eth/filters: getLogs fast exit if from>to

Signed-off-by: jsvisa <delweng@gmail.com>

eth/filters/api.go

@@ -347,6 +347,10 @@ func (api *FilterAPI) GetLogs(ctx context.Context, crit FilterCriteria) ([]*type
 		if crit.ToBlock != nil {
 			end = crit.ToBlock.Int64()
 		}
+		// Fast exit if from > to
+		if begin > 0 && end > 0 && begin > end {
+			return nil, nil
+		}
 		// Construct the range filter
 		filter = api.sys.NewRangeFilter(begin, end, crit.Addresses, crit.Topics)
 	}

eth/filters/filter_system_test.go

@@ -429,7 +429,10 @@ func TestInvalidLogFilterCreation(t *testing.T) {
 	}
 }
 
+// TestLogFilterUninstall tests invalid getLogs requests
 func TestInvalidGetLogsRequest(t *testing.T) {
+	t.Parallel()
+
 	var (
 		db        = rawdb.NewMemoryDatabase()
 		_, sys    = newTestFilterSystem(t, db, Config{})
@@ -451,6 +454,21 @@ func TestInvalidGetLogsRequest(t *testing.T) {
 	}
 }
 
+// TestInvalidGetRangeLogsRequest tests getLogs with invalid block range
+func TestInvalidGetRangeLogsRequest(t *testing.T) {
+	t.Parallel()
+
+	var (
+		db     = rawdb.NewMemoryDatabase()
+		_, sys = newTestFilterSystem(t, db, Config{})
+		api    = NewFilterAPI(sys, false)
+	)
+
+	if _, err := api.GetLogs(context.Background(), FilterCriteria{FromBlock: big.NewInt(2), ToBlock: big.NewInt(1)}); err != nil {
+		t.Errorf("Expected Logs for invalid range succeed, but got: %v", err)
+	}
+}
+
 // TestLogFilter tests whether log filters match the correct logs that are posted to the event feed.
 func TestLogFilter(t *testing.T) {
 	t.Parallel()