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Split.cpp
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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2010 NoMachine, http://www.nomachine.com/. */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of NoMachine. Redistribution and use of the present */
/* software is allowed according to terms specified in the file LICENSE */
/* which comes in the source distribution. */
/* */
/* Check http://www.nomachine.com/licensing.html for applicability. */
/* */
/* NX and NoMachine are trademarks of Medialogic S.p.A. */
/* */
/* All rights reserved. */
/* */
/**************************************************************************/
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <utime.h>
#include "Misc.h"
#include "Split.h"
#include "Control.h"
#include "Statistics.h"
#include "EncodeBuffer.h"
#include "DecodeBuffer.h"
#include "StaticCompressor.h"
#include "Unpack.h"
//
// Set the verbosity level.
//
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
#undef DUMP
//
// Define this to trace elements
// allocated and deallocated.
//
#undef REFERENCES
//
// Counters used for store control.
//
int SplitStore::totalSplitSize_;
int SplitStore::totalSplitStorageSize_;
//
// This is used for reference count.
//
#ifdef REFERENCES
int Split::references_ = 0;
#endif
Split::Split()
{
resource_ = nothing;
position_ = nothing;
store_ = NULL;
d_size_ = 0;
i_size_ = 0;
c_size_ = 0;
r_size_ = 0;
next_ = 0;
load_ = 0;
save_ = 0;
checksum_ = NULL;
state_ = split_undefined;
mode_ = split_none;
action_ = is_discarded;
#ifdef REFERENCES
references_++;
*logofs << "Split: Created new Split at "
<< this << " out of " << references_
<< " allocated references.\n" << logofs_flush;
#endif
}
Split::~Split()
{
delete [] checksum_;
#ifdef REFERENCES
references_--;
*logofs << "Split: Deleted Split at "
<< this << " out of " << references_
<< " allocated references.\n" << logofs_flush;
#endif
}
SplitStore::SplitStore(StaticCompressor *compressor, CommitStore *commits, int resource)
: compressor_(compressor), commits_(commits), resource_(resource)
{
splits_ = new T_splits();
current_ = splits_ -> end();
splitStorageSize_ = 0;
#ifdef TEST
*logofs << "SplitStore: Created new store [";
if (resource_ != nothing)
{
*logofs << resource_;
}
else
{
*logofs << "commit";
}
*logofs << "].\n" << logofs_flush;
*logofs << "SplitStore: Total messages in stores are "
<< totalSplitSize_ << " with total storage size "
<< totalSplitStorageSize_ << ".\n"
<< logofs_flush;
#endif
}
SplitStore::~SplitStore()
{
totalSplitSize_ -= splits_ -> size();
totalSplitStorageSize_ -= splitStorageSize_;
for (T_splits::iterator i = splits_ -> begin();
i != splits_ -> end(); i++)
{
delete *i;
}
delete splits_;
#ifdef TEST
*logofs << "SplitStore: Deleted store [";
if (resource_ != nothing)
{
*logofs << resource_;
}
else
{
*logofs << "commit";
}
*logofs << "] with storage size " << splitStorageSize_
<< ".\n" << logofs_flush;
*logofs << "SplitStore: Total messages in stores are "
<< totalSplitSize_ << " with total storage size "
<< totalSplitStorageSize_ << ".\n"
<< logofs_flush;
#endif
}
//
// This is called at the encoding side.
//
Split *SplitStore::add(MessageStore *store, int resource, T_split_mode mode,
int position, T_store_action action, T_checksum checksum,
const unsigned char *buffer, const int size)
{
#ifdef TEST
*logofs << "SplitStore: Adding message [" << (unsigned int) store ->
opcode() << "] resource " << resource << " mode " << mode
<< " position " << position << " action [" << DumpAction(action)
<< "] and checksum [" << DumpChecksum(checksum) << "]"
<< ".\n" << logofs_flush;
#endif
Split *split = new Split();
if (split == NULL)
{
#ifdef PANIC
*logofs << "SplitStore: PANIC! Can't allocate "
<< "memory for the split.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Can't allocate memory "
<< "for the split.\n";
HandleAbort();
}
split -> store_ = store;
split -> resource_ = resource;
split -> mode_ = mode;
split -> position_ = position;
split -> action_ = action;
split -> store_ -> validateSize(size);
//
// The checksum is not provided if the
// message is cached.
