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rust-rocksdb/test/test_iterator.rs

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6.3 KiB

// Copyright 2014 Tyler Neely
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
use rocksdb::{DB, Direction, IteratorMode, 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";
{
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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();
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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());
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let expected = vec![(cba(&k1), cba(&v1)),
(cba(&k2), cba(&v2)),
(cba(&k3), cba(&v3))];
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
// Test that it's idempotent
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
// Test it in reverse a few times
{
let iterator1 = db.iterator(IteratorMode::End);
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = db.iterator(IteratorMode::End);
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = db.iterator(IteratorMode::End);
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = db.iterator(IteratorMode::End);
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
{
let iterator1 = db.iterator(IteratorMode::End);
let mut tmp_vec = iterator1.collect::<Vec<_>>();
tmp_vec.reverse();
assert_eq!(tmp_vec, expected);
}
// Try it forward again
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
let old_iterator = db.iterator(IteratorMode::Start);
let p = db.put(&*k4, &*v4);
assert!(p.is_ok());
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let expected2 = vec![(cba(&k1), cba(&v1)),
(cba(&k2), cba(&v2)),
(cba(&k3), cba(&v3)),
(cba(&k4), cba(&v4))];
{
assert_eq!(old_iterator.collect::<Vec<_>>(), expected);
}
{
let iterator1 = db.iterator(IteratorMode::Start);
assert_eq!(iterator1.collect::<Vec<_>>(), expected2);
}
{
let iterator1 = db.iterator(IteratorMode::From(b"k2",
Direction::Forward));
9 years ago
let expected = vec![(cba(&k2), cba(&v2)),
(cba(&k3), cba(&v3)),
(cba(&k4), cba(&v4))];
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = db.iterator(IteratorMode::From(b"k2",
Direction::Reverse));
let expected = vec![(cba(&k2), cba(&v2)), (cba(&k1), cba(&v1))];
assert_eq!(iterator1.collect::<Vec<_>>(), expected);
}
{
let iterator1 = db.iterator(IteratorMode::From(b"k0", Direction::Forward));
assert!(iterator1.valid());
let iterator2 = db.iterator(IteratorMode::From(b"k1", Direction::Forward));
assert!(iterator2.valid());
let iterator3 = db.iterator(IteratorMode::From(b"k11", Direction::Forward));
assert!(iterator3.valid());
let iterator4 = db.iterator(IteratorMode::From(b"k5", Direction::Forward));
assert!(!iterator4.valid());
let iterator5 = db.iterator(IteratorMode::From(b"k0", Direction::Reverse));
assert!(iterator5.valid());
let iterator6 = db.iterator(IteratorMode::From(b"k1", Direction::Reverse));
assert!(iterator6.valid());
let iterator7 = db.iterator(IteratorMode::From(b"k11", Direction::Reverse));
assert!(iterator7.valid());
let iterator8 = db.iterator(IteratorMode::From(b"k5", Direction::Reverse));
assert!(!iterator8.valid());
}
{
let mut iterator1 = db.iterator(IteratorMode::From(b"k4", Direction::Forward));
iterator1.next();
assert!(iterator1.valid());
iterator1.next();
assert!(!iterator1.valid());
}
}
let opts = Options::default();
assert!(DB::destroy(&opts, path).is_ok());
}