[Feature] Enable logger overrides (#672)

Author: ajanikow

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
 - Add v2alpha1 API for ArangoDeployment and ArangoDeploymentReplication
 - Migrate CRD to apiextensions.k8s.io/v1
+- Add customizable log levels per service
 
 ## [1.1.2](https://github.com/arangodb/kube-arangodb/tree/1.1.2) (2020-11-11)
 - Fix Bootstrap phase and move it under Plan

main.go

@@ -92,7 +92,7 @@ var (
 		Run: cmdMainRun,
 	}
 
-	logLevel      string
+	logLevels     []string
 	cliLog        = logging.NewRootLogger()
 	logService    logging.Service
 	serverOptions struct {
@@ -131,7 +131,7 @@ func init() {
 	f.StringVar(&serverOptions.tlsSecretName, "server.tls-secret-name", "", "Name of secret containing tls.crt & tls.key for HTTPS server (if empty, self-signed certificate is used)")
 	f.StringVar(&serverOptions.adminSecretName, "server.admin-secret-name", defaultAdminSecretName, "Name of secret containing username + password for login to the dashboard")
 	f.BoolVar(&serverOptions.allowAnonymous, "server.allow-anonymous-access", false, "Allow anonymous access to the dashboard")
-	f.StringVar(&logLevel, "log.level", defaultLogLevel, "Set initial log level")
+	f.StringArrayVar(&logLevels, "log.level", []string{defaultLogLevel}, "Set log levels in format <level> or <logger>=<level>")
 	f.BoolVar(&operatorOptions.enableDeployment, "operator.deployment", false, "Enable to run the ArangoDeployment operator")
 	f.BoolVar(&operatorOptions.enableDeploymentReplication, "operator.deployment-replication", false, "Enable to run the ArangoDeploymentReplication operator")
 	f.BoolVar(&operatorOptions.enableStorage, "operator.storage", false, "Enable to run the ArangoLocalStorage operator")
@@ -170,7 +170,7 @@ func cmdMainRun(cmd *cobra.Command, args []string) {
 
 	// Prepare log service
 	var err error
-	logService, err = logging.NewService(logLevel)
+	logService, err = logging.NewService(defaultLogLevel, logLevels)
 	if err != nil {
 		cliLog.Fatal().Err(err).Msg("Failed to initialize log service")
 	}

pkg/logging/logger.go

@@ -29,16 +29,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/rs/zerolog"
-)
+	"github.com/pkg/errors"
 
-var (
-	// The defaultLevels list is used during development to increase the
-	// default level for components that we care a little less about.
-	defaultLevels = map[string]string{
-		//"operator": "info",
-		//"something.status": "info",
-	}
+	"github.com/rs/zerolog"
 )
 
 // Service exposes the interfaces for a logger service
@@ -70,7 +63,7 @@ func NewRootLogger() zerolog.Logger {
 }
 
 // NewService creates a new Service.
-func NewService(defaultLevel string) (Service, error) {
+func NewService(defaultLevel string, overrides []string) (Service, error) {
 	l, err := stringToLevel(defaultLevel)
 	if err != nil {
 		return nil, maskAny(err)
@@ -81,8 +74,25 @@ func NewService(defaultLevel string) (Service, error) {
 		defaultLevel: l,
 		levels:       make(map[string]zerolog.Level),
 	}
-	for k, v := range defaultLevels {
-		s.MustSetLevel(k, v)
+
+	for _, override := range overrides {
+		levelParts := strings.Split(override, "=")
+		switch size := len(levelParts); size {
+		case 1:
+			level, err := stringToLevel(levelParts[0])
+			if err != nil {
+				return nil, maskAny(err)
+			}
+			s.defaultLevel = level
+		case 2:
+			level, err := stringToLevel(levelParts[1])
+			if err != nil {
+				return nil, maskAny(err)
+			}
+			s.levels[levelParts[0]] = level
+		default:
+			return nil, errors.Errorf("invalid log definition %s: Length %d is not equal 1 or 2", override, size)
+		}
 	}
 	return s, nil
 }

storage.go

@@ -64,7 +64,7 @@ func init() {
 func cmdStorageProvisionerRun(cmd *cobra.Command, args []string) {
 	//goflag.CommandLine.Parse([]string{"-logtostderr"})
 	var err error
-	logService, err = logging.NewService(logLevel)
+	logService, err = logging.NewService(defaultLogLevel, logLevels)
 	if err != nil {
 		cliLog.Fatal().Err(err).Msg("Failed to initialize log service")
 	}