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wallet2: improve refresh height determination

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As reported by jaquee, the calculation could underflow for very
low heights.
Additionally, we now use the target height too.
This commit is contained in:
moneromooo-monero 2017-08-06 16:56:51 +01:00
parent ab594cfee9
commit 74597bd15a
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1 changed files with 20 additions and 3 deletions
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23
src/wallet/wallet2.cpp
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@ -2174,9 +2174,26 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const std::stri
// try asking the daemon first // try asking the daemon first
if(m_refresh_from_block_height == 0 && !recover){ if(m_refresh_from_block_height == 0 && !recover){
std::string err; std::string err;
uint64_t height = get_daemon_blockchain_height(err); uint64_t height = 0;
if (err.empty())
m_refresh_from_block_height = height - blocks_per_month; // we get the max of approximated height and known height
// approximated height is the least of daemon target height
// (the max of what the other daemons are claiming is their
// height) and the theoretical height based on the local
// clock. This will be wrong only if both the local clock
// is bad *and* a peer daemon claims a highest height than
// the real chain.
// known height is the height the local daemon is currently
// synced to, it will be lower than the real chain height if
// the daemon is currently syncing.
height = get_approximate_blockchain_height();
uint64_t target_height = get_daemon_blockchain_target_height(err);
if (err.empty() && target_height < height)
height = target_height;
uint64_t local_height = get_daemon_blockchain_height(err);
if (err.empty() && local_height > height)
height = local_height;
m_refresh_from_block_height = height >= blocks_per_month ? height - blocks_per_month : 0;
} }
if(m_refresh_from_block_height == 0 && !recover){ if(m_refresh_from_block_height == 0 && !recover){