Class: Fluent::MysqlBinlogFlydataInput

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

Constant Summary collapse

NON_DH_SSL_CIPHER =

Secondary ssl cipher is for a workaround to handle ‘dh key too small’ error If mysql-server is v5.6.25 or older, and client openssl is 1.0.1f-1ubuntu-2.15(for ubuntu) or later, client will get the above error because. the key length returned from mysql-server is only 512 bits.

In case of dh key error, we retry with non-DH cipher.

  • SECURITY IMPROVEMENT: reject dh keys smaller than 768 bits

launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.15

Supported ssl cipher list for mysql(openssl) dev.mysql.com/doc/refman/5.6/en/ssl-options.html

"AES256-GCM-SHA384:AES256-SHA:AES256-SHA256:CAMELLIA256-SHA:DES-CBC3-SHA:PSK-3DES-EDE-CBC-SHA:PSK-AES256-CBC-SHA:SRP-DSS-3DES-EDE-CBC-SHA:SRP-DSS-AES-128-CBC-SHA:SRP-DSS-AES-256-CBC-SHA:SRP-RSA-3DES-EDE-CBC-SHA:SRP-RSA-AES-128-CBC-S:SRP-RSA-AES-256-CBC-SHA"

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 78

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, 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

  @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)
  @lock_file = Flydata::FLYDATA_LOCK
end

#event_listener(event) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 256

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 299

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 184

def run
  return if instance_variable_defined? :@abort

  @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

  current_ssl_cipher = @ssl_cipher
  retried = false
  begin
    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
        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

      $log.info("Binlog position - resume_pos:'#{IO.read(@position_file) rescue IOError}' " +
                                  "sent_pos:'#{IO.read(@sent_position_file_path) rescue IOError}'")

      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 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
    else
      raise e
    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 266

def shutdown
  return if instance_variable_defined? :@abort

  if File.exists?(@lock_file) &&
     Process.pid == File.open(@lock_file, "r") {|f| f.read}.to_i
    File.delete(@lock_file)
  end

  @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 141

def start
  if File.exists?(@lock_file)
    $log.error "Previous process was terminated abnormally.  To start, remove the lock file after checking data integrity."
    @abort = true
    Process.kill(:TERM, Process.ppid)
    return
  end

  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

  File.open(@lock_file, "w") {|f| f.write(Process.pid)}
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 249

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 288

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