JezK
Edit File: json_serialization.rb
# frozen_string_literal: true require 'stringio' module Puma # Puma deliberately avoids the use of the json gem and instead performs JSON # serialization without any external dependencies. In a puma cluster, loading # any gem into the puma master process means that operators cannot use a # phased restart to upgrade their application if the new version of that # application uses a different version of that gem. The json gem in # particular is additionally problematic because it leverages native # extensions. If the puma master process relies on a gem with native # extensions and operators remove gems from disk related to old releases, # subsequent phased restarts can fail. # # The implementation of JSON serialization in this module is not designed to # be particularly full-featured or fast. It just has to handle the few places # where Puma relies on JSON serialization internally. module JSONSerialization QUOTE = /"/ BACKSLASH = /\\/ CONTROL_CHAR_TO_ESCAPE = /[\x00-\x1F]/ # As required by ECMA-404 CHAR_TO_ESCAPE = Regexp.union QUOTE, BACKSLASH, CONTROL_CHAR_TO_ESCAPE class SerializationError < StandardError; end class << self def generate(value) StringIO.open do |io| serialize_value io, value io.string end end private def serialize_value(output, value) case value when Hash output << '{' value.each_with_index do |(k, v), index| output << ',' if index != 0 serialize_object_key output, k output << ':' serialize_value output, v end output << '}' when Array output << '[' value.each_with_index do |member, index| output << ',' if index != 0 serialize_value output, member end output << ']' when Integer, Float output << value.to_s when String serialize_string output, value when true output << 'true' when false output << 'false' when nil output << 'null' else raise SerializationError, "Unexpected value of type #{value.class}" end end def serialize_string(output, value) output << '"' output << value.gsub(CHAR_TO_ESCAPE) do |character| case character when BACKSLASH '\\\\' when QUOTE '\\"' when CONTROL_CHAR_TO_ESCAPE '\u%.4X' % character.ord end end output << '"' end def serialize_object_key(output, value) case value when Symbol, String serialize_string output, value.to_s else raise SerializationError, "Could not serialize object of type #{value.class} as object key" end end end end end