Class: Fluent::MysqlBinlogFlydataInput

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

Constant Summary collapse

SOURCE_POSITION_FILE_CLASS = 
Flydata::SourceMysql::PluginSupport::SourcePositionFile

Instance Method Summary collapse

Methods included from FlydataSync

#build_data_entry, included

Methods included from MysqlBinlogFlydataInputPreference

included

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 54

def configure(conf)
  super

  # SSL configuration
  unless @ssl_ca_content.to_s.strip.empty?
    @ssl_ca_path = @sync_fm.ssl_ca_path(@source_position_file.path)
    @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, ssl_cipher: @ssl_cipher }

  $log.info "mysql host:\"#{@host}\" port:\"#{@port}\" username:\"#{@username}\" database:\"#{@database}\" tables:\"#{@tables}\" tables_append_only:\"#{tables_append_only}\""
  $log.info "mysql client version: #{`mysql -V`}"
  server_msg = `echo 'select version();' | #{FlydataCore::Mysql::CommandGenerator.generate_mysql_cmd(@db_opts)} 2>&1`
  if ($? && $?.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

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

  # Set context
  @context = Flydata::SourceMysql::PluginSupport::Context.new(
    database: @database, tables: @tables,
    tag: @tag, sync_fm: @sync_fm, omit_events: @omit_events,
    table_meta: table_meta, table_revs: @table_revs, dbconf: @db_opts
  )
  @record_dispatcher = Flydata::SourceMysql::PluginSupport::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 = @source_position_file.read
  $log.error "error occurred while processing #{event.event_type} event at #{position}, event_class:#{event.class.to_s}\n#{e.message}\n#{$!.backtrace.join("\n")}"
  raise
end

#run ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 123

def run
  return if process_aborted?

  @context.table_meta.reload
  Flydata::SourceMysql::TableDdl.migrate_tables(@context.tables, @db_opts,
                                          @context.sync_fm, @source_position_file.path,
                                          @context) do |event|
    @record_dispatcher.dispatch(event)
  end

  current_ssl_cipher = @ssl_cipher
  retried = false

  do_transaction do |transaction_context|
    begin
      begin
        start_kodama(mysql_url) do |c|
          c.binlog_position_file = @source_position_file.path
          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
            unless current_ssl_cipher.to_s.empty?
              $log.info "SSL cipher is set. (ssl_cipher: #{current_ssl_cipher})"
              c.ssl_cipher = current_ssl_cipher
            end
          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 Kodama::TransactionError
        $log.debug "TransactionError"
        transaction_context.set_transaction_broken
        raise
      end
    rescue Binlog::Error => e
      if /dh key too small/.match(e.to_s) && !retried && !@secondary_ssl_cipher.to_s.empty?
        retried = true
        current_ssl_cipher = @secondary_ssl_cipher
        $log.warn("Retry with secondary ssl cipher list due to '#{e}' - secondary_ssl_cipher: '#{@secondary_ssl_cipher}'")
        retry
      elsif /binlog file.*does not exist/.match(e.to_s)
        $log.error("#{e.to_s}.  Sync must be reset.  Terminating the agent.")
        Process.kill(:TERM, Process.ppid)
      elsif e.kind_of?(Kodama::ConnectionEstablishError)
        $log.error("#{e.to_s}.  Connection to MySQL server could not be established.  Terminating the agent.")
        Process.kill(:TERM, Process.ppid)
      else
        raise e
      end
    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 215

def shutdown
  return if process_aborted?

  @idle_event_detector.stop
  if @thread and @thread.alive?
    $log.info "Requesting stop Kodama"
    begin
      @kodama_client.stop_request if @kodama_client
      if wait_till_safe_to_stop
        @thread.join
        $log.info "Kodama has stopped successfully"
      else
        $log.error "Unable to stop Kodama"
      end
    rescue => e
       $log.warn "an error occurred during Kodama shutdown.  error:'#{e.to_s}'\n#{e.backtrace.join("\n")}"
    end
  end

  @sync_fm.close
end

#start ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 90

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.warn "No binary log event since #{timestamp}. Restarting the process."
      Process.kill(:HUP, Process.ppid)
    end
  end

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 237

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