies.include?(series.last[0])
  when "anomaly_detection"
    period = 7 # TODO determine period
    anomalies = AnomalyDetection.detect(Hash[series], period: period)
    anomalies.include?(series.last[0])
  else
    csv_str =
      CSV.generate do |csv|
        csv << ["timestamp", "count"]
        series.each do |row|
          csv << row
        end
      end

    r_script = %x[which Rscript].chomp
    type = series.any? && series.last.first.to_time - series.first.first.to_time >= 2.weeks ? "ts" : "vec"
    args = [type, csv_str]
    raise "R not found" if r_script.empty?
    command = "#{r_script} --vanilla #{File.expand_path("../detect_anomalies.R", __FILE__)} #{args.map { |a| Shellwords.escape(a) }.join(" ")}"
    output = %x[#{command}]
    if output.empty?
      raise "Unknown R error"
    end

    rows = CSV.parse(output, headers: true)
    error = rows.first && rows.first["x"]
    raise error if error

    timestamps = []
    if type == "ts"
      rows.each do |row|
        timestamps << Time.parse(row["timestamp"])
      end
      timestamps.include?(series.last[0].to_time)
    else
      rows.each do |row|
        timestamps << row["index"].to_i
      end
      timestamps.include?(series.length)
    end
  end
end

#boom ⇒ Object 



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# File 'lib/blazer/result.rb', line 22

def boom
  @boom ||= begin
    boom = {}
    columns.each_with_index do |key, i|
      smart_columns_data_source =
        ([data_source] + Array(data_source.settings["inherit_smart_settings"]).map { |ds| Blazer.data_sources[ds] }).find { |ds| ds.smart_columns[key] }

      if smart_columns_data_source
        query = smart_columns_data_source.smart_columns[key]
        res =
          if query.is_a?(Hash)
            query
          else
            values = rows.map { |r| r[i] }.compact.uniq
            result = smart_columns_data_source.run_statement(ActiveRecord::Base.send(:sanitize_sql_array, [query.sub("{value}", "(?)"), values]))
            result.rows
          end

        boom[key] = Hash[res.map { |k, v| [k.nil? ? k : k.to_s, v] }]
      end
    end
    boom
  end
end

#cached? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blazer/result.rb', line 18

def cached?
  cached_at.present?
end

#chart_type ⇒ Object 



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# File 'lib/blazer/result.rb', line 66

def chart_type
  @chart_type ||= begin
    if column_types.compact.size >= 2 && column_types.compact == ["time"] + (column_types.compact.size - 1).times.map { "numeric" }
      "line"
    elsif column_types == ["time", "string", "numeric"]
      "line2"
    elsif column_types == ["string", "numeric"] && @columns.last == "pie"
      "pie"
    elsif column_types.compact.size >= 2 && column_types == ["string"] + (column_types.compact.size - 1).times.map { "numeric" }
      "bar"
    elsif column_types == ["string", "string", "numeric"]
      "bar2"
    elsif column_types == ["numeric", "numeric"]
      "scatter"
    end
  end
end

#column_types ⇒ Object 



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# File 'lib/blazer/result.rb', line 47

def column_types
  @column_types ||= begin
    columns.each_with_index.map do |k, i|
      v = (rows.find { |r| r[i] } || {})[i]
      if boom[k]
        "string"
      elsif v.is_a?(Numeric)
        "numeric"
      elsif v.is_a?(Time) || v.is_a?(Date)
        "time"
      elsif v.nil?
        nil
      else
        "string"
      end
    end
  end
end

#detect_anomaly ⇒ Object 



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# File 'lib/blazer/result.rb', line 125

def detect_anomaly
  anomaly = nil
  message = nil

  if rows.empty?
    message = "No data"
  else
    if chart_type == "line" || chart_type == "line2"
      series = []

      if chart_type == "line"
        columns[1..-1].each_with_index.each do |k, i|
          series << {name: k, data: rows.map{ |r| [r[0], r[i + 1]] }}
        end
      else
        rows.group_by { |r| v = r[1]; (boom[columns[1]] || {})[v.to_s] || v }.each_with_index.map do |(name, v), i|
          series << {name: name, data: v.map { |v2| [v2[0], v2[2]] }}
        end
      end

      current_series = nil
      begin
        anomalies = []
        series.each do |s|
          current_series = s[:name]
          anomalies << s[:name] if anomaly?(s[:data])
        end
        anomaly = anomalies.any?
        if anomaly
          if anomalies.size == 1
            message = "Anomaly detected in #{anomalies.first}"
          else
            message = "Anomalies detected in #{anomalies.to_sentence}"
          end
        else
          message = "No anomalies detected"
        end
      rescue => e
        message = "#{current_series}: #{e.message}"
        raise e if Rails.env.development?
      end
    else
      message = "Bad format"
    end
  end

  [anomaly, message]
end

#forecast ⇒ Object

TODO cache it? don’t want to put result data (even hashed version) into cache without developer opt-in



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# File 'lib/blazer/result.rb', line 91

def forecast
  count = (@rows.size * 0.25).round.clamp(30, 365)

  case Blazer.forecasting
  when "prophet"
    require "prophet"
    forecast = Prophet.forecast(@rows.to_h, count: count)
  else
    require "trend"
    forecast = Trend.forecast(@rows.to_h, count: count)
  end

  # round integers
  if @rows[0][1].is_a?(Integer)
    forecast = forecast.map { |k, v| [k, v.round] }.to_h
  end

  @rows.each do |row|
    row[2] = nil
  end
  @rows.unshift(*forecast.map { |k, v| [k, nil, v] })
  @columns << "forecast"

  # reset cache
  @column_types = nil
  @chart_type = nil

  forecast
rescue => e
  @forecast_error = String.new("Error generating forecast")
  @forecast_error << ": #{e.message.sub("Invalid parameter: ", "")}"
  nil
end

#forecastable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blazer/result.rb', line 84

def forecastable?
  @forecastable ||= Blazer.forecasting && column_types == ["time", "numeric"] && @rows.size >= 10
end

#timed_out? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blazer/result.rb', line 14

def timed_out?
  error == Blazer::TIMEOUT_MESSAGE
end