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XrdClLocalFileHandler.cc
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XrdClLocalFileHandler.cc
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//------------------------------------------------------------------------------
// Copyright (c) 2017 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
// Author: Paul-Niklas Kramp <p.n.kramp@gsi.de>
// Michal Simon <michal.simon@cern.ch>
//------------------------------------------------------------------------------
// XRootD is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// XRootD is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with XRootD. If not, see <http://www.gnu.org/licenses/>.
//------------------------------------------------------------------------------
#include "XrdCl/XrdClLocalFileHandler.hh"
#include "XrdCl/XrdClConstants.hh"
#include "XrdCl/XrdClPostMaster.hh"
#include "XrdCl/XrdClURL.hh"
#include "XrdCl/XrdClMessageUtils.hh"
#include "XrdCl/XrdClFileSystem.hh"
#include "XProtocol/XProtocol.hh"
#include <string>
#include <memory>
#include <stdexcept>
#include <iostream>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <aio.h>
namespace
{
class AioCtx
{
public:
enum Opcode
{
None,
Read,
Write,
Sync
};
AioCtx( const XrdCl::HostList &hostList, XrdCl::ResponseHandler *handler ) :
opcode( None ), hosts( new XrdCl::HostList( hostList ) ), handler( handler )
{
aiocb *ptr = new aiocb();
memset( ptr, 0, sizeof( aiocb ) );
XrdCl::Env *env = XrdCl::DefaultEnv::GetEnv();
int useSignals = XrdCl::DefaultAioSignal;
env->GetInt( "AioSignal", useSignals );
if( useSignals )
{
static SignalHandlerRegistrator registrator; // registers the signal handler
ptr->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
ptr->aio_sigevent.sigev_signo = SIGUSR1;
}
else
{
ptr->aio_sigevent.sigev_notify = SIGEV_THREAD;
ptr->aio_sigevent.sigev_notify_function = ThreadHandler;
}
ptr->aio_sigevent.sigev_value.sival_ptr = this;
cb.reset( ptr );
}
void SetWrite( int fd, size_t offset, size_t size, const void *buffer )
{
cb->aio_fildes = fd;
cb->aio_offset = offset;
cb->aio_buf = const_cast<void*>( buffer );
cb->aio_nbytes = size;
opcode = Opcode::Write;
}
void SetRead( int fd, size_t offset, size_t size, void *buffer )
{
cb->aio_fildes = fd;
cb->aio_offset = offset;
cb->aio_buf = buffer;
cb->aio_nbytes = size;
opcode = Opcode::Read;
}
void SetFsync( int fd )
{
cb->aio_fildes = fd;
opcode = Opcode::Sync;
}
static void ThreadHandler( sigval arg )
{
std::unique_ptr<AioCtx> me( reinterpret_cast<AioCtx*>( arg.sival_ptr ) );
Handler( std::move( me ) );
}
static void SignalHandler( int sig, siginfo_t *info, void *ucontext )
{
std::unique_ptr<AioCtx> me( reinterpret_cast<AioCtx*>( info->si_value.sival_ptr ) );
Handler( std::move( me ) );
}
operator aiocb*()
{
return cb.get();
}
private:
struct SignalHandlerRegistrator
{
SignalHandlerRegistrator()
{
struct sigaction newact, oldact;
newact.sa_sigaction = SignalHandler;
sigemptyset( &newact.sa_mask );
newact.sa_flags = SA_SIGINFO;
int rc = sigaction( SIGUSR1, &newact, &oldact );
if( rc < 0 )
throw std::runtime_error( strerror( errno ) );
}
};
static void Handler( std::unique_ptr<AioCtx> me )
{
if( me->opcode == Opcode::None )
return;
using namespace XrdCl;
int rc = aio_return( me->cb.get() );
if( rc < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, GetErrMsg( me->opcode ), strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
QueueTask( error, 0, me->hosts, me->handler );
}
else
{
AnyObject *resp = 0;
if( me->opcode == Opcode::Read )
{
ChunkInfo *chunk = new ChunkInfo( me->cb->aio_offset,
rc,
const_cast<void*>( me->cb->aio_buf ) );
resp = new AnyObject();
resp->Set( chunk );
}
QueueTask( new XRootDStatus(), resp, me->hosts, me->handler );
}
}
static const char* GetErrMsg( Opcode opcode )
{
static const char readmsg[] = "Read: failed %s";
static const char writemsg[] = "Write: failed %s";
static const char syncmsg[] = "Sync: failed %s";
switch( opcode )
{
case Opcode::Read: return readmsg;
case Opcode::Write: return writemsg;
case Opcode::Sync: return syncmsg;
default: return 0;
}
}
static void QueueTask( XrdCl::XRootDStatus *status, XrdCl::AnyObject *resp,
XrdCl::HostList *hosts, XrdCl::ResponseHandler *handler )
{
using namespace XrdCl;
// if it is simply the sync handler we can release the semaphore
// and return there is no need to execute this in the thread-pool
