The lower half of a Face. More...

#include <daemon/face/transport.hpp>

Inheritance diagram for nfd::face::Transport:

Collaboration diagram for nfd::face::Transport:

Public Types
using	Counters = TransportCounters
	Counters provided by a transport. More...

Public Member Functions
	Transport ()
	Default constructor. More...

virtual	~Transport ()

bool	canChangePersistencyTo (ndn::nfd::FacePersistency newPersistency) const
	Check whether the persistency can be changed to `newPersistency`. More...

void	close ()
	Request the transport to be closed. More...

virtual const Counters &	getCounters () const

time::steady_clock::time_point	getExpirationTime () const noexcept
	Returns the expiration time of the transport. More...

const Face *	getFace () const noexcept
	Returns the Face to which this transport is attached. More...

const LinkService *	getLinkService () const noexcept
	Returns the LinkService to which this transport is attached. More...

LinkService *	getLinkService () noexcept
	Returns the LinkService to which this transport is attached. More...

ndn::nfd::LinkType	getLinkType () const noexcept
	Returns the link type of the transport. More...

FaceUri	getLocalUri () const noexcept
	Returns a FaceUri representing the local endpoint. More...

ssize_t	getMtu () const noexcept
	Returns the maximum payload size. More...

ndn::nfd::FacePersistency	getPersistency () const noexcept
	Returns the current persistency setting of the transport. More...

FaceUri	getRemoteUri () const noexcept
	Returns a FaceUri representing the remote endpoint. More...

ndn::nfd::FaceScope	getScope () const noexcept
	Returns whether the transport is local or non-local for scope control purposes. More...

ssize_t	getSendQueueCapacity () const noexcept
	Returns the capacity of the send queue (in bytes). More...

virtual ssize_t	getSendQueueLength ()
	Returns the current send queue length of the transport (in octets). More...

TransportState	getState () const noexcept
	Returns the current transport state. More...

void	send (const Block &packet)
	Send a link-layer packet. More...

void	setFaceAndLinkService (Face &face, LinkService &service) noexcept
	Set Face and LinkService for this transport. More...

void	setPersistency (ndn::nfd::FacePersistency newPersistency)
	Changes the persistency setting of the transport. More...

Public Attributes
signal::Signal< Transport, TransportState, TransportState >	afterStateChange
	Signals when the transport state changes. More...

Protected Member Functions
virtual void	afterChangePersistency (ndn::nfd::FacePersistency oldPersistency)
	Invoked after the persistency has been changed. More...

virtual bool	canChangePersistencyToImpl (ndn::nfd::FacePersistency newPersistency) const
	Invoked by canChangePersistencyTo to perform the check. More...

virtual void	doClose ()=0
	Performs Transport specific operations to close the transport. More...

void	receive (const Block &packet, const EndpointId &endpoint={})
	Pass a received link-layer packet to the upper layer for further processing. More...

void	setExpirationTime (const time::steady_clock::time_point &expirationTime) noexcept

void	setLinkType (ndn::nfd::LinkType linkType) noexcept

void	setLocalUri (const FaceUri &uri) noexcept

void	setMtu (ssize_t mtu) noexcept

void	setRemoteUri (const FaceUri &uri) noexcept

void	setScope (ndn::nfd::FaceScope scope) noexcept

void	setSendQueueCapacity (ssize_t sendQueueCapacity) noexcept

void	setState (TransportState newState)
	Set transport state. More...

Protected Attributes
ByteCounter	nInBytes
	Total incoming bytes. More...

PacketCounter	nInPackets
	Count of incoming packets. More...

ByteCounter	nOutBytes
	Total outgoing bytes. More...

PacketCounter	nOutPackets
	Count of outgoing packets. More...

Detailed Description

The lower half of a Face.

See also: Face, LinkService

Definition at line 113 of file transport.hpp.

Member Typedef Documentation

◆ Counters

using nfd::face::Transport::Counters = TransportCounters

Counters provided by a transport.

See also: TransportCounters

Definition at line 119 of file transport.hpp.

Constructor & Destructor Documentation

◆ Transport()

nfd::face::Transport::Transport ( )

default

Default constructor.

This constructor initializes static properties to invalid values. Subclass constructor must explicitly set every static property.

