logger: Improve logger input argument handling and colorize outputs

config-logger-main.go

@@ -116,40 +116,52 @@ func mainConfigLogger(ctx *cli.Context) {
 
 func enableLog2Mongo(conf *config, args cli.Args) {
 	if conf.IsFileLoggingEnabled() {
-		fatalIf(probe.NewError(errInvalidArgument), "File logging already enabled. Please remove before enabling mongo.", nil)
+		Infoln("File logging already enabled. Removing automatically by enabling mongo.")
+		conf.FileLogger.Filename = ""
 	}
 	if conf.IsSysloggingEnabled() {
-		fatalIf(probe.NewError(errInvalidArgument), "Syslog logging already enabled. Please remove before enabling mongo.", nil)
+		Infoln("Syslog logging already enabled. Removing automatically by enabling mongo.")
+		conf.SyslogLogger.Addr = ""
+		conf.SyslogLogger.Network = ""
 	}
 	conf.MongoLogger.Addr = args.Get(0)
 	conf.MongoLogger.DB = args.Get(1)
 	conf.MongoLogger.Collection = args.Get(2)
 
 	err := saveConfig(conf.configV2)
-	fatalIf(err.Trace(), "Unable to save config.", nil)
+	fatalIf(err.Trace(), "Unable to save mongo logging config.", nil)
 }
 
 func enableLog2Syslog(conf *config, args cli.Args) {
 	if conf.IsFileLoggingEnabled() {
-		fatalIf(probe.NewError(errInvalidArgument), "File logging already enabled. Please remove before enabling syslog.", nil)
+		Infoln("File logging already enabled. Removing automatically by enabling syslog.")
+		conf.FileLogger.Filename = ""
 	}
 	if conf.IsMongoLoggingEnabled() {
-		fatalIf(probe.NewError(errInvalidArgument), "Mongo logging already enabled. Please remove before enabling syslog.", nil)
+		Infoln("Mongo logging already enabled. Removing automatically by enabling syslog.")
+		conf.MongoLogger.Addr = ""
+		conf.MongoLogger.DB = ""
+		conf.MongoLogger.Collection = ""
 	}
 	conf.SyslogLogger.Addr = args.Get(0)
 	conf.SyslogLogger.Network = args.Get(1)
 	err := saveConfig(conf.configV2)
-	fatalIf(err.Trace(), "Unable to save config.", nil)
+	fatalIf(err.Trace(), "Unable to save syslog config.", nil)
 }
 
 func enableLog2File(conf *config, args cli.Args) {
 	if conf.IsSysloggingEnabled() {
-		fatalIf(probe.NewError(errInvalidArgument), "Syslog logging already enabled. Please remove before enabling file.", nil)
+		Infoln("Syslog logging already enabled. Removing automatically by enabling file logging.")
+		conf.SyslogLogger.Addr = ""
+		conf.SyslogLogger.Network = ""
 	}
 	if conf.IsMongoLoggingEnabled() {
-		fatalIf(probe.NewError(errInvalidArgument), "Mongo logging already enabled. Please remove before enabling file.", nil)
+		Infoln("Mongo logging already enabled. Removing automatically by enabling file logging.")
+		conf.MongoLogger.Addr = ""
+		conf.MongoLogger.DB = ""
+		conf.MongoLogger.Collection = ""
 	}
 	conf.FileLogger.Filename = args.Get(0)
 	err := saveConfig(conf.configV2)
-	fatalIf(err.Trace(), "Unable to save config.", nil)
+	fatalIf(err.Trace(), "Unable to save file logging config.", nil)
 }

flags.go

@@ -28,19 +28,13 @@ var (
 		Usage: "ADDRESS:PORT for cloud storage access.",
 	}
 
-	loggerFlag = cli.StringFlag{
-		Name:  "logger",
-		Value: "none",
-		Usage: "Choose type of logging. Available options are [‘file’, ‘mongo’, ‘syslog’]",
-	}
-
 	accessLogFlag = cli.BoolFlag{
 		Name:  "enable-accesslog",
 		Hide:  true,
 		Usage: "Enable access logs for all incoming HTTP request.",
 	}
 
-	ratelimitFlag = cli.IntFlag{
+	rateLimitFlag = cli.IntFlag{
 		Name:  "ratelimit",
 		Hide:  true,
 		Value: 0,

logger-file-hook.go

@@ -1,3 +1,19 @@
+/*
+ * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package main
 
 import (

main.go

@@ -92,7 +92,7 @@ func registerApp() *cli.App {
 	// register all flags
 	registerFlag(addressFlag)
 	registerFlag(accessLogFlag)
-	registerFlag(ratelimitFlag)
+	registerFlag(rateLimitFlag)
 	registerFlag(anonymousFlag)
 	registerFlag(certFlag)
 	registerFlag(keyFlag)

server-config.go

@@ -24,6 +24,7 @@ import (
 	"os/user"
 	"path/filepath"
 
+	"github.com/fatih/color"
 	"github.com/minio/minio-xl/pkg/probe"
 	"github.com/minio/minio-xl/pkg/quick"
 )
@@ -78,9 +79,19 @@ func (c *configV2) IsMongoLoggingEnabled() bool {
 }
 
 func (c *configV2) String() string {
-	str := fmt.Sprintf("Mongo -> Addr: %s, DB: %s, Collection: %s\n", c.MongoLogger.Addr, c.MongoLogger.DB, c.MongoLogger.Collection)
-	str = str + fmt.Sprintf("Syslog -> Addr: %s, Network: %s\n", c.SyslogLogger.Addr, c.SyslogLogger.Network)
-	str = str + fmt.Sprintf("File -> Filename: %s", c.FileLogger.Filename)
+	white := color.New(color.FgWhite, color.Bold).SprintfFunc()
+	var str string
+	if c.IsMongoLoggingEnabled() {
+		str = fmt.Sprintf("Mongo -> %s", white("Addr: %s, DB: %s, Collection: %s",
+			c.MongoLogger.Addr, c.MongoLogger.DB, c.MongoLogger.Collection))
+	}
+	if c.IsSysloggingEnabled() {
+		str = fmt.Sprintf("Syslog -> %s", white("Addr: %s, Network: %s",
+			c.SyslogLogger.Addr, c.SyslogLogger.Network))
+	}
+	if c.IsFileLoggingEnabled() {
+		str = fmt.Sprintf("File -> %s", white("Filename: %s", c.FileLogger.Filename))
+	}
 	return str
 }