Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/config/logconfigsrc.go

@@ -0,0 +1,165 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+type LogSrcListener func(old, new mlog.LoggerConfiguration)
+
+// LogConfigSrc abstracts the Advanced Logging configuration so that implementations can
+// fetch from file, database, etc.
+type LogConfigSrc interface {
+	// Get fetches the current, cached configuration.
+	Get() mlog.LoggerConfiguration
+
+	// Set updates the dsn specifying the source and reloads
+	Set(dsn string, configStore *Store) (err error)
+
+	// Close cleans up resources.
+	Close() error
+}
+
+// NewLogConfigSrc creates an advanced logging configuration source, backed by a
+// file, JSON string, or database.
+func NewLogConfigSrc(dsn string, configStore *Store) (LogConfigSrc, error) {
+	if dsn == "" {
+		return nil, errors.New("dsn should not be empty")
+	}
+
+	if configStore == nil {
+		return nil, errors.New("configStore should not be nil")
+	}
+
+	dsn = strings.TrimSpace(dsn)
+
+	if isJSONMap(dsn) {
+		return newJSONSrc(dsn)
+	}
+
+	path := dsn
+	// If this is a file based config we need the full path so it can be watched.
+	if strings.HasPrefix(configStore.String(), "file://") && !filepath.IsAbs(dsn) {
+		configPath := strings.TrimPrefix(configStore.String(), "file://")
+		path = filepath.Join(filepath.Dir(configPath), dsn)
+	}
+
+	return newFileSrc(path, configStore)
+}
+
+// jsonSrc
+
+type jsonSrc struct {
+	logSrcEmitter
+	mutex sync.RWMutex
+	cfg   mlog.LoggerConfiguration
+}
+
+func newJSONSrc(data string) (*jsonSrc, error) {
+	src := &jsonSrc{}
+	return src, src.Set(data, nil)
+}
+
+// Get fetches the current, cached configuration
+func (src *jsonSrc) Get() mlog.LoggerConfiguration {
+	src.mutex.RLock()
+	defer src.mutex.RUnlock()
+	return src.cfg
+}
+
+// Set updates the JSON specifying the source and reloads
+func (src *jsonSrc) Set(data string, _ *Store) error {
+	cfg, err := logTargetCfgFromJSON([]byte(data))
+	if err != nil {
+		return err
+	}
+
+	src.set(cfg)
+	return nil
+}
+
+func (src *jsonSrc) set(cfg mlog.LoggerConfiguration) {
+	src.mutex.Lock()
+	defer src.mutex.Unlock()
+
+	old := src.cfg
+	src.cfg = cfg
+	src.invokeConfigListeners(old, cfg)
+}
+
+// Close cleans up resources.
+func (src *jsonSrc) Close() error {
+	return nil
+}
+
+// fileSrc
+
+type fileSrc struct {
+	mutex sync.RWMutex
+	cfg   mlog.LoggerConfiguration
+	path  string
+}
+
+func newFileSrc(path string, configStore *Store) (*fileSrc, error) {
+	src := &fileSrc{
+		path: path,
+	}
+	if err := src.Set(path, configStore); err != nil {
+		return nil, err
+	}
+	return src, nil
+}
+
+// Get fetches the current, cached configuration
+func (src *fileSrc) Get() mlog.LoggerConfiguration {
+	src.mutex.RLock()
+	defer src.mutex.RUnlock()
+	return src.cfg
+}
+
+// Set updates the dsn specifying the file source and reloads.
+// The file will be watched for changes and reloaded as needed,
+// and all listeners notified.
+func (src *fileSrc) Set(path string, configStore *Store) error {
+	data, err := configStore.GetFile(path)
+	if err != nil {
+		return err
+	}
+
+	cfg, err := logTargetCfgFromJSON(data)
+	if err != nil {
+		return err
+	}
+
+	src.set(cfg)
+	return nil
+}
+
+func (src *fileSrc) set(cfg mlog.LoggerConfiguration) {
+	src.mutex.Lock()
+	defer src.mutex.Unlock()
+
+	src.cfg = cfg
+}
+
+// Close cleans up resources.
+func (src *fileSrc) Close() error {
+	return nil
+}
+
+func logTargetCfgFromJSON(data []byte) (mlog.LoggerConfiguration, error) {
+	cfg := make(mlog.LoggerConfiguration)
+	err := json.Unmarshal(data, &cfg)
+	if err != nil {
+		return nil, err
+	}
+	return cfg, nil
+}