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package merkle
import (
"bytes"
"fmt"
. "github.com/tendermint/tendermint/binary"
. "github.com/tendermint/tendermint/common"
"github.com/tendermint/tendermint/db"
"runtime"
"testing"
)
func init() {
// TODO: seed rand?
}
func randstr(length int) string {
return RandStr(length)
}
// Convenience for a new node
func N(l, r interface{}) *IAVLNode {
var left, right *IAVLNode
if _, ok := l.(*IAVLNode); ok {
left = l.(*IAVLNode)
} else {
left = NewIAVLNode(l, "")
}
if _, ok := r.(*IAVLNode); ok {
right = r.(*IAVLNode)
} else {
right = NewIAVLNode(r, "")
}
n := &IAVLNode{
key: right.lmd(nil).key,
value: "",
leftNode: left,
rightNode: right,
}
n.calcHeightAndSize(nil)
return n
}
// Setup a deep node
func T(n *IAVLNode) *IAVLTree {
t := NewIAVLTree(BasicCodec, BasicCodec, 0, nil)
n.hashWithCount(t)
t.root = n
return t
}
// Convenience for simple printing of keys & tree structure
func P(n *IAVLNode) string {
if n.height == 0 {
return fmt.Sprintf("%v", n.key)
} else {
return fmt.Sprintf("(%v %v)", P(n.leftNode), P(n.rightNode))
}
}
func TestUnit(t *testing.T) {
expectHash := func(tree *IAVLTree, hashCount uint64) {
// ensure number of new hash calculations is as expected.
hash, count := tree.HashWithCount()
if count != hashCount {
t.Fatalf("Expected %v new hashes, got %v", hashCount, count)
}
// nuke hashes and reconstruct hash, ensure it's the same.
tree.root.traverse(tree, func(node *IAVLNode) bool {
node.hash = nil
return false
})
// ensure that the new hash after nuking is the same as the old.
newHash, _ := tree.HashWithCount()
if bytes.Compare(hash, newHash) != 0 {
t.Fatalf("Expected hash %v but got %v after nuking", hash, newHash)
}
}
expectSet := func(tree *IAVLTree, i int, repr string, hashCount uint64) {
origNode := tree.root
updated := tree.Set(i, "")
// ensure node was added & structure is as expected.
if updated == true || P(tree.root) != repr {
t.Fatalf("Adding %v to %v:\nExpected %v\nUnexpectedly got %v updated:%v",
i, P(origNode), repr, P(tree.root), updated)
}
// ensure hash calculation requirements
expectHash(tree, hashCount)
tree.root = origNode
}
expectRemove := func(tree *IAVLTree, i int, repr string, hashCount uint64) {
origNode := tree.root
value, removed := tree.Remove(i)
// ensure node was added & structure is as expected.
if value != "" || !removed || P(tree.root) != repr {
t.Fatalf("Removing %v from %v:\nExpected %v\nUnexpectedly got %v value:%v removed:%v",
i, P(origNode), repr, P(tree.root), value, removed)
}
// ensure hash calculation requirements
expectHash(tree, hashCount)
tree.root = origNode
}
//////// Test Set cases:
// Case 1:
t1 := T(N(4, 20))
expectSet(t1, 8, "((4 8) 20)", 3)
expectSet(t1, 25, "(4 (20 25))", 3)
t2 := T(N(4, N(20, 25)))
expectSet(t2, 8, "((4 8) (20 25))", 3)
expectSet(t2, 30, "((4 20) (25 30))", 4)
t3 := T(N(N(1, 2), 6))
expectSet(t3, 4, "((1 2) (4 6))", 4)
expectSet(t3, 8, "((1 2) (6 8))", 3)
t4 := T(N(N(1, 2), N(N(5, 6), N(7, 9))))
expectSet(t4, 8, "(((1 2) (5 6)) ((7 8) 9))", 5)
expectSet(t4, 10, "(((1 2) (5 6)) (7 (9 10)))", 5)
//////// Test Remove cases:
t10 := T(N(N(1, 2), 3))
expectRemove(t10, 2, "(1 3)", 1)
expectRemove(t10, 3, "(1 2)", 0)
t11 := T(N(N(N(1, 2), 3), N(4, 5)))
expectRemove(t11, 4, "((1 2) (3 5))", 2)
expectRemove(t11, 3, "((1 2) (4 5))", 1)
}
func TestIntegration(t *testing.T) {
type record struct {
key string
value string
}
records := make([]*record, 400)
var tree *IAVLTree = NewIAVLTree(BasicCodec, BasicCodec, 0, nil)
randomRecord := func() *record {
return &record{randstr(20), randstr(20)}
}
for i := range records {
r := randomRecord()
records[i] = r
//t.Log("New record", r)
//PrintIAVLNode(tree.root)
updated := tree.Set(r.key, "")
if updated {
t.Error("should have not been updated")
}
updated = tree.Set(r.key, r.value)
if !updated {
t.Error("should have been updated")
}
if tree.Size() != uint64(i+1) {
t.Error("size was wrong", tree.Size(), i+1)
}
}
for _, r := range records {
if has := tree.Has(r.key); !has {
t.Error("Missing key", r.key)
}
if has := tree.Has(randstr(12)); has {
t.Error("Table has extra key")
}
if _, val := tree.Get(r.key); val.(string) != r.value {
t.Error("wrong value")
}
}
for i, x := range records {
if val, removed := tree.Remove(x.key); !removed {
t.Error("Wasn't removed")
} else if val != x.value {
t.Error("Wrong value")
}
for _, r := range records[i+1:] {
if has := tree.Has(r.key); !has {
t.Error("Missing key", r.key)
}
if has := tree.Has(randstr(12)); has {
t.Error("Table has extra key")
}
_, val := tree.Get(r.key)
if val != r.value {
t.Error("wrong value")
}
}
if tree.Size() != uint64(len(records)-(i+1)) {
t.Error("size was wrong", tree.Size(), (len(records) - (i + 1)))
}
}
}
func TestPersistence(t *testing.T) {
db := db.NewMemDB()
// Create some random key value pairs
records := make(map[string]string)
for i := 0; i < 10000; i++ {
records[randstr(20)] = randstr(20)
}
// Construct some tree and save it
t1 := NewIAVLTree(BasicCodec, BasicCodec, 0, db)
for key, value := range records {
t1.Set(key, value)
}
t1.Save()
hash, _ := t1.HashWithCount()
// Load a tree
t2 := NewIAVLTree(BasicCodec, BasicCodec, 0, db)
t2.Load(hash)
for key, value := range records {
_, t2value := t2.Get(key)
if t2value != value {
t.Fatalf("Invalid value. Expected %v, got %v", value, t2value)
}
}
}
func BenchmarkImmutableAvlTree(b *testing.B) {
b.StopTimer()
t := NewIAVLTree(BasicCodec, BasicCodec, 0, nil)
for i := 0; i < 1000000; i++ {
t.Set(RandUint64(), "")
}
fmt.Println("ok, starting")
runtime.GC()
b.StartTimer()
for i := 0; i < b.N; i++ {
ri := RandUint64()
t.Set(ri, "")
t.Remove(ri)
}
}