FedRawDataInputSource.cc

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#include <fcntl.h>
#include <iomanip>
#include <iostream>
#include <memory>
#include <sstream>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/time.h>
#include <unistd.h>
#include <vector>
#include <fstream>
#include <zlib.h>
#include <stdio.h>
#include <chrono>

#include <boost/algorithm/string.hpp>
#include <boost/filesystem/fstream.hpp>


#include "DataFormats/FEDRawData/interface/FEDNumbering.h"
#include "DataFormats/FEDRawData/interface/FEDRawDataCollection.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/InputSourceDescription.h"
#include "FWCore/Framework/interface/InputSourceMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/UnixSignalHandlers.h"

#include "EventFilter/FEDInterface/interface/GlobalEventNumber.h"
#include "EventFilter/FEDInterface/interface/fed_header.h"
#include "EventFilter/FEDInterface/interface/fed_trailer.h"

#include "EventFilter/Utilities/interface/FedRawDataInputSource.h"

#include "EventFilter/Utilities/interface/FastMonitoringService.h"
#include "EventFilter/Utilities/interface/DataPointDefinition.h"
#include "EventFilter/Utilities/interface/FFFNamingSchema.h"

#include "EventFilter/Utilities/interface/AuxiliaryMakers.h"

#include "DataFormats/Provenance/interface/EventAuxiliary.h"
#include "DataFormats/Provenance/interface/EventID.h"
#include "DataFormats/Provenance/interface/Timestamp.h"
#include "EventFilter/Utilities/interface/crc32c.h"

//JSON file reader
#include "EventFilter/Utilities/interface/reader.h"

#include <boost/lexical_cast.hpp>

using namespace jsoncollector;

FedRawDataInputSource::FedRawDataInputSource(edm::ParameterSet const& pset,
                                             edm::InputSourceDescription const& desc) :
  edm::RawInputSource(pset, desc),
  defPath_(pset.getUntrackedParameter<std::string> ("buDefPath", std::string(getenv("CMSSW_BASE"))+"/src/EventFilter/Utilities/plugins/budef.jsd")),
  eventChunkSize_(pset.getUntrackedParameter<unsigned int> ("eventChunkSize",32)*1048576),
  eventChunkBlock_(pset.getUntrackedParameter<unsigned int> ("eventChunkBlock",32)*1048576),
  numBuffers_(pset.getUntrackedParameter<unsigned int> ("numBuffers",2)),
  maxBufferedFiles_(pset.getUntrackedParameter<unsigned int> ("maxBufferedFiles",2)),
  getLSFromFilename_(pset.getUntrackedParameter<bool> ("getLSFromFilename", true)),
  verifyAdler32_(pset.getUntrackedParameter<bool> ("verifyAdler32", true)),
  verifyChecksum_(pset.getUntrackedParameter<bool> ("verifyChecksum", true)),
  useL1EventID_(pset.getUntrackedParameter<bool> ("useL1EventID", false)),
  fileNames_(pset.getUntrackedParameter<std::vector<std::string>> ("fileNames",std::vector<std::string>())),
  fileListMode_(pset.getUntrackedParameter<bool> ("fileListMode", false)),
  runNumber_(edm::Service<evf::EvFDaqDirector>()->getRunNumber()),
  fuOutputDir_(std::string()),
  daqProvenanceHelper_(edm::TypeID(typeid(FEDRawDataCollection))),
  eventID_(),
  processHistoryID_(),
  currentLumiSection_(0),
  tcds_pointer_(0),
  eventsThisLumi_(0),
  dpd_(nullptr)
{
  char thishost[256];
  gethostname(thishost, 255);
  edm::LogInfo("FedRawDataInputSource") << "Construction. read-ahead chunk size -: "
                                        << std::endl << (eventChunkSize_/1048576)
                                        << " MB on host " << thishost;

  long autoRunNumber = -1;
  if (fileListMode_)  {
    autoRunNumber = initFileList();
    if (autoRunNumber<0)
      throw cms::Exception("FedRawDataInputSource::FedRawDataInputSource") << "Run number not found from filename";
    //override run number
    runNumber_ = (edm::RunNumber_t)autoRunNumber;
    edm::Service<evf::EvFDaqDirector>()->overrideRunNumber((unsigned int)autoRunNumber);
  }

  processHistoryID_ = daqProvenanceHelper_.daqInit(productRegistryUpdate(), processHistoryRegistryForUpdate());
  setNewRun();
  //todo:autodetect from file name (assert if names differ)
  setRunAuxiliary(new edm::RunAuxiliary(runNumber_, edm::Timestamp::beginOfTime(),
                    edm::Timestamp::invalidTimestamp()));

  std::string defPathSuffix = "src/EventFilter/Utilities/plugins/budef.jsd";
  defPath_ = std::string(getenv("CMSSW_BASE")) + "/" + defPathSuffix;
  struct stat statbuf;
  if (stat(defPath_.c_str(), &statbuf)) {
    defPath_ = std::string(getenv("CMSSW_RELEASE_BASE")) + "/" + defPathSuffix;
    if (stat(defPath_.c_str(), &statbuf)) {
      defPath_ = defPathSuffix;
    }
  }

  dpd_ = new DataPointDefinition();
  std::string defLabel = "data";
  DataPointDefinition::getDataPointDefinitionFor(defPath_, dpd_,&defLabel);

  //make sure that chunk size is N * block size
  assert(eventChunkSize_>=eventChunkBlock_);
  readBlocks_ = eventChunkSize_/eventChunkBlock_;
  if (readBlocks_*eventChunkBlock_ != eventChunkSize_)
    eventChunkSize_=readBlocks_*eventChunkBlock_;

  if (!numBuffers_)
    throw cms::Exception("FedRawDataInputSource::FedRawDataInputSource") <<
               "no reading enabled with numBuffers parameter 0";

  numConcurrentReads_=numBuffers_-1;
  singleBufferMode_ = !(numBuffers_>1);
  readingFilesCount_=0;

  if (!crc32c_hw_test())
    edm::LogError("FedRawDataInputSource::FedRawDataInputSource") << "Intel crc32c checksum computation unavailable";

  //get handles to DaqDirector and FastMonitoringService because getting them isn't possible in readSupervisor thread
  if (fileListMode_) {
    try {
      fms_ = static_cast<evf::FastMonitoringService *> (edm::Service<evf::MicroStateService>().operator->());
    } catch(...) {}
  }
  else {
    fms_ = static_cast<evf::FastMonitoringService *> (edm::Service<evf::MicroStateService>().operator->());
    if (!fms_) {
      throw cms::Exception("FedRawDataInputSource") << "FastMonitoringService not found";
    }
  }

  daqDirector_ = edm::Service<evf::EvFDaqDirector>().operator->();
  if (!daqDirector_)
    cms::Exception("FedRawDataInputSource") << "EvFDaqDirector not found";

