Class: Fluent::SecureForwardOutput

Inherits:
ObjectBufferedOutput
  • Object
show all
Includes:
Mixin::ConfigPlaceholders
Defined in:
lib/fluent/plugin/out_secure_forward.rb,
lib/fluent/plugin/out_secure_forward.rb

Defined Under Namespace

Modules: OpenSSLUtil Classes: Node

Constant Summary collapse

DEFAULT_SECURE_CONNECT_PORT = 
24284
FORWARD_HEADER =

MessagePack FixArray length = 2

[0x92].pack('C')

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SecureForwardOutput

Returns a new instance of SecureForwardOutput.



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 53

def initialize
  super
  require 'socket'
  require 'openssl'
  require 'digest'
  require 'resolve/hostname'
end

Instance Attribute Details

#hostname_resolver ⇒ Object (readonly)

<server>

host ipaddr/hostname
hostlabel labelname # certification common name
port 24284
shared_key .... # optional shared key
username name # if required
password pass # if required

</server>



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

def hostname_resolver
  @hostname_resolver
end

#nodes ⇒ Object (readonly)

Returns the value of attribute nodes.



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

def nodes
  @nodes
end

#read_interval ⇒ Object (readonly)

Returns the value of attribute read_interval.



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

def read_interval
  @read_interval
end

#socket_interval ⇒ Object (readonly)

Returns the value of attribute socket_interval.



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

def socket_interval
  @socket_interval
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 66

def configure(conf)
  super

  unless @allow_self_signed_certificate
    raise Fluent::ConfigError, "not tested yet!"
  end

  @read_interval = @read_interval_msec / 1000.0
  @socket_interval = @socket_interval_msec / 1000.0

  # read <server> tags and set to nodes
  @nodes = []
  conf.elements.each do |element|
    case element.name
    when 'server'
      unless element['host']
        raise Fluent::ConfigError, "host missing in <server>"
      end
      node_shared_key = element['shared_key'] || @shared_key
      node = Node.new(self, node_shared_key, element)
      node.first_session = true
      node.keepalive = @keepalive
      @nodes.push node
    when 'secondary'
      # ignore
    else
      raise Fluent::ConfigError, "unknown config tag name #{element.name}"
    end
  end
  @next_node = 0
  @mutex = Mutex.new

  @hostname_resolver = Resolve::Hostname.new(:system_resolver => true)

  true
end

#node_watcher ⇒ Object 



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 135

def node_watcher
  reconnectings = Array.new(@nodes.size)
  nodes_size = @nodes.size

  loop do
    sleep @reconnect_interval

    log.trace "in node health watcher"

    (0...nodes_size).each do |i|
      log.trace "node health watcher for #{@nodes[i].host}"

      next if @nodes[i].established? && ! @nodes[i].expired?

      next if reconnectings[i]

      log.info "dead connection found: #{@nodes[i].host}, reconnecting..." unless @nodes[i].established?

      node = @nodes[i]
      log.debug "reconnecting to node", :host => node.host, :port => node.port, :expire => node.expire, :expired => node.expired?

      renewed = node.dup
      renewed.start

      Thread.pass # to connection thread
      reconnectings[i] = { :conn => renewed, :at => Time.now }
    end

    (0...nodes_size).each do |i|
      next unless reconnectings[i]

      log.trace "checking reconnecting node #{reconnectings[i][:conn].host}"

      if reconnectings[i][:conn].established?
        log.debug "connection established for reconnecting node"
        oldconn = @nodes[i]
        @nodes[i] = reconnectings[i][:conn]
        log.trace "old connection shutting down"
        oldconn.shutdown if oldconn # connection object doesn't raise any exceptions
        log.trace "old connection shutted down"

        reconnectings[i] = nil
        next
      end

      # not connected yet

      next if reconnectings[i][:at] + @established_timeout > Time.now

      # not connected yet, and timeout
      timeout_conn = reconnectings[i][:conn]
      log.debug "SSL connection is not established until timemout", :host => timeout_conn.host, :port => timeout_conn.port, :timeout => @established_timeout
      reconnectings[i] = nil
      timeout_conn.shutdown if timeout_conn # connection object doesn't raise any exceptions
    end
  end
end

#select_node(permit_standby = false) ⇒ Object 



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 103

def select_node(permit_standby=false)
  tries = 0
  nodes = @nodes.size
  @mutex.synchronize {
    n = nil
    while tries <= nodes
      n = @nodes[@next_node]
      @next_node += 1
      @next_node = 0 if @next_node >= nodes

      return n if n && n.established? && (!n.standby || permit_standby)

      tries += 1
    end
    nil
  }
end

#send_data(node, tag, es) ⇒ Object

to forward messages



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 230

def send_data(node, tag, es)
  ssl = node.sslsession
  # beginArray(2)
  ssl.write FORWARD_HEADER

  # writeRaw(tag)
  ssl.write tag.to_msgpack

  # beginRaw(size)
  sz = es.size
  #  # FixRaw
  #  ssl.write [0xa0 | sz].pack('C')
  #elsif sz < 65536
  #  # raw 16
  #  ssl.write [0xda, sz].pack('Cn')
  #else
  # raw 32
  ssl.write [0xdb, sz].pack('CN')
  #end

  # writeRawBody(packed_es)
  es.write_to(ssl)
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 193

def shutdown
  super

  @nodewatcher.kill
  @nodewatcher.join

  @nodes.each do |node|
    node.detach = true
    node.join
  end
end

#start ⇒ Object 



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

def start
  super

  log.debug "starting secure-forward"
  OpenSSL::Random.seed(File.read("/dev/urandom", 16))
  log.debug "start to connect target nodes"
  @nodes.each do |node|
    log.debug "connecting node", :host => node.host, :port => node.port
    node.start
  end
  @nodewatcher = Thread.new(&method(:node_watcher))
  @nodewatcher.abort_on_exception = true
end

#write_objects(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/out_secure_forward.rb', line 205

def write_objects(tag, es)
  node = select_node || select_node(true)
  unless node
    raise "no one nodes with valid ssl session"
  end
  log.trace "selected node", :host => node.host, :port => node.port, :standby => node.standby

  begin
    send_data(node, tag, es)
  rescue Errno::EPIPE, IOError, OpenSSL::SSL::SSLError => e
    log.warn "Failed to send messages to #{node.host}, parging.", :error_class => e.class, :error => e
    begin
      node.shutdown
    rescue => e2
      # ignore all errors
    end

    raise # to retry #write_objects
  end
end