neoneo-go/pkg/core/mpt/trie_test.go

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package mpt
import (
"testing"
"github.com/nspcc-dev/neo-go/pkg/core/storage"
"github.com/nspcc-dev/neo-go/pkg/internal/random"
"github.com/stretchr/testify/require"
)
func newTestStore() *storage.MemCachedStore {
return storage.NewMemCachedStore(storage.NewMemoryStore())
}
func newTestTrie(t *testing.T) *Trie {
b := NewBranchNode()
l1 := NewLeafNode([]byte{0xAB, 0xCD})
b.Children[0] = NewExtensionNode([]byte{0x01}, l1)
l2 := NewLeafNode([]byte{0x22, 0x22})
b.Children[9] = NewExtensionNode([]byte{0x09}, l2)
v := NewLeafNode([]byte("hello"))
h := NewHashNode(v.Hash())
b.Children[10] = NewExtensionNode([]byte{0x0e}, h)
e := NewExtensionNode(toNibbles([]byte{0xAC}), b)
tr := NewTrie(e, newTestStore())
tr.putToStore(e)
tr.putToStore(b)
tr.putToStore(l1)
tr.putToStore(l2)
tr.putToStore(v)
tr.putToStore(b.Children[0])
tr.putToStore(b.Children[9])
tr.putToStore(b.Children[10])
return tr
}
func TestTrie_PutIntoBranchNode(t *testing.T) {
b := NewBranchNode()
l := NewLeafNode([]byte{0x8})
b.Children[0x7] = NewHashNode(l.Hash())
b.Children[0x8] = NewHashNode(random.Uint256())
tr := NewTrie(b, newTestStore())
// next
require.NoError(t, tr.Put([]byte{}, []byte{0x12, 0x34}))
tr.testHas(t, []byte{}, []byte{0x12, 0x34})
// empty hash node child
require.NoError(t, tr.Put([]byte{0x66}, []byte{0x56}))
tr.testHas(t, []byte{0x66}, []byte{0x56})
require.True(t, isValid(tr.root))
// missing hash
require.Error(t, tr.Put([]byte{0x70}, []byte{0x42}))
require.True(t, isValid(tr.root))
// hash is in store
tr.putToStore(l)
require.NoError(t, tr.Put([]byte{0x70}, []byte{0x42}))
require.True(t, isValid(tr.root))
}
func TestTrie_PutIntoExtensionNode(t *testing.T) {
l := NewLeafNode([]byte{0x11})
key := []byte{0x12}
e := NewExtensionNode(toNibbles(key), NewHashNode(l.Hash()))
tr := NewTrie(e, newTestStore())
// missing hash
require.Error(t, tr.Put(key, []byte{0x42}))
tr.putToStore(l)
require.NoError(t, tr.Put(key, []byte{0x42}))
tr.testHas(t, key, []byte{0x42})
require.True(t, isValid(tr.root))
}
func TestTrie_PutIntoHashNode(t *testing.T) {
b := NewBranchNode()
l := NewLeafNode(random.Bytes(5))
e := NewExtensionNode([]byte{0x02}, l)
b.Children[1] = NewHashNode(e.Hash())
b.Children[9] = NewHashNode(random.Uint256())
tr := NewTrie(b, newTestStore())
tr.putToStore(e)
t.Run("MissingLeafHash", func(t *testing.T) {
_, err := tr.Get([]byte{0x12})
require.Error(t, err)
})
tr.putToStore(l)
val := random.Bytes(3)
require.NoError(t, tr.Put([]byte{0x12, 0x34}, val))
tr.testHas(t, []byte{0x12, 0x34}, val)
tr.testHas(t, []byte{0x12}, l.value)
require.True(t, isValid(tr.root))
}
func TestTrie_Put(t *testing.T) {
trExp := newTestTrie(t)
trAct := NewTrie(nil, newTestStore())
require.NoError(t, trAct.Put([]byte{0xAC, 0x01}, []byte{0xAB, 0xCD}))
require.NoError(t, trAct.Put([]byte{0xAC, 0x99}, []byte{0x22, 0x22}))
require.NoError(t, trAct.Put([]byte{0xAC, 0xAE}, []byte("hello")))
// Note: the exact tries differ because of ("acae":"hello") node is stored as Hash node in test trie.