SyncResponseHandler *syncHandler =
dynamic_cast<SyncResponseHandler*>( handler );
if( syncHandler )
{
syncHandler->HandleResponse( status, resp );
}
else
{
JobManager *jmngr = DefaultEnv::GetPostMaster()->GetJobManager();
LocalFileTask *task = new LocalFileTask( status, resp, hosts, handler );
jmngr->QueueJob( task );
}
}
std::unique_ptr<aiocb> cb;
Opcode opcode;
XrdCl::HostList *hosts;
XrdCl::ResponseHandler *handler;
};
};
namespace XrdCl
{
//------------------------------------------------------------------------
// Constructor
//------------------------------------------------------------------------
LocalFileHandler::LocalFileHandler() :
fd( -1 )
{
jmngr = DefaultEnv::GetPostMaster()->GetJobManager();
}
//------------------------------------------------------------------------
// Destructor
//------------------------------------------------------------------------
LocalFileHandler::~LocalFileHandler()
{
}
//------------------------------------------------------------------------
// Open
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Open( const std::string& url, uint16_t flags,
uint16_t mode, ResponseHandler* handler, uint16_t timeout )
{
AnyObject *resp = 0;
XRootDStatus st = OpenImpl( url, flags, mode, resp );
if( !st.IsOK() && st.code != errErrorResponse )
return st;
return QueueTask( new XRootDStatus( st ), resp, handler );
}
XRootDStatus LocalFileHandler::Open( const URL *url, const Message *req, AnyObject *&resp )
{
const ClientOpenRequest* request =
reinterpret_cast<const ClientOpenRequest*>( req->GetBuffer() );
uint16_t flags = ntohs( request->options );
uint16_t mode = ntohs( request->mode );
return OpenImpl( url->GetURL(), flags, mode, resp );
}
//------------------------------------------------------------------------
// Close
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Close( ResponseHandler* handler,
uint16_t timeout )
{
if( close( fd ) == -1 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "Close: file fd: %i %s", fd, strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
return QueueTask( error, 0, handler );
}
return QueueTask( new XRootDStatus(), 0, handler );
}
//------------------------------------------------------------------------
// Stat
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Stat( ResponseHandler* handler,
uint16_t timeout )
{
Log *log = DefaultEnv::GetLog();
struct stat ssp;
if( fstat( fd, &ssp ) == -1 )
{
log->Error( FileMsg, "Stat: failed fd: %i %s", fd, strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
return QueueTask( error, 0, handler );
}
std::ostringstream data;
data << ssp.st_dev << " " << ssp.st_size << " " << ssp.st_mode << " "
<< ssp.st_mtime;
log->Debug( FileMsg, data.str().c_str() );
StatInfo *statInfo = new StatInfo();
if( !statInfo->ParseServerResponse( data.str().c_str() ) )
{
log->Error( FileMsg, "Stat: ParseServerResponse failed." );
delete statInfo;
return QueueTask( new XRootDStatus( stError, errErrorResponse, kXR_FSError ),
0, handler );
}
AnyObject *resp = new AnyObject();
resp->Set( statInfo );
return QueueTask( new XRootDStatus(), resp, handler );
}
//------------------------------------------------------------------------
// Read
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Read( uint64_t offset, uint32_t size,
void* buffer, ResponseHandler* handler, uint16_t timeout )
{
AioCtx *ctx = new AioCtx( pHostList, handler );
ctx->SetRead( fd, offset, size, buffer );
int rc = aio_read( *ctx );
if( rc < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "Read: failed %s", strerror( errno ) );
return XRootDStatus( stError, errOSError, XProtocol::mapError( rc ),
strerror( errno ) );
}
return XRootDStatus();
}
//------------------------------------------------------------------------
// Write
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Write( uint64_t offset, uint32_t size,
const void* buffer, ResponseHandler* handler, uint16_t timeout )
{
AioCtx *ctx = new AioCtx( pHostList, handler );
ctx->SetWrite( fd, offset, size, buffer );
int rc = aio_write( *ctx );
if( rc < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "Write: failed %s", strerror( errno ) );
return XRootDStatus( stError, errOSError, XProtocol::mapError( rc ),
strerror( errno ) );
}
return XRootDStatus();
}
//------------------------------------------------------------------------
// Sync
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Sync( ResponseHandler* handler,
