2019-03-08 18:23:31 -08:00
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//! Functions for querying information in the data database.
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use rusqlite::Connection;
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use std::path::Path;
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2019-03-08 18:53:38 -08:00
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use zcash_primitives::transaction::components::Amount;
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2019-03-08 18:23:31 -08:00
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2019-03-08 18:53:38 -08:00
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use crate::{
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error::{Error, ErrorKind},
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get_target_and_anchor_heights,
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};
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2019-03-08 18:23:31 -08:00
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/// Returns the address for the account.
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///
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/// # Examples
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///
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/// ```
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/// use zcash_client_sqlite::query::get_address;
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///
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/// let addr = get_address("/path/to/data.db", 0);
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/// ```
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pub fn get_address<P: AsRef<Path>>(db_data: P, account: u32) -> Result<String, Error> {
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let data = Connection::open(db_data)?;
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let addr = data.query_row(
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"SELECT address FROM accounts
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WHERE account = ?",
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&[account],
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|row| row.get(0),
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)?;
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Ok(addr)
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}
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2019-03-08 18:53:38 -08:00
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/// Returns the balance for the account, including all mined unspent notes that we know
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/// about.
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///
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/// # Examples
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///
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/// ```
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/// use zcash_client_sqlite::query::get_balance;
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///
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/// let addr = get_balance("/path/to/data.db", 0);
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/// ```
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pub fn get_balance<P: AsRef<Path>>(db_data: P, account: u32) -> Result<Amount, Error> {
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let data = Connection::open(db_data)?;
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let balance = data.query_row(
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"SELECT SUM(value) FROM received_notes
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INNER JOIN transactions ON transactions.id_tx = received_notes.tx
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WHERE account = ? AND spent IS NULL AND transactions.block IS NOT NULL",
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&[account],
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|row| row.get(0).or(Ok(0)),
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)?;
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match Amount::from_i64(balance) {
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Ok(amount) if !amount.is_negative() => Ok(amount),
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_ => Err(Error(ErrorKind::CorruptedData(
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"Sum of values in received_notes is out of range",
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))),
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}
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}
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/// Returns the verified balance for the account, which ignores notes that have been
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/// received too recently and are not yet deemed spendable.
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///
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/// # Examples
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///
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/// ```
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/// use zcash_client_sqlite::query::get_verified_balance;
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///
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/// let addr = get_verified_balance("/path/to/data.db", 0);
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/// ```
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pub fn get_verified_balance<P: AsRef<Path>>(db_data: P, account: u32) -> Result<Amount, Error> {
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let data = Connection::open(db_data)?;
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let (_, anchor_height) = get_target_and_anchor_heights(&data)?;
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let balance = data.query_row(
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"SELECT SUM(value) FROM received_notes
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INNER JOIN transactions ON transactions.id_tx = received_notes.tx
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WHERE account = ? AND spent IS NULL AND transactions.block <= ?",
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&[account, anchor_height],
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|row| row.get(0).or(Ok(0)),
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)?;
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match Amount::from_i64(balance) {
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Ok(amount) if !amount.is_negative() => Ok(amount),
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_ => Err(Error(ErrorKind::CorruptedData(
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"Sum of values in received_notes is out of range",
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))),
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}
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}
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#[cfg(test)]
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mod tests {
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use tempfile::NamedTempFile;
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use zcash_primitives::{
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transaction::components::Amount,
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zip32::{ExtendedFullViewingKey, ExtendedSpendingKey},
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};
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use super::{get_address, get_balance, get_verified_balance};
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use crate::{
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error::ErrorKind,
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init::{init_accounts_table, init_data_database},
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};
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#[test]
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fn empty_database_has_no_balance() {
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let data_file = NamedTempFile::new().unwrap();
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let db_data = data_file.path();
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init_data_database(&db_data).unwrap();
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// Add an account to the wallet
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let extsk = ExtendedSpendingKey::master(&[]);
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let extfvks = [ExtendedFullViewingKey::from(&extsk)];
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init_accounts_table(&db_data, &extfvks).unwrap();
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// The account should be empty
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assert_eq!(get_balance(db_data, 0).unwrap(), Amount::zero());
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// The account should have no verified balance, as we haven't scanned any blocks
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let e = get_verified_balance(db_data, 0).unwrap_err();
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match e.kind() {
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ErrorKind::ScanRequired => (),
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_ => panic!("Unexpected error: {:?}", e),
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}
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// An invalid account has zero balance
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assert!(get_address(db_data, 1).is_err());
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assert_eq!(get_balance(db_data, 1).unwrap(), Amount::zero());
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}
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}
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