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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* 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 "forwarding-flags.hpp"
#include "encoding/element-listener.hpp"
struct ndn_Interest;
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&, uint64_t)> OnInterest;
/**
* An OnRegisterFailed function object is used to report when registerPrefix fails.
*/
typedef func_lib::function<void(const ptr_lib::shared_ptr<const Name>&)> OnRegisterFailed;
class Face;
class KeyChain;
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.
* @return The pending interest ID which can be used with removePendingInterest.
*/
uint64_t
expressInterest(const Interest& interest, const OnData& onData, const OnTimeout& onTimeout);
/**
* Remove the pending interest entry with the pendingInterestId from the pending interest table.
* This does not affect another pending interest with a different pendingInterestId, even it if has the same interest name.
* If there is no entry with the pendingInterestId, do nothing.
* @param pendingInterestId The ID returned from expressInterest.
*/
void
removePendingInterest(uint64_t pendingInterestId);
/**
* 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 onRegisterFailed A function object to call if failed to retrieve the connected hub’s ID or failed to register the prefix.
* This calls onRegisterFailed(prefix) where prefix is the prefix given to registerPrefix.
* @param flags The flags for finer control of which interests are forward to the application.
* @param wireFormat A WireFormat object used to encode the input. If omitted, use WireFormat getDefaultWireFormat().
* @return The registered prefix ID which can be used with removeRegisteredPrefix.
*/
uint64_t
registerPrefix
(const Name& prefix, const OnInterest& onInterest, const OnRegisterFailed& onRegisterFailed, const ForwardingFlags& flags,
WireFormat& wireFormat);
/**
* Remove the registered prefix entry with the registeredPrefixId from the pending interest table.
* This does not affect another registered prefix with a different registeredPrefixId, even it if has the same prefix name.
* If there is no entry with the registeredPrefixId, do nothing.
* @param registeredPrefixId The ID returned from registerPrefix.
*/
void
removeRegisteredPrefix(uint64_t registeredPrefixId);
/**
* 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 uint8_t *element, size_t elementLength);
void
shutdown();
private:
class PendingInterest {
public:
/**
* Create a new PitEntry and set the timeoutTime_ based on the current time and the interest lifetime.
* @param pendingInterestId A unique ID for this entry, which you should get with getNextPendingInteresId().
* @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.
*/
PendingInterest
(uint64_t pendingInterestId, const ptr_lib::shared_ptr<const Interest>& interest, const OnData& onData,
const OnTimeout& onTimeout);
/**
* Return the next unique pending interest ID.
*/
static uint64_t
getNextPendingInterestId()
{
return ++lastPendingInterestId_;
}
/**
* Return the pendingInterestId given to the constructor.
*/
uint64_t
getPendingInterestId() { return pendingInterestId_; }
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_;
}
/**
* Check if this interest is timed out.
* @param nowMilliseconds The current time in milliseconds from ndn_getNowMilliseconds.
* @return true if this interest timed out, otherwise false.
*/
bool
isTimedOut(MillisecondsSince1970 nowMilliseconds)
{
return timeoutTimeMilliseconds_ >= 0.0 && nowMilliseconds >= timeoutTimeMilliseconds_;
}
/**
* Call onTimeout_ (if defined). This ignores exceptions from the onTimeout_.
*/
void
callTimeout();
private:
ptr_lib::shared_ptr<const Interest> interest_;
std::vector<struct ndn_NameComponent> nameComponents_;
std::vector<struct ndn_ExcludeEntry> excludeEntries_;
ptr_lib::shared_ptr<struct ndn_Interest> interestStruct_;
static uint64_t lastPendingInterestId_; /**< A class variable used to get the next unique ID. */
uint64_t pendingInterestId_; /**< A unique identifier for this entry so it can be deleted */
const OnData onData_;
const OnTimeout onTimeout_;
MillisecondsSince1970 timeoutTimeMilliseconds_; /**< The time when the interest times out in milliseconds according to ndn_getNowMilliseconds, or -1 for no timeout. */
};
class RegisteredPrefix {
public:
/**
* Create a new PrefixEntry.
* @param registeredPrefixId A unique ID for this entry, which you should get with getNextRegisteredPrefixId().
* @param prefix A shared_ptr for the prefix.
* @param onInterest A function object to call when a matching data packet is received.
*/
RegisteredPrefix(uint64_t registeredPrefixId, const ptr_lib::shared_ptr<const Name>& prefix, const OnInterest& onInterest)
: registeredPrefixId_(registeredPrefixId), prefix_(prefix), onInterest_(onInterest)
{
}
/**
* Return the next unique entry ID.
*/
static uint64_t
getNextRegisteredPrefixId()
{
return ++lastRegisteredPrefixId_;
}
/**
* Return the registeredPrefixId given to the constructor.
*/
uint64_t
getRegisteredPrefixId() { return registeredPrefixId_; }
const ptr_lib::shared_ptr<const Name>&
getPrefix() { return prefix_; }
const OnInterest&
getOnInterest() { return onInterest_; }
private:
static uint64_t lastRegisteredPrefixId_; /**< A class variable used to get the next unique ID. */
uint64_t registeredPrefixId_; /**< A unique identifier for this entry so it can be deleted */
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:
/**
*
* @param node
* @param registeredPrefixId The PrefixEntry::getNextRegisteredPrefixId() which registerPrefix got so it could return it to the caller.
* @param prefix
* @param onInterest
* @param onRegisterFailed
* @param flags
* @param wireFormat
*/
Info(Node *node, uint64_t registeredPrefixId, const Name& prefix, const OnInterest& onInterest,
const OnRegisterFailed& onRegisterFailed, const ForwardingFlags& flags, WireFormat& wireFormat)
: node_(*node), registeredPrefixId_(registeredPrefixId), prefix_(new Name(prefix)), onInterest_(onInterest), onRegisterFailed_(onRegisterFailed),
flags_(flags), wireFormat_(wireFormat)
{
}
Node& node_;
uint64_t registeredPrefixId_;
ptr_lib::shared_ptr<const Name> prefix_;
const OnInterest onInterest_;
const OnRegisterFailed onRegisterFailed_;
ForwardingFlags flags_;
WireFormat& wireFormat_;
};
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.
*/
RegisteredPrefix*
getEntryForRegisteredPrefix(const Name& name);
/**
* Do the work of registerPrefix once we know we are connected with an ndndId_.
* @param registeredPrefixId The PrefixEntry::getNextRegisteredPrefixId() which registerPrefix got so it could return it to the caller.
* @param prefix
* @param onInterest
* @param onRegisterFailed
* @param flags
* @param wireFormat
*/
void
registerPrefixHelper
(uint64_t registeredPrefixId, const ptr_lib::shared_ptr<const Name>& prefix, const OnInterest& onInterest,
const OnRegisterFailed& onRegisterFailed, const ForwardingFlags& flags, WireFormat& wireFormat);
ptr_lib::shared_ptr<Transport> transport_;
ptr_lib::shared_ptr<const Transport::ConnectionInfo> connectionInfo_;
std::vector<ptr_lib::shared_ptr<PendingInterest> > pendingInterestTable_;
std::vector<ptr_lib::shared_ptr<RegisteredPrefix> > registeredPrefixTable_;
Interest ndndIdFetcherInterest_;
Blob ndndId_;
};
}
#endif