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Merge pull request #27 from wowario/median_timestamp 

Use median timestamp if current time renders a block invalid.
This commit is contained in:
jw 2018-05-17 19:51:54 -07:00 committed by GitHub
parent 26bdc1e457 4a479d2fcc
commit 1f6760533f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 15 additions and 6 deletions
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14
src/cryptonote_core/blockchain.cpp
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@ -1141,6 +1141,12 @@ bool Blockchain::create_block_template(block& b, const account_public_address& m
b.prev_id = get_tail_id();
b.timestamp = time(NULL);
uint64_t median_ts;
if (!check_block_timestamp(b, median_ts))
{
b.timestamp = median_ts;
}
diffic = get_difficulty_for_next_block();
CHECK_AND_ASSERT_MES(diffic, false, "difficulty overhead.");
@ -3126,10 +3132,10 @@ uint64_t Blockchain::get_adjusted_time() const
}
//------------------------------------------------------------------
//TODO: revisit, has changed a bit on upstream
bool Blockchain::check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b) const
bool Blockchain::check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b, uint64_t& median_ts) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
uint64_t median_ts = epee::misc_utils::median(timestamps);
median_ts = epee::misc_utils::median(timestamps);
if(b.timestamp < median_ts)
{
@ -3147,7 +3153,7 @@ bool Blockchain::check_block_timestamp(std::vector<uint64_t>& timestamps, const
// true if the block's timestamp is not less than the timestamp of the
// median of the selected blocks
// false otherwise
bool Blockchain::check_block_timestamp(const block& b) const
bool Blockchain::check_block_timestamp(const block& b, uint64_t& median_ts) const
{
LOG_PRINT_L3("Blockchain::" << __func__);
uint64_t cryptonote_block_future_time_limit = get_current_hard_fork_version() < 7 ? CRYPTONOTE_BLOCK_FUTURE_TIME_LIMIT : CRYPTONOTE_BLOCK_FUTURE_TIME_LIMIT_V2;
@ -3173,7 +3179,7 @@ bool Blockchain::check_block_timestamp(const block& b) const
timestamps.push_back(m_db->get_block_timestamp(offset));
}
return check_block_timestamp(timestamps, b);
return check_block_timestamp(timestamps, b, median_ts);
}
//------------------------------------------------------------------
void Blockchain::return_tx_to_pool(std::vector<transaction> &txs)

7
src/cryptonote_core/blockchain.h
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@ -1291,10 +1291,12 @@ namespace cryptonote
* false otherwise
*
* @param b the block to be checked
* @param median_ts return-by-reference the median of timestamps
*
* @return true if the block's timestamp is valid, otherwise false
*/
bool check_block_timestamp(const block& b) const;
bool check_block_timestamp(const block& b, uint64_t& median_ts) const;
bool check_block_timestamp(const block& b) const { uint64_t median_ts; return check_block_timestamp(b, median_ts); }
/**
* @brief checks a block's timestamp
@ -1307,7 +1309,8 @@ namespace cryptonote
*
* @return true if the block's timestamp is valid, otherwise false
*/
bool check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b) const;
bool check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b, uint64_t& median_ts) const;
bool check_block_timestamp(std::vector<uint64_t>& timestamps, const block& b) const { uint64_t median_ts; return check_block_timestamp(timestamps, b, median_ts); }
/**
* @brief get the "adjusted time"