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Wallet2: calculate approximate blockchain height on offline creation

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Wallet API: add approximateBlockChainHeight()
This commit is contained in:
Jacob Brydolf
2016-11-10 15:36:16 +01:00
parent eb6d66e4fc
commit 4fca34ddb4
5 changed files with 43 additions and 2 deletions
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28
src/wallet/wallet2.cpp
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@@ -2004,6 +2004,19 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const std::stri
m_account_public_address = m_account.get_keys().m_account_address;
m_watch_only = false;
if(m_refresh_from_block_height == 0 && !recover){
// Wallets created offline don't know blockchain height.
// Set blockchain height calculated from current date/time
// -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;
uint64_t approx_blockchain_height = get_approximate_blockchain_height();
if(approx_blockchain_height > 0) {
m_refresh_from_block_height = approx_blockchain_height - blocks_per_month;
}
}
bool r = store_keys(m_keys_file, password, false);
THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file);
@@ -4578,6 +4591,21 @@ uint64_t wallet2::get_daemon_blockchain_target_height(string &err)
return resp_t.result.target_height;
}
uint64_t wallet2::get_approximate_blockchain_height() const
{
if (m_testnet) return 0;
// time of v2 fork
const time_t fork_time = 1458748658;
// v2 fork block
const uint64_t fork_block = 1009827;
// avg seconds per block
const int seconds_per_block = DIFFICULTY_TARGET_V2;
// Calculated blockchain height
uint64_t approx_blockchain_height = fork_block + (time(NULL) - fork_time)/seconds_per_block;
LOG_PRINT_L2("Calculated blockchain height: " << approx_blockchain_height);
return approx_blockchain_height;
}
void wallet2::set_tx_note(const crypto::hash &txid, const std::string &note)
{
m_tx_notes[txid] = note;