public static Block getECBlock(int timestamp) {
Block block = blockchain.getLastBlock();
if (timestamp < block.getTimestamp() - 15) {
throw new IllegalArgumentException(
"Timestamp cannot be more than 15 s earlier than last block timestamp: "
+ block.getTimestamp());
}
int distance = 0;
while (block.getTimestamp() > timestamp - Constants.EC_RULE_TERMINATOR
&& distance < Constants.EC_BLOCK_DISTANCE_LIMIT) {
block = blockchain.getBlock(block.getPreviousBlockId());
distance += 1;
}
return block;
}
public static boolean verifyFork(Transaction transaction) {
if (blockchain.getHeight() < Constants.DIGITAL_GOODS_STORE_BLOCK) {
return true;
}
if (transaction.getReferencedTransactionFullHash() != null) {
return true;
}
if (blockchain.getHeight() < Constants.EC_CHANGE_BLOCK_1) {
if (blockchain.getHeight() - transaction.getECBlockHeight()
> Constants.EC_BLOCK_DISTANCE_LIMIT) {
return false;
}
}
Block ecBlock = blockchain.getBlock(transaction.getECBlockId());
return ecBlock != null && ecBlock.getHeight() == transaction.getECBlockHeight();
}
/**
* Trim the account ledger table
*
* @param height Trim height
*/
@Override
public void trim(int height) {
if (trimKeep <= 0) return;
try (Connection con = db.getConnection();
PreparedStatement pstmt =
con.prepareStatement("DELETE FROM account_ledger WHERE height <= ?")) {
int trimHeight = Math.max(blockchain.getHeight() - trimKeep, 0);
pstmt.setInt(1, trimHeight);
pstmt.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException(e.toString(), e);
}
}
static boolean mustLogEntry(long accountId, boolean isUnconfirmed) {
//
// Must be tracking this account
//
if (!ledgerEnabled || (!trackAllAccounts && !trackAccounts.contains(accountId))) {
return false;
}
// confirmed changes only occur while processing block, and unconfirmed changes are
// only logged while processing block
if (!blockchainProcessor.isProcessingBlock()) {
return false;
}
//
// Log unconfirmed changes only when processing a block and logUnconfirmed does not equal 0
// Log confirmed changes unless logUnconfirmed equals 2
//
if (isUnconfirmed && logUnconfirmed == 0) {
return false;
}
if (!isUnconfirmed && logUnconfirmed == 2) {
return false;
}
if (trimKeep > 0 && blockchain.getHeight() <= Constants.LAST_KNOWN_BLOCK - trimKeep) {
return false;
}
//
// Don't log account changes if we are scanning the blockchain and the current height
// is less than the minimum account_ledger trim height
//
if (blockchainProcessor.isScanning()
&& trimKeep > 0
&& blockchain.getHeight() <= blockchainProcessor.getInitialScanHeight() - trimKeep) {
return false;
}
return true;
}
/**
* Create a ledger entry
*
* @param event Event
* @param eventId Event identifier
* @param accountId Account identifier
* @param holding Holding or null
* @param holdingId Holding identifier or null
* @param change Change in balance
* @param balance New balance
*/
public LedgerEntry(
LedgerEvent event,
long eventId,
long accountId,
LedgerHolding holding,
Long holdingId,
long change,
long balance) {
this.event = event;
this.eventId = eventId;
this.accountId = accountId;
this.holding = holding;
this.holdingId = holdingId;
this.change = change;
this.balance = balance;
Block block = blockchain.getLastBlock();
this.blockId = block.getId();
this.height = block.getHeight();
this.timestamp = block.getTimestamp();
}
/**
* Return the ledger entries sorted in descending insert order
*
* @param accountId Account identifier or zero if no account identifier
* @param event Ledger event or null
* @param eventId Ledger event identifier or zero if no event identifier
* @param holding Ledger holding or null
* @param holdingId Ledger holding identifier or zero if no holding identifier
* @param firstIndex First matching entry index, inclusive
* @param lastIndex Last matching entry index, inclusive
* @return List of ledger entries
*/
public static List<LedgerEntry> getEntries(
long accountId,
LedgerEvent event,
long eventId,
LedgerHolding holding,
long holdingId,
int firstIndex,
int lastIndex) {
if (!ledgerEnabled) {
return Collections.emptyList();
}
List<LedgerEntry> entryList = new ArrayList<>();
//
// Build the SELECT statement to search the entries
StringBuilder sb = new StringBuilder(128);
sb.append("SELECT * FROM account_ledger ");
if (accountId != 0 || event != null || holding != null) {
sb.append("WHERE ");
}
if (accountId != 0) {
sb.append("account_id = ? ");
}
if (event != null) {
if (accountId != 0) {
sb.append("AND ");
}
sb.append("event_type = ? ");
if (eventId != 0) sb.append("AND event_id = ? ");
}
if (holding != null) {
if (accountId != 0 || event != null) {
sb.append("AND ");
}
sb.append("holding_type = ? ");
if (holdingId != 0) sb.append("AND holding_id = ? ");
}
sb.append("ORDER BY db_id DESC ");
sb.append(DbUtils.limitsClause(firstIndex, lastIndex));
//
// Get the ledger entries
//
blockchain.readLock();
try (Connection con = Db.db.getConnection();
PreparedStatement pstmt = con.prepareStatement(sb.toString())) {
int i = 0;
if (accountId != 0) {
pstmt.setLong(++i, accountId);
}
if (event != null) {
pstmt.setByte(++i, (byte) event.getCode());
if (eventId != 0) {
pstmt.setLong(++i, eventId);
}
}
if (holding != null) {
pstmt.setByte(++i, (byte) holding.getCode());
if (holdingId != 0) {
pstmt.setLong(++i, holdingId);
}
}
DbUtils.setLimits(++i, pstmt, firstIndex, lastIndex);
try (ResultSet rs = pstmt.executeQuery()) {
while (rs.next()) {
entryList.add(new LedgerEntry(rs));
}
}
} catch (SQLException e) {
throw new RuntimeException(e.toString(), e);
} finally {
blockchain.readUnlock();
}
return entryList;
}