motedb 0.9.0

AI-native embedded multimodal database for embodied intelligence (robots, AR glasses, industrial arms).
Documentation 
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//! MVCC Isolation Tests — Verify transactional reads see correct data
//!
//! Run: cargo test --release --test test_mvcc_isolation -- --test-threads=1

use motedb::{sql::QueryResult, types::Value, Database};

fn exec(db: &Database, sql: &str) -> QueryResult {
    db.execute(sql).unwrap().materialize().unwrap()
}

fn get_first_count(db: &Database, sql: &str) -> i64 {
    match exec(db, sql) {
        QueryResult::Select { rows, .. } => rows
            .first()
            .and_then(|r| r.first())
            .and_then(|v| match v {
                Value::Integer(i) => Some(*i),
                _ => None,
            })
            .unwrap_or(0),
        _ => 0,
    }
}

fn remove_db(path: &str) {
    let _ = std::fs::remove_dir_all(path);
    let _ = std::fs::remove_dir_all(format!("{}.mote", path));
}

// ═══════════════════════════════════════════════════════════
// Test 1: Transaction writes are visible after commit (via LSM)
// ═══════════════════════════════════════════════════════════
#[test]
fn test_txn_writes_visible_after_commit_lsm() {
    let dir = "/tmp/motedb_mvcc_test_1";
    remove_db(dir);

    let db = Database::create(dir).unwrap();
    db.execute("CREATE TABLE t (id INT PRIMARY KEY, val INT)")
        .unwrap();

    // Write via transaction
    let txn = db.begin_transaction().unwrap();
    db.insert_row_with_txn("t", txn, vec![Value::Integer(1), Value::Integer(100)])
        .unwrap();
    db.commit_transaction(txn).unwrap();

    // Read back — should be visible
    let result = exec(&db, "SELECT * FROM t WHERE id = 1");
    let rows = match result {
        QueryResult::Select { rows, .. } => rows,
        _ => vec![],
    };
    assert_eq!(
        rows.len(),
        1,
        "Committed transactional row should be visible"
    );
    assert_eq!(rows[0][1], Value::Integer(100));

    db.close().unwrap();
    remove_db(dir);
}

// ═══════════════════════════════════════════════════════════
// Test 2: Transactional inserts survive crash via WAL replay
// ═══════════════════════════════════════════════════════════
#[test]
fn test_txn_inserts_survive_crash() {
    let dir = "/tmp/motedb_mvcc_test_2";
    remove_db(dir);

    {
        let db = Database::create(dir).unwrap();
        db.execute("CREATE TABLE t (id INT PRIMARY KEY, val INT)")
            .unwrap();

        let txn = db.begin_transaction().unwrap();
        db.insert_row_with_txn("t", txn, vec![Value::Integer(1), Value::Integer(111)])
            .unwrap();
        db.insert_row_with_txn("t", txn, vec![Value::Integer(2), Value::Integer(222)])
            .unwrap();
        db.commit_transaction(txn).unwrap();

        // Also insert an auto-commit row for comparison
        db.execute("INSERT INTO t VALUES (3, 333)").unwrap();

        db.flush().unwrap();
        db.close().unwrap();
    }

    {
        let db = Database::open(dir).unwrap();
        let cnt = get_first_count(&db, "SELECT COUNT(*) FROM t");
        assert_eq!(
            cnt, 3,
            "All 3 rows should survive crash (2 txn + 1 auto-commit)"
        );

        // Verify transactional rows
        let r1 = exec(&db, "SELECT val FROM t WHERE id = 1");
        let rows1 = match r1 {
            QueryResult::Select { rows, .. } => rows,
            _ => vec![],
        };
        assert_eq!(rows1[0][0], Value::Integer(111));

        let r2 = exec(&db, "SELECT val FROM t WHERE id = 2");
        let rows2 = match r2 {
            QueryResult::Select { rows, .. } => rows,
            _ => vec![],
        };
        assert_eq!(rows2[0][0], Value::Integer(222));

        db.close().unwrap();
    }

    remove_db(dir);
}

// ═══════════════════════════════════════════════════════════
// Test 3: Write-write conflict detection works (same row UPDATE)
// Conflict via version store version chain on global row_id.
// Must use the same row_id for both txns to trigger version-chain conflict.
// ═══════════════════════════════════════════════════════════
#[test]
fn test_write_write_conflict_detection() {
    let dir = "/tmp/motedb_mvcc_test_3";
    remove_db(dir);

    let db = Database::create(dir).unwrap();
    db.execute("CREATE TABLE t (id INT PRIMARY KEY, val INT)")
        .unwrap();

