blob: 6301be7bfe4d0341f9e80321b9cf5ce36d9600a2 [file] [log] [blame]
/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_NODE_HPP
#define NDN_NODE_HPP
#include "common.hpp"
#include "interest.hpp"
#include "data.hpp"
#include "transport/tcp-transport.hpp"
#include "encoding/binary-xml-element-reader.hpp"
namespace ndn {
/**
* An OnData function object is used to pass a callback to expressInterest.
*/
typedef func_lib::function<void(const ptr_lib::shared_ptr<const Interest>& , const ptr_lib::shared_ptr<Data>& )> OnData;
/**
* An OnTimeout function object is used to pass a callback to expressInterest.
*/
typedef func_lib::function<void(const ptr_lib::shared_ptr<const Interest>& )> OnTimeout;
/**
* An OnInterest function object is used to pass a callback to registerPrefix.
*/
typedef func_lib::function<void
(const ptr_lib::shared_ptr<const Name>& , const ptr_lib::shared_ptr<const Interest>& , Transport& )> OnInterest;
class Face;
class Node : public ElementListener {
public:
/**
* Create a new Node for communication with an NDN hub with the given Transport object and connectionInfo.
* @param transport A shared_ptr to a Transport object used for communication.
* @param transport A shared_ptr to a Transport::ConnectionInfo to be used to connect to the transport.
*/
Node(const ptr_lib::shared_ptr<Transport>& transport, const ptr_lib::shared_ptr<const Transport::ConnectionInfo>& connectionInfo);
/**
* Send the Interest through the transport, read the entire response and call onData(interest, data).
* @param interest A reference to the Interest. This copies the Interest.
* @param onData A function object to call when a matching data packet is received. This copies the function object, so you may need to
* use func_lib::ref() as appropriate.
* @param onTimeout A function object to call if the interest times out. If onTimeout is an empty OnTimeout(), this does not use it.
* This copies the function object, so you may need to use func_lib::ref() as appropriate.
*/
void expressInterest(const Interest& interest, const OnData& onData, const OnTimeout& onTimeout);
/**
* Register prefix with the connected NDN hub and call onInterest when a matching interest is received.
* @param prefix A reference to a Name for the prefix to register. This copies the Name.
* @param onInterest A function object to call when a matching interest is received. This copies the function object, so you may need to
* use func_lib::ref() as appropriate.
* @param flags The flags for finer control of which interests are forward to the application.
*/
void registerPrefix(const Name& prefix, const OnInterest& onInterest, int flags);
/**
* Process any data to receive. For each element received, call onReceivedElement.
* This is non-blocking and will return immediately if there is no data to receive.
* You should repeatedly call this from an event loop, with calls to sleep as needed so that the loop doesn't use 100% of the CPU.
* @throw This may throw an exception for reading data or in the callback for processing the data. If you
* call this from an main event loop, you may want to catch and log/disregard all exceptions.
*/
void processEvents();
const ptr_lib::shared_ptr<Transport>& getTransport() { return transport_; }
const ptr_lib::shared_ptr<const Transport::ConnectionInfo>& getConnectionInfo() { return connectionInfo_; }
void onReceivedElement(const unsigned char *element, unsigned int elementLength);
void shutdown();
private:
class PitEntry {
public:
/**
* Create a new PitEntry and set the timeoutTime_ based on the current time and the interest lifetime.
* @param interest A shared_ptr for the interest.
* @param onData A function object to call when a matching data packet is received.
* @param onTimeout A function object to call if the interest times out. If onTimeout is an empty OnTimeout(), this does not use it.
*/
PitEntry(const ptr_lib::shared_ptr<const Interest>& interest, const OnData& onData, const OnTimeout& onTimeout);
const ptr_lib::shared_ptr<const Interest>& getInterest() { return interest_; }
const OnData& getOnData() { return onData_; }
/**
* Get the struct ndn_Interest for the interest_.
* WARNING: Assume that this PitEntry was created with new, so that no copy constructor is invoked between calls.
* This class is private to Node and only used by its methods, so this should be OK.
* TODO: Doesn't this functionality belong in the Interest class?
