minor changes/fixes

statediff/builder.go

@@ -23,10 +23,9 @@ import (
 	"bytes"
 	"fmt"
 
-	"github.com/ethereum/go-ethereum/core/types"
-
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -154,14 +153,14 @@ func (sdb *builder) buildStateDiffWithIntermediateStateNodes(args Args, params P
 	// collect a slice of all the intermediate nodes that were touched and exist at B
 	// a map of their leafkey to all the accounts that were touched and exist at B
 	// and a slice of all the paths for the nodes in both of the above sets
-	createdOrUpdatedIntermediateNodes, diffAccountsAtB, diffPathsAtB, err := sdb.createdAndUpdatedState(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}))
+	createdOrUpdatedIntermediateNodes, diffAccountsAtB, diffPathsAtB, err := sdb.createdAndUpdatedStateWithIntermediateNodes(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}))
 	if err != nil {
 		return StateObject{}, fmt.Errorf("error collecting createdAndUpdatedNodes: %v", err)
 	}
 
 	// collect a slice of all the nodes that existed at a path in A that doesn't exist in B
 	// a map of their leafkey to all the accounts that were touched and exist at A
-	deletedNodes, diffAccountsAtA, err := sdb.deletedOrUpdatedState(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}), diffPathsAtB)
+	emptiedPaths, diffAccountsAtA, err := sdb.deletedOrUpdatedState(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}), diffPathsAtB)
 	if err != nil {
 		return StateObject{}, fmt.Errorf("error collecting deletedOrUpdatedNodes: %v", err)
 	}
@@ -191,7 +190,7 @@ func (sdb *builder) buildStateDiffWithIntermediateStateNodes(args Args, params P
 	return StateObject{
 		BlockNumber: args.BlockNumber,
 		BlockHash:   args.BlockHash,
-		Nodes:       append(append(append(updatedAccounts, createdAccounts...), createdOrUpdatedIntermediateNodes...), deletedNodes...),
+		Nodes:       append(append(append(updatedAccounts, createdAccounts...), createdOrUpdatedIntermediateNodes...), emptiedPaths...),
 	}, nil
 }
 
@@ -207,13 +206,15 @@ func (sdb *builder) buildStateDiffWithoutIntermediateStateNodes(args Args, param
 	}
 
 	// collect a map of their leafkey to all the accounts that were touched and exist at B
-	diffAccountsAtB, err := sdb.collectDiffAccounts(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}), params.WatchedAddresses)
+	// and a slice of all the paths for the nodes in both of the above sets
+	diffAccountsAtB, diffPathsAtB, err := sdb.createdAndUpdatedState(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}), params.WatchedAddresses)
 	if err != nil {
 		return StateObject{}, fmt.Errorf("error collecting createdAndUpdatedNodes: %v", err)
 	}
 
-	// collect a map of their leafkey to all the accounts that were touched and exist at A
+	// collect a slice of all the nodes that existed at a path in A that doesn't exist in B
-	diffAccountsAtA, err := sdb.collectDiffAccounts(newTrie.NodeIterator([]byte{}), oldTrie.NodeIterator([]byte{}), params.WatchedAddresses)
+	// a map of their leafkey to all the accounts that were touched and exist at A
+	emptiedPaths, diffAccountsAtA, err := sdb.deletedOrUpdatedState(oldTrie.NodeIterator([]byte{}), newTrie.NodeIterator([]byte{}), diffPathsAtB)
 	if err != nil {
 		return StateObject{}, fmt.Errorf("error collecting deletedOrUpdatedNodes: %v", err)
 	}
@@ -238,23 +239,20 @@ func (sdb *builder) buildStateDiffWithoutIntermediateStateNodes(args Args, param
 	if err != nil {
 		return StateObject{}, fmt.Errorf("error building diff for created accounts: %v", err)
 	}
-	// build the diff nodes for deleted accounts
-	deletedAccounts, err := sdb.buildAccountDeletions(diffAccountsAtA)
-	if err != nil {
-		return StateObject{}, fmt.Errorf("error building diff for deleted accounts: %v", err)
-	}
 
 	// assemble all of the nodes into the statediff object
 	return StateObject{
 		BlockNumber: args.BlockNumber,
 		BlockHash:   args.BlockHash,
-		Nodes:       append(append(updatedAccounts, createdAccounts...), deletedAccounts...),
+		Nodes:       append(append(updatedAccounts, createdAccounts...), emptiedPaths...),
 	}, nil
 }
 
