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Fix refresh height estimation 

Since commit b0426d4c refresh height for a newly created wallet
connected to a sync'd daemon was off by a month. Now we only use
the 1 month safety margin if we're unable to talk to a daemon.
This commit is contained in:
Howard Chu 2018-02-16 14:15:41 +00:00
parent ef91d6e61e
commit f3b74e75b0
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GPG Key ID: FD2A70B44AB11BA7
1 changed files with 16 additions and 13 deletions
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29
src/wallet/wallet2.cpp
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@ -2846,16 +2846,9 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const epee::wip
m_multisig_threshold = 0; m_multisig_threshold = 0;
m_multisig_signers.clear(); m_multisig_signers.clear();
// -1 month for fluctuations in block time and machine date/time setup. // calculate a starting refresh height
// avg seconds per block
const int seconds_per_block = DIFFICULTY_TARGET_V2;
// ~num blocks per month
const uint64_t blocks_per_month = 60*60*24*30/seconds_per_block;
// try asking the daemon first
if(m_refresh_from_block_height == 0 && !recover){ if(m_refresh_from_block_height == 0 && !recover){
uint64_t height = estimate_blockchain_height(); m_refresh_from_block_height = estimate_blockchain_height();
m_refresh_from_block_height = height >= blocks_per_month ? height - blocks_per_month : 0;
} }
if (!wallet_.empty()) if (!wallet_.empty())
@ -2890,20 +2883,30 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const epee::wip
std::string err; std::string err;
uint64_t height = 0; uint64_t height = 0;
// we get the max of approximated height and known height // we get the max of approximated height and local height.
// approximated height is the least of daemon target height // approximated height is the least of daemon target height
// (the max of what the other daemons are claiming is their // (the max of what the other daemons are claiming is their
// height) and the theoretical height based on the local // height) and the theoretical height based on the local
// clock. This will be wrong only if both the local clock // clock. This will be wrong only if both the local clock
// is bad *and* a peer daemon claims a highest height than // is bad *and* a peer daemon claims a highest height than
// the real chain. // the real chain.
// known height is the height the local daemon is currently // local height is the height the local daemon is currently
// synced to, it will be lower than the real chain height if // synced to, it will be lower than the real chain height if
// the daemon is currently syncing. // the daemon is currently syncing.
// If we use the approximate height we subtract one month as
// a safety margin.
height = get_approximate_blockchain_height(); height = get_approximate_blockchain_height();
uint64_t target_height = get_daemon_blockchain_target_height(err); uint64_t target_height = get_daemon_blockchain_target_height(err);
if (err.empty() && target_height < height) if (err.empty()) {
height = target_height; if (target_height < height)
height = target_height;
} else {
// if we couldn't talk to the daemon, check safety margin.
if (height > blocks_per_month)
height -= blocks_per_month;
else
height = 0;
}
uint64_t local_height = get_daemon_blockchain_height(err); uint64_t local_height = get_daemon_blockchain_height(err);
if (err.empty() && local_height > height) if (err.empty() && local_height > height)
height = local_height; height = local_height;