5fded04037
This PR replaces fastcache with a pretty simple LRU which does not require explicit closing.
123 lines
3.3 KiB
Go
123 lines
3.3 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package lru
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import (
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"encoding/binary"
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"fmt"
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"testing"
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"github.com/ethereum/go-ethereum/common"
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)
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func mkHash(i int) common.Hash {
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h := make([]byte, 32)
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binary.LittleEndian.PutUint64(h, uint64(i))
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return common.BytesToHash(h)
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}
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func TestBlobLru(t *testing.T) {
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lru := NewSizeConstrainedLRU(100)
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var want uint64
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// Add 11 items of 10 byte each. First item should be swapped out
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for i := 0; i < 11; i++ {
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k := mkHash(i)
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v := fmt.Sprintf("value-%04d", i)
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lru.Add(k, []byte(v))
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want += uint64(len(v))
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if want > 100 {
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want = 100
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}
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if have := lru.size; have != want {
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t.Fatalf("size wrong, have %d want %d", have, want)
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}
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}
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// Zero:th should be evicted
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{
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k := mkHash(0)
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if val := lru.Get(k); val != nil {
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t.Fatalf("should be evicted: %v", k)
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}
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}
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// Elems 1-11 should be present
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for i := 1; i < 11; i++ {
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k := mkHash(i)
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want := fmt.Sprintf("value-%04d", i)
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have := lru.Get(k)
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if have == nil {
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t.Fatalf("missing key %v", k)
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}
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if string(have) != want {
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t.Fatalf("wrong value, have %v want %v", have, want)
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}
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}
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}
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// TestBlobLruOverflow tests what happens when inserting an element exceeding
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// the max size
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func TestBlobLruOverflow(t *testing.T) {
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lru := NewSizeConstrainedLRU(100)
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// Add 10 items of 10 byte each, filling the cache
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for i := 0; i < 10; i++ {
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k := mkHash(i)
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v := fmt.Sprintf("value-%04d", i)
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lru.Add(k, []byte(v))
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}
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// Add one single large elem. We expect it to swap out all entries.
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{
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k := mkHash(1337)
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v := make([]byte, 200)
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lru.Add(k, v)
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}
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// Elems 0-9 should be missing
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for i := 1; i < 10; i++ {
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k := mkHash(i)
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if val := lru.Get(k); val != nil {
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t.Fatalf("should be evicted: %v", k)
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}
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}
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// The size should be accurate
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if have, want := lru.size, uint64(200); have != want {
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t.Fatalf("size wrong, have %d want %d", have, want)
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}
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// Adding one small item should swap out the large one
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{
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i := 0
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k := mkHash(i)
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v := fmt.Sprintf("value-%04d", i)
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lru.Add(k, []byte(v))
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if have, want := lru.size, uint64(10); have != want {
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t.Fatalf("size wrong, have %d want %d", have, want)
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}
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}
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}
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// TestBlobLruSameItem tests what happens when inserting the same k/v multiple times.
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func TestBlobLruSameItem(t *testing.T) {
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lru := NewSizeConstrainedLRU(100)
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// Add one 10 byte-item 10 times
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k := mkHash(0)
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v := fmt.Sprintf("value-%04d", 0)
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for i := 0; i < 10; i++ {
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lru.Add(k, []byte(v))
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}
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// The size should be accurate
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if have, want := lru.size, uint64(10); have != want {
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t.Fatalf("size wrong, have %d want %d", have, want)
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}
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}
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