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|
use rusqlite::{params, Connection};
pub fn init_db(conn: &Connection) {
conn.execute(
"CREATE TABLE IF NOT EXISTS users (
username TEXT PRIMARY KEY,
hashed_password TEXT NOT NULL,
account_id INTEGER UNIQUE,
balance INTEGER DEFAULT 1000
)",
[],
)
.unwrap();
// Add column if not exists (for migration)
let _ = conn.execute("ALTER TABLE users ADD COLUMN account_id INTEGER UNIQUE", []);
let _ = conn.execute(
"ALTER TABLE users ADD COLUMN balance INTEGER DEFAULT 1000",
[],
);
conn.execute(
"CREATE TABLE IF NOT EXISTS plays (
session_id TEXT PRIMARY KEY,
username TEXT NOT NULL,
game_type TEXT NOT NULL,
bet_amount INTEGER NOT NULL,
winnings INTEGER NOT NULL,
balance_after INTEGER NOT NULL,
details TEXT NOT NULL DEFAULT '{}',
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
)",
[],
)
.unwrap();
}
pub fn add_user(
conn: &Connection,
username: &str,
hashed_password: &str,
) -> Result<(), Box<dyn std::error::Error>> {
if get_hashed_password(conn, username).is_some() {
return Err("user already exists".into());
}
for _ in 0..10 {
let account_id: u32 = rand::random::<u32>();
match conn.execute(
"INSERT INTO users (username, hashed_password, account_id, balance)
VALUES (?1, ?2, ?3, ?4)",
params![username, hashed_password, account_id as i64, 1000i64],
) {
Ok(_) => return Ok(()),
Err(rusqlite::Error::SqliteFailure(error, _))
if error.code == rusqlite::ErrorCode::ConstraintViolation =>
{
continue;
}
Err(error) => return Err(Box::new(error)),
}
}
Err("could not allocate a unique account id".into())
}
pub fn get_hashed_password(conn: &Connection, username: &str) -> Option<String> {
let mut stmt = conn
.prepare("SELECT hashed_password FROM users WHERE username = ?1")
.unwrap();
let mut rows = stmt.query([username]).unwrap();
if let Ok(Some(row)) = rows.next() {
row.get(0).ok()
} else {
None
}
}
pub fn set_hashed_password(
conn: &Connection,
username: &str,
hashed_password: &str,
) -> rusqlite::Result<()> {
conn.execute(
"UPDATE users SET hashed_password = ?1 WHERE username = ?2",
params![hashed_password, username],
)?;
Ok(())
}
pub fn get_account_id(conn: &Connection, username: &str) -> Option<i64> {
let mut stmt = conn
.prepare("SELECT account_id FROM users WHERE username = ?1")
.unwrap();
let mut rows = stmt.query([username]).unwrap();
if let Ok(Some(row)) = rows.next() {
Some(row.get::<_, i64>(0).ok()?)
} else {
None
}
}
pub fn get_balance(conn: &Connection, username: &str) -> Option<i64> {
let mut stmt = conn
.prepare("SELECT balance FROM users WHERE username = ?1")
.unwrap();
let mut rows = stmt.query([username]).unwrap();
if let Ok(Some(row)) = rows.next() {
Some(row.get::<_, i64>(0).ok()?)
} else {
None
}
}
/// Settle one play and record its audit row in a single transaction.
///
/// `details` is a JSON object with game-specific fields (reels, cards,
/// winning number, crash point, ...). All SQL is parameterized: usernames are
/// data, never part of the statement text.
///
/// Returns the balance after the play.
#[allow(clippy::too_many_arguments)]
pub fn apply_play(
conn: &mut Connection,
session_id: &str,
username: &str,
game_type: &str,
bet_amount: i64,
winnings: i64,
details: &str,
) -> rusqlite::Result<i64> {
let tx = conn.transaction()?;
let deducted = tx.execute(
"UPDATE users SET balance = balance - ?1
WHERE username = ?2 AND balance >= ?1",
params![bet_amount, username],
)?;
if deducted != 1 {
return Err(rusqlite::Error::QueryReturnedNoRows);
}
tx.execute(
"UPDATE users SET balance = balance + ?1 WHERE username = ?2",
params![winnings, username],
)?;
let balance_after: i64 = tx.query_row(
"SELECT balance FROM users WHERE username = ?1",
[username],
|row| row.get(0),
)?;
tx.execute(
"INSERT INTO plays
(session_id, username, game_type, bet_amount, winnings,
balance_after, details)
VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)",
params![
session_id,
username,
game_type,
bet_amount,
winnings,
balance_after,
details
],
)?;
tx.commit()?;
Ok(balance_after)
}
pub fn count_plays(conn: &Connection, username: &str) -> i64 {
conn.query_row(
"SELECT COUNT(*) FROM plays WHERE username = ?1",
[username],
|row| row.get(0),
)
.unwrap_or(0)
}
/// Reserve a bet before a multi-step hand starts.
pub fn debit(conn: &mut Connection, username: &str, amount: i64) -> rusqlite::Result<i64> {
let tx = conn.transaction()?;
let updated = tx.execute(
"UPDATE users SET balance = balance - ?1
WHERE username = ?2 AND balance >= ?1",
params![amount, username],
)?;
if updated != 1 {
return Err(rusqlite::Error::QueryReturnedNoRows);
}
let balance = tx.query_row(
"SELECT balance FROM users WHERE username = ?1",
[username],
|row| row.get(0),
)?;
tx.commit()?;
Ok(balance)
}
/// Put a reserved bet back (disconnect or cancel).
pub fn credit(conn: &mut Connection, username: &str, amount: i64) -> rusqlite::Result<i64> {
let tx = conn.transaction()?;
tx.execute(
"UPDATE users SET balance = balance + ?1 WHERE username = ?2",
params![amount, username],
)?;
let balance = tx.query_row(
"SELECT balance FROM users WHERE username = ?1",
[username],
|row| row.get(0),
)?;
tx.commit()?;
Ok(balance)
}
/// Settle a hand whose bet was already reserved: credit winnings, write the
/// audit row, and return the new balance.
#[allow(clippy::too_many_arguments)]
pub fn settle_play(
conn: &mut Connection,
session_id: &str,
username: &str,
game_type: &str,
bet_amount: i64,
winnings: i64,
details: &str,
) -> rusqlite::Result<i64> {
let tx = conn.transaction()?;
tx.execute(
"UPDATE users SET balance = balance + ?1 WHERE username = ?2",
params![winnings, username],
)?;
let balance_after: i64 = tx.query_row(
"SELECT balance FROM users WHERE username = ?1",
[username],
|row| row.get(0),
)?;
tx.execute(
"INSERT INTO plays
(session_id, username, game_type, bet_amount, winnings,
balance_after, details)
VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)",
params![
session_id,
username,
game_type,
bet_amount,
winnings,
balance_after,
details
],
)?;
tx.commit()?;
Ok(balance_after)
}
|
