replace gruff with svg-graph2

Gemfile

@@ -69,9 +69,7 @@ gem 'braintree', '~> 2.93'
 gem 'bugsnag', '~> 6.11'
 gem 'cancancan', '~> 2.3.0'
 gem 'formtastic', '~> 2.3.1'
-gem 'gruff', '~>0.3', require: false
 gem 'htmlentities', '~>4.3', '>= 4.3.4'
-gem 'rmagick', '~> 2.15.3', require: false
 # TODO: Not actively maintained https://github.com/activeadmin/inherited_resources#notice replace with respond_with and fix things the rails way
 gem 'inherited_resources', '~> 1.12.0'
 gem 'has_scope', '~> 0.7.2' # remove line after we stop supporting Ruby 2.4
@@ -100,6 +98,7 @@ gem 'json-schema', git: 'https://github.com/3scale/json-schema.git'
 gem 'paperclip', '~> 6.0'
 gem 'prawn'
 gem 'prawn-table', git: "https://github.com/prawnpdf/prawn-table.git", branch: "38b5bdb5dd95237646675c968091706f57a7a641"
+gem 'prawn-svg'
 gem 'rails_event_store', '~> 0.9.0', require: false
 gem 'ratelimit'
 gem 'recaptcha', '4.13.1', require: 'recaptcha/rails'
@@ -109,6 +108,7 @@ gem 'redis', '~> 4.1.3', require: ['redis', 'redis/connection/hiredis']
 gem 'redis-namespace', '~> 1.7.0'
 gem 'rest-client', '~> 2.0.2'
 gem 'rubyzip', '~>1.3.0', require: false
+gem 'svg-graph', require: false
 gem 'swagger-ui_rails', git: 'https://github.com/3scale/swagger-ui_rails.git', branch: 'dev'
 gem 'swagger-ui_rails2', git: 'https://github.com/3scale/swagger-ui_rails.git', branch: 'dev-2.1.3'
 gem 'thinking-sphinx', '~> 5.4.0'

Gemfile.lock

@@ -266,6 +266,8 @@ GEM
     crack (0.4.5)
       rexml
     crass (1.0.6)
+    css_parser (1.12.0)
+      addressable
     cucumber (7.0.0)
       builder (~> 3.2, >= 3.2.4)
       cucumber-core (~> 10.0, >= 10.0.1)
@@ -365,8 +367,6 @@ GEM
     github-markdown (0.6.9)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    gruff (0.7.0)
-      rmagick (~> 2.13, >= 2.13.4)
     has_scope (0.7.2)
       actionpack (>= 4.1)
       activesupport (>= 4.1)
@@ -528,6 +528,10 @@ GEM
     prawn (2.4.0)
       pdf-core (~> 0.9.0)
       ttfunk (~> 1.7)
+    prawn-svg (0.32.0)
+      css_parser (~> 1.6)
+      prawn (>= 0.11.1, < 3)
+      rexml (~> 3.2)
     prometheus-client-mmap (0.11.0)
     protected_attributes_continued (1.8.2)
       activemodel (>= 5.0)
@@ -653,7 +657,6 @@ GEM
       netrc (~> 0.8)
     rexml (3.2.5)
     riddle (2.4.3)
-    rmagick (2.15.4)
     roar (1.0.4)
       representable (>= 2.0.1, < 2.4.0)
     roar-rails (1.0.2)
@@ -792,6 +795,7 @@ GEM
     stripe (5.28.0)
     strong_migrations (0.6.8)
       activerecord (>= 5)
+    svg-graph (2.2.1)
     sys-uname (1.2.2)
       ffi (~> 1.1)
     temple (0.8.1)
@@ -949,7 +953,6 @@ DEPENDENCIES
   formtastic (~> 2.3.1)
   github-markdown
   globalid (~> 0.4.2)
-  gruff (~> 0.3)
   has_scope (~> 0.7.2)
   hashie
   hiredis (~> 0.6.3)
@@ -987,6 +990,7 @@ DEPENDENCIES
   pg (~> 0.21.0)
   pisoni (~> 1.29)
   prawn
+  prawn-svg
   prawn-table!
   protected_attributes_continued (~> 1.8.2)
   pry-byebug (>= 3.7.0)
@@ -1013,7 +1017,6 @@ DEPENDENCIES
   reek (= 6.01)
   reform (~> 2.0.3)
   rest-client (~> 2.0.2)
-  rmagick (~> 2.15.3)
   roar-rails
   rspec-html-matchers!
   rspec-rails (~> 4.1)
@@ -1045,6 +1048,7 @@ DEPENDENCIES
   statsd-ruby
   stripe (~> 5.28.0)
   strong_migrations (~> 0.6.8)
+  svg-graph
   swagger-ui_rails!
   swagger-ui_rails2!
   thin

app/lib/pdf/data.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'gruff'
-
 module Pdf
   class Data
 
