remove unneeded bc methods

cmd/geth/config.go

@@ -156,7 +156,6 @@ func makeFullNode(ctx *cli.Context) *node.Node {
 	utils.RegisterEthService(stack, &cfg.Eth)
 
 	if ctx.GlobalBool(utils.StateDiffFlag.Name) {
-		cfg.Eth.StateDiff = true
 		utils.RegisterStateDiffService(stack)
 	}
 

core/blockchain.go

@@ -115,7 +115,6 @@ type CacheConfig struct {
 	TrieDirtyLimit      int           // Memory limit (MB) at which to start flushing dirty trie nodes to disk
 	TrieDirtyDisabled   bool          // Whether to disable trie write caching and GC altogether (archive node)
 	TrieTimeLimit       time.Duration // Time limit after which to flush the current in-memory trie to disk
-	ProcessingStateDiffs bool          // Whether statediffs processing should be taken into a account before a trie is pruned
 }
 
 // BlockChain represents the canonical chain given a database with a genesis
@@ -178,8 +177,6 @@ type BlockChain struct {
 	badBlocks       *lru.Cache                     // Bad block cache
 	shouldPreserve  func(*types.Block) bool        // Function used to determine whether should preserve the given block.
 	terminateInsert func(common.Hash, uint64) bool // Testing hook used to terminate ancient receipt chain insertion.
-
-	stateDiffsProcessed map[common.Hash]int
 }
 
 // NewBlockChain returns a fully initialised block chain using information
@@ -200,7 +197,6 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
 	txLookupCache, _ := lru.New(txLookupCacheLimit)
 	futureBlocks, _ := lru.New(maxFutureBlocks)
 	badBlocks, _ := lru.New(badBlockLimit)
-	stateDiffsProcessed := make(map[common.Hash]int)
 	bc := &BlockChain{
 		chainConfig:    chainConfig,
 		cacheConfig:    cacheConfig,
@@ -218,7 +214,6 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
 		engine:         engine,
 		vmConfig:       vmConfig,
 		badBlocks:      badBlocks,
-		stateDiffsProcessed: stateDiffsProcessed,
 	}
 	bc.validator = NewBlockValidator(chainConfig, bc, engine)
 	bc.prefetcher = newStatePrefetcher(chainConfig, bc, engine)
@@ -1294,11 +1289,6 @@ func (bc *BlockChain) writeKnownBlock(block *types.Block) error {
 	return nil
 }
 
-func (bc *BlockChain) AddToStateDiffProcessedCollection(hash common.Hash) {
-	count := bc.stateDiffsProcessed[hash]
-	bc.stateDiffsProcessed[hash] = count + 1
-}
-
 // WriteBlockWithState writes the block and all associated state to the database.
 func (bc *BlockChain) WriteBlockWithState(block *types.Block, receipts []*types.Receipt, logs []*types.Log, state *state.StateDB, emitHeadEvent bool) (status WriteStatus, err error) {
 	bc.chainmu.Lock()
@@ -1390,18 +1380,6 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 					bc.triegc.Push(root, number)
 					break
 				}
-				if bc.cacheConfig.ProcessingStateDiffs {
-					if !bc.rootAllowedToBeDereferenced(root.(common.Hash)) {
-						bc.triegc.Push(root, number)
-						break
-					} else {
-						log.Debug("Current root found in stateDiffsProcessed collection with a count of 2, okay to dereference",
-							"root", root.(common.Hash).Hex(),
-							"blockNumber", uint64(-number),
-							"size of stateDiffsProcessed", len(bc.stateDiffsProcessed))
-						delete(bc.stateDiffsProcessed, root.(common.Hash))
-					}
-				}
 				log.Debug("Dereferencing", "root", root.(common.Hash).Hex())
 				triedb.Dereference(root.(common.Hash))
 			}
@@ -1461,15 +1439,6 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 	return status, nil
 }
 
-// since we need the state tries of the current block and its parent in-memory
-// in order to process statediffs, we should avoid dereferencing roots until
-// its statediff and its child have been processed
-func (bc *BlockChain) rootAllowedToBeDereferenced(root common.Hash) bool {
-	diffProcessedForSelfAndChildCount := 2
-	count := bc.stateDiffsProcessed[root]
-	return count >= diffProcessedForSelfAndChildCount
-}
-
 // addFutureBlock checks if the block is within the max allowed window to get
 // accepted for future processing, and returns an error if the block is too far
 // ahead and was not added.

