Class: Fluent::MysqlPreparedStatementOutput

Inherits:
BufferedOutput
  • Object
show all
Defined in:
lib/fluent/plugin/out_mysql_prepared_statement.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MysqlPreparedStatementOutput

Returns a new instance of MysqlPreparedStatementOutput.



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 23

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_prepared_statement.rb', line 21

def handler
  @handler
end

Instance Method Details

#client ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 63

def client
  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_prepared_statement.rb', line 28

def configure(conf)
  super

  if @sql.nil?
    raise Fluent::ConfigError, "sql MUST be specified, but missing"
  end

  if @key_names.nil?
    raise Fluent::ConfigError, "key_names MUST be specified, but missing"
  end

  @key_names = @key_names.split(',')
  @format_proc = Proc.new{|tag, time, record| @key_names.map{|k| record[k]}}

  begin
    Mysql2::Client.pseudo_bind(@sql, @key_names.map{|n| nil})
  rescue ArgumentError => e
    raise Fluent::ConfigError, "mismatch between sql placeholders and key_names"
  end

  $log.info "sql ->[#{@sql}]"
end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 59

def format(tag, time, record)
  [tag, time, @format_proc.call(tag, time, record)].to_msgpack
end

#get_exec_result(data) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 86

def get_exec_result(data)
  results = Array.new
  stmt = @handler.xquery(@sql, data)
  return results if stmt.nil?
  stmt.each do |row|
    results.push(row)
  end
  return results
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 55

def shutdown
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 51

def start
  super
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_mysql_prepared_statement.rb', line 74

def write(chunk)
  @handler = client
  $log.info "adding mysql_query job: "
  chunk.msgpack_each { |tag, time, data|
    results = get_exec_result(data)
    results.each{|result|
      router.emit(@output_tag, Fluent::Engine.now, result)
    }
  }
  @handler.close
end