Streamline Logging to be more useful for using the proto-kms

This aims at addressing issue #3 (closed)

Problem Description

Right now logging is happening in quite an unstructured way across multiple places, e.g.,

• not log-levels are being used
• the originating code part is not visible, except it is manually added to the log-message

Applied Changes

• move from go's log pkg to sirupsen/logrus
• add log-levels
• loglevel to be handed over during start of the pkg separately for the quantlum-layer and the proto-kms (using logrus instances)
• log.SetOutput(os.Stdout) to be set during boot, if log messages should not go to stdout
• log.SetFormatter() to be added
• use of log.SetReportCaller(true) to add origin code of the message to log-message in Trace level

quantumlayer/quantumlayer-emu-prng.go

@@ -20,7 +20,8 @@ import (
 	"sync"
 	"time"
 
-	log "github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus"
+	logi "github.com/sirupsen/logrus"
 )
 
 type QuantumPayloadElement struct {
@@ -44,22 +45,26 @@ type QuantumlayerEmuPRNG struct {
 	qlPeerMutex      sync.Mutex
 }
 
-func NewQuantumlayerEmuPRNG(logOutput io.Writer, logLevel log.Level, logInJson bool) (newql *QuantumlayerEmuPRNG) {
+// We use our own logrus instance, as we would like to have different log levels for different parts.
+var log = logrus.New()
+
+func NewQuantumlayerEmuPRNG(logOutput io.Writer, logLevel logi.Level, logInJson bool) (newql *QuantumlayerEmuPRNG) {
 	/*
 	 * Setup logging
 	 */
+
 	//What level
 	log.SetLevel(logLevel)
 	// Where to send log out put
 	log.SetOutput(logOutput)
 	// and plain-text (standard) or json
 	if !logInJson {
-		log.SetFormatter(&log.TextFormatter{})
+		log.SetFormatter(&logi.TextFormatter{})
 	} else {
-		log.SetFormatter(&log.JSONFormatter{})
+		log.SetFormatter(&logi.JSONFormatter{})
 	}
 	// print code function if level is set to Trace
-	if logLevel == log.TraceLevel {
+	if logLevel == logi.TraceLevel {
 		log.SetReportCaller(true)
 	} else {
 		log.SetReportCaller(false)