This constructor initializes TransportState to UP; subclass constructor can rely on this default value.

◆ ~Transport()

nfd::face::Transport::~Transport ( )

virtualdefault

Member Function Documentation

◆ afterChangePersistency()

void nfd::face::Transport::afterChangePersistency ( ndn::nfd::FacePersistency oldPersistency )

protectedvirtual

Invoked after the persistency has been changed.

The base class implementation does nothing. When overridden in a subclass, the function should update internal states after persistency setting has been changed.

Reimplemented in nfd::face::UnicastUdpTransport, nfd::face::UnicastEthernetTransport, and nfd::face::TcpTransport.

Definition at line 170 of file transport.cpp.

◆ canChangePersistencyTo()

bool nfd::face::Transport::canChangePersistencyTo ( ndn::nfd::FacePersistency newPersistency ) const

Check whether the persistency can be changed to newPersistency.

This function serves as the external API, and invokes the protected function canChangePersistencyToImpl() to perform further checks if newPersistency differs from the current persistency.

Returns: true if the change can be performed, false otherwise

Definition at line 130 of file transport.cpp.

◆ canChangePersistencyToImpl()

bool nfd::face::Transport::canChangePersistencyToImpl ( ndn::nfd::FacePersistency newPersistency ) const

protectedvirtual

Invoked by canChangePersistencyTo to perform the check.

Base class implementation returns false.

Parameters

newPersistency the new persistency, guaranteed to be different from current persistency

Reimplemented in nfd::face::UnicastUdpTransport, nfd::face::UnicastEthernetTransport, and nfd::face::TcpTransport.

Definition at line 146 of file transport.cpp.

◆ close()

void nfd::face::Transport::close ( )

Request the transport to be closed.

This operation is effective only if transport is in UP or DOWN state, otherwise it has no effect. The transport changes state to CLOSING, and performs cleanup procedure. The state will be changed to CLOSED when cleanup is complete, which may happen synchronously or asynchronously.

Definition at line 67 of file transport.cpp.

◆ doClose()

virtual void nfd::face::Transport::doClose ( )

protectedpure virtual

Performs Transport specific operations to close the transport.

This is invoked once by close() after changing state to CLOSING. It will not be invoked by Transport class if the transport is already CLOSING or CLOSED.

When the cleanup procedure is complete, this method should change state to CLOSED. This transition can happen synchronously or asynchronously.

Implemented in nfd::face::StreamTransport< Protocol >, nfd::face::StreamTransport< boost::asio::ip::tcp >, nfd::face::StreamTransport< boost::asio::local::stream_protocol >, nfd::face::DatagramTransport< Protocol, Addressing >, nfd::face::DatagramTransport< boost::asio::ip::udp, Unicast >, nfd::face::DatagramTransport< boost::asio::ip::udp, Multicast >, nfd::face::WebSocketTransport, nfd::face::TcpTransport, nfd::face::NullTransport, nfd::face::InternalForwarderTransport, and nfd::face::EthernetTransport.

◆ getCounters()

virtual const Counters& nfd::face::Transport::getCounters ( ) const

inlinevirtual

Reimplemented in nfd::face::WebSocketTransport.

Definition at line 170 of file transport.hpp.

◆ getExpirationTime()

time::steady_clock::time_point nfd::face::Transport::getExpirationTime ( ) const

inlinenoexcept

Returns the expiration time of the transport.

Return values

time::steady_clock::time_point::max() The transport has an indefinite lifetime.

Definition at line 306 of file transport.hpp.

◆ getFace()

const Face* nfd::face::Transport::getFace ( ) const

inlinenoexcept

Returns the Face to which this transport is attached.

Definition at line 146 of file transport.hpp.

◆ getLinkService() [1/2]

const LinkService* nfd::face::Transport::getLinkService ( ) const

inlinenoexcept

Returns the LinkService to which this transport is attached.

Definition at line 155 of file transport.hpp.

◆ getLinkService() [2/2]

LinkService* nfd::face::Transport::getLinkService ( )

inlinenoexcept

Returns the LinkService to which this transport is attached.

Definition at line 164 of file transport.hpp.

◆ getLinkType()

ndn::nfd::LinkType nfd::face::Transport::getLinkType ( ) const

inlinenoexcept

Returns the link type of the transport.

