FileProducer.cxx

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#include "EventVisualisationBase/DirectoryLoader.h"
#include "EveWorkflow/FileProducer.h"
#include "CommonUtils/FileSystemUtils.h"
 
#include <deque>
#include <chrono>
#include <filesystem>
#include <algorithm>
#include <climits>
#include <fmt/core.h>
 
using namespace o2::event_visualisation;
 
using std::chrono::duration_cast;
using std::chrono::milliseconds;
using std::chrono::system_clock;
 
FileProducer::FileProducer(const std::string& path, const std::string& ext, int filesInFolder, const std::string& name)
{
  this->mFilesInFolder = filesInFolder;
  this->mPath = path;
  this->mName = name;
  this->mExt = ext;
  o2::utils::createDirectoriesIfAbsent(path); // create folder if not exists (fails if no rights)
}
 
std::string FileProducer::newFileName() const
{
  const auto millisec_since_epoch = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
 
  char hostname[_POSIX_HOST_NAME_MAX];
  gethostname(hostname, _POSIX_HOST_NAME_MAX);
 
  const auto pid = getpid();
  const auto result = fmt::format(fmt::runtime(this->mName),
                                  fmt::arg("hostname", hostname),
                                  fmt::arg("pid", pid),
                                  fmt::arg("timestamp", millisec_since_epoch),
                                  fmt::arg("ext", this->mExt));
  const std::vector<std::string> ext = {".json", ".root", ".eve"};
  DirectoryLoader::reduceNumberOfFiles(this->mPath, DirectoryLoader::load(this->mPath, "_", ext), this->mFilesInFolder);
 
  return this->mPath + "/" + result;
}