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xdelta_client.cpp
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xdelta_client.cpp
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/*
* Copyright (C) 2013- yeyouqun@163.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License along
* with this program; if not, visit the http://fsf.org website.
*/
#include <string>
#include <set>
#include <algorithm>
#include <assert.h>
#include <list>
#ifdef _WIN32
#include <functional>
#include <hash_map>
#else
#include <unistd.h>
#include <memory>
#include <ext/functional>
#if !defined (__CXX_11__)
#include <ext/hash_map>
#else
#include <unordered_map>
#endif
#include <memory.h>
#if defined (_UNIX)
#include <sys/types.h>
#include <netinet/in.h>
#include <inttypes.h>
#endif
#endif
#include "mytypes.h"
#include "buffer.h"
#include "simple_socket.h"
#include "passive_socket.h"
#include "platform.h"
#include "rw.h"
#include "rollsum.h"
#include "md4.h"
#include "xdeltalib.h"
#include "tinythread.h"
#include "reconstruct.h"
#include "multiround.h"
#include "stream.h"
#include "xdelta_server.h"
#include "xdelta_client.h"
#include "inplace.h"
namespace xdelta {
struct client_struct
{
CPassiveSocket * client_;
xdelta_observer * observer_;
client_slot_t * task_slot_;
};
struct task_struct
{
file_reader * reader_;
deletor * deletor_;
};
struct client_slot_t
{
client_slot_t () : waiting_ (false) {}
mutex lock_;
condition_variable event_;
std::list<task_struct*> tasks_;
std::vector<thread *> threads_;
bool waiting_;// task creator is waiting to finish
deletor * deletor_;
void add_task (task_struct * pto)
{
lock_guard<mutex> lg (lock_);
tasks_.push_back (pto);
}
task_struct * pop_task ()
{
lock_guard<mutex> lg (lock_);
if (tasks_.empty ())
return (task_struct*)0;
task_struct * ptask = *tasks_.begin ();
tasks_.pop_front ();
return ptask;
}
bool is_waiting () {
lock_guard<mutex> lg (lock_);
return waiting_;
}
uint32_t task_count () const
{
lock_guard<mutex> lg (const_cast<mutex&> (lock_));
return (uint32_t)tasks_.size ();
}
void wait () {
lock_.lock ();
event_.wait (lock_);
lock_.unlock ();
}
void notify_all () {
event_.notify_all ();
}
~client_slot_t ()
{
std::for_each (threads_.begin (), threads_.end (), delete_obj<thread>);
for (std::list<task_struct*>::iterator begin = tasks_.begin ();
begin != tasks_.end (); ++begin) {
deletor_->release ((*begin)->reader_);
delete *begin;
}
tasks_.clear ();
}
};
class tcp_xdelta_stream : public xdelta_stream
{
virtual void start_hash_stream (const std::string & fname, const int32_t blk_len);
virtual void add_block (const target_pos & tpos
, const uint32_t blk_len
, const uint64_t s_offset);
virtual void add_block (const uchar_t * data, const uint32_t blk_len, const uint64_t offset);
virtual void next_round (const int32_t blk_len)
{
observer_.next_round(blk_len);
}
virtual void end_one_round ();
virtual void stop_first_round ();
virtual void set_holes (std::set<hole_t> * holeset) {}
virtual void end_hash_stream (const uint64_t filsize);
virtual void on_error (const std::string & errmsg, const int errorno);
private:
CSimpleSocket & client_;
xdelta_observer & observer_;
char_buffer<uchar_t> header_buff_;
char_buffer<uchar_t> stream_buff_; // used to buffer header and data.