-// collectDiffAccounts returns a mapping of their leafkeys to all the accounts that exist in a different state at B than A
+// createdAndUpdatedState returns
-// restricts the returned set to the watchedAddresses if any are provided
+// a mapping of their leafkeys to all the accounts that exist in a different state at B than A
-func (sdb *builder) collectDiffAccounts(a, b trie.NodeIterator, watchedAddresses []common.Address) (AccountMap, error) {
+// and a slice of the paths for all of the nodes included in both
+func (sdb *builder) createdAndUpdatedState(a, b trie.NodeIterator, watchedAddresses []common.Address) (AccountMap, map[string]bool, error) {
+	diffPathsAtB := make(map[string]bool)
 	diffAcountsAtB := make(AccountMap)
 	it, _ := trie.NewDifferenceIterator(a, b)
 	for it.Next(true) {
@@ -269,23 +267,22 @@ func (sdb *builder) collectDiffAccounts(a, b trie.NodeIterator, watchedAddresses
 		copy(nodePath, it.Path())
 		node, err := sdb.stateCache.TrieDB().Node(it.Hash())
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		var nodeElements []interface{}
 		if err := rlp.DecodeBytes(node, &nodeElements); err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		ty, err := CheckKeyType(nodeElements)
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
-		switch ty {
+		if ty == Leaf {
-		case Leaf:
 			// created vs updated is important for leaf nodes since we need to diff their storage
 			// so we need to map all changed accounts at B to their leafkey, since account can change pathes but not leafkey
 			var account state.Account
 			if err := rlp.DecodeBytes(nodeElements[1].([]byte), &account); err != nil {
-				return nil, fmt.Errorf("error decoding account for leaf node at path %x nerror: %v", nodePath, err)
+				return nil, nil, fmt.Errorf("error decoding account for leaf node at path %x nerror: %v", nodePath, err)
 			}
 			partialPath := trie.CompactToHex(nodeElements[0].([]byte))
 			valueNodePath := append(nodePath, partialPath...)
@@ -300,19 +297,18 @@ func (sdb *builder) collectDiffAccounts(a, b trie.NodeIterator, watchedAddresses
 					Account:   &account,
 				}
 			}
-		case Extension, Branch:
-			// fall through to next iteration
-		default:
-			return nil, fmt.Errorf("unexpected node type %s", ty)
 		}
+		// add both intermediate and leaf node paths to the list of diffPathsAtB
+		diffPathsAtB[common.Bytes2Hex(nodePath)] = true
 	}
-	return diffAcountsAtB, nil
+	return diffAcountsAtB, diffPathsAtB, nil
 }
 
-// createdAndUpdatedState returns a slice of all the intermediate nodes that exist in a different state at B than A
+// createdAndUpdatedStateWithIntermediateNodes returns
+// a slice of all the intermediate nodes that exist in a different state at B than A
 // a mapping of their leafkeys to all the accounts that exist in a different state at B than A
 // and a slice of the paths for all of the nodes included in both
-func (sdb *builder) createdAndUpdatedState(a, b trie.NodeIterator) ([]StateNode, AccountMap, map[string]bool, error) {
+func (sdb *builder) createdAndUpdatedStateWithIntermediateNodes(a, b trie.NodeIterator) ([]StateNode, AccountMap, map[string]bool, error) {
 	createdOrUpdatedIntermediateNodes := make([]StateNode, 0)
 	diffPathsAtB := make(map[string]bool)
 	diffAcountsAtB := make(AccountMap)
@@ -375,10 +371,10 @@ func (sdb *builder) createdAndUpdatedState(a, b trie.NodeIterator) ([]StateNode,
 	return createdOrUpdatedIntermediateNodes, diffAcountsAtB, diffPathsAtB, nil
 }
 
