bool GlusterBackend::get(const SyncEvent* _getEvent) {
if(_getEvent == nullptr || _getEvent->fullPathBuffer.empty())
return false;
//Try to find file
/**
* RETURN VALUES
* NULL : Failure. @errno will be set with the type of failure.
* Others : Pointer to the opened glfs_fd_t.
*/
glfs_fd_t *fd = glfs_open((glfs_t*)fs, _getEvent->fullPathBuffer.c_str(), O_RDONLY);
if(!fd){
LOG(ERROR)<<"Error while openeing a handle to:"<<_getEvent->fullPathBuffer;
return false;
}
FileNode* fileNode = FileSystem::getInstance().findAndOpenNode(_getEvent->fullPathBuffer);
//If File exist then we won't download it!
if(fileNode!=nullptr){
LOG(DEBUG)<<"File "<<fileNode->getFullPath()<<" already exist! no need to download.";
//Close it! so it can be removed if needed
uint64_t inodeNum = FileSystem::getInstance().assignINodeNum((intptr_t)fileNode);
fileNode->close(inodeNum);
glfs_close(fd);
return false;
}
//Now create a file in FS
//handle directories
//FileSystem::getInstance().createHierarchy(_getEvent->fullPathBuffer,false);
//FileNode *newFile = FileSystem::getInstance().mkFile(_getEvent->fullPathBuffer,false,true);//open
string name = FileSystem::getInstance().getFileNameFromPath(_getEvent->fullPathBuffer);
FileNode* newFile = new FileNode(name,_getEvent->fullPathBuffer, false,false);
if(newFile == nullptr){
LOG(ERROR)<<"Failed to create a newNode:"<<_getEvent->fullPathBuffer;
glfs_close(fd);
return false;
}
//and write the content
uint64_t bufSize = 64ll*1024ll*1024ll;
char *buff = new char[bufSize];//64MB buffer
size_t offset = 0;
int64_t read = 0;
do {
//No need to download it anymore.
if(newFile->mustBeDeleted()){
delete newFile;
glfs_close(fd);
return true;
}
read = glfs_pread(fd,buff,bufSize,offset,0);
if(read < 0){
LOG(ERROR)<<"Error while reading: "<<_getEvent->fullPathBuffer;
glfs_close(fd);
return false;
}
if(read>0){
FileNode* afterMove = nullptr;
long retCode = newFile->writeHandler(buff,offset,read,afterMove,true);
while(retCode == -1)//-1 means moving
retCode = newFile->writeHandler(buff,offset,read,afterMove,true);
if(afterMove){
newFile = afterMove;
FileSystem::getInstance().replaceAllInodesByNewNode((intptr_t)newFile,(intptr_t)afterMove);
}
//Check space availability
if(retCode < 0) {
LOG(ERROR)<<"Error in writing file:"<<newFile->getFullPath()<<", probably no diskspace, Code:"<<retCode;
delete newFile;
glfs_close(fd);
delete []buff;
return false;
}
}
offset += read;
}while(read);
newFile->setNeedSync(false);//We have just created this file so it's upload flag false
glfs_close(fd);
delete []buff;
//Add it to File system
if(FileSystem::getInstance().createHierarchy(_getEvent->fullPathBuffer,false)==nullptr){
LOG(ERROR)<<"Error in creating hierarchy for newly downloaded file:"<<newFile->getFullPath();
delete newFile;
return false;
}
if(!FileSystem::getInstance().addFile(newFile)){
LOG(ERROR)<<"Error in adding newly downloaded file:"<<newFile->getFullPath();
delete newFile;
return false;
}
//Gone well
return true;
}
