nfd::face::DatagramTransport< Protocol, Addressing > Class Template Reference

Implements Transport for datagram-based protocols. More...

#include <daemon/face/datagram-transport.hpp>

+ Inheritance diagram for nfd::face::DatagramTransport< Protocol, Addressing >:
+ Collaboration diagram for nfd::face::DatagramTransport< Protocol, Addressing >:

Public Types

typedef TransportCounters Counters
 counters provided by Transport More...
 
typedef uint64_t EndpointId
 identifies an endpoint on the link More...
 
typedef Protocol protocol
 

Public Member Functions

 DatagramTransport (typename protocol::socket &&socket)
 Construct datagram transport. More...
 
bool canChangePersistencyTo (ndn::nfd::FacePersistency newPersistency) const
 check whether the face persistency can be changed to newPersistency More...
 
void close ()
 request the transport to be closed More...
 
virtual const CountersgetCounters () const
 
time::steady_clock::TimePoint getExpirationTime () const
 
const FacegetFace () const
 
const LinkServicegetLinkService () const
 
LinkServicegetLinkService ()
 
ndn::nfd::LinkType getLinkType () const
 
FaceUri getLocalUri () const
 
ssize_t getMtu () const
 
ndn::nfd::FacePersistency getPersistency () const
 
FaceUri getRemoteUri () const
 
ndn::nfd::FaceScope getScope () const
 
ssize_t getSendQueueCapacity () const
 
ssize_t getSendQueueLength () override
 
TransportState getState () const
 
void receiveDatagram (const uint8_t *buffer, size_t nBytesReceived, const boost::system::error_code &error)
 Receive datagram, translate buffer into packet, deliver to parent class. More...
 
void send (Packet &&packet)
 send a link-layer packet More...
 
void setFaceAndLinkService (Face &face, LinkService &service)
 set Face and LinkService for Transport More...
 
void setPersistency (ndn::nfd::FacePersistency newPersistency)
 changes face persistency setting More...
 

Public Attributes

signal::Signal< Transport, TransportState, TransportStateafterStateChange
 signals when transport state changes More...
 

Static Public Attributes

static constexpr ssize_t MIN_MTU = 64
 minimum MTU that may be set on a transport 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...
 
void doClose () override
 performs Transport specific operations to close the transport More...
 
void doSend (Transport::Packet &&packet) override
 performs Transport specific operations to send a packet More...
 
void handleReceive (const boost::system::error_code &error, size_t nBytesReceived)
 
void handleSend (const boost::system::error_code &error, size_t nBytesSent)
 
bool hasRecentlyReceived () const
 
template<>
Transport::EndpointId makeEndpointId (const protocol::endpoint &ep)
 
template<>
Transport::EndpointId makeEndpointId (const protocol::endpoint &ep)
 
void processErrorCode (const boost::system::error_code &error)
 
void receive (Packet &&packet)
 receive a link-layer packet More...
 
void resetRecentlyReceived ()
 
void setExpirationTime (const time::steady_clock::TimePoint &expirationTime)
 
void setLinkType (ndn::nfd::LinkType linkType)
 
void setLocalUri (const FaceUri &uri)
 
void setMtu (ssize_t mtu)
 
void setRemoteUri (const FaceUri &uri)
 
void setScope (ndn::nfd::FaceScope scope)
 
void setSendQueueCapacity (ssize_t sendQueueCapacity)
 
void setState (TransportState newState)
 set transport state More...
 

Static Protected Member Functions

static EndpointId makeEndpointId (const typename protocol::endpoint &ep)
 

Protected Attributes

protocol::endpoint m_sender
 
protocol::socket m_socket
 
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

template<class Protocol, class Addressing = Unicast>
class nfd::face::DatagramTransport< Protocol, Addressing >

Implements Transport for datagram-based protocols.

Template Parameters
Protocola datagram-based protocol in Boost.Asio

Definition at line 46 of file datagram-transport.hpp.

