Class: RSMP::Proxy

Inherits:
Object
  • Object
show all
Includes:
Inspect, Logging, Notifier, Task
Defined in:
lib/rsmp/proxy.rb

Direct Known Subclasses

SiteProxy, SupervisorProxy

Constant Summary collapse

WRAPPING_DELIMITER = 
"\f"

Instance Attribute Summary collapse

Attributes included from Task

#task

Attributes included from Notifier

#listeners

Attributes included from Logging

#logger

Instance Method Summary collapse

Methods included from Task

#initialize_task, #restart, #run, #start, #stop, #task_status, #wait, #wait_for_condition

Methods included from Inspect

#inspector

Methods included from Notifier

#add_listener, #clear_deferred_notify, #deferred_notify, #dequeue_notify, #distribute_error, #initialize_distributor, #notify, #notify_without_defer, #remove_listener

Methods included from Logging

#initialize_logging

Constructor Details

#initialize(options) ⇒ Proxy

Returns a new instance of Proxy.



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# File 'lib/rsmp/proxy.rb', line 18

def initialize options
  @node = options[:node]
  initialize_logging options
  initialize_distributor
  initialize_task
  setup options
  clear
  @state = :disconnected
end

Instance Attribute Details

#archive ⇒ Object (readonly)

Returns the value of attribute archive.



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# File 'lib/rsmp/proxy.rb', line 16

def archive
  @archive
end

#collector ⇒ Object (readonly)

Returns the value of attribute collector.



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# File 'lib/rsmp/proxy.rb', line 16

def collector
  @collector
end

#connection_info ⇒ Object (readonly)

Returns the value of attribute connection_info.



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# File 'lib/rsmp/proxy.rb', line 16

def connection_info
  @connection_info
end

#ip ⇒ Object (readonly)

Returns the value of attribute ip.



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# File 'lib/rsmp/proxy.rb', line 16

def ip
  @ip
end

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/rsmp/proxy.rb', line 16

def node
  @node
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/rsmp/proxy.rb', line 16

def port
  @port
end

#state ⇒ Object (readonly)

Returns the value of attribute state.



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# File 'lib/rsmp/proxy.rb', line 16

def state
  @state
end

#sxl ⇒ Object (readonly)

Returns the value of attribute sxl.



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# File 'lib/rsmp/proxy.rb', line 16

def sxl
  @sxl
end

Instance Method Details

#acknowledge(original) ⇒ Object

Raises:

  • (InvalidArgument) 


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# File 'lib/rsmp/proxy.rb', line 480

def acknowledge original
  raise InvalidArgument unless original
  ack = MessageAck.build_from(original)
  ack.original = original.clone
  send_message ack, "for #{ack.original.type} #{original.m_id_short}"
  check_ingoing_acknowledged original
end

#acknowledged_first_ingoing(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 553

def acknowledged_first_ingoing message
end

#acknowledged_first_outgoing(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 550

def acknowledged_first_outgoing message
end

#author ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 623

def author
  @node.site_id
end

#buffer_message(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 344

def buffer_message message
  # TODO
  #log "Cannot send #{message.type} because the connection is closed.", message: message, level: :error
end

#check_ack_timeout(now) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 280

def check_ack_timeout now
  timeout = @site_settings['timeouts']['acknowledgement']
  # hash cannot be modify during iteration, so clone it
  @awaiting_acknowledgement.clone.each_pair do |m_id, message|
    latest = message.timestamp + timeout
    if now > latest
      str = "No acknowledgements for #{message.type} #{message.m_id_short} within #{timeout} seconds"
      log str, level: :error
      begin
        close
      ensure
        notify_error MissingAcknowledgment.new(str)
      end
    end
  end
end

#check_ingoing_acknowledged(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 543

def check_ingoing_acknowledged message
  unless @ingoing_acknowledged[message.type]
    @ingoing_acknowledged[message.type] = true
    acknowledged_first_ingoing message
  end
end

#check_outgoing_acknowledged(message) ⇒ Object

TODO this might be better handled by a proper event machine using e.g. the EventMachine gem



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# File 'lib/rsmp/proxy.rb', line 536

def check_outgoing_acknowledged message
  unless @outgoing_acknowledged[message.type]
    @outgoing_acknowledged[message.type] = true
    acknowledged_first_outgoing message
  end
end