//
if (checksum != NULL)
{
split -> checksum_ = new md5_byte_t[MD5_LENGTH];
memcpy(split -> checksum_, checksum, MD5_LENGTH);
}
//
// We don't need the identity data at the
// encoding side. This qualifies the split
// as a split generated at the encoding
// side.
//
split -> i_size_ = store -> identitySize(buffer, size);
split -> d_size_ = size - split -> i_size_;
if (action == IS_ADDED || action == is_discarded)
{
//
// If the message was added to message
// store or discarded we need to save
// the real data so we can transfer it
// at later time.
//
split -> data_.resize(split -> d_size_);
memcpy(split -> data_.begin(), buffer + split -> i_size_, split -> d_size_);
//
// If the message was added, lock it so
// it will not be used by the encoding
// side until it is recomposed.
//
if (action == IS_ADDED)
{
split -> store_ -> lock(split -> position_);
#ifdef TEST
commits_ -> validate(split);
#endif
}
}
#ifdef WARNING
else
{
*logofs << "SplitStore: WARNING! Not copying data for the cached message.\n"
<< logofs_flush;
}
#endif
push(split);
return split;
}
//
// This is called at decoding side. If checksum
// is provided, the message can be searched on
// disk, then, if message is found, an event is
// sent to abort the data transfer.
//
Split *SplitStore::add(MessageStore *store, int resource, int position,
T_store_action action, T_checksum checksum,
unsigned char *buffer, const int size)
{
#ifdef TEST
*logofs << "SplitStore: Adding message ["
<< (unsigned int) store -> opcode() << "] resource "
<< resource << " position " << position << " action ["
<< DumpAction(action) << "] and checksum ["
<< DumpChecksum(checksum) << "].\n" << logofs_flush;
#endif
Split *split = new Split();
if (split == NULL)
{
#ifdef PANIC
*logofs << "SplitStore: PANIC! Can't allocate "
<< "memory for the split.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Can't allocate memory "
<< "for the split.\n";
HandleAbort();
}
split -> store_ = store;
split -> resource_ = resource;
split -> position_ = position;
split -> action_ = action;
split -> store_ -> validateSize(size);
//
// Check if the checksum was provided
// by the remote.
//
if (checksum != NULL)
{
split -> checksum_ = new md5_byte_t[MD5_LENGTH];
memcpy(split -> checksum_, checksum, MD5_LENGTH);
}
split -> i_size_ = store -> identitySize(buffer, size);
//
// Copy the identity so we can expand the
// message when it is committed.
//
split -> identity_.resize(split -> i_size_);
memcpy(split -> identity_.begin(), buffer, split -> i_size_);
split -> d_size_ = size - split -> i_size_;
if (action == IS_ADDED || action == is_discarded)
{
//
// The unpack procedure will check if the
// first 2 bytes of the buffer contain the
// pattern and will not try to expand the
// image.
//
split -> data_.resize(2);
unsigned char *data = split -> data_.begin();
data[0] = SPLIT_PATTERN;
data[1] = SPLIT_PATTERN;
//
// If the message was added to the store,
// we don't have the data part, yet, so
// we need to lock the message until it
// is recomposed.
//
if (action == IS_ADDED)
{
split -> store_ -> lock(split -> position_);
#ifdef TEST
commits_ -> validate(split);
#endif
}
}
else
{
#ifdef WARNING
*logofs << "SplitStore: WARNING! Copying data for the cached message.\n"
<< logofs_flush;
#endif
//
// We may optionally take the data from the
// message store in compressed form, but,
// as the data has been decompressed in the
// buffer, we save a further decompression.
