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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (c) 2013-2014, Regents of the University of California.
* All rights reserved.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* This file licensed under New BSD License. See COPYING for detailed information about
* ndn-cxx library copyright, permissions, and redistribution restrictions.
*
* Based on code originally written by Jeff Thompson <jefft0@remap.ucla.edu>
*/
#ifndef NDN_INTEREST_HPP
#define NDN_INTEREST_HPP
#include "common.hpp"
#include "name.hpp"
#include "selectors.hpp"
#include "interest-filter.hpp"
#include "management/nfd-local-control-header.hpp"
namespace ndn {
class Data;
const time::seconds DEFAULT_INTEREST_LIFETIME = time::seconds(4);
/**
* An Interest holds a Name and other fields for an Interest
*/
class Interest : public enable_shared_from_this<Interest>
{
public:
/**
* @brief Create a new Interest with an empty name (`ndn:/`)
*
* Note that in certain contexts that use Interest::shared_from_this(), Interest must be
* created using `make_shared`:
*
* shared_ptr<Interest> interest = make_shared<Interest>();
*
* Otherwise, Interest::shared_from_this() will throw an exception.
*/
Interest()
: m_nonce(0)
, m_scope(-1)
, m_interestLifetime(time::milliseconds::min())
{
}
/**
* @brief Create a new Interest with the given name
*
* @param name The name for the interest.
*
* Note that in certain contexts that use Interest::shared_from_this(), Interest must be
* created using `make_shared`:
*
* shared_ptr<Interest> interest = make_shared<Interest>(name);
*
* Otherwise, Interest::shared_from_this() will throw an exception.
*/
Interest(const Name& name)
: m_name(name)
, m_nonce(0)
, m_scope(-1)
, m_interestLifetime(time::milliseconds::min())
{
}
/**
* @brief Create a new Interest with the given name and interest lifetime
*
* @param name The name for the interest.
* @param interestLifetime The interest lifetime in time::milliseconds, or -1 for none.
*
* Note that in certain contexts that use Interest::shared_from_this(), Interest must be
* created using `make_shared`:
*
* shared_ptr<Interest> interest = make_shared<Interest>(name, time::seconds(1));
*
* Otherwise, Interest::shared_from_this() will throw an exception.
*/
Interest(const Name& name, const time::milliseconds& interestLifetime)
: m_name(name)
, m_nonce(0)
, m_scope(-1)
, m_interestLifetime(interestLifetime)
{
}
/**
* @brief Create a new Interest for the given name, selectors, and guiders
*
* Note that in certain contexts that use Interest::shared_from_this(), Interest must be
* created using `make_shared`:
*
* shared_ptr<Interest> interest = make_shared<Interest>(...);
*
* Otherwise, Interest::shared_from_this() will throw an exception.
*/
Interest(const Name& name,
const Selectors& selectors,
int scope,
const time::milliseconds& interestLifetime,
uint32_t nonce = 0)
: m_name(name)
, m_selectors(selectors)
, m_nonce(nonce)
, m_scope(scope)
, m_interestLifetime(interestLifetime)
{
}
/**
* @brief Create a new Interest for the given name and parameters
*
* @deprecated Interest().setX(...).setY(...)
* or use the overload taking Selectors
*
* Note that in certain contexts that use Interest::shared_from_this(), Interest must be
* created using `make_shared`:
*
* shared_ptr<Interest> interest = make_shared<Interest>(...);
*
* Otherwise, Interest::shared_from_this() will throw an exception.
*/
Interest(const Name& name,
int minSuffixComponents, int maxSuffixComponents,
const Exclude& exclude,
int childSelector,
bool mustBeFresh,
int scope,
const time::milliseconds& interestLifetime,
uint32_t nonce = 0)
: m_name(name)
, m_selectors(minSuffixComponents, maxSuffixComponents, exclude, childSelector, mustBeFresh)
, m_nonce(nonce)
, m_scope(scope)
, m_interestLifetime(interestLifetime)
{
}
/**
* @brief Create from wire encoding
*
* Note that in certain contexts that use Interest::shared_from_this(), Interest must be
* created using `make_shared`:
*
* shared_ptr<Interest> interest = make_shared<Interest>(wire);
*
* Otherwise, Interest::shared_from_this() will throw an exception.
