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/tlog.go

@@ -0,0 +1,79 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package mlog
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"sync"
+
+	"github.com/mattermost/logr/v2"
+	"github.com/mattermost/logr/v2/formatters"
+	"github.com/mattermost/logr/v2/targets"
+)
+
+// AddWriterTarget adds a simple io.Writer target to an existing Logger.
+// The `io.Writer` can be a buffer which is useful for testing.
+// When adding a buffer to collect logs make sure to use `mlog.Buffer` which is
+// a thread safe version of `bytes.Buffer`.
+func AddWriterTarget(logger *Logger, w io.Writer, useJSON bool, levels ...Level) error {
+	filter := logr.NewCustomFilter(levels...)
+
+	var formatter logr.Formatter
+	if useJSON {
+		formatter = &formatters.JSON{EnableCaller: true}
+	} else {
+		formatter = &formatters.Plain{EnableCaller: true}
+	}
+
+	target := targets.NewWriterTarget(w)
+	return logger.log.Logr().AddTarget(target, "_testWriter", filter, formatter, 1000)
+}
+
+// CreateConsoleTestLogger creates a logger for unit tests. Log records are output to `os.Stdout`.
+// Logs can also be mirrored to the optional `io.Writer`.
+func CreateConsoleTestLogger(useJSON bool, level Level) *Logger {
+	logger, _ := NewLogger()
+
+	filter := logr.StdFilter{
+		Lvl:        level,
+		Stacktrace: LvlPanic,
+	}
+
+	var formatter logr.Formatter
+	if useJSON {
+		formatter = &formatters.JSON{EnableCaller: true}
+	} else {
+		formatter = &formatters.Plain{EnableCaller: true}
+	}
+
+	target := targets.NewWriterTarget(os.Stdout)
+	if err := logger.log.Logr().AddTarget(target, "_testcon", filter, formatter, 1000); err != nil {
+		panic(err)
+	}
+	return logger
+}
+
+// Buffer provides a thread-safe buffer useful for logging to memory in unit tests.
+type Buffer struct {
+	buf bytes.Buffer
+	mux sync.Mutex
+}
+
+func (b *Buffer) Read(p []byte) (n int, err error) {
+	b.mux.Lock()
+	defer b.mux.Unlock()
+	return b.buf.Read(p)
+}
+func (b *Buffer) Write(p []byte) (n int, err error) {
+	b.mux.Lock()
+	defer b.mux.Unlock()
+	return b.buf.Write(p)
+}
+func (b *Buffer) String() string {
+	b.mux.Lock()
+	defer b.mux.Unlock()
+	return b.buf.String()
+}