* @return A reference to the ndn_Interest struct.
* WARNING: The resulting pointers in are invalid uses getInterest() to manipulate the object which could reallocate memory.
*/
const struct ndn_Interest& getInterestStruct()
{
return interestStruct_;
}
/**
* If this interest is timed out, call onTimeout_ (if defined) and return true.
* @param parent The parent Node for the UpcallInfo.
* @param nowMilliseconds The current time in milliseconds from gettimeofday.
* @return true if this interest timed out and the timeout callback was called, otherwise false.
*/
bool checkTimeout(Node *parent, double nowMilliseconds);
private:
ptr_lib::shared_ptr<const Interest> interest_;
std::vector<struct ndn_NameComponent> nameComponents_;
std::vector<struct ndn_ExcludeEntry> excludeEntries_;
struct ndn_Interest interestStruct_;
const OnData onData_;
const OnTimeout onTimeout_;
double timeoutTimeMilliseconds_; /**< The time when the interest times out in milliseconds according to gettimeofday, or -1 for no timeout. */
};
class PrefixEntry {
public:
/**
* Create a new PrefixEntry.
* @param prefix A shared_ptr for the prefix.
* @param onInterest A function object to call when a matching data packet is received.
*/
PrefixEntry(const ptr_lib::shared_ptr<const Name>& prefix, const OnInterest& onInterest)
: prefix_(prefix), onInterest_(onInterest)
{
}
const ptr_lib::shared_ptr<const Name>& getPrefix() { return prefix_; }
const OnInterest& getOnInterest() { return onInterest_; }
private:
ptr_lib::shared_ptr<const Name> prefix_;
const OnInterest onInterest_;
};
/**
* An NdndIdFetcher receives the Data packet with the publisher public key digest for the connected NDN hub.
* This class is a function object for the callbacks. It only holds a pointer to an Info object, so it is OK to copy the pointer.
*/
class NdndIdFetcher {
public:
class Info;
NdndIdFetcher(ptr_lib::shared_ptr<NdndIdFetcher::Info> info)
: info_(info)
{
}
/**
* We received the ndnd ID.
* @param interest
* @param data
*/
void operator()(const ptr_lib::shared_ptr<const Interest>& interest, const ptr_lib::shared_ptr<Data>& ndndIdData);
/**
* We timed out fetching the ndnd ID.
* @param interest
*/
void operator()(const ptr_lib::shared_ptr<const Interest>& timedOutInterest);
class Info {
public:
Info(Node *node, const Name& prefix, const OnInterest& onInterest, int flags)
: node_(*node), prefix_(prefix), onInterest_(onInterest), flags_(flags)
{
}
Node& node_;
Name prefix_;
const OnInterest onInterest_;
int flags_;
};
private:
ptr_lib::shared_ptr<Info> info_;
};
/**
* Find the entry from the pit_ where the name conforms to the entry's interest selectors, and
* the entry interest name is the longest that matches name.
* @param name The name to find the interest for (from the incoming data packet).
* @return The index in pit_ of the pit entry, or -1 if not found.
*/
int getEntryIndexForExpressedInterest(const Name& name);
/**
* Find the first entry from the registeredPrefixTable_ where the entry prefix is the longest that matches name.
* @param name The name to find the PrefixEntry for (from the incoming interest packet).
* @return A pointer to the entry, or 0 if not found.
*/
PrefixEntry *getEntryForRegisteredPrefix(const Name& name);
/**
* Do the work of registerPrefix once we know we are connected with an ndndId_.
* @param prefix
* @param onInterest
* @param flags
*/
void registerPrefixHelper(const Name& prefix, const OnInterest& onInterest, int flags);
ptr_lib::shared_ptr<Transport> transport_;
ptr_lib::shared_ptr<const Transport::ConnectionInfo> connectionInfo_;
std::vector<ptr_lib::shared_ptr<PitEntry> > pit_;
std::vector<ptr_lib::shared_ptr<PrefixEntry> > registeredPrefixTable_;
Interest ndndIdFetcherInterest_;
Blob ndndId_;
};
}
#endif