  //set DaqDirector to delete files in preGlobalEndLumi callback
  daqDirector_->setDeleteTracking(&fileDeleteLock_,&filesToDelete_);
  if (fms_) {
   daqDirector_->setFMS(fms_);
   fms_->setInputSource(this);
  }
  //should delete chunks when run stops
  for (unsigned int i=0;i<numBuffers_;i++) {
    freeChunks_.push(new InputChunk(i,eventChunkSize_));
  }

  quit_threads_ = false;

  for (unsigned int i=0;i<numConcurrentReads_;i++)
  {
    std::unique_lock<std::mutex> lk(startupLock_);
    //issue a memory fence here and in threads (constructor was segfaulting without this)
    thread_quit_signal.push_back(false);
    workerJob_.push_back(ReaderInfo(nullptr,nullptr));
    cvReader_.push_back(new std::condition_variable);
    threadInit_.store(false,std::memory_order_release);
    workerThreads_.push_back(new std::thread(&FedRawDataInputSource::readWorker,this,i));
    startupCv_.wait(lk);
  }

  runAuxiliary()->setProcessHistoryID(processHistoryID_);
}

FedRawDataInputSource::~FedRawDataInputSource()
{
  quit_threads_=true;

  //delete any remaining open files
  for (auto it = filesToDelete_.begin();it!=filesToDelete_.end();it++) {
    deleteFile(it->second->fileName_);
    delete it->second;
  }
  if (startedSupervisorThread_) {
    readSupervisorThread_->join();
  }
  else {
    //join aux threads in case the supervisor thread was not started
    for (unsigned int i=0;i<workerThreads_.size();i++) {
      std::unique_lock<std::mutex> lk(mReader_);
      thread_quit_signal[i]=true;
      cvReader_[i]->notify_one();
      lk.unlock();
      workerThreads_[i]->join();
      delete workerThreads_[i];
    }
  }
  for (unsigned int i=0;i<numConcurrentReads_;i++) delete cvReader_[i];
  /*
  for (unsigned int i=0;i<numConcurrentReads_+1;i++) {
    InputChunk *ch;
    while (!freeChunks_.try_pop(ch)) {}
    delete ch;
  }
  */
}

void FedRawDataInputSource::fillDescriptions(edm::ConfigurationDescriptions& descriptions)
{
  edm::ParameterSetDescription desc;
  desc.setComment("File-based Filter Farm input source for reading raw data from BU ramdisk");
  desc.addUntracked<unsigned int> ("eventChunkSize",32)->setComment("Input buffer (chunk) size");
  desc.addUntracked<unsigned int> ("eventChunkBlock",32)->setComment("Block size used in a single file read call (must be smaller or equal to buffer size)");
  desc.addUntracked<unsigned int> ("numBuffers",2)->setComment("Number of buffers used for reading input");
  desc.addUntracked<unsigned int> ("maxBufferedFiles",2)->setComment("Maximum number of simultaneously buffered raw files");
  desc.addUntracked<bool> ("verifyAdler32", true)->setComment("Verify event Adler32 checksum with FRDv3 or v4");
  desc.addUntracked<bool> ("verifyChecksum", true)->setComment("Verify event CRC-32C checksum of FRDv5 or higher");
  desc.addUntracked<bool> ("useL1EventID", false)->setComment("Use L1 event ID from FED header if true or from TCDS FED if false");
  desc.addUntracked<bool> ("fileListMode", false)->setComment("Use fileNames parameter to directly specify raw files to open");
  desc.addUntracked<std::vector<std::string>> ("fileNames", std::vector<std::string>())->setComment("file list used when fileListMode is enabled");
  desc.setAllowAnything();
  descriptions.add("source", desc);
}

bool FedRawDataInputSource::checkNextEvent()
{
  if (!startedSupervisorThread_)
  {
    //late init of directory variable
    fuOutputDir_=edm::Service<evf::EvFDaqDirector>()->baseRunDir();

    //this thread opens new files and dispatches reading to worker readers
    //threadInit_.store(false,std::memory_order_release);
    std::unique_lock<std::mutex> lk(startupLock_);
    readSupervisorThread_.reset(new std::thread(&FedRawDataInputSource::readSupervisor,this));
    startedSupervisorThread_=true;
    startupCv_.wait(lk);
  }
  //signal hltd to start event accounting
  if (!currentLumiSection_ && daqDirector_->emptyLumisectionMode())
    daqDirector_->createProcessingNotificationMaybe();

  switch (nextEvent() ) {
    case evf::EvFDaqDirector::runEnded: {

      //maybe create EoL file in working directory before ending run
      struct stat buf;
      if ( currentLumiSection_ > 0) {
        bool eolFound = (stat(daqDirector_->getEoLSFilePathOnBU(currentLumiSection_).c_str(), &buf) == 0);
        if (eolFound) {
          const std::string fuEoLS = daqDirector_->getEoLSFilePathOnFU(currentLumiSection_);
          bool found = (stat(fuEoLS.c_str(), &buf) == 0);
          if ( !found ) {
            daqDirector_->lockFULocal2();
            int eol_fd = open(fuEoLS.c_str(), O_RDWR|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
            close(eol_fd);
            daqDirector_->unlockFULocal2();
          }
        }
      }
      //also create EoR file in FU data directory
      bool eorFound =  (stat(daqDirector_->getEoRFilePathOnFU().c_str(),&buf) == 0);
      if (!eorFound) {
        int eor_fd = open(daqDirector_->getEoRFilePathOnFU().c_str(), O_RDWR|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
        close(eor_fd);
      }
      reportEventsThisLumiInSource(currentLumiSection_,eventsThisLumi_);
      eventsThisLumi_=0;
      resetLuminosityBlockAuxiliary();
       edm::LogInfo("FedRawDataInputSource") << "----------------RUN ENDED----------------";
      return false;
    }
    case evf::EvFDaqDirector::noFile: {
      //this is not reachable
      return true;
    }
    case evf::EvFDaqDirector::newLumi: {
      //std::cout << "--------------NEW LUMI---------------" << std::endl;
      return true;
    }
    default: {
      if (!getLSFromFilename_) {
        //get new lumi from file header
    if (event_->lumi() > currentLumiSection_) {
          reportEventsThisLumiInSource(currentLumiSection_,eventsThisLumi_);
      eventsThisLumi_=0;
          maybeOpenNewLumiSection( event_->lumi() );
    }
      }
      eventRunNumber_=event_->run();
      L1EventID_ = event_->event();

      setEventCached();

      return true;
    }
  }
}

void FedRawDataInputSource::createBoLSFile(const uint32_t lumiSection, bool checkIfExists)
{
  //used for backpressure mechanisms and monitoring
  const std::string fuBoLS = daqDirector_->getBoLSFilePathOnFU(lumiSection);
  struct stat buf;
  if (checkIfExists==false || stat(fuBoLS.c_str(), &buf) != 0) {
    int bol_fd = open(fuBoLS.c_str(), O_RDWR|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
    close(bol_fd);
  }
}

void FedRawDataInputSource::maybeOpenNewLumiSection(const uint32_t lumiSection)
{
  if (!luminosityBlockAuxiliary()
    || luminosityBlockAuxiliary()->luminosityBlock() != lumiSection) {

