Class: OverSIP::SIP::InviteServerTransaction

Inherits:
ServerTransaction show all
Defined in:
lib/oversip/sip/server_transaction.rb

Instance Attribute Summary

Attributes inherited from ServerTransaction

#core, #last_response, #request, #state

Instance Method Summary collapse

Methods inherited from ServerTransaction

#retransmit_last_response

Methods included from Logger

fg_system_msg2str, load_methods, #log_id

Constructor Details

#initialize(request) ⇒ InviteServerTransaction

Returns a new instance of InviteServerTransaction.



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# File 'lib/oversip/sip/server_transaction.rb', line 26

def initialize request
  super
  @request.connection.class.invite_server_transactions[@transaction_id] = self

  @log_id = "IST #{@transaction_id}"
  # Can be :proceeding, :completed, :confirmed, :accepted or :terminated.
  @state = :proceeding

  # NOTE: This is a timer of INVITE client transactions, but we also need it here to avoid
  # that an INVITE server transaction never ends.
  start_timer_C2

  @request.reply 100
end

Instance Method Details

#receive_ack ⇒ Object

This method is called by SipReactor#check_transaction upon receipt of an ACK matching an INVITE transaction (so it has been rejected with [3456]XX).



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# File 'lib/oversip/sip/server_transaction.rb', line 83

def receive_ack
  case @state
  when :proceeding
    log_system_debug "ACK received during proceeding state, ignoring it"  if $oversip_debug
  when :completed
    log_system_debug "ACK received during completed state, now confirmed"  if $oversip_debug
    @state = :confirmed
    @timer_G.cancel  if @timer_G
    @timer_H.cancel
    if @request.transport == :udp
      start_timer_I
    else
      terminate_transaction
    end
  else
    log_system_debug "ACK received during #{@state} state, ignoring it"  if $oversip_debug
  end
end

#receive_cancel(cancel) ⇒ Object

This method is called by SipReactor#check_transaction upon receipt of an CANCEL matching an INVITE transaction.



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# File 'lib/oversip/sip/server_transaction.rb', line 104

def receive_cancel cancel
  @core.receive_cancel(cancel)  if @core
end

#receive_response(status_code) ⇒ Object 



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# File 'lib/oversip/sip/server_transaction.rb', line 114

def receive_response status_code
  # Provisional response
  if status_code < 200
    case @state
    when :proceeding
      return true
    else
      log_system_notice "attempt to send a provisional response while in #{@state} state"
      return false
    end

  # 2XX final response.
  elsif status_code >= 200 and status_code < 300
    case @state
    when :proceeding
      @state = :accepted
      @timer_C2.cancel
      start_timer_L
      return true
    when :accepted
      return true
    else
      log_system_notice "attempt to send a final 2XX response while in #{@state} state"
      return false
    end

  # [3456]XX final response.
  else
    case @state
    when :proceeding
      @state = :completed
      @timer_C2.cancel
      start_timer_G if @request.transport == :udp
      start_timer_H
      return true
    else
      log_system_notice "attempt to send a final #{status_code} response while in #{@state} state"
      return false
    end
  end
end

#start_timer_C2 ⇒ Object

Timer to delete the transaction if final response is never sent by the TU.



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# File 'lib/oversip/sip/server_transaction.rb', line 74

def start_timer_C2
  @timer_C2 = ::EM::Timer.new(TIMER_C2) do
    log_system_debug "no final response within #{TIMER_C2} seconds, transaction terminated"  if $oversip_debug
    terminate_transaction
  end
end

#start_timer_G ⇒ Object 



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# File 'lib/oversip/sip/server_transaction.rb', line 41

def start_timer_G
  @timer_G_interval = TIMER_G
  @timer_G = ::EM::PeriodicTimer.new(@timer_G_interval) do
    log_system_debug "timer G expires, retransmitting last response"  if $oversip_debug
    retransmit_last_response
    @timer_G_interval = @timer_G.interval = [2*@timer_G_interval, T2].min
  end
end

#start_timer_H ⇒ Object 



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# File 'lib/oversip/sip/server_transaction.rb', line 50

def start_timer_H
  @timer_H = ::EM::Timer.new(TIMER_H) do
    log_system_debug "timer H expires and no ACK received, transaction terminated"  if $oversip_debug
    terminate_transaction
    @timer_G.cancel  if @timer_G
  end
end

#start_timer_I ⇒ Object 



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# File 'lib/oversip/sip/server_transaction.rb', line 58

def start_timer_I
  ::EM.add_timer(TIMER_I_UDP) do
    log_system_debug "timer I expires, transaction terminated"  if $oversip_debug
    terminate_transaction
  end
end

#start_timer_L ⇒ Object

RFC 6026.



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# File 'lib/oversip/sip/server_transaction.rb', line 66

def start_timer_L
  ::EM.add_timer(TIMER_L) do
    log_system_debug "timer L expires, transaction terminated"  if $oversip_debug
    terminate_transaction
  end
end

#terminate_transaction ⇒ Object

Terminate current transaction and delete from the list of transactions.



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# File 'lib/oversip/sip/server_transaction.rb', line 109

def terminate_transaction
  @state = :terminated
  @request.connection.class.invite_server_transactions.delete(@transaction_id)
end

#valid_response?(status_code) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/oversip/sip/server_transaction.rb', line 156

def valid_response? status_code
  # Provisional response
  if status_code < 200
    case @state
    when :proceeding
      return true
    else
      return false
    end

  # 2XX final response.
  elsif status_code >= 200 and status_code < 300
    case @state
    when :proceeding
      return true
    when :accepted
      return true
    else
      return false
    end

    # [3456]XX final response.
  else
    case @state
    when :proceeding
      return true
    else
      return false
    end
  end
end