eth/filters: fix a breaking change and return rpctransaction (#26757)

* eth/filters: fix a breaking change and return rpctransaction

* eth/filters: fix test cases

---------
Co-authored-by: Catror <me@catror.com>

eth/filters/api.go

@@ -39,6 +39,7 @@ type filter struct {
 	typ      Type
 	deadline *time.Timer // filter is inactive when deadline triggers
 	hashes   []common.Hash
+	fullTx   bool
 	txs      []*types.Transaction
 	crit     FilterCriteria
 	logs     []*types.Log
@@ -103,14 +104,14 @@ func (api *FilterAPI) timeoutLoop(timeout time.Duration) {
 //
 // It is part of the filter package because this filter can be used through the
 // `eth_getFilterChanges` polling method that is also used for log filters.
-func (api *FilterAPI) NewPendingTransactionFilter() rpc.ID {
+func (api *FilterAPI) NewPendingTransactionFilter(fullTx *bool) rpc.ID {
 	var (
 		pendingTxs   = make(chan []*types.Transaction)
 		pendingTxSub = api.events.SubscribePendingTxs(pendingTxs)
 	)
 
 	api.filtersMu.Lock()
-	api.filters[pendingTxSub.ID] = &filter{typ: PendingTransactionsSubscription, deadline: time.NewTimer(api.timeout), txs: make([]*types.Transaction, 0), s: pendingTxSub}
+	api.filters[pendingTxSub.ID] = &filter{typ: PendingTransactionsSubscription, fullTx: fullTx != nil && *fullTx, deadline: time.NewTimer(api.timeout), txs: make([]*types.Transaction, 0), s: pendingTxSub}
 	api.filtersMu.Unlock()
 
 	go func() {
@@ -412,6 +413,9 @@ func (api *FilterAPI) GetFilterChanges(id rpc.ID) (interface{}, error) {
 	api.filtersMu.Lock()
 	defer api.filtersMu.Unlock()
 
+	chainConfig := api.sys.backend.ChainConfig()
+	latest := api.sys.backend.CurrentHeader()
+
 	if f, found := api.filters[id]; found {
 		if !f.deadline.Stop() {
 			// timer expired but filter is not yet removed in timeout loop
@@ -426,9 +430,21 @@ func (api *FilterAPI) GetFilterChanges(id rpc.ID) (interface{}, error) {
 			f.hashes = nil
 			return returnHashes(hashes), nil
 		case PendingTransactionsSubscription:
-			txs := f.txs
-			f.txs = nil
-			return txs, nil
+			if f.fullTx {
+				txs := make([]*ethapi.RPCTransaction, 0, len(f.txs))
+				for _, tx := range f.txs {
+					txs = append(txs, ethapi.NewRPCPendingTransaction(tx, latest, chainConfig))
+				}
+				f.txs = nil
+				return txs, nil
+			} else {
+				hashes := make([]common.Hash, 0, len(f.txs))
+				for _, tx := range f.txs {
+					hashes = append(hashes, tx.Hash())
+				}
+				f.txs = nil
+				return hashes, nil
+			}
 		case LogsSubscription, MinedAndPendingLogsSubscription:
 			logs := f.logs
 			f.logs = nil

eth/filters/filter_system_test.go

@@ -37,6 +37,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/internal/ethapi"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 )
@@ -52,11 +53,12 @@ type testBackend struct {
 }
 
 func (b *testBackend) ChainConfig() *params.ChainConfig {
-	panic("implement me")
+	return params.TestChainConfig
 }
 
 func (b *testBackend) CurrentHeader() *types.Header {
-	panic("implement me")
+	hdr, _ := b.HeaderByNumber(context.TODO(), rpc.LatestBlockNumber)
+	return hdr
 }
 
 func (b *testBackend) ChainDb() ethdb.Database {
@@ -256,10 +258,10 @@ func TestPendingTxFilter(t *testing.T) {
 			types.NewTransaction(4, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
 		}
 
