FairMQDevice.h

/********************************************************************************
 * Copyright (C) 2012-2018 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
 *                                                                              *
 *              This software is distributed under the terms of the             *
 *              GNU Lesser General Public Licence (LGPL) version 3,             *
 *                  copied verbatim in the file "LICENSE"                       *
 ********************************************************************************/

#ifndef FAIRMQDEVICE_H_
#define FAIRMQDEVICE_H_

#include <FairMQStateMachine.h>
#include <FairMQTransportFactory.h>
#include <fairmq/Transports.h>

#include <FairMQSocket.h>
#include <FairMQChannel.h>
#include <FairMQMessage.h>
#include <FairMQParts.h>
#include <FairMQUnmanagedRegion.h>
#include <FairMQLogger.h>
#include <options/FairMQProgOptions.h>

#include <vector>
#include <memory> // unique_ptr
#include <algorithm> // std::sort()
#include <string>
#include <chrono>
#include <iostream>
#include <unordered_map>
#include <functional>
#include <assert.h> // static_assert
#include <type_traits> // is_trivially_copyable
#include <stdexcept>

#include <mutex>
#include <condition_variable>

#include <fairmq/Tools.h>

using FairMQChannelMap = std::unordered_map<std::string, std::vector<FairMQChannel>>;

using InputMsgCallback = std::function<bool(FairMQMessagePtr&, int)>;
using InputMultipartCallback = std::function<bool(FairMQParts&, int)>;

class FairMQDevice : public FairMQStateMachine
{
    friend class FairMQChannel;

  public:
    FairMQDevice();
    FairMQDevice(FairMQProgOptions& config);

    FairMQDevice(const fair::mq::tools::Version version);

    FairMQDevice(FairMQProgOptions& config, const fair::mq::tools::Version version);

  private:
    FairMQDevice(FairMQProgOptions* config, const fair::mq::tools::Version version);

  public:
    FairMQDevice(const FairMQDevice&) = delete;
    FairMQDevice operator=(const FairMQDevice&) = delete;
    virtual ~FairMQDevice();

    void CatchSignals();

    virtual void LogSocketRates();

    void SortChannel(const std::string& name, const bool reindex = true);

    template<typename Serializer, typename DataType, typename... Args>
    void Serialize(FairMQMessage& msg, DataType&& data, Args&&... args) const
    {
        Serializer().Serialize(msg, std::forward<DataType>(data), std::forward<Args>(args)...);
    }

    template<typename Deserializer, typename DataType, typename... Args>
    void Deserialize(FairMQMessage& msg, DataType&& data, Args&&... args) const
    {
        Deserializer().Deserialize(msg, std::forward<DataType>(data), std::forward<Args>(args)...);
    }

    int Send(FairMQMessagePtr& msg, const std::string& channel, const int index = 0, int sndTimeoutInMs = -1)
    {
        return GetChannel(channel, index).Send(msg, sndTimeoutInMs);
    }

    int Receive(FairMQMessagePtr& msg, const std::string& channel, const int index = 0, int rcvTimeoutInMs = -1)
    {
        return GetChannel(channel, index).Receive(msg, rcvTimeoutInMs);
    }

    int SendAsync(FairMQMessagePtr& msg, const std::string& channel, const int index = 0) __attribute__((deprecated("For non-blocking Send, use timeout version with timeout of 0: Send(msg, \"channelA\", subchannelIndex, timeout);")))
    {
        return GetChannel(channel, index).Send(msg, 0);
    }
    int ReceiveAsync(FairMQMessagePtr& msg, const std::string& channel, const int index = 0) __attribute__((deprecated("For non-blocking Receive, use timeout version with timeout of 0: Receive(msg, \"channelA\", subchannelIndex, timeout);")))
    {
        return GetChannel(channel, index).Receive(msg, 0);
    }

    int64_t Send(FairMQParts& parts, const std::string& channel, const int index = 0, int sndTimeoutInMs = -1)
    {
        return GetChannel(channel, index).Send(parts.fParts, sndTimeoutInMs);
    }

