text: //------------------------------------------------------------------------------
  /*
      This file is part of rippled: https://github.com/ripple/rippled
      Copyright (c) 2012, 2013 Ripple Labs Inc.
  
      Permission to use, copy, modify, and/or distribute this software for any
      purpose  with  or without fee is hereby granted, provided that the above
      copyright notice and this permission notice appear in all copies.
  
      THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
      MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
      ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
  //==============================================================================
  
  #include <blocmatrix/rpc/impl/Handler.h>
  #include <blocmatrix/rpc/handlers/Handlers.h>
  #include <blocmatrix/rpc/handlers/Version.h>
  
  namespace blocmatrix {
  namespace RPC {
  namespace {
  
  /** Adjust an old-style handler to be call-by-reference. */
  template <typename Function>
  Handler::Method<Json::Value> byRef (Function const& f)
  {
      return [f] (Context& context, Json::Value& result)
      {
          result = f (context);
          if (result.type() != Json::objectValue)
          {
              assert (false);
              result = RPC::makeObjectValue (result);
          }
  
          return Status();
      };
  }
  
  template <class Object, class HandlerImpl>
  Status handle (Context& context, Object& object)
  {
      HandlerImpl handler (context);
  
      auto status = handler.check ();
      if (status)
          status.inject (object);
      else
          handler.writeResult (object);
      return status;
  };
  
  Handler const handlerArray[] {
      // Some handlers not specified here are added to the table via addHandler()
      // Request-response methods
      {   "account_info",         byRef (&doAccountInfo),         Role::USER,  NO_CONDITION  },
      {   "account_currencies",   byRef (&doAccountCurrencies),   Role::USER,  NO_CONDITION  },
      {   "account_lines",        byRef (&doAccountLines),        Role::USER,  NO_CONDITION  },
      {   "account_channels",     byRef (&doAccountChannels),     Role::USER,  NO_CONDITION  },
      {   "account_objects",      byRef (&doAccountObjects),      Role::USER,  NO_CONDITION  },
      {   "account_offers",       byRef (&doAccountOffers),       Role::USER,  NO_CONDITION  },
      {   "account_tx",           byRef (&doAccountTxSwitch),     Role::USER,  NO_CONDITION  },
      {   "blacklist",            byRef (&doBlackList),           Role::ADMIN,   NO_CONDITION     },
      {   "book_offers",          byRef (&doBookOffers),          Role::USER,  NO_CONDITION  },
      {   "can_delete",           byRef (&doCanDelete),           Role::ADMIN,   NO_CONDITION     },
      {   "channel_authorize",    byRef (&doChannelAuthorize),    Role::USER,  NO_CONDITION  },
      {   "channel_verify",       byRef (&doChannelVerify),       Role::USER,  NO_CONDITION  },
      {   "connect",              byRef (&doConnect),             Role::ADMIN,   NO_CONDITION     },
      {   "consensus_info",       byRef (&doConsensusInfo),       Role::ADMIN,   NO_CONDITION     },
      {   "deposit_authorized",   byRef (&doDepositAuthorized),   Role::USER,  NO_CONDITION  },
      {   "download_shard",       byRef (&doDownloadShard),       Role::ADMIN,   NO_CONDITION     },
      {   "gateway_balances",     byRef (&doGatewayBalances),     Role::USER,  NO_CONDITION  },
      {   "get_counts",           byRef (&doGetCounts),           Role::ADMIN,   NO_CONDITION     },
      {   "feature",              byRef (&doFeature),             Role::ADMIN,   NO_CONDITION     },
      {   "fee",                  byRef (&doFee),                 Role::USER,    NEEDS_CURRENT_LEDGER     },
      {   "fetch_info",           byRef (&doFetchInfo),           Role::ADMIN,   NO_CONDITION     },
      {   "ledger_accept",        byRef (&doLedgerAccept),        Role::ADMIN,   NEEDS_CURRENT_LEDGER  },
      {   "ledger_cleaner",       byRef (&doLedgerCleaner),       Role::ADMIN,   NEEDS_NETWORK_CONNECTION  },
      {   "ledger_closed",        byRef (&doLedgerClosed),        Role::USER,  NO_CONDITION   },
      {   "ledger_current",       byRef (&doLedgerCurrent),       Role::USER,  NEEDS_CURRENT_LEDGER  },
      {   "ledger_data",          byRef (&doLedgerData),          Role::USER,  NO_CONDITION  },
      {   "ledger_entry",         byRef (&doLedgerEntry),         Role::USER,  NO_CONDITION  },
      {   "ledger_header",        byRef (&doLedgerHeader),        Role::USER,  NO_CONDITION  },
      {   "ledger_request",       byRef (&doLedgerRequest),       Role::ADMIN,   NO_CONDITION     },
      {   "log_level",            byRef (&doLogLevel),            Role::ADMIN,   NO_CONDITION     },
      {   "logrotate",            byRef (&doLogRotate),           Role::ADMIN,   NO_CONDITION     },
      {   "noblocmatrix_check",       byRef (&doNoBlocmatrixCheck),       Role::USER,  NO_CONDITION  },
      {   "owner_info",           byRef (&doOwnerInfo),           Role::USER,  NEEDS_CURRENT_LEDGER  },
      {   "peers",                byRef (&doPeers),               Role::ADMIN,   NO_CONDITION     },
      {   "path_find",            byRef (&doPathFind),            Role::USER,  NEEDS_CURRENT_LEDGER  },
      {   "ping",                 byRef (&doPing),                Role::USER,  NO_CONDITION     },
      {   "print",                byRef (&doPrint),               Role::ADMIN,   NO_CONDITION     },
  //      {   "profile",              byRef (&doProfile),             Role::USER,  NEEDS_CURRENT_LEDGER  },
      {   "random",               byRef (&doRandom),              Role::USER,  NO_CONDITION     },
      {   "blocmatrix_path_find",     byRef (&doBlocmatrixPathFind),      Role::USER,  NO_CONDITION  },
      {   "sign",                 byRef (&doSign),                Role::USER,  NO_CONDITION     },
      {   "sign_for",             byRef (&doSignFor),             Role::USER,  NO_CONDITION     },
      {   "submit",               byRef (&doSubmit),              Role::USER,  NEEDS_CURRENT_LEDGER  },
      {   "submit_multisigned",   byRef (&doSubmitMultiSigned),   Role::USER,  NEEDS_CURRENT_LEDGER  },
      {   "server_info",          byRef (&doServerInfo),          Role::USER,  NO_CONDITION     },
      {   "server_state",         byRef (&doServerState),         Role::USER,  NO_CONDITION     },
      {   "crawl_shards",         byRef (&doCrawlShards),         Role::ADMIN,  NO_CONDITION     },
      {   "stop",                 byRef (&doStop),                Role::ADMIN,   NO_CONDITION     },
      {   "transaction_entry",    byRef (&doTransactionEntry),    Role::USER,  NO_CONDITION  },
      {   "tx",                   byRef (&doTx),                  Role::USER,  NEEDS_NETWORK_CONNECTION  },
      {   "tx_history",           byRef (&doTxHistory),           Role::USER,  NO_CONDITION     },
      {   "unl_list",             byRef (&doUnlList),             Role::ADMIN,   NO_CONDITION     },
      {   "validation_create",    byRef (&doValidationCreate),    Role::ADMIN,   NO_CONDITION     },
      {   "validators",           byRef (&doValidators),          Role::ADMIN,   NO_CONDITION     },
      {   "validator_list_sites", byRef (&doValidatorListSites),  Role::ADMIN,   NO_CONDITION     },
      {   "wallet_propose",       byRef (&doWalletPropose),       Role::ADMIN,   NO_CONDITION     },
  