core/blockchain_test.go

@@ -2363,81 +2363,6 @@ func TestDeleteCreateRevert(t *testing.T) {
 	}
 }
 
-func TestProcessingStateDiffs(t *testing.T) {
-	defaultTrieCleanCache := 256
-	defaultTrieDirtyCache := 256
-	defaultTrieTimeout := 60 * time.Minute
-	cacheConfig := &CacheConfig{
-		TrieDirtyDisabled:    false,
-		TrieCleanLimit:       defaultTrieCleanCache,
-		TrieDirtyLimit:       defaultTrieDirtyCache,
-		TrieTimeLimit:        defaultTrieTimeout,
-		ProcessingStateDiffs: true,
-	}
-	db := rawdb.NewMemoryDatabase()
-	genesis := new(Genesis).MustCommit(db)
-	numberOfBlocks := TriesInMemory
-	engine := ethash.NewFaker()
-	blockchain, _ := NewBlockChain(db, cacheConfig, params.AllEthashProtocolChanges, engine, vm.Config{}, nil)
-	blocks := makeBlockChain(genesis, numberOfBlocks+1, engine, db, canonicalSeed)
-	_, err := blockchain.InsertChain(blocks)
-	if err != nil {
-		t.Fatalf("failed to create pristine chain: %v", err)
-	}
-	defer blockchain.Stop()
-
-	//when adding a root hash to the collection, it will increment the count
-	firstStateRoot := blocks[0].Root()
-	blockchain.AddToStateDiffProcessedCollection(firstStateRoot)
-	value, ok := blockchain.stateDiffsProcessed[firstStateRoot]
-	if !ok {
-		t.Error("state root not found in collection")
-	}
-	if value != 1 {
-		t.Error("state root count not correct", "want", 1, "got", value)
-	}
-
-	blockchain.AddToStateDiffProcessedCollection(firstStateRoot)
-	value, ok = blockchain.stateDiffsProcessed[firstStateRoot]
-	if !ok {
-		t.Error("state root not found in collection")
-	}
-	if value != 2 {
-		t.Error("state root count not correct", "want", 2, "got", value)
-	}
-
-	moreBlocks := makeBlockChain(blocks[len(blocks)-1], 1, engine, db, canonicalSeed)
-	_, err = blockchain.InsertChain(moreBlocks)
-	if err != nil {
-		t.Error(err)
-	}
-
-	//a root hash can be dereferenced when it's state diff and it's child's state diff have been processed
-	//(i.e. it has a count of 2 in stateDiffsProcessed)
-	nodes := blockchain.stateCache.TrieDB().Nodes()
-	if containsRootHash(nodes, firstStateRoot) {
-		t.Errorf("stateRoot %s in nodes, want: %t, got: %t", firstStateRoot.Hex(), false, true)
-	}
-
-	//a root hash should still be in the in-mem db if it's child's state diff hasn't yet been processed
-	//(i.e. it has a count of 1 stateDiffsProcessed)
-	secondStateRoot := blocks[1].Root()
-	blockchain.AddToStateDiffProcessedCollection(secondStateRoot)
-	if !containsRootHash(nodes, secondStateRoot) {
-		t.Errorf("stateRoot %s in nodes, want: %t, got: %t", secondStateRoot.Hex(), true, false)
-	}
-
-	//the stateDiffsProcessed collection is cleaned up once a hash has been dereferenced
-	_, ok = blockchain.stateDiffsProcessed[firstStateRoot]
-	if ok {
-		t.Errorf("stateRoot %s in stateDiffsProcessed collection, want: %t, got: %t",
-			firstStateRoot.Hex(),
-			false,
-			ok,
-		)
-	}
-}
-
 func containsRootHash(collection []common.Hash, hash common.Hash) bool {
 	for _, n := range collection {
 		if n == hash {

eth/backend.go

@@ -184,7 +184,6 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 			TrieDirtyLimit:      config.TrieDirtyCache,
 			TrieDirtyDisabled:   config.NoPruning,
 			TrieTimeLimit:       config.TrieTimeout,
-			ProcessingStateDiffs: config.StateDiff,
 		}
 	)
 	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, chainConfig, eth.engine, vmConfig, eth.shouldPreserve)

eth/config.go

@@ -61,8 +61,6 @@ var DefaultConfig = Config{
 		Blocks:     20,
 		Percentile: 60,
 	},
-
-	StateDiff: false,
 }
 
 func init() {
@@ -166,6 +164,4 @@ type Config struct {
 
 	// MuirGlacier block override (TODO: remove after the fork)
 	OverrideMuirGlacier *big.Int `toml:",omitempty"`
-
-	StateDiff bool
 }

statediff/testhelpers/mocks/blockchain.go

@@ -38,9 +38,6 @@ type BlockChain struct {
 	TDByHash               map[common.Hash]*big.Int
 }
 
-// AddToStateDiffProcessedCollection mock method
-func (blockChain *BlockChain) AddToStateDiffProcessedCollection(hash common.Hash) {}
-
 // SetBlocksForHashes mock method
 func (blockChain *BlockChain) SetBlocksForHashes(blocks map[common.Hash]*types.Block) {
 	if blockChain.blocksToReturnByHash == nil {