*/
explicit
Interest(const Block& wire)
{
wireDecode(wire);
}
/**
* @brief Fast encoding or block size estimation
*/
template<bool T>
inline size_t
wireEncode(EncodingImpl<T>& block) const;
/**
* @brief Encode to a wire format
*/
inline const Block&
wireEncode() const;
/**
* @brief Decode from the wire format
*/
inline void
wireDecode(const Block& wire);
/**
* @brief Check if already has wire
*/
inline bool
hasWire() const;
/**
* @brief Encode the name according to the NDN URI Scheme
*
* If there are interest selectors, this method will append "?" and add the selectors as
* a query string. For example, "/test/name?ndn.ChildSelector=1"
*/
inline std::string
toUri() const;
/**
* @brief Check if Interest has any selectors present
*/
inline bool
hasSelectors() const;
/**
* @brief Check if Interest, including selectors, matches the given @p name
*
* @param name The name to be matched. If this is a Data name, it shall contain the
* implicit digest component
*/
bool
matchesName(const Name& name) const;
/**
* @brief Check if Interest can be satisfied by @p data.
*
* This method considers Name, MinSuffixComponents, MaxSuffixComponents,
* PublisherPublicKeyLocator, and Exclude.
* This method does not consider ChildSelector and MustBeFresh.
*
* @todo recognize implicit digest component
*/
bool
matchesData(const Data& data) const;
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
// Getters/setters
const Name&
getName() const
{
return m_name;
}
Interest&
setName(const Name& name)
{
m_name = name;
m_wire.reset();
return *this;
}
//
const Selectors&
getSelectors() const
{
return m_selectors;
}
Interest&
setSelectors(const Selectors& selectors)
{
m_selectors = selectors;
m_wire.reset();
return *this;
}
//
int
getScope() const
{
return m_scope;
}
Interest&
setScope(int scope)
{
m_scope = scope;
m_wire.reset();
return *this;
}
//
const time::milliseconds&
getInterestLifetime() const
{
return m_interestLifetime;
}
Interest&
setInterestLifetime(const time::milliseconds& interestLifetime)
{
m_interestLifetime = interestLifetime;
m_wire.reset();
return *this;
}
//
/**
* @brief Get Interest's nonce
*
* If nonce was not set before this call, it will be automatically assigned to a random value
*
* Const reference needed for C decoding
*/
const uint32_t&
getNonce() const;
Interest&
setNonce(uint32_t nonce)
{
m_nonce = nonce;
m_wire.reset();
return *this;
}
//
nfd::LocalControlHeader&
getLocalControlHeader()
{
return m_localControlHeader;
}
const nfd::LocalControlHeader&
getLocalControlHeader() const
{
return m_localControlHeader;
}
// helper methods for LocalControlHeader
uint64_t
getIncomingFaceId() const
{
return getLocalControlHeader().getIncomingFaceId();
}
Interest&
setIncomingFaceId(uint64_t incomingFaceId)
{
getLocalControlHeader().setIncomingFaceId(incomingFaceId);
// ! do not reset Interest's wire !
return *this;
}
//
// NextHopFaceId helpers make sense only for Interests
uint64_t
getNextHopFaceId() const
{
return getLocalControlHeader().getNextHopFaceId();
}
Interest&
setNextHopFaceId(uint64_t nextHopFaceId)
{
getLocalControlHeader().setNextHopFaceId(nextHopFaceId);
// ! do not reset Interest's wire !
