eth/filters: fix error when blockHash is used with fromBlock/toBlock (#31877)

This introduces an error when the filter has both `blockHash` and
`fromBlock`/`toBlock`, since these are mutually exclusive. Seems the
tests were actually returning `not found` error, which went undetected
since there was no check on the actual returned error in the test.

eth/filters/api.go

@@ -38,6 +38,8 @@ var (
 	errInvalidTopic           = errors.New("invalid topic(s)")
 	errFilterNotFound         = errors.New("filter not found")
 	errInvalidBlockRange      = errors.New("invalid block range params")
+	errUnknownBlock           = errors.New("unknown block")
+	errBlockHashWithRange     = errors.New("can't specify fromBlock/toBlock with blockHash")
 	errPendingLogsUnsupported = errors.New("pending logs are not supported")
 	errExceedMaxTopics        = errors.New("exceed max topics")
 	errExceedMaxAddresses     = errors.New("exceed max addresses")
@@ -348,8 +350,13 @@ func (api *FilterAPI) GetLogs(ctx context.Context, crit FilterCriteria) ([]*type
 	if len(crit.Addresses) > maxAddresses {
 		return nil, errExceedMaxAddresses
 	}
+
 	var filter *Filter
 	if crit.BlockHash != nil {
+		if crit.FromBlock != nil || crit.ToBlock != nil {
+			return nil, errBlockHashWithRange
+		}
+
 		// Block filter requested, construct a single-shot filter
 		filter = api.sys.NewBlockFilter(*crit.BlockHash, crit.Addresses, crit.Topics)
 	} else {
@@ -372,6 +379,7 @@ func (api *FilterAPI) GetLogs(ctx context.Context, crit FilterCriteria) ([]*type
 		// Construct the range filter
 		filter = api.sys.NewRangeFilter(begin, end, crit.Addresses, crit.Topics)
 	}
+
 	// Run the filter and return all the logs
 	logs, err := filter.Logs(ctx)
 	if err != nil {

eth/filters/filter.go

@@ -85,7 +85,7 @@ func (f *Filter) Logs(ctx context.Context) ([]*types.Log, error) {
 			return nil, err
 		}
 		if header == nil {
-			return nil, errors.New("unknown block")
+			return nil, errUnknownBlock
 		}
 		if header.Number.Uint64() < f.sys.backend.HistoryPruningCutoff() {
 			return nil, &history.PrunedHistoryError{}

eth/filters/filter_system_test.go

@@ -450,24 +450,65 @@ func TestInvalidGetLogsRequest(t *testing.T) {
 	t.Parallel()
 
 	var (
-		db        = rawdb.NewMemoryDatabase()
-		_, sys    = newTestFilterSystem(db, Config{})
-		api       = NewFilterAPI(sys)
-		blockHash = common.HexToHash("0x1111111111111111111111111111111111111111111111111111111111111111")
+		genesis = &core.Genesis{
+			Config:  params.TestChainConfig,
+			BaseFee: big.NewInt(params.InitialBaseFee),
+		}
+		db, blocks, _    = core.GenerateChainWithGenesis(genesis, ethash.NewFaker(), 10, func(i int, gen *core.BlockGen) {})
+		_, sys           = newTestFilterSystem(db, Config{})
+		api              = NewFilterAPI(sys)
+		blockHash        = blocks[0].Hash()
+		unknownBlockHash = common.HexToHash("0x1111111111111111111111111111111111111111111111111111111111111111")
 	)
 
-	// Reason: Cannot specify both BlockHash and FromBlock/ToBlock)
-	testCases := []FilterCriteria{
-		0: {BlockHash: &blockHash, FromBlock: big.NewInt(100)},
-		1: {BlockHash: &blockHash, ToBlock: big.NewInt(500)},
-		2: {BlockHash: &blockHash, FromBlock: big.NewInt(rpc.LatestBlockNumber.Int64())},
-		3: {BlockHash: &blockHash, Topics: [][]common.Hash{{}, {}, {}, {}, {}}},
-		4: {BlockHash: &blockHash, Addresses: make([]common.Address, maxAddresses+1)},
+	// Insert the blocks into the chain so filter can look them up
+	blockchain, err := core.NewBlockChain(db, genesis, ethash.NewFaker(), nil)
+	if err != nil {
+		t.Fatalf("failed to create tester chain: %v", err)
+	}
+	if n, err := blockchain.InsertChain(blocks); err != nil {
+		t.Fatalf("block %d: failed to insert into chain: %v", n, err)
+	}
+
+	type testcase struct {
+		f   FilterCriteria
+		err error
+	}
+	testCases := []testcase{
+		{
+			f:   FilterCriteria{BlockHash: &blockHash, FromBlock: big.NewInt(100)},
+			err: errBlockHashWithRange,
+		},
+		{
+			f:   FilterCriteria{BlockHash: &blockHash, ToBlock: big.NewInt(500)},
+			err: errBlockHashWithRange,
+		},
+		{
+			f:   FilterCriteria{BlockHash: &blockHash, FromBlock: big.NewInt(rpc.LatestBlockNumber.Int64())},
+			err: errBlockHashWithRange,
+		},
+		{
+			f:   FilterCriteria{BlockHash: &unknownBlockHash},
+			err: errUnknownBlock,
+		},
+		{
+			f:   FilterCriteria{BlockHash: &blockHash, Topics: [][]common.Hash{{}, {}, {}, {}, {}}},
+			err: errExceedMaxTopics,
+		},
+		{
+			f:   FilterCriteria{BlockHash: &blockHash, Topics: [][]common.Hash{{}, {}, {}, {}, {}}},
+			err: errExceedMaxTopics,
+		},
+		{
+			f:   FilterCriteria{BlockHash: &blockHash, Addresses: make([]common.Address, maxAddresses+1)},
+			err: errExceedMaxAddresses,
+		},
 	}
 
 	for i, test := range testCases {
-		if _, err := api.GetLogs(context.Background(), test); err == nil {
-			t.Errorf("Expected Logs for case #%d to fail", i)
+		_, err := api.GetLogs(context.Background(), test.f)
+		if !errors.Is(err, test.err) {
+			t.Errorf("case %d: wrong error: %q\nwant: %q", i, err, test.err)
 		}
 	}
 }