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rust-rocksdb/test/test_iterator.rs

118 lines
4.2 KiB

use rocksdb::{DB, Direction, Options, Writable};
fn cba(input: &Box<[u8]>) -> Box<[u8]> {
input.iter().cloned().collect::<Vec<_>>().into_boxed_slice()
}
#[test]
pub fn test_iterator() {
let path = "_rust_rocksdb_iteratortest";
{
let k1: Box<[u8]> = b"k1".to_vec().into_boxed_slice();
let k2: Box<[u8]> = b"k2".to_vec().into_boxed_slice();
let k3: Box<[u8]> = b"k3".to_vec().into_boxed_slice();
let k4: Box<[u8]> = b"k4".to_vec().into_boxed_slice();
let v1: Box<[u8]> = b"v1111".to_vec().into_boxed_slice();
let v2: Box<[u8]> = b"v2222".to_vec().into_boxed_slice();
let v3: Box<[u8]> = b"v3333".to_vec().into_boxed_slice();
let v4: Box<[u8]> = b"v4444".to_vec().into_boxed_slice();
let db = DB::open_default(path).unwrap();
let p = db.put(&*k1, &*v1);
assert!(p.is_ok());
let p = db.put(&*k2, &*v2);
assert!(p.is_ok());
let p = db.put(&*k3, &*v3);
assert!(p.is_ok());
let mut view1 = db.iterator();
let expected = vec![(cba(&k1), cba(&v1)),
(cba(&k2), cba(&v2)),
(cba(&k3), cba(&v3))];
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
// Test that it's reusable a few times
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
// Test it in reverse a few times
{
let iterator1 = view1.from_end();
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = view1.from_end();
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = view1.from_end();
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = view1.from_end();
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = view1.from_end();
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
// Try it forward again
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
let p = db.put(&*k4, &*v4);
assert!(p.is_ok());
let mut view3 = db.iterator();
let expected2 = vec![(cba(&k1), cba(&v1)),
(cba(&k2), cba(&v2)),
(cba(&k3), cba(&v3)),
(cba(&k4), cba(&v4))];
{
let iterator1 = view1.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = view3.from_start();
assert_eq!(iterator1.collect::<Vec<_>>(), expected2);
}
{
let iterator1 = view3.from(b"k2", Direction::forward);
let expected = vec![(cba(&k2), cba(&v2)),
(cba(&k3), cba(&v3)),
(cba(&k4), cba(&v4))];
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = view3.from(b"k2", Direction::reverse);
let expected = vec![(cba(&k2), cba(&v2)), (cba(&k1), cba(&v1))];
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
}
let opts = Options::new();
assert!(DB::destroy(&opts, path).is_ok());
}