Class: Embulk::Input::Redis

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

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.transaction(config, &control) ⇒ Object 



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# File 'lib/embulk/input/rediskeys.rb', line 10

def self.transaction(config, &control)
  # configuration code:
  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 => ''),
    'match_key_as_key' => config.param('match_key_as_key', :bool, :default => true),
    'encode' => config.param('encode', :string, :default => 'json')
  }
  
  redis = ::Redis.new(:host => task['host'], :port => task['port'], :db => task['db'])
  keys = redis.keys("#{task['key_prefix']}*").inject([]){|col, k|
        col.push({'name' => k, 'type' => 'string'})
        col
      }
  puts "keys:#{keys}"

  task['columns'] = config.param('columns', :array, :default => keys).inject({}){|a, col|
        a[col['name']] = col['type'].to_sym
        a
      }

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

  #resume(task, columns, 1, &control)
  puts "Redis input started."
  task_reports = yield(task, columns, 1)
  puts "Redis input finished. Commit reports = #{task_reports.to_json}"
  
  return {}
end

Instance Method Details

#deserialize_element(name, x) ⇒ Object 



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# File 'lib/embulk/input/rediskeys.rb', line 70

def deserialize_element(name, x)
  begin
    type = nil
    @task['columns'].each do |key, value|
      if key == name
        type = value
        break
      end
    end
    val = x
    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

#expect_value_is_json ⇒ Object 



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# File 'lib/embulk/input/rediskeys.rb', line 127

def expect_value_is_json
  @redis.keys("#{@task['key_prefix']}*").each do |k|
    case @task['encode']
    when 'json'
	    @page_builder.add(JSON.parse(@redis.get(k)).each_with_object({}) {|(key, value), new_hash|
 new_hash[key] = deserialize_element(key, value)
	    }.values)
      @rows += 1
    when 'list'
      @redis.lrange(k, 0, -1).each do |r|
 @page_builder.add(JSON.parse(r).each_with_object({}) {|(key, value), new_hash|
		new_hash[key] = deserialize_element(key, value)
 }.values)
        @rows += 1
      end
    when 'hash'
	    @page_builder.add(JSON.parse(@redis.hgetall(k).to_json).each_with_object({}) {|(key, value), new_hash|
 new_hash[key] = deserialize_element(key, value)
	    }.values)
      @rows += 1
    end
  end
end

#init ⇒ Object

TODO def self.guess(config)

sample_records = [
  {"example"=>"a", "column"=>1, "value"=>0.1},
  {"example"=>"a", "column"=>2, "value"=>0.2},
]
columns = Guess::SchemaGuess.from_hash_records(sample_records)
return {"columns" => columns}

end



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# File 'lib/embulk/input/rediskeys.rb', line 62

def init
  # initialization code:
  puts "Redis input thread #{index}..."
  super
  @rows = 0
  @redis = ::Redis.new(:host => task['host'], :port => task['port'], :db => task['db'])
end

#match_key_as_key ⇒ Object 



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# File 'lib/embulk/input/rediskeys.rb', line 108

def match_key_as_key
  records = []
  @redis.keys("#{@task['key_prefix']}*").each do |k|
    case @task['encode']
    when 'json'
      v = @redis.get(k)
    when 'list'
      v = @redis.lrange(k, 0, -1)
    when 'hash'
      v = @redis.hgetall(k).to_json
    end
    v = "{\"#{k}\":#{v}}"
    x = JSON.parse(v)
    records.push(deserialize_element(k, x))
    @rows += 1
  end
  @page_builder.add(records)
end

#run ⇒ Object 



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# File 'lib/embulk/input/rediskeys.rb', line 151

def run
	if @task['match_key_as_key'] then
	  match_key_as_key()
	else
	  expect_value_is_json()
	end
  @page_builder.finish  # don't forget to call finish :-)

  task_report = {
    "rows" => @rows
  }
  return task_report
end