Class: Fluent::SQLInput::TableElement

Inherits:
Object
  • Object
show all
Includes:
Configurable
Defined in:
lib/fluent/plugin/in_sql.rb

Instance Method Summary collapse

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_sql.rb', line 50

def configure(conf)
  super
end

#emit_next_records(last_record, limit) ⇒ Object

emits next records and returns the last record of emitted records



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# File 'lib/fluent/plugin/in_sql.rb', line 94

def emit_next_records(last_record, limit)
  relation = @model
  if last_record && last_update_value = last_record[@update_column]
    relation = relation.where("#{@update_column} > ?", last_update_value)
  end
  relation = relation.order("#{@update_column} ASC").limit(limit)

  now = Engine.now
  entry_name = @model.table_name.singularize

  me = MultiEventStream.new
  relation.each do |obj|
    record = obj.serializable_hash rescue nil
    if record
      if @time_column && tv = obj.read_attribute(@time_column)
        if tv.is_a?(Time)
          time = tv.to_i
        else
          time = Time.parse(tv.to_s).to_i rescue now
        end
      else
        time = now
      end
      me.add(time, record)
      last_record = record
    end
  end

  last_record = last_record.dup  # some plugin rewrites record :(
  Engine.emit_stream(@tag, me)

  return last_record
end

#init(tag_prefix, base_model) ⇒ Object 



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# File 'lib/fluent/plugin/in_sql.rb', line 54

def init(tag_prefix, base_model)
  @tag = "#{tag_prefix}.#{@tag}" if tag_prefix

  # creates a model for this table
  table_name = @table
  @model = Class.new(base_model) do
    self.table_name = table_name
    self.inheritance_column = '_never_use_'
    #self.include_root_in_json = false

    def read_attribute_for_serialization(n)
      v = send(n)
      if v.respond_to?(:to_msgpack)
        v
      else
        v.to_s
      end
    end
  end

  # ActiveRecord requires model class to have a name.
  class_name = table_name.singularize.camelize
  base_model.const_set(class_name, @model)

  # Sets model_name otherwise ActiveRecord causes errors
  model_name = ActiveModel::Name.new(@model, nil, class_name)
  @model.define_singleton_method(:model_name) { model_name }

  # if update_column is not set, here uses primary key
  unless @update_column
    columns = Hash[@model.columns.map {|c| [c.name, c] }]
    pk = columns[@model.primary_key]
    unless pk
      raise "Composite primary key is not supported. Set update_column parameter to <table> section."
    end
    @update_column = pk.name
  end
end