Log validation and prevalidation times for blocks to files

internal/metrics/fullnode.go

@@ -316,6 +316,13 @@ func (s *FullNodeServiceMetrics) Block(resp *types.WebsocketResponse) {
 	s.preValidationTime.Set(block.PreValidationTime)
 	s.validationTime.Set(block.ValidationTime)
 
+	if err = utils.LogToFile("preValidationTime.log", fmt.Sprintf("%f", block.PreValidationTime)); err != nil {
+		log.Error(err.Error())
+	}
+	if err = utils.LogToFile("validationTime.log", fmt.Sprintf("%f", block.ValidationTime)); err != nil {
+		log.Error(err.Error())
+	}
+
 	if block.TransactionBlock {
 		s.blockCost.Set(float64(block.BlockCost.OrEmpty()))
 		s.blockFees.Set(float64(block.BlockFees.OrEmpty()))

internal/utils/log.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"os"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// LogToFile logs a message to a given file
+func LogToFile(filename, message string) error {
+	file, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+	defer func(file *os.File) {
+		err := file.Close()
+		if err != nil {
+			log.Errorf("Error closing file: %s\n", err.Error())
+		}
+	}(file)
+
+	if _, err := file.WriteString(message + "\n"); err != nil {
+		return err
+	}
+	return nil
+}