Class: Embulk::Filter::RubyProc

Inherits:
FilterPlugin
  • Object
show all
Defined in:
lib/embulk/filter/ruby_proc.rb

Defined Under Namespace

Classes: Evaluator

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.proc_store ⇒ Object 



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# File 'lib/embulk/filter/ruby_proc.rb', line 108

def self.proc_store
  @proc_store
end

.row_proc_store ⇒ Object 



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# File 'lib/embulk/filter/ruby_proc.rb', line 112

def self.row_proc_store
  @row_proc_store
end

.transaction(config, in_schema) {|task, out_columns| ... } ⇒ Object

Yields:

  • (task, out_columns) 


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# File 'lib/embulk/filter/ruby_proc.rb', line 32

def self.transaction(config, in_schema, &control)
  task = {
    "columns" => config.param("columns", :array, default: []),
    "rows" => config.param("rows", :array, default: []),
    "before" => config.param("before", :array, default: []),
    "after" => config.param("after", :array, default: []),
    "requires" => config.param("requires", :array, default: []),
    "variables" => config.param("variables", :hash, default: {}),
  }

  out_columns = in_schema.map do |col|
    target = task["columns"].find { |filter_col| filter_col["name"] == col.name }
    if target
      type = target["type"] ? target["type"].to_sym : col.type
      Embulk::Column.new(index: col.index, name: col.name, type: type || col.type, format: target["format"] || col.format)
    else
      col
    end
  end

  task["requires"].each do |lib|
    require lib
  end

  @proc_store ||= {}
  @row_proc_store ||= {}
  transaction_id = rand(100000000)
  until !@proc_store.has_key?(transaction_id)
    transaction_id = rand(100000000)
  end
  evaluator_binding = Evaluator.new(task["variables"]).get_binding

  # In order to avoid multithread probrem, initialize procs here
  before_procs = task["before"].map {|before|
    if before["proc"]
      eval(before["proc"], evaluator_binding)
    else
      eval(File.read(before["proc_file"]), evaluator_binding, File.expand_path(before["proc_file"]))
    end
  }
  @proc_store[transaction_id] = procs = Hash[task["columns"].map {|col|
    if col["proc"]
      [col["name"], eval(col["proc"], evaluator_binding)]
    else
      [col["name"], eval(File.read(col["proc_file"]), evaluator_binding, File.expand_path(col["proc_file"]))]
    end
  }]
  @row_proc_store[transaction_id] = row_procs = task["rows"].map {|rowdef|
    if rowdef["proc"]
      eval(rowdef["proc"], evaluator_binding)
    else
      eval(File.read(rowdef["proc_file"]), evaluator_binding, File.expand_path(rowdef["proc_file"]))
    end
  }.compact
  task["transaction_id"] = transaction_id
  raise "Need columns or rows parameter" if procs.empty? && row_procs.empty?

  before_procs.each do |pr|
    pr.call
  end

  yield(task, out_columns)

  after_procs = task["after"].map {|after|
    if after["proc"]
      eval(after["proc"], evaluator_binding)
    else
      eval(File.read(after["proc_file"]), evaluator_binding, File.expand_path(after["proc_file"]))
    end
  }

  after_procs.each do |pr|
    pr.call
  end
end

Instance Method Details

#add(page) ⇒ Object 



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# File 'lib/embulk/filter/ruby_proc.rb', line 127

def add(page)
  page.each do |record|
    if row_procs.empty?
      record_hashes = [hashrize(record)]
    else
      record_hashes = row_procs.each_with_object([]) do |pr, arr|
        result = pr.call(hashrize(record))
        case result
        when Array
          result.each do |r|
            arr << r
          end
        when Hash
          arr << result
        else
          raise "row proc return value must be a Array or Hash"
        end
      end
    end

    record_hashes.each do |record_hash|
      procs.each do |col, pr|
        next unless record_hash.has_key?(col)
        next if record_hash[col].nil? && skip_nils[col]

        if pr.arity == 1
          record_hash[col] = pr.call(record_hash[col])
        else
          record_hash[col] = pr.call(record_hash[col], record_hash)
        end
      end
      page_builder.add(record_hash.values)
    end
  end
end

#close ⇒ Object 



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# File 'lib/embulk/filter/ruby_proc.rb', line 124

def close
end

#finish ⇒ Object 



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# File 'lib/embulk/filter/ruby_proc.rb', line 163

def finish
  page_builder.finish
end

#init ⇒ Object 



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# File 'lib/embulk/filter/ruby_proc.rb', line 116

def init
  @procs = self.class.proc_store[task["transaction_id"]]
  @row_procs = self.class.row_proc_store[task["transaction_id"]]
  @skip_nils = Hash[task["columns"].map {|col|
    [col["name"], col["skip_nil"].nil? ? true : !!col["skip_nil"]]
  }]
end