//
split -> data_.resize(split -> d_size_);
memcpy(split -> data_.begin(), buffer + split -> i_size_, split -> d_size_);
}
push(split);
return split;
}
void SplitStore::push(Split *split)
{
splits_ -> push_back(split);
splitStorageSize_ += getNodeSize(split);
totalSplitSize_++;
totalSplitStorageSize_ += getNodeSize(split);
statistics -> addSplit();
#ifdef TEST
*logofs << "SplitStore: There are " << splits_ -> size()
<< " messages in store [" << resource_ << "] with "
<< "storage size " << splitStorageSize_ << ".\n"
<< logofs_flush;
*logofs << "SplitStore: Total messages in stores are "
<< totalSplitSize_ << " with total storage size "
<< totalSplitStorageSize_ << ".\n"
<< logofs_flush;
#endif
split -> state_ = split_added;
}
void SplitStore::dump()
{
#ifdef DUMP
int n;
Split *split;
*logofs << "SplitStore: DUMP! Dumping content of ";
if (commits_ == NULL)
{
*logofs << "[commits]";
}
else
{
*logofs << "[splits] for store [" << resource_ << "]";
}
*logofs << " with [" << getSize() << "] elements "
<< "in the store.\n" << logofs_flush;
n = 0;
for (T_splits::iterator i = splits_ -> begin(); i != splits_ -> end(); i++, n++)
{
split = *i;
*logofs << "SplitStore: DUMP! Split [" << n << "] has action ["
<< DumpAction(split -> action_) << "] state ["
<< DumpState(split -> state_) << "] ";
if (split -> resource_ >= 0)
{
*logofs << "resource " << split -> resource_;
}
*logofs << " request " << (unsigned) split -> store_ -> opcode()
<< " position " << split -> position_ << " size is "
<< split -> data_.size() << " (" << split -> d_size_
<< "/" << split -> c_size_ << "/" << split -> r_size_
<< ") with " << split -> data_.size() - split -> next_
<< "] bytes to go.\n" << logofs_flush;
}
#endif
}
int SplitStore::send(EncodeBuffer &encodeBuffer, int packetSize)
{
if (splits_ -> size() == 0)
{
#ifdef PANIC
*logofs << "SplitStore: PANIC! Function send called with no splits available.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Function send called with no splits available.\n";
HandleAbort();
}
//
// A start operation must always be executed on
// the split, even in the case the split will be
// later aborted.
//
if (current_ == splits_ -> end())
{
start(encodeBuffer);
}
//
// If we have matched the checksum received from
// the remote side then we must abort the current
// split, else we can send another block of data
// to the remote peer.
//
Split *split = *current_;
unsigned int abort = 0;
if (split -> state_ == split_loaded)
{
abort = 1;
}
encodeBuffer.encodeBoolValue(abort);
if (abort == 1)
{
#ifdef TEST
*logofs << "SplitStore: Aborting split for checksum ["
<< DumpChecksum(split -> checksum_) << "] position "
<< split -> position_ << " with " << (split ->
data_.size() - split -> next_) << " bytes to go "
<< "out of " << split -> data_.size()
<< ".\n" << logofs_flush;
#endif
statistics -> addSplitAborted();
statistics -> addSplitAbortedBytesOut(split -> data_.size() - split -> next_);
split -> next_ = split -> data_.size();
split -> state_ = split_aborted;
}
else
{
int count = (packetSize <= 0 || split -> next_ +
packetSize > (int) split -> data_.size() ?
split -> data_.size() - split -> next_ : packetSize);
#ifdef TEST
*logofs << "SplitStore: Sending split for checksum ["
<< DumpChecksum(split -> checksum_) << "] count "
<< count << " position " << split -> position_
<< ". Data size is " << split -> data_.size() << " ("
<< split -> d_size_ << "/" << split -> c_size_ << "), "
<< split -> data_.size() - (split -> next_ + count)
<< " to go.\n" << logofs_flush;
#endif
encodeBuffer.encodeValue(count, 32, 10);
encodeBuffer.encodeMemory(split -> data_.begin() + split -> next_, count);
split -> next_ += count;
}
//
// Was data completely transferred? We are the
// sending side. We must update the message in
// store, even if split was aborted.
//
if (split -> next_ != ((int) split -> data_.size()))
{
return 0;
}
//
// Move the split at the head of the
// list to the commits.
//
remove(split);
//
// Reset current position to the
// end of repository.
//
current_ = splits_ -> end();
#ifdef TEST
*logofs << "SplitStore: Removed split at head of the list. "
<< "Resource is " << split -> resource_ << " request "
<< (unsigned) split -> store_ -> opcode() << " position "
<< split -> position_ << ".\n" << logofs_flush;
#endif
return 1;
}
int SplitStore::start(EncodeBuffer &encodeBuffer)
{
//
// Get the element at the top of the
// list.
