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mpt: modify refcounted storage scheme to make GC possible

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Add "active" flag into the node data and make the remainder modal, for active
nodes it's a reference counter, for inactive ones the deactivation height is
stored.

Technically, refcounted chains storing just one trie don't need a flag, but
it's a bit simpler this way.
This commit is contained in:
Roman Khimov 2022-01-28 15:05:13 +03:00
parent 86cb4ed80f
commit c4ee310e85
9 changed files with 84 additions and 62 deletions
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14
pkg/core/mpt/batch_test.go
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@ -56,7 +56,7 @@ func testIncompletePut(t *testing.T, ps pairs, n int, tr1, tr2 *Trie) {
require.Equal(t, tr1.StateRoot(), tr2.StateRoot())
t.Run("test restore", func(t *testing.T) {
tr2.Flush()
tr2.Flush(0)
tr3 := NewTrie(NewHashNode(tr2.StateRoot()), ModeAll, storage.NewMemCachedStore(tr2.Store))
for _, p := range ps[:n] {
val, err := tr3.Get(p[0])
@ -191,9 +191,9 @@ func TestTrie_PutBatchBranch(t *testing.T) {
t.Run("non-empty child is hash node", func(t *testing.T) {
tr1, tr2 := prepareBranch(t)
tr1.Flush()
tr1.Flush(0)
tr1.Collapse(1)
tr2.Flush()
tr2.Flush(0)
tr2.Collapse(1)
var ps = pairs{{[]byte{0x00, 2}, nil}}
@ -208,9 +208,9 @@ func TestTrie_PutBatchBranch(t *testing.T) {
require.NoError(t, tr1.Put([]byte{0x00}, []byte("value2")))
require.NoError(t, tr2.Put([]byte{0x00}, []byte("value2")))
tr1.Flush()
tr1.Flush(0)
tr1.Collapse(1)
tr2.Flush()
tr2.Flush(0)
tr2.Collapse(1)
var ps = pairs{{[]byte{0x00, 2}, nil}}
@ -254,8 +254,8 @@ func TestTrie_PutBatchHash(t *testing.T) {
require.NoError(t, tr2.Put([]byte{0x10}, []byte("value1")))
require.NoError(t, tr1.Put([]byte{0x20}, []byte("value2")))
require.NoError(t, tr2.Put([]byte{0x20}, []byte("value2")))
tr1.Flush()
tr2.Flush()
tr1.Flush(0)
tr2.Flush(0)
return tr1, tr2
}