Member Typedef Documentation

counters provided by Transport

Definition at line 146 of file transport.hpp.

typedef uint64_t nfd::face::Transport::EndpointId
inherited

identifies an endpoint on the link

Definition at line 118 of file transport.hpp.

template<class Protocol, class Addressing = Unicast>
typedef Protocol nfd::face::DatagramTransport< Protocol, Addressing >::protocol

Definition at line 49 of file datagram-transport.hpp.

Constructor & Destructor Documentation

template<class Protocol, class Addressing = Unicast>
nfd::face::DatagramTransport< T, U >::DatagramTransport ( typename protocol::socket &&  socket)
explicit

Construct datagram transport.

Parameters
socketProtocol-specific socket for the created transport

Definition at line 105 of file datagram-transport.hpp.

Member Function Documentation

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

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

Definition at line 172 of file transport.cpp.

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

check whether the face 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 132 of file transport.cpp.

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

invoked by canChangePersistencyTo to perform the check

Base class implementation returns false.

Parameters
newPersistencythe new persistency, guaranteed to be different from current persistency

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

Definition at line 148 of file transport.cpp.

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

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 87 of file transport.cpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::doClose ( )
overrideprotectedvirtual

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.

Implements nfd::face::Transport.

Definition at line 139 of file datagram-transport.hpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::doSend ( Transport::Packet &&  packet)
overrideprotectedvirtual

performs Transport specific operations to send a packet

Parameters
packetthe packet, which must be a well-formed TLV block
Precondition
state is either UP or DOWN

Implements nfd::face::Transport.

Definition at line 160 of file datagram-transport.hpp.

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

Reimplemented in nfd::face::WebSocketTransport.

Definition at line 409 of file transport.hpp.

time::steady_clock::TimePoint nfd::face::Transport::getExpirationTime ( ) const
inlineinherited
Returns
expiration time of the transport
Return values
time::steady_clock::TimePoint::max()the transport has indefinite lifetime

Definition at line 500 of file transport.hpp.

const Face * nfd::face::Transport::getFace ( ) const
inlineinherited
Returns
Face to which this Transport is attached

Definition at line 391 of file transport.hpp.

const LinkService * nfd::face::Transport::getLinkService ( ) const
inlineinherited
Returns
LinkService to which this Transport is attached

Definition at line 397 of file transport.hpp.

LinkService * nfd::face::Transport::getLinkService ( )
inlineinherited
Returns
LinkService to which this Transport is attached

Definition at line 403 of file transport.hpp.

ndn::nfd::LinkType nfd::face::Transport::getLinkType ( ) const
inlineinherited
Returns
whether face is point-to-point or multi-access

Definition at line 457 of file transport.hpp.

FaceUri nfd::face::Transport::getLocalUri ( ) const
inlineinherited
Returns
a FaceUri representing local endpoint

Definition at line 415 of file transport.hpp.

ssize_t nfd::face::Transport::getMtu ( ) const
inlineinherited
Returns
maximum payload size
Return values
MTU_UNLIMITEDtransport 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 469 of file transport.hpp.

ndn::nfd::FacePersistency nfd::face::Transport::getPersistency ( ) const
inlineinherited
Returns
face persistency setting

Definition at line 451 of file transport.hpp.

FaceUri nfd::face::Transport::getRemoteUri ( ) const
inlineinherited
Returns
a FaceUri representing remote endpoint

Definition at line 427 of file transport.hpp.

ndn::nfd::FaceScope nfd::face::Transport::getScope ( ) const
inlineinherited
Returns
whether face is local or non-local for scope control purpose

Definition at line 439 of file transport.hpp.

ssize_t nfd::face::Transport::getSendQueueCapacity ( ) const
inlineinherited
Returns
capacity of the send queue (in bytes)
Return values
QUEUE_UNSUPPORTEDtransport does not support queue capacity retrieval
QUEUE_ERRORtransport was unable to retrieve the queue capacity

Definition at line 482 of file transport.hpp.

template<class T , class U >
ssize_t nfd::face::DatagramTransport< T, U >::getSendQueueLength ( )
overridevirtual
Returns
current send queue length of the transport (in octets)
Return values
QUEUE_UNSUPPORTEDtransport does not support queue length retrieval
QUEUE_ERRORtransport was unable to retrieve the queue length

Reimplemented from nfd::face::Transport.

