// Write out the given protobuf to the specified file descriptor by
// first writing out the length of the protobuf followed by the contents.
// NOTE: On error, this may have written partial data to the file.
inline Try<Nothing> write(int fd, const google::protobuf::Message& message)
{
if (!message.IsInitialized()) {
return Error("Uninitialized protocol buffer");
}
// First write the size of the protobuf.
uint32_t size = message.ByteSize();
std::string bytes = std::string((char*) &size, sizeof(size));
Try<Nothing> result = os::write(fd, bytes);
if (result.isError()) {
return Error("Failed to write size: " + result.error());
}
if (!message.SerializeToFileDescriptor(fd)) {
return Error("Failed to write/serialize message");
}
return Nothing();
}
// Write out the given protobuf to the specified file descriptor by
// first writing out the length of the protobuf followed by the
// contents.
inline Result<bool> write(int fd, const google::protobuf::Message& message)
{
if (!message.IsInitialized()) {
LOG(ERROR) << "Failed to write protocol buffer to file, "
<< "protocol buffer is not initialized!";
return false;
}
uint32_t size = message.ByteSize();
ssize_t length = ::write(fd, (void*) &size, sizeof(size));
if (length == -1) {
std::string error = strerror(errno);
error = error + " (" + __FILE__ + ":" + utils::stringify(__LINE__) + ")";
return Result<bool>::error(error);
}
CHECK(length != 0);
CHECK(length == sizeof(size)); // TODO(benh): Handle a non-blocking fd?
return message.SerializeToFileDescriptor(fd);
}
void PersistentData::setValueFilepath(const QString& filepath, const google::protobuf::Message& data, Global::DataFolderType dataFolderType, bool humanReadable)
try
{
const QString TEMP_FILEPATH(filepath + TEMP_SUFFIX_TERM);
// To avoid ::Print(..) to crash, see defect #153.
if (Global::availableDiskSpace(Global::getDataFolder(dataFolderType)) < 20 * 1024 * 1024)
return;
{
QFile file(TEMP_FILEPATH);
if (!file.open(QIODevice::WriteOnly))
throw PersistentDataIOException(QString("Unable to open the file in write mode : %1, error : %2").arg(TEMP_FILEPATH).arg(file.errorString()));
#if !DEBUG
if (humanReadable)
{
#endif
google::protobuf::io::FileOutputStream fileStream(file.handle());
google::protobuf::TextFormat::Printer printer;
printer.SetUseShortRepeatedPrimitives(true);
printer.Print(data, &fileStream);
#if !DEBUG
}
else
{
data.SerializeToFileDescriptor(file.handle());
}
#endif
}
Global::rename(TEMP_FILEPATH, filepath);
}
catch(Global::UnableToGetFolder& e)
{
throw PersistentDataIOException(e.errorMessage);
}