Definition at line 254 of file transport.hpp.

◆ getLocalUri()

FaceUri nfd::face::Transport::getLocalUri ( ) const

inlinenoexcept

Returns a FaceUri representing the local endpoint.

Definition at line 200 of file transport.hpp.

◆ getMtu()

ssize_t nfd::face::Transport::getMtu ( ) const

inlinenoexcept

Returns the maximum payload size.

Return values

MTU_UNLIMITED The transport has no limit on payload size.

This size is the maximum packet size that can be sent or received through this transport.

For a datagram-based transport, this is typically the Maximum Transmission Unit (MTU), after the overhead of headers introduced by the transport has been accounted for. For a stream-based transport, this is typically unlimited (MTU_UNLIMITED).

Definition at line 270 of file transport.hpp.

◆ getPersistency()

ndn::nfd::FacePersistency nfd::face::Transport::getPersistency ( ) const

inlinenoexcept

Returns the current persistency setting of the transport.

Definition at line 227 of file transport.hpp.

◆ getRemoteUri()

FaceUri nfd::face::Transport::getRemoteUri ( ) const

inlinenoexcept

Returns a FaceUri representing the remote endpoint.

Definition at line 209 of file transport.hpp.

◆ getScope()

ndn::nfd::FaceScope nfd::face::Transport::getScope ( ) const

inlinenoexcept

Returns whether the transport is local or non-local for scope control purposes.

Definition at line 218 of file transport.hpp.

◆ getSendQueueCapacity()

ssize_t nfd::face::Transport::getSendQueueCapacity ( ) const

inlinenoexcept

Returns the capacity of the send queue (in bytes).

Return values

QUEUE_UNSUPPORTED	The transport does not support queue capacity retrieval.
QUEUE_ERROR	The transport was unable to retrieve the queue capacity.

Definition at line 281 of file transport.hpp.

◆ getSendQueueLength()

virtual ssize_t nfd::face::Transport::getSendQueueLength ( )

inlinevirtual

Returns the current send queue length of the transport (in octets).

Return values

QUEUE_UNSUPPORTED	The transport does not support queue length retrieval.
QUEUE_ERROR	The transport was unable to retrieve the queue length.

Reimplemented in nfd::face::StreamTransport< Protocol >, nfd::face::StreamTransport< boost::asio::ip::tcp >, nfd::face::StreamTransport< boost::asio::local::stream_protocol >, nfd::face::DatagramTransport< Protocol, Addressing >, nfd::face::DatagramTransport< boost::asio::ip::udp, Unicast >, nfd::face::DatagramTransport< boost::asio::ip::udp, Multicast >, nfd::face::TcpTransport, and nfd::face::MulticastUdpTransport.

Definition at line 317 of file transport.hpp.

◆ getState()

TransportState nfd::face::Transport::getState ( ) const

inlinenoexcept

Returns the current transport state.

Definition at line 291 of file transport.hpp.

◆ receive()

void nfd::face::Transport::receive	(	const Block &	packet,
		const EndpointId &	endpoint = `{}`
	)

protected

Pass a received link-layer packet to the upper layer for further processing.

Parameters

packet	The received packet, must be a valid and well-formed TLV block
endpoint	The source endpoint, optional for unicast transports

Warning: Behavior is undefined if packet size exceeds the MTU limit.

Definition at line 101 of file transport.cpp.

◆ send()

void nfd::face::Transport::send ( const Block & packet )

Send a link-layer packet.

Parameters

packet the packet to be sent, must be a valid and well-formed TLV block

Note: This operation has no effect if getState() is neither UP nor DOWN

Warning: Behavior is undefined if packet size exceeds the MTU limit

Definition at line 80 of file transport.cpp.

◆ setExpirationTime()

void nfd::face::Transport::setExpirationTime ( const time::steady_clock::time_point & expirationTime )

inlineprotectednoexcept

Definition at line 377 of file transport.hpp.

◆ setFaceAndLinkService()

void nfd::face::Transport::setFaceAndLinkService	(	Face &	face,
		LinkService &	service
	)

noexcept

Set Face and LinkService for this transport.

Precondition: setFaceAndLinkService() has not been called.

Definition at line 57 of file transport.cpp.