uint16_t timeout )
{
AioCtx *ctx = new AioCtx( pHostList, handler );
ctx->SetFsync( fd );
int rc = aio_fsync( O_SYNC, *ctx );
if( rc < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "Sync: failed %s", strerror( errno ) );
return XRootDStatus( stError, errOSError, XProtocol::mapError( rc ),
strerror( errno ) );
}
return XRootDStatus();
}
//------------------------------------------------------------------------
// Truncate
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Truncate( uint64_t size,
ResponseHandler* handler, uint16_t timeout )
{
if( ftruncate( fd, size ) )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "Truncate: failed, file descriptor: %i, %s", fd,
strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
return QueueTask( error, 0, handler );
}
return QueueTask( new XRootDStatus( stOK ), 0, handler );
}
//------------------------------------------------------------------------
// VectorRead
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::VectorRead( const ChunkList& chunks,
void* buffer, ResponseHandler* handler, uint16_t timeout )
{
std::unique_ptr<VectorReadInfo> info( new VectorReadInfo() );
size_t totalSize = 0;
bool useBuffer( buffer );
for( auto itr = chunks.begin(); itr != chunks.end(); ++itr )
{
auto &chunk = *itr;
if( !useBuffer )
buffer = chunk.buffer;
ssize_t bytesRead = pread( fd, buffer, chunk.length,
chunk.offset );
if( bytesRead < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "VectorRead: failed, file descriptor: %i, %s",
fd, strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
return QueueTask( error, 0, handler );
}
totalSize += bytesRead;
info->GetChunks().push_back( ChunkInfo( chunk.offset, bytesRead, buffer ) );
if( useBuffer )
buffer = reinterpret_cast<char*>( buffer ) + bytesRead;
}
info->SetSize( totalSize );
AnyObject *resp = new AnyObject();
resp->Set( info.release() );
return QueueTask( new XRootDStatus(), resp, handler );
}
//------------------------------------------------------------------------
// VectorWrite
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::VectorWrite( const ChunkList &chunks,
ResponseHandler *handler, uint16_t timeout )
{
for( auto itr = chunks.begin(); itr != chunks.end(); ++itr )
{
auto &chunk = *itr;
ssize_t bytesWritten = pwrite( fd, chunk.buffer, chunk.length,
chunk.offset );
if( bytesWritten < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "VectorWrite: failed, file descriptor: %i, %s",
fd, strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
return QueueTask( error, 0, handler );
}
}
return QueueTask( new XRootDStatus(), 0, handler );
}
//------------------------------------------------------------------------
// WriteV
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::WriteV( uint64_t offset,
const struct iovec *iov,
int iovcnt,
ResponseHandler *handler,
uint16_t timeout )
{
iovec iovcp[iovcnt];
memcpy( iovcp, iov, sizeof( iovcp ) );
iovec *iovptr = iovcp;
ssize_t size = 0;
for( int i = 0; i < iovcnt; ++i )
size += iovptr[i].iov_len;
ssize_t bytesWritten = 0;
while( bytesWritten < size )
{
#ifdef __APPLE__
ssize_t ret = lseek( fd, offset, SEEK_SET );
if( ret >= 0 )
ret = writev( fd, iovptr, iovcnt );
#else
ssize_t ret = pwritev( fd, iovptr, iovcnt, offset );
#endif
if( ret < 0 )
{
Log *log = DefaultEnv::GetLog();
log->Error( FileMsg, "WriteV: failed %s", strerror( errno ) );
XRootDStatus *error = new XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
return QueueTask( error, 0, handler );
}
bytesWritten += ret;
while( ret )
{
if( size_t( ret ) > iovptr[0].iov_len )
{
ret -= iovptr[0].iov_len;
--iovcnt;
++iovptr;
}
else
{
iovptr[0].iov_len -= ret;
iovptr[0].iov_base = reinterpret_cast<char*>( iovptr[0].iov_base ) + ret;
ret = 0;
}
}
}
return QueueTask( new XRootDStatus(), 0, handler );
}
//------------------------------------------------------------------------
// Fcntl
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Fcntl( const Buffer &arg,
ResponseHandler *handler, uint16_t timeout )
{
return XRootDStatus( stError, errNotSupported );
}
//------------------------------------------------------------------------
// Visa
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::Visa( ResponseHandler *handler,
uint16_t timeout )
{
return XRootDStatus( stError, errNotSupported );
}
//------------------------------------------------------------------------
// QueueTask - queues error/success tasks for all operations.
