PLT-5308 Caching layer part 2 (#6973)

* Adding Reaction store cache layer example

* Implementing reaction store in new caching system.

* Redis for reaction store

* Adding redis library

* Adding invalidation for DeleteAllWithEmojiName and other minor enhancements

store/sql_supplier.go

@@ -57,11 +57,6 @@ const (
 	EXIT_REMOVE_TABLE                = 134
 )
 
-type SqlSupplierResult struct {
-	Err    model.AppError
-	Result interface{}
-}
-
 type SqlSupplierOldStores struct {
 	team       TeamStore
 	channel    ChannelStore
@@ -86,6 +81,7 @@ type SqlSupplierOldStores struct {
 }
 
 type SqlSupplier struct {
+	next           LayeredStoreSupplier
 	master         *gorp.DbMap
 	replicas       []*gorp.DbMap
 	searchReplicas []*gorp.DbMap
@@ -120,9 +116,10 @@ func NewSqlSupplier() *SqlSupplier {
 	supplier.oldStores.emoji = NewSqlEmojiStore(supplier)
 	supplier.oldStores.status = NewSqlStatusStore(supplier)
 	supplier.oldStores.fileInfo = NewSqlFileInfoStore(supplier)
-	supplier.oldStores.reaction = NewSqlReactionStore(supplier)
 	supplier.oldStores.job = NewSqlJobStore(supplier)
 
+	initSqlSupplierReactions(supplier)
+
 	err := supplier.GetMaster().CreateTablesIfNotExists()
 	if err != nil {
 		l4g.Critical(utils.T("store.sql.creating_tables.critical"), err)
@@ -149,7 +146,6 @@ func NewSqlSupplier() *SqlSupplier {
 	supplier.oldStores.emoji.(*SqlEmojiStore).CreateIndexesIfNotExists()
 	supplier.oldStores.status.(*SqlStatusStore).CreateIndexesIfNotExists()
 	supplier.oldStores.fileInfo.(*SqlFileInfoStore).CreateIndexesIfNotExists()
-	supplier.oldStores.reaction.(*SqlReactionStore).CreateIndexesIfNotExists()
 	supplier.oldStores.job.(*SqlJobStore).CreateIndexesIfNotExists()
 
 	supplier.oldStores.preference.(*SqlPreferenceStore).DeleteUnusedFeatures()
@@ -157,6 +153,14 @@ func NewSqlSupplier() *SqlSupplier {
 	return supplier
 }
 
+func (s *SqlSupplier) SetChainNext(next LayeredStoreSupplier) {
+	s.next = next
+}
+
+func (s *SqlSupplier) Next() LayeredStoreSupplier {
+	return s.next
+}
+
 func setupConnection(con_type string, driver string, dataSource string, maxIdle int, maxOpen int, trace bool) *gorp.DbMap {
 	db, err := dbsql.Open(driver, dataSource)
 	if err != nil {