Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/public/shared/mlog/global.go

@@ -0,0 +1,129 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package mlog
+
+import (
+	"sync"
+)
+
+var (
+	globalLogger    *Logger
+	muxGlobalLogger sync.RWMutex
+)
+
+func InitGlobalLogger(logger *Logger) {
+	muxGlobalLogger.Lock()
+	defer muxGlobalLogger.Unlock()
+
+	globalLogger = logger
+}
+
+func getGlobalLogger() *Logger {
+	muxGlobalLogger.RLock()
+	defer muxGlobalLogger.RUnlock()
+
+	return globalLogger
+}
+
+// IsLevelEnabled returns true only if at least one log target is
+// configured to emit the specified log level. Use this check when
+// gathering the log info may be expensive.
+//
+// Note, transformations and serializations done via fields are already
+// lazily evaluated and don't require this check beforehand.
+func IsLevelEnabled(level Level) bool {
+	logger := getGlobalLogger()
+	if logger == nil {
+		return defaultIsLevelEnabled(level)
+	}
+	return logger.IsLevelEnabled(level)
+}
+
+// Log emits the log record for any targets configured for the specified level.
+func Log(level Level, msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(level, msg, fields...)
+		return
+	}
+	logger.Log(level, msg, fields...)
+}
+
+// LogM emits the log record for any targets configured for the specified levels.
+// Equivalent to calling `Log` once for each level.
+func LogM(levels []Level, msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultCustomMultiLog(levels, msg, fields...)
+		return
+	}
+	logger.LogM(levels, msg, fields...)
+}
+
+// Convenience method equivalent to calling `Log` with the `Trace` level.
+func Trace(msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(LvlTrace, msg, fields...)
+		return
+	}
+	logger.Trace(msg, fields...)
+}
+
+// Convenience method equivalent to calling `Log` with the `Debug` level.
+func Debug(msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(LvlDebug, msg, fields...)
+		return
+	}
+	logger.Debug(msg, fields...)
+}
+
+// Convenience method equivalent to calling `Log` with the `Info` level.
+func Info(msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(LvlInfo, msg, fields...)
+		return
+	}
+	logger.Info(msg, fields...)
+}
+
+// Convenience method equivalent to calling `Log` with the `Warn` level.
+func Warn(msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(LvlWarn, msg, fields...)
+		return
+	}
+	logger.Warn(msg, fields...)
+}
+
+// Convenience method equivalent to calling `Log` with the `Error` level.
+func Error(msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(LvlError, msg, fields...)
+		return
+	}
+	logger.Error(msg, fields...)
+}
+
+// Convenience method equivalent to calling `Log` with the `Critical` level.
+// DEPRECATED: Either use Error or Fatal.
+// Critical level isn't added in mlog/levels.go:StdAll so calling this doesn't
+// really work. For now we just call Fatal to atleast print something.
+func Critical(msg string, fields ...Field) {
+	Fatal(msg, fields...)
+}
+
+func Fatal(msg string, fields ...Field) {
+	logger := getGlobalLogger()
+	if logger == nil {
+		defaultLog(LvlFatal, msg, fields...)
+		return
+	}
+	logger.Fatal(msg, fields...)
+}