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/sqlstore/supplier.go

@@ -89,6 +89,7 @@ type SqlSupplierOldStores struct {
 	plