Wallet2: calculate approximate blockchain height on offline creation

Wallet API: add approximateBlockChainHeight()
This commit is contained in:
Jacob Brydolf 2016-11-10 15:36:16 +01:00
parent eb6d66e4fc
commit 4fca34ddb4
No known key found for this signature in database
GPG Key ID: DE46246550D2F3C5
5 changed files with 43 additions and 2 deletions

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@ -469,7 +469,10 @@ uint64_t WalletImpl::blockChainHeight() const
{ {
return m_wallet->get_blockchain_current_height(); return m_wallet->get_blockchain_current_height();
} }
uint64_t WalletImpl::approximateBlockChainHeight() const
{
return m_wallet->get_approximate_blockchain_height();
}
uint64_t WalletImpl::daemonBlockChainHeight() const uint64_t WalletImpl::daemonBlockChainHeight() const
{ {
std::string err; std::string err;

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@ -76,6 +76,7 @@ public:
uint64_t balance() const; uint64_t balance() const;
uint64_t unlockedBalance() const; uint64_t unlockedBalance() const;
uint64_t blockChainHeight() const; uint64_t blockChainHeight() const;
uint64_t approximateBlockChainHeight() const;
uint64_t daemonBlockChainHeight() const; uint64_t daemonBlockChainHeight() const;
uint64_t daemonBlockChainTargetHeight() const; uint64_t daemonBlockChainTargetHeight() const;
bool synchronized() const; bool synchronized() const;

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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_account_public_address = m_account.get_keys().m_account_address;
m_watch_only = false; 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); bool r = store_keys(m_keys_file, password, false);
THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file); 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; 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) void wallet2::set_tx_note(const crypto::hash &txid, const std::string &note)
{ {
m_tx_notes[txid] = note; m_tx_notes[txid] = note;

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@ -492,7 +492,10 @@ namespace tools
std::string get_daemon_address() const; std::string get_daemon_address() const;
uint64_t get_daemon_blockchain_height(std::string& err); uint64_t get_daemon_blockchain_height(std::string& err);
uint64_t get_daemon_blockchain_target_height(std::string& err); uint64_t get_daemon_blockchain_target_height(std::string& err);
/*!
* \brief Calculates the approximate blockchain height from current date/time.
*/
uint64_t get_approximate_blockchain_height() const;
std::vector<size_t> select_available_outputs_from_histogram(uint64_t count, bool atleast, bool unlocked, bool trusted_daemon); std::vector<size_t> select_available_outputs_from_histogram(uint64_t count, bool atleast, bool unlocked, bool trusted_daemon);
std::vector<size_t> select_available_outputs(const std::function<bool(const transfer_details &td)> &f); std::vector<size_t> select_available_outputs(const std::function<bool(const transfer_details &td)> &f);
std::vector<size_t> select_available_unmixable_outputs(bool trusted_daemon); std::vector<size_t> select_available_unmixable_outputs(bool trusted_daemon);

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@ -281,6 +281,12 @@ struct Wallet
*/ */
virtual uint64_t blockChainHeight() const = 0; virtual uint64_t blockChainHeight() const = 0;
/**
* @brief approximateBlockChainHeight - returns approximate blockchain height calculated from date/time
* @return
*/
virtual uint64_t approximateBlockChainHeight() const = 0;
/** /**
* @brief daemonBlockChainHeight - returns daemon blockchain height * @brief daemonBlockChainHeight - returns daemon blockchain height
* @return 0 - in case error communicating with the daemon. * @return 0 - in case error communicating with the daemon.