-// deletedOrUpdatedState returns a slice of all the nodes that exist at A but not at B
+// deletedOrUpdatedState returns a slice of all the pathes that are emptied at B
 // and a mapping of their leafkeys to all the accounts that exist in a different state at A than B
 func (sdb *builder) deletedOrUpdatedState(a, b trie.NodeIterator, diffPathsAtB map[string]bool) ([]StateNode, AccountMap, error) {
-	deletedNodes := make([]StateNode, 0)
+	emptiedPaths := make([]StateNode, 0)
 	diffAccountAtA := make(AccountMap)
 	it, _ := trie.NewDifferenceIterator(b, a)
 	for it.Next(true) {
@@ -395,10 +391,10 @@ func (sdb *builder) deletedOrUpdatedState(a, b trie.NodeIterator, diffPathsAtB m
 		// that means the node at this path was deleted (or moved) in B
 		// emit an empty "removed" diff to signify as such
 		if _, ok := diffPathsAtB[common.Bytes2Hex(nodePath)]; !ok {
-			deletedNodes = append(deletedNodes, StateNode{
+			emptiedPaths = append(emptiedPaths, StateNode{
-				NodeType:  Removed,
 				Path:      nodePath,
 				NodeValue: []byte{},
+				NodeType:  Removed,
 			})
 		}
 		node, err := sdb.stateCache.TrieDB().Node(it.Hash())
@@ -437,7 +433,7 @@ func (sdb *builder) deletedOrUpdatedState(a, b trie.NodeIterator, diffPathsAtB m
 			return nil, nil, fmt.Errorf("unexpected node type %s", ty)
 		}
 	}
-	return deletedNodes, diffAccountAtA, nil
+	return emptiedPaths, diffAccountAtA, nil
 }
 
 // buildAccountUpdates uses the account diffs maps for A => B and B => A and the known intersection of their leafkeys
@@ -494,21 +490,6 @@ func (sdb *builder) buildAccountCreations(accounts AccountMap, watchedStorageKey
 	return accountDiffs, nil
 }
 
-// buildAccountDeletions returns the state diff "removed" empty node objects
-// to represent when an account exists at A but not at B
-func (sdb *builder) buildAccountDeletions(accounts AccountMap) ([]StateNode, error) {
-	accountDiffs := make([]StateNode, 0, len(accounts))
-	for _, val := range accounts {
-		// For account deletions, we can not have any storage or the account would not be deleted
-		accountDiffs = append(accountDiffs, StateNode{
-			NodeType:  Removed,
-			Path:      val.Path,
-			NodeValue: []byte{},
-		})
-	}
-	return accountDiffs, nil
-}
-
 // buildStorageNodesEventual builds the storage diff node objects for a created account
 // i.e. it returns all the storage nodes at this state, since there is no previous state
 func (sdb *builder) buildStorageNodesEventual(sr common.Hash, watchedStorageKeys []common.Hash, intermediateNodes bool) ([]StorageNode, error) {

statediff/builder_test.go

@@ -1968,12 +1968,11 @@ func TestBuilderWithMovedAccountOnlyLeafs(t *testing.T) {
 						NodeType:  statediff.Removed,
 						NodeValue: []byte{},
 					},
-					// For accounts that move up a level due to the deletion of the only other child account of a shared parent branch node,
+					{
-					// the leaf-only diffing process emits a node for the account at the new path
+						Path:      []byte{'\x00'},
-					// but does not emit a "removed" node object for the now empty path
+						NodeType:  statediff.Removed,
-					// Fix this, not a major issue since if you are not watching intermediate nodes you aren't worried about the complete picture in the first place
+						NodeValue: []byte{},
-					// One solution is to simply use the same process as when including intermediate nodes and simply discard the intermediate nodes
+					},
-					// But that method is significantly more memory intensive
 				},
 			},
 		},

statediff/mainnet_tests/builder_test.go

@@ -479,6 +479,8 @@ func TestBuilderOnMainnetBlocks(t *testing.T) {
 		startingArguments statediff.Args
 		expected          *statediff.StateObject
 	}{
+		// note that block0 (genesis) has over 1000 nodes due to the pre-allocation for the crowd-sale
+		// it is not feasible to write a unit test of that size at this time
 		{
 			"testBlock1",
 			//10000 transferred from testBankAddress to account1Addr

statediff/service.go

@@ -172,7 +172,7 @@ func (sds *Service) streamStateDiff(currentBlock *types.Block, parentRoot common
 		for id, sub := range subs {
 			select {
 			case sub.PayloadChan <- *payload:
-				log.Debug(fmt.Sprintf("sending statediff payload to subscription %s", id))
+				log.Debug(fmt.Sprintf("sending statediff payload at head height %d to subscription %s", currentBlock.Number(), id))
 			default:
 				log.Info(fmt.Sprintf("unable to send statediff payload to subscription %s; channel has no receiver", id))
 			}
@@ -181,6 +181,18 @@ func (sds *Service) streamStateDiff(currentBlock *types.Block, parentRoot common
 	sds.Unlock()
 }
 