#check_rsmp_version(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 466

def check_rsmp_version message
  versions = rsmp_versions
  # find versions that both we and the client support
  candidates = message.versions & versions
  if candidates.any?
    @rsmp_version = candidates.sort_by { |v| Gem::Version.new(v) }.last  # pick latest version
  else
    raise HandshakeError.new "RSMP versions [#{message.versions.join(',')}] requested, but only [#{versions.join(',')}] supported."
  end
end

#check_watchdog_timeout(now) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 297

def check_watchdog_timeout now
  timeout = @site_settings['timeouts']['watchdog']
  latest = @latest_watchdog_received + timeout
  left = latest - now
  if left < 0
    str = "No Watchdog within #{timeout} seconds"
    log str, level: :error
      begin
        close                                   # this will stop the current task (ourself)
      ensure
        notify_error MissingWatchdog.new(str)   # but ensure block will still be reached
      end
  end
end

#clear ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 139

def clear
  @awaiting_acknowledgement = {}
  @latest_watchdog_received = nil
  @watchdog_started = false
  @version_determined = false
  @ingoing_acknowledged = {}
  @outgoing_acknowledged = {}
  @latest_watchdog_send_at = nil

  @state_condition = Async::Notification.new
  @acknowledgements = {}
  @acknowledgement_condition = Async::Notification.new
end

#clock ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 123

def clock
  @node.clock
end

#close ⇒ Object

close connection, but keep our main task running so we can reconnect



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# File 'lib/rsmp/proxy.rb', line 38

def close
  log "Closing connection", level: :warning
  close_stream
  close_socket
  set_state :disconnected
  notify_error DisconnectError.new("Connection was closed")
  stop_timer
end

#close_socket ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 72

def close_socket
  return unless @socket
  @socket.close
  @socket = nil
end

#close_stream ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 66

def close_stream
  return unless @stream
  @stream.close
  @stream = nil
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rsmp/proxy.rb', line 131

def connected?
  @state == :connected || @state == :ready
end

#disconnect ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 28

def disconnect
end

#disconnected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rsmp/proxy.rb', line 135

def disconnected?
  @state == :disconnected
end

#dont_acknowledge(original, prefix = nil, reason = nil) ⇒ Object

Raises:

  • (InvalidArgument) 


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# File 'lib/rsmp/proxy.rb', line 488

def dont_acknowledge original, prefix=nil, reason=nil
  raise InvalidArgument unless original
  str = [prefix,reason].join(' ')
  log str, message: original, level: :warning if reason
  message = MessageNotAck.new({
    "oMId" => original.m_id,
    "rea" => reason || "Unknown reason"
  })
  message.original = original.clone
  send_message message, "for #{original.type} #{original.m_id_short}"
end

#dont_expect_acknowledgement(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 452

def dont_expect_acknowledgement message
  @awaiting_acknowledgement.delete message.attribute("oMId")
end

#expect_acknowledgement(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 446

def expect_acknowledgement message
  unless message.is_a?(MessageAck) || message.is_a?(MessageNotAck)
    @awaiting_acknowledgement[message.m_id] = message
  end
end

#expect_version_message(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 610

def expect_version_message message
  unless message.is_a?(Version) || message.is_a?(MessageAck) || message.is_a?(MessageNotAck)
    raise HandshakeError.new "Version must be received first"
  end
end

#extraneous_version(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 456

def extraneous_version message
  dont_acknowledge message, "Received", "extraneous Version message"
end

#find_original_for_message(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 531

def find_original_for_message message
   @awaiting_acknowledgement[ message.attribute("oMId") ]
end

#get_schemas ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 316

def get_schemas
  # normally we have an sxl, but during connection, it hasn't been established yet
  # at these times we only validate against the core schema
  # TODO
  # what schema should we use to validate the intial Version and MessageAck messages?
  schemas = { core: '3.1.5' }
  schemas[sxl] = RSMP::Schemer.sanitize_version(sxl_version) if sxl && sxl_version
  schemas
end

#handshake_complete ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 616

def handshake_complete
  set_state :ready
end

#inspect ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 117

def inspect
  "#<#{self.class.name}:#{self.object_id}, #{inspector(
    :@acknowledgements,:@settings,:@site_settings
    )}>"
end

