Class: Fluent::MysqlBinlogFlydataInput

Inherits:
MysqlBinlogInput
  • Object
show all
Includes:
MysqlBinlogFlydataInputPreference
Defined in:
lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb

Constant Summary

Constants included from MysqlBinlogFlydataInputPreference

Fluent::MysqlBinlogFlydataInputPreference::CUSTOM_CONFIG_PARAMS

Instance Method Summary collapse

Methods included from MysqlBinlogFlydataInputPreference

included

Constructor Details

#initialize ⇒ MysqlBinlogFlydataInput

Returns a new instance of MysqlBinlogFlydataInput.



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 47

def initialize
  super
  install_custom_signal_handler
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 61

def configure(conf)
  super
  @binlog_position_file = Mysql::BinLogPositionFile.new(@position_file)
  unless @binlog_position_file.exists?
    raise "No position file(#{@position_file}). Initial synchronization is required before starting."
  end

  @sync_fm = Flydata::SyncFileManager.new(nil) # Passing nil for data_entry as this class does not use methods which require data_entry
  @sent_position_file_path = @sync_fm.sent_binlog_path(@position_file)

  load_custom_conf

  # SSL configuration
  unless @ssl_ca_content.to_s.strip.empty?
    @ssl_ca_path = @sync_fm.ssl_ca_path(@position_file)
    @sync_fm.save_ssl_ca(FlydataCore::Fluent::ConfigHelper.unescape_conf(@ssl_ca_content), @ssl_ca_path)
  end

  # Db access opts
  @db_opts = { host: @host, port: @port, username: @username, password: @password, database: @database, ssl_ca: @ssl_ca_path }

  $log.info "mysql host:\"#{@host}\" port:\"#{@port}\" username:\"#{@username}\" database:\"#{@database}\" tables:\"#{@tables}\" tables_append_only:\"#{tables_append_only}\""
  $log.info "mysql client version: #{`mysql -V`}"
  server_msg = `echo 'select version();' | #{Flydata::Mysql::MysqlUtil.generate_mysql_cmd(@db_opts)} 2>&1`
  server_msg = server_msg.each_line.select{|l| l.start_with?('ERROR ')}.join("\n")
  if ($?.exitstatus == 0)
    $log.info "mysql server version: #{server_msg.strip}"
  else
    err_msg = "Failed to access mysql server... #{server_msg.strip}"
    $log.error err_msg
    $stderr.puts err_msg
    #exit 1   # causes retry loop
  end

  @tables = @tables.split(/,\s*/)
  @omit_events = Hash.new
  @tables_append_only.split(/,\s*/).each do |table|
    @tables << table unless @tables.include?(table)
    @omit_events[table] = [:delete, :truncate_table]
  end

  # Remove tables that do not have pos files
  new_tables = @sync_fm.get_new_table_list(@tables, "pos")
  @tables -= new_tables
  $log.info "Not watching these tables: #{new_tables.join(", ")}"

  table_meta = Flydata::Mysql::TableMeta.new(@db_opts.merge(tables: @tables))

  table_revs = tables.inject({}) do |h, table_name|
    h[table_name] = @sync_fm.table_rev(table_name)
    h
  end


  # Set context
  @context = Mysql::Context.new(
    database: @database, tables: @tables,
    tag: @tag, sync_fm: @sync_fm, omit_events: @omit_events,
    table_meta: table_meta, table_revs: table_revs,
  )
  @record_dispatcher = Mysql::FlydataBinlogRecordDispatcher.new(@context)
  @idle_event_detector = IdleEventDetector.new(@initial_idle_interval, @continuous_idle_interval, @check_interval, @idle_timeout)
end

#event_listener(event) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 206

def event_listener(event)
  @idle_event_detector.notify
  @record_dispatcher.dispatch(event)
rescue Exception => e
  position = @binlog_position_file.read
  $log.error "error occured while processing #{event.event_type} event at #{position}\n#{e.message}\n#{$!.backtrace.join("\n")}"
  # Not reraising a StandardError because the underlying code can't handle an error well.
  raise unless e.kind_of?(StandardError)
end

#install_custom_signal_handler ⇒ Object

Hack: All that has been added here is ‘Fluent::Engine.shutdown_source`. This should be in fluentd’s supervisor#install_main_process_signal_handlers



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 242

def install_custom_signal_handler
    trap :USR1 do
      $log.debug "fluentd main process get SIGUSR1"
      $log.info "force flushing buffered events"
      #@log.reopen!

