Fixes intelsdi-x#1438, set log level for logs from grpc to user defined

set Out and Formatter for grpc logs

snapteld.go

@@ -47,6 +47,7 @@ import (
 	"github.com/intelsdi-x/snap/mgmt/tribe/agreement"
 	"github.com/intelsdi-x/snap/pkg/cfgfile"
 	"github.com/intelsdi-x/snap/scheduler"
+	"google.golang.org/grpc/grpclog"
 )
 
 var (
@@ -246,6 +247,9 @@ func action(ctx *cli.Context) error {
 		log.Fatal("Errors found after applying command-line flags")
 	}
 
+	//create a new logger to prepare configuration for grpc logger
+	grpcLogger := log.New()
+
 	// If logPath is set, we verify the logPath and set it so that all logging
 	// goes to the log file instead of stdout.
 	logPath := cfg.LogPath
@@ -267,6 +271,7 @@ func action(ctx *cli.Context) error {
 		}
 		defer file.Close()
 		log.SetOutput(file)
+		grpcLogger.Out = file
 	}
 	// Because even though github.com/Sirupsen/logrus states that
 	// 'Logs the event in colors if stdout is a tty, otherwise without colors'
@@ -278,15 +283,24 @@ func action(ctx *cli.Context) error {
 	// redirect mechanisms like # snapteld -t 0 -l 1 2>&1 | tee my.log
 	if !cfg.LogColors {
 		log.SetFormatter(&log.TextFormatter{FullTimestamp: true, DisableColors: true})
+		grpcLogger.Formatter = &log.TextFormatter{FullTimestamp: true, DisableColors: true}
 	} else {
 		log.SetFormatter(&log.TextFormatter{FullTimestamp: true})
+		grpcLogger.Formatter = &log.TextFormatter{FullTimestamp: true}
 	}
 
 	// Validate log level and trust level settings for snapteld
 	validateLevelSettings(cfg.LogLevel, cfg.Control.PluginTrust)
 
 	// Switch log level to user defined
 	log.SetLevel(getLevel(cfg.LogLevel))
+
+	// Set log level for logs from grpc to user defined
+	grpcLogger.Level = getLevel(cfg.LogLevel)
+
+	//Set configuration for grpc logger
+	grpclog.SetLogger(grpcLogger)
+
 	log.Info("setting log level to: ", l[cfg.LogLevel])
 
 	log.Info("Starting snapteld (version: ", gitversion, ")")