danicoin/src/cryptonote_protocol/block_queue.cpp
moneromooo-monero 70b8c6d77a
cryptonote_protocol: misc fixes to the new sync algorithm
Fix sync wedge corner case:
It could happen if a connection went into standby mode, while
it was the one which had requested the next span, and that span
was still waiting for the data, and that peer is not on the
main chain. Other peers can then start asking for that data
again and again, but never get it as only that forked peer does.

And various other fixes
2017-08-21 21:57:19 +01:00

417 lines
14 KiB
C++

// Copyright (c) 2017, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include <vector>
#include <unordered_map>
#include <boost/uuid/nil_generator.hpp>
#include "cryptonote_protocol_defs.h"
#include "block_queue.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "cn.block_queue"
namespace std {
static_assert(sizeof(size_t) <= sizeof(boost::uuids::uuid), "boost::uuids::uuid too small");
template<> struct hash<boost::uuids::uuid> {
std::size_t operator()(const boost::uuids::uuid &_v) const {
return reinterpret_cast<const std::size_t &>(_v);
}
};
}
namespace cryptonote
{
void block_queue::add_blocks(uint64_t height, std::list<cryptonote::block_complete_entry> bcel, const boost::uuids::uuid &connection_id, float rate, size_t size)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
std::list<crypto::hash> hashes;
bool has_hashes = remove_span(height, &hashes);
blocks.insert(span(height, std::move(bcel), connection_id, rate, size));
if (has_hashes)
set_span_hashes(height, connection_id, hashes);
}
void block_queue::add_blocks(uint64_t height, uint64_t nblocks, const boost::uuids::uuid &connection_id, boost::posix_time::ptime time)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
blocks.insert(span(height, nblocks, connection_id, time));
}
void block_queue::flush_spans(const boost::uuids::uuid &connection_id, bool all)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
block_map::iterator i = blocks.begin();
while (i != blocks.end())
{
block_map::iterator j = i++;
if (j->connection_id == connection_id && (all || j->blocks.size() == 0))
{
blocks.erase(j);
}
}
}
void block_queue::flush_stale_spans(const std::set<boost::uuids::uuid> &live_connections)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
block_map::iterator i = blocks.begin();
if (i != blocks.end() && is_blockchain_placeholder(*i))
++i;
while (i != blocks.end())
{
block_map::iterator j = i++;
if (live_connections.find(j->connection_id) == live_connections.end() && j->blocks.size() == 0)
{
blocks.erase(j);
}
}
}
bool block_queue::remove_span(uint64_t start_block_height, std::list<crypto::hash> *hashes)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
for (block_map::iterator i = blocks.begin(); i != blocks.end(); ++i)
{
if (i->start_block_height == start_block_height)
{
if (hashes)
*hashes = std::move(i->hashes);
blocks.erase(i);
return true;
}
}
return false;
}
void block_queue::remove_spans(const boost::uuids::uuid &connection_id, uint64_t start_block_height)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
for (block_map::iterator i = blocks.begin(); i != blocks.end(); )
{
block_map::iterator j = i++;
if (j->connection_id == connection_id && j->start_block_height <= start_block_height)
{
blocks.erase(j);
}
}
}
uint64_t block_queue::get_max_block_height() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
uint64_t height = 0;
for (const auto &span: blocks)
{
const uint64_t h = span.start_block_height + span.nblocks - 1;
if (h > height)
height = h;
}
return height;
}
void block_queue::print() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
MDEBUG("Block queue has " << blocks.size() << " spans");
for (const auto &span: blocks)
MDEBUG(" " << span.start_block_height << " - " << (span.start_block_height+span.nblocks-1) << " (" << span.nblocks << ") - " << (is_blockchain_placeholder(span) ? "blockchain" : span.blocks.empty() ? "scheduled" : "filled ") << " " << span.connection_id << " (" << ((unsigned)(span.rate*10/1024.f))/10.f << " kB/s)");
}
std::string block_queue::get_overview() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (blocks.empty())
return "[]";
block_map::const_iterator i = blocks.begin();
std::string s = std::string("[") + std::to_string(i->start_block_height + i->nblocks - 1) + ":";
while (++i != blocks.end())
s += i->blocks.empty() ? "." : "o";
s += "]";
return s;
}
bool block_queue::requested(const crypto::hash &hash) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
for (const auto &span: blocks)
{
for (const auto &h: span.hashes)
if (h == hash)
return true;
}
return false;
}
std::pair<uint64_t, uint64_t> block_queue::reserve_span(uint64_t first_block_height, uint64_t last_block_height, uint64_t max_blocks, const boost::uuids::uuid &connection_id, const std::list<crypto::hash> &block_hashes, boost::posix_time::ptime time)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (last_block_height < first_block_height || max_blocks == 0)
{
MDEBUG("reserve_span: early out: first_block_height " << first_block_height << ", last_block_height " << last_block_height << ", max_blocks " << max_blocks);
return std::make_pair(0, 0);
}
uint64_t span_start_height = last_block_height - block_hashes.size() + 1;
std::list<crypto::hash>::const_iterator i = block_hashes.begin();
while (i != block_hashes.end() && requested(*i))
{
++i;
++span_start_height;
}
uint64_t span_length = 0;
std::list<crypto::hash> hashes;
while (i != block_hashes.end() && span_length < max_blocks)
{
hashes.push_back(*i);
++i;
++span_length;
}
if (span_length == 0)
return std::make_pair(0, 0);
MDEBUG("Reserving span " << span_start_height << " - " << (span_start_height + span_length - 1) << " for " << connection_id);
add_blocks(span_start_height, span_length, connection_id, time);
set_span_hashes(span_start_height, connection_id, hashes);