// Must always return stOK.
// Is always creating the same HostList containing only localhost.
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::QueueTask( XRootDStatus *st, AnyObject *resp,
ResponseHandler *handler )
{
// if it is simply the sync handler we can release the semaphore
// and return there is no need to execute this in the thread-pool
SyncResponseHandler *syncHandler =
dynamic_cast<SyncResponseHandler*>( handler );
if( syncHandler )
{
syncHandler->HandleResponse( st, resp );
return XRootDStatus();
}
HostList *hosts = pHostList.empty() ? 0 : new HostList( pHostList );
LocalFileTask *task = new LocalFileTask( st, resp, hosts, handler );
jmngr->QueueJob( task );
return XRootDStatus();
}
//------------------------------------------------------------------------
// MkdirPath - creates the folders specified in file_path
// called if kXR_mkdir flag is set
//------------------------------------------------------------------------
XRootDStatus LocalFileHandler::MkdirPath( const std::string &path )
{
// first find the most up-front component that exists
size_t pos = path.rfind( '/' );
while( pos != std::string::npos && pos != 0 )
{
std::string tmp = path.substr( 0, pos );
struct stat st;
int rc = lstat( tmp.c_str(), &st );
if( rc == 0 ) break;
if( errno != ENOENT )
return XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
pos = path.rfind( '/', pos - 1 );
}
pos = path.find( '/', pos + 1 );
while( pos != std::string::npos && pos != 0 )
{
std::string tmp = path.substr( 0, pos );
if( mkdir( tmp.c_str(), 0755 ) )
{
if( errno != EEXIST )
return XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
}
pos = path.find( '/', pos + 1 );
}
return XRootDStatus();
}
XRootDStatus LocalFileHandler::OpenImpl( const std::string &url, uint16_t flags,
uint16_t mode, AnyObject *&resp)
{
Log *log = DefaultEnv::GetLog();
// safe the file URL for the HostList for later
pUrl = url;
URL fileUrl( url );
if( !fileUrl.IsValid() )
return XRootDStatus( stError, errInvalidArgs );
if( fileUrl.GetHostName() != "localhost" )
return XRootDStatus( stError, errNotSupported );
std::string path = fileUrl.GetPath();
//---------------------------------------------------------------------
// Prepare Flags
//---------------------------------------------------------------------
uint16_t openflags = 0;
if( flags & kXR_new )
openflags |= O_CREAT | O_EXCL;
if( flags & kXR_open_wrto )
openflags |= O_WRONLY;
else if( flags & kXR_open_updt )
openflags |= O_RDWR;
else
openflags |= O_RDONLY;
if( flags & kXR_delete )
openflags |= O_CREAT | O_TRUNC;
if( flags & kXR_mkdir )
{
XRootDStatus st = MkdirPath( path );
if( !st.IsOK() )
{
log->Error( FileMsg, "Open MkdirPath failed %s: %s", path.c_str(),
strerror( st.errNo ) );
return st;
}
}
//---------------------------------------------------------------------
// Open File
//---------------------------------------------------------------------
if( mode == Access::Mode::None)
mode = 0600;
fd = open( path.c_str(), openflags, mode );
if( fd == -1 )
{
log->Error( FileMsg, "Open: open failed: %s: %s", path.c_str(),
strerror( errno ) );
return XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
}
//---------------------------------------------------------------------
// Stat File and cache statInfo in openInfo
//---------------------------------------------------------------------
struct stat ssp;
if( fstat( fd, &ssp ) == -1 )
{
log->Error( FileMsg, "Open: stat failed." );
return XRootDStatus( stError, errErrorResponse,
XProtocol::mapError( errno ),
strerror( errno ) );
}
std::ostringstream data;
data << ssp.st_dev << " " << ssp.st_size << " " << ssp.st_mode << " "
<< ssp.st_mtime;
StatInfo *statInfo = new StatInfo();
if( !statInfo->ParseServerResponse( data.str().c_str() ) )
{
log->Error( FileMsg, "Open: ParseServerResponse failed." );
delete statInfo;
return XRootDStatus( stError, errErrorResponse, kXR_FSError );
}
// add the URL to hosts list
pHostList.push_back( HostInfo( pUrl, false ) );
//All went well
uint32_t ufd = fd;
OpenInfo *openInfo = new OpenInfo( (uint8_t*)&ufd, 1, statInfo );
resp = new AnyObject();
resp->Set( openInfo );
return XRootDStatus();
}
}