+// StateDiffAt returns a state diff object payload at the specific blockheight
+// This operation cannot be performed back past the point of db pruning; it requires an archival node for historical data
+func (sds *Service) StateDiffAt(blockNumber uint64, params Params) (*Payload, error) {
+	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
+	log.Info(fmt.Sprintf("sending state diff at block %d", blockNumber))
+	if blockNumber == 0 {
+		return sds.processStateDiff(currentBlock, common.Hash{}, params)
+	}
+	parentBlock := sds.BlockChain.GetBlockByHash(currentBlock.ParentHash())
+	return sds.processStateDiff(currentBlock, parentBlock.Root(), params)
+}
+
 // processStateDiff method builds the state diff payload from the current block, parent state root, and provided params
 func (sds *Service) processStateDiff(currentBlock *types.Block, parentRoot common.Hash, params Params) (*Payload, error) {
 	stateDiff, err := sds.Builder.BuildStateDiffObject(Args{
@@ -196,28 +208,52 @@ func (sds *Service) processStateDiff(currentBlock *types.Block, parentRoot commo
 	if err != nil {
 		return nil, err
 	}
-	payload := Payload{
+	return sds.newPayload(stateDiffRlp, currentBlock, params)
-		StateObjectRlp: stateDiffRlp,
+}
+
+func (sds *Service) newPayload(stateObject []byte, block *types.Block, params Params) (*Payload, error) {
+	payload := &Payload{
+		StateObjectRlp: stateObject,
 	}
 	if params.IncludeBlock {
 		blockBuff := new(bytes.Buffer)
-		if err = currentBlock.EncodeRLP(blockBuff); err != nil {
+		if err := block.EncodeRLP(blockBuff); err != nil {
 			return nil, err
 		}
 		payload.BlockRlp = blockBuff.Bytes()
 	}
 	if params.IncludeTD {
-		payload.TotalDifficulty = sds.BlockChain.GetTdByHash(currentBlock.Hash())
+		payload.TotalDifficulty = sds.BlockChain.GetTdByHash(block.Hash())
 	}
 	if params.IncludeReceipts {
 		receiptBuff := new(bytes.Buffer)
-		receipts := sds.BlockChain.GetReceiptsByHash(currentBlock.Hash())
+		receipts := sds.BlockChain.GetReceiptsByHash(block.Hash())
-		if err = rlp.Encode(receiptBuff, receipts); err != nil {
+		if err := rlp.Encode(receiptBuff, receipts); err != nil {
 			return nil, err
 		}
 		payload.ReceiptsRlp = receiptBuff.Bytes()
 	}
-	return &payload, nil
+	return payload, nil
+}
+
+// StateTrieAt returns a state trie object payload at the specified blockheight
+// This operation cannot be performed back past the point of db pruning; it requires an archival node for historical data
+func (sds *Service) StateTrieAt(blockNumber uint64, params Params) (*Payload, error) {
+	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
+	log.Info(fmt.Sprintf("sending state trie at block %d", blockNumber))
+	return sds.processStateTrie(currentBlock, params)
+}
+
+func (sds *Service) processStateTrie(block *types.Block, params Params) (*Payload, error) {
+	stateNodes, err := sds.Builder.BuildStateTrieObject(block)
+	if err != nil {
+		return nil, err
+	}
+	stateTrieRlp, err := rlp.EncodeToBytes(stateNodes)
+	if err != nil {
+		return nil, err
+	}
+	return sds.newPayload(stateTrieRlp, block, params)
 }
 
 // Subscribe is used by the API to subscribe to the service loop
@@ -277,59 +313,6 @@ func (sds *Service) Start(*p2p.Server) error {
 	return nil
 }
 
