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-rw-r--r--lib/core_ext/json.rb39
1 files changed, 39 insertions, 0 deletions
diff --git a/lib/core_ext/json.rb b/lib/core_ext/json.rb
new file mode 100644
index 0000000..3b08a04
--- /dev/null
+++ b/lib/core_ext/json.rb
@@ -0,0 +1,39 @@
+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
+ Hash.class_eval do
+ alias_method :each_without_sort, :each
+ def each(&block)
+ keys.sort {|a,b| a.to_s <=> b.to_s }.each do |key|
+ yield key, self[key]
+ end
+ end
+ end
+ Array.class_eval do
+ alias_method :each_without_sort, :each
+ def each(&block)
+ sort {|a,b| a.to_s <=> b.to_s }.each_without_sort &block
+ 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