Add --log-format and --log-level flags to start cmd

cmd/start.go

@@ -5,9 +5,12 @@ import (
 
 	"github.com/logrusorgru/aurora"
 	"github.com/mesg-foundation/core/cmd/utils"
+	"github.com/mesg-foundation/core/config"
 	"github.com/mesg-foundation/core/container"
 	"github.com/mesg-foundation/core/daemon"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
 // Start the MESG Core.
@@ -18,7 +21,41 @@ var Start = &cobra.Command{
 	DisableAutoGenTag: true,
 }
 
+// logFormatValue reprenets log format flag value.
+type logFormatValue string
+
+func (v *logFormatValue) Set(value string) error {
+	if value != "text" && value != "json" {
+		return fmt.Errorf("%s is not valid log format", value)
+	}
+	viper.Set(config.LogFormat, value)
+	*v = logFormatValue(value)
+	return nil
+}
+func (v *logFormatValue) Type() string   { return "string" }
+func (v *logFormatValue) String() string { return string(*v) }
+
+// logLevelValue reprenets log level flag value.
+type logLevelValue string
+
+func (v *logLevelValue) Set(value string) error {
+	if _, err := logrus.ParseLevel(value); err != nil {
+		return fmt.Errorf("%s is not valid log level", value)
+	}
+	viper.Set(config.LogLevel, value)
+	*v = logLevelValue(value)
+	return nil
+}
+func (v *logLevelValue) Type() string   { return "string" }
+func (v *logLevelValue) String() string { return string(*v) }
+
 func init() {
+	lfv := logFormatValue("text")
+	Start.Flags().Var(&lfv, "log-format", "log format [text|json]")
+
+	llv := logLevelValue("info")
+	Start.Flags().Var(&llv, "log-level", "log level [debug|info|warn|error|fatal|panic]")
+
 	RootCmd.AddCommand(Start)
 }
 

daemon/start.go

@@ -31,6 +31,8 @@ func serviceSpec() (spec container.ServiceOptions, err error) {
 		Image:     viper.GetString(config.CoreImage),
 		Env: container.MapToEnv(map[string]string{
 			config.ToEnv(config.MESGPath):             "/mesg",
+			config.ToEnv(config.LogFormat):            viper.GetString(config.LogFormat),
+			config.ToEnv(config.LogLevel):             viper.GetString(config.LogLevel),
 			config.ToEnv(config.APIServiceSocketPath): filepath.Join(viper.GetString(config.MESGPath), "server.sock"),
 			config.ToEnv(config.ServicePathHost):      filepath.Join(viper.GetString(config.MESGPath), "services"),
 		}),