public:
tcp_xdelta_stream (CSimpleSocket & client, xdelta_observer & observer)
: client_ (client)
, observer_ (observer)
, header_buff_ (STACK_BUFF_LEN)
, stream_buff_ (2*1024*1024)
{}
};
void tcp_xdelta_stream::start_hash_stream (const std::string & fname, const int32_t blk_len)
{
BEGINE_HEADER (header_buff_);
END_HEADER (header_buff_, BT_XDELTA_BEGIN_BLOCK);
buffer_or_send (client_, stream_buff_, header_buff_, observer_);
observer_.start_hash_stream (fname, blk_len);
}
void tcp_xdelta_stream::add_block (const target_pos & tpos
, const uint32_t blk_len
, const uint64_t s_offset)
{
observer_.on_equal_block(blk_len, s_offset);
BEGINE_HEADER (header_buff_);
header_buff_ << tpos.index << tpos.t_offset << blk_len << s_offset;
END_HEADER (header_buff_, BT_EQUAL_BLOCK);
buffer_or_send (client_, stream_buff_, header_buff_, observer_);
}
void tcp_xdelta_stream::add_block (const uchar_t * data, const uint32_t blk_len, const uint64_t offset)
{
observer_.on_diff_block(blk_len);
header_buff_.reset();
block_header header;
header.blk_type = BT_DIFF_BLOCK;
header.blk_len = blk_len + sizeof (offset);
header_buff_ << header;
header_buff_ << offset;
buffer_or_send (client_, stream_buff_, header_buff_, observer_);
char_buffer<uchar_t> buff (const_cast<uchar_t*> (data), blk_len);
buff.wr_ptr (blk_len);
buffer_or_send (client_, stream_buff_, buff, observer_);
}
void tcp_xdelta_stream::end_one_round ()
{
BEGINE_HEADER (header_buff_);
END_HEADER (header_buff_, BT_END_ONE_ROUND);
buffer_or_send (client_, stream_buff_, header_buff_, observer_, true);
observer_.end_one_round ();
}
void tcp_xdelta_stream::stop_first_round ()
{
block_header header;
header.blk_type = BT_END_FIRST_ROUND;
header.blk_len = 0;
header_buff_ << header;
buffer_or_send (client_, stream_buff_, header_buff_, observer_, true);
return;
}
void tcp_xdelta_stream::end_hash_stream (const uint64_t filsize)
{
BEGINE_HEADER (header_buff_);
header_buff_ << filsize;
END_HEADER (header_buff_, BT_XDELTA_END_BLOCK);
buffer_or_send (client_, stream_buff_, header_buff_, observer_, true);
observer_.end_hash_stream (filsize);
}
void tcp_xdelta_stream::on_error (const std::string & errmsg, const int errorno)
{
observer_.on_error (errmsg, errorno);
}
static int receive_hash_table (CSimpleSocket & client, hasher_stream & stream, xdelta_observer & observer)
{
int error_no = 0;
DEFINE_STACK_BUFFER (data_buff);
while (true) {
data_buff.reset ();
block_header header = read_block_header (client, observer);
if (header.blk_type == BT_HASH_BLOCK) {
assert (header.blk_len != 0);
read_block (data_buff, client, header.blk_len, observer);
uint32_t fhash;
slow_hash shash;
data_buff >> fhash >> shash;
stream.add_block (fhash, shash);
}
else if (header.blk_type == BT_END_FIRST_ROUND) {
assert (header.blk_len != 0);
read_block (data_buff, client, header.blk_len, observer);
uchar_t file_hash[DIGEST_BYTES];
memcpy (file_hash, data_buff.rd_ptr (), DIGEST_BYTES);
stream.end_first_round (file_hash);
}
else if (header.blk_type == BT_BEGIN_ONE_ROUND) {
assert (header.blk_len != 0);
read_block (data_buff, client, header.blk_len, observer);
int32_t blk_len;
data_buff >> blk_len;
stream.next_round (blk_len);
}
else if (header.blk_type == BT_END_ONE_ROUND) {
stream.end_one_round ();
}
else if (header.blk_type == BT_HASH_END_BLOCK) {
read_block (data_buff, client, header.blk_len, observer);
uchar_t file_hash[DIGEST_BYTES];
memcpy (file_hash, data_buff.rd_ptr (), DIGEST_BYTES);
data_buff.rd_ptr (DIGEST_BYTES);
data_buff >> error_no;
break;
}
else {
std::string errmsg = fmt_string ("Error data format.");
THROW_XDELTA_EXCEPTION_NO_ERRNO (errmsg);
}
}
return error_no;
}
static void xdelta_multi_round (CSimpleSocket & client
, xdelta_observer & observer
, file_reader & reader
, int32_t blk_len)
{
tcp_xdelta_stream xstream (client, observer);
multiround_hasher_stream hstream (reader, &xstream, 0);
hasher_stream & hasher = hstream;
