Dashboard modernization

.gitignore

@@ -5,6 +5,7 @@ pkg/*
 *.rbc
 .idea
 coverage
+node_modules
 issues.rtf
 dump.rdb
 .gitignore

README.md

@@ -168,6 +168,8 @@ If you have an experiment called `button_color` with alternatives called `red` a
 
 will always have red buttons. This won't be stored in your session or count towards to results, unless you set the `store_override` configuration option.
 
+The dashboard's "Force for current user" button does the same thing for your browser, by setting a `split_override` cookie. Because an override is not counted, an experiment you have pinned can keep reading zero participants. The dashboard lists any overrides active in your browser at the top of the page, and lets you clear them individually or all at once.
+
 In the event you want to disable all tests without having to know the individual experiment names, add a `SPLIT_DISABLE` query parameter.
 
     http://myawesomesite.com?SPLIT_DISABLE=true

eslint.config.js

@@ -0,0 +1,22 @@
+const js = require("@eslint/js");
+const globals = require("globals");
+
+module.exports = [
+  { ignores: ["coverage/"] },
+  js.configs.recommended,
+  {
+    files: ["lib/**/*.js"],
+    languageOptions: {
+      globals: globals.browser
+    },
+    rules: {
+      "no-empty": ["error", { allowEmptyCatch: true }]
+    }
+  },
+  {
+    files: ["eslint.config.js"],
+    languageOptions: {
+      globals: globals.node
+    }
+  }
+];

lib/split.rb

@@ -30,6 +30,8 @@ module Split
   extend self
   attr_accessor :configuration
 
+  OVERRIDE_COOKIE_NAME = "split_override"
+
   # Accepts:
   #   1. A redis URL (valid for `Redis.new(url: url)`)
   #   2. an options hash compatible with `Redis.new`

lib/split/dashboard.rb

@@ -3,6 +3,7 @@
 require "sinatra/base"
 require "split"
 require "bigdecimal"
+require "split/dashboard/experiment"
 require "split/dashboard/helpers"
 require "split/dashboard/pagination_helpers"
 
@@ -44,9 +45,21 @@ class Dashboard < Sinatra::Base
       experiment = Split::ExperimentCatalog.find(params[:experiment])
       alternative = Split::Alternative.new(params[:alternative], experiment.name)
 
-      cookies = JSON.parse(request.cookies["split_override"]) rescue {}
-      cookies[experiment.name] = alternative.name
-      response.set_cookie("split_override", { value: cookies.to_json, path: "/" })
+      write_overrides(active_overrides.merge(experiment.name => alternative.name))
+
+      redirect url("/")
+    end
+
+    post "/clear_override" do
+      overrides = active_overrides
+      overrides.delete(params[:experiment])
+      write_overrides(overrides)
+
+      redirect url("/")
+    end
+
+    post "/clear_overrides" do
+      response.delete_cookie(Split::OVERRIDE_COOKIE_NAME, path: "/")
 
       redirect url("/")
     end

lib/split/dashboard/experiment.rb

@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require "forwardable"
+
+module Split
+  class DashboardExperiment
+    def initialize(experiment, goal = nil)
+      @experiment = experiment
+      @goal = goal
+    end
+
+    def alternatives
+      @alternatives ||= @experiment.alternatives.map do |alternative|
+        DashboardAlternative.new(alternative, @experiment, @goal)
+      end
+    end
+
+    def extra_columns
+      @extra_columns ||= alternatives.flat_map { |alternative| alternative.extra_info.keys }.uniq
+    end
+
+    def extra_totals
+      @extra_totals ||= extra_columns.to_h do |column|
+        values = alternatives.map { |alternative| alternative.extra_info[column] }.compact
+        [column, values.any? && values.all?(Numeric) ? values.sum : "N/A"]
+      end
+    end
+
+    def total_participants
+      alternatives.sum(&:participants)
+    end
+
+    def total_unfinished
+      alternatives.sum(&:unfinished)
+    end
+
+    def total_completed
+      alternatives.sum(&:completed)
+    end
+  end
+
+  class DashboardAlternative
+    extend Forwardable
+    def_delegators :@alternative, :name, :control?
+
+    attr_reader :participants, :unfinished, :completed, :extra_info
+
+    def initialize(alternative, experiment, goal = nil)
+      @alternative = alternative
+      @experiment = experiment
+      @goal = goal
+
+      @participants = alternative.participant_count
+      @unfinished = alternative.unfinished_count
+      @completed = alternative.completed_count(goal)
+      @extra_info = alternative.extra_info
+    end
+
+    def conversion_rate
+      @conversion_rate ||= @alternative.conversion_rate(@goal)
+    end
+
+    def conversion_delta
+      return if control?
+
+      control_rate = @experiment.control.conversion_rate(@goal)
+      return if control_rate <= 0 || conversion_rate == control_rate
+
+      conversion_rate / control_rate - 1
+    end
+
+    def z_score
+      @z_score ||= @alternative.z_score(@goal)
+    end
+
+    def p_winner
+      @p_winner ||= @alternative.p_winner(@goal)
+    end
+
+    def winner?
+      @experiment.winner.name == name
+    end
+  end
+end