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334 lines
8.1 KiB
334 lines
8.1 KiB
package merkle
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import (
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"bytes"
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"fmt"
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"github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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. "github.com/tendermint/tendermint/common/test"
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"github.com/tendermint/tendermint/db"
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"runtime"
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"testing"
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)
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func randstr(length int) string {
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return RandStr(length)
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}
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// Convenience for a new node
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func N(l, r interface{}) *IAVLNode {
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var left, right *IAVLNode
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if _, ok := l.(*IAVLNode); ok {
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left = l.(*IAVLNode)
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} else {
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left = NewIAVLNode(l, "")
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}
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if _, ok := r.(*IAVLNode); ok {
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right = r.(*IAVLNode)
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} else {
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right = NewIAVLNode(r, "")
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}
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n := &IAVLNode{
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key: right.lmd(nil).key,
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value: "",
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leftNode: left,
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rightNode: right,
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}
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n.calcHeightAndSize(nil)
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return n
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}
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// Setup a deep node
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func T(n *IAVLNode) *IAVLTree {
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t := NewIAVLTree(binary.BasicCodec, binary.BasicCodec, 0, nil)
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n.hashWithCount(t)
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t.root = n
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return t
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}
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// Convenience for simple printing of keys & tree structure
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func P(n *IAVLNode) string {
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if n.height == 0 {
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return fmt.Sprintf("%v", n.key)
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} else {
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return fmt.Sprintf("(%v %v)", P(n.leftNode), P(n.rightNode))
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}
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}
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func TestUnit(t *testing.T) {
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expectHash := func(tree *IAVLTree, hashCount uint) {
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// ensure number of new hash calculations is as expected.
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hash, count := tree.HashWithCount()
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if count != hashCount {
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t.Fatalf("Expected %v new hashes, got %v", hashCount, count)
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}
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// nuke hashes and reconstruct hash, ensure it's the same.
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tree.root.traverse(tree, func(node *IAVLNode) bool {
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node.hash = nil
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return false
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})
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// ensure that the new hash after nuking is the same as the old.
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newHash, _ := tree.HashWithCount()
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if bytes.Compare(hash, newHash) != 0 {
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t.Fatalf("Expected hash %v but got %v after nuking", hash, newHash)
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}
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}
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expectSet := func(tree *IAVLTree, i int, repr string, hashCount uint) {
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origNode := tree.root
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updated := tree.Set(i, "")
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// ensure node was added & structure is as expected.
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if updated == true || P(tree.root) != repr {
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t.Fatalf("Adding %v to %v:\nExpected %v\nUnexpectedly got %v updated:%v",
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i, P(origNode), repr, P(tree.root), updated)
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}
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// ensure hash calculation requirements
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expectHash(tree, hashCount)
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tree.root = origNode
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}
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expectRemove := func(tree *IAVLTree, i int, repr string, hashCount uint) {
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origNode := tree.root
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value, removed := tree.Remove(i)
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// ensure node was added & structure is as expected.
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if value != "" || !removed || P(tree.root) != repr {
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t.Fatalf("Removing %v from %v:\nExpected %v\nUnexpectedly got %v value:%v removed:%v",
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i, P(origNode), repr, P(tree.root), value, removed)
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}
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// ensure hash calculation requirements
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expectHash(tree, hashCount)
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tree.root = origNode
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}
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//////// Test Set cases:
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// Case 1:
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t1 := T(N(4, 20))
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expectSet(t1, 8, "((4 8) 20)", 3)
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expectSet(t1, 25, "(4 (20 25))", 3)
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t2 := T(N(4, N(20, 25)))
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expectSet(t2, 8, "((4 8) (20 25))", 3)
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expectSet(t2, 30, "((4 20) (25 30))", 4)
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t3 := T(N(N(1, 2), 6))
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expectSet(t3, 4, "((1 2) (4 6))", 4)
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expectSet(t3, 8, "((1 2) (6 8))", 3)
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t4 := T(N(N(1, 2), N(N(5, 6), N(7, 9))))
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expectSet(t4, 8, "(((1 2) (5 6)) ((7 8) 9))", 5)
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expectSet(t4, 10, "(((1 2) (5 6)) (7 (9 10)))", 5)
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//////// Test Remove cases:
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t10 := T(N(N(1, 2), 3))
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expectRemove(t10, 2, "(1 3)", 1)
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expectRemove(t10, 3, "(1 2)", 0)
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t11 := T(N(N(N(1, 2), 3), N(4, 5)))
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expectRemove(t11, 4, "((1 2) (3 5))", 2)
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expectRemove(t11, 3, "((1 2) (4 5))", 1)
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}
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func TestIntegration(t *testing.T) {
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type record struct {
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key string
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value string
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}
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records := make([]*record, 400)
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var tree *IAVLTree = NewIAVLTree(binary.BasicCodec, binary.BasicCodec, 0, nil)
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randomRecord := func() *record {
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return &record{randstr(20), randstr(20)}
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}
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for i := range records {
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r := randomRecord()
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records[i] = r
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//t.Log("New record", r)
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//PrintIAVLNode(tree.root)
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updated := tree.Set(r.key, "")
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if updated {
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t.Error("should have not been updated")
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}
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updated = tree.Set(r.key, r.value)
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if !updated {
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t.Error("should have been updated")
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}
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if tree.Size() != uint(i+1) {
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t.Error("size was wrong", tree.Size(), i+1)
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}
