Added service

Author: bezrukavyi

.gitignore

@@ -7,3 +7,4 @@
 /pkg/
 /spec/reports/
 /tmp/
+.ruby-gemset

.rspec

@@ -0,0 +1,3 @@
+--require spec_helper
+--format documentation
+--color

.rubocop.yml

@@ -2,7 +2,7 @@ AllCops:
   DisplayCopNames:    true
   DisplayStyleGuide:  true
   StyleGuideCopsOnly: true
-  TargetRubyVersion:  2.3
+  TargetRubyVersion:  2.4.1
 
 Metrics/LineLength:
   Max: 120
@@ -18,4 +18,4 @@ Style/FileName:
 
 Metrics/ModuleLength:
   Exclude:
-    - spec/**/*_spec.rb
+    - spec/**/*_spec.rb

circle.yml

@@ -1,3 +1,3 @@
 machine:
   ruby:
-    version: 2.3.4
+    version: 2.4.1

lib/operators/service.rb

@@ -1,7 +1,43 @@
-require "operators/service/version"
+require 'dry-monads'
 
 module Operators
-  module Service
-    # Your code goes here...
+  class Service
+    def self.rescue_callbacks(*exceptions)
+      define_method :call do
+        begin
+          calling
+        rescue *exceptions => error
+          failure(error.message)
+        end
+      end
+    end
+
+    rescue_callbacks
+
+    def self.call(*args)
+      new(*args).call
+    end
+
+    def success(result = nil)
+      Dry::Monads.Right(success_wrap(result))
+    end
+
+    def failure(result = nil)
+      Dry::Monads.Left(error_wrap(result))
+    end
+
+    private
+
+    def error_wrap(result)
+      result
+    end
+
+    def success_wrap(result)
+      result
+    end
+
+    def calling
+      raise 'Must be redefined'
+    end
   end
 end

lib/operators/service/version.rb

@@ -0,0 +1 @@
+require "operators/service"

lib/operators_service.rb

@@ -1,29 +1,28 @@
 # coding: utf-8
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'operators/service/version'
 
 Gem::Specification.new do |spec|
-  spec.name          = "operators-service"
-  spec.version       = Operators::Service::VERSION
-  spec.authors       = ["Kirill Shevchenko"]
-  spec.email         = ["[email protected]"]
+  spec.name          = 'operators-service'
+  spec.version       = '0.1.1'
+  spec.authors       = ['Yaroslav Bezrukavyi', 'Kirill Shevchenko']
+  spec.email         = ['[email protected]', '[email protected]']
 
-  spec.summary       = %q{operators-service}
-  spec.description   = %q{operators-service}
-  spec.homepage      = "http://operators-rb.org"
-  spec.license       = "MIT"
+  spec.summary       = 'You will always know the type of the result'
+  spec.description   = 'Service is based on Dry::Monads'
+  spec.homepage      = 'http://operators-rb.org'
+  spec.license       = 'MIT'
 
-  spec.files         = `git ls-files -z`.split("\x0").reject do |f|
-    f.match(%r{^(test|spec|features)/})
-  end
-  spec.bindir        = "exe"
+  spec.files         = `git ls-files -z`.split("\x0")
+  spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
-  spec.require_paths = ["lib"]
+  spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.13'
+  spec.add_dependency 'dry-monads', '~> 0.3.1'
+
+  spec.add_development_dependency 'bundler', '~> 1.15.4'
   spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'rspec', '~> 3.5.0'
+  spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'byebug', '~> 3.5.0'
   spec.add_development_dependency 'rubocop', '~> 0.48.0'
 end

operators-service.gemspec

@@ -0,0 +1,46 @@
+RSpec.describe Operators::Service do
+  before do
+    class TestSerivce < Operators::Service
+      rescue_callbacks SyntaxError
+
+      def initialize(data, result)
+        @data = data
+        @result = result
+      end
+
+      def calling
+        @result ? success(@data) : failure(@data)
+      end
+
+      def except_error(error)
+        raise error
+      end
+    end
+  end
+
+  it 'success result' do
+    result = TestSerivce.call('data', true)
+    expect(result.success?).to be_truthy
+  end
+
+  it 'failure result' do
+    result = TestSerivce.call('data', false)
+    expect(result.success?).to be_falsey
+  end
+
+  context 'catch error' do
+    subject { TestSerivce.new('error', true) }
+
+    it 'catch' do
+      allow(subject).to receive(:calling).and_raise(SyntaxError)
+
+      expect(subject.call.failure?).to be_truthy
+    end
+
+    it 'not catch' do
+      allow(subject).to receive(:calling).and_raise(LoadError)
+
+      expect { subject.call }.to raise_exception(LoadError)
+    end
+  end
+end

spec/operators/service_spec.rb

@@ -0,0 +1,9 @@
+require 'bundler/setup'
+require 'byebug'
+require 'operators/service'
+
+RSpec.configure do |config|
+  config.order = :random
+  config.filter_run focus: true
+  config.run_all_when_everything_filtered = true
+end