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Merge pull request #2833

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b0426d4c Fixes #759 Add sanity check on restore height (Cifrado)
This commit is contained in:
Riccardo Spagni
2017-12-02 09:25:53 +02:00
parent b0c63ceb73 b0426d4cf2
commit 81fb832082
3 changed files with 44 additions and 20 deletions
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src/wallet/wallet2.cpp
+33 -20
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@@ -2476,26 +2476,7 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const std::stri
// try asking the daemon first
if(m_refresh_from_block_height == 0 && !recover){
std::string err;
uint64_t height = 0;
// 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;
uint64_t height = estimate_blockchain_height();
m_refresh_from_block_height = height >= blocks_per_month ? height - blocks_per_month : 0;
}
@@ -2514,6 +2495,38 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const std::stri
return retval;
}
uint64_t wallet2::estimate_blockchain_height()
{
// -1 month for fluctuations in block time and machine date/time setup.
// 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
std::string err;
uint64_t height = 0;
// 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;
return height;
}
/*!
* \brief Creates a watch only wallet from a public address and a view secret key.
* \param wallet_ Name of wallet file