      # Creating new thread due to mutex can't lock
      # in main thread during trap context
      Thread.new {
        begin
          Fluent::Engine.shutdown_source
          Fluent::Engine.flush!
          $log.debug "flushing thread: flushed"
        rescue Exception => e
          $log.warn "flushing thread error: #{e}"
        end
      }.run
    end
end

#run ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 159

def run
  @context.table_meta.update
  Flydata::Mysql::TableDdl.migrate_tables(@context.tables, @db_opts,
                                          @context.sync_fm, @position_file,
                                          @context) do |event|
    @record_dispatcher.dispatch(event)
  end
  start_kodama(mysql_url) do |c|
    c.binlog_position_file = @position_file
    if @ssl_ca_path.to_s != '' && c.respond_to?(:ssl_ca=)
      $log.info "SSL is enabled. (ssl_ca: #{@ssl_ca_path})"
      c.ssl_ca = @ssl_ca_path
    end

    if c.respond_to?(:sent_binlog_position_file=)
      $log.info "Sent position feature is enabled. sent_position_file:#{@sent_position_file_path}"
      c.sent_binlog_position_file = @sent_position_file_path
    end
    c.connection_retry_limit = @retry_limit
    c.connection_retry_wait = @retry_wait
    c.log_level = @log_level.to_sym
    @listen_events.each do |event_type|
      $log.trace { "registered binlog event listener '#{event_type}'" }
      c.send("on_#{event_type}", &method(:event_listener))
    end
  end
rescue => e
  # HACK: mysql-replication-listener has a network connection leak bug which doesn't release a connection
  # to MySQL.  Rather than fixing the bug, restarting the fluentd process for now.
  $log.warn "kodama died with an error.  Restart the process after #{@retry_wait} seconds.  error: #{e.class.to_s} '#{e.to_s}'\n#{e.backtrace.join("\n")}"
  sleep @retry_wait
  Process.kill(:HUP, Process.ppid) # Send SIGHUP to the supervisor to restart fluentd
rescue SignalException
  $log.debug "signal exception. exception: #{$!.class.to_s}, error: #{$!.to_s}"
  raise
rescue Exception
  $log.error "unexpected fatal error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  raise
end

#shutdown ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 216

def shutdown
  @idle_event_detector.stop
  if @thread and @thread.alive?
    $log.info "Requesting stop Kodama"
    @kodama_client.stop_request
    if wait_till_safe_to_stop
      $log.info "Killing Kodama client"
      Thread.kill(@thread)
    else
      $log.error "Unable to stop Kodama"
    end
  end
  @sync_fm.close
end

#start ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 125

def start
  super
  @idle_event_detector.start do |reason, timestamp|
    case reason
    when :event_not_coming
      $log.warn "No binary log event since #{timestamp}"
    when :event_still_not_coming
      $log.warn "No binary log event since #{timestamp}"
    when :event_arrived_finally
      $log.info "Binary log event has come at #{timestamp}"
    when :event_idle_timeout
      $log.error "No binary log event since #{timestamp}. Restart the process."
      Process.kill(:HUP, Process.ppid)
    end
  end

  positions_path = @context.sync_fm.table_positions_dir_path
  Dir.mkdir positions_path unless File.exists? positions_path
rescue Binlog::Error
  if (/basic_string::_M_replace_aux/ === $!.to_s)
    # TODO Fix the root cause in mysql-replication-listener
    $log.error <<EOS
a mysql-replication-listener error.  This could have been caused by one of the following reasons.
- Failed on connect: Your host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
EOS
  else
    $log.error "unexpected mysql-replication-listener error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  end
  raise
rescue Exception
  $log.error "unexpected fatal error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  raise
end

#start_kodama(options, &block) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 199

def start_kodama(options, &block)
  @kodama_client = Kodama::Client.new(Kodama::Client.mysql_url(options))
  @kodama_client.logger = $log
  block.call(@kodama_client)
  @kodama_client.start
end

#wait_till_safe_to_stop ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 231

def wait_till_safe_to_stop
  retry_count = 5
  1.upto(retry_count) do |i|
    return true if @kodama_client.safe_to_stop?
    sleep 3
  end
  false
end