view common.cpp @ 381:9742ea0ac33d

API const correctness.

The char *path arguments to audiodb_open() and audiodb_create() should
be const; make it so.

Also arrange for the datasize, ntracks and datadim arguments to
audiodb_create() to be unsigned to match the fields in the internal
audioDB class.  Technically this is an ABI change, but since nothing is
calling this function with anything other than zero arguments yet
(correct me if I'm wrong) no-one should notice.  (If you notice, shout)

#include "audioDB.h"

#if defined(O2_DEBUG)
void sigterm_action(int signal, siginfo_t *info, void *context) {
  exit(128+signal);
}

void sighup_action(int signal, siginfo_t *info, void *context) {
  // FIXME: reread any configuration files
}
#endif

void audioDB::get_lock(int fd, bool exclusive) {
  struct flock lock;
  int status;
  
  lock.l_type = exclusive ? F_WRLCK : F_RDLCK;
  lock.l_whence = SEEK_SET;
  lock.l_start = 0;
  lock.l_len = 0; /* "the whole file" */

 retry:
  do {
    status = fcntl(fd, F_SETLKW, &lock);
  } while (status != 0 && errno == EINTR);
  
  if (status) {
    if (errno == EAGAIN) {
      sleep(1);
      goto retry;
    } else {
      error("fcntl lock error", "", "fcntl");
    }
  }
}

void audioDB::release_lock(int fd) {
  struct flock lock;
  int status;

  lock.l_type = F_UNLCK;
  lock.l_whence = SEEK_SET;
  lock.l_start = 0;
  lock.l_len = 0;

  status = fcntl(fd, F_SETLKW, &lock);

  if (status)
    error("fcntl unlock error", "", "fcntl");
}

void audioDB::error(const char* a, const char* b, const char *sysFunc) {
 

    if(isServer) {
        /* FIXME: I think this is leaky -- we never delete err.
           actually deleting it is tricky, though; it gets placed into
           some soap-internal struct with uncertain extent... -- CSR,
           2007-10-01 */
        char *err = new char[256]; /* FIXME: overflows */
        snprintf(err, 255, "%s: %s\n%s", a, b, sysFunc ? strerror(errno) : "");
        /* FIXME: actually we could usefully do with a properly
           structured type, so that we can throw separate faultstring
           and details.  -- CSR, 2007-10-01 */
        throw(err);
    } else if (UseApiError){
        apierrortemp=-1;
        throw(apierrortemp);
    } else {
        std::cerr << a << ": " << b << std::endl;
        if (sysFunc) {
            perror(sysFunc);
        }
        exit(1);
    }

}

void audioDB::initRNG() {
  rng = gsl_rng_alloc(gsl_rng_mt19937);
  if(!rng) {
    error("could not allocate Random Number Generator");
  }
  /* FIXME: maybe we should use a real source of entropy? */
  gsl_rng_set(rng, time(NULL));
}

void audioDB::initDBHeader(const char* dbName) {
  if ((dbfid = open(dbName, forWrite ? O_RDWR : O_RDONLY)) < 0) {
    error("Can't open database file", dbName, "open");
  }

  get_lock(dbfid, forWrite);
  // Get the database header info
  dbH = new dbTableHeaderT();
  assert(dbH);
  
  if(read(dbfid, (char *) dbH, O2_HEADERSIZE) != O2_HEADERSIZE) {
    error("error reading db header", dbName, "read");
  }

  if(dbH->magic == O2_OLD_MAGIC) {
    // FIXME: if anyone ever complains, write the program to convert
    // from the old audioDB format to the new...
    error("database file has old O2 header", dbName);
  }

  if(dbH->magic != O2_MAGIC) {
    std::cerr << "expected: " << O2_MAGIC << ", got: " << dbH->magic << std::endl;
    error("database file has incorrect header", dbName);
  }

  if(dbH->version != O2_FORMAT_VERSION) {
    error("database file has incorrect version", dbName);
  }

  if(dbH->headerSize != O2_HEADERSIZE) {
    error("sizeof(dbTableHeader) unexpected: platform ABI mismatch?", dbName);
  }

  CHECKED_MMAP(char *, db, 0, getpagesize());