◆ setLinkType()

void nfd::face::Transport::setLinkType ( ndn::nfd::LinkType linkType )

inlineprotectednoexcept

Definition at line 352 of file transport.hpp.

◆ setLocalUri()

void nfd::face::Transport::setLocalUri ( const FaceUri & uri )

inlineprotectednoexcept

Definition at line 334 of file transport.hpp.

◆ setMtu()

void nfd::face::Transport::setMtu ( ssize_t mtu )

protectednoexcept

Definition at line 114 of file transport.cpp.

◆ setPersistency()

void nfd::face::Transport::setPersistency ( ndn::nfd::FacePersistency newPersistency )

Changes the persistency setting of the transport.

Definition at line 152 of file transport.cpp.

◆ setRemoteUri()

void nfd::face::Transport::setRemoteUri ( const FaceUri & uri )

inlineprotectednoexcept

Definition at line 340 of file transport.hpp.

◆ setScope()

void nfd::face::Transport::setScope ( ndn::nfd::FaceScope scope )

inlineprotectednoexcept

Definition at line 346 of file transport.hpp.

◆ setSendQueueCapacity()

void nfd::face::Transport::setSendQueueCapacity ( ssize_t sendQueueCapacity )

inlineprotectednoexcept

Definition at line 361 of file transport.hpp.

◆ setState()

void nfd::face::Transport::setState ( TransportState newState )

protected

Set transport state.

Only the following transitions are valid: UP->DOWN, DOWN->UP, UP/DOWN->CLOSING/FAILED, CLOSING/FAILED->CLOSED

Exceptions

std::runtime_error transition is invalid.

Definition at line 175 of file transport.cpp.

Member Data Documentation

◆ afterStateChange

signal::Signal<Transport, TransportState, TransportState> nfd::face::Transport::afterStateChange

Signals when the transport state changes.

Definition at line 299 of file transport.hpp.

◆ nInBytes

ByteCounter nfd::face::TransportCounters::nInBytes

inherited

Total incoming bytes.

This counter includes headers imposed by NFD (such as NDNLP), but excludes overhead of underlying protocol (such as IP header). For a datagram-based transport, an incoming packet that cannot be parsed as TLV would not be counted.

Definition at line 78 of file transport.hpp.

◆ nInPackets

PacketCounter nfd::face::TransportCounters::nInPackets

inherited

Count of incoming packets.

A 'packet' typically means a top-level TLV block. For a datagram-based transport, an incoming packet that cannot be parsed as TLV would not be counted.

Definition at line 62 of file transport.hpp.

◆ nOutBytes

ByteCounter nfd::face::TransportCounters::nOutBytes

inherited

Total outgoing bytes.

This counter includes headers imposed by NFD (such as NDNLP), but excludes overhead of underlying protocol (such as IP header). This counter is increased only if transport is UP.

Definition at line 86 of file transport.hpp.

◆ nOutPackets

PacketCounter nfd::face::TransportCounters::nOutPackets

inherited

Count of outgoing packets.

A 'packet' typically means a top-level TLV block. This counter is incremented only if transport is UP.

Definition at line 69 of file transport.hpp.

NFD: Named Data Networking Forwarding Daemon 22.12 documentation

Public Types

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Member Typedef Documentation

◆ Counters

Constructor & Destructor Documentation

◆ Transport()

◆ ~Transport()

Member Function Documentation

◆ afterChangePersistency()

◆ canChangePersistencyTo()

◆ canChangePersistencyToImpl()

◆ close()

◆ doClose()

◆ getCounters()

◆ getExpirationTime()

◆ getFace()

◆ getLinkService() [1/2]

◆ getLinkService() [2/2]

◆ getLinkType()

◆ getLocalUri()

◆ getMtu()

◆ getPersistency()

◆ getRemoteUri()

◆ getScope()

◆ getSendQueueCapacity()

◆ getSendQueueLength()

◆ getState()

◆ receive()

◆ send()

◆ setExpirationTime()

◆ setFaceAndLinkService()

◆ setLinkType()

◆ setLocalUri()

◆ setMtu()

◆ setPersistency()

◆ setRemoteUri()

◆ setScope()

◆ setSendQueueCapacity()

◆ setState()

Member Data Documentation

◆ afterStateChange

◆ nInBytes

◆ nInPackets

◆ nOutBytes

◆ nOutPackets