Use mattermost v5 module (#1192)

vendor/github.com/mattermost/mattermost-server/v5/mlog/global.go

@@ -0,0 +1,44 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package mlog
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+var globalLogger *Logger
+
+func InitGlobalLogger(logger *Logger) {
+	glob := *logger
+	glob.zap = glob.zap.WithOptions(zap.AddCallerSkip(1))
+	globalLogger = &glob
+	Debug = globalLogger.Debug
+	Info = globalLogger.Info
+	Warn = globalLogger.Warn
+	Error = globalLogger.Error
+	Critical = globalLogger.Critical
+}
+
+func RedirectStdLog(logger *Logger) {
+	zap.RedirectStdLogAt(logger.zap.With(zap.String("source", "stdlog")).WithOptions(zap.AddCallerSkip(-2)), zapcore.ErrorLevel)
+}
+
+type LogFunc func(string, ...Field)
+
+// DON'T USE THIS Modify the level on the app logger
+func GloballyDisableDebugLogForTest() {
+	globalLogger.consoleLevel.SetLevel(zapcore.ErrorLevel)
+}
+
+// DON'T USE THIS Modify the level on the app logger
+func GloballyEnableDebugLogForTest() {
+	globalLogger.consoleLevel.SetLevel(zapcore.DebugLevel)
+}
+
+var Debug LogFunc = defaultDebugLog
+var Info LogFunc = defaultInfoLog
+var Warn LogFunc = defaultWarnLog
+var Error LogFunc = defaultErrorLog
+var Critical LogFunc = defaultCriticalLog