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114 lines
4.4 KiB
114 lines
4.4 KiB
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#include <algorithm>
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#include <boost/thread/locks.hpp>
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#include <boost/thread/mutex.hpp>
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#include "cryptonote_core/cryptonote_core.h"
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namespace cryptonote
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{
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namespace rpc
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{
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namespace
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{
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output_distribution_data
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process_distribution(bool cumulative, std::uint64_t start_height, std::vector<std::uint64_t> distribution, std::uint64_t base)
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{
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if (!cumulative && !distribution.empty())
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{
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for (std::size_t n = distribution.size() - 1; 0 < n; --n)
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distribution[n] -= distribution[n - 1];
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distribution[0] -= base;
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}
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return {std::move(distribution), start_height, base};
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}
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}
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boost::optional<output_distribution_data>
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RpcHandler::get_output_distribution(const std::function<bool(uint64_t, uint64_t, uint64_t, uint64_t&, std::vector<uint64_t>&, uint64_t&)> &f, uint64_t amount, uint64_t from_height, uint64_t to_height, const std::function<crypto::hash(uint64_t)> &get_hash, bool cumulative, uint64_t blockchain_height)
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{
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static struct D
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{
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boost::mutex mutex;
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std::vector<std::uint64_t> cached_distribution;
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std::uint64_t cached_from, cached_to, cached_start_height, cached_base;
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crypto::hash cached_m10_hash;
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crypto::hash cached_top_hash;
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bool cached;
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D(): cached_from(0), cached_to(0), cached_start_height(0), cached_base(0), cached_m10_hash(crypto::null_hash), cached_top_hash(crypto::null_hash), cached(false) {}
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} d;
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const boost::unique_lock<boost::mutex> lock(d.mutex);
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crypto::hash top_hash = crypto::null_hash;
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if (d.cached_to < blockchain_height)
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top_hash = get_hash(d.cached_to);
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if (d.cached && amount == 0 && d.cached_from == from_height && d.cached_to == to_height && d.cached_top_hash == top_hash)
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return process_distribution(cumulative, d.cached_start_height, d.cached_distribution, d.cached_base);
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std::vector<std::uint64_t> distribution;
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std::uint64_t start_height, base;
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// see if we can extend the cache - a common case
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bool can_extend = d.cached && amount == 0 && d.cached_from == from_height && to_height > d.cached_to && top_hash == d.cached_top_hash;
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if (!can_extend)
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{
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// we kept track of the hash 10 blocks below, if it exists, so if it matches,
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// we can still pop the last 10 cached slots and try again
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if (d.cached && amount == 0 && d.cached_from == from_height && d.cached_to - d.cached_from >= 10 && to_height > d.cached_to - 10)
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{
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crypto::hash hash10 = get_hash(d.cached_to - 10);
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if (hash10 == d.cached_m10_hash)
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{
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d.cached_to -= 10;
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d.cached_top_hash = hash10;
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d.cached_m10_hash = crypto::null_hash;
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CHECK_AND_ASSERT_MES(d.cached_distribution.size() >= 10, boost::none, "Cached distribution size does not match cached bounds");
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for (int p = 0; p < 10; ++p)
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d.cached_distribution.pop_back();
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can_extend = true;
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}
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}
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}
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if (can_extend)
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{
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std::vector<std::uint64_t> new_distribution;
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if (!f(amount, d.cached_to + 1, to_height, start_height, new_distribution, base))
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return boost::none;
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distribution = d.cached_distribution;
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distribution.reserve(distribution.size() + new_distribution.size());
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for (const auto &e: new_distribution)
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distribution.push_back(e);
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start_height = d.cached_start_height;
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base = d.cached_base;
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}
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else
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{
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if (!f(amount, from_height, to_height, start_height, distribution, base))
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return boost::none;
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}
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if (to_height > 0 && to_height >= from_height)
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{
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const std::uint64_t offset = std::max(from_height, start_height);
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if (offset <= to_height && to_height - offset + 1 < distribution.size())
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distribution.resize(to_height - offset + 1);
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}
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if (amount == 0)
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{
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d.cached_from = from_height;
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d.cached_to = to_height;
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d.cached_top_hash = get_hash(d.cached_to);
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d.cached_m10_hash = d.cached_to >= 10 ? get_hash(d.cached_to - 10) : crypto::null_hash;
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d.cached_distribution = distribution;
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d.cached_start_height = start_height;
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d.cached_base = base;
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d.cached = true;
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}
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return process_distribution(cumulative, start_height, std::move(distribution), base);
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}
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} // rpc
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} // cryptonote
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