diff options
Diffstat (limited to 'lib/gitlab/utils/deep_size.rb')
-rw-r--r-- | lib/gitlab/utils/deep_size.rb | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/gitlab/utils/deep_size.rb b/lib/gitlab/utils/deep_size.rb new file mode 100644 index 00000000000..562cf09e249 --- /dev/null +++ b/lib/gitlab/utils/deep_size.rb @@ -0,0 +1,79 @@ +# frozen_string_literal: true + +require 'objspace' + +module Gitlab + module Utils + class DeepSize + Error = Class.new(StandardError) + TooMuchDataError = Class.new(Error) + + DEFAULT_MAX_SIZE = 1.megabyte + DEFAULT_MAX_DEPTH = 100 + + def initialize(root, max_size: DEFAULT_MAX_SIZE, max_depth: DEFAULT_MAX_DEPTH) + @root = root + @max_size = max_size + @max_depth = max_depth + @size = 0 + @depth = 0 + + evaluate + end + + def valid? + !too_big? && !too_deep? + end + + private + + def evaluate + add_object(@root) + rescue Error + # NOOP + end + + def too_big? + @size > @max_size + end + + def too_deep? + @depth > @max_depth + end + + def add_object(object) + @size += ObjectSpace.memsize_of(object) + raise TooMuchDataError if @size > @max_size + + add_array(object) if object.is_a?(Array) + add_hash(object) if object.is_a?(Hash) + end + + def add_array(object) + with_nesting do + object.each do |n| + add_object(n) + end + end + end + + def add_hash(object) + with_nesting do + object.each do |key, value| + add_object(key) + add_object(value) + end + end + end + + def with_nesting + @depth += 1 + raise TooMuchDataError if too_deep? + + yield + + @depth -= 1 + end + end + end +end |