/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/Utilities/StorageFactory/plugins/StormStorageMaker.cc

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#define ML_DEBUG 1
#include "Utilities/StorageFactory/interface/StorageMaker.h"
#include "Utilities/StorageFactory/interface/StorageMakerFactory.h"
#include "Utilities/StorageFactory/interface/StorageFactory.h"
#include "Utilities/StorageFactory/interface/File.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <cstdlib>
#include <cstdio>
#include <sys/stat.h>

class StormStorageMaker : public StorageMaker
{
  /* getTURL: Executes a prepare to get script and extracts the physical file path */
  std::string getTURL (const std::string &surl)
  {
    std::string client;
    if (char *p = getenv("CMS_STORM_PTG_CLIENT"))
      client = p;
    else
      throw cms::Exception("StormStorageMaker")
        << "$CMS_STORM_PTG_CLIENT has no value";

    // Command
    std::string comm(client + " srm:" + surl + " 2>&1"); 
    LogDebug("StormStorageMaker") << "command: " << comm << std::endl;

    FILE *pipe = popen(comm.c_str(), "r");
    if(! pipe)
      throw cms::Exception("StormStorageMaker")
        << "failed to execute PtG command: "
        << comm;

    // Get output
    int ch;
    std::string output;
    while ((ch = getc(pipe)) != EOF)
      output.push_back(ch);
    pclose(pipe);

    LogDebug("StormStorageMaker") << "output: " << output << std::endl;
 
    // Extract TURL if possible.
    size_t start = output.find("FilePath:", 0);
    if (start == std::string::npos)
      throw cms::Exception("StormStorageMaker")
        << "no turl found in command '" << comm << "' output:\n" << output;

    start += 9;
    std::string turl(output, start, output.find_first_of("\n", start) - start); 
    LogDebug("StormStorageMaker") << "file to open: " << turl << std::endl;
    return turl;
  }


public:
  virtual Storage *open (const std::string &proto,
                         const std::string &surl,
                         int mode)
  {
    StorageFactory *f = StorageFactory::get();
    StorageFactory::ReadHint readHint = f->readHint();
    StorageFactory::CacheHint cacheHint = f->cacheHint();

    if (readHint != StorageFactory::READ_HINT_UNBUFFERED
        || cacheHint == StorageFactory::CACHE_HINT_STORAGE)
      mode &= ~IOFlags::OpenUnbuffered;
    else
      mode |= IOFlags::OpenUnbuffered;

    std::string path = getTURL(surl);
    File *file = new File (path, mode); 
    return f->wrapNonLocalFile (file, proto, path, mode);
  }

  virtual bool check (const std::string &/*proto*/,
                      const std::string &path,
                      IOOffset *size = 0)
  {
    struct stat st;
    if (stat (getTURL(path).c_str(), &st) != 0)
      return false;

    if (size)
      *size = st.st_size;

    return true;
  }
};

DEFINE_EDM_PLUGIN (StorageMakerFactory, StormStorageMaker, "storm");