Class: Fluent::NestedHashFilter::NestedObject

Inherits:
Object
  • Object
show all
Defined in:
lib/fluent/plugin/nested_hash_filter/nested_object.rb

Constant Summary collapse

DEFAULT_CONNECTOR = 
"."

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ NestedObject

Returns a new instance of NestedObject.



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 17

def initialize options = {}
  @output       = {}
  @output_keys  = []
  @connector    = options[:connector] || DEFAULT_CONNECTOR
  @jsonify_keys = init_jsonify_keys options[:jsonify_keys]
end

Instance Attribute Details

#connector ⇒ Object (readonly)

Returns the value of attribute connector.



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 15

def connector
  @connector
end

#jsonify_keys ⇒ Object

Returns the value of attribute jsonify_keys.



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 14

def jsonify_keys
  @jsonify_keys
end

#output ⇒ Object

Returns the value of attribute output.



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 14

def output
  @output
end

#output_keys ⇒ Object

Returns the value of attribute output_keys.



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 14

def output_keys
  @output_keys
end

Class Method Details

.convert(object, options = {}) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 8

def self.convert object, options = {}
  converter = new options
  converter.select object
  converter.output
end

Instance Method Details

#acts_as_json(value) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 47

def acts_as_json value
  json = JSON.parse value
  select json
rescue TypeError => error
  err = JSON::ParserError.new error.message
  err.set_backtrace err.backtrace
  raise err
rescue JSON::ParserError => error
  raise error
ensure
  jsonified!
end

#add_key(key) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 35

def add_key key
  @output_keys.push key
end

#convert_array(array) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 100

def convert_array array
  if array.empty?
    update nil
  end

  array.each_with_index do |value, index|
    add_key index
    select  value
    pop_key
  end
end

#convert_hash(hash) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 88

def convert_hash hash
  if hash.keys.empty?
    update nil
  end

  hash.each do |key, value|
    add_key key
    select  value
    pop_key
  end
end

#current_key ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 43

def current_key
  @output_keys.join connector
end

#init_jsonify_keys(keys) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 68

def init_jsonify_keys keys
  keys = keys || []
  values = [true] * keys.size
  zipped = keys.zip values
  Hash[ zipped ]
end

#jsonified! ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 64

def jsonified!
  @jsonify_keys[current_key] = false
end

#jsonify_key? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 60

def jsonify_key?
  !!@jsonify_keys[current_key]
end

#pop_key ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 39

def pop_key
  @output_keys.pop
end

#select(object) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 24

def select object
  case object
  when Hash
    convert_hash object
  when Array
    convert_array object
  else
    update object
  end
end

#update(value) ⇒ Object 



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# File 'lib/fluent/plugin/nested_hash_filter/nested_object.rb', line 75

def update value
  case
  when current_key.empty?
    return
  when jsonify_key?
    acts_as_json value
  else
    @output.update current_key => value
  end
rescue JSON::ParserError
  @output.update current_key => value
end