trie: use keyvalue reader for non-mutating methods (ethereum#24221)

Author: Darioush Jalali

trie/iterator.go

@@ -115,7 +115,7 @@ type NodeIterator interface {
 	// Before adding a similar mechanism to any other place in Geth, consider
 	// making trie.Database an interface and wrapping at that level. It's a huge
 	// refactor, but it could be worth it if another occurrence arises.
-	AddResolver(ethdb.KeyValueStore)
+	AddResolver(ethdb.KeyValueReader)
 }
 
 // nodeIteratorState represents the iteration state at one particular node of the
@@ -134,7 +134,7 @@ type nodeIterator struct {
 	path  []byte               // Path to the current node
 	err   error                // Failure set in case of an internal error in the iterator
 
-	resolver ethdb.KeyValueStore // Optional intermediate resolver above the disk layer
+	resolver ethdb.KeyValueReader // Optional intermediate resolver above the disk layer
 }
 
 // errIteratorEnd is stored in nodeIterator.err when iteration is done.
@@ -159,7 +159,7 @@ func newNodeIterator(trie *Trie, start []byte) NodeIterator {
 	return it
 }
 
-func (it *nodeIterator) AddResolver(resolver ethdb.KeyValueStore) {
+func (it *nodeIterator) AddResolver(resolver ethdb.KeyValueReader) {
 	it.resolver = resolver
 }
 
@@ -549,7 +549,7 @@ func (it *differenceIterator) Path() []byte {
 	return it.b.Path()
 }
 
-func (it *differenceIterator) AddResolver(resolver ethdb.KeyValueStore) {
+func (it *differenceIterator) AddResolver(resolver ethdb.KeyValueReader) {
 	panic("not implemented")
 }
 
@@ -660,7 +660,7 @@ func (it *unionIterator) Path() []byte {
 	return (*it.items)[0].Path()
 }
 
-func (it *unionIterator) AddResolver(resolver ethdb.KeyValueStore) {
+func (it *unionIterator) AddResolver(resolver ethdb.KeyValueReader) {
 	panic("not implemented")
 }