//
current_ = splits_ -> begin();
Split *split = *current_;
#ifdef TEST
*logofs << "SplitStore: Starting split for checksum ["
<< DumpChecksum(split -> checksum_) << "] position "
<< split -> position_ << " with " << (split ->
data_.size() - split -> next_) << " bytes to go "
<< "out of " << split -> data_.size()
<< ".\n" << logofs_flush;
#endif
//
// See if compression of the data part is
// enabled.
//
if (split -> store_ -> enableCompress)
{
//
// If the split is going to be aborted don't
// compress the data and go straight to the
// send. The new data size will be assumed
// from the disk cache.
//
if (split -> state_ != split_loaded)
{
unsigned int compressedSize = 0;
unsigned char *compressedData = NULL;
if (control -> LocalDataCompression &&
(compressor_ -> compressBuffer(split -> data_.begin(), split -> d_size_,
compressedData, compressedSize)))
{
//
// Replace the data with the one in
// compressed form.
//
#ifdef TEST
*logofs << "SplitStore: Split data of size " << split -> d_size_
<< " has been compressed to " << compressedSize
<< " bytes.\n" << logofs_flush;
#endif
split -> data_.clear();
split -> data_.resize(compressedSize);
memcpy(split -> data_.begin(), compressedData, compressedSize);
split -> c_size_ = compressedSize;
//
// Inform our peer that the data is
// compressed and send the new size.
//
encodeBuffer.encodeBoolValue(1);
encodeBuffer.encodeValue(compressedSize, 32, 14);
#ifdef TEST
*logofs << "SplitStore: Signaled " << split -> c_size_
<< " bytes of compressed data for this message.\n"
<< logofs_flush;
#endif
return 1;
}
}
#ifdef TEST
else
{
*logofs << "SplitStore: Not trying to compress the "
<< "loaded message.\n" << logofs_flush;
}
#endif
//
// Tell to the remote that data will
// follow uncompressed.
//
encodeBuffer.encodeBoolValue(0);
}
return 1;
}
int SplitStore::start(DecodeBuffer &decodeBuffer)
{
#ifdef TEST
*logofs << "SplitStore: Going to receive a new split from the remote side.\n"
<< logofs_flush;
#endif
//
// Get the element at the head
// of the list.
//
current_ = splits_ -> begin();
Split *split = *current_;
unsigned int compressedSize = 0;
//
// Save the data size known by the remote.
// This information will be needed if the
// remote will not have a chance to abort
// the split.
//
split -> r_size_ = split -> d_size_;
//
// Find out if data was compressed by the
// remote.
//
if (split -> store_ -> enableCompress)
{
decodeBuffer.decodeBoolValue(compressedSize);
if (compressedSize == 1)
{
//
// Get the compressed size.
//
if (control -> isProtoStep7() == 1)
{
decodeBuffer.decodeValue(compressedSize, 32, 14);
}
else
{
//
// As we can't refuse to handle the decoding
// of the split message when connected to an
// old proxy version, we need to decode this
// in a way that is compatible.
//
unsigned int diffSize;
decodeBuffer.decodeValue(diffSize, 32, 14);
split -> store_ -> lastResize += diffSize;
compressedSize = split -> store_ -> lastResize;
}
split -> store_ -> validateSize(split -> d_size_, compressedSize);
split -> r_size_ = compressedSize;
}
}
//
// Update the size if the split
// was not already loaded.
//
if (split -> state_ != split_loaded)
{
split -> data_.clear();
if (compressedSize > 0)
{
split -> c_size_ = compressedSize;
#ifdef TEST
*logofs << "SplitStore: Split data of size "
<< split -> d_size_ << " was compressed to "
<< split -> c_size_ << " bytes.\n"
<< logofs_flush;
#endif
split -> data_.resize(split -> c_size_);
}
else
{
split -> data_.resize(split -> d_size_);
}
unsigned char *data = split -> data_.begin();
data[0] = SPLIT_PATTERN;
data[1] = SPLIT_PATTERN;
}
#ifdef TEST
else
{
//
// The message had been already
// loaded from disk.