#log(str, options = {}) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 312

def log str, options={}
  super str, options.merge(ip: @ip, port: @port, site_id: @site_id)
end

#log_acknowledgement_for_original(message, original) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 589

def log_acknowledgement_for_original message, original
  str = "Received #{message.type} for #{original.type} #{message.attribute("oMId")[0..3]}"
  if message.type == 'MessageNotAck'
    reason = message.attributes["rea"]
    str = "#{str}: #{reason}" if reason
    log str, message: message, level: :warning
  else
    log str, message: message, level: :log
  end
end

#log_acknowledgement_for_unknown(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 600

def log_acknowledgement_for_unknown message
  log "Received #{message.type} for unknown message #{message.attribute("oMId")[0..3]}", message: message, level: :warning
end

#log_send(message, reason = nil) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 349

def log_send message, reason=nil
  if reason
    str = "Sent #{message.type} #{reason}"
  else
    str = "Sent #{message.type}"
  end

  if message.type == "MessageNotAck"
    log str, message: message, level: :warning
  else
    log str, message: message, level: :log
  end
end

#notify_error(e, options = {}) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 206

def notify_error e, options={}
  @node.notify_error e, options
end

#process_ack(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 556

def process_ack message
  original = find_original_for_message message
  if original
    dont_expect_acknowledgement message
    message.original = original
    log_acknowledgement_for_original message, original

    if original.type == "Version"
      version_acknowledged
    end

    check_outgoing_acknowledged original

    @acknowledgements[ original.m_id ] = message
    @acknowledgement_condition.signal message
  else
    log_acknowledgement_for_unknown message
  end
end

#process_deferred ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 371

def process_deferred
  @node.process_deferred
end

#process_message(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 425

def process_message message
  case message
    when MessageAck
      process_ack message
    when MessageNotAck
      process_not_ack message
    when Version
      process_version message
    when Watchdog
      process_watchdog message
    else
      dont_acknowledge message, "Received", "unknown message (#{message.type})"
  end
end

#process_not_ack(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 576

def process_not_ack message
  original = find_original_for_message message
  if original
    dont_expect_acknowledgement message
    message.original = original
    log_acknowledgement_for_original message, original
    @acknowledgements[ original.m_id ] = message
    @acknowledgement_condition.signal message
  else
    log_acknowledgement_for_unknown message
  end
end

#process_packet(json) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 379

def process_packet json
  attributes = Message.parse_attributes json
  message = Message.build attributes, json
  message.validate(get_schemas) if should_validate_ingoing_message?(message)
  verify_sequence message
  deferred_notify do
    notify message
    process_message message
  end
  process_deferred
  message
rescue InvalidPacket => e
  str = "Received invalid package, must be valid JSON but got #{json.size} bytes: #{e.message}"
  notify_error e.exception(str)
  log str, level: :warning
  nil
rescue MalformedMessage => e
  str = "Received malformed message, #{e.message}"
  notify_error e.exception(str)
  log str, message: Malformed.new(attributes), level: :warning
  # cannot send NotAcknowledged for a malformed message since we can't read it, just ignore it
  nil
rescue SchemaError, RSMP::Schemer::Error => e
  reason = "schema errors: #{e.message}"
  str = "Received invalid #{message.type}, #{reason}"
  log str, message: message, level: :warning
  notify_error e.exception(str), message: message
  dont_acknowledge message, str, reason
  message
rescue InvalidMessage => e
  reason = "#{e.message}"
  str = "Received invalid #{message.type},"
  notify_error e.exception("#{str} #{message.json}"), message: message
  dont_acknowledge message, str, reason
  message
rescue FatalError => e
  reason = e.message
  str = "Rejected #{message.type},"
  notify_error e.exception(str), message: message
  dont_acknowledge message, str, reason
  close
  message
ensure
  @node.clear_deferred
end

#process_version(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 477

def process_version message
end

#process_watchdog(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 604

def process_watchdog message
  log "Received #{message.type}", message: message, level: :log
  @latest_watchdog_received = Clock.now
  acknowledge message
end

