More app code migration (#5170)

* Migrate admin functions into app package

* More user function refactoring

* Move post functions into app package

app/admin.go

@@ -0,0 +1,182 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"bufio"
+	"os"
+	"strings"
+	"time"
+
+	"runtime/debug"
+
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/einterfaces"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/store"
+	"github.com/mattermost/platform/utils"
+)
+
+func GetLogs() ([]string, *model.AppError) {
+	var lines []string
+
+	if utils.Cfg.LogSettings.EnableFile {
+		file, err := os.Open(utils.GetLogFileLocation(utils.Cfg.LogSettings.FileLocation))
+		if err != nil {
+			return nil, model.NewLocAppError("getLogs", "api.admin.file_read_error", nil, err.Error())
+		}
+
+		defer file.Close()
+
+		scanner := bufio.NewScanner(file)
+		for scanner.Scan() {
+			lines = append(lines, scanner.Text())
+		}
+	} else {
+		lines = append(lines, "")
+	}
+
+	if einterfaces.GetClusterInterface() != nil {
+		clines, err := einterfaces.GetClusterInterface().GetLogs()
+		if err != nil {
+			return nil, err
+		}
+
+		lines = append(lines, clines...)
+	}
+
+	return lines, nil
+}
+
+func GetClusterStatus() []*model.ClusterInfo {
+	infos := make([]*model.ClusterInfo, 0)
+
+	if einterfaces.GetClusterInterface() != nil {
+		infos = einterfaces.GetClusterInterface().GetClusterInfos()
+	}
+
+	return infos
+}
+
+func InvalidateAllCaches() *model.AppError {
+	debug.FreeOSMemory()
+	InvalidateAllCachesSkipSend()
+
+	if einterfaces.GetClusterInterface() != nil {
+		err := einterfaces.GetClusterInterface().InvalidateAllCaches()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func InvalidateAllCachesSkipSend() {
+	l4g.Info(utils.T("api.context.invalidate_all_caches"))
+	sessionCache.Purge()
+	ClearStatusCache()
+	store.ClearChannelCaches()
+	store.ClearUserCaches()
+	store.ClearPostCaches()
+}
+
+func GetConfig() *model.Config {
+	json := utils.Cfg.ToJson()
+	cfg := model.ConfigFromJson(strings.NewReader(json))
+	cfg.Sanitize()
+
+	return cfg
+}
+
+func ReloadConfig() {
+	debug.FreeOSMemory()
+	utils.LoadConfig(utils.CfgFileName)
+
+	// start/restart email batching job if necessary
+	InitEmailBatching()
+}
+
+func SaveConfig(cfg *model.Config) *model.AppError {
+	cfg.SetDefaults()
+	utils.Desanitize(cfg)
+
+	if err := cfg.IsValid(); err != nil {
+		return err
+	}
+
+	if err := utils.ValidateLdapFilter(cfg); err != nil {
+		return err
+	}
+
+	if *utils.Cfg.ClusterSettings.Enable {
+		return model.NewLocAppError("saveConfig", "ent.cluster.save_config.error", nil, "")
+	}
+
+	//oldCfg := utils.Cfg
+	utils.SaveConfig(utils.CfgFileName, cfg)
+	utils.LoadConfig(utils.CfgFileName)
+
+	if einterfaces.GetMetricsInterface() != nil {
+		if *utils.Cfg.MetricsSettings.Enable {
+			einterfaces.GetMetricsInterface().StartServer()
+		} else {
+			einterfaces.GetMetricsInterface().StopServer()
+		}
+	}
+
+	// Future feature is to sync the configuration files
+	// if einterfaces.GetClusterInterface() != nil {
+	// 	err := einterfaces.GetClusterInterface().ConfigChanged(cfg, oldCfg, true)
+	// 	if err != nil {
+	// 		return err
+	// 	}
+	// }
+
+	// start/restart email batching job if necessary
+	InitEmailBatching()
+
+	return nil
+}
+
+func RecycleDatabaseConnection() {
+	oldStore := Srv.Store
+
+	l4g.Warn(utils.T("api.admin.recycle_db_start.warn"))
+	Srv.Store = store.NewSqlStore()
+
+	time.Sleep(20 * time.Second)
+	oldStore.Close()
+
+	l4g.Warn(utils.T("api.admin.recycle_db_end.warn"))
+}
+
+func TestEmail(userId string, cfg *model.Config) *model.AppError {
+	if len(cfg.EmailSettings.SMTPServer) == 0 {
+		return model.NewLocAppError("testEmail", "api.admin.test_email.missing_server", nil, utils.T("api.context.invalid_param.app_error", map[string]interface{}{"Name": "SMTPServer"}))
+	}
+
+	// if the user hasn't changed their email settings, fill in the actual SMTP password so that
+	// the user can verify an existing SMTP connection
+	if cfg.EmailSettings.SMTPPassword == model.FAKE_SETTING {
+		if cfg.EmailSettings.SMTPServer == utils.Cfg.EmailSettings.SMTPServer &&
+			cfg.EmailSettings.SMTPPort == utils.Cfg.EmailSettings.SMTPPort &&
+			cfg.EmailSettings.SMTPUsername == utils.Cfg.EmailSettings.SMTPUsername {
+			cfg.EmailSettings.SMTPPassword = utils.Cfg.EmailSettings.SMTPPassword
+		} else {
+			return model.NewLocAppError("testEmail", "api.admin.test_email.reenter_password", nil, "")
+		}
+	}
+
+	if user, err := GetUser(userId); err != nil {
+		return err
+	} else {
+		T := utils.GetUserTranslations(user.Locale)
+		if err := utils.SendMailUsingConfig(user.Email, T("api.admin.test_email.subject"), T("api.admin.test_email.body"), cfg); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}