//
if (compressedSize > 0)
{
if ((int) compressedSize != split -> c_size_)
{
*logofs << "SplitStore: WARNING! Compressed data size is "
<< "different than the loaded compressed size.\n"
<< logofs_flush;
}
*logofs << "SplitStore: Ignoring the new size with "
<< "loaded compressed size " << split -> c_size_
<< ".\n" << logofs_flush;
}
}
#endif
return 1;
}
int SplitStore::receive(DecodeBuffer &decodeBuffer)
{
if (splits_ -> size() == 0)
{
#ifdef PANIC
*logofs << "SplitStore: PANIC! Function receive called with no splits available.\n"
<< logofs_flush;
#endif
cerr << "Error" << ": Function receive called with no splits available.\n";
HandleAbort();
}
if (current_ == splits_ -> end())
{
start(decodeBuffer);
}
//
// Check first if split was aborted, else add
// any new data to message being recomposed.
//
Split *split = *current_;
unsigned int abort = 0;
decodeBuffer.decodeBoolValue(abort);
if (abort == 1)
{
#ifdef TEST
*logofs << "SplitStore: Aborting split for checksum ["
<< DumpChecksum(split -> checksum_) << "] position "
<< split -> position_ << " with " << (split ->
data_.size() - split -> next_) << " bytes to go "
<< "out of " << split -> data_.size()
<< ".\n" << logofs_flush;
#endif
statistics -> addSplitAborted();
statistics -> addSplitAbortedBytesOut(split -> r_size_ - split -> next_);
split -> next_ = split -> r_size_;
split -> state_ = split_aborted;
}
else
{
//
// Get the size of the packet.
//
unsigned int count;
decodeBuffer.decodeValue(count, 32, 10);
//
// If the split was not already loaded from
// disk, decode the packet and update our
// copy of the data. The encoding side may
// have not received the abort event, yet,
// and may be unaware that the message is
// stored in compressed form at our side.
//
#ifdef TEST
*logofs << "SplitStore: Receiving split for checksum ["
<< DumpChecksum(split -> checksum_) << "] count "
<< count << " position " << split -> position_
<< ". Data size is " << split -> data_.size() << " ("
<< split -> d_size_ << "/" << split -> c_size_ << "/"
<< split -> r_size_ << "), " << split -> r_size_ -
(split -> next_ + count) << " to go.\n"
<< logofs_flush;
#endif
if (split -> next_ + count > (unsigned) split -> r_size_)
{
#ifdef PANIC
*logofs << "SplitStore: PANIC! Invalid data count "
<< count << "provided in the split.\n"
<< logofs_flush;
*logofs << "SplitStore: PANIC! While receiving split for "
<< "checksum [" << DumpChecksum(split -> checksum_)
<< "] with count " << count << " action ["
<< DumpAction(split -> action_) << "] state ["
<< DumpState(split -> state_) << "]. Data size is "
<< split -> data_.size() << " (" << split -> d_size_
<< "/" << split -> c_size_ << "), " << split ->
data_.size() - (split -> next_ + count)
<< " to go.\n" << logofs_flush;
#endif
cerr << "Error" << ": Invalid data count "
<< count << "provided in the split.\n";
HandleAbort();
}
if (split -> state_ != split_loaded)
{
#ifdef TEST
if (split -> next_ + count > split -> data_.size())
{
#ifdef PANIC
*logofs << "SplitStore: PANIC! Inconsistent split data size "
<< split -> data_.size() << " with expected size "
<< split -> r_size_ << ".\n"
<< logofs_flush;
#endif
HandleAbort();
}
#endif
memcpy(split -> data_.begin() + split -> next_,
decodeBuffer.decodeMemory(count), count);
}
else
{
#ifdef TEST
*logofs << "SplitStore: WARNING! Data discarded with split "
<< "loaded from disk.\n" << logofs_flush;
#endif
decodeBuffer.decodeMemory(count);
}
split -> next_ += count;
}
//
// Is unsplit complete?
//
if (split -> next_ != split -> r_size_)
{
return 0;
}
//
// If the persistent cache is enabled,
// we have a valid checksum and the
// split was not originally retrieved
// from disk, save the message on disk.
//
if (split -> state_ != split_loaded &&
split -> state_ != split_aborted)
{
save(split);
}
//
// Move the split at the head of the
// list to the commits.
//