PLT-4938 Add app package and move logic over from api package (#4931)

* Add app package and move logic over from api package

* Change app package functions to return errors

* Move non-api tests into app package

* Fix merge

app/session.go

@@ -0,0 +1,94 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/platform/einterfaces"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/store"
+	"github.com/mattermost/platform/utils"
+
+	l4g "github.com/alecthomas/log4go"
+)
+
+var sessionCache *utils.Cache = utils.NewLru(model.SESSION_CACHE_SIZE)
+
+func GetSession(token string) (*model.Session, *model.AppError) {
+	metrics := einterfaces.GetMetricsInterface()
+
+	var session *model.Session
+	if ts, ok := sessionCache.Get(token); ok {
+		session = ts.(*model.Session)
+		if metrics != nil {
+			metrics.IncrementMemCacheHitCounter("Session")
+		}
+	} else {
+		if metrics != nil {
+			metrics.IncrementMemCacheMissCounter("Session")
+		}
+	}
+
+	if session == nil {
+		if sessionResult := <-Srv.Store.Session().Get(token); sessionResult.Err != nil {
+			return nil, model.NewLocAppError("GetSession", "api.context.invalid_token.error", map[string]interface{}{"Token": token, "Error": sessionResult.Err.DetailedError}, "")
+		} else {
+			session = sessionResult.Data.(*model.Session)
+
+			if session.IsExpired() || session.Token != token {
+				return nil, model.NewLocAppError("GetSession", "api.context.invalid_token.error", map[string]interface{}{"Token": token, "Error": sessionResult.Err.DetailedError}, "")
+			} else {
+				AddSessionToCache(session)
+				return session, nil
+			}
+		}
+	}
+
+	if session == nil || session.IsExpired() {
+		return nil, model.NewLocAppError("GetSession", "api.context.invalid_token.error", map[string]interface{}{"Token": token}, "")
+	}
+
+	return session, nil
+}
+
+func RemoveAllSessionsForUserId(userId string) {
+
+	RemoveAllSessionsForUserIdSkipClusterSend(userId)
+
+	if einterfaces.GetClusterInterface() != nil {
+		einterfaces.GetClusterInterface().RemoveAllSessionsForUserId(userId)
+	}
+}
+
+func RemoveAllSessionsForUserIdSkipClusterSend(userId string) {
+	keys := sessionCache.Keys()
+
+	for _, key := range keys {
+		if ts, ok := sessionCache.Get(key); ok {
+			session := ts.(*model.Session)
+			if session.UserId == userId {
+				sessionCache.Remove(key)
+			}
+		}
+	}
+
+	InvalidateWebConnSessionCacheForUser(userId)
+
+}
+
+func AddSessionToCache(session *model.Session) {
+	sessionCache.AddWithExpiresInSecs(session.Token, session, int64(*utils.Cfg.ServiceSettings.SessionCacheInMinutes*60))
+}
+
+func InvalidateAllCaches() {
+	l4g.Info(utils.T("api.context.invalidate_all_caches"))
+	sessionCache.Purge()
+	ClearStatusCache()
+	store.ClearChannelCaches()
+	store.ClearUserCaches()
+	store.ClearPostCaches()
+}
+
+func SessionCacheLength() int {
+	return sessionCache.Len()
+}