-		txs []*types.Transaction
+		hashes []common.Hash
 	)
 
-	fid0 := api.NewPendingTransactionFilter()
+	fid0 := api.NewPendingTransactionFilter(nil)
 
 	time.Sleep(1 * time.Second)
 	backend.txFeed.Send(core.NewTxsEvent{Txs: transactions})
@@ -271,7 +273,64 @@ func TestPendingTxFilter(t *testing.T) {
 			t.Fatalf("Unable to retrieve logs: %v", err)
 		}
 
-		tx := results.([]*types.Transaction)
+		h := results.([]common.Hash)
+		hashes = append(hashes, h...)
+		if len(hashes) >= len(transactions) {
+			break
+		}
+		// check timeout
+		if time.Now().After(timeout) {
+			break
+		}
+
+		time.Sleep(100 * time.Millisecond)
+	}
+
+	if len(hashes) != len(transactions) {
+		t.Errorf("invalid number of transactions, want %d transactions(s), got %d", len(transactions), len(hashes))
+		return
+	}
+	for i := range hashes {
+		if hashes[i] != transactions[i].Hash() {
+			t.Errorf("hashes[%d] invalid, want %x, got %x", i, transactions[i].Hash(), hashes[i])
+		}
+	}
+}
+
+// TestPendingTxFilterFullTx tests whether pending tx filters retrieve all pending transactions that are posted to the event mux.
+func TestPendingTxFilterFullTx(t *testing.T) {
+	t.Parallel()
+
+	var (
+		db           = rawdb.NewMemoryDatabase()
+		backend, sys = newTestFilterSystem(t, db, Config{})
+		api          = NewFilterAPI(sys, false)
+
+		transactions = []*types.Transaction{
+			types.NewTransaction(0, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
+			types.NewTransaction(1, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
+			types.NewTransaction(2, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
+			types.NewTransaction(3, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
+			types.NewTransaction(4, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
+		}
+
+		txs []*ethapi.RPCTransaction
+	)
+
+	fullTx := true
+	fid0 := api.NewPendingTransactionFilter(&fullTx)
+
+	time.Sleep(1 * time.Second)
+	backend.txFeed.Send(core.NewTxsEvent{Txs: transactions})
+
+	timeout := time.Now().Add(1 * time.Second)
+	for {
+		results, err := api.GetFilterChanges(fid0)
+		if err != nil {
+			t.Fatalf("Unable to retrieve logs: %v", err)
+		}
+
+		tx := results.([]*ethapi.RPCTransaction)
 		txs = append(txs, tx...)
 		if len(txs) >= len(transactions) {
 			break
@@ -289,8 +348,8 @@ func TestPendingTxFilter(t *testing.T) {
 		return
 	}
 	for i := range txs {
-		if txs[i].Hash() != transactions[i].Hash() {
-			t.Errorf("hashes[%d] invalid, want %x, got %x", i, transactions[i].Hash(), txs[i].Hash())
+		if txs[i].Hash != transactions[i].Hash() {
+			t.Errorf("hashes[%d] invalid, want %x, got %x", i, transactions[i].Hash(), txs[i].Hash)
 		}
 	}
 }
@@ -854,15 +913,15 @@ func TestPendingTxFilterDeadlock(t *testing.T) {
 	// timeout either in 100ms or 200ms
 	fids := make([]rpc.ID, 20)
 	for i := 0; i < len(fids); i++ {
-		fid := api.NewPendingTransactionFilter()
+		fid := api.NewPendingTransactionFilter(nil)
 		fids[i] = fid
 		// Wait for at least one tx to arrive in filter
 		for {
-			txs, err := api.GetFilterChanges(fid)
+			hashes, err := api.GetFilterChanges(fid)
 			if err != nil {
 				t.Fatalf("Filter should exist: %v\n", err)
 			}
-			if len(txs.([]*types.Transaction)) > 0 {
+			if len(hashes.([]common.Hash)) > 0 {
 				break
 			}
 			runtime.Gosched()