Definition at line 128 of file datagram-transport.hpp.

TransportState nfd::face::Transport::getState ( ) const
inlineinherited
Returns
transport state

Definition at line 494 of file transport.hpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::handleReceive ( const boost::system::error_code &  error,
size_t  nBytesReceived 
)
protected

Definition at line 203 of file datagram-transport.hpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::handleSend ( const boost::system::error_code &  error,
size_t  nBytesSent 
)
protected

Definition at line 216 of file datagram-transport.hpp.

template<class T , class U >
bool nfd::face::DatagramTransport< T, U >::hasRecentlyReceived ( ) const
protected

Definition at line 250 of file datagram-transport.hpp.

template<>
Transport::EndpointId nfd::face::DatagramTransport< boost::asio::ip::udp, Multicast >::makeEndpointId ( const protocol::endpoint &  ep)
protected
template<class T , class U >
Transport::EndpointId nfd::face::DatagramTransport< T, U >::makeEndpointId ( const typename protocol::endpoint &  ep)
staticprotected

Definition at line 264 of file datagram-transport.hpp.

template<>
Transport::EndpointId nfd::face::DatagramTransport< boost::asio::ip::udp, Multicast >::makeEndpointId ( const protocol::endpoint &  ep)
protected

Definition at line 196 of file multicast-udp-transport.cpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::processErrorCode ( const boost::system::error_code &  error)
protected

Definition at line 226 of file datagram-transport.hpp.

void nfd::face::Transport::receive ( Packet &&  packet)
protectedinherited

receive a link-layer packet

Warning
undefined behavior if packet size exceeds MTU limit

Definition at line 120 of file transport.cpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::receiveDatagram ( const uint8_t *  buffer,
size_t  nBytesReceived,
const boost::system::error_code &  error 
)

Receive datagram, translate buffer into packet, deliver to parent class.

Definition at line 173 of file datagram-transport.hpp.

template<class T , class U >
void nfd::face::DatagramTransport< T, U >::resetRecentlyReceived ( )
protected

Definition at line 257 of file datagram-transport.hpp.

void nfd::face::Transport::send ( Packet &&  packet)
inherited

send a link-layer packet

Note
This operation has no effect if getState() is neither UP nor DOWN
Warning
undefined behavior if packet size exceeds MTU limit

Definition at line 100 of file transport.cpp.

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

Definition at line 506 of file transport.hpp.

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

set Face and LinkService for Transport

Precondition
setFaceAndLinkService has not been called

Definition at line 77 of file transport.cpp.

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

Definition at line 463 of file transport.hpp.

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

Definition at line 421 of file transport.hpp.

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

Definition at line 475 of file transport.hpp.

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

changes face persistency setting

Definition at line 154 of file transport.cpp.

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

Definition at line 433 of file transport.hpp.

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

Definition at line 445 of file transport.hpp.

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

Definition at line 488 of file transport.hpp.

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

set transport state

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

Exceptions
std::runtime_errortransition is invalid.

Definition at line 177 of file transport.cpp.

Member Data Documentation

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

signals when transport state changes

Definition at line 274 of file transport.hpp.

template<class Protocol, class Addressing = Unicast>
protocol::endpoint nfd::face::DatagramTransport< Protocol, Addressing >::m_sender
protected

Definition at line 94 of file datagram-transport.hpp.

template<class Protocol, class Addressing = Unicast>
protocol::socket nfd::face::DatagramTransport< Protocol, Addressing >::m_socket
protected

Definition at line 93 of file datagram-transport.hpp.

const ssize_t nfd::face::Transport::MIN_MTU = 64
staticinherited

minimum MTU that may be set on a transport

This is done to ensure the NDNLPv2 fragmentation feature functions properly.

Definition at line 374 of file transport.hpp.

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 83 of file transport.hpp.

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 67 of file transport.hpp.

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 91 of file transport.hpp.

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 74 of file transport.hpp.