feat: only print metrics warning once per thread

lib/pact/utils/metrics.rb

@@ -9,13 +9,17 @@ module Utils
  class Metrics
 
  def self.report_metric(event, category, action, value = 1)
+ do_once_per_thread(:pact_metrics_message_shown) do
+ if track_events?
+ Pact.configuration.output_stream.puts "pact WARN: Please note: we are tracking events anonymously to gather important usage statistics like Pact-Ruby version
+ and operating system. To disable tracking, set the 'PACT_DO_NOT_TRACK' environment
+ variable to 'true'."
+ end
+ end
+
  in_thread do
  begin
  if track_events?
- Pact.configuration.output_stream.puts "WARN: Please note: we are tracking events anonymously to gather important usage statistics like Pact-Ruby version
- and operating system. To disable tracking, set the 'PACT_DO_NOT_TRACK' environment
- variable to 'true'."
-
  uri = URI('https://www.google-analytics.com/collect')
  req = Net::HTTP::Post.new(uri)
  req.set_form_data(create_tracking_event(event, category, action, value))
@@ -31,6 +35,7 @@ def self.report_metric(event, category, action, value = 1)
  end
 
  private
+
  def self.handle_error e
  if ENV['PACT_METRICS_DEBUG'] == 'true'
  Pact.configuration.output_stream.puts("DEBUG: #{e.inspect}\n" + e.backtrace.join("\n"))
@@ -43,6 +48,16 @@ def self.in_thread
  end
  end
 
+ # not super safe to use the thread, but it's good enough for this usecase
+ def self.do_once_per_thread(key)
+ result = nil
+ if !Thread.current[key]
+ result = yield
+ end
+ Thread.current[key] = true
+ result
+ end
+
  def self.create_tracking_event(event, category, action, value)
  {
  "v" => 1,