    int64_t Receive(FairMQParts& parts, const std::string& channel, const int index = 0, int rcvTimeoutInMs = -1)
    {
        return GetChannel(channel, index).Receive(parts.fParts, rcvTimeoutInMs);
    }

    int64_t SendAsync(FairMQParts& parts, const std::string& channel, const int index = 0) __attribute__((deprecated("For non-blocking Send, use timeout version with timeout of 0: Send(parts, \"channelA\", subchannelIndex, timeout);")))
    {
        return GetChannel(channel, index).Send(parts.fParts, 0);
    }
    int64_t ReceiveAsync(FairMQParts& parts, const std::string& channel, const int index = 0) __attribute__((deprecated("For non-blocking Receive, use timeout version with timeout of 0: Receive(parts, \"channelA\", subchannelIndex, timeout);")))
    {
        return GetChannel(channel, index).Receive(parts.fParts, 0);
    }

    auto Transport() const -> FairMQTransportFactory*
    {
        return fTransportFactory.get();
    }

    template<typename... Args>
    FairMQMessagePtr NewMessage(Args&&... args)
    {
        return Transport()->CreateMessage(std::forward<Args>(args)...);
    }

    template<typename... Args>
    FairMQMessagePtr NewMessageFor(const std::string& channel, int index, Args&&... args)
    {
        return GetChannel(channel, index).NewMessage(std::forward<Args>(args)...);
    }

    template<typename T>
    FairMQMessagePtr NewStaticMessage(const T& data)
    {
        return Transport()->NewStaticMessage(data);
    }

    template<typename T>
    FairMQMessagePtr NewStaticMessageFor(const std::string& channel, int index, const T& data)
    {
        return GetChannel(channel, index).NewStaticMessage(data);
    }

    template<typename T>
    FairMQMessagePtr NewSimpleMessage(const T& data)
    {
        return Transport()->NewSimpleMessage(data);
    }

    template<typename T>
    FairMQMessagePtr NewSimpleMessageFor(const std::string& channel, int index, const T& data)
    {
        return GetChannel(channel, index).NewSimpleMessage(data);
    }

    FairMQUnmanagedRegionPtr NewUnmanagedRegion(const size_t size)
    {
        return Transport()->CreateUnmanagedRegion(size);
    }

    FairMQUnmanagedRegionPtr NewUnmanagedRegionFor(const std::string& channel, int index, const size_t size, FairMQRegionCallback callback = nullptr)
    {
        return GetChannel(channel, index).Transport()->CreateUnmanagedRegion(size, callback);
    }

    template<typename ...Ts>
    FairMQPollerPtr NewPoller(const Ts&... inputs)
    {
        std::vector<std::string> chans{inputs...};

        // if more than one channel provided, check compatibility
        if (chans.size() > 1)
        {
            fair::mq::Transport type = GetChannel(chans.at(0), 0).Transport()->GetType();

            for (unsigned int i = 1; i < chans.size(); ++i)
            {
                if (type != GetChannel(chans.at(i), 0).Transport()->GetType())
                {
                    LOG(error) << "poller failed: different transports within same poller are not yet supported. Going to ERROR state.";
                    throw std::runtime_error("poller failed: different transports within same poller are not yet supported.");
                }
            }
        }

        return GetChannel(chans.at(0), 0).Transport()->CreatePoller(fChannels, chans);
    }

    FairMQPollerPtr NewPoller(const std::vector<FairMQChannel*>& channels)
    {
        // if more than one channel provided, check compatibility
        if (channels.size() > 1)
        {
            fair::mq::Transport type = channels.at(0)->Transport()->GetType();

            for (unsigned int i = 1; i < channels.size(); ++i)
            {
                if (type != channels.at(i)->Transport()->GetType())
                {
                    LOG(error) << "poller failed: different transports within same poller are not yet supported. Going to ERROR state.";
                    throw std::runtime_error("poller failed: different transports within same poller are not yet supported.");
                }
            }
        }

        return channels.at(0)->Transport()->CreatePoller(channels);
    }

    void WaitForInitialValidation() __attribute__((deprecated("This method will have no effect in future versions and will be removed. Instead subscribe for state changes and inspect configuration values."))) {}

    std::shared_ptr<FairMQTransportFactory> AddTransport(const fair::mq::Transport transport);

    void SetConfig(FairMQProgOptions& config);
    FairMQProgOptions* GetConfig() const
    {
        return fConfig;
    }

    static bool SortSocketsByAddress(const FairMQChannel &lhs, const FairMQChannel &rhs);

