size_t
Interest::wireEncode(EncodingImpl<TAG>& block) const
{
size_t totalLength = 0;
// Interest ::= INTEREST-TYPE TLV-LENGTH
// Name
// Selectors?
// Nonce
// Scope?
// InterestLifetime?
// Link?
// SelectedDelegation?
// (reverse encoding)
if (hasLink()) {
if (hasSelectedDelegation()) {
totalLength += prependNonNegativeIntegerBlock(block,
tlv::SelectedDelegation,
m_selectedDelegationIndex);
}
totalLength += prependBlock(block, m_link);
}
else {
BOOST_ASSERT(!hasSelectedDelegation());
}
// InterestLifetime
if (getInterestLifetime() >= time::milliseconds::zero() &&
getInterestLifetime() != DEFAULT_INTEREST_LIFETIME)
{
totalLength += prependNonNegativeIntegerBlock(block,
tlv::InterestLifetime,
getInterestLifetime().count());
}
// Scope
if (getScope() >= 0)
{
totalLength += prependNonNegativeIntegerBlock(block, tlv::Scope, getScope());
}
// Nonce
getNonce(); // to ensure that Nonce is properly set
totalLength += block.prependBlock(m_nonce);
// Selectors
if (hasSelectors())
{
totalLength += getSelectors().wireEncode(block);
}
// Name
totalLength += getName().wireEncode(block);
totalLength += block.prependVarNumber(totalLength);
totalLength += block.prependVarNumber(tlv::Interest);
return totalLength;
}
size_t
Interest::encode03(EncodingImpl<TAG>& encoder) const
{
size_t totalLength = 0;
// Encode as NDN Packet Format v0.3
// Interest ::= INTEREST-TYPE TLV-LENGTH
// Name
// CanBePrefix?
// MustBeFresh?
// ForwardingHint?
// Nonce?
// InterestLifetime?
// HopLimit?
// ApplicationParameters?
// (reverse encoding)
// ApplicationParameters
if (hasApplicationParameters()) {
totalLength += encoder.prependBlock(getApplicationParameters());
}
// HopLimit: not yet supported
// InterestLifetime
if (getInterestLifetime() != DEFAULT_INTEREST_LIFETIME) {
totalLength += prependNonNegativeIntegerBlock(encoder, tlv::InterestLifetime,
static_cast<uint64_t>(getInterestLifetime().count()));
}
// Nonce
uint32_t nonce = getNonce(); // if nonce was unset, getNonce generates a random nonce
totalLength += encoder.prependByteArrayBlock(tlv::Nonce, reinterpret_cast<uint8_t*>(&nonce), sizeof(nonce));
// ForwardingHint
if (!getForwardingHint().empty()) {
totalLength += getForwardingHint().wireEncode(encoder);
}
// MustBeFresh
if (getMustBeFresh()) {
totalLength += prependEmptyBlock(encoder, tlv::MustBeFresh);
}
// CanBePrefix
if (getCanBePrefix()) {
totalLength += prependEmptyBlock(encoder, tlv::CanBePrefix);
}
// Name
totalLength += getName().wireEncode(encoder);
totalLength += encoder.prependVarNumber(totalLength);
totalLength += encoder.prependVarNumber(tlv::Interest);
return totalLength;
}
size_t
Interest::wireEncode(EncodingImpl<TAG>& encoder) const
{
size_t totalLength = 0;
// Interest ::= INTEREST-TYPE TLV-LENGTH
// Name
// Selectors?
// Nonce
// InterestLifetime?
// ForwardingHint?
// (reverse encoding)
// ForwardingHint
if (m_forwardingHint.size() > 0) {
totalLength += m_forwardingHint.wireEncode(encoder);
}
// InterestLifetime
if (getInterestLifetime() != DEFAULT_INTEREST_LIFETIME) {
totalLength += prependNonNegativeIntegerBlock(encoder,
tlv::InterestLifetime,
getInterestLifetime().count());
}
// Nonce
uint32_t nonce = this->getNonce(); // assigns random Nonce if needed
totalLength += encoder.prependByteArray(reinterpret_cast<uint8_t*>(&nonce), sizeof(nonce));
totalLength += encoder.prependVarNumber(sizeof(nonce));
totalLength += encoder.prependVarNumber(tlv::Nonce);
// Selectors
if (hasSelectors()) {
totalLength += getSelectors().wireEncode(encoder);
}
// Name
totalLength += getName().wireEncode(encoder);
totalLength += encoder.prependVarNumber(totalLength);
totalLength += encoder.prependVarNumber(tlv::Interest);
return totalLength;
}
size_t
Interest::encode02(EncodingImpl<TAG>& encoder) const
{
size_t totalLength = 0;
// Encode as NDN Packet Format v0.2
// Interest ::= INTEREST-TYPE TLV-LENGTH
// Name
// Selectors?
// Nonce
// InterestLifetime?
// ForwardingHint?
// (reverse encoding)
// ForwardingHint
if (getForwardingHint().size() > 0) {
totalLength += getForwardingHint().wireEncode(encoder);
}
// InterestLifetime
if (getInterestLifetime() != DEFAULT_INTEREST_LIFETIME) {
totalLength += prependNonNegativeIntegerBlock(encoder, tlv::InterestLifetime,
static_cast<uint64_t>(getInterestLifetime().count()));
}
// Nonce
uint32_t nonce = getNonce(); // if nonce was unset, getNonce generates a random nonce
totalLength += encoder.prependByteArrayBlock(tlv::Nonce, reinterpret_cast<uint8_t*>(&nonce), sizeof(nonce));
// Selectors
if (hasSelectors()) {
totalLength += getSelectors().wireEncode(encoder);
}
// Name
totalLength += getName().wireEncode(encoder);
totalLength += encoder.prependVarNumber(totalLength);
totalLength += encoder.prependVarNumber(tlv::Interest);
return totalLength;
}
void
sendInitialInterest()
{
if (this->shouldStop())
return;
shared_ptr<Interest> interest = make_shared<Interest>(m_prefix);
interest->setMustBeFresh(true);
interest->setChildSelector(1);
interest->setInterestLifetime(getInterestLifetime());
m_lastInterestId = m_face.expressInterest(*interest,
bind(&NotificationSubscriber<Notification>::afterReceiveData, this, _2),
bind(&NotificationSubscriber<Notification>::afterReceiveNack, this, _2),
bind(&NotificationSubscriber<Notification>::afterTimeout, this));
}
void
sendNextInterest()
{
if (this->shouldStop())
return;
BOOST_ASSERT(m_lastSequenceNo !=
std::numeric_limits<uint64_t>::max());// overflow or missing initial reply
Name nextName = m_prefix;
nextName.appendSequenceNumber(m_lastSequenceNo + 1);
shared_ptr<Interest> interest = make_shared<Interest>(nextName);
interest->setInterestLifetime(getInterestLifetime());
m_lastInterestId = m_face.expressInterest(*interest,
bind(&NotificationSubscriber<Notification>::afterReceiveData, this, _2),
bind(&NotificationSubscriber<Notification>::afterReceiveNack, this, _2),
bind(&NotificationSubscriber<Notification>::afterTimeout, this));
}