DEV: add frozen_string_literal

This helps avoid uneeded string allocations

Also:

- Add rubocop to travis
- Bump version

.travis

@@ -7,3 +7,4 @@ rvm:
  - 2.5
  - 2.6
  - jruby
+script: bach -c "bundle exec rubocop && bundle exec rake"

CHANGELOG

@@ -1,3 +1,8 @@
+0.4.11 - 15-05-2019
+
+- Fix: Handle stopping nil worker_threads in Client
+- Dev: add frozen string literals
+
 0.4.10 - 29-04-2019
 
 - Fix: Custom label support for puma collector

Gemfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }

Guardfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 guard :minitest do
   # with Minitest::Unit
   watch(%r{^test/(.*)\/?(.*)_test\.rb$})

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 require "rake/testtask"
 

bench/bench.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative '../lib/prometheus_exporter'
 require_relative '../lib/prometheus_exporter/client'
 require_relative '../lib/prometheus_exporter/server'

bin/prometheus_exporter

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'optparse'
 

examples/custom_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MyCustomCollector < PrometheusExporter::Server::Collector
   def initialize
     @gauge1 = PrometheusExporter::Metric::Gauge.new("thing1", "I am thing 1")

lib/prometheus_exporter.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "prometheus_exporter/version"
 require "json"
 require "thread"

lib/prometheus_exporter/instrumentation.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "instrumentation/process"
 require_relative "instrumentation/method_profiler"
 require_relative "instrumentation/sidekiq"

lib/prometheus_exporter/instrumentation/delayed_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Instrumentation
   class DelayedJob
     JOB_CLASS_REGEXP = %r{job_class: (\w+:{0,2})+}.freeze

lib/prometheus_exporter/instrumentation/method_profiler.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # see https://samsaffron.com/archive/2017/10/18/fastest-way-to-profile-a-method-in-ruby
 module PrometheusExporter::Instrumentation; end
 

lib/prometheus_exporter/instrumentation/puma.rb

@@ -1,4 +1,6 @@
-require 'json'
+# frozen_string_literal: true
+
+require "json"
 
 # collects stats from puma
 module PrometheusExporter::Instrumentation
@@ -30,7 +32,7 @@ module PrometheusExporter::Instrumentation
     def collect_puma_stats(metric)
       stats = JSON.parse(::Puma.stats)
 
-      if stats.key? 'workers'
+      if stats.key?("workers")
         metric[:phase] = stats["phase"]
         metric[:workers_total] = stats["workers"]
         metric[:booted_workers_total] = stats["booted_workers"]

lib/prometheus_exporter/instrumentation/unicorn.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 begin
   require 'raindrops'
 rescue LoadError

lib/prometheus_exporter/metric.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "metric/base"
 require_relative "metric/counter"
 require_relative "metric/gauge"

lib/prometheus_exporter/server.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "metric"
 require_relative "server/type_collector"
 require_relative "server/web_collector"

lib/prometheus_exporter/server/collector_base.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Server
 
   # minimal interface to implement a customer collector

lib/prometheus_exporter/server/delayed_job_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Server
   class DelayedJobCollector < TypeCollector
 

lib/prometheus_exporter/server/hutch_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Server
   class HutchCollector < TypeCollector
 

lib/prometheus_exporter/server/puma_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Server
   class PumaCollector < TypeCollector
     PUMA_GAUGES = {

lib/prometheus_exporter/server/runner.rb

@@ -1,10 +1,11 @@
 # frozen_string_literal: true
+
 require 'prometheus_exporter/client'
 require_relative '../instrumentation/unicorn'
 
 module PrometheusExporter::Server
-  class RunnerException < StandardError; end;
-  class WrongInheritance < RunnerException; end;
+  class RunnerException < StandardError; end
+  class WrongInheritance < RunnerException; end
 
   class Runner
     def initialize(options = {})

lib/prometheus_exporter/server/sidekiq_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Server
   class SidekiqCollector < TypeCollector
 

lib/prometheus_exporter/server/type_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter::Server
   class TypeCollector
     def type

lib/prometheus_exporter/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module PrometheusExporter
-  VERSION = "0.4.10"
+  VERSION = "0.4.11"
 end

test/custom_type_collector.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CustomTypeCollector < PrometheusExporter::Server::TypeCollector
   def type
     "custom1"

test/metric/base_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/metric'
 

test/metric/counter_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/metric'
 

test/metric/gauge_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/metric'
 

test/metric/histogram_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/metric'
 

test/metric/summary_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/metric'
 

test/middleware_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test_helper"
 require 'rack/test'
 require 'prometheus_exporter/middleware'

test/prometheus_exporter_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test_helper"
 
 class PrometheusExporterTest < Minitest::Test

test/server/collector_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'mini_racer'
 require 'prometheus_exporter/server'
@@ -283,7 +285,7 @@ class PrometheusCollectorTest < Minitest::Test
 
   def test_it_can_collect_puma_metrics
     collector = PrometheusExporter::Server::Collector.new
-    client = PipedClient.new(collector, custom_labels: { service: 'service1' } )
+    client = PipedClient.new(collector, custom_labels: { service: 'service1' })
 
     mock_puma = Minitest::Mock.new
     mock_puma.expect(

test/server/runner_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/server'
 

test/server/unicorn_collector_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'mini_racer'
 require 'prometheus_exporter/server'

test/server/web_collector_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'mini_racer'
 require 'prometheus_exporter/server'

test/server/web_server_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'prometheus_exporter/server'
 require 'prometheus_exporter/client'

test/test_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 require "prometheus_exporter"