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// Copyright 2020 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.
mod util;
use pretty_assertions::assert_eq;
use rocksdb::{DBAccess, DBRawIteratorWithThreadMode, DB};
use util::DBPath;
fn assert_item<D: DBAccess>(iter: &DBRawIteratorWithThreadMode<'_, D>, key: &[u8], value: &[u8]) {
assert!(iter.valid());
assert_eq!(iter.key(), Some(key));
assert_eq!(iter.value(), Some(value));
assert_eq!(iter.item(), Some((key, value)));
}
fn assert_no_item<D: DBAccess>(iter: &DBRawIteratorWithThreadMode<'_, D>) {
assert!(!iter.valid());
assert_eq!(iter.key(), None);
assert_eq!(iter.value(), None);
assert_eq!(iter.item(), None);
}
#[test]
pub fn test_forwards_iteration() {
let n = DBPath::new("forwards_iteration");
{
let db = DB::open_default(&n).unwrap();
db.put(b"k1", b"v1").unwrap();
db.put(b"k2", b"v2").unwrap();
db.put(b"k3", b"v3").unwrap();
db.put(b"k4", b"v4").unwrap();
let mut iter = db.raw_iterator();
iter.seek_to_first();
assert_item(&iter, b"k1", b"v1");
iter.next();
assert_item(&iter, b"k2", b"v2");
iter.next(); // k3
iter.next(); // k4
iter.next(); // invalid!
assert_no_item(&iter);
}
}
#[test]
pub fn test_seek_last() {
let n = DBPath::new("backwards_iteration");
{
let db = DB::open_default(&n).unwrap();
db.put(b"k1", b"v1").unwrap();
db.put(b"k2", b"v2").unwrap();
db.put(b"k3", b"v3").unwrap();
db.put(b"k4", b"v4").unwrap();
let mut iter = db.raw_iterator();
iter.seek_to_last();
assert_item(&iter, b"k4", b"v4");
iter.prev();
assert_item(&iter, b"k3", b"v3");
iter.prev(); // k2
iter.prev(); // k1
iter.prev(); // invalid!
assert_no_item(&iter);
}
}
#[test]
pub fn test_seek() {
let n = DBPath::new("seek");
{
let db = DB::open_default(&n).unwrap();
db.put(b"k1", b"v1").unwrap();
db.put(b"k2", b"v2").unwrap();
db.put(b"k4", b"v4").unwrap();
let mut iter = db.raw_iterator();
iter.seek(b"k2");
assert_item(&iter, b"k2", b"v2");
// Check it gets the next key when the key doesn't exist
iter.seek(b"k3");
assert_item(&iter, b"k4", b"v4");
}
}
#[test]
pub fn test_seek_to_nonexistant() {
let n = DBPath::new("seek_to_nonexistant");
{
let db = DB::open_default(&n).unwrap();
db.put(b"k1", b"v1").unwrap();
db.put(b"k3", b"v3").unwrap();
db.put(b"k4", b"v4").unwrap();
let mut iter = db.raw_iterator();
iter.seek(b"k2");
assert_item(&iter, b"k3", b"v3");
}
}
#[test]
pub fn test_seek_for_prev() {
let n = DBPath::new("seek_for_prev");
{
let db = DB::open_default(&n).unwrap();
db.put(b"k1", b"v1").unwrap();
db.put(b"k2", b"v2").unwrap();
db.put(b"k4", b"v4").unwrap();
let mut iter = db.raw_iterator();
iter.seek(b"k2");
assert_item(&iter, b"k2", b"v2");
// Check it gets the previous key when the key doesn't exist
iter.seek_for_prev(b"k3");
assert_item(&iter, b"k2", b"v2");
}
}
#[test]
pub fn test_next_without_seek() {
let n = DBPath::new("test_forgot_seek");
{
let db = DB::open_default(&n).unwrap();
db.put(b"k1", b"v1").unwrap();
db.put(b"k2", b"v2").unwrap();
db.put(b"k4", b"v4").unwrap();
let mut iter = db.raw_iterator();
iter.next();
}
}
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