eth/filters: fix getLogs for pending block (ethereum#24949)

* eth/filters: fix pending for getLogs

* add pending method to test backend

* fix block range validation

Author: s1na

accounts/abi/bind/backends/simulated.go

@@ -67,6 +67,7 @@ type SimulatedBackend struct {
 	stuckTransactions types.Transactions // holds onto all txes that don't go into the pending block due to low gas
 	pendingBlock      *types.Block       // Currently pending block that will be imported on request
 	pendingState      *state.StateDB     // Currently pending state that will be the active on request
+	pendingReceipts   types.Receipts     // Currently receipts for the pending block
 
 	events *filters.EventSystem // Event system for filtering log events live
 
@@ -87,8 +88,8 @@ func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.Genesis
 		database:   database,
 		blockchain: blockchain,
 		config:     genesis.Config,
-		events:     filters.NewEventSystem(&filterBackend{database, blockchain}, false),
 	}
+	backend.events = filters.NewEventSystem(&filterBackend{database, blockchain, backend}, false)
 	backend.rollback(blockchain.CurrentBlock())
 	return backend
 }
@@ -690,7 +691,7 @@ func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transa
 	}
 	var remainingTxes types.Transactions
 	// Include tx in chain
-	blocks, _ := core.GenerateChain(b.config, block, ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) {
+	blocks, receipts := core.GenerateChain(b.config, block, ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) {
 		for _, tx := range b.pendingBlock.Transactions() {
 			// if market gas price is not set or tx gas price is lower than the set market gas price
 			if b.marketGasPrice == nil || b.marketGasPrice.Cmp(tx.GasPrice()) <= 0 {
@@ -711,6 +712,7 @@ func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transa
 	b.pendingBlock = blocks[0]
 	b.pendingState, _ = state.New(b.pendingBlock.Root(), stateDB.Database(), nil)
 	b.stuckTransactions = remainingTxes
+	b.pendingReceipts = receipts[0]
 
 	return nil
 }
@@ -723,7 +725,7 @@ func (b *SimulatedBackend) FilterLogs(ctx context.Context, query ethereum.Filter
 	var filter *filters.Filter
 	if query.BlockHash != nil {
 		// Block filter requested, construct a single-shot filter
-		filter = filters.NewBlockFilter(&filterBackend{b.database, b.blockchain}, *query.BlockHash, query.Addresses, query.Topics)
+		filter = filters.NewBlockFilter(&filterBackend{b.database, b.blockchain, b}, *query.BlockHash, query.Addresses, query.Topics)
 	} else {
 		// Initialize unset filter boundaries to run from genesis to chain head
 		from := int64(0)
@@ -735,7 +737,7 @@ func (b *SimulatedBackend) FilterLogs(ctx context.Context, query ethereum.Filter
 			to = query.ToBlock.Int64()
 		}
 		// Construct the range filter
-		filter = filters.NewRangeFilter(&filterBackend{b.database, b.blockchain}, from, to, query.Addresses, query.Topics)
+		filter = filters.NewRangeFilter(&filterBackend{b.database, b.blockchain, b}, from, to, query.Addresses, query.Topics)
 	}
 	// Run the filter and return all the logs
 	logs, err := filter.Logs(ctx)
@@ -856,8 +858,9 @@ func (m callMsg) AccessList() types.AccessList { return m.CallMsg.AccessList }
 // filterBackend implements filters.Backend to support filtering for logs without
 // taking bloom-bits acceleration structures into account.
 type filterBackend struct {
-	db ethdb.Database
-	bc *core.BlockChain
+	db      ethdb.Database
+	bc      *core.BlockChain
+	backend *SimulatedBackend
 }
 
 func (fb *filterBackend) ChainDb() ethdb.Database  { return fb.db }
@@ -874,6 +877,10 @@ func (fb *filterBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*t
 	return fb.bc.GetHeaderByHash(hash), nil
 }
 
