nut 0.1.4

Bolt DB Port in Rust
Documentation 
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use std::sync::atomic::Ordering;

use crate::bucket::{tests::bucket_mock, Bucket};
use crate::consts::Flags;
use crate::page::{LeafPageElement, OwnedPage};
use crate::tx::tests::tx_mock;
use crate::tx::WeakTx;

use super::{Node, NodeBuilder};

pub(crate) fn node_mock(bucket: *const Bucket) -> Node {
    NodeBuilder::new(bucket).build()
}

#[test]
fn create() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.put(b"baz", b"baz", [1, 22, 3].to_vec(), 0, 0);
    n.put(b"foo", b"foo", b"barack".to_vec(), 0, 0);
    n.put(b"bar", b"bar", b"bill".to_vec(), 0, 0);
    n.put(b"foo", b"fold", b"donald".to_vec(), 0, 1);

    let inodes = n.0.inodes.borrow();
    assert_eq!(inodes.len(), 3);

    assert_eq!(inodes[0].key, b"bar");
    assert_eq!(inodes[0].value, b"bill".to_vec());

    assert_eq!(inodes[1].key, b"baz");
    assert_eq!(inodes[1].value, [1, 22, 3].to_vec());

    assert_eq!(inodes[2].key, b"fold");
    assert_eq!(inodes[2].value, b"donald".to_vec());
}

#[test]
fn read_page() {
    let mut page = {
        let mut page = OwnedPage::new(1024);
        page.id = 1;
        page.overflow = 0;
        page.flags = Flags::LEAVES;
        page.count = 2;
        page
    };
    {
        let nodes = unsafe {
            std::slice::from_raw_parts_mut(page.get_data_mut_ptr() as *mut LeafPageElement, 3)
        };
        nodes[0] = LeafPageElement {
            flags: 0,
            pos: 32,
            ksize: 3,
            vsize: 4,
        };
        nodes[1] = LeafPageElement {
            flags: 0,
            pos: 23,
            ksize: 10,
            vsize: 3,
        };

        let data = unsafe {
            std::slice::from_raw_parts_mut(&mut nodes[2] as *mut LeafPageElement as *mut u8, 1024)
        };
        data[..7].copy_from_slice(b"barfooz");
        data[7..7 + 13].copy_from_slice(b"helloworldbye");
    }

    assert!(
        std::mem::size_of::<LeafPageElement>() == 16,
        "{}",
        std::mem::size_of::<LeafPageElement>()
    );

    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.read(&page);
    let inodes = n.0.inodes.borrow();

    assert!(n.is_leaf());
    assert_eq!(inodes.len(), 2);
    assert_eq!(inodes[0].key, b"bar");
    assert_eq!(inodes[0].value, b"fooz");
    assert_eq!(inodes[1].key, b"helloworld");
    assert_eq!(inodes[1].value, b"bye");
}

#[test]
fn write_page() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    n.put(
        b"susy",
        b"susy",
        b"que".to_vec(),
        0,
        Flags::LEAVES.bits() as u32,
    );
    n.put(
        b"ricki",
        b"ricki",
        b"lake".to_vec(),
        0,
        Flags::LEAVES.bits() as u32,
    );
    n.put(
        b"john",
        b"john",
        b"johnson".to_vec(),
        0,
        Flags::LEAVES.bits() as u32,
    );

    let mut page = {
        let mut page = OwnedPage::new(4096);
        page.id = 1;
        page.overflow = 0;
        page.flags = Flags::LEAVES;
        page
    };
    n.write(&mut page);

    let nodes = unsafe {
        std::slice::from_raw_parts_mut(page.get_data_mut_ptr() as *mut LeafPageElement, 3)
    };
    assert_eq!(nodes[0].ksize, 4);
    assert_eq!(nodes[0].vsize, 7);
    assert_eq!(nodes[0].pos, 48);
    assert_eq!(nodes[1].ksize, 5);
    assert_eq!(nodes[1].vsize, 4);
    assert_eq!(nodes[1].pos, 43);
    assert_eq!(nodes[2].ksize, 4);
    assert_eq!(nodes[2].vsize, 3);
    assert_eq!(nodes[2].pos, 36);

    let mut n2 = node_mock(&bucket);
    n2.read(&page);
    let inodes = n2.0.inodes.borrow();
    assert!(n2.is_leaf());
    assert_eq!(inodes.len(), 3);
    assert_eq!(inodes[0].key, b"john",);
    assert_eq!(inodes[0].value, b"johnson");
    assert_eq!(inodes[1].key, b"ricki");
    assert_eq!(inodes[1].value, b"lake");
    assert_eq!(inodes[2].key, b"susy");
    assert_eq!(inodes[2].value, b"que");
}

#[test]
fn split_two() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    n.put(b"00000001", b"00000001", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000003", b"00000003", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000004", b"00000004", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000005", b"00000005", b"0123456701234567".to_vec(), 0, 0);

    // Split between 2 & 3.
    let next = n.split_two(100).unwrap();

    assert!(next.is_some());
}

#[test]
fn split_two_fail() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    n.put(b"00000001", b"00000001", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000003", b"00000003", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000004", b"00000004", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000005", b"00000005", b"0123456701234567".to_vec(), 0, 0);

    // Split between 2 & 3.
    let next = n.split_two(4096).unwrap();

    assert!(next.is_none());
}

#[test]
fn split() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    n.put(b"00000001", b"00000001", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000003", b"00000003", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000004", b"00000004", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000005", b"00000005", b"0123456701234567".to_vec(), 0, 0);

    // Split between 2 & 3.
    let parent = n.split(100).unwrap();

    assert!(parent.is_some());
    let parent = parent.unwrap();
    let pchildren = parent.0.children.borrow();
    assert_eq!(pchildren.len(), 2);
    assert_eq!(pchildren[1].0.inodes.borrow().len(), 3);
    assert_eq!(pchildren[0].0.inodes.borrow().len(), 2);
}

#[test]
fn split_big() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    for i in 1..1000 {
        let key = format!("{i:08}");
        n.put(
            key.as_bytes(),
            key.as_bytes(),
            b"0123456701234567".to_vec(),
            0,
            0,
        );
    }

    let parent = n.split(4096).unwrap().unwrap();

    assert_eq!(parent.0.children.borrow().len(), 19);
}

#[test]
fn split_min_keys() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    n.put(b"00000001", b"00000001", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);

    let parent = n.split(20).unwrap();
    assert!(parent.is_none());
}

#[test]
fn split_single_page() {
    let tx = tx_mock();
    let bucket = bucket_mock(WeakTx::from(&tx));
    let mut n = node_mock(&bucket);
    n.0.is_leaf.store(true, Ordering::Release);
    n.put(b"00000001", b"00000001", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);
    n.put(b"00000002", b"00000002", b"0123456701234567".to_vec(), 0, 0);

    let parent = n.split(4096).unwrap();
    assert!(parent.is_none());
}