  // Make some handy tables with correct types
  if(forWrite || (dbH->length > 0)) {
    if(forWrite) {
      fileTableLength = dbH->trackTableOffset - dbH->fileTableOffset;
      trackTableLength = dbH->dataOffset - dbH->trackTableOffset;
      dataBufLength = dbH->timesTableOffset - dbH->dataOffset;
      timesTableLength = dbH->powerTableOffset - dbH->timesTableOffset;
      powerTableLength = dbH->l2normTableOffset - dbH->powerTableOffset;
      l2normTableLength = dbH->dbSize - dbH->l2normTableOffset;
    } else {
      fileTableLength = ALIGN_PAGE_UP(dbH->numFiles * O2_FILETABLE_ENTRY_SIZE);
      trackTableLength = ALIGN_PAGE_UP(dbH->numFiles * O2_TRACKTABLE_ENTRY_SIZE);
      if( dbH->flags & O2_FLAG_LARGE_ADB ){
	dataBufLength = ALIGN_PAGE_UP(dbH->numFiles * O2_FILETABLE_ENTRY_SIZE);
	timesTableLength = ALIGN_PAGE_UP(dbH->numFiles * O2_FILETABLE_ENTRY_SIZE);
	powerTableLength = ALIGN_PAGE_UP(dbH->numFiles * O2_FILETABLE_ENTRY_SIZE);
	l2normTableLength = 0;
      }
      else{
	dataBufLength = ALIGN_PAGE_UP(dbH->length);
	timesTableLength = ALIGN_PAGE_UP(2*(dbH->length / dbH->dim));
	powerTableLength = ALIGN_PAGE_UP(dbH->length / dbH->dim);
	l2normTableLength = ALIGN_PAGE_UP(dbH->length / dbH->dim);
      }
    }
    CHECKED_MMAP(char *, fileTable, dbH->fileTableOffset, fileTableLength);
    CHECKED_MMAP(unsigned *, trackTable, dbH->trackTableOffset, trackTableLength);
    /*
     * No more mmap() for dataBuf
     *
     * FIXME: Actually we do do the mmap() in the two cases where it's
     * still "needed": in pointQuery and in l2norm if dbH->length is
     * non-zero.  Removing those cases too (and deleting the dataBuf
     * variable completely) would be cool.  -- CSR, 2007-11-19
     *
     * CHECKED_MMAP(double *, dataBuf, dbH->dataOffset, dataBufLength);
     */
    if( dbH->flags & O2_FLAG_LARGE_ADB ){
      CHECKED_MMAP(char *, featureFileNameTable, dbH->dataOffset, fileTableLength);
      if( dbH->flags & O2_FLAG_TIMES )
	CHECKED_MMAP(char *, timesFileNameTable, dbH->timesTableOffset, fileTableLength);
      if( dbH->flags & O2_FLAG_POWER )
	CHECKED_MMAP(char *, powerFileNameTable, dbH->powerTableOffset, fileTableLength);
    }
    else{
      CHECKED_MMAP(double *, timesTable, dbH->timesTableOffset, timesTableLength);
      CHECKED_MMAP(double *, powerTable, dbH->powerTableOffset, powerTableLength);
      CHECKED_MMAP(double *, l2normTable, dbH->l2normTableOffset, l2normTableLength);
    }
  }

  // build track offset table
  trackOffsetTable = new off_t[dbH->numFiles];
  Uns32T cumTrack=0;
  for(Uns32T k = 0; k < dbH->numFiles; k++){
    trackOffsetTable[k] = cumTrack;
    cumTrack += trackTable[k] * dbH->dim;
  }

  // Assign correct number of point bits per track in LSH indexing / retrieval
  lsh_n_point_bits = dbH->flags >> 28;
  if( !lsh_n_point_bits )
    lsh_n_point_bits = O2_DEFAULT_LSH_N_POINT_BITS;
}

void audioDB::initInputFile (const char *inFile, bool loadData) {
  if (inFile) {
    if ((infid = open(inFile, O_RDONLY)) < 0) {
      error("can't open input file for reading", inFile, "open");
    }

    if (fstat(infid, &statbuf) < 0) {
      error("fstat error finding size of input", inFile, "fstat");
    }

    if(dbH->dim == 0 && dbH->length == 0) { // empty database
      // initialize with input dimensionality
      if(read(infid, &dbH->dim, sizeof(unsigned)) != sizeof(unsigned)) {
        error("short read of input file", inFile);
      }
      if(dbH->dim == 0) {
        error("dimensionality of zero in input file", inFile);
      }
    } else {
      unsigned test;
      if(read(infid, &test, sizeof(unsigned)) != sizeof(unsigned)) {
        error("short read of input file", inFile);
      }
      if(dbH->dim == 0) {
        error("dimensionality of zero in input file", inFile);
      }
      if(dbH->dim != test) {      
	std::cerr << "error: expected dimension: " << dbH->dim << ", got : " << test <<std::endl;
	error("feature dimensions do not match database table dimensions", inFile);
      }
    }
    
    if (loadData && ((indata = (char *) mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, infid, 0)) == (caddr_t) -1)) {
      error("mmap error for input", inFile, "mmap");
    }
  }
}

void audioDB::initTables(const char* dbName, const char* inFile) {
  /* FIXME: initRNG() really logically belongs in the audioDB
     contructor.  However, there are of the order of four constructors
     at the moment, and more to come from API implementation.  Given
     that duplication, I think this is the least worst place to put
     it; the assumption is that nothing which doesn't look at a
     database will need an RNG.  -- CSR, 2008-07-02 */
  initRNG();
  initDBHeader(dbName);
  if(inFile)
    initInputFile(inFile);
}

// If name is relative path, side effect name with prefix/name
// Do not free original pointer
void audioDB::prefix_name(char** const name, const char* prefix){
  // No prefix if prefix is empty
  if(!prefix)
    return;
  // Allocate new memory, keep old memory
  assert(name && *name);
  if (strlen(*name) + strlen(prefix) + 1 > O2_MAXFILESTR)
    error("error: path prefix + filename too long",prefix);
  // Do not prefix absolute path+filename
  if(**name=='/')
    return;
  // OK to prefix relative path+filename
  char* prefixedName = (char*) malloc(O2_MAXFILESTR);
  sprintf(prefixedName, "%s/%s", prefix, *name);
  *name = prefixedName; // side effect new name to old name
}