1 files changed, 93 insertions, 0 deletions
diff --git a/lib/temporary_user.rb b/lib/temporary_user.rb
new file mode 100644
index 0000000..2afae15
--- /dev/null
+++ b/lib/temporary_user.rb
@@ -0,0 +1,93 @@
+#
+# For users with login '*test_user*', we don't want to store these documents in
+# the main users db. This is because we create and destroy a lot of test
+# users. This weirdness of using a different db for some users breaks a lot of
+# things, such as associations. However, this is OK for now since we don't need
+# those for running the frequent nagios tests.
+#
+# This module is included in user.rb. This will only work if it is included
+# after designs are defined, otherwise, the design definition will overwrite
+# find_by_login().
+#
+
+module TemporaryUser
+  extend ActiveSupport::Concern
+  include CouchRest::Model::DatabaseMethod
+
+  USER_DB     = 'users'
+  TMP_USER_DB = 'tmp_users'
+  TMP_LOGIN   = 'tmp_user'  # created and deleted frequently
+  TEST_LOGIN  = 'test_user' # created, rarely deleted
+
+  included do
+    use_database_method :db_name
+
+    # since the original find_by_login is dynamically created with
+    # instance_eval, it appears that we also need to use instance eval to
+    # override it.
+    instance_eval <<-EOS, __FILE__, __LINE__ + 1
+      def find_by_login(*args)
+        if args.grep(/^#{TMP_LOGIN}/).any?
+          by_login.database(tmp_database).key(*args).first()
+        else
+          by_login.key(*args).first()
+        end
+      end
+    EOS
+  end
+
+  module ClassMethods
+    def get(id, db = database)
+      super(id, db) || super(id, tmp_database)
+    end
+    alias :find :get
+
+    # calls db_name(TMP_LOGIN), then creates a CouchRest::Database
+    # from the name
+    def tmp_database
+      choose_database(TMP_LOGIN)
+    end
+
+    def db_name(login=nil)
+      if !login.nil? && login.include?(TMP_LOGIN)
+        TMP_USER_DB
+      else
+        USER_DB
+      end
+    end
+
+    # create the tmp db if it doesn't exist.
+    # requires admin access.
+    def create_tmp_database!
+      design_doc.sync!(tmp_database.tap{|db|db.create!})
+    end
+
+    def is_tmp?(login)
+      !login.nil? && login =~ /^#{TMP_LOGIN}/
+    end
+
+    def is_test?(login)
+      !login.nil? && (login =~ /^#{TMP_LOGIN}/ || login =~ /^#{TEST_LOGIN}/)
+    end
+  end
+
+  #
+  # this gets called each and every time a User object needs to
+  # access the database.
+  #
+  def db_name
+    self.class.db_name(self.login)
+  end
+
+  # returns true if this User instance is stored in tmp db.
+  def is_tmp?
+    self.class.is_tmp?(self.login)
+  end
+
+  # returns true if this user is used for testing purposes
+  # (either a temporary or long lived)
+  def is_test?
+    self.class.is_test?(self.login)
+  end
+
+end