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optimized peer_connection by postponing diffie hellman key creation and generation of handhake until the connection has succeeded

This commit is contained in:
Marcos Pinto 2007-07-09 06:17:52 +00:00
parent 3e53b24db7
commit db50da4fc0
2 changed files with 99 additions and 72 deletions
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4
libtorrent/include/libtorrent/bt_peer_connection.hpp
View File

@ -202,7 +202,7 @@ namespace libtorrent
void write_metadata_request(std::pair<int, int> req);
void write_keepalive();
void write_dht_port(int listen_port);
void on_connected() {}
void on_connected();
void on_metadata();
#ifndef NDEBUG
@ -370,6 +370,8 @@ namespace libtorrent
bool m_sent_bitfield;
bool m_in_constructor;
bool m_sent_handshake;
#endif
};

159
libtorrent/src/bt_peer_connection.cpp
View File

@ -102,12 +102,73 @@ namespace libtorrent
#ifndef NDEBUG
, m_sent_bitfield(false)
, m_in_constructor(true)
, m_sent_handshake(false)
#endif
{
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << "*** bt_peer_connection\n";
#endif
#ifndef NDEBUG
m_in_constructor = false;
#endif
}
bt_peer_connection::bt_peer_connection(
session_impl& ses
, boost::shared_ptr<socket_type> s
, policy::peer* peerinfo)
: peer_connection(ses, s, peerinfo)
, m_state(read_protocol_identifier)
#ifndef TORRENT_DISABLE_EXTENSIONS
, m_supports_extensions(false)
#endif
, m_supports_dht_port(false)
#ifndef TORRENT_DISABLE_ENCRYPTION
, m_encrypted(false)
, m_rc4_encrypted(false)
, m_sync_bytes_read(0)
, m_enc_send_buffer(0, 0)
#endif
#ifndef NDEBUG
, m_sent_bitfield(false)
, m_in_constructor(true)
, m_sent_handshake(false)
#endif
{
// we are not attached to any torrent yet.
// we have to wait for the handshake to see
// which torrent the connector want's to connect to
// upload bandwidth will only be given to connections
// that are part of a torrent. Since this is an incoming
// connection, we have to give it some initial bandwidth
// to send the handshake.
#ifndef TORRENT_DISABLE_ENCRYPTION
m_bandwidth_limit[download_channel].assign(2048);
m_bandwidth_limit[upload_channel].assign(2048);
#else
m_bandwidth_limit[download_channel].assign(80);
m_bandwidth_limit[upload_channel].assign(80);
#endif
// start in the state where we are trying to read the
// handshake from the other side
reset_recv_buffer(20);
setup_receive();
#ifndef NDEBUG
m_in_constructor = false;
#endif
}
bt_peer_connection::~bt_peer_connection()
{
}
void bt_peer_connection::on_connected()
{
#ifndef TORRENT_DISABLE_ENCRYPTION
pe_settings::enc_policy const& out_enc_policy = m_ses.get_pe_settings().out_enc_policy;
@ -158,62 +219,6 @@ namespace libtorrent
reset_recv_buffer(20);
setup_receive();
}
#ifndef NDEBUG
m_in_constructor = false;
#endif
}
bt_peer_connection::bt_peer_connection(
session_impl& ses
, boost::shared_ptr<socket_type> s
, policy::peer* peerinfo)
: peer_connection(ses, s, peerinfo)
, m_state(read_protocol_identifier)
#ifndef TORRENT_DISABLE_EXTENSIONS
, m_supports_extensions(false)
#endif
, m_supports_dht_port(false)
#ifndef TORRENT_DISABLE_ENCRYPTION
, m_encrypted(false)
, m_rc4_encrypted(false)
, m_sync_bytes_read(0)
, m_enc_send_buffer(0, 0)
#endif
#ifndef NDEBUG
, m_sent_bitfield(false)
, m_in_constructor(true)
#endif
{
// we are not attached to any torrent yet.
// we have to wait for the handshake to see
// which torrent the connector want's to connect to
// upload bandwidth will only be given to connections
// that are part of a torrent. Since this is an incoming
// connection, we have to give it some initial bandwidth
// to send the handshake.
#ifndef TORRENT_DISABLE_ENCRYPTION
m_bandwidth_limit[download_channel].assign(2048);
m_bandwidth_limit[upload_channel].assign(2048);
#else
m_bandwidth_limit[download_channel].assign(80);
m_bandwidth_limit[upload_channel].assign(80);
#endif
// start in the state where we are trying to read the
// handshake from the other side
reset_recv_buffer(20);
setup_receive();
#ifndef NDEBUG
m_in_constructor = false;
#endif
}
bt_peer_connection::~bt_peer_connection()
{
}
void bt_peer_connection::on_metadata()
@ -226,6 +231,9 @@ namespace libtorrent
void bt_peer_connection::write_dht_port(int listen_port)
