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module JSON
#
# Output JSON from ruby objects in such a manner that all the hashes and arrays are output in alphanumeric sorted order.
# This is required so that our generated configs don't throw puppet or git for a tizzy fit.
#
# Beware: some hacky stuff ahead.
#
# This relies on the pure ruby implementation of JSON.generate (i.e. require 'json/pure')
# see https://github.com/flori/json/blob/master/lib/json/pure/generator.rb
#
# The Oj way that we are not using: Oj.dump(obj, :mode => :compat, :indent => 2)
#
def self.sorted_generate(obj)
# modify hash and array
Array.class_eval do
alias_method :each_without_sort, :each
def each(&block)
sorted = sort {|a,b| a.to_s <=> b.to_s }
for i in 0..(sorted.length-1) do
yield sorted[i]
end
end
end
Hash.class_eval do
alias_method :each_without_sort, :each
def each(&block)
self.keys.each do |key|
yield key, self.fetch(key) # fetch is used so we don't trigger Config::Object auto-eval
end
end
end
# generate json
json_str = JSON.pretty_generate(obj)
# restore hash and array
Hash.class_eval {alias_method :each, :each_without_sort}
Array.class_eval {alias_method :each, :each_without_sort}
return json_str
end
end
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