Restructure omni services and add Chatwoot research snapshot

research/chatwoot/config/initializers/01_inject_enterprise_edition_module.rb

@@ -0,0 +1,87 @@
+# frozen_string_literal: true
+
+# original Authors: Gitlab
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/config/initializers/0_inject_enterprise_edition_module.rb
+#
+
+### Ref: https://medium.com/@leo_hetsch/ruby-modules-include-vs-prepend-vs-extend-f09837a5b073
+# Ancestors chain : it holds a list of constant names which are its ancestors
+#  example, by calling ancestors on the String class,
+#  String.ancestors => [String, Comparable, Object, PP::ObjectMixin, Kernel, BasicObject]
+#
+# Include: Ruby will insert the module into the ancestors chain of the class, just after its superclass
+# ancestor chain : [OriginalClass, IncludedModule, ...]
+#
+# Extend: class will actually import the module methods as class methods
+#
+# Prepend: Ruby will look into the module methods before looking into the class.
+# ancestor chain : [PrependedModule, OriginalClass, ...]
+########
+
+require 'active_support/inflector'
+
+module InjectEnterpriseEditionModule
+  def prepend_mod_with(constant_name, namespace: Object, with_descendants: false)
+    each_extension_for(constant_name, namespace) do |constant|
+      prepend_module(constant, with_descendants)
+    end
+  end
+
+  def extend_mod_with(constant_name, namespace: Object)
+    # rubocop:disable Performance/MethodObjectAsBlock
+    each_extension_for(
+      constant_name,
+      namespace,
+      &method(:extend)
+    )
+    # rubocop:enable Performance/MethodObjectAsBlock
+  end
+
+  def include_mod_with(constant_name, namespace: Object)
+    # rubocop:disable Performance/MethodObjectAsBlock
+    each_extension_for(
+      constant_name,
+      namespace,
+      &method(:include)
+    )
+    # rubocop:enable Performance/MethodObjectAsBlock
+  end
+
+  def prepend_mod(with_descendants: false)
+    prepend_mod_with(name, with_descendants: with_descendants)
+  end
+
+  def extend_mod
+    extend_mod_with(name)
+  end
+
+  def include_mod
+    include_mod_with(name)
+  end
+
+  private
+
+  def prepend_module(mod, with_descendants)
+    prepend(mod)
+
+    descendants.each { |descendant| descendant.prepend(mod) } if with_descendants
+  end
+
+  def each_extension_for(constant_name, namespace)
+    ChatwootApp.extensions.each do |extension_name|
+      extension_namespace =
+        const_get_maybe_false(namespace, extension_name.camelize)
+
+      extension_module =
+        const_get_maybe_false(extension_namespace, constant_name)
+
+      yield(extension_module) if extension_module
+    end
+  end
+
+  def const_get_maybe_false(mod, name)
+    mod&.const_defined?(name, false) && mod&.const_get(name, false)
+  end
+end
+
+Module.prepend(InjectEnterpriseEditionModule)