void load_struct_from_settings(aux::session_settings const& current, session_settings& ret)
{
for (int i = 0; i < settings_pack::num_string_settings; ++i)
{
if (str_settings[i].offset == 0) continue;
std::string& val = *(std::string*)(((char*)&ret) + str_settings[i].offset);
val = current.get_str(settings_pack::string_type_base + i);
}
for (int i = 0; i < settings_pack::num_int_settings; ++i)
{
if (int_settings[i].offset == 0) continue;
int& val = *(int*)(((char*)&ret) + int_settings[i].offset);
val = current.get_int(settings_pack::int_type_base + i);
}
for (int i = 0; i < settings_pack::num_bool_settings; ++i)
{
if (bool_settings[i].offset == 0) continue;
bool& val = *(bool*)(((char*)&ret) + bool_settings[i].offset);
val = current.get_bool(settings_pack::bool_type_base + i);
}
// special case for deprecated float values
ret.share_ratio_limit = float(current.get_int(settings_pack::share_ratio_limit)) / 100.f;
ret.seed_time_ratio_limit = float(current.get_int(settings_pack::seed_time_ratio_limit)) / 100.f;
ret.peer_turnover = float(current.get_int(settings_pack::peer_turnover)) / 100.f;
ret.peer_turnover_cutoff = float(current.get_int(settings_pack::peer_turnover_cutoff)) / 100.f;
}
boost::shared_ptr<settings_pack> load_pack_from_struct(
aux::session_settings const& current, session_settings const& s)
{
boost::shared_ptr<settings_pack> p = boost::make_shared<settings_pack>();
for (int i = 0; i < settings_pack::num_string_settings; ++i)
{
if (str_settings[i].offset == 0) continue;
std::string& val = *(std::string*)(((char*)&s) + str_settings[i].offset);
int setting_name = settings_pack::string_type_base + i;
if (val == current.get_str(setting_name)) continue;
p->set_str(setting_name, val);
}
for (int i = 0; i < settings_pack::num_int_settings; ++i)
{
if (int_settings[i].offset == 0) continue;
int& val = *(int*)(((char*)&s) + int_settings[i].offset);
int setting_name = settings_pack::int_type_base + i;
if (val == current.get_int(setting_name)) continue;
p->set_int(setting_name, val);
}
for (int i = 0; i < settings_pack::num_bool_settings; ++i)
{
if (bool_settings[i].offset == 0) continue;
bool& val = *(bool*)(((char*)&s) + bool_settings[i].offset);
int setting_name = settings_pack::bool_type_base + i;
if (val == current.get_bool(setting_name)) continue;
p->set_bool(setting_name, val);
}
// special case for deprecated float values
int val = current.get_int(settings_pack::share_ratio_limit);
if (fabs(s.share_ratio_limit - float(val) / 100.f) > 0.001f)
p->set_int(settings_pack::share_ratio_limit, s.share_ratio_limit * 100);
val = current.get_int(settings_pack::seed_time_ratio_limit);
if (fabs(s.seed_time_ratio_limit - float(val) / 100.f) > 0.001f)
p->set_int(settings_pack::seed_time_ratio_limit, s.seed_time_ratio_limit * 100);
val = current.get_int(settings_pack::peer_turnover);
if (fabs(s.peer_turnover - float(val) / 100.f) > 0.001)
p->set_int(settings_pack::peer_turnover, s.peer_turnover * 100);
val = current.get_int(settings_pack::peer_turnover_cutoff);
if (fabs(s.peer_turnover_cutoff - float(val) / 100.f) > 0.001)
p->set_int(settings_pack::peer_turnover_cutoff, s.peer_turnover_cutoff * 100);
return p;
}
void web_connection_base::add_headers(std::string& request
, aux::session_settings const& sett, bool using_proxy) const
{
request += "Host: ";
request += m_host;
if (m_first_request || m_settings.get_bool(settings_pack::always_send_user_agent)) {
request += "\r\nUser-Agent: ";
request += m_settings.get_str(settings_pack::user_agent);
}
if (!m_external_auth.empty()) {
request += "\r\nAuthorization: ";
request += m_external_auth;
} else if (!m_basic_auth.empty()) {
request += "\r\nAuthorization: Basic ";
request += m_basic_auth;
}