    // overload to easily bind member functions
    template<typename T>
    void OnData(const std::string& channelName, bool (T::* memberFunction)(FairMQMessagePtr& msg, int index))
    {
        fDataCallbacks = true;
        fMsgInputs.insert(std::make_pair(channelName, [this, memberFunction](FairMQMessagePtr& msg, int index)
        {
            return (static_cast<T*>(this)->*memberFunction)(msg, index);
        }));

        if (find(fInputChannelKeys.begin(), fInputChannelKeys.end(), channelName) == fInputChannelKeys.end())
        {
            fInputChannelKeys.push_back(channelName);
        }
    }

    void OnData(const std::string& channelName, InputMsgCallback callback)
    {
        fDataCallbacks = true;
        fMsgInputs.insert(make_pair(channelName, callback));

        if (find(fInputChannelKeys.begin(), fInputChannelKeys.end(), channelName) == fInputChannelKeys.end())
        {
            fInputChannelKeys.push_back(channelName);
        }
    }

    // overload to easily bind member functions
    template<typename T>
    void OnData(const std::string& channelName, bool (T::* memberFunction)(FairMQParts& parts, int index))
    {
        fDataCallbacks = true;
        fMultipartInputs.insert(std::make_pair(channelName, [this, memberFunction](FairMQParts& parts, int index)
        {
            return (static_cast<T*>(this)->*memberFunction)(parts, index);
        }));

        if (find(fInputChannelKeys.begin(), fInputChannelKeys.end(), channelName) == fInputChannelKeys.end())
        {
            fInputChannelKeys.push_back(channelName);
        }
    }

    void OnData(const std::string& channelName, InputMultipartCallback callback)
    {
        fDataCallbacks = true;
        fMultipartInputs.insert(make_pair(channelName, callback));

        if (find(fInputChannelKeys.begin(), fInputChannelKeys.end(), channelName) == fInputChannelKeys.end())
        {
            fInputChannelKeys.push_back(channelName);
        }
    }

    FairMQChannel& GetChannel(const std::string& channelName, const int index = 0)
    try {
        return fChannels.at(channelName).at(index);
    } catch (const std::out_of_range& oor) {
        LOG(error) << "out of range: " << oor.what();
        LOG(error) << "requested channel has not been configured? check channel names/configuration.";
        fRateLogging = false;
        throw;
    }

    virtual void RegisterChannelEndpoints() {}

    bool RegisterChannelEndpoint(const std::string& channelName, uint16_t minNumSubChannels = 1, uint16_t maxNumSubChannels = 1)
    {
        bool ok = fChannelRegistry.insert(std::make_pair(channelName, std::make_pair(minNumSubChannels, maxNumSubChannels))).second;
        if (!ok)
        {
            LOG(warn) << "Registering channel: name already registered: \"" << channelName << "\"";
        }
        return ok;
    }

    void PrintRegisteredChannels()
    {
        if (fChannelRegistry.size() < 1)
        {
            std::cout << "no channels registered." << std::endl;
        }
        else
        {
            for (const auto& c : fChannelRegistry)
            {
                std::cout << c.first << ":" << c.second.first << ":" << c.second.second << std::endl;
            }
        }
    }

    void SetId(const std::string& id) { fId = id; }
    std::string GetId() { return fId; }

    const fair::mq::tools::Version GetVersion() const { return fVersion; }

    void SetNumIoThreads(int numIoThreads) { fConfig->SetValue<int>("io-threads", numIoThreads);}
    int GetNumIoThreads() const { return fConfig->GetValue<int>("io-threads"); }

