dispatcher.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NDN_MGMT_DISPATCHER_HPP
#define NDN_MGMT_DISPATCHER_HPP

#include "../face.hpp"
#include "../security/key-chain.hpp"
#include "../encoding/block.hpp"
#include "control-response.hpp"
#include "control-parameters.hpp"
#include "status-dataset-context.hpp"

#include <unordered_map>

namespace ndn {
namespace mgmt {

// ---- AUTHORIZATION ----

typedef std::function<void(const std::string& requester)> AcceptContinuation;

enum class RejectReply {
  SILENT,
  STATUS403
};

typedef std::function<void(RejectReply act)> RejectContinuation;

typedef std::function<void(const Name& prefix, const Interest& interest,
                           const ControlParameters* params,
                           AcceptContinuation accept,
                           RejectContinuation reject)> Authorization;

Authorization
makeAcceptAllAuthorization();

// ---- CONTROL COMMAND ----

typedef std::function<bool(const ControlParameters& params)> ValidateParameters;

typedef std::function<void(const ControlResponse& resp)> CommandContinuation;

typedef std::function<void(const Name& prefix, const Interest& interest,
                           const ControlParameters& params,
                           CommandContinuation done)> ControlCommandHandler;


typedef std::function<void(const Name& prefix, const Interest& interest,
                           StatusDatasetContext& context)> StatusDatasetHandler;

//---- NOTIFICATION STREAM ----

typedef std::function<void(const Block& notification)> PostNotification;

// ---- DISPATCHER ----

class Dispatcher : noncopyable
{
  class Error : public std::runtime_error
  {
  public:
    explicit
    Error(const std::string& what)
      : std::runtime_error(what)
    {
    }
  };

public:
  Dispatcher(Face& face, security::KeyChain& keyChain,
             const security::SigningInfo& signingInfo = security::SigningInfo());

  virtual
  ~Dispatcher();

  void
  addTopPrefix(const Name& prefix, bool wantRegister = true,
               const security::SigningInfo& signingInfo = security::SigningInfo());

  void
  removeTopPrefix(const Name& prefix);

public: // ControlCommand
  template<typename CP>
  void
  addControlCommand(const PartialName& relPrefix,
                    Authorization authorization,
                    ValidateParameters validateParams,
                    ControlCommandHandler handler);

public: // StatusDataset
  void
  addStatusDataset(const PartialName& relPrefix,
                   Authorization authorization,
                   StatusDatasetHandler handler);

public: // NotificationStream
  PostNotification
  addNotificationStream(const PartialName& relPrefix);

private:
  typedef std::function<void(const Name& prefix,
                             const Interest& interest)> InterestHandler;

  typedef std::function<void(const std::string& requester,
                             const Name& prefix,
                             const Interest& interest,
                             const ControlParameters*)> AuthorizationAcceptedCallback;

  typedef std::function<void(RejectReply act,
                             const Interest& interest)> AuthorizationRejectedCallback;

  typedef std::function<shared_ptr<ControlParameters>(const name::Component& component)>
  ControlParametersParser;

  bool
  isOverlappedWithOthers(const PartialName& relPrefix);

  void
  afterAuthorizationRejected(RejectReply act, const Interest& interest);

  void
  sendData(const Name& dataName, const Block& content,
           const MetaInfo& metaInfo);

  void
  processControlCommandInterest(const Name& prefix,
                                const Name& relPrefix,
                                const Interest& interest,
                                const ControlParametersParser& parser,
                                const Authorization& authorization,
                                const AuthorizationAcceptedCallback& accepted,
                                const AuthorizationRejectedCallback& rejected);

  void
  processAuthorizedControlCommandInterest(const std::string& requester,
                                          const Name& prefix,
                                          const Interest& interest,
                                          const ControlParameters* parameters,
                                          const ValidateParameters& validate,
                                          const ControlCommandHandler& handler);

  void
  sendControlResponse(const ControlResponse& resp, const Interest& interest, bool isNack = false);

  void
  processStatusDatasetInterest(const Name& prefix,
                               const Interest& interest,
                               const Authorization& authorization,
                               const AuthorizationAcceptedCallback& accepted,
                               const AuthorizationRejectedCallback& rejected);

  void
  processAuthorizedStatusDatasetInterest(const std::string& requester,
                                         const Name& prefix,
                                         const Interest& interest,
                                         const StatusDatasetHandler& handler);

  void
  postNotification(const Block& notification, const PartialName& relPrefix);

private:
  struct TopPrefixEntry
  {
    Name topPrefix;
    bool wantRegister;
    const ndn::RegisteredPrefixId* registerPrefixId;
    std::vector<const ndn::InterestFilterId*> interestFilters;
  };
  std::unordered_map<Name, TopPrefixEntry> m_topLevelPrefixes;

  Face& m_face;
  security::KeyChain& m_keyChain;
  security::SigningInfo m_signingInfo;

  typedef std::unordered_map<PartialName, InterestHandler> HandlerMap;
  typedef HandlerMap::iterator HandlerMapIt;
  HandlerMap m_handlers;

  // NotificationStream name => next sequence number
  std::unordered_map<Name, uint64_t> m_streams;
};

template<typename CP>
void
Dispatcher::addControlCommand(const PartialName& relPrefix,
                              Authorization authorization,
                              ValidateParameters validateParams,
                              ControlCommandHandler handler)
{
  if (!m_topLevelPrefixes.empty()) {
    throw std::domain_error("one or more top-level prefix has been added");
  }

  if (isOverlappedWithOthers(relPrefix)) {
    throw std::out_of_range("relPrefix overlaps with another relPrefix");
  }

  ControlParametersParser parser =
    [] (const name::Component& component) -> shared_ptr<ControlParameters> {
    return make_shared<CP>(component.blockFromValue());
  };

  AuthorizationAcceptedCallback accepted =
    bind(&Dispatcher::processAuthorizedControlCommandInterest, this,
         _1, _2, _3, _4, validateParams, handler);

  AuthorizationRejectedCallback rejected =
    bind(&Dispatcher::afterAuthorizationRejected, this, _1, _2);

  m_handlers[relPrefix] = bind(&Dispatcher::processControlCommandInterest, this,
                               _1, relPrefix, _2, parser, authorization, accepted, rejected);
}

} // namespace mgmt
} // namespace ndn
#endif // NDN_MGMT_DISPATCHER_HPP