      // Evented methods
      {   "subscribe",            byRef (&doSubscribe),           Role::USER,  NO_CONDITION     },
      {   "unsubscribe",          byRef (&doUnsubscribe),         Role::USER,  NO_CONDITION     },
  };
  
  class HandlerTable {
    private:
      template<std::size_t N>
      explicit
      HandlerTable (const Handler(&entries)[N])
      {
          for (std::size_t i = 0; i < N; ++i)
          {
              auto const& entry = entries[i];
              assert (table_.find(entry.name_) == table_.end());
              table_[entry.name_] = entry;
          }
  
          // This is where the new-style handlers are added.
          addHandler<LedgerHandler>();
          addHandler<VersionHandler>();
      }
  
    public:
      static HandlerTable const& instance()
      {
          static HandlerTable const handlerTable (handlerArray);
          return handlerTable;
      }
  
      Handler const* getHandler(std::string name) const
      {
          auto i = table_.find(name);
          return i == table_.end() ? nullptr : &i->second;
      }
  
      std::vector<char const*>
      getHandlerNames() const
      {
          std::vector<char const*> ret;
          ret.reserve(table_.size());
          for (auto const& i : table_)
              ret.push_back(i.second.name_);
          return ret;
      }
  
    private:
      std::map<std::string, Handler> table_;
  
      template <class HandlerImpl>
      void addHandler()
      {
          assert (table_.find(HandlerImpl::name()) == table_.end());
  
          Handler h;
          h.name_ = HandlerImpl::name();
          h.valueMethod_ = &handle<Json::Value, HandlerImpl>;
          h.role_ = HandlerImpl::role();
          h.condition_ = HandlerImpl::condition();
  
          table_[HandlerImpl::name()] = h;
      }
  };
  
  } // namespace
  
  Handler const* getHandler(std::string const& name)
  {
      return HandlerTable::instance().getHandler(name);
  }
  
  std::vector<char const*>
  getHandlerNames()
  {
      return HandlerTable::instance().getHandlerNames();
  };
  
  } // RPC
  } // blocmatrix
  