if (sett.get_int(settings_pack::proxy_type) == settings_pack::http_pw) {
request += "\r\nProxy-Authorization: Basic ";
request += base64encode(sett.get_str(settings_pack::proxy_username)
+ ":" + sett.get_str(settings_pack::proxy_password));
}
for (web_seed_entry::headers_t::const_iterator it = m_extra_headers.begin();
it != m_extra_headers.end(); ++it) {
request += "\r\n";
request += it->first;
request += ": ";
request += it->second;
}
if (using_proxy) {
request += "\r\nProxy-Connection: keep-alive";
}
if (m_first_request || using_proxy) {
request += "\r\nConnection: keep-alive";
}
}
void initialize_default_settings(aux::session_settings& s)
{
for (int i = 0; i < settings_pack::num_string_settings; ++i)
{
if (str_settings[i].default_value == nullptr) continue;
s.set_str(settings_pack::string_type_base + i, str_settings[i].default_value);
TORRENT_ASSERT(s.get_str(settings_pack::string_type_base + i) == str_settings[i].default_value);
}
for (int i = 0; i < settings_pack::num_int_settings; ++i)
{
s.set_int(settings_pack::int_type_base + i, int_settings[i].default_value);
TORRENT_ASSERT(s.get_int(settings_pack::int_type_base + i) == int_settings[i].default_value);
}
for (int i = 0; i < settings_pack::num_bool_settings; ++i)
{
s.set_bool(settings_pack::bool_type_base + i, bool_settings[i].default_value);
TORRENT_ASSERT(s.get_bool(settings_pack::bool_type_base + i) == bool_settings[i].default_value);
}
}
void disk_buffer_pool::set_settings(aux::session_settings const& sett)
{
std::unique_lock<std::mutex> l(m_pool_mutex);
int const cache_size = sett.get_int(settings_pack::cache_size);
if (cache_size < 0)
{
std::int64_t phys_ram = total_physical_ram();
if (phys_ram == 0) m_max_use = 1024;
else
{
// this is the logic to calculate the automatic disk cache size
// based on the amount of physical RAM.
// The more physical RAM, the smaller portion of it is allocated
// for the cache.
// we take a 40th of everything exceeding 4 GiB
// a 30th of everything exceeding 1 GiB
// and a 10th of everything below a GiB
constexpr std::int64_t gb = 1024 * 1024 * 1024;
std::int64_t result = 0;
if (phys_ram > 4 * gb)
{
result += (phys_ram - 4 * gb) / 40;
phys_ram = 4 * gb;
}
if (phys_ram > 1 * gb)
{
result += (phys_ram - 1 * gb) / 30;
phys_ram = 1 * gb;
}
result += phys_ram / 20;
m_max_use = int(result / default_block_size);
}
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4127 ) /* warning C4127: conditional expression is constant */
#endif // _MSC_VER
if (sizeof(void*) == 4)
#ifdef _MSC_VER
#pragma warning(pop)
#endif // _MSC_VER
{
// 32 bit builds should capped below 2 GB of memory, even
// when more actual ram is available, because we're still
// constrained by the 32 bit virtual address space.
m_max_use = std::min(2 * 1024 * 1024 * 3 / 4 * 1024
/ default_block_size, m_max_use);
}
}
else
{
m_max_use = cache_size;
}
m_low_watermark = m_max_use - std::max(16, sett.get_int(settings_pack::max_queued_disk_bytes) / 0x4000);
if (m_low_watermark < 0) m_low_watermark = 0;
if (m_in_use >= m_max_use && !m_exceeded_max_size)
{
m_exceeded_max_size = true;
m_trigger_cache_trim();
}
#if TORRENT_USE_ASSERTS
m_settings_set = true;
#endif
}
int unchoke_sort(std::vector<peer_connection*>& peers
, int max_upload_rate
, time_duration unchoke_interval
, aux::session_settings const& sett)
{
int upload_slots = sett.get_int(settings_pack::unchoke_slots_limit);
// ==== BitTyrant ====
//
// if we're using the bittyrant unchoker, go through all peers that
// we have unchoked already, and adjust our estimated reciprocation
// rate. If the peer has reciprocated, lower the estimate, if it hasn't,
// increase the estimate (this attempts to optimize "ROI" of upload
// capacity, by sending just enough to be reciprocated).