@@ -74,74 +72,11 @@ def metrics
       end
     end
 
-    def traffic_graph
-      return if @hit_metric.nil?
-
-      data = @source.usage(@options)
-
-      g = Gruff::Line.new('1200x300')
-
-      g.theme = {
-        :colors => ['#9172EC', '#306EFF', '#000066', '#B4B4B4'],
-        :font_color => '#555',
-        :marker_color => '#eeeeee',
-        :background_colors => ['#ffffff', '#ffffff']
-      }
-
-      g.legend_box_size = 10
-      g.hide_title = true
-      g.legend_font_size = 13
-      g.hide_line_markers = false
-      g.marker_font_size = 13
-      g.hide_dots = false
-      g.dot_radius = 3
-      g.line_width = 2
-      g.marker_count = 5
-      g.margins = 2
-
-      g.sort = false
-      g.x_axis_label = @period == :day ? "Hour" : "Week Days"
-      g.y_axis_label = @hit_metric.friendly_name
-
-      data = data[:values]
-      g.data(@hit_metric.friendly_name, data)
-
-      max = data.max
-      g.maximum_value = max + (max / 5)
-
-      g.labels = send("#{@period}_labels")
-      StringIO.new(g.to_blob("JPG"))
+    def usage
+      @source.usage(@options) unless @hit_metric.nil?
     end
 
-    def week_labels
-      # Week report, there are 28 data points, at 6 hour intervals
-      # What was the date 1 week ago
-      date = 1.week.ago.beginning_of_day
-
-      #Gruff expects labels to be presented as a hash
-      labels= {}
-      (0..27).each do |point|
-        # Insert blanks except for every 4th data point (covering a 24hr period)
-        if (point % 4).zero?
-          labels[point] = date.strftime("%d %b")
-          date += 1.day
-        end
-      end
-
-      labels
-    end
-
-    def day_labels
-      # See week_labels
-      date = 1.day.ago.beginning_of_day
-
-      labels = {}
-      (0..23).each do |point|
-        labels[point] = date.strftime("%k:00") if (point % 4).zero?
-        date += 1.hour
-      end
-      labels
-    end
+    private
 
     def sanitize_text(text)
       EscapeUtils.escape_javascript(text.to_s)

app/lib/pdf/report.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+require 'SVG/Graph/DataPoint'
+require 'SVG/Graph/Line'
+
 # REFACTOR: extract abstract Report class, and DRY functionality with InvoiceReporter
 module Pdf
   class Report
@@ -35,6 +38,7 @@ def generate
 
