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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_FACE_HPP
#define NDN_FACE_HPP
#include "common.hpp"
#include "interest.hpp"
#include "data.hpp"
#include "transport/transport.hpp"
#include "transport/unix-transport.hpp"
#include "transport/tcp-transport.hpp"
#include "management/controller.hpp"
#include "util/scheduler.hpp"
#include "detail/registered-prefix.hpp"
#include "detail/pending-interest.hpp"
namespace ndn {
struct PendingInterestId;
struct RegisteredPrefixId;
/**
* An OnData function object is used to pass a callback to expressInterest.
*/
typedef function<void(const Interest&, Data&)> OnData;
/**
* An OnTimeout function object is used to pass a callback to expressInterest.
*/
typedef function<void(const Interest&)> OnTimeout;
/**
* An OnInterest function object is used to pass a callback to registerPrefix.
*/
typedef function<void (const Name&, const Interest&)> OnInterest;
/**
* An OnRegisterFailed function object is used to report when registerPrefix fails.
*/
typedef function<void(const Name&, const std::string&)> OnSetInterestFilterFailed;
/**
* @brief Abstraction to communicate with local or remote NDN forwarder
*/
class Face : noncopyable
{
public:
class Error : public std::runtime_error
{
public:
explicit
Error(const std::string& what)
: std::runtime_error(what)
{
}
};
/**
* @brief Create a new Face using the default transport (UnixTransport)
*
* @throws ConfigFile::Error on configuration file parse failure
* @throws Face::Error on unsupported protocol
*/
Face();
/**
* @brief Create a new Face using the default transport (UnixTransport)
*
* @deprecated This constructor is deprecated. Use `Face(boost::asio::io_service&)`
* instead.
*
* @param ioService A shared pointer to boost::io_service object that should control all
* IO operations
* @throws ConfigFile::Error on configuration file parse failure
* @throws Face::Error on unsupported protocol
*/
explicit
Face(const shared_ptr<boost::asio::io_service>& ioService);
/**
* @brief Create a new Face using the default transport (UnixTransport)
*
* @par Usage examples:
*
* Face face1;
* Face face2(face1.getIoService());
*
* // Now the following ensures that events on both faces are processed
* face1.processEvents();
* // or face1.getIoService().run();
*
* @par or
*
* boost::asio::io_service ioService;
* Face face1(ioService);
* Face face2(ioService);
* ...
*
* ioService.run();
*
* @param ioService A reference to boost::io_service object that should control all
* IO operations.
* @throws ConfigFile::Error on configuration file parse failure
* @throws Face::Error on unsupported protocol
*/
explicit
Face(boost::asio::io_service& ioService);
/**
* @brief Create a new Face using TcpTransport
*
* @param host The host of the NDN hub.
* @param port The port or service name of the NDN hub. If omitted. use 6363.
* @throws Face::Error on unsupported protocol
*/
Face(const std::string& host, const std::string& port = "6363");
/**
* @brief Create a new Face using the given Transport
* @param transport A shared_ptr to a Transport object used for communication.
* @throws Face::Error on unsupported protocol
*/
explicit
Face(const shared_ptr<Transport>& transport);
/**
* @brief Create a new Face using the given Transport and IO service object
*
* @sa Face(boost::asio::io_service&)
*
* @throws Face::Error on unsupported protocol
*/
Face(const shared_ptr<Transport>& transport,
boost::asio::io_service& ioService);
/**
* @brief Set controller used for prefix registration
*/
void
setController(const shared_ptr<Controller>& controller);
/**
* @brief Express Interest
*
* @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.
* @param onTimeout A function object to call if the interest times out.
* If onTimeout is an empty OnTimeout(), this does not use it.
*
* @return The pending interest ID which can be used with removePendingInterest.
*/
const PendingInterestId*
expressInterest(const Interest& interest,
const OnData& onData, const OnTimeout& onTimeout = OnTimeout());
/**
* @brief Express Interest using name and Interest template
*
* @param name Name of the Interest
* @param tmpl Interest template to fill parameters
* @param onData A callback to call when a matching data packet is received.
* @param onTimeout A callback to call if the interest times out.
* If onTimeout is an empty OnTimeout(), this does not use it.
*
* @return The pending interest ID which can be used with removePendingInterest.