-// StateDiffAt returns a state diff object payload at the specific blockheight
-// This operation cannot be performed back past the point of db pruning; it requires an archival node for historical data
-func (sds *Service) StateDiffAt(blockNumber uint64, params Params) (*Payload, error) {
-	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
-	log.Info(fmt.Sprintf("sending state diff at %d", blockNumber))
-	if blockNumber == 0 {
-		return sds.processStateDiff(currentBlock, common.Hash{}, params)
-	}
-	parentBlock := sds.BlockChain.GetBlockByHash(currentBlock.ParentHash())
-	return sds.processStateDiff(currentBlock, parentBlock.Root(), params)
-}
-
-// StateTrieAt returns a state trie object payload at the specified blockheight
-// This operation cannot be performed back past the point of db pruning; it requires an archival node for historical data
-func (sds *Service) StateTrieAt(blockNumber uint64, params Params) (*Payload, error) {
-	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
-	log.Info(fmt.Sprintf("sending state trie at %d", blockNumber))
-	return sds.stateTrieAt(currentBlock, params)
-}
-
-func (sds *Service) stateTrieAt(block *types.Block, params Params) (*Payload, error) {
-	stateNodes, err := sds.Builder.BuildStateTrieObject(block)
-	if err != nil {
-		return nil, err
-	}
-	stateTrieRlp, err := rlp.EncodeToBytes(stateNodes)
-	if err != nil {
-		return nil, err
-	}
-	payload := Payload{
-		StateObjectRlp: stateTrieRlp,
-	}
-	if params.IncludeBlock {
-		blockBuff := new(bytes.Buffer)
-		if err = block.EncodeRLP(blockBuff); err != nil {
-			return nil, err
-		}
-		payload.BlockRlp = blockBuff.Bytes()
-	}
-	if params.IncludeTD {
-		payload.TotalDifficulty = sds.BlockChain.GetTdByHash(block.Hash())
-	}
-	if params.IncludeReceipts {
-		receiptBuff := new(bytes.Buffer)
-		receipts := sds.BlockChain.GetReceiptsByHash(block.Hash())
-		if err = rlp.Encode(receiptBuff, receipts); err != nil {
-			return nil, err
-		}
-		payload.ReceiptsRlp = receiptBuff.Bytes()
-	}
-	return &payload, nil
-}
-
 // Stop is used to close down the service
 func (sds *Service) Stop() error {
 	log.Info("Stopping statediff service")

statediff/testhelpers/mocks/service.go

@@ -118,6 +118,17 @@ func (sds *MockStateDiffService) streamStateDiff(currentBlock *types.Block, pare
 	sds.Unlock()
 }
 
+// StateDiffAt mock method
+func (sds *MockStateDiffService) StateDiffAt(blockNumber uint64, params statediff.Params) (*statediff.Payload, error) {
+	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
+	log.Info(fmt.Sprintf("sending state diff at %d", blockNumber))
+	if blockNumber == 0 {
+		return sds.processStateDiff(currentBlock, common.Hash{}, params)
+	}
+	parentBlock := sds.BlockChain.GetBlockByHash(currentBlock.ParentHash())
+	return sds.processStateDiff(currentBlock, parentBlock.Root(), params)
+}
+
 // processStateDiff method builds the state diff payload from the current block, parent state root, and provided params
 func (sds *MockStateDiffService) processStateDiff(currentBlock *types.Block, parentRoot common.Hash, params statediff.Params) (*statediff.Payload, error) {
 	stateDiff, err := sds.Builder.BuildStateDiffObject(statediff.Args{
@@ -133,28 +144,51 @@ func (sds *MockStateDiffService) processStateDiff(currentBlock *types.Block, par
 	if err != nil {
 		return nil, err
 	}
-	payload := statediff.Payload{
+	return sds.newPayload(stateDiffRlp, currentBlock, params)
-		StateObjectRlp: stateDiffRlp,
+}
+
+func (sds *MockStateDiffService) newPayload(stateObject []byte, block *types.Block, params statediff.Params) (*statediff.Payload, error) {
+	payload := &statediff.Payload{
+		StateObjectRlp: stateObject,
 	}
 	if params.IncludeBlock {
 		blockBuff := new(bytes.Buffer)
-		if err = currentBlock.EncodeRLP(blockBuff); err != nil {
+		if err := block.EncodeRLP(blockBuff); err != nil {
 			return nil, err
 		}
 		payload.BlockRlp = blockBuff.Bytes()
 	}
 	if params.IncludeTD {
-		payload.TotalDifficulty = sds.BlockChain.GetTdByHash(currentBlock.Hash())
+		payload.TotalDifficulty = sds.BlockChain.GetTdByHash(block.Hash())
 	}
 	if params.IncludeReceipts {
 		receiptBuff := new(bytes.Buffer)
-		receipts := sds.BlockChain.GetReceiptsByHash(currentBlock.Hash())
+		receipts := sds.BlockChain.GetReceiptsByHash(block.Hash())
-		if err = rlp.Encode(receiptBuff, receipts); err != nil {
+		if err := rlp.Encode(receiptBuff, receipts); err != nil {
 			return nil, err
 		}
 		payload.ReceiptsRlp = receiptBuff.Bytes()
 	}
-	return &payload, nil
+	return payload, nil
+}
+
+// StateTrieAt mock method
+func (sds *MockStateDiffService) StateTrieAt(blockNumber uint64, params statediff.Params) (*statediff.Payload, error) {
+	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
+	log.Info(fmt.Sprintf("sending state trie at %d", blockNumber))
+	return sds.stateTrieAt(currentBlock, params)
+}
+
+func (sds *MockStateDiffService) stateTrieAt(block *types.Block, params statediff.Params) (*statediff.Payload, error) {
+	stateNodes, err := sds.Builder.BuildStateTrieObject(block)
+	if err != nil {
+		return nil, err
+	}
+	stateTrieRlp, err := rlp.EncodeToBytes(stateNodes)
+	if err != nil {
+		return nil, err
+	}
+	return sds.newPayload(stateTrieRlp, block, params)
 }
 