require.Equal(t, trExp.root.Hash(), trAct.root.Hash())
require.True(t, isValid(trAct.root))
}
func TestTrie_PutInvalid(t *testing.T) {
tr := NewTrie(nil, newTestStore())
key, value := []byte("key"), []byte("value")
// big key
require.Error(t, tr.Put(make([]byte, MaxKeyLength+1), value))
// big value
require.Error(t, tr.Put(key, make([]byte, MaxValueLength+1)))
// this is ok though
require.NoError(t, tr.Put(key, value))
tr.testHas(t, key, value)
}
func TestTrie_BigPut(t *testing.T) {
tr := NewTrie(nil, newTestStore())
items := []struct{ k, v string }{
{"item with long key", "value1"},
{"item with matching prefix", "value2"},
{"another prefix", "value3"},
{"another prefix 2", "value4"},
{"another ", "value5"},
}
for i := range items {
require.NoError(t, tr.Put([]byte(items[i].k), []byte(items[i].v)))
}
for i := range items {
tr.testHas(t, []byte(items[i].k), []byte(items[i].v))
}
t.Run("Rewrite", func(t *testing.T) {
k, v := []byte(items[0].k), []byte{0x01, 0x23}
require.NoError(t, tr.Put(k, v))
tr.testHas(t, k, v)
})
t.Run("Remove", func(t *testing.T) {
k := []byte(items[1].k)
require.NoError(t, tr.Put(k, []byte{}))
tr.testHas(t, k, nil)
})
}
func (tr *Trie) testHas(t *testing.T, key, value []byte) {
v, err := tr.Get(key)
if value == nil {
require.Error(t, err)
return
}
require.NoError(t, err)
require.Equal(t, value, v)
}
// isValid checks for 3 invariants:
// - BranchNode contains > 1 children
// - ExtensionNode do not contain another extension node
// - ExtensionNode do not have nil key
// It is used only during testing to catch possible bugs.
func isValid(curr Node) bool {
switch n := curr.(type) {
case *BranchNode:
var count int
for i := range n.Children {
if !isValid(n.Children[i]) {
return false
}
hn, ok := n.Children[i].(*HashNode)
if !ok || !hn.IsEmpty() {
count++
}
}
return count > 1
case *ExtensionNode:
_, ok := n.next.(*ExtensionNode)
return len(n.key) != 0 && !ok
default:
return true
}
}
func TestTrie_Get(t *testing.T) {
t.Run("HashNode", func(t *testing.T) {
tr := newTestTrie(t)
tr.testHas(t, []byte{0xAC, 0xAE}, []byte("hello"))
})
t.Run("UnfoldRoot", func(t *testing.T) {
tr := newTestTrie(t)
single := NewTrie(NewHashNode(tr.root.Hash()), tr.Store)
single.testHas(t, []byte{0xAC}, nil)
single.testHas(t, []byte{0xAC, 0x01}, []byte{0xAB, 0xCD})
single.testHas(t, []byte{0xAC, 0x99}, []byte{0x22, 0x22})
single.testHas(t, []byte{0xAC, 0xAE}, []byte("hello"))
})
}
func TestTrie_Flush(t *testing.T) {
pairs := map[string][]byte{
"": []byte("value0"),
"key1": []byte("value1"),
"key2": []byte("value2"),
}
tr := NewTrie(nil, newTestStore())
for k, v := range pairs {
require.NoError(t, tr.Put([]byte(k), v))
}
tr.Flush()
tr = NewTrie(NewHashNode(tr.StateRoot()), tr.Store)
for k, v := range pairs {
actual, err := tr.Get([]byte(k))
require.NoError(t, err)
require.Equal(t, v, actual)
}
}
func TestTrie_Delete(t *testing.T) {
t.Run("Hash", func(t *testing.T) {
t.Run("FromStore", func(t *testing.T) {
l := NewLeafNode([]byte{0x12})
tr := NewTrie(NewHashNode(l.Hash()), newTestStore())
t.Run("NotInStore", func(t *testing.T) {
require.Error(t, tr.Delete([]byte{}))
})
tr.putToStore(l)
tr.testHas(t, []byte{}, []byte{0x12})
require.NoError(t, tr.Delete([]byte{}))
tr.testHas(t, []byte{}, nil)
})
t.Run("Empty", func(t *testing.T) {
tr := NewTrie(nil, newTestStore())
require.Error(t, tr.Delete([]byte{}))
})
})