       header
 
+      move_down 3
       traffic_graph
       move_down 3
 
@@ -128,11 +132,158 @@ def traffic_and_users
       end
     end
 
+    def graph_key_formatter(usage)
+      if @period == :day
+        ->(point) { (point % 4).zero? ? "" : sprintf("%02d:00", point) }
+      else
+        since = Time.parse(usage.dig(:period, :since))
+        granularity = usage.dig(:period, :granularity)
+        ->(point) { (point % 4).zero? ? "" : (since + point * granularity).strftime("%d %b") }
+      end
+    end
+
     def traffic_graph
-      graph = @data.traffic_graph
-      return unless graph
-      subtitle "Traffic"
-      @pdf.image graph, position: :left, width: 520
+      usage = @data.usage
+
+      return unless usage
+
+      options = {
+        graph_title: "Traffic",
+        show_graph_title: true,
+        key: false,
+        area_fill: false,
+        show_data_values: false,
+        add_popups: false,
+        width: TABLE_FULL_WIDTH,
+        height: TABLE_FULL_WIDTH / 4,
+        step_x_labels: 4,
+        step_include_first_x_label: true,
+        fields: usage[:values].each_index.map(&:succ).map(&graph_key_formatter(usage)),
+        show_x_title: false,
+        x_title: @period == :day ? "Hour" : "Week Days",
+        show_y_guidelines: true,
+        scale_integers: true,
+        scale_divisions: [2, (usage[:values].max - usage[:values].min) / 5].max,
+        number_format: IntegerWithDelimiterFormatter.new,
+        show_y_title: false,
+        y_title: usage.dig(:metric, :name),
+        y_title_location: :middle,
+        no_css: false,
+      }
+
+      graph = SVG::Graph::Line.new(options)
+
+      graph.add_data(data: usage[:values], title: options[:y_title])
+
+      @pdf.svg traffic_graph_style(graph.burn_svg_only)
+    end
+
+    def traffic_graph_style(svg)
+      xml = Nokogiri::XML(svg)
+      style = xml.at_css("style")
+      css = CssParser::Parser.new
+      css.load_string!(style.text.gsub(/ff0000/i, "9273ED"))
+      traffic_graph_first_data_point(xml)
+      traffic_graph_y_align(xml)
+      traffic_graph_style_clean_up(css)
+      traffic_graph_style_guide_lines(css)
+      traffic_graph_style_axes(css)
+      traffic_graph_style_line_width(css)
+      traffic_graph_style_background(css)
+      traffic_graph_style_text(css)
+
+      style.content = css.to_s
+      xml.to_s
+    end
+
+    # TODO: remove this hack ofter fix is acepted upstream
+    #       https://github.com/lumean/svg-graph2/pull/43
+    def traffic_graph_first_data_point(xml)
+      line = xml.at_css(".line1")
+      line[:d] = line[:d].sub(/^M.+L\s*(\S+\s+\S+)(.*)$/, 'M\1 L\2')
+    end
+
+    # TODO: remove this hack after fix is accepted upstream
+    #       https://github.com/lumean/svg-graph2/pull/44
+    def traffic_graph_y_align(xml)
+      xml.css(".yAxisLabels").each do |label|
+        label[:x] = "-8"
+        label.delete("style")
+        label.delete("transform")
+      end
+    end
+
+    def traffic_graph_style_background(css)
+      desired = <<-EOT
+      .graphBackground { 
+        fill:#ffffff;
+      }
+      EOT
+
+      css.remove_rule_set!(css.find_rule_sets([".graphBackground"]).first)
+      css.add_block!(desired)
+    end
+
+    def traffic_graph_style_text(css)
+      desired = <<-EOT
+        .xAxisLabels,.yAxisLabels {
+          fill:#909090;
+          font-size: 10px;
+          font-family: "#{@style[:font]}", sans-serif; font-weight: normal;
+        }
+        .mainTitle {
+          fill:#505050;
+          font-family: "#{@style[:font]}", sans-serif; font-weight: normal;
+        }
+      EOT
+
+      css.add_block!(desired)
+    end
+
+    def traffic_graph_style_axes(css)
+      desired = <<-EOT
+      .axis{
+        stroke: #ffffff;
+        stroke-width: 0px;
+      }
+      EOT
+
+      css.remove_rule_set!(css.find_rule_sets([".axis"]).first)
+      css.add_block!(desired)
+    end
+
+    def traffic_graph_style_line_width(css)
+      desired = <<-EOT
+      .line1 {
+        stroke-width: 2px;
+      }
+      EOT
+
+      css.add_block!(desired)
+    end
+
+    def traffic_graph_style_guide_lines(css)
+      desired = <<-EOT
+      .guideLines,#yAxis {
+        stroke: #eeeeee;
+        stroke-width: 0.3px;
+        stroke-dasharray: 0.01 1;
+        stroke-linejoin: round;
+        stroke-linecap: round;
+      }
+      EOT
+
+      css.remove_rule_set!(css.find_rule_sets([".guideLines"]).first)
+      css.add_block!(desired)
+    end
+
+    def traffic_graph_style_clean_up(css)
+      (2..12).each do |num|
+        %w[line fill key dataPoint].each do |type|
+          rule = css.find_rule_sets([".#{type}#{num}"]).first
+          css.remove_rule_set!(rule) if rule.present?
+        end
+      end
     end
 
     def metrics
@@ -189,5 +340,13 @@ def colorize_num(numstr)
         { content: numstr, **@style[:green] }
       end
     end
+
+    class IntegerWithDelimiterFormatter
+      include ActionView::Helpers::NumberHelper
+
+      def %(num)
+        number_with_delimiter(num.to_i)
+      end
+    end
   end
 end

config/initializers/prawn.rb

@@ -1,7 +1,4 @@
-# require 'prawn'
-# require 'prawn/format'
 require "prawn/measurement_extensions"
-require 'gruff'
 require "open-uri"
 
 module Prawn