Add #to_h method

(cherry picked from commit c7ec35291dc89b68351a059eec8fd66669ecf1e9)

lib/anyway/config.rb

@@ -2,11 +2,13 @@
 
 require 'anyway/ext/class'
 require 'anyway/ext/deep_dup'
+require 'anyway/ext/deep_freeze'
 require 'anyway/ext/hash'
 
 module Anyway # :nodoc:
   using Anyway::Ext::Class
   using Anyway::Ext::DeepDup
+  using Anyway::Ext::DeepFreeze
   using Anyway::Ext::Hash
 
   # Base config class
@@ -95,6 +97,12 @@ def load_from_env(config)
       config
     end
 
+    def to_h
+      self.class.config_attributes.each_with_object({}) do |key, obj|
+        obj[key.to_sym] = send(key)
+      end.deep_dup.deep_freeze
+    end
+
     private
 
     def set_value(key, val)

lib/anyway/ext/deep_freeze.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module Anyway
+  module Ext
+    # Add #deep_freeze to hashes and arrays
+    module DeepFreeze
+      refine ::Hash do
+        def deep_freeze
+          freeze
+          each_value do |value|
+            value.deep_freeze if value.is_a?(::Hash) || value.is_a?(::Array)
+          end
+        end
+      end
+
+      refine ::Array do
+        def deep_freeze
+          freeze
+          each do |value|
+            value.deep_freeze if value.is_a?(::Hash) || value.is_a?(::Array)
+          end
+        end
+      end
+    end
+  end
+end

spec/config_spec.rb

@@ -26,6 +26,25 @@
       expect(conf).to respond_to(:user)
     end
 
+    describe "#to_h" do
+      subject(:config) { CoolConfig.new }
+
+      it "returns deeply frozen hash" do
+        hashed = config.to_h
+
+        expect(hashed).to be_a(Hash)
+        expect(hashed).to be_frozen
+        expect(hashed[:user]).to be_frozen
+      end
+
+      it "returns new hash every time" do
+        hashed = config.to_h
+        hashed2 = config.to_h
+
+        expect(hashed).to be_eql(hashed2)
+      end
+    end
+
     describe "load from files" do
       it "set defaults" do
         expect(conf.port).to eq 8080

spec/ext/deep_freeze_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'anyway/ext/deep_freeze'
+
+describe Anyway::Ext::DeepFreeze do
+  using Anyway::Ext::DeepFreeze
+
+  it "freezes nested arrays and hashes", :aggregate_failures do
+    source = {
+      a: 1,
+      b: 'hello',
+      c: {
+        id: 1,
+        list: [1, 2, { name: 'John' }]
+      },
+      d: [{ id: 1 }, { id: 2 }]
+    }
+
+    dup = source.deep_freeze
+
+    expect(dup).to be_frozen
+    expect(dup[:c]).to be_frozen
+    expect(dup[:d]).to be_frozen
+
+    expect(dup[:c][:list]).to be_frozen
+    expect(dup[:c][:list].last).to be_frozen
+
+    expect(dup[:d].first).to be_frozen
+    expect(dup[:d].last).to be_frozen
+  end
+end