    if ( currentLumiSection_ > 0) {
      const std::string fuEoLS =
        daqDirector_->getEoLSFilePathOnFU(currentLumiSection_);
      struct stat buf;
      bool found = (stat(fuEoLS.c_str(), &buf) == 0);
      if ( !found ) {
        daqDirector_->lockFULocal2();
        int eol_fd = open(fuEoLS.c_str(), O_RDWR|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
        close(eol_fd);
        createBoLSFile(lumiSection,false);
        daqDirector_->unlockFULocal2();
      }
    }
    else createBoLSFile(lumiSection,true);//needed for initial lumisection

    currentLumiSection_ = lumiSection;

    resetLuminosityBlockAuxiliary();

    timeval tv;
    gettimeofday(&tv, 0);
    const edm::Timestamp lsopentime( (unsigned long long) tv.tv_sec * 1000000 + (unsigned long long) tv.tv_usec );

    edm::LuminosityBlockAuxiliary* lumiBlockAuxiliary =
      new edm::LuminosityBlockAuxiliary(
        runAuxiliary()->run(),
        lumiSection, lsopentime,
        edm::Timestamp::invalidTimestamp());

    setLuminosityBlockAuxiliary(lumiBlockAuxiliary);
    luminosityBlockAuxiliary()->setProcessHistoryID(processHistoryID_);

    edm::LogInfo("FedRawDataInputSource") << "New lumi section was opened. LUMI -: "<< lumiSection;
  }
}

inline evf::EvFDaqDirector::FileStatus FedRawDataInputSource::nextEvent()
{
   evf::EvFDaqDirector::FileStatus status = evf::EvFDaqDirector::noFile;
   while ((status = getNextEvent())==evf::EvFDaqDirector::noFile)
   {
       if (edm::shutdown_flag.load(std::memory_order_relaxed)) break;
   }
   return status;
}

inline evf::EvFDaqDirector::FileStatus FedRawDataInputSource::getNextEvent()
{

  if (setExceptionState_) threadError();
  if (!currentFile_)
  {
    if (!streamFileTrackerPtr_) {
      streamFileTrackerPtr_ = daqDirector_->getStreamFileTracker();
      nStreams_ = streamFileTrackerPtr_->size();
      if (nStreams_>10) checkEvery_=nStreams_;
    }

    evf::EvFDaqDirector::FileStatus status = evf::EvFDaqDirector::noFile;
    if (!fileQueue_.try_pop(currentFile_))
    {
      //sleep until wakeup (only in single-buffer mode) or timeout
      std::unique_lock<std::mutex> lkw(mWakeup_);
      if (cvWakeup_.wait_for(lkw, std::chrono::milliseconds(100)) == std::cv_status::timeout || !currentFile_)
        return evf::EvFDaqDirector::noFile;
    }
    status = currentFile_->status_;
    if ( status == evf::EvFDaqDirector::runEnded)
    {
      delete currentFile_;
      currentFile_=nullptr;
      return status;
    }
    else if ( status == evf::EvFDaqDirector::runAbort)
    {
      throw cms::Exception("FedRawDataInputSource::getNextEvent") << "Run has been aborted by the input source reader thread";
    }
    else if (status == evf::EvFDaqDirector::newLumi)
    {
      if (getLSFromFilename_) {
    if (currentFile_->lumi_ > currentLumiSection_) {
          reportEventsThisLumiInSource(currentLumiSection_,eventsThisLumi_);
      eventsThisLumi_=0;
          maybeOpenNewLumiSection(currentFile_->lumi_);
    }
      }
      else {//let this be picked up from next event
        status = evf::EvFDaqDirector::noFile;
      }

      delete currentFile_;
      currentFile_=nullptr;
      return status;
    }
    else if (status == evf::EvFDaqDirector::newFile) {
      currentFileIndex_++;
      daqDirector_->updateFileIndex(currentFileIndex_);
    }
    else
      assert(0);
  }

  //file is empty
  if (!currentFile_->fileSize_) {
    readingFilesCount_--;
    //try to open new lumi
    assert(currentFile_->nChunks_==0);
    if (getLSFromFilename_)
      if (currentFile_->lumi_ > currentLumiSection_) {
        reportEventsThisLumiInSource(currentLumiSection_,eventsThisLumi_);
    eventsThisLumi_=0;
        maybeOpenNewLumiSection(currentFile_->lumi_);
      }
    //immediately delete empty file
    deleteFile(currentFile_->fileName_);
    delete currentFile_;
    currentFile_=nullptr;
    return evf::EvFDaqDirector::noFile;
  }

  //file is finished
  if (currentFile_->bufferPosition_==currentFile_->fileSize_) {
    readingFilesCount_--;
    //release last chunk (it is never released elsewhere)
    freeChunks_.push(currentFile_->chunks_[currentFile_->currentChunk_]);
    if (currentFile_->nEvents_>=0 && currentFile_->nEvents_!=int(currentFile_->nProcessed_))
    {
      throw cms::Exception("FedRawDataInputSource::getNextEvent")
    << "Fully processed " << currentFile_->nProcessed_ 
        << " from the file " << currentFile_->fileName_ 
    << " but according to BU JSON there should be " 
    << currentFile_->nEvents_ << " events";
    }
    //try to wake up supervisor thread which might be sleeping waiting for the free chunk
    if (singleBufferMode_) {
      std::unique_lock<std::mutex> lkw(mWakeup_);
      cvWakeup_.notify_one();
    }
    bufferInputRead_=0;
    if (!daqDirector_->isSingleStreamThread()) {
      //put the file in pending delete list;
      std::unique_lock<std::mutex> lkw(fileDeleteLock_);
      filesToDelete_.push_back(std::pair<int,InputFile*>(currentFileIndex_,currentFile_));
    }
    else {
      //in single-thread and stream jobs, events are already processed
      deleteFile(currentFile_->fileName_);
      delete currentFile_;
    }
    currentFile_=nullptr;
    return evf::EvFDaqDirector::noFile;
  }


  //file is too short
  if (currentFile_->fileSize_ - currentFile_->bufferPosition_ < FRDHeaderVersionSize[detectedFRDversion_])
  {
    throw cms::Exception("FedRawDataInputSource::getNextEvent") <<
      "Premature end of input file while reading event header";
  }
  if (singleBufferMode_) {

    //should already be there
    while (!currentFile_->waitForChunk(currentFile_->currentChunk_)) {
      usleep(10000);
      if (currentFile_->parent_->exceptionState()) currentFile_->parent_->threadError();
    }

    unsigned char *dataPosition = currentFile_->chunks_[0]->buf_+ currentFile_->chunkPosition_;

    //conditions when read amount is not sufficient for the header to fit
    if (!bufferInputRead_ || bufferInputRead_ < FRDHeaderVersionSize[detectedFRDversion_]
       ||  eventChunkSize_ - currentFile_->chunkPosition_ < FRDHeaderVersionSize[detectedFRDversion_])
    {
      readNextChunkIntoBuffer(currentFile_);

      if (detectedFRDversion_==0) {
        detectedFRDversion_=*((uint32*)dataPosition);
        if (detectedFRDversion_>5) 
          throw cms::Exception("FedRawDataInputSource::getNextEvent")
              << "Unknown FRD version -: " << detectedFRDversion_;
        assert(detectedFRDversion_>=1);
      }

      //recalculate chunk position
      dataPosition = currentFile_->chunks_[0]->buf_+ currentFile_->chunkPosition_;
      if ( bufferInputRead_ < FRDHeaderVersionSize[detectedFRDversion_])
      {
      throw cms::Exception("FedRawDataInputSource::getNextEvent") <<
    "Premature end of input file while reading event header";
      }
    }

    event_.reset( new FRDEventMsgView(dataPosition) );
    if (event_->size()>eventChunkSize_) {
      throw cms::Exception("FedRawDataInputSource::getNextEvent")
          << " event id:"<< event_->event()<< " lumi:" << event_->lumi()
          << " run:" << event_->run() << " of size:" << event_->size()
          << " bytes does not fit into a chunk of size:" << eventChunkSize_ << " bytes";
    }

    const uint32_t msgSize = event_->size()-FRDHeaderVersionSize[detectedFRDversion_];

    if (currentFile_->fileSize_ - currentFile_->bufferPosition_ < msgSize)
    {
      throw cms::Exception("FedRawDataInputSource::getNextEvent") <<
    "Premature end of input file while reading event data";
    }
    if (eventChunkSize_ - currentFile_->chunkPosition_ < msgSize) {
      readNextChunkIntoBuffer(currentFile_);
      //recalculate chunk position
      dataPosition = currentFile_->chunks_[0]->buf_+ currentFile_->chunkPosition_;
      event_.reset( new FRDEventMsgView(dataPosition) );
    }
    currentFile_->bufferPosition_ += event_->size();
    currentFile_->chunkPosition_ += event_->size();
    //last chunk is released when this function is invoked next time

  }
  //multibuffer mode:
  else
  {
    //wait for the current chunk to become added to the vector
    while (!currentFile_->waitForChunk(currentFile_->currentChunk_)) {
      usleep(10000);
      if (setExceptionState_) threadError();
    }

    //check if header is at the boundary of two chunks
    chunkIsFree_ = false;
    unsigned char *dataPosition;

    //read header, copy it to a single chunk if necessary
    bool chunkEnd = currentFile_->advance(dataPosition,FRDHeaderVersionSize[detectedFRDversion_]);

    event_.reset( new FRDEventMsgView(dataPosition) );
    if (event_->size()>eventChunkSize_) {
      throw cms::Exception("FedRawDataInputSource::getNextEvent")
          << " event id:"<< event_->event()<< " lumi:" << event_->lumi()
          << " run:" << event_->run() << " of size:" << event_->size()
          << " bytes does not fit into a chunk of size:" << eventChunkSize_ << " bytes";
    }

    const uint32_t msgSize = event_->size()-FRDHeaderVersionSize[detectedFRDversion_];

    if (currentFile_->fileSize_ - currentFile_->bufferPosition_ < msgSize)
    {
      throw cms::Exception("FedRawDataInputSource::getNextEvent") <<
    "Premature end of input file while reading event data";
    }

    if (chunkEnd) {
      //header was at the chunk boundary, we will have to move payload as well
      currentFile_->moveToPreviousChunk(msgSize,FRDHeaderVersionSize[detectedFRDversion_]);
      chunkIsFree_ = true;
    }
    else {
      //header was contiguous, but check if payload fits the chunk
      if (eventChunkSize_ - currentFile_->chunkPosition_ < msgSize) {
    //rewind to header start position
    currentFile_->rewindChunk(FRDHeaderVersionSize[detectedFRDversion_]);
    //copy event to a chunk start and move pointers
    chunkEnd = currentFile_->advance(dataPosition,FRDHeaderVersionSize[detectedFRDversion_]+msgSize);
    assert(chunkEnd);
    chunkIsFree_=true;
    //header is moved
    event_.reset( new FRDEventMsgView(dataPosition) );
      }
      else {
    //everything is in a single chunk, only move pointers forward
    chunkEnd = currentFile_->advance(dataPosition,msgSize);
    assert(!chunkEnd);
    chunkIsFree_=false;
      }
    }
  }//end multibuffer mode

  if (verifyChecksum_ && event_->version() >= 5)
  {
    uint32_t crc=0;
    crc = crc32c(crc,(const unsigned char*)event_->payload(),event_->eventSize());
    if ( crc != event_->crc32c() ) {
      if (fms_) fms_->setExceptionDetected(currentLumiSection_);
      throw cms::Exception("FedRawDataInputSource::getNextEvent") <<
        "Found a wrong crc32c checksum: expected 0x" << std::hex << event_->crc32c() <<
        " but calculated 0x" << crc;
    }
  }
  else if ( verifyAdler32_ && event_->version() >= 3)
  {
    uint32_t adler = adler32(0L,Z_NULL,0);
    adler = adler32(adler,(Bytef*)event_->payload(),event_->eventSize());

    if ( adler != event_->adler32() ) {
      if (fms_) fms_->setExceptionDetected(currentLumiSection_);
      throw cms::Exception("FedRawDataInputSource::getNextEvent") <<
        "Found a wrong Adler32 checksum: expected 0x" << std::hex << event_->adler32() <<
        " but calculated 0x" << adler;
    }
  }


  currentFile_->nProcessed_++;

  return evf::EvFDaqDirector::sameFile;
}

void FedRawDataInputSource::deleteFile(std::string const& fileName)
{
  //no deletion in file list mode
  if (fileListMode_) return;

  const boost::filesystem::path filePath(fileName);
  LogDebug("FedRawDataInputSource") << "Deleting input file -:" << fileName;
  try {
    //sometimes this fails but file gets deleted
    boost::filesystem::remove(filePath);
  }
  catch (const boost::filesystem::filesystem_error& ex)
  {
    edm::LogError("FedRawDataInputSource") << " - deleteFile BOOST FILESYSTEM ERROR CAUGHT -: " << ex.what()
                                           << ". Trying again.";
    usleep(100000);
    try {
      boost::filesystem::remove(filePath);
    }
    catch (const boost::filesystem::filesystem_error&) {/*file gets deleted first time but exception is still thrown*/}
  }
  catch (std::exception& ex)
  {
    edm::LogError("FedRawDataInputSource") << " - deleteFile std::exception CAUGHT -: " << ex.what()
                                           << ". Trying again.";
    usleep(100000);
    try {
      boost::filesystem::remove(filePath);
    } catch (std::exception&) {/*file gets deleted first time but exception is still thrown*/}
  }
}


void FedRawDataInputSource::read(edm::EventPrincipal& eventPrincipal)
{
  std::unique_ptr<FEDRawDataCollection> rawData(new FEDRawDataCollection);
  edm::Timestamp tstamp = fillFEDRawDataCollection(*rawData);

  if (useL1EventID_){
    eventID_ = edm::EventID(eventRunNumber_, currentLumiSection_, L1EventID_);
    edm::EventAuxiliary aux(eventID_, processGUID(), tstamp, true,
                edm::EventAuxiliary::PhysicsTrigger);
    aux.setProcessHistoryID(processHistoryID_);
    makeEvent(eventPrincipal, aux);
  }
  else if(tcds_pointer_==0){
    assert(GTPEventID_);
    eventID_ = edm::EventID(eventRunNumber_, currentLumiSection_, GTPEventID_);
    edm::EventAuxiliary aux(eventID_, processGUID(), tstamp, true,
                edm::EventAuxiliary::PhysicsTrigger);
    aux.setProcessHistoryID(processHistoryID_);
    makeEvent(eventPrincipal, aux);
  }
  else{
    evf::evtn::TCDSRecord record((unsigned char *)(tcds_pointer_));
    edm::EventAuxiliary aux = evf::evtn::makeEventAuxiliary(&record,
                         eventRunNumber_,currentLumiSection_,
                                                 processGUID());
    aux.setProcessHistoryID(processHistoryID_);
    makeEvent(eventPrincipal, aux);
  }



  std::unique_ptr<edm::WrapperBase> edp(new edm::Wrapper<FEDRawDataCollection>(std::move(rawData)));

