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suggestion for DHT refresh

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This commit is contained in:
Denis Ryabov 2014-07-08 01:37:34 +04:00
parent 6c4c656be4
commit 8429d95dba
2 changed files with 64 additions and 48 deletions
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17
libtorrent/include/libtorrent/kademlia/node.hpp
View File

@ -52,6 +52,9 @@ POSSIBILITY OF SUCH DAMAGE.
#include <boost/cstdint.hpp>
#include <boost/ref.hpp>
#include <boost/random.hpp>
#include <boost/nondet_random.hpp>
#include <boost/random/mersenne_twister.hpp>
#include "libtorrent/socket.hpp"
@ -118,18 +121,20 @@ struct torrent_entry
struct dht_storage_item
{
// FIXME: optimize so bdecode is not needed all the time
dht_storage_item() : p(), sig_p(), sig_user(), local_add_time(0) {}
dht_storage_item() : p(), sig_p(), sig_user(), local_add_time(0), confirmed(false), next_refresh_time(0) {}
dht_storage_item(std::string const &_p, lazy_entry const *_sig_p, lazy_entry const *_sig_user)
: p(_p), sig_p(_sig_p->string_value()), sig_user(_sig_user->string_value()),
local_add_time(0) {}
local_add_time(0), confirmed(false), next_refresh_time(0) {}
dht_storage_item(std::string const &_p, std::string const &_sig_p, std::string const &_sig_user)
: p(_p), sig_p(_sig_p), sig_user(_sig_user), local_add_time(0) {}
: p(_p), sig_p(_sig_p), sig_user(_sig_user), local_add_time(0), confirmed(false), next_refresh_time(0) {}
std::string p;
std::string sig_p;
std::string sig_user;
boost::int64_t local_add_time;
// the last time we heard about this
//ptime last_seen;
bool confirmed;
ptime next_refresh_time;
};
@ -300,14 +305,16 @@ private:
ptime m_last_tracker_tick;
ptime m_next_storage_refresh;
int m_refresh_per_tick;
std::pair<node_id, int> m_last_refreshed_item;
// secret random numbers used to create write tokens
int m_secret[2];
alert_dispatcher* m_post_alert;
udp_socket_interface* m_sock;
boost::mt19937 m_random_seed;
boost::uniform_real<> m_random_dist;
boost::variate_generator<boost::mt19937&, boost::uniform_real<> > m_random;
};