#read_line ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 184

def read_line
  json = @protocol.read_line
  beginning = Time.now
  message = process_packet json
  duration = Time.now - beginning
  ms = (duration*1000).round(4)
  if duration > 0
    per_second = (1.0 / duration).round
  else
    per_second = Float::INFINITY
  end
  if message
    type = message.type
    m_id = Logger.shorten_message_id(message.m_id)
  else
    type = 'Unknown'
    m_id = nil
  end
  str = [type,m_id,"processed in #{ms}ms, #{per_second}req/s"].compact.join(' ')
  log str, level: :statistics
end

#ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rsmp/proxy.rb', line 127

def ready?
  @state == :ready
end

#revive(options) ⇒ Object

revive after a reconnect



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# File 'lib/rsmp/proxy.rb', line 97

def revive options
  setup options
end

#rsmp_versions ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 460

def rsmp_versions
  return ['3.1.5'] if @site_settings["rsmp_versions"] == 'latest'
  return ['3.1.1','3.1.2','3.1.3','3.1.4','3.1.5'] if @site_settings["rsmp_versions"] == 'all'
  @site_settings["rsmp_versions"]
end

#run_reader ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 161

def run_reader
  @stream ||= Async::IO::Stream.new(@socket)
  @protocol ||= Async::IO::Protocol::Line.new(@stream,WRAPPING_DELIMITER) # rsmp messages are json terminated with a form-feed
  loop do
    read_line
  end
rescue Restart
  log "Closing connection", level: :warning
  raise
rescue Async::Wrapper::Cancelled
  # ignore exceptions raised when a wait is aborted because a task is stopped
rescue EOFError, Async::Stop
  log "Connection closed", level: :warning
rescue IOError => e
  log "IOError: #{e}", level: :warning
rescue Errno::ECONNRESET
  log "Connection reset by peer", level: :warning
rescue Errno::EPIPE
  log "Broken pipe", level: :warning
rescue StandardError => e
  notify_error e, level: :internal
end

#run_timer(task, interval) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 227

def run_timer task, interval
  next_time = Time.now.to_f
  loop do
    begin
      now = Clock.now
      timer(now)
    rescue RSMP::Schemer::Error => e
      log "Timer: Schema error: #{e}", level: :warning
    rescue EOFError => e
      log "Timer: Connection closed: #{e}", level: :warning
    rescue IOError => e
      log "Timer: IOError", level: :warning
    rescue Errno::ECONNRESET
      log "Timer: Connection reset by peer", level: :warning
    rescue Errno::EPIPE => e
      log "Timer: Broken pipe", level: :warning
    rescue StandardError => e
      notify_error e, level: :internal
    end
  ensure
    next_time += interval
    duration = next_time - Time.now.to_f
    task.sleep duration
  end
end

#send_and_optionally_collect(message, options, &block) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 627

def send_and_optionally_collect message, options, &block
  collect_options = options[:collect] || options[:collect!]
  if collect_options
    task = @task.async do |task|
      task.annotate 'send_and_optionally_collect'
      collector = yield collect_options     # call block to create collector
      collector.collect
      collector.ok! if options[:collect!]   # raise any errors if the bang version was specified
      collector
    end

    send_message message, validate: options[:validate]
    { sent: message, collector: task.wait }
  else
    send_message message, validate: options[:validate]
    return { sent: message }
  end
end

#send_message(message, reason = nil, validate: true) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 326

def send_message message, reason=nil, validate: true
  raise NotReady unless connected?
  raise IOError unless @protocol
  message.direction = :out
  message.generate_json
  message.validate get_schemas unless validate==false
  @protocol.write_lines message.json
  expect_acknowledgement message
  notify message
  log_send message, reason
rescue EOFError, IOError
  buffer_message message
rescue SchemaError, RSMP::Schemer::Error => e
  str = "Could not send #{message.type} because schema validation failed: #{e.message}"
  log str, message: message, level: :error
  notify_error e.exception("#{str} #{message.json}")
end

#send_version(site_id, rsmp_versions) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 511

def send_version site_id, rsmp_versions
  if rsmp_versions=='latest'
    versions = ['3.1.5']
  elsif rsmp_versions=='all'
    versions = ['3.1.1','3.1.2','3.1.3','3.1.4','3.1.5']
  else
    versions = [rsmp_versions].flatten
  end
  versions_array = versions.map {|v| {"vers" => v} }

  site_id_array = [site_id].flatten.map {|id| {"sId" => id} }

  version_response = Version.new({
    "RSMP"=>versions_array,
    "siteId"=>site_id_array,
    "SXL"=>sxl_version
  })
  send_message version_response
end