return std::make_pair(span_start_height, span_length);
}
bool block_queue::is_blockchain_placeholder(const span &span) const
{
static const boost::uuids::uuid uuid0 = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
return span.connection_id == uuid0;
}
std::pair<uint64_t, uint64_t> block_queue::get_start_gap_span() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (blocks.empty())
return std::make_pair(0, 0);
block_map::const_iterator i = blocks.begin();
if (!is_blockchain_placeholder(*i))
return std::make_pair(0, 0);
uint64_t current_height = i->start_block_height + i->nblocks - 1;
++i;
if (i == blocks.end())
return std::make_pair(0, 0);
uint64_t first_span_height = i->start_block_height;
if (first_span_height <= current_height + 1)
return std::make_pair(0, 0);
MDEBUG("Found gap at start of spans: last blockchain block height " << current_height << ", first span's block height " << first_span_height);
print();
return std::make_pair(current_height + 1, first_span_height - current_height - 1);
}
std::pair<uint64_t, uint64_t> block_queue::get_next_span_if_scheduled(std::list<crypto::hash> &hashes, boost::uuids::uuid &connection_id, boost::posix_time::ptime &time) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (blocks.empty())
return std::make_pair(0, 0);
block_map::const_iterator i = blocks.begin();
if (is_blockchain_placeholder(*i))
++i;
if (i == blocks.end())
return std::make_pair(0, 0);
if (!i->blocks.empty())
return std::make_pair(0, 0);
hashes = i->hashes;
connection_id = i->connection_id;
time = i->time;
return std::make_pair(i->start_block_height, i->nblocks);
}
void block_queue::set_span_hashes(uint64_t start_height, const boost::uuids::uuid &connection_id, std::list<crypto::hash> hashes)
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
for (block_map::iterator i = blocks.begin(); i != blocks.end(); ++i)
{
if (i->start_block_height == start_height && i->connection_id == connection_id)
{
span s = *i;
blocks.erase(i);
s.hashes = std::move(hashes);
blocks.insert(s);
return;
}
}
}
bool block_queue::get_next_span(uint64_t &height, std::list<cryptonote::block_complete_entry> &bcel, boost::uuids::uuid &connection_id, bool filled) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (blocks.empty())
return false;
block_map::const_iterator i = blocks.begin();
if (is_blockchain_placeholder(*i))
++i;
for (; i != blocks.end(); ++i)
{
if (!filled || !i->blocks.empty())
{
height = i->start_block_height;
bcel = i->blocks;
connection_id = i->connection_id;
return true;
}
}
return false;
}
bool block_queue::has_next_span(const boost::uuids::uuid &connection_id, bool &filled) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (blocks.empty())
return false;
block_map::const_iterator i = blocks.begin();
if (is_blockchain_placeholder(*i))
++i;
if (i == blocks.end())
return false;
if (i->connection_id != connection_id)
return false;
filled = !i->blocks.empty();
return true;
}
size_t block_queue::get_data_size() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
size_t size = 0;
for (const auto &span: blocks)
size += span.size;
return size;
}
size_t block_queue::get_num_filled_spans_prefix() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
if (blocks.empty())
return 0;
block_map::const_iterator i = blocks.begin();
if (is_blockchain_placeholder(*i))
++i;
size_t size = 0;
while (i != blocks.end() && !i->blocks.empty())
{
++i;
++size;
}
return size;
}
size_t block_queue::get_num_filled_spans() const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
size_t size = 0;
for (const auto &span: blocks)
if (!span.blocks.empty())
++size;
return size;
}
crypto::hash block_queue::get_last_known_hash(const boost::uuids::uuid &connection_id) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
crypto::hash hash = cryptonote::null_hash;
uint64_t highest_height = 0;
for (const auto &span: blocks)
{
if (span.connection_id != connection_id)
continue;
uint64_t h = span.start_block_height + span.nblocks - 1;
if (h > highest_height && span.hashes.size() == span.nblocks)
{
hash = span.hashes.back();
highest_height = h;
}
}
return hash;
}
bool block_queue::has_spans(const boost::uuids::uuid &connection_id) const
{
for (const auto &span: blocks)
{
if (span.connection_id == connection_id)
return true;
}
return false;
}
float block_queue::get_speed(const boost::uuids::uuid &connection_id) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
std::unordered_map<boost::uuids::uuid, float> speeds;
for (const auto &span: blocks)
{
if (span.blocks.empty())
continue;
// note that the average below does not average over the whole set, but over the
// previous pseudo average and the latest rate: this gives much more importance
// to the latest measurements, which is fine here
std::unordered_map<boost::uuids::uuid, float>::iterator i = speeds.find(span.connection_id);
if (i == speeds.end())
speeds.insert(std::make_pair(span.connection_id, span.rate));
else
i->second = (i->second + span.rate) / 2;
}
float conn_rate = -1, best_rate = 0;
for (auto i: speeds)
{
if (i.first == connection_id)
conn_rate = i.second;
if (i.second > best_rate)
best_rate = i.second;
}
if (conn_rate <= 0)
return 1.0f; // not found, assume good speed
if (best_rate == 0)
return 1.0f; // everything dead ? Can't happen, but let's trap anyway
const float speed = conn_rate / best_rate;
MTRACE(" Relative speed for " << connection_id << ": " << speed << " (" << conn_rate << "/" << best_rate);
return speed;
}
bool block_queue::foreach(std::function<bool(const span&)> f, bool include_blockchain_placeholder) const
{
boost::unique_lock<boost::recursive_mutex> lock(mutex);
block_map::const_iterator i = blocks.begin();
if (!include_blockchain_placeholder && i != blocks.end() && is_blockchain_placeholder(*i))
++i;
while (i != blocks.end())
if (!f(*i++))
return false;
return true;
}
}