// For more information, see: http://bittyrant.cs.washington.edu/
if (sett.get_int(settings_pack::choking_algorithm)
== settings_pack::bittyrant_choker)
{
for (std::vector<peer_connection*>::const_iterator i = peers.begin()
, end(peers.end()); i != end; ++i)
{
peer_connection* p = *i;
if (p->is_choked() || !p->is_interesting()) continue;
if (!p->has_peer_choked())
{
// we're unchoked, we may want to lower our estimated
// reciprocation rate
p->decrease_est_reciprocation_rate();
}
else
{
// we've unchoked this peer, and it hasn't reciprocated
// we may want to increase our estimated reciprocation rate
p->increase_est_reciprocation_rate();
}
}
// if we're using the bittyrant choker, sort peers by their return
// on investment. i.e. download rate / upload rate
std::sort(peers.begin(), peers.end()
, boost::bind(&bittyrant_unchoke_compare, _1, _2));
int upload_capacity_left = max_upload_rate;
// now, figure out how many peers should be unchoked. We deduct the
// estimated reciprocation rate from our upload_capacity estimate
// until there none left
upload_slots = 0;
for (std::vector<peer_connection*>::iterator i = peers.begin()
, end(peers.end()); i != end; ++i)
{
peer_connection* p = *i;
TORRENT_ASSERT(p);
if (p->est_reciprocation_rate() > upload_capacity_left) break;
++upload_slots;
upload_capacity_left -= p->est_reciprocation_rate();
}
return upload_slots;
}
// ==== rate-based ====
//
// The rate based unchoker looks at our upload rate to peers, and find
// a balance between number of upload slots and the rate we achieve. The
// intention is to not spread upload bandwidth too thin, but also to not
// unchoke few enough peers to not be able to saturate the up-link.
// this is done by traversing the peers sorted by our upload rate to
// them in decreasing rates. For each peer we increase our threshold
// by 1 kB/s. The first peer we get to to whom we upload slower than
// the threshold, we stop and that's the number of unchoke slots we have.
if (sett.get_int(settings_pack::choking_algorithm)
== settings_pack::rate_based_choker)
{
// first reset the number of unchoke slots, because we'll calculate
// it purely based on the current state of our peers.
upload_slots = 0;
// TODO: optimize this using partial_sort or something. We don't need
// to sort the entire list
// TODO: make the comparison function a free function and move it
// into this cpp file
std::sort(peers.begin(), peers.end()
, boost::bind(&upload_rate_compare, _1, _2));
// TODO: make configurable
int rate_threshold = 1024;
for (std::vector<peer_connection*>::const_iterator i = peers.begin()
, end(peers.end()); i != end; ++i)
{
peer_connection const& p = **i;
int rate = int(p.uploaded_in_last_round()
* 1000 / total_milliseconds(unchoke_interval));
if (rate < rate_threshold) break;
++upload_slots;
// TODO: make configurable
rate_threshold += 1024;
}
++upload_slots;
}
// sorts the peers that are eligible for unchoke by download rate and
// secondary by total upload. The reason for this is, if all torrents are
// being seeded, the download rate will be 0, and the peers we have sent
// the least to should be unchoked
// we use partial sort here, because we only care about the top
// upload_slots peers.