*/
const PendingInterestId*
expressInterest(const Name& name,
const Interest& tmpl,
const OnData& onData, const OnTimeout& onTimeout = OnTimeout());
/**
* @brief 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(const PendingInterestId* pendingInterestId);
/**
* @brief 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
* @param onInterest A function object to call when a matching interest is received
*
* @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.
* @return The registered prefix ID which can be used with removeRegisteredPrefix.
*/
const RegisteredPrefixId*
setInterestFilter(const Name& prefix,
const OnInterest& onInterest,
const OnSetInterestFilterFailed& onSetInterestFilterFailed);
/**
* @brief 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
unsetInterestFilter(const RegisteredPrefixId* registeredPrefixId);
/**
* @brief Publish data packet
*
* This method can be called to satisfy the incoming Interest or to put Data packet into
* the cache of the local NDN forwarder
*/
void
put(const Data& data);
/**
* @brief Process any data to receive or call timeout callbacks.
*
* This call will block forever (default timeout == 0) to process IO on the face.
* To exit, one expected to call face.shutdown() from one of the callback methods.
*
* If positive timeout is specified, then processEvents will exit after this timeout, if
* not stopped earlier with face.shutdown() or when all active events finish. The call
* can be called repeatedly, if desired.
*
* If negative timeout is specified, then processEvents will not block and process only
* pending events.
*
* @param timeout maximum time to block the thread.
* @param keepThread Keep thread in a blocked state (in event processing), even when
* there are no outstanding events (e.g., no Interest/Data is expected)
*
* @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 time::milliseconds& timeout = time::milliseconds::zero(),
bool keepThread = false);
/**
* @brief Shutdown face operations
*
* This method cancels all pending operations and closes connection to NDN Forwarder.
*
* Note that this method does not stop IO service and if the same IO service is shared
* between multiple Faces or with other IO objects (e.g., Scheduler).
*/
void
shutdown();
/**
* @brief Get shared_ptr of the IO service object
*
* @deprecated Use getIoService instead
*/
shared_ptr<boost::asio::io_service>
ioService()
{
return m_ioService;
}
/**
* @brief Get reference to IO service object
*/
boost::asio::io_service&
getIoService()
{
return *m_ioService;
}
private:
/**
* @throws Face::Error on unsupported protocol
*/
void
construct(const shared_ptr<Transport>& transport,
const shared_ptr<boost::asio::io_service>& ioService);
bool
isSupportedNfdProtocol(const std::string& protocol);
bool
isSupportedNrdProtocol(const std::string& protocol);
bool
isSupportedNdndProtocol(const std::string& protocol);
class ProcessEventsTimeout
{
};
typedef std::list<shared_ptr<PendingInterest> > PendingInterestTable;
typedef std::list<shared_ptr<RegisteredPrefix> > RegisteredPrefixTable;
void
asyncExpressInterest(const shared_ptr<const Interest>& interest,
const OnData& onData, const OnTimeout& onTimeout);
void
asyncRemovePendingInterest(const PendingInterestId* pendingInterestId);
void
asyncUnsetInterestFilter(const RegisteredPrefixId* registeredPrefixId);
void
finalizeUnsetInterestFilter(RegisteredPrefixTable::iterator item);
void
onReceiveElement(const Block& wire);
void
asyncShutdown();
static void
fireProcessEventsTimeout(const boost::system::error_code& error);
void
satisfyPendingInterests(Data& data);
void
processInterestFilters(Interest& interest);
void
checkPitExpire();
private:
shared_ptr<boost::asio::io_service> m_ioService;
shared_ptr<boost::asio::io_service::work> m_ioServiceWork; // if thread needs to be preserved
shared_ptr<monotonic_deadline_timer> m_pitTimeoutCheckTimer;
bool m_pitTimeoutCheckTimerActive;
shared_ptr<monotonic_deadline_timer> m_processEventsTimeoutTimer;
shared_ptr<Transport> m_transport;
PendingInterestTable m_pendingInterestTable;
RegisteredPrefixTable m_registeredPrefixTable;
shared_ptr<Controller> m_fwController;
ConfigFile m_config;
};
inline bool
Face::isSupportedNfdProtocol(const std::string& protocol)
{
return protocol == "nfd-0.1";
}
inline bool
Face::isSupportedNrdProtocol(const std::string& protocol)
{
return protocol == "nrd-0.1";
}
inline bool
Face::isSupportedNdndProtocol(const std::string& protocol)
{
return protocol == "ndnd-tlv-0.7";
}
} // namespace ndn
#endif // NDN_FACE_HPP