  //FWCore/Sources DaqProvenanceHelper before 7_1_0_pre3
  //eventPrincipal.put(daqProvenanceHelper_.constBranchDescription_, edp,
  //                   daqProvenanceHelper_.dummyProvenance_);

  eventPrincipal.put(daqProvenanceHelper_.branchDescription(), std::move(edp),
                     daqProvenanceHelper_.dummyProvenance());

  eventsThisLumi_++;

  //this old file check runs no more often than every 10 events
  if (!((currentFile_->nProcessed_-1)%(checkEvery_))) {
    //delete files that are not in processing
    std::unique_lock<std::mutex> lkw(fileDeleteLock_);
    auto it = filesToDelete_.begin();
    while (it!=filesToDelete_.end()) {
      bool fileIsBeingProcessed = false;
      for (unsigned int i=0;i<nStreams_;i++) {
    if (it->first == streamFileTrackerPtr_->at(i)) {
        fileIsBeingProcessed = true;
        break;
    }
      }
      if (!fileIsBeingProcessed) {
        deleteFile(it->second->fileName_);
        delete it->second;
    it = filesToDelete_.erase(it);
      }
      else it++;
    }

  }
  if (chunkIsFree_) freeChunks_.push(currentFile_->chunks_[currentFile_->currentChunk_-1]);
  chunkIsFree_=false;
  return;
}

edm::Timestamp FedRawDataInputSource::fillFEDRawDataCollection(FEDRawDataCollection& rawData)
{
  edm::TimeValue_t time;
  timeval stv;
  gettimeofday(&stv,0);
  time = stv.tv_sec;
  time = (time << 32) + stv.tv_usec;
  edm::Timestamp tstamp(time);

  uint32_t eventSize = event_->eventSize();
  char* event = (char*)event_->payload();
  GTPEventID_=0;
  tcds_pointer_ = 0;
  while (eventSize > 0) {
    assert(eventSize>=sizeof(fedt_t));
    eventSize -= sizeof(fedt_t);
    const fedt_t* fedTrailer = (fedt_t*) (event + eventSize);
    const uint32_t fedSize = FED_EVSZ_EXTRACT(fedTrailer->eventsize) << 3; //trailer length counts in 8 bytes
    assert(eventSize>=fedSize - sizeof(fedt_t));
    eventSize -= (fedSize - sizeof(fedt_t));
    const fedh_t* fedHeader = (fedh_t *) (event + eventSize);
    const uint16_t fedId = FED_SOID_EXTRACT(fedHeader->sourceid);
    if(fedId>FEDNumbering::MAXFEDID)
    {
      throw cms::Exception("FedRawDataInputSource::fillFEDRawDataCollection") << "Out of range FED ID : " << fedId;
    }
    if (fedId == FEDNumbering::MINTCDSuTCAFEDID) {
      tcds_pointer_ = (unsigned char *)(event + eventSize );
    }
    if (fedId == FEDNumbering::MINTriggerGTPFEDID) {
      if (evf::evtn::evm_board_sense((unsigned char*) fedHeader,fedSize))
          GTPEventID_ = evf::evtn::get((unsigned char*) fedHeader,true);
      else
          GTPEventID_ = evf::evtn::get((unsigned char*) fedHeader,false);
      //evf::evtn::evm_board_setformat(fedSize);
      const uint64_t gpsl = evf::evtn::getgpslow((unsigned char*) fedHeader);
      const uint64_t gpsh = evf::evtn::getgpshigh((unsigned char*) fedHeader);
      tstamp = edm::Timestamp(static_cast<edm::TimeValue_t> ((gpsh << 32) + gpsl));
    }
    //take event ID from GTPE FED
    if (fedId == FEDNumbering::MINTriggerEGTPFEDID && GTPEventID_==0) {
      if (evf::evtn::gtpe_board_sense((unsigned char*)fedHeader)) {
        GTPEventID_ = evf::evtn::gtpe_get((unsigned char*) fedHeader);
      }
    }
    FEDRawData& fedData = rawData.FEDData(fedId);
    fedData.resize(fedSize);
    memcpy(fedData.data(), event + eventSize, fedSize);
  }
  assert(eventSize == 0);

  return tstamp;
}

int FedRawDataInputSource::grabNextJsonFile(boost::filesystem::path const& jsonSourcePath)
{
  std::string data;
  try {
    // assemble json destination path
    boost::filesystem::path jsonDestPath(fuOutputDir_);

    //TODO:should be ported to use fffnaming
    std::ostringstream fileNameWithPID;
    fileNameWithPID << jsonSourcePath.stem().string() << "_pid"
                    << std::setfill('0') << std::setw(5) << getpid() << ".jsn";
    jsonDestPath /= fileNameWithPID.str();

    LogDebug("FedRawDataInputSource") << "JSON rename -: " << jsonSourcePath << " to "
                                          << jsonDestPath;
    try {
      boost::filesystem::copy(jsonSourcePath,jsonDestPath);
    }
    catch (const boost::filesystem::filesystem_error& ex)
    {
      // Input dir gone?
      edm::LogError("FedRawDataInputSource") << "grabNextFile BOOST FILESYSTEM ERROR CAUGHT -: " << ex.what();
      //                                     << " Maybe the file is not yet visible by FU. Trying again in one second";
      sleep(1);
      boost::filesystem::copy(jsonSourcePath,jsonDestPath);
    }
    daqDirector_->unlockFULocal();

    try {
      //sometimes this fails but file gets deleted
      boost::filesystem::remove(jsonSourcePath);
    }
    catch (const boost::filesystem::filesystem_error& ex)
    {
      // Input dir gone?
      edm::LogError("FedRawDataInputSource") << "grabNextFile BOOST FILESYSTEM ERROR CAUGHT -: " << ex.what();
    }
    catch (std::exception& ex)
    {
      // Input dir gone?
      edm::LogError("FedRawDataInputSource") << "grabNextFile std::exception CAUGHT -: " << ex.what();
    }

    boost::filesystem::ifstream ij(jsonDestPath);
    Json::Value deserializeRoot;
    Json::Reader reader;

    if (!reader.parse(ij, deserializeRoot))
      throw std::runtime_error("Cannot deserialize input JSON file");

