utils: add analytics functions.

Library/Homebrew/utils.rb

@@ -5,6 +5,7 @@ require "utils/inreplace"
 require "utils/popen"
 require "utils/fork"
 require "utils/git"
+require "utils/analytics"
 require "open-uri"
 
 class Tty

Library/Homebrew/utils/analytics.rb

+
+def analytics_anonymous_prefix_and_os
+  @analytics_anonymous_prefix_and_os ||= begin
+    "#{OS_VERSION}, #{HOMEBREW_PREFIX.to_s.gsub(ENV["HOME"], "~")}"
+  end
+end
+
+def report_analytics(type, metadata={})
+  return unless ENV["HOMEBREW_ANALYTICS"]
+
+  metadata_args = metadata.map do |key, value|
+    ["-d", "#{key}=#{value}"] if key && value
+  end.compact.flatten
+
+  # Send analytics. Anonymise the IP address (aip=1) and don't send or store
+  # any personally identifiable information.
+  # https://developers.google.com/analytics/devguides/collection/protocol/v1/devguide
+  # https://developers.google.com/analytics/devguides/collection/protocol/v1/parameters
+  system "curl", "https://www.google-analytics.com/collect", "-d", "v=1",
+    "--silent", "--max-time", "3", "--output", "/dev/null",
+    "--user-agent", "#{HOMEBREW_USER_AGENT_CURL}",
+    "-d", "tid=#{ENV["HOMEBREW_ANALYTICS_ID"]}",
+    "-d", "cid=#{ENV["HOMEBREW_ANALYTICS_USER_UUID"]}",
+    "-d", "aip=1",
+    "-d", "an=Homebrew",
+    "-d", "av=#{HOMEBREW_VERSION}",
+    "-d", "t=#{type}",
+    *metadata_args
+end
+
+def report_analytics_event(category, action, label=analytics_anonymous_prefix_and_os, value=nil)
+  report_analytics(:event, {
+    :ec => category,
+    :ea => action,
+    :el => label,
+    :ev => value,
+  })
+end
+
+def report_analytics_exception(exception, options={})
+  if exception.is_a? BuildError
+    report_analytics_event("BuildError", e.formula.full_name)
+  end
+
+  fatal = options.fetch(:fatal, true) ? "1" : "0"
+  report_analytics(:exception, {
+    :exd => exception.class.name,
+    :exf => fatal,
+  })
+end
+
+def report_analytics_screenview(screen_name)
+  report_analytics(:screenview, :cd => screen_name)
+end