t.Run("Leaf", func(t *testing.T) {
l := NewLeafNode([]byte{0x12, 0x34})
tr := NewTrie(l, newTestStore())
t.Run("NonExistentKey", func(t *testing.T) {
require.Error(t, tr.Delete([]byte{0x12}))
tr.testHas(t, []byte{}, []byte{0x12, 0x34})
})
require.NoError(t, tr.Delete([]byte{}))
tr.testHas(t, []byte{}, nil)
})
t.Run("Extension", func(t *testing.T) {
t.Run("SingleKey", func(t *testing.T) {
l := NewLeafNode([]byte{0x12, 0x34})
e := NewExtensionNode([]byte{0x0A, 0x0B}, l)
tr := NewTrie(e, newTestStore())
t.Run("NonExistentKey", func(t *testing.T) {
require.Error(t, tr.Delete([]byte{}))
tr.testHas(t, []byte{0xAB}, []byte{0x12, 0x34})
})
require.NoError(t, tr.Delete([]byte{0xAB}))
require.True(t, tr.root.(*HashNode).IsEmpty())
})
t.Run("MultipleKeys", func(t *testing.T) {
b := NewBranchNode()
b.Children[0] = NewExtensionNode([]byte{0x01}, NewLeafNode([]byte{0x12, 0x34}))
b.Children[6] = NewExtensionNode([]byte{0x07}, NewLeafNode([]byte{0x56, 0x78}))
e := NewExtensionNode([]byte{0x01, 0x02}, b)
tr := NewTrie(e, newTestStore())
h := e.Hash()
require.NoError(t, tr.Delete([]byte{0x12, 0x01}))
tr.testHas(t, []byte{0x12, 0x01}, nil)
tr.testHas(t, []byte{0x12, 0x67}, []byte{0x56, 0x78})
require.NotEqual(t, h, tr.root.Hash())
require.Equal(t, toNibbles([]byte{0x12, 0x67}), e.key)
require.IsType(t, (*LeafNode)(nil), e.next)
})
})
t.Run("Branch", func(t *testing.T) {
t.Run("3 Children", func(t *testing.T) {
b := NewBranchNode()
b.Children[lastChild] = NewLeafNode([]byte{0x12})
b.Children[0] = NewExtensionNode([]byte{0x01}, NewLeafNode([]byte{0x34}))
b.Children[1] = NewExtensionNode([]byte{0x06}, NewLeafNode([]byte{0x56}))
tr := NewTrie(b, newTestStore())
require.NoError(t, tr.Delete([]byte{0x16}))
tr.testHas(t, []byte{}, []byte{0x12})
tr.testHas(t, []byte{0x01}, []byte{0x34})
tr.testHas(t, []byte{0x16}, nil)
})
t.Run("2 Children", func(t *testing.T) {
newt := func(t *testing.T) *Trie {
b := NewBranchNode()
b.Children[lastChild] = NewLeafNode([]byte{0x12})
l := NewLeafNode([]byte{0x34})
e := NewExtensionNode([]byte{0x06}, l)
b.Children[5] = NewHashNode(e.Hash())
tr := NewTrie(b, newTestStore())
tr.putToStore(l)
tr.putToStore(e)
return tr
}
t.Run("DeleteLast", func(t *testing.T) {
t.Run("MergeExtension", func(t *testing.T) {
tr := newt(t)
require.NoError(t, tr.Delete([]byte{}))
tr.testHas(t, []byte{}, nil)
tr.testHas(t, []byte{0x56}, []byte{0x34})
require.IsType(t, (*ExtensionNode)(nil), tr.root)
})
t.Run("LeaveLeaf", func(t *testing.T) {
c := NewBranchNode()
c.Children[5] = NewLeafNode([]byte{0x05})
c.Children[6] = NewLeafNode([]byte{0x06})
b := NewBranchNode()
b.Children[lastChild] = NewLeafNode([]byte{0x12})
b.Children[5] = c
tr := NewTrie(b, newTestStore())
require.NoError(t, tr.Delete([]byte{}))
tr.testHas(t, []byte{}, nil)
tr.testHas(t, []byte{0x55}, []byte{0x05})
tr.testHas(t, []byte{0x56}, []byte{0x06})
require.IsType(t, (*ExtensionNode)(nil), tr.root)
})
})
t.Run("DeleteMiddle", func(t *testing.T) {
tr := newt(t)
require.NoError(t, tr.Delete([]byte{0x56}))
tr.testHas(t, []byte{}, []byte{0x12})
tr.testHas(t, []byte{0x56}, nil)
require.IsType(t, (*LeafNode)(nil), tr.root)
})
})
})
}
func TestTrie_PanicInvalidRoot(t *testing.T) {
tr := &Trie{Store: newTestStore()}
require.Panics(t, func() { _ = tr.Put([]byte{1}, []byte{2}) })
require.Panics(t, func() { _, _ = tr.Get([]byte{1}) })
require.Panics(t, func() { _ = tr.Delete([]byte{1}) })
}