text: //------------------------------------------------------------------------------
  /*
      This file is part of MUSO: https://github.com/MUSO/MUSO
      Copyright (c) 2012, 2013 MUSO 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 <MUSO/basics/Log.h>
  #include <MUSO/basics/StringUtilities.h>
  #include <MUSO/basics/contract.h>
  #include <MUSO/json/to_string.h>
  #include <MUSO/net/RPCCall.h>
  #include <MUSO/net/RPCSub.h>
  #include <deque>
  
  namespace MUSO {
  
  // Subscription object for JSON-RPC
  class RPCSubImp : public RPCSub
  {
  public:
      RPCSubImp(
          InfoSub::Source& source,
          boost::asio::io_service& io_service,
          JobQueue& jobQueue,
          std::string const& strUrl,
          std::string const& strUsername,
          std::string const& strPassword,
          Logs& logs)
          : RPCSub(source)
          , m_io_service(io_service)
          , m_jobQueue(jobQueue)
          , mUrl(strUrl)
          , mSSL(false)
          , mUsername(strUsername)
          , mPassword(strPassword)
          , mSending(false)
          , j_(logs.journal("RPCSub"))
          , logs_(logs)
      {
          parsedURL pUrl;
  
          if (!parseUrl(pUrl, strUrl))
              Throw<std::runtime_error>("Failed to parse url.");
          else if (pUrl.scheme == "https")
              mSSL = true;
          else if (pUrl.scheme != "http")
              Throw<std::runtime_error>("Only http and https is supported.");
  
          mSeq = 1;
  
          mIp = pUrl.domain;
          mPort = (!pUrl.port) ? (mSSL ? 443 : 80) : *pUrl.port;
          mPath = pUrl.path;
  
          JLOG(j_.info()) << "RPCCall::fromNetwork sub: ip=" << mIp
                          << " port=" << mPort
                          << " ssl= " << (mSSL ? "yes" : "no") << " path='"
                          << mPath << "'";
      }
  
      ~RPCSubImp() = default;
  
      void
      send(Json::Value const& jvObj, bool broadcast) override
      {
          std::lock_guard sl(mLock);
  
          if (mDeque.size() >= eventQueueMax)
          {
              // Drop the previous event.
              JLOG(j_.warn()) << "RPCCall::fromNetwork drop";
              mDeque.pop_back();
          }
  
          auto jm = broadcast ? j_.debug() : j_.info();
          JLOG(jm) << "RPCCall::fromNetwork push: " << jvObj;
  
          mDeque.push_back(std::make_pair(mSeq++, jvObj));
  
          if (!mSending)
          {
              // Start a sending thread.
              JLOG(j_.info()) << "RPCCall::fromNetwork start";
  
              mSending = m_jobQueue.addJob(
                  jtCLIENT, "RPCSub::sendThread", [this](Job&) { sendThread(); });
          }
      }
  
      void
      setUsername(std::string const& strUsername) override
      {
          std::lock_guard sl(mLock);
  
          mUsername = strUsername;
      }
  
      void
      setPassword(std::string const& strPassword) override
      {
          std::lock_guard sl(mLock);
  
          mPassword = strPassword;
      }
  
  private:
      // XXX Could probably create a bunch of send jobs in a single get of the
      // lock.
      void
      sendThread()
      {
          Json::Value jvEvent;
          bool bSend;
  
          do
          {
              {
                  // Obtain the lock to manipulate the queue and change sending.
                  std::lock_guard sl(mLock);
  
                  if (mDeque.empty())
                  {
                      mSending = false;
                      bSend = false;
                  }
                  else
                  {
                      auto const [seq, env] = mDeque.front();
  
                      mDeque.pop_front();
  
                      jvEvent = env;
                      jvEvent["seq"] = seq;
  
                      bSend = true;
                  }
              }
  
              // Send outside of the lock.
              if (bSend)
              {
                  // XXX Might not need this in a try.
                  try
                  {
                      JLOG(j_.info()) << "RPCCall::fromNetwork: " << mIp;
  
                      RPCCall::fromNetwork(
                          m_io_service,
                          mIp,
                          mPort,
                          mUsername,
                          mPassword,
                          mPath,
                          "event",
                          jvEvent,
                          mSSL,
                          true,
                          logs_);
                  }
                  catch (const std::exception& e)
                  {
                      JLOG(j_.info())
                          << "RPCCall::fromNetwork exception: " << e.what();
                  }
              }
          } while (bSend);
      }
  
  private:
      enum { eventQueueMax = 32 };
  
      boost::asio::io_service& m_io_service;
      JobQueue& m_jobQueue;
  
      std::string mUrl;
      std::string mIp;
      std::uint16_t mPort;
      bool mSSL;
      std::string mUsername;
      std::string mPassword;
      std::string mPath;
  
      int mSeq;  // Next id to allocate.
  
      bool mSending;  // Sending threead is active.
  
      std::deque<std::pair<int, Json::Value>> mDeque;
  
      beast::Journal const j_;
      Logs& logs_;
  };
  
  //------------------------------------------------------------------------------
  
  RPCSub::RPCSub(InfoSub::Source& source) : InfoSub(source, Consumer())
  {
  }
  
  std::shared_ptr<RPCSub>
  make_RPCSub(
      InfoSub::Source& source,
      boost::asio::io_service& io_service,
      JobQueue& jobQueue,
      std::string const& strUrl,
      std::string const& strUsername,
      std::string const& strPassword,
      Logs& logs)
  {
      return std::make_shared<RPCSubImp>(
          std::ref(source),
          std::ref(io_service),
          std::ref(jobQueue),
          strUrl,
          strUsername,
          strPassword,
          logs);
  }
  
  }  // namespace MUSO
  