chisel-storage 1.0.0

Transactional slot-based storage engine with shadow paging
Documentation 
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mod common;
use chisel::ChiselError;
use common::{open_chisel, Backing};

fn test_begin_allocate_commit_read_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let handle = db.allocate(b"hello world").unwrap();
    db.commit().unwrap();
    let data = db.read(handle).unwrap();
    assert_eq!(data, b"hello world");
}

dual_backing_test!(
    test_begin_allocate_commit_read,
    test_begin_allocate_commit_read_body
);

fn test_rollback_discards_changes_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let handle = db.allocate(b"doomed").unwrap();
    db.rollback().unwrap();
    assert!(
        matches!(db.read(handle), Err(ChiselError::InvalidHandle(_))),
        "rolled-back handle must be InvalidHandle"
    );
}

dual_backing_test!(
    test_rollback_discards_changes,
    test_rollback_discards_changes_body
);

fn test_update_preserves_handle_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let handle = db.allocate(b"original").unwrap();
    db.commit().unwrap();
    db.begin().unwrap();
    db.update(handle, b"updated value").unwrap();
    db.commit().unwrap();
    let data = db.read(handle).unwrap();
    assert_eq!(data, b"updated value");
}

dual_backing_test!(
    test_update_preserves_handle,
    test_update_preserves_handle_body
);

fn test_delete_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let handle = db.allocate(b"gone soon").unwrap();
    db.commit().unwrap();
    db.begin().unwrap();
    db.delete(handle).unwrap();
    db.commit().unwrap();
    assert!(
        matches!(db.read(handle), Err(ChiselError::InvalidHandle(_))),
        "deleted handle must be InvalidHandle"
    );
}

dual_backing_test!(test_delete, test_delete_body);

fn test_savepoint_rollback_to_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let h1 = db.allocate(b"kept").unwrap();
    db.savepoint("alpha").unwrap();
    let h2 = db.allocate(b"discarded").unwrap();
    db.rollback_to("alpha").unwrap();
    db.commit().unwrap();
    assert_eq!(db.read(h1).unwrap(), b"kept");
    assert!(
        matches!(db.read(h2), Err(ChiselError::InvalidHandle(_))),
        "handle rolled back via savepoint must be InvalidHandle"
    );
}

dual_backing_test!(test_savepoint_rollback_to, test_savepoint_rollback_to_body);

fn test_savepoint_release_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let h1 = db.allocate(b"first").unwrap();
    db.savepoint("alpha").unwrap();
    let h2 = db.allocate(b"second").unwrap();
    db.release("alpha").unwrap();
    db.commit().unwrap();
    assert_eq!(db.read(h1).unwrap(), b"first");
    assert_eq!(db.read(h2).unwrap(), b"second");
}

dual_backing_test!(test_savepoint_release, test_savepoint_release_body);

fn test_savepoint_rollback_preserves_savepoint_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    db.savepoint("retry").unwrap();
    let _h1 = db.allocate(b"attempt 1").unwrap();
    db.rollback_to("retry").unwrap();
    let h2 = db.allocate(b"attempt 2").unwrap();
    db.commit().unwrap();
    assert_eq!(db.read(h2).unwrap(), b"attempt 2");
}

dual_backing_test!(
    test_savepoint_rollback_preserves_savepoint,
    test_savepoint_rollback_preserves_savepoint_body
);

fn test_nested_savepoints_body(b: &Backing) {
    let mut db = open_chisel(b);
    db.begin().unwrap();
    let h1 = db.allocate(b"base").unwrap();
    db.savepoint("alpha").unwrap();
    let h2 = db.allocate(b"in alpha").unwrap();
    db.savepoint("beta").unwrap();
    let h3 = db.allocate(b"in beta").unwrap();
    db.rollback_to("alpha").unwrap();
    db.commit().unwrap();
    assert_eq!(db.read(h1).unwrap(), b"base");
    assert!(
        matches!(db.read(h2), Err(ChiselError::InvalidHandle(_))),
        "h2 rolled back via alpha savepoint must be InvalidHandle"
    );
    assert!(
        matches!(db.read(h3), Err(ChiselError::InvalidHandle(_))),
        "h3 rolled back via alpha savepoint must be InvalidHandle"
    );
}

dual_backing_test!(test_nested_savepoints, test_nested_savepoints_body);

// Note: test_reopen_preserves_data (which exercised TransactionManager /
// PageCache / PageIo directly to verify the open_existing path)
// migrated 2026-05-22 to src/transaction.rs as `reopen_preserves_committed_data`
// under the I35 pub→pub(crate) reshape. The Chisel-public-API equivalent
// (open path + commit + reopen + read) is covered by `test_chisel_reopen`
// in tests/basic_ops.rs.