#send_watchdog(now = Clock.now) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 274

def send_watchdog now=Clock.now
  message = Watchdog.new( {"wTs" => clock.to_s})
  send_message message
  @latest_watchdog_send_at = now
end

#set_state(state) ⇒ Object

change our state



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# File 'lib/rsmp/proxy.rb', line 84

def set_state state
  return if state == @state
  @state = state
  state_changed
end

#setup(options) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 101

def setup options
  @settings = options[:settings]
  @socket = options[:socket]
  @stream = options[:stream]
  @protocol = options[:protocol]
  @ip = options[:ip]
  @port = options[:port]
  @connection_info = options[:info]
  @sxl = nil
  @site_settings = nil  # can't pick until we know the site id
  if options[:collect]
    @collector = RSMP::Collector.new self, options[:collect]
    @collector.start
  end
end

#should_validate_ingoing_message?(message) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rsmp/proxy.rb', line 363

def should_validate_ingoing_message? message
  return true unless @site_settings
  skip = @site_settings.dig('skip_validation')
  return true unless skip
  klass = message.class.name.split('::').last
  !skip.include?(klass)
end

#start_reader ⇒ Object

run an async task that reads from @socket



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# File 'lib/rsmp/proxy.rb', line 154

def start_reader
  @reader = @task.async do |task|
    task.annotate "reader"
    run_reader
  end
end

#start_timer ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 215

def start_timer
  return if @timer
  name = "timer"
  interval = @site_settings['intervals']['timer'] || 1
  log "Starting #{name} with interval #{interval} seconds", level: :debug
  @latest_watchdog_received = Clock.now
  @timer = @task.async do |task|
    task.annotate "timer"
    run_timer task, interval
  end
end

#start_watchdog ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 210

def start_watchdog
  log "Starting watchdog with interval #{@site_settings['intervals']['watchdog']} seconds", level: :debug
  @watchdog_started = true
end

#state_changed ⇒ Object

the state changed override to to things like notifications



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# File 'lib/rsmp/proxy.rb', line 92

def state_changed
  @state_condition.signal @state
end

#stop_reader ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 60

def stop_reader
  return unless @reader
  @reader.stop
  @reader = nil
end

#stop_subtasks ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 47

def stop_subtasks
  stop_timer
  stop_reader
  clear
  super
end

#stop_task ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 78

def stop_task
  close
  super
end

#stop_timer ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 54

def stop_timer
  return unless @timer
  @timer.stop
  @timer = nil
end

#timer(now) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 253

def timer now
  watchdog_send_timer now
  check_ack_timeout now
  check_watchdog_timeout now
end

#verify_sequence(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 375

def verify_sequence message
  expect_version_message(message) unless @version_determined
end

#version_acknowledged ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 620

def version_acknowledged
end

#wait_for_reader ⇒ Object

wait for the reader task to complete, which is not expected to happen before the connection is closed



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# File 'lib/rsmp/proxy.rb', line 33

def wait_for_reader
  @reader.wait if @reader
end

#wait_for_state(state, timeout:) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 500

def wait_for_state state, timeout:
  states = [state].flatten
  return if states.include?(@state)
  wait_for_condition(@state_condition,timeout: timeout) do
    states.include?(@state)
  end
  @state
rescue RSMP::TimeoutError
  raise RSMP::TimeoutError.new "Did not reach state #{state} within #{timeout}s"
end

#watchdog_send_timer(now) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 259

def watchdog_send_timer now
  return unless @watchdog_started
  return if @site_settings['intervals']['watchdog'] == :never
  if @latest_watchdog_send_at == nil
    send_watchdog now
  else
    # we add half the timer interval to pick the timer
    # event closes to the wanted wathcdog interval
    diff = now - @latest_watchdog_send_at
    if (diff + 0.5*@site_settings['intervals']['timer']) >= (@site_settings['intervals']['watchdog'])
      send_watchdog now
    end
  end
end

#will_not_handle(message) ⇒ Object 



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# File 'lib/rsmp/proxy.rb', line 440

def will_not_handle message
  reason = "since we're a #{self.class.name.downcase}" unless reason
  log "Ignoring #{message.type}, #{reason}", message: message, level: :warning
  dont_acknowledge message, nil, reason
end