hasher.start_hash_stream (reader.get_fname (), blk_len);
try {
receive_hash_table (client, hasher, observer);
}
catch (...) {
uchar_t filhash[DIGEST_BYTES];
memset (filhash, 0, DIGEST_BYTES);
hasher.end_hash_stream (filhash, 0);
throw;
}
uchar_t filhash[DIGEST_BYTES];
memset (filhash, 0, DIGEST_BYTES);
hasher.end_hash_stream (filhash, reader.get_file_size ());
}
static int receive_hash_table (CSimpleSocket & client, hash_table & table, xdelta_observer & observer)
{
int error_no = 0;
DEFINE_STACK_BUFFER (data_buff);
table.clear ();
while (true) {
data_buff.reset ();
block_header header = read_block_header (client, observer);
if (header.blk_type == BT_HASH_BLOCK) {
assert (header.blk_len != 0);
read_block (data_buff, client, header.blk_len, observer);
uint32_t fhash;
slow_hash shash;
data_buff >> fhash >> shash;
table.add_block (fhash, shash);
}
else if (header.blk_type == BT_HASH_END_BLOCK) {
assert (header.blk_len != 0);
read_block (data_buff, client, header.blk_len, observer);
uchar_t file_hash[DIGEST_BYTES];
memcpy (file_hash, data_buff.rd_ptr (), DIGEST_BYTES);
data_buff.rd_ptr (DIGEST_BYTES);
data_buff >> error_no;
break;
}
else {
std::string errmsg = fmt_string ("Error data format.");
THROW_XDELTA_EXCEPTION_NO_ERRNO (errmsg);
}
}
return error_no;
}
static void xdelta_single_round (CSimpleSocket & client
, xdelta_observer & observer
, file_reader & reader
, int32_t blk_len)
{
hash_table table;
int error_no = receive_hash_table (client, table, observer);
if (!is_no_file_error (error_no))
return;
xdelta_hash_table htable (table, reader, blk_len);
tcp_xdelta_stream stream (client, observer);
htable.xdelta_it (stream);
return;
}
static void xdelta_inplace (CSimpleSocket & client
, xdelta_observer & observer
, file_reader & reader
, int32_t blk_len)
{
hash_table table;
int error_no = receive_hash_table (client, table, observer);
if (!is_no_file_error (error_no))
return;
xdelta_hash_table htable (table, reader, blk_len);
tcp_xdelta_stream xstream (client, observer);
in_place_stream inpstream (xstream, reader);
htable.xdelta_it (inpstream);
return;
}
static void xdelta_client_task (void * data)
{
std::auto_ptr<client_struct> autopcs ((client_struct*)data);
client_struct * pcs = autopcs.get ();
std::auto_ptr<CPassiveSocket> autosocket (pcs->client_);
CPassiveSocket & client = *autosocket.get ();
client_slot_t * slot = pcs->task_slot_;
std::auto_ptr<CActiveSocket> server;
while (true) {
server.reset (client.Accept (2));
if (server.get () == 0 &&
client.GetSocketError () == CSimpleSocket::SocketTimedout &&
(!slot->is_waiting () || slot->task_count () != 0))
continue; // continue to wait.
break;
}
if (server.get ()) {
CActiveSocket & peer = *server.get ();
DEFINE_STACK_BUFFER (buff);
while (true) {
std::auto_ptr<task_struct> pto (slot->pop_task ());
if (pto.get () == 0) {
if (!slot->is_waiting ()) {
slot->wait ();
continue;
}
break;
}
file_reader & reader = *pto->reader_;
try {
BEGINE_HEADER (buff);
buff << reader.get_fname ();
END_HEADER (buff, BT_CLIENT_FILE_BLOCK);
send_block (peer, buff, *pcs->observer_);
block_header header = read_block_header (peer, *pcs->observer_);
if (header.blk_type != BT_HASH_BEGIN_BLOCK) {
std::string errmsg = fmt_string ("Error data format(not BT_HASH_BEGIN_BLOCK).");
THROW_XDELTA_EXCEPTION_NO_ERRNO (errmsg);
}
assert (header.blk_len != 0);
buff.reset ();
read_block (buff, peer, header.blk_len, *pcs->observer_);
std::string filename;
int32_t blk_len;
uint16_t xdelta_type;
buff >> filename >> blk_len >> xdelta_type;
if (xdelta_type == INPLACE_FLAG)
xdelta_inplace (peer, *pcs->observer_, reader, blk_len);
else if (xdelta_type == MULTI_ROUND_FLAG)
xdelta_multi_round (peer, *pcs->observer_, reader, blk_len);
else if (xdelta_type == SINGLE_ROUND_FLAG)
xdelta_single_round (peer, *pcs->observer_, reader, blk_len);
else {
std::string errmsg = fmt_string ("Wrong data format %d of BT_HASH_BEGIN_BLOCK."