if (sett.get_int(settings_pack::seed_choking_algorithm)
== settings_pack::round_robin)
{
int pieces = sett.get_int(settings_pack::seeding_piece_quota);
std::partial_sort(peers.begin(), peers.begin()
+ (std::min)(upload_slots, int(peers.size())), peers.end()
, boost::bind(&unchoke_compare_rr, _1, _2, pieces));
}
else if (sett.get_int(settings_pack::seed_choking_algorithm)
== settings_pack::fastest_upload)
{
std::partial_sort(peers.begin(), peers.begin()
+ (std::min)(upload_slots, int(peers.size())), peers.end()
, boost::bind(&unchoke_compare_fastest_upload, _1, _2));
}
else if (sett.get_int(settings_pack::seed_choking_algorithm)
== settings_pack::anti_leech)
{
std::partial_sort(peers.begin(), peers.begin()
+ (std::min)(upload_slots, int(peers.size())), peers.end()
, boost::bind(&unchoke_compare_anti_leech, _1, _2));
}
else
{
TORRENT_ASSERT(false && "unknown seed choking algorithm");
int pieces = sett.get_int(settings_pack::seeding_piece_quota);
std::partial_sort(peers.begin(), peers.begin()
+ (std::min)(upload_slots, int(peers.size())), peers.end()
, boost::bind(&unchoke_compare_rr, _1, _2, pieces));
}
return upload_slots;
}
void apply_pack(settings_pack const* pack, aux::session_settings& sett
, aux::session_impl* ses)
{
typedef void (aux::session_impl::*fun_t)();
std::vector<fun_t> callbacks;
for (auto const& p : pack->m_strings)
{
// disregard setting indices that are not string types
if ((p.first & settings_pack::type_mask) != settings_pack::string_type_base)
continue;
// ignore settings that are out of bounds
int const index = p.first & settings_pack::index_mask;
TORRENT_ASSERT_PRECOND(index >= 0 && index < settings_pack::num_string_settings);
if (index < 0 || index >= settings_pack::num_string_settings)
continue;
// if the value did not change, don't call the update callback
if (sett.get_str(p.first) == p.second) continue;
sett.set_str(p.first, p.second);
str_setting_entry_t const& sa = str_settings[index];
if (sa.fun && ses
&& std::find(callbacks.begin(), callbacks.end(), sa.fun) == callbacks.end())
callbacks.push_back(sa.fun);
}
for (auto const& p : pack->m_ints)
{
// disregard setting indices that are not int types
if ((p.first & settings_pack::type_mask) != settings_pack::int_type_base)
continue;
// ignore settings that are out of bounds
int const index = p.first & settings_pack::index_mask;
TORRENT_ASSERT_PRECOND(index >= 0 && index < settings_pack::num_int_settings);
if (index < 0 || index >= settings_pack::num_int_settings)
continue;
// if the value did not change, don't call the update callback
if (sett.get_int(p.first) == p.second) continue;
sett.set_int(p.first, p.second);
int_setting_entry_t const& sa = int_settings[index];
if (sa.fun && ses
&& std::find(callbacks.begin(), callbacks.end(), sa.fun) == callbacks.end())
callbacks.push_back(sa.fun);
}
for (auto const& p : pack->m_bools)
{
// disregard setting indices that are not bool types
if ((p.first & settings_pack::type_mask) != settings_pack::bool_type_base)
continue;
// ignore settings that are out of bounds
int const index = p.first & settings_pack::index_mask;
TORRENT_ASSERT_PRECOND(index >= 0 && index < settings_pack::num_bool_settings);
if (index < 0 || index >= settings_pack::num_bool_settings)
continue;
// if the value did not change, don't call the update callback
if (sett.get_bool(p.first) == p.second) continue;
sett.set_bool(p.first, p.second);
bool_setting_entry_t const& sa = bool_settings[index];
if (sa.fun && ses
&& std::find(callbacks.begin(), callbacks.end(), sa.fun) == callbacks.end())
callbacks.push_back(sa.fun);
}
// call the callbacks once all the settings have been applied, and
// only once per callback
for (auto const& f : callbacks)
{
(ses->*f)();
}
}
void disk_buffer_pool::set_settings(aux::session_settings const& sett)
{
mutex::scoped_lock l(m_pool_mutex);
// 0 cache_buffer_chunk_size means 'automatic' (i.e.