95
libtorrent/src/kademlia/node.cpp
View File

@ -107,9 +107,10 @@ node_impl::node_impl(alert_dispatcher* alert_disp
, m_rpc(m_id, m_table, sock, observer)
, m_last_tracker_tick(time_now())
, m_next_storage_refresh(time_now())
, m_last_refreshed_item()
, m_post_alert(alert_disp)
, m_sock(sock)
, m_random_dist(0.0, 1.0)
, m_random(m_random_seed, m_random_dist)
{
m_secret[0] = random();
m_secret[1] = std::rand();
@ -308,6 +309,11 @@ namespace
}
}
void putData_confirm(dht_storage_item& item)
{
item.confirmed = true;
}
void putData_fun(std::vector<std::pair<node_entry, std::string> > const& v,
node_impl& node,
entry const &p, std::string const &sig_p, std::string const &sig_user)
@ -535,22 +541,17 @@ static void processEntryForHashtags(lazy_entry &p)
bool node_impl::refresh_storage() {
bool did_something = false;
bool refresh_next_item = false;
int num_refreshable = 0;
for (dht_storage_table_t::const_iterator i = m_storage_table.begin(),
ptime const now = time_now();
m_next_storage_refresh = now + minutes(10);
for (dht_storage_table_t::iterator i = m_storage_table.begin(),
end(m_storage_table.end()); i != end; ++i )
{
dht_storage_list_t const& lsto = i->second;
dht_storage_list_t::const_iterator j(lsto.begin()), jEnd(lsto.end());
dht_storage_list_t& lsto = i->second;
dht_storage_list_t::iterator j(lsto.begin()), jEnd(lsto.end());
for(int jIdx = 0; j != jEnd; ++j, ++jIdx ) {
dht_storage_item const& item = *j;
if( std::make_pair(i->first,jIdx) == m_last_refreshed_item ) {
refresh_next_item = true;
num_refreshable++;
continue;
}
dht_storage_item& item = *j;
#ifdef ENABLE_DHT_ITEM_EXPIRE
if( has_expired(item, true) ) {
@ -558,6 +559,13 @@ bool node_impl::refresh_storage() {
}
#endif
if( item.next_refresh_time > now ) {
if( m_next_storage_refresh > item.next_refresh_time ) {
m_next_storage_refresh = item.next_refresh_time;
}
continue;
}
lazy_entry p;
int pos;
error_code err;
@ -577,11 +585,7 @@ bool node_impl::refresh_storage() {
// refresh only signed single posts and mentions
if( !multi || (multi && resource == "mention") ||
(multi && item.local_add_time && item.local_add_time + 60*60*24*2 > time(NULL)) ) {
num_refreshable++;
if( refresh_next_item && m_refresh_per_tick ) {
--m_refresh_per_tick;
m_last_refreshed_item = std::make_pair(i->first,jIdx);
#ifdef TORRENT_DHT_VERBOSE_LOGGING
printf("node dht: refreshing storage: [%s,%s,%s]\n",
username.c_str(),
@ -589,39 +593,29 @@ bool node_impl::refresh_storage() {
target->dict_find_string_value("t").c_str());
#endif
processEntryForHashtags(p);
processEntryForHashtags(p);
entry entryP;
entryP = p; // lazy to non-lazy
entry entryP;
entryP = p; // lazy to non-lazy
// search for nodes with ids close to id or with peers
// for info-hash id. then send putData to them.
boost::intrusive_ptr<dht_get> ta(new dht_get(*this, username, resource, multi,
boost::bind(&nop),
boost::bind(&putData_fun, _1, boost::ref(*this),
entryP, item.sig_p, item.sig_user), true));
ta->start();
did_something = true;
// search for nodes with ids close to id or with peers
// for info-hash id. then send putData to them.
boost::intrusive_ptr<dht_get> ta(new dht_get(*this, username, resource, multi,
boost::bind(&putData_confirm, item),
boost::bind(&putData_fun, _1, boost::ref(*this),
entryP, item.sig_p, item.sig_user), !item.confirmed));
ta->start();
did_something = true;
// add 10% diffusion to next refresh time
item.next_refresh_time = now + minutes(item.confirmed ? 60 : 1) * (1. + 0.1 * (2. * m_random() - 1.));
if( m_next_storage_refresh > item.next_refresh_time ) {
m_next_storage_refresh = item.next_refresh_time;
}
}
}
}
if( !did_something && m_storage_table.size() ) {
m_last_refreshed_item = std::make_pair(m_storage_table.begin()->first,0);
}
const time_duration tickInterval = seconds(5);
const time_duration fullRefreshInterval = minutes(30);
const time_duration sleepInterval = minutes(10);
const time_duration sleepToRefresh = std::min( sleepInterval, fullRefreshInterval / (num_refreshable ? num_refreshable : 1) );
m_next_storage_refresh = time_now() + sleepToRefresh;
if( sleepToRefresh > tickInterval ) {
m_refresh_per_tick = 1;
} else {
m_refresh_per_tick = tickInterval.diff/sleepToRefresh.diff;
}
/*
printf("node dht: next storage refresh in %s\n",
boost::posix_time::to_simple_string(sleepToRefresh).c_str() );
@ -704,6 +698,8 @@ bool node_impl::save_storage(entry &save) const {
entry_item["sig_user"] = item.sig_user;
if( item.local_add_time )
entry_item["local_add_time"] = item.local_add_time;
if( item.confirmed )
entry_item["confirmed"] = item.confirmed ? 0 : 1;
save_list.list().push_back(entry_item);
}
}
@ -720,6 +716,8 @@ void node_impl::load_storage(entry const* e) {
if( !e || e->type() != entry::dictionary_t)
return;
ptime now = time_now();
printf("node dht: loading storage... (%lu node_id keys)\n", e->dict().size());
for (entry::dictionary_type::const_iterator i = e->dict().begin();
@ -738,6 +736,13 @@ void node_impl::load_storage(entry const* e) {
entry const *local_add_time( j->find_key("local_add_time") );
if(local_add_time)
item.local_add_time = local_add_time->integer();
entry const *confirmed( j->find_key("confirmed") );
if(confirmed) {
item.confirmed = (bool) confirmed->integer();
} else {
// compatibility with twister 0.9.22 and below
item.confirmed = true;
}
// just for printf for now
bool expired = has_expired(item);
@ -751,6 +756,9 @@ void node_impl::load_storage(entry const* e) {
int ret = lazy_bdecode(item.p.data(), item.p.data() + item.p.size(), p, err, &pos, 10, 500);
processEntryForHashtags(p);
// randomize refresh time
item.next_refresh_time = now + minutes(item.confirmed ? 60 : 1) * m_random();
to_add.push_back(item);
#ifdef ENABLE_DHT_ITEM_EXPIRE
}
@ -1493,6 +1501,7 @@ void node_impl::incoming_request(msg const& m, entry& e)
void node_impl::store_dht_item(dht_storage_item &item, const big_number &target,
bool multi, int seq, int height, std::pair<char const*, int> &bufv)
{
item.next_refresh_time = time_now() + minutes(item.confirmed ? 60 : 1);
dht_storage_table_t::iterator i = m_storage_table.find(target);
if (i == m_storage_table.end()) {
// make sure we don't add too many items