lib/mongo/crypt.rb in mongo-2.18.2 vs lib/mongo/crypt.rb in mongo-2.18.3

@@ -33,7 +33,18 @@
     autoload(:RewrapManyDataKeyResult, 'mongo/crypt/rewrap_many_data_key_result')
     autoload(:EncryptionIO, 'mongo/crypt/encryption_io')
     autoload(:ExplicitEncrypter, 'mongo/crypt/explicit_encrypter')
     autoload(:AutoEncrypter, 'mongo/crypt/auto_encrypter')
     autoload(:KMS, 'mongo/crypt/kms')
+
+    def validate_ffi!
+      return if defined?(FFI)
+
+      require 'ffi'
+    rescue LoadError => e
+      raise Error::UnmetDependency, 'Cannot enable encryption because the ffi gem ' \
+                                    "has not been installed. Add \"gem 'ffi'\" to your Gemfile and run " \
+                                    "\"bundle install\" to install the gem. (#{e.class}: #{e})"
+    end
+    module_function :validate_ffi!
   end
 end