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}
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for _, r := range records {
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if has := tree.Has(r.key); !has {
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t.Error("Missing key", r.key)
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}
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if has := tree.Has(randstr(12)); has {
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t.Error("Table has extra key")
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}
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if _, val := tree.Get(r.key); val.(string) != r.value {
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t.Error("wrong value")
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}
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}
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for i, x := range records {
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if val, removed := tree.Remove(x.key); !removed {
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t.Error("Wasn't removed")
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} else if val != x.value {
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t.Error("Wrong value")
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}
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for _, r := range records[i+1:] {
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if has := tree.Has(r.key); !has {
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t.Error("Missing key", r.key)
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}
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if has := tree.Has(randstr(12)); has {
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t.Error("Table has extra key")
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}
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_, val := tree.Get(r.key)
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if val != r.value {
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t.Error("wrong value")
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}
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}
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if tree.Size() != uint(len(records)-(i+1)) {
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t.Error("size was wrong", tree.Size(), (len(records) - (i + 1)))
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}
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}
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}
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func TestPersistence(t *testing.T) {
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db := db.NewMemDB()
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// Create some random key value pairs
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records := make(map[string]string)
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for i := 0; i < 10000; i++ {
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records[randstr(20)] = randstr(20)
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}
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// Construct some tree and save it
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t1 := NewIAVLTree(binary.BasicCodec, binary.BasicCodec, 0, db)
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for key, value := range records {
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t1.Set(key, value)
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}
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t1.Save()
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hash, _ := t1.HashWithCount()
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// Load a tree
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t2 := NewIAVLTree(binary.BasicCodec, binary.BasicCodec, 0, db)
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t2.Load(hash)
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for key, value := range records {
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_, t2value := t2.Get(key)
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if t2value != value {
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t.Fatalf("Invalid value. Expected %v, got %v", value, t2value)
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}
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}
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}
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func testProof(t *testing.T, proof *IAVLProof, keyBytes, valueBytes, rootHash []byte) {
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// Proof must verify.
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if !proof.Verify(keyBytes, valueBytes, rootHash) {
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t.Errorf("Invalid proof. Verification failed.")
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return
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}
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// Write/Read then verify.
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proofBytes := binary.BinaryBytes(proof)
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n, err := int64(0), error(nil)
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proof2 := binary.ReadBinary(&IAVLProof{}, bytes.NewBuffer(proofBytes), &n, &err).(*IAVLProof)
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if err != nil {
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t.Errorf("Failed to read IAVLProof from bytes: %v", err)
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return
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}
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if !proof2.Verify(keyBytes, valueBytes, rootHash) {
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t.Errorf("Invalid proof after write/read. Verification failed.")
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return
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}
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// Random mutations must not verify
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for i := 0; i < 5; i++ {
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badProofBytes := MutateByteSlice(proofBytes)
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n, err := int64(0), error(nil)
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badProof := binary.ReadBinary(&IAVLProof{}, bytes.NewBuffer(badProofBytes), &n, &err).(*IAVLProof)
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if err != nil {
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continue // This is fine.
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}
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if badProof.Verify(keyBytes, valueBytes, rootHash) {
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t.Errorf("Proof was still valid after a random mutation:\n%X\n%X", proofBytes, badProofBytes)
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}
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}
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}
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func TestIAVLProof(t *testing.T) {
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// Convenient wrapper around binary.BasicCodec.
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toBytes := func(o interface{}) []byte {
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buf, n, err := new(bytes.Buffer), int64(0), error(nil)
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binary.BasicCodec.Encode(o, buf, &n, &err)
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if err != nil {
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panic(Fmt("Failed to encode thing: %v", err))
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}
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return buf.Bytes()
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}
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// Construct some random tree
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db := db.NewMemDB()
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var tree *IAVLTree = NewIAVLTree(binary.BasicCodec, binary.BasicCodec, 100, db)
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for i := 0; i < 1000; i++ {
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key, value := randstr(20), randstr(20)
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tree.Set(key, value)
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}
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// Persist the items so far
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tree.Save()
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// Add more items so it's not all persisted
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for i := 0; i < 100; i++ {
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key, value := randstr(20), randstr(20)
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tree.Set(key, value)
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}
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// Now for each item, construct a proof and verify
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tree.Iterate(func(key interface{}, value interface{}) bool {
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proof := tree.ConstructProof(key)
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if !bytes.Equal(proof.RootHash, tree.Hash()) {
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t.Errorf("Invalid proof. Expected root %X, got %X", tree.Hash(), proof.RootHash)
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}
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testProof(t, proof, toBytes(key), toBytes(value), tree.Hash())
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return false
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})
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}
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func BenchmarkImmutableAvlTree(b *testing.B) {
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b.StopTimer()
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t := NewIAVLTree(binary.BasicCodec, binary.BasicCodec, 0, nil)
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// 23000ns/op, 43000ops/s
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// for i := 0; i < 10000000; i++ {
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for i := 0; i < 1000000; i++ {
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t.Set(RandUint64(), "")
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}
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fmt.Println("ok, starting")
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runtime.GC()
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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ri := RandUint64()
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t.Set(ri, "")
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t.Remove(ri)
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}
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}
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