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package trie
import (
"bytes"
crand "crypto/rand"
mrand "math/rand"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/rlp"
)
func init() {
mrand.Seed(time.Now().Unix())
}
func TestProof(t *testing.T) {
trie, vals := randomTrie(500)
root := trie.Hash()
for _, kv := range vals {
proof := trie.Prove(kv.k)
if proof == nil {
t.Fatalf("missing key %x while constructing proof", kv.k)
}
val, err := VerifyProof(root, kv.k, proof)
if err != nil {
t.Fatalf("VerifyProof error for key %x: %v\nraw proof: %x", kv.k, err, proof)
}
if !bytes.Equal(val, kv.v) {
t.Fatalf("VerifyProof returned wrong value for key %x: got %x, want %x", kv.k, val, kv.v)
}
}
}
func TestOneElementProof(t *testing.T) {
trie := new(Trie)
updateString(trie, "k", "v")
proof := trie.Prove([]byte("k"))
if proof == nil {
t.Fatal("nil proof")
}
if len(proof) != 1 {
t.Error("proof should have one element")
}
val, err := VerifyProof(trie.Hash(), []byte("k"), proof)
if err != nil {
t.Fatalf("VerifyProof error: %v\nraw proof: %x", err, proof)
}
if !bytes.Equal(val, []byte("v")) {
t.Fatalf("VerifyProof returned wrong value: got %x, want 'k'", val)
}
}
func TestVerifyBadProof(t *testing.T) {
trie, vals := randomTrie(800)
root := trie.Hash()
for _, kv := range vals {
proof := trie.Prove(kv.k)
if proof == nil {
t.Fatal("nil proof")
}
mutateByte(proof[mrand.Intn(len(proof))])
if _, err := VerifyProof(root, kv.k, proof); err == nil {
t.Fatalf("expected proof to fail for key %x", kv.k)
}
}
}
// mutateByte changes one byte in b.
func mutateByte(b []byte) {
for r := mrand.Intn(len(b)); ; {
new := byte(mrand.Intn(255))
if new != b[r] {
b[r] = new
break
}
}
}
func BenchmarkProve(b *testing.B) {
trie, vals := randomTrie(100)
var keys []string
for k := range vals {
keys = append(keys, k)
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
kv := vals[keys[i%len(keys)]]
if trie.Prove(kv.k) == nil {
b.Fatalf("nil proof for %x", kv.k)
}
}
}
func BenchmarkVerifyProof(b *testing.B) {
trie, vals := randomTrie(100)
root := trie.Hash()
var keys []string
var proofs [][]rlp.RawValue
for k := range vals {
keys = append(keys, k)
proofs = append(proofs, trie.Prove([]byte(k)))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
im := i % len(keys)
if _, err := VerifyProof(root, []byte(keys[im]), proofs[im]); err != nil {
b.Fatalf("key %x: error", keys[im], err)
}
}
}
func randomTrie(n int) (*Trie, map[string]*kv) {
trie := new(Trie)
vals := make(map[string]*kv)
for i := byte(0); i < 100; i++ {
value := &kv{common.LeftPadBytes([]byte{i}, 32), []byte{i}, false}
value2 := &kv{common.LeftPadBytes([]byte{i + 10}, 32), []byte{i}, false}
trie.Update(value.k, value.v)
trie.Update(value2.k, value2.v)
vals[string(value.k)] = value
vals[string(value2.k)] = value2
}
for i := 0; i < n; i++ {
value := &kv{randBytes(32), randBytes(20), false}
trie.Update(value.k, value.v)
vals[string(value.k)] = value
}
return trie, vals
}
func randBytes(n int) []byte {
r := make([]byte, n)
crand.Read(r)
return r
}
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