Class: Embulk::InputRedis

Inherits:
InputPlugin
  • Object
show all
Defined in:
lib/embulk/input/redis.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.guess ⇒ Object 



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# File 'lib/embulk/input/redis.rb', line 9

def self.guess
end

.transaction(config, &control) ⇒ Object 



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# File 'lib/embulk/input/redis.rb', line 12

def self.transaction(config, &control)
  task = {
    'host' => config.param('host', :string, :default => 'localhost'),
    'port' => config.param('port', :integer, :default => 6379),
    'db' => config.param('db', :integer, :default => 0),
    'key_prefix' => config.param('key_prefix', :string, :default => ''),
    'encode' => config.param('encode', :string, :default => 'json'),
    'columns' =>
      config.param('columns', :array, :default => []).inject({}){|a, col|
        a[col['name']] = col['type'].to_sym
        a
      },
    'rows' => 0
  }

  columns = task['columns'].map.with_index{|(name, type), i|
    Column.new(i, name, type)
  }

  puts "Redis input started."
  commit_reports = yield(task, columns, 1)
  puts "Redis input finished. Commit reports = #{commit_reports.to_json}"

  return {}
end

Instance Method Details

#deserialize_element(x) ⇒ Object 



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# File 'lib/embulk/input/redis.rb', line 38

def deserialize_element(x)
  @task['columns'].map{|(name, type)|
    begin
      val = x[name]
      case type.to_sym  # Converted to String implicitly?
      when :boolean
        if val.is_a?(TrueClass) || val.is_a?(FalseClass)
          val
        else
          downcased_val = val.downcase
          case downcased_val
          when 'true' then true
          when 'false' then false
          else nil
          end
        end
      when :long
        Integer(val)
      when :double
        Float(val)
      when :string
        val
      when :timestamp
        Time.parse(val)
      else
        raise "Shouldn't reach here: val:#{val}, col_name:#{name}, col_type:#{type}"
      end
    rescue => e
      STDERR.puts "Failed to deserialize: val:#{val}, col_name:#{name}, col_type:#{type}, error:#{e.inspect}"
    end
  }
end

#run ⇒ Object 



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# File 'lib/embulk/input/redis.rb', line 71

def run
  puts "Redis input thread #{@index}..."
  r = Redis.new(:host => @task['host'], :port => @task['port'], :db => @task['db'])
  r.keys("#{@task['key_prefix']}*").each do |k|
    case @task['encode']
    when 'json'
      v = r.get(k)
      x = JSON.parse(v)
      @page_builder.add(deserialize_element(x))
    when 'hash'
      x = r.hgetall(k)
      @page_builder.add(deserialize_element(x))
    end
    @task['rows'] += 1
  end
  @page_builder.finish  # don't forget to call finish :-)

  commit_report = {
    "rows" => @task['rows']
  }
  return commit_report
end