{
INVARIANT_CHECK;
assert(m_sent_handshake && m_sent_bitfield);
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << time_now_string()
<< " ==> DHT_PORT [ " << listen_port << " ]\n";
@ -282,6 +290,7 @@ namespace libtorrent
assert(!m_encrypted);
assert(!m_rc4_encrypted);
assert(!m_DH_key_exchange.get());
assert(!m_sent_handshake);
#ifdef TORRENT_VERBOSE_LOGGING
if (is_local())
@ -317,6 +326,7 @@ namespace libtorrent
assert(!m_encrypted);
assert(!m_rc4_encrypted);
assert(is_local());
assert(!m_sent_handshake);
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
@ -398,6 +408,7 @@ namespace libtorrent
assert(!m_encrypted);
assert(!m_rc4_encrypted);
assert(crypto_select == 0x02 || crypto_select == 0x01);
assert(!m_sent_handshake);
int pad_size = 0; // rand() % 512; // Keep 0 for now
@ -423,8 +434,8 @@ namespace libtorrent
#endif
}
void bt_peer_connection::write_pe_vc_cryptofield(buffer::interval& write_buf,
int crypto_field, int pad_size)
void bt_peer_connection::write_pe_vc_cryptofield(buffer::interval& write_buf
, int crypto_field, int pad_size)
{
INVARIANT_CHECK;
@ -433,6 +444,7 @@ namespace libtorrent
// vc,crypto_field,len(pad),pad, (len(ia))
assert( (write_buf.left() == 8+4+2+pad_size+2 && is_local()) ||
(write_buf.left() == 8+4+2+pad_size && !is_local()) );
assert(!m_sent_handshake);
// encrypt(vc, crypto_provide/select, len(Pad), len(IA))
// len(pad) is zero for now, len(IA) only for outgoing connections
@ -587,6 +599,11 @@ namespace libtorrent
{
INVARIANT_CHECK;
assert(!m_sent_handshake);
#ifndef NDEBUG
m_sent_handshake = true;
#endif
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
@ -1093,6 +1110,8 @@ namespace libtorrent
{
INVARIANT_CHECK;
assert(m_sent_handshake && m_sent_bitfield);
char buf[] = {0,0,0,0};
send_buffer(buf, buf + sizeof(buf));
}
@ -1100,8 +1119,8 @@ namespace libtorrent
void bt_peer_connection::write_cancel(peer_request const& r)
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
assert(associated_torrent().lock()->valid_metadata());
char buf[] = {0,0,0,13, msg_cancel};
@ -1125,8 +1144,8 @@ namespace libtorrent
void bt_peer_connection::write_request(peer_request const& r)
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
assert(associated_torrent().lock()->valid_metadata());
char buf[] = {0,0,0,13, msg_request};
@ -1153,7 +1172,7 @@ namespace libtorrent
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
assert(m_sent_bitfield == false);
assert(m_sent_handshake && !m_sent_bitfield);
assert(t->valid_metadata());
int num_pieces = bitfield.size();
@ -1243,6 +1262,7 @@ namespace libtorrent
(*m_logger) << time_now_string() << " ==> EXTENSIONS\n";
#endif
assert(m_supports_extensions);
assert(m_sent_handshake && m_sent_bitfield);
entry handshake(entry::dictionary_t);
entry extension_list(entry::dictionary_t);
@ -1297,7 +1317,8 @@ namespace libtorrent
void bt_peer_connection::write_choke()
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
if (is_choked()) return;
char msg[] = {0,0,0,1,msg_choke};
@ -1307,7 +1328,8 @@ namespace libtorrent
void bt_peer_connection::write_unchoke()
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,1,msg_unchoke};
send_buffer(msg, msg + sizeof(msg));
@ -1316,7 +1338,8 @@ namespace libtorrent
void bt_peer_connection::write_interested()
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,1,msg_interested};
send_buffer(msg, msg + sizeof(msg));
@ -1325,7 +1348,8 @@ namespace libtorrent
void bt_peer_connection::write_not_interested()
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,1,msg_not_interested};
send_buffer(msg, msg + sizeof(msg));
@ -1337,7 +1361,7 @@ namespace libtorrent
assert(associated_torrent().lock()->valid_metadata());
assert(index >= 0);
assert(index < associated_torrent().lock()->torrent_file().num_pieces());
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
const int packet_size = 9;
char msg[packet_size] = {0,0,0,5,msg_have};
@ -1349,7 +1373,8 @@ namespace libtorrent
void bt_peer_connection::write_piece(peer_request const& r, char const* buffer)
{
INVARIANT_CHECK;
assert(m_sent_bitfield == true);
assert(m_sent_handshake && m_sent_bitfield);
const int packet_size = 4 + 5 + 4 + r.length;