+func (fb *filterBackend) PendingBlockAndReceipts() (*types.Block, types.Receipts) {
+	return fb.backend.pendingBlock, fb.backend.pendingReceipts
+}
+
 func (fb *filterBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) {
 	number := rawdb.ReadHeaderNumber(fb.db, hash)
 	if number == nil {

eth/filters/filter.go

@@ -36,6 +36,7 @@ type Backend interface {
 	HeaderByHash(ctx context.Context, blockHash common.Hash) (*types.Header, error)
 	GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error)
 	GetLogs(ctx context.Context, blockHash common.Hash) ([][]*types.Log, error)
+	PendingBlockAndReceipts() (*types.Block, types.Receipts)
 
 	SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
 	SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription
@@ -128,26 +129,35 @@ func (f *Filter) Logs(ctx context.Context) ([]*types.Log, error) {
 		}
 		return f.blockLogs(ctx, header)
 	}
+	// Short-cut if all we care about is pending logs
+	if f.begin == rpc.PendingBlockNumber.Int64() {
+		if f.end != rpc.PendingBlockNumber.Int64() {
+			return nil, errors.New("invalid block range")
+		}
+		return f.pendingLogs()
+	}
 	// Figure out the limits of the filter range
 	header, _ := f.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
 	if header == nil {
 		return nil, nil
 	}
-	head := header.Number.Uint64()
-
-	if f.begin == -1 {
+	var (
+		head    = header.Number.Uint64()
+		end     = uint64(f.end)
+		pending = f.end == rpc.PendingBlockNumber.Int64()
+	)
+	if f.begin == rpc.LatestBlockNumber.Int64() {
 		f.begin = int64(head)
 	}
-	end := uint64(f.end)
-	if f.end == -1 {
+	if f.end == rpc.LatestBlockNumber.Int64() || f.end == rpc.PendingBlockNumber.Int64() {
 		end = head
 	}
 	// Gather all indexed logs, and finish with non indexed ones
 	var (
-		logs []*types.Log
-		err  error
+		logs           []*types.Log
+		err            error
+		size, sections = f.backend.BloomStatus()
 	)
-	size, sections := f.backend.BloomStatus()
 	if indexed := sections * size; indexed > uint64(f.begin) {
 		if indexed > end {
 			logs, err = f.indexedLogs(ctx, end)
@@ -160,6 +170,13 @@ func (f *Filter) Logs(ctx context.Context) ([]*types.Log, error) {
 	}
 	rest, err := f.unindexedLogs(ctx, end)
 	logs = append(logs, rest...)
+	if pending {
+		pendingLogs, err := f.pendingLogs()
+		if err != nil {
+			return nil, err
+		}
+		logs = append(logs, pendingLogs...)
+	}
 	return logs, err
 }
 
@@ -272,6 +289,19 @@ func (f *Filter) checkMatches(ctx context.Context, header *types.Header) (logs [
 	return nil, nil
 }
 
+// pendingLogs returns the logs matching the filter criteria within the pending block.
+func (f *Filter) pendingLogs() ([]*types.Log, error) {
+	block, receipts := f.backend.PendingBlockAndReceipts()
+	if bloomFilter(block.Bloom(), f.addresses, f.topics) {
+		var unfiltered []*types.Log
+		for _, r := range receipts {
+			unfiltered = append(unfiltered, r.Logs...)
+		}
+		return filterLogs(unfiltered, nil, nil, f.addresses, f.topics), nil
+	}
+	return nil, nil
+}
+
 func includes(addresses []common.Address, a common.Address) bool {
 	for _, addr := range addresses {
 		if addr == a {

eth/filters/filter_system_test.go

@@ -106,6 +106,10 @@ func (b *testBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types
 	return logs, nil
 }
 
+func (b *testBackend) PendingBlockAndReceipts() (*types.Block, types.Receipts) {
+	return nil, nil
+}
+
 func (b *testBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
 	return b.txFeed.Subscribe(ch)
 }

internal/ethapi/backend.go

@@ -65,6 +65,7 @@ type Backend interface {
 	BlockByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Block, error)
 	StateAndHeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*state.StateDB, *types.Header, error)
 	StateAndHeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*state.StateDB, *types.Header, error)
+	PendingBlockAndReceipts() (*types.Block, types.Receipts)
 	GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error)
 	GetTd(ctx context.Context, hash common.Hash) *big.Int
 	GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header, vmConfig *vm.Config) (*vm.EVM, func() error, error)