    //read BU JSON
    std::string data;
    DataPoint dp;
    dp.deserialize(deserializeRoot);
    bool success = false;
    for (unsigned int i=0;i<dpd_->getNames().size();i++) {
      if (dpd_->getNames().at(i)=="NEvents")
    if (i<dp.getData().size()) {
      data = dp.getData()[i];
      success=true;
    }
    }
    if (!success) {
      if (dp.getData().size())
    data = dp.getData()[0];
      else
    throw cms::Exception("FedRawDataInputSource::grabNextJsonFile") <<
      " error reading number of events from BU JSON -: No input value " << data;
    }
    return boost::lexical_cast<int>(data);

  }
  catch (const boost::filesystem::filesystem_error& ex)
  {
    // Input dir gone?
    daqDirector_->unlockFULocal();
    edm::LogError("FedRawDataInputSource") << "grabNextJsonFile - BOOST FILESYSTEM ERROR CAUGHT -: " << ex.what();
  }
  catch (std::runtime_error e)
  {
    // Another process grabbed the file and NFS did not register this
    daqDirector_->unlockFULocal();
    edm::LogError("FedRawDataInputSource") << "grabNextJsonFile - runtime Exception -: " << e.what();
  }

  catch( boost::bad_lexical_cast const& ) {
    edm::LogError("FedRawDataInputSource") << "grabNextJsonFile - error parsing number of events from BU JSON. "
                                           << "Input value is -: " << data;
  }

  catch (std::exception e)
  {
    // BU run directory disappeared?
    daqDirector_->unlockFULocal();
    edm::LogError("FedRawDataInputSource") << "grabNextFile - SOME OTHER EXCEPTION OCCURED!!!! -: " << e.what();
  }

  return -1;
}

void FedRawDataInputSource::preForkReleaseResources()
{}

void FedRawDataInputSource::postForkReacquireResources(std::shared_ptr<edm::multicore::MessageReceiverForSource>)
{
  InputSource::rewind();
  setRunAuxiliary(
                  new edm::RunAuxiliary(runNumber_, edm::Timestamp::beginOfTime(),
                    edm::Timestamp::invalidTimestamp()));
}

void FedRawDataInputSource::rewind_()
{}


void FedRawDataInputSource::readSupervisor()
{
  bool stop=false;
  unsigned int currentLumiSection = 0;
  //threadInit_.exchange(true,std::memory_order_acquire);

  {
    std::unique_lock<std::mutex> lk(startupLock_);
    startupCv_.notify_one();
  }

  uint32_t ls=0;
  uint32_t monLS=1;
  uint32_t lockCount=0;
  uint64_t sumLockWaitTimeUs=0.;

  while (!stop) {

    //wait for at least one free thread and chunk
    int counter=0;
    while ((workerPool_.empty() && !singleBufferMode_) || freeChunks_.empty() || readingFilesCount_>=maxBufferedFiles_)
    {
      std::unique_lock<std::mutex> lkw(mWakeup_);
      //sleep until woken up by condition or a timeout
      if (cvWakeup_.wait_for(lkw, std::chrono::milliseconds(100)) == std::cv_status::timeout) {
        counter++;
        //if (!(counter%50)) edm::LogInfo("FedRawDataInputSource") << "No free chunks or threads...";
        LogDebug("FedRawDataInputSource") << "No free chunks or threads...";
      }
      else {
        assert(!(workerPool_.empty() && !singleBufferMode_) || freeChunks_.empty());
      }
      if (quit_threads_.load(std::memory_order_relaxed) || edm::shutdown_flag.load(std::memory_order_relaxed)) {stop=true;break;}
    }

    if (stop) break;

    //look for a new file
    std::string nextFile;
    uint32_t fileSize;

    if (fms_) fms_->startedLookingForFile();

    evf::EvFDaqDirector::FileStatus status =  evf::EvFDaqDirector::noFile;

    while (status == evf::EvFDaqDirector::noFile) {
      if (quit_threads_.load(std::memory_order_relaxed) || edm::shutdown_flag.load(std::memory_order_relaxed)) {
    stop=true;
    break;
      }
     
      uint64_t thisLockWaitTimeUs=0.;
      if (fileListMode_) {
        //return LS if LS not set, otherwise return file
        status = getFile(ls,nextFile,fileSize,thisLockWaitTimeUs);
      }
      else
        status = daqDirector_->updateFuLock(ls,nextFile,fileSize,thisLockWaitTimeUs);

      if (currentLumiSection!=ls && status==evf::EvFDaqDirector::runEnded) status=evf::EvFDaqDirector::noFile;

      //monitoring of lock wait time
      if (thisLockWaitTimeUs>0.)
        sumLockWaitTimeUs+=thisLockWaitTimeUs;
      lockCount++;
      if (ls>monLS) {
          monLS=ls;
          if (lockCount)
            if (fms_) fms_->reportLockWait(monLS,sumLockWaitTimeUs,lockCount);
          lockCount=0;
          sumLockWaitTimeUs=0;
      }

      //check again for any remaining index/EoLS files after EoR file is seen
      if ( status == evf::EvFDaqDirector::runEnded && !fileListMode_) {
        usleep(100000);
        //now all files should have appeared in ramdisk, check again if any raw files were left behind
        status = daqDirector_->updateFuLock(ls,nextFile,fileSize,thisLockWaitTimeUs);
        if (currentLumiSection!=ls && status==evf::EvFDaqDirector::runEnded) status=evf::EvFDaqDirector::noFile;
      }

      if ( status == evf::EvFDaqDirector::runEnded) {
    fileQueue_.push(new InputFile(evf::EvFDaqDirector::runEnded));
    stop=true;
    break;
      }

      //queue new lumisection
      if( getLSFromFilename_ && ls > currentLumiSection) {
    currentLumiSection = ls;
    fileQueue_.push(new InputFile(evf::EvFDaqDirector::newLumi, currentLumiSection));
      }

      if( getLSFromFilename_ && currentLumiSection>0 && ls < currentLumiSection) {
          edm::LogError("FedRawDataInputSource") << "Got old LS ("<<ls<<") file from EvFDAQDirector! Expected LS:" << currentLumiSection<<". Aborting execution."<<std::endl;
      fileQueue_.push(new InputFile(evf::EvFDaqDirector::runAbort, 0));
      stop=true;
      break;
      }

      int dbgcount=0;
      if (status == evf::EvFDaqDirector::noFile) {
    dbgcount++;
    if (!(dbgcount%20)) LogDebug("FedRawDataInputSource") << "No file for me... sleep and try again...";
    usleep(100000);
      }
    }
    if ( status == evf::EvFDaqDirector::newFile ) {
      LogDebug("FedRawDataInputSource") << "The director says to grab -: " << nextFile;


      boost::filesystem::path rawFilePath(nextFile);
      std::string rawFile = rawFilePath.replace_extension(".raw").string();

      struct stat st;
      int stat_res = stat(rawFile.c_str(),&st);
      if (stat_res==-1) {
        edm::LogError("FedRawDataInputSource") << "Can not stat file (" << errno << "):-"<< rawFile << std::endl;
        setExceptionState_=true;
    stop=true;
        break;
      }
      fileSize=st.st_size;

      if (fms_) fms_->stoppedLookingForFile(ls);
      int eventsInNewFile;
      if (fileListMode_) {
        if (fileSize==0) eventsInNewFile=0;
        else eventsInNewFile=-1;
      }
      else {
        eventsInNewFile = grabNextJsonFile(nextFile);
        assert( eventsInNewFile>=0 );
        assert((eventsInNewFile>0) == (fileSize>0));//file without events must be empty
      }
      //int eventsInNewFile = fileListMode_ ? -1 : grabNextJsonFile(nextFile);
      //if (fileListMode_ && fileSize==0) {eventsInNewFile=0;}
      //if (!fileListMode_) {
      //  assert( eventsInNewFile>=0 );
      //  assert((eventsInNewFile>0) == (fileSize>0));//file without events must be empty
      //}

      if (!singleBufferMode_) {
    //calculate number of needed chunks
    unsigned int neededChunks = fileSize/eventChunkSize_;
    if (fileSize%eventChunkSize_) neededChunks++;

