MM-8796: Full implementation of "Schemes" in Store/Model/App layers. (#8357)

* Add Scheme model and stub store.

* Port ChannelStore to be Scheme aware.

* Make almost all the API/APP layer work with ChannelSchemes.

Only thing still hacky is UpdateChannelMemberRoles().

* Add basic SchemeStore implementation.

* Migrate UpdateChannelMemberRoles properly and fix tests.

* Update store tests and mocks so they work.

* Include creating default roles in Scheme create store function.

* Implement role deletion and start scheme deletion.

* Only use non-deleted roles for authorization.

* Add GetByScheme method to Team store.

* Add GetChannelsByScheme.

* Update store mocks.

* Implement scheme deletion in the store.

* Rename is valid function.

* Add offset and limit to queries to fetch teams and channels by scheme.

* Fix queries.

* Implement scheme awareness in Team store and add a migration.

* Tidy up ChannelStore mapping functions and add exhaustive unit tests.

* Add all missing i18n.

* Proper tests for TeamStore internal functions and fix them.

* Make additional TeamMember fields nullable.

* Make new ChannelMember fields nullable.

* Create new nullable columns without defaults.

* Make new fields in large tables nullalble.

* Fix empty list of TeamMembers.

* Deduplicate SQL queries.

* Fix spelling.

* Fix review comment.

* More review fixes.

* More review fixes.

store/layered_store.go

@@ -24,6 +24,7 @@ type LayeredStore struct {
 	TmpContext      context.Context
 	ReactionStore   ReactionStore
 	RoleStore       RoleStore
+	SchemeStore     SchemeStore
 	DatabaseLayer   LayeredStoreDatabaseLayer
 	LocalCacheLayer *LocalCacheSupplier
 	RedisLayer      *RedisSupplier
@@ -39,6 +40,7 @@ func NewLayeredStore(db LayeredStoreDatabaseLayer, metrics einterfaces.MetricsIn
 
 	store.ReactionStore = &LayeredReactionStore{store}
 	store.RoleStore = &LayeredRoleStore{store}
+	store.SchemeStore = &LayeredSchemeStore{store}
 
 	// Setup the chain
 	if ENABLE_EXPERIMENTAL_REDIS {
@@ -167,6 +169,10 @@ func (s *LayeredStore) Role() RoleStore {
 	return s.RoleStore
 }
 
+func (s *LayeredStore) Scheme() SchemeStore {
+	return s.SchemeStore
+}
+
 func (s *LayeredStore) MarkSystemRanUnitTests() {
 	s.DatabaseLayer.MarkSystemRanUnitTests()
 }
@@ -253,8 +259,36 @@ func (s *LayeredRoleStore) GetByNames(names []string) StoreChannel {
 	})
 }
 
+func (s *LayeredRoleStore) Delete(roldId string) StoreChannel {
+	return s.RunQuery(func(supplier LayeredStoreSupplier) *LayeredStoreSupplierResult {
+		return supplier.RoleDelete(s.TmpContext, roldId)
+	})
+}
+
 func (s *LayeredRoleStore) PermanentDeleteAll() StoreChannel {
 	return s.RunQuery(func(supplier LayeredStoreSupplier) *LayeredStoreSupplierResult {
 		return supplier.RolePermanentDeleteAll(s.TmpContext)
 	})
 }
+
+type LayeredSchemeStore struct {
+	*LayeredStore
+}
+
+func (s *LayeredSchemeStore) Save(scheme *model.Scheme) StoreChannel {
+	return s.RunQuery(func(supplier LayeredStoreSupplier) *LayeredStoreSupplierResult {
+		return supplier.SchemeSave(s.TmpContext, scheme)
+	})
+}
+
+func (s *LayeredSchemeStore) Get(schemeId string) StoreChannel {
+	return s.RunQuery(func(supplier LayeredStoreSupplier) *LayeredStoreSupplierResult {
+		return supplier.SchemeGet(s.TmpContext, schemeId)
+	})
+}
+
+func (s *LayeredSchemeStore) Delete(schemeId string) StoreChannel {
+	return s.RunQuery(func(supplier LayeredStoreSupplier) *LayeredStoreSupplierResult {
+		return supplier.SchemeDelete(s.TmpContext, schemeId)
+	})
+}