Cached block number in logger

core/constants.go

@@ -23,3 +23,6 @@ var DefaultWaitTime = 1
 var DefaultGasLimit = 2
 var DefaultRPCTimeout = 10
 var DefaultLogLevel = ""
+
+//BlockNumberInterval is the interval in seconds after which blockNumber needs to be calculated again
+var BlockNumberInterval = 5

logger/logger.go

@@ -15,6 +15,7 @@ import (
 	"razor/core"
 	"razor/path"
 	"runtime"
+	"time"
 )
 
 type StandardLogger struct {
@@ -28,6 +29,7 @@ var Epoch uint32
 var BlockNumber *big.Int
 var FileName string
 var Client *ethclient.Client
+var lastBlockNumberTimestamp time.Time
 
 func init() {
 	path.PathUtilsInterface = &path.PathUtils{}
@@ -168,16 +170,20 @@ func (logger *StandardLogger) Fatalf(format string, args ...interface{}) {
 }
 
 func SetEpochAndBlockNumber(client *ethclient.Client) {
-	if client != nil {
-		latestHeader, err := client.HeaderByNumber(context.Background(), nil)
-		if err != nil {
-			log.Error("Error in fetching block: ", err)
-			return
+	elapsedTime := time.Since(lastBlockNumberTimestamp).Seconds()
+	if elapsedTime > float64(core.BlockNumberInterval) {
+		if client != nil {
+			latestHeader, err := client.HeaderByNumber(context.Background(), nil)
+			if err != nil {
+				log.Error("Error in fetching block: ", err)
+				return
+			}
+			BlockNumber = latestHeader.Number
+
+			epoch := latestHeader.Time / uint64(core.EpochLength)
+			Epoch = uint32(epoch)
+			lastBlockNumberTimestamp = time.Now()
 		}
-		BlockNumber = latestHeader.Number
-
-		epoch := latestHeader.Time / uint64(core.EpochLength)
-		Epoch = uint32(epoch)
 	}
 }