 // Subscribe is used by the API to subscribe to the service loop
@@ -193,57 +227,6 @@ func (sds *MockStateDiffService) Unsubscribe(id rpc.ID) error {
 	return nil
 }
 
-// StateDiffAt mock method
-func (sds *MockStateDiffService) StateDiffAt(blockNumber uint64, params statediff.Params) (*statediff.Payload, error) {
-	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
-	log.Info(fmt.Sprintf("sending state diff at %d", blockNumber))
-	if blockNumber == 0 {
-		return sds.processStateDiff(currentBlock, common.Hash{}, params)
-	}
-	parentBlock := sds.BlockChain.GetBlockByHash(currentBlock.ParentHash())
-	return sds.processStateDiff(currentBlock, parentBlock.Root(), params)
-}
-
-// StateTrieAt mock method
-func (sds *MockStateDiffService) StateTrieAt(blockNumber uint64, params statediff.Params) (*statediff.Payload, error) {
-	currentBlock := sds.BlockChain.GetBlockByNumber(blockNumber)
-	log.Info(fmt.Sprintf("sending state trie at %d", blockNumber))
-	return sds.stateTrieAt(currentBlock, params)
-}
-
-func (sds *MockStateDiffService) stateTrieAt(block *types.Block, params statediff.Params) (*statediff.Payload, error) {
-	stateNodes, err := sds.Builder.BuildStateTrieObject(block)
-	if err != nil {
-		return nil, err
-	}
-	stateTrieRlp, err := rlp.EncodeToBytes(stateNodes)
-	if err != nil {
-		return nil, err
-	}
-	payload := statediff.Payload{
-		StateObjectRlp: stateTrieRlp,
-	}
-	if params.IncludeBlock {
-		blockBuff := new(bytes.Buffer)
-		if err = block.EncodeRLP(blockBuff); err != nil {
-			return nil, err
-		}
-		payload.BlockRlp = blockBuff.Bytes()
-	}
-	if params.IncludeTD {
-		payload.TotalDifficulty = sds.BlockChain.GetTdByHash(block.Hash())
-	}
-	if params.IncludeReceipts {
-		receiptBuff := new(bytes.Buffer)
-		receipts := sds.BlockChain.GetReceiptsByHash(block.Hash())
-		if err = rlp.Encode(receiptBuff, receipts); err != nil {
-			return nil, err
-		}
-		payload.ReceiptsRlp = receiptBuff.Bytes()
-	}
-	return &payload, nil
-}
-
 // close is used to close all listening subscriptions
 func (sds *MockStateDiffService) close() {
 	sds.Lock()

statediff/types.go

@@ -85,9 +85,6 @@ type StateObject struct {
 	BlockNumber *big.Int    `json:"blockNumber"     gencodec:"required"`
 	BlockHash   common.Hash `json:"blockHash"       gencodec:"required"`
 	Nodes       []StateNode `json:"nodes"           gencodec:"required"`
-
-	encoded []byte
-	err     error
 }
 
 // StateNode holds the data for a single state diff node
@@ -127,5 +124,5 @@ const (
 	Leaf      NodeType = "Leaf"
 	Extension NodeType = "Extension"
 	Branch    NodeType = "Branch"
-	Removed   NodeType = "Removed" // used to represent nodes which have been deleted (e.g. accounts due to EIp-158)
+	Removed   NodeType = "Removed" // used to represent pathes which have been emptied
 )