Structured logging (#8673)

* Implementing structured logging

* Changes to en.json to allow refactor to run.

* Fixing global logger

* Structured logger initalization.

* Add caller.

* Do some log redirection.

* Auto refactor

* Cleaning up l4g reference and removing dependancy.

* Removing junk.

* Copyright headers.

* Fixing tests

* Revert "Changes to en.json to allow refactor to run."

This reverts commit fd8249e99bcad0231e6ea65cd77c32aae9a54026.

* Fixing some auto refactor strangeness and typo.

* Making keys more human readable.

mlog/global.go

@@ -0,0 +1,42 @@
+// 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) {
+	globalLogger = logger
+	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")), 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
+var Info LogFunc
+var Warn LogFunc
+var Error LogFunc
+var Critical LogFunc