, (int32_t)xdelta_type);
THROW_XDELTA_EXCEPTION_NO_ERRNO (errmsg);
}
}
catch (xdelta_exception &e) {
std::string errmsg = fmt_string ("xdelta_exception when handle '%s', the error is '%s'.\n"
, reader.get_fname ().c_str (), e.what ());
pcs->observer_->on_error (errmsg, e.get_errno ());
}
catch (...) {
std::string errmsg = fmt_string ("Unknown exception when handle '%s'.\n"
, reader.get_fname ().c_str ());
pcs->observer_->on_error (errmsg, 0);
}
if (pto->deletor_)
pto->deletor_->release (pto->reader_);
}
peer.Close ();
}
client.Close ();
}
xdelta_client::xdelta_client (bool compress, uint32_t thread_nr) : client_ (compress)
, thread_nr_ (thread_nr)
, compress_ (compress)
{
task_slot_ = new client_slot_t;
}
xdelta_client::~xdelta_client ()
{
delete task_slot_;
}
void xdelta_client::run (file_operator & foperator
, xdelta_observer & observer
, const uchar_t * paddr
, uint16_t port)
{
init_active_socket (client_, paddr, port);
DEFINE_STACK_BUFFER (buff);
if (thread_nr_ == 0)
thread_nr_ = thread::hardware_concurrency () * 2;
thread_nr_ = thread_nr_ > 256 ? 256 : thread_nr_;
handshake_header hsh;
hsh.error_no = 0;
hsh.version = XDELTA_VERSION;
BEGINE_HEADER(buff);
buff << hsh;
uint32_t thread_nr = thread_nr_;
while (thread_nr > 0) {
std::auto_ptr<CPassiveSocket> client (new CPassiveSocket (compress_));
init_passive_socket (*client.get (), 0);
uint16_t data_port = client->GetServerPort ();
buff << data_port;
client_struct * pcs = new client_struct;
pcs->client_ = client.release ();
pcs->observer_ = &observer;
pcs->task_slot_ = task_slot_;
lock_guard<mutex> lg (task_slot_->lock_);
thread * thrd = new thread (xdelta_client_task, (void*)pcs);
//
// we can't call like this:
// task_slot_->threads_.push_back (new thread (xdelta_client_task, (void*)pcs))
//
task_slot_->threads_.push_back (thrd);
--thread_nr;
}
END_HEADER (buff, BT_CLIENT_BLOCK);
send_block (client_, buff, observer);
block_header header = read_block_header(client_, observer);
if (header.blk_type != BT_SERVER_BLOCK) {
wait ();
std::string errmsg = fmt_string("Error data format(not BT_SERVER_BLOCK).");
THROW_XDELTA_EXCEPTION_NO_ERRNO(errmsg);
}
hsh.init ();
buff.reset ();
read_block (buff, client_, header.blk_len, observer);
buff >> hsh;
if (hsh.error_no != 0) {
wait ();
std::string errmsg = fmt_string("Error return from server(version is %d): %d."
, hsh.version, hsh.error_no);
THROW_XDELTA_EXCEPTION_NO_ERRNO(errmsg);
}
}
void xdelta_client::add_task (file_reader * reader, deletor * pdel)
{
task_struct * task = new task_struct;
task->reader_ = reader;
task->deletor_ = pdel;
task_slot_->add_task (task);
task_slot_->notify_all ();
};
void xdelta_client::wait ()
{
task_slot_->lock_.lock ();
task_slot_->waiting_ = true;
task_slot_->lock_.unlock ();
task_slot_->event_.notify_all ();
wait_to_exit (task_slot_->threads_);
}
} //namespace xdelta