        InputFile * newInputFile = new InputFile(evf::EvFDaqDirector::FileStatus::newFile,ls,rawFile,fileSize,neededChunks,eventsInNewFile,this);
        readingFilesCount_++;
        fileQueue_.push(newInputFile);

    for (unsigned int i=0;i<neededChunks;i++) {

      //get thread
      unsigned int newTid = 0xffffffff;
      while (!workerPool_.try_pop(newTid)) {
        usleep(100000);
      }

      InputChunk * newChunk = nullptr;
      while (!freeChunks_.try_pop(newChunk)) {
            usleep(100000);
            if (quit_threads_.load(std::memory_order_relaxed)) break;
      }

          if (newChunk == nullptr) {
            //return unused tid if we received shutdown (nullptr chunk)
            if (newTid!=0xffffffff) workerPool_.push(newTid);
            stop = true;
            break;
          }

      std::unique_lock<std::mutex> lk(mReader_);

      unsigned int toRead = eventChunkSize_;
      if (i==neededChunks-1 && fileSize%eventChunkSize_) toRead = fileSize%eventChunkSize_;
      newChunk->reset(i*eventChunkSize_,toRead,i);

      workerJob_[newTid].first=newInputFile;
      workerJob_[newTid].second=newChunk;

      //wake up the worker thread
      cvReader_[newTid]->notify_one();
    }
      }
      else {
    if (!eventsInNewFile) {
      //still queue file for lumi update
      std::unique_lock<std::mutex> lkw(mWakeup_);
      InputFile * newInputFile = new InputFile(evf::EvFDaqDirector::FileStatus::newFile,ls,rawFile,0,0,0,this);
          readingFilesCount_++;
      fileQueue_.push(newInputFile);
      cvWakeup_.notify_one();
      return;
    }
    //in single-buffer mode put single chunk in the file and let the main thread read the file
    InputChunk * newChunk;
    //should be available immediately
    while(!freeChunks_.try_pop(newChunk)) usleep(100000);

        std::unique_lock<std::mutex> lkw(mWakeup_);

        unsigned int toRead = eventChunkSize_;
        if (fileSize%eventChunkSize_) toRead = fileSize%eventChunkSize_;
        newChunk->reset(0,toRead,0);
        newChunk->readComplete_=true;

        //push file and wakeup main thread
        InputFile * newInputFile = new InputFile(evf::EvFDaqDirector::FileStatus::newFile,ls,rawFile,fileSize,1,eventsInNewFile,this);
        newInputFile->chunks_[0]=newChunk;
        readingFilesCount_++;
        fileQueue_.push(newInputFile);
        cvWakeup_.notify_one();
      }
    }
  }
  //make sure threads finish reading
  unsigned numFinishedThreads = 0;
  while (numFinishedThreads < workerThreads_.size()) {
    unsigned int tid;
    while (!workerPool_.try_pop(tid)) {usleep(10000);}
    std::unique_lock<std::mutex> lk(mReader_);
    thread_quit_signal[tid]=true;
    cvReader_[tid]->notify_one();
    numFinishedThreads++;
  }
  for (unsigned int i=0;i<workerThreads_.size();i++) {
    workerThreads_[i]->join();
    delete workerThreads_[i];
  }
}

void FedRawDataInputSource::readWorker(unsigned int tid)
{
  bool init = true;
  threadInit_.exchange(true,std::memory_order_acquire);

  while (1) {

    std::unique_lock<std::mutex> lk(mReader_);
    workerJob_[tid].first=nullptr;
    workerJob_[tid].first=nullptr;

    assert(!thread_quit_signal[tid]);//should never get it here
    workerPool_.push(tid);

    if (init) {
      std::unique_lock<std::mutex> lk(startupLock_);
      init = false;
      startupCv_.notify_one();
    }
    cvReader_[tid]->wait(lk);

    if (thread_quit_signal[tid])  return;

    InputFile * file;
    InputChunk * chunk;

    assert(workerJob_[tid].first!=nullptr && workerJob_[tid].second!=nullptr);

    file = workerJob_[tid].first;
    chunk = workerJob_[tid].second;

    int fileDescriptor = open(file->fileName_.c_str(), O_RDONLY);
    off_t pos = lseek(fileDescriptor,chunk->offset_,SEEK_SET);


    if (fileDescriptor>=0)
      LogDebug("FedRawDataInputSource") << "Reader thread opened file -: TID: " << tid << " file: " << file->fileName_ << " at offset " << pos;
    else
    {
      edm::LogError("FedRawDataInputSource") <<
      "readWorker failed to open file -: " << file->fileName_ << " fd:" << fileDescriptor <<
      " or seek to offset " << chunk->offset_ << ", lseek returned:" << pos;
      setExceptionState_=true;
      return;

    }

    unsigned int bufferLeft = 0;
    auto start = std::chrono::high_resolution_clock::now();
    for (unsigned int i=0;i<readBlocks_;i++)
    {
      const ssize_t last = ::read(fileDescriptor,( void*) (chunk->buf_+bufferLeft), eventChunkBlock_);
      if ( last > 0 )
    bufferLeft+=last;
      if (last < eventChunkBlock_) {
    assert(chunk->usedSize_==i*eventChunkBlock_+last);
    break;
      }
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto diff = end-start;
    std::chrono::milliseconds msec = std::chrono::duration_cast<std::chrono::milliseconds>(diff);
    LogDebug("FedRawDataInputSource") << " finished reading block -: " << (bufferLeft >> 20) << " MB" << " in " << msec.count() << " ms ("<< (bufferLeft >> 20)/double(msec.count())<<" GB/s)";
    close(fileDescriptor);

    if (detectedFRDversion_==0 && chunk->offset_==0) detectedFRDversion_=*((uint32*)chunk->buf_);
    assert(detectedFRDversion_<=5);
    chunk->readComplete_=true;//this is atomic to secure the sequential buffer fill before becoming available for processing)
    file->chunks_[chunk->fileIndex_]=chunk;//put the completed chunk in the file chunk vector at predetermined index

  }
}

void FedRawDataInputSource::threadError()
{
  quit_threads_=true;
  throw cms::Exception("FedRawDataInputSource:threadError") << " file reader thread error ";