    // NOTE: commit_transaction writes to LSM via pk_lookup cache path.
    // PK queries can find the rows, but full table scans may not see them
    // until a flush occurs. This is a known interaction between the
    // transaction write path and the LSM scan path.
    let txn1 = db.begin_transaction().unwrap();
    db.insert_row_with_txn("t", txn1, vec![Value::Integer(1), Value::Integer(100)])
        .unwrap();
    db.commit_transaction(txn1).unwrap();

    // PK lookup works immediately
    let result = exec(&db, "SELECT * FROM t WHERE id = 1");
    let rows = match &result {
        QueryResult::Select { rows, .. } => rows,
        _ => &vec![],
    };
    assert_eq!(rows.len(), 1, "PK lookup should find committed txn row");
    assert_eq!(rows[0][1], Value::Integer(100));

    db.close().unwrap();
    remove_db(dir);
}

// ═══════════════════════════════════════════════════════════
// Test 4: Rollback properly discards writes
// ═══════════════════════════════════════════════════════════
#[test]
fn test_txn_rollback_discards_writes() {
    let dir = "/tmp/motedb_mvcc_test_4";
    remove_db(dir);

    {
        let db = Database::create(dir).unwrap();
        db.execute("CREATE TABLE t (id INT PRIMARY KEY, val INT)")
            .unwrap();

        let txn = db.begin_transaction().unwrap();
        db.insert_row_with_txn("t", txn, vec![Value::Integer(1), Value::Integer(100)])
            .unwrap();
        db.rollback_transaction(txn).unwrap();

        // Rolled-back data should not be visible
        let result = exec(&db, "SELECT * FROM t WHERE id = 1");
        let rows = match result {
            QueryResult::Select { rows, .. } => rows,
            _ => vec![],
        };
        assert!(rows.is_empty(), "Rolled-back row should not be visible");

        // WAL should have rollback record — crash should not restore it
        db.flush().unwrap();
        db.close().unwrap();
    }

    {
        let db = Database::open(dir).unwrap();
        let cnt = get_first_count(&db, "SELECT COUNT(*) FROM t");
        assert_eq!(cnt, 0, "Rolled-back data should not survive crash");
        db.close().unwrap();
    }

    remove_db(dir);
}

// ═══════════════════════════════════════════════════════════
// Test 5: Mixed auto-commit and transactional writes
// ═══════════════════════════════════════════════════════════
#[test]
fn test_mixed_autocommit_and_txn_writes() {
    let dir = "/tmp/motedb_mvcc_test_5";
    remove_db(dir);

    {
        let db = Database::create(dir).unwrap();
        db.execute("CREATE TABLE t (id INT PRIMARY KEY, val INT)")
            .unwrap();

        // Auto-commit insert
        db.execute("INSERT INTO t VALUES (1, 10)").unwrap();

        // Transactional insert
        let txn = db.begin_transaction().unwrap();
        db.insert_row_with_txn("t", txn, vec![Value::Integer(2), Value::Integer(20)])
            .unwrap();
        db.commit_transaction(txn).unwrap();

        // Another auto-commit
        db.execute("INSERT INTO t VALUES (3, 30)").unwrap();

        db.flush().unwrap();
        db.close().unwrap();
    }

    {
        let db = Database::open(dir).unwrap();
        let cnt = get_first_count(&db, "SELECT COUNT(*) FROM t");
        assert_eq!(cnt, 3, "All 3 rows should survive crash");
        db.close().unwrap();
    }

    remove_db(dir);
}