MM-25115- migrate post, session and status cache to cache2 (#14667)

* use cache2.Provider cache

* use cache2.Provider cache

* clean up imports

* reset test runner

* add close() call

* Fixing i18n

* address review comments

Co-authored-by: Jesús Espino <jespinog@gmail.com>
Co-authored-by: mattermod <mattermod@users.noreply.github.com>

app/session.go

@@ -6,6 +6,7 @@ package app
 import (
 	"math"
 	"net/http"
+	"time"
 
 	"github.com/mattermost/mattermost-server/v5/audit"
 	"github.com/mattermost/mattermost-server/v5/mlog"
@@ -30,8 +31,7 @@ func (a *App) GetSession(token string) (*model.Session, *model.AppError) {
 
 	var session *model.Session
 	var err *model.AppError
-	if ts, ok := a.Srv().sessionCache.Get(token); ok {
-		session = ts.(*model.Session)
+	if err := a.Srv().sessionCache.Get(token, &session); err == nil {
 		if metrics != nil {
 			metrics.IncrementMemCacheHitCounterSession()
 		}
@@ -178,15 +178,15 @@ func (a *App) ClearSessionCacheForAllUsers() {
 }
 
 func (a *App) ClearSessionCacheForUserSkipClusterSend(userId string) {
-	keys := a.Srv().sessionCache.Keys()
-
-	for _, key := range keys {
-		if ts, ok := a.Srv().sessionCache.Get(key); ok {
-			session := ts.(*model.Session)
-			if session.UserId == userId {
-				a.Srv().sessionCache.Remove(key)
-				if a.Metrics() != nil {
-					a.Metrics().IncrementMemCacheInvalidationCounterSession()
+	if keys, err := a.Srv().sessionCache.Keys(); err == nil {
+		var session *model.Session
+		for _, key := range keys {
+			if err := a.Srv().sessionCache.Get(key, &session); err == nil {
+				if session.UserId == userId {
+					a.Srv().sessionCache.Remove(key)
+					if a.Metrics() != nil {
+						a.Metrics().IncrementMemCacheInvalidationCounterSession()
+					}
 				}
 			}
 		}
@@ -201,11 +201,14 @@ func (a *App) ClearSessionCacheForAllUsersSkipClusterSend() {
 }
 
 func (a *App) AddSessionToCache(session *model.Session) {
-	a.Srv().sessionCache.AddWithExpiresInSecs(session.Token, session, int64(*a.Config().ServiceSettings.SessionCacheInMinutes*60))
+	a.Srv().sessionCache.SetWithExpiry(session.Token, session, time.Duration(int64(*a.Config().ServiceSettings.SessionCacheInMinutes))*time.Minute)
 }
 
 func (a *App) SessionCacheLength() int {
-	return a.Srv().sessionCache.Len()
+	if l, err := a.Srv().sessionCache.Len(); err == nil {
+		return l
+	}
+	return 0
 }
 
 func (a *App) RevokeSessionsForDeviceId(userId string, deviceId string, currentSessionId string) *model.AppError {