return *this;
}
//
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
// Wrappers for Selectors
//
int
getMinSuffixComponents() const
{
return m_selectors.getMinSuffixComponents();
}
Interest&
setMinSuffixComponents(int minSuffixComponents)
{
m_selectors.setMinSuffixComponents(minSuffixComponents);
m_wire.reset();
return *this;
}
//
int
getMaxSuffixComponents() const
{
return m_selectors.getMaxSuffixComponents();
}
Interest&
setMaxSuffixComponents(int maxSuffixComponents)
{
m_selectors.setMaxSuffixComponents(maxSuffixComponents);
m_wire.reset();
return *this;
}
//
const KeyLocator&
getPublisherPublicKeyLocator() const
{
return m_selectors.getPublisherPublicKeyLocator();
}
Interest&
setPublisherPublicKeyLocator(const KeyLocator& keyLocator)
{
m_selectors.setPublisherPublicKeyLocator(keyLocator);
m_wire.reset();
return *this;
}
//
const Exclude&
getExclude() const
{
return m_selectors.getExclude();
}
Interest&
setExclude(const Exclude& exclude)
{
m_selectors.setExclude(exclude);
m_wire.reset();
return *this;
}
//
int
getChildSelector() const
{
return m_selectors.getChildSelector();
}
Interest&
setChildSelector(int childSelector)
{
m_selectors.setChildSelector(childSelector);
m_wire.reset();
return *this;
}
//
int
getMustBeFresh() const
{
return m_selectors.getMustBeFresh();
}
Interest&
setMustBeFresh(bool mustBeFresh)
{
m_selectors.setMustBeFresh(mustBeFresh);
m_wire.reset();
return *this;
}
public: // EqualityComparable concept
bool
operator==(const Interest& other) const
{
return wireEncode() == other.wireEncode();
}
bool
operator!=(const Interest& other) const
{
return !(*this == other);
}
private:
Name m_name;
Selectors m_selectors;
mutable uint32_t m_nonce;
int m_scope;
time::milliseconds m_interestLifetime;
mutable Block m_wire;
nfd::LocalControlHeader m_localControlHeader;
friend class nfd::LocalControlHeader;
};
std::ostream&
operator<<(std::ostream& os, const Interest& interest);
inline std::string
Interest::toUri() const
{
std::ostringstream os;
os << *this;
return os.str();
}
inline bool
Interest::hasSelectors() const
{
return !m_selectors.empty();
}
template<bool T>
inline size_t
Interest::wireEncode(EncodingImpl<T>& block) const
{
size_t totalLength = 0;
// Interest ::= INTEREST-TYPE TLV-LENGTH
// Name
// Selectors?
// Nonce
// Scope?
// InterestLifetime?
// (reverse encoding)
// 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
totalLength += prependNonNegativeIntegerBlock(block, Tlv::Nonce, getNonce());
// Selectors
if (!getSelectors().empty())
{
totalLength += getSelectors().wireEncode(block);
}
// Name
totalLength += getName().wireEncode(block);
totalLength += block.prependVarNumber (totalLength);
totalLength += block.prependVarNumber (Tlv::Interest);
return totalLength;
}
inline const Block&
Interest::wireEncode() const
{
if (m_wire.hasWire())
return m_wire;
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
m_wire = buffer.block();
return m_wire;
}
inline void
Interest::wireDecode(const Block& wire)
{
m_wire = wire;
m_wire.parse();
// Interest ::= INTEREST-TYPE TLV-LENGTH
// Name
// Selectors?
// Nonce
// Scope?
// InterestLifetime?
if (m_wire.type() != Tlv::Interest)
throw Tlv::Error("Unexpected TLV number when decoding Interest");
// Name
m_name.wireDecode(m_wire.get(Tlv::Name));
// Selectors
Block::element_const_iterator val = m_wire.find(Tlv::Selectors);
if (val != m_wire.elements_end())
{
m_selectors.wireDecode(*val);
}
else
m_selectors = Selectors();
// Nonce
val = m_wire.find(Tlv::Nonce);
if (val != m_wire.elements_end())
{
m_nonce = readNonNegativeInteger(*val);
}
else
m_nonce = 0;
// Scope
val = m_wire.find(Tlv::Scope);
if (val != m_wire.elements_end())
{
m_scope = readNonNegativeInteger(*val);
}
else
m_scope = -1;
// InterestLifetime
val = m_wire.find(Tlv::InterestLifetime);
if (val != m_wire.elements_end())
{
m_interestLifetime = time::milliseconds(readNonNegativeInteger(*val));
}
else
{
m_interestLifetime = DEFAULT_INTEREST_LIFETIME;
}
}
inline bool
Interest::hasWire() const
{
return m_wire.hasWire();
}
} // namespace ndn
#endif // NDN_INTEREST_HPP