Scaffolding

.gitignore

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+/.bundle/
+/.yardoc
+/Gemfile.lock
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+*.gem
+gemfiles/*.lock
+Gemfile.local

.rubocop.yml

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+require:
+  - rubocop-md
+
+AllCops:
+  Include:
+    - 'lib/**/*.rb'
+    - 'lib/**/*.rake'
+    - 'spec/**/*.rb'
+  Exclude:
+    - 'bin/**/*'
+    - 'gemfiles/**/*'
+    - 'spec/dummy/**/*'
+    - 'vendor/**/*'
+    - 'tmp/**/*'
+    - 'Rakefile'
+    - 'Gemfile'
+    - '*.gemspec'
+  DisplayCopNames: true
+  StyleGuideCopsOnly: false
+  TargetRubyVersion: 2.3
+
+Rails:
+  Enabled: false
+
+Style/SymbolArray:
+  Enabled: false
+
+Style/Documentation:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+Style/RegexpLiteral:
+  Enabled: false
+
+Style/BlockDelimiters:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Layout/SpaceInsideStringInterpolation:
+  EnforcedStyle: no_space
+
+Lint/AmbiguousRegexpLiteral:
+  Enabled: false
+
+Metrics/LineLength:
+  Max: 100
+
+Metrics/BlockLength:
+  Exclude:
+    - 'spec/**/*.rb'

.travis.yml

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+sudo: false
+language: ruby
+rvm:
+  - 2.5.0
+
+notifications:
+  email: false
+
+matrix:
+  fast_finish: true
+  include:
+    - rvm: ruby-head
+      gemfile: gemfiles/railsmaster.gemfile
+    - rvm: jruby-9.1.0.0
+      gemfile: gemfiles/jruby.gemfile
+    - rvm: 2.5.0
+      gemfile: Gemfile
+    - rvm: 2.4.3
+      gemfile: Gemfile
+    - rvm: 2.3.1
+      gemfile: gemfiles/activerecord42.gemfile
+  allow_failures:
+    - rvm: ruby-head
+      gemfile: gemfiles/railsmaster.gemfile
+    - rvm: jruby-9.1.0.0
+      gemfile: gemfiles/jruby.gemfile

CHANGELOG.md

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+# Change log
+
+## master
+
+[@palkan]: https://github.com/palkan

Gemfile

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+source "https://rubygems.org"
+
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
+
+# Specify your gem's dependencies in isolator.gemspec
+gemspec
+
+gem 'pry-byebug'
+gem 'sqlite3'
+gem 'activerecord', '>= 5.0'
+
+local_gemfile = 'Gemfile.local'
+
+if File.exist?(local_gemfile)
+  eval(File.read(local_gemfile)) # rubocop:disable Security/Eval
+end

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2018 Vladimir Dementyev
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+[![Gem Version](https://badge.fury.io/rb/isolator.svg)](https://badge.fury.io/rb/isolator)
+[![Build Status](https://travis-ci.org/palkan/isolator.svg?branch=master)](https://travis-ci.org/palkan/isolator)
+
+# Isolator
+
+Detect non-atomic interactions within DB transactions.
+
+Examples:
+
+```ruby
+# HTTP calls within transaction
+User.transaction do
+  user = User.new(user_params)
+  user.save!
+  # HTTP API call
+  PaymentsService.charge!(user)
+end
+
+#=> raises Isolator::HTTPError
+
+# background job
+User.transaction do
+  user.update!(confirmed_at: Time.now)
+  UserMailer.successful_confirmation(user).deliver_later
+end
+
+#=> raises Isolator::BackgroundJobError
+```
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+group :development, :test do
+  gem "isolator"
+end
+```
+
+## Usage
+
+TBD
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/palkan/isolator.
+
+## License
+
+The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).

Rakefile

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+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+require "rubocop/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+RuboCop::RakeTask.new
+
+task default: [:rubocop, :spec]

bin/console

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+#!/usr/bin/env ruby
+
+require "bundler/setup"
+require "isolator"
+
+require "pry"
+Pry.start

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+# Do any other automated setup that you need to do here

gemfiles/activerecord42.gemfile

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+source 'https://rubygems.org'
+
+gem 'activerecord', '~> 4.2'
+gem 'sqlite3'
+
+gemspec path: '..'

gemfiles/jruby.gemfile

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+source 'https://rubygems.org'
+
+gem 'activerecord-jdbcsqlite3-adapter', '~> 50.0'
+gem 'jdbc-sqlite3'
+gem 'activerecord', '~> 5.0.0'
+
+gemspec path: '..'

gemfiles/railsmaster.gemfile

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+source 'https://rubygems.org'
+
+gem 'arel', github: 'rails/arel'
+gem 'rails', github: 'rails/rails'
+gem 'sqlite3'
+
+gemspec path: '..'

isolator.gemspec

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+lib = File.expand_path("../lib", __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require "isolator/version"
+
+Gem::Specification.new do |spec|
+  spec.name          = "isolator"
+  spec.version       = Isolator::VERSION
+  spec.authors       = ["Vladimir Dementyev"]
+  spec.email         = ["[email protected]"]
+
+  spec.summary       = "Detect non-atomic interactions within DB transactions"
+  spec.description   = "Detect non-atomic interactions within DB transactions"
+  spec.homepage      = "https://github.com/palkan/isolator"
+  spec.license       = "MIT"
+
+  spec.required_ruby_version = ">= 2.3.0"
+
+  spec.files         = `git ls-files -z`.split("\x0").reject do |f|
+    f.match(%r{^(test|spec|features)/})
+  end
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 1.14"
+  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_development_dependency "rubocop", "~> 0.51"
+  spec.add_development_dependency "rubocop-md", "~> 0.2"
+end

lib/isolator.rb

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+# frozen_string_literal: true
+
+require "isolator/version"
+
+module Isolator # :nodoc:
+end

lib/isolator/version.rb

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+# frozen_string_literal: true
+
+module Isolator
+  VERSION = "0.0.1"
+end

spec/spec_helper.rb

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+# frozen_string_literal: true
+
+require "active_record"
+require "isolator"
+
+begin
+  require "pry-byebug"
+rescue LoadError # rubocop:disable Lint/HandleExceptions
+end
+
+Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each { |f| require f }
+
+RSpec.configure do |config|
+  config.example_status_persistence_file_path = ".rspec_status"
+  config.filter_run focus: true
+  config.run_all_when_everything_filtered = true
+
+  config.order = :random
+
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+
+  config.mock_with :rspec do |mocks|
+    mocks.verify_partial_doubles = true
+  end
+end

spec/support/active_record_init.rb

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+# frozen_string_literal: true
+
+require "activerecord-jdbc-adapter" if defined? JRUBY_VERSION
+require "activerecord-jdbcsqlite3-adapter" if defined? JRUBY_VERSION
+
+ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
+
+ActiveRecord::Schema.define do
+  # Create schema here
+end
+
+ActiveRecord::Base.logger = Logger.new(STDOUT) if ENV["LOG"]