// proportional to the total disk cache size)
m_cache_buffer_chunk_size = sett.get_int(settings_pack::cache_buffer_chunk_size);
m_lock_disk_cache = sett.get_bool(settings_pack::lock_disk_cache);
#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
m_want_pool_allocator = sett.get_bool(settings_pack::use_disk_cache_pool);
// if there are no allocated blocks, it's OK to switch allocator
if (m_in_use == 0)
m_using_pool_allocator = m_want_pool_allocator;
#endif
#if TORRENT_HAVE_MMAP
// if we've already allocated an mmap, we can't change
// anything unless there are no allocations in use
if (m_cache_pool && m_in_use > 0) return;
#endif
// only allow changing size if we're not using mmapped
// cache, or if we're just about to turn it off
if (
#if TORRENT_HAVE_MMAP
m_cache_pool == 0 ||
#endif
sett.get_str(settings_pack::mmap_cache).empty())
{
int cache_size = sett.get_int(settings_pack::cache_size);
if (cache_size < 0)
{
boost::uint64_t phys_ram = physical_ram();
if (phys_ram == 0) m_max_use = 1024;
else m_max_use = phys_ram / 8 / m_block_size;
}
else
{
m_max_use = cache_size;
}
m_low_watermark = m_max_use - (std::max)(16, sett.get_int(settings_pack::max_queued_disk_bytes) / 0x4000);
if (m_low_watermark < 0) m_low_watermark = 0;
if (m_in_use >= m_max_use && !m_exceeded_max_size)
{
m_exceeded_max_size = true;
m_trigger_cache_trim();
}
}
#if TORRENT_USE_ASSERTS
m_settings_set = true;
#endif
#if TORRENT_HAVE_MMAP
// #error support resizing the map
if (m_cache_pool && sett.get_str(settings_pack::mmap_cache).empty())
{
TORRENT_ASSERT(m_in_use == 0);
munmap(m_cache_pool, boost::uint64_t(m_max_use) * 0x4000);
m_cache_pool = 0;
// attempt to make MacOS not flush this to disk, making close()
// block for a long time
ftruncate(m_cache_fd, 0);
close(m_cache_fd);
m_cache_fd = -1;
std::vector<int>().swap(m_free_list);
}
else if (m_cache_pool == 0 && !sett.get_str(settings_pack::mmap_cache).empty())
{
// O_TRUNC here is because we don't actually care about what's
// in the file now, there's no need to ever read that into RAM
#ifndef O_EXLOCK
#define O_EXLOCK 0
#endif
m_cache_fd = open(sett.get_str(settings_pack::mmap_cache).c_str(), O_RDWR | O_CREAT | O_EXLOCK | O_TRUNC, 0700);
if (m_cache_fd < 0)
{
if (m_post_alert)
{
error_code ec(errno, boost::system::generic_category());
m_ios.post(boost::bind(alert_callback, m_post_alert, new mmap_cache_alert(ec)));
}
}
else
{
#ifndef MAP_NOCACHE
#define MAP_NOCACHE 0
#endif
ftruncate(m_cache_fd, boost::uint64_t(m_max_use) * 0x4000);
m_cache_pool = (char*)mmap(0, boost::uint64_t(m_max_use) * 0x4000, PROT_READ | PROT_WRITE
, MAP_SHARED | MAP_NOCACHE, m_cache_fd, 0);
if (intptr_t(m_cache_pool) == -1)
{
if (m_post_alert)
{
error_code ec(errno, boost::system::generic_category());
m_ios.post(boost::bind(alert_callback, m_post_alert, new mmap_cache_alert(ec)));
}
m_cache_pool = 0;
// attempt to make MacOS not flush this to disk, making close()
// block for a long time
ftruncate(m_cache_fd, 0);
close(m_cache_fd);
m_cache_fd = -1;
}
else
{
TORRENT_ASSERT((size_t(m_cache_pool) & 0xfff) == 0);
m_free_list.reserve(m_max_use);
for (int i = 0; i < m_max_use; ++i)
m_free_list.push_back(i);
}
}
}
#endif
}