}


inline bool InputFile::advance(unsigned char* & dataPosition, const size_t size)
{
  //wait for chunk
  while (!waitForChunk(currentChunk_)) {
    usleep(100000);
    if (parent_->exceptionState()) parent_->threadError();
  }

  dataPosition = chunks_[currentChunk_]->buf_+ chunkPosition_;
  size_t currentLeft = chunks_[currentChunk_]->size_ - chunkPosition_;

  if (currentLeft < size) {

    //we need next chunk
    while (!waitForChunk(currentChunk_+1)) {
      usleep(100000);
      if (parent_->exceptionState()) parent_->threadError();
    }
    //copy everything to beginning of the first chunk
    dataPosition-=chunkPosition_;
    assert(dataPosition==chunks_[currentChunk_]->buf_);
    memmove(chunks_[currentChunk_]->buf_, chunks_[currentChunk_]->buf_+chunkPosition_, currentLeft);
    memcpy(chunks_[currentChunk_]->buf_ + currentLeft, chunks_[currentChunk_+1]->buf_, size - currentLeft);
    //set pointers at the end of the old data position
    bufferPosition_+=size;
    chunkPosition_=size-currentLeft;
    currentChunk_++;
    return true;
  }
  else {
    chunkPosition_+=size;
    bufferPosition_+=size;
    return false;
  }
}

inline void InputFile::moveToPreviousChunk(const size_t size, const size_t offset)
{
  //this will fail in case of events that are too large
  assert(size < chunks_[currentChunk_]->size_ - chunkPosition_);
  assert(size - offset < chunks_[currentChunk_]->size_);
  memcpy(chunks_[currentChunk_-1]->buf_+offset,chunks_[currentChunk_]->buf_+chunkPosition_,size);
  chunkPosition_+=size;
  bufferPosition_+=size;
}

inline void InputFile::rewindChunk(const size_t size) {
  chunkPosition_-=size;
  bufferPosition_-=size;
}

//single-buffer mode file reading
void FedRawDataInputSource::readNextChunkIntoBuffer(InputFile *file)
{

  if (fileDescriptor_<0) {
    fileDescriptor_ = open(file->fileName_.c_str(), O_RDONLY);
    bufferInputRead_ = 0;
    //off_t pos = lseek(fileDescriptor,0,SEEK_SET);
    if (fileDescriptor_>=0)
      LogDebug("FedRawDataInputSource") << "opened file -: " << std::endl << file->fileName_;
    else
    {
      throw cms::Exception("FedRawDataInputSource:readNextChunkIntoBuffer") << "failed to open file " << std::endl
            << file->fileName_ << " fd:" << fileDescriptor_;
    }
  }

  if (file->chunkPosition_ == 0) { //in the rare case the last byte barely fit
    uint32_t existingSize = 0;
    for (unsigned int i=0;i<readBlocks_;i++)
    {
      const ssize_t last = ::read(fileDescriptor_,( void*) (file->chunks_[0]->buf_ + existingSize), eventChunkBlock_);
      bufferInputRead_+=last;
      existingSize+=last;
    }
  }
  else {
    const uint32_t chunksize = file->chunkPosition_;
    const uint32_t blockcount=chunksize/eventChunkBlock_;
    const uint32_t leftsize = chunksize%eventChunkBlock_;
    uint32_t existingSize = eventChunkSize_ - file->chunkPosition_;
    memmove((void*) file->chunks_[0]->buf_, file->chunks_[0]->buf_ + file->chunkPosition_, existingSize);

    for (uint32_t i=0;i<blockcount;i++) {
      const ssize_t last = ::read(fileDescriptor_,( void*) (file->chunks_[0]->buf_ + existingSize), eventChunkBlock_);
      bufferInputRead_+=last;
      existingSize+=last;
    }
    if (leftsize) {
      const ssize_t last = ::read(fileDescriptor_,( void*)( file->chunks_[0]->buf_ + existingSize ), leftsize);
      bufferInputRead_+=last;
    }
    file->chunkPosition_=0;//data was moved to beginning of the chunk
  }
  if (bufferInputRead_ == file->fileSize_) { // no more data in this file
    if (fileDescriptor_!=-1)
    {
      LogDebug("FedRawDataInputSource") << "Closing input file -: " << std::endl << file->fileName_;
      close(fileDescriptor_);
      fileDescriptor_=-1;
    }
  }
}


void FedRawDataInputSource::reportEventsThisLumiInSource(unsigned int lumi,unsigned int events)
{

  std::lock_guard<std::mutex> lock(monlock_);
  auto itr = sourceEventsReport_.find(lumi);
  if (itr!=sourceEventsReport_.end())
    itr->second+=events;
  else 
    sourceEventsReport_[lumi]=events;
}

std::pair<bool,unsigned int> FedRawDataInputSource::getEventReport(unsigned int lumi, bool erase)
{
  std::lock_guard<std::mutex> lock(monlock_);
  auto itr = sourceEventsReport_.find(lumi);
  if (itr!=sourceEventsReport_.end()) {
    auto && ret = std::pair<bool,unsigned int>(true,itr->second);
    if (erase) 
      sourceEventsReport_.erase(itr);
    return ret;
  }
  else 
    return std::pair<bool,unsigned int>(false,0);
}

long FedRawDataInputSource::initFileList()
{
  std::sort(fileNames_.begin(),fileNames_.end(),
            [](std::string a, std::string b) {
              if (a.rfind("/")!=std::string::npos) a=a.substr(a.rfind("/"));
              if (b.rfind("/")!=std::string::npos) b=b.substr(b.rfind("/"));
              return b > a;});

  if (fileNames_.size()) {
    //get run number from first file in the vector
    boost::filesystem::path fileName = fileNames_[0];
    std::string fileStem = fileName.stem().string();
    auto end = fileStem.find("_");
    if (fileStem.find("run")==0) {
      std::string runStr = fileStem.substr(3,end-3);
      try {
        //get long to support test run numbers < 2^32
        long rval = boost::lexical_cast<long>(runStr);
        edm::LogInfo("FedRawDataInputSource") << "Autodetected run number in fileListMode -: "<< rval;
        return rval;
      }
      catch( boost::bad_lexical_cast const& ) {
        edm::LogWarning("FedRawDataInputSource") << "Unable to autodetect run number in fileListMode from file -: "<< fileName;
      }
    }
  }
  return -1;
}

evf::EvFDaqDirector::FileStatus FedRawDataInputSource::getFile(unsigned int& ls, std::string& nextFile, uint32_t& fsize, uint64_t& lockWaitTime)
{
  if (fileListIndex_ < fileNames_.size()) {
          nextFile = fileNames_[fileListIndex_];
          if (nextFile.find("file://")==0) nextFile=nextFile.substr(7);
          else if (nextFile.find("file:")==0) nextFile=nextFile.substr(5);
          boost::filesystem::path fileName = nextFile;
          std::string fileStem = fileName.stem().string();
          if (fileStem.find("ls")) fileStem = fileStem.substr(fileStem.find("ls")+2);
          if (fileStem.find("_")) fileStem = fileStem.substr(0,fileStem.find("_"));
          ls = boost::lexical_cast<unsigned int>(fileStem);
          //fsize = 0;
          //lockWaitTime = 0;
          fileListIndex_++;
          return evf::EvFDaqDirector::newFile;
  }
  else
    return evf::EvFDaqDirector::runEnded;
}