Class: FastJsonTruncator

Inherits:
Object
  • Object
show all
Defined in:
lib/end_point_blank/fast_json_truncator.rb

Constant Summary collapse

MAX_BYTES = 
10000
MAX_DEPTH = 
5
MAX_LIST = 
20
MAX_STRING = 
200
MAX_KEYS = 
20

Class Method Summary collapse

Class Method Details

.ensure_limit(json, limit) ⇒ Object 



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# File 'lib/end_point_blank/fast_json_truncator.rb', line 43

def self.ensure_limit(json, limit)
  return json if json.bytesize <= limit

  truncated = json.byteslice(0, limit - 20)
  truncated + '...,"truncated":true}'
end

.prune(value, depth) ⇒ Object 



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# File 'lib/end_point_blank/fast_json_truncator.rb', line 16

def self.prune(value, depth)
  return "[truncated]" if depth > MAX_DEPTH

  case value
  when Hash
    result = {}
    value.each_with_index do |(k, v), i|
      break if i >= MAX_KEYS
      result[k] = prune(v, depth + 1)
    end
    result

  when Array
    value.first(MAX_LIST).map { |v| prune(v, depth + 1) }

  when String
    if value.bytesize > MAX_STRING
      value.byteslice(0, MAX_STRING) + "..."
    else
      value
    end

  else
    value
  end
end

.truncate(data, limit = MAX_BYTES) ⇒ Object 



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# File 'lib/end_point_blank/fast_json_truncator.rb', line 10

def self.truncate(data, limit = MAX_BYTES)
  pruned = prune(data, 0)
  json = JSON.generate(pruned)
  ensure_limit(json, limit)
end