    void SetNetworkInterface(const std::string& networkInterface) { fConfig->SetValue<std::string>("network-interface", networkInterface); }
    std::string GetNetworkInterface() const { return fConfig->GetValue<std::string>("network-interface"); }

    void SetDefaultTransport(const std::string& name) { fConfig->SetValue<std::string>("transport", name); }
    std::string GetDefaultTransport() const { return fConfig->GetValue<std::string>("transport"); }

    void SetInitializationTimeoutInS(int initializationTimeoutInS) { fConfig->SetValue<int>("initialization-timeout", initializationTimeoutInS); }
    int GetInitializationTimeoutInS() const { return fConfig->GetValue<int>("initialization-timeout"); }

    void SetTransport(const std::string& transport) { fConfig->SetValue<std::string>("transport", transport); }
    std::string GetTransportName() const { return fConfig->GetValue<std::string>("transport"); }

    void SetRawCmdLineArgs(const std::vector<std::string>& args) { fRawCmdLineArgs = args; }
    std::vector<std::string> GetRawCmdLineArgs() const { return fRawCmdLineArgs; }

    void RunStateMachine()
    {
      CallStateChangeCallbacks(FairMQStateMachine::IDLE);
      ProcessWork();
    };

    template<class Rep, class Period>
    bool WaitFor(std::chrono::duration<Rep, Period> const& duration)
    {
        std::unique_lock<std::mutex> lock(fInterruptedMtx);
        return !fInterruptedCV.wait_for(lock, duration, [&] { return fInterrupted.load(); }); // return true if no interruption happened
    }

  protected:
    std::shared_ptr<FairMQTransportFactory> fTransportFactory; 
    std::unordered_map<fair::mq::Transport, std::shared_ptr<FairMQTransportFactory>> fTransports; 

  public:
    std::unordered_map<std::string, std::vector<FairMQChannel>> fChannels; 
    std::unique_ptr<FairMQProgOptions> fInternalConfig; 
    FairMQProgOptions* fConfig; 

    void AddChannel(const std::string& channelName, const FairMQChannel& channel)
    {
        fConfig->AddChannel(channelName, channel);
    }

  protected:
    std::string fId; 

    virtual void Init();

    virtual void InitTask();

    virtual void Run();

    virtual void PreRun();

    virtual bool ConditionalRun();

    virtual void PostRun();

    virtual void Pause();

    virtual void ResetTask();

    virtual void Reset();

  private:
    fair::mq::Transport fDefaultTransportType; 

    void InitWrapper();
    void InitTaskWrapper();
    void RunWrapper();
    void PauseWrapper();
    void ResetTaskWrapper();
    void ResetWrapper();

    void Unblock();

    void Exit();

    void AttachChannels(std::vector<FairMQChannel*>& chans);
    bool AttachChannel(FairMQChannel& ch);

    void HandleSingleChannelInput();
    void HandleMultipleChannelInput();
    void HandleMultipleTransportInput();
    void PollForTransport(const FairMQTransportFactory* factory, const std::vector<std::string>& channelKeys);

    bool HandleMsgInput(const std::string& chName, const InputMsgCallback& callback, int i);
    bool HandleMultipartInput(const std::string& chName, const InputMultipartCallback& callback, int i);

    void CreateOwnConfig();

    bool fDataCallbacks;
    std::unordered_map<std::string, InputMsgCallback> fMsgInputs;
    std::unordered_map<std::string, InputMultipartCallback> fMultipartInputs;
    std::unordered_map<fair::mq::Transport, std::vector<std::string>> fMultitransportInputs;
    std::unordered_map<std::string, std::pair<uint16_t, uint16_t>> fChannelRegistry;
    std::vector<std::string> fInputChannelKeys;
    std::mutex fMultitransportMutex;
    std::atomic<bool> fMultitransportProceed;

    const fair::mq::tools::Version fVersion;
    float fRate; 
    std::vector<std::string> fRawCmdLineArgs;

    std::atomic<bool> fInterrupted;
    std::condition_variable fInterruptedCV;
    std::mutex fInterruptedMtx;
    mutable std::atomic<bool> fRateLogging;
};

#endif /* FAIRMQDEVICE_H_ */