Class: Fluent::Plugin::MysqlBulkOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_mysql_bulk.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MysqlBulkOutput

Returns a new instance of MysqlBulkOutput.



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 41

def initialize
  super
  require 'mysql2-cs-bind'
end

Instance Attribute Details

#handler ⇒ Object

Returns the value of attribute handler.



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

def handler
  @handler
end

Instance Method Details

#check_table_schema(database: @database, table: @table) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 92

def check_table_schema(database: @database, table: @table)
  result = client(database).xquery("SHOW COLUMNS FROM #{table}")
  max_lengths = []
  @column_names.each do |column|
    info = result.select { |x| x['Field'] == column }.first
    r = /(char|varchar)\(([\d]+)\)/
    begin
      max_length = info['Type'].scan(r)[0][1].to_i
    rescue
      max_length = nil
    end
    max_lengths << max_length
  end
  max_lengths
end

#client(database) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 121

def client(database)
  Mysql2::Client.new(
      host: @host,
      port: @port,
      username: @username,
      password: @password,
      database: database,
      flags: Mysql2::Client::MULTI_STATEMENTS
    )
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 46

def configure(conf)
  compat_parameters_convert(conf, :buffer, :inject)
  super

  if @column_names.nil?
    fail Fluent::ConfigError, 'column_names MUST specified, but missing'
  end

  if @on_duplicate_key_update
    if @on_duplicate_update_keys.nil?
      fail Fluent::ConfigError, 'on_duplicate_key_update = true , on_duplicate_update_keys nil!'
    end
    @on_duplicate_update_keys = @on_duplicate_update_keys.split(',')

    if !@on_duplicate_update_custom_values.nil?
      @on_duplicate_update_custom_values = @on_duplicate_update_custom_values.split(',')
      if @on_duplicate_update_custom_values.length != @on_duplicate_update_keys.length
        fail Fluent::ConfigError, "on_duplicate_update_keys and on_duplicate_update_custom_values must be the same length\n"
      end
    end

    @on_duplicate_key_update_sql = ' ON DUPLICATE KEY UPDATE '
    updates = []
    @on_duplicate_update_keys.each_with_index do |update_column, i|
      if @on_duplicate_update_custom_values.nil? || @on_duplicate_update_custom_values[i] == "#{update_column}"
        updates << "#{update_column} = VALUES(#{update_column})"
      else
        value = @on_duplicate_update_custom_values[i].to_s.match(/\${(.*)}/)[1]
        escape_value = Mysql2::Client.escape(value)
        updates << "#{update_column} = #{escape_value}"
      end
    end
    @on_duplicate_key_update_sql += updates.join(',')
  end

  @column_names = @column_names.split(',').collect(&:strip)
  @key_names = @key_names.nil? ? @column_names : @key_names.split(',').collect(&:strip)
  @json_key_names = @json_key_names.split(',') if @json_key_names
end

#expand_placeholders(metadata) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 132

def expand_placeholders(metadata)
  database = extract_placeholders(@database, metadata).gsub('.', '_')
  table = extract_placeholders(@table, metadata).gsub('.', '_')
  return database, table
end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 112

def format(tag, time, record)
  record = inject_values_to_record(tag, time, record)
  [tag, time, record].to_msgpack
end

#formatted_to_msgpack_binary ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 117

def formatted_to_msgpack_binary
  true
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 108

def shutdown
  super
end

#start ⇒ Object 



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

def start
  super
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_bulk.rb', line 138

def write(chunk)
  database, table = expand_placeholders(chunk.metadata)
  max_lengths = check_table_schema(database: database, table: table)
  @handler = client(database)
  values = []
  values_template = "(#{ @column_names.map { |key| '?' }.join(',') })"
  chunk.msgpack_each do |tag, time, data|
    data = format_proc.call(tag, time, data, max_lengths)
    values << Mysql2::Client.pseudo_bind(values_template, data)
  end
  sql = "INSERT INTO #{table} (#{@column_names.join(',')}) VALUES #{values.join(',')}"
  sql += @on_duplicate_key_update_sql if @on_duplicate_key_update

  log.info "bulk insert values size (table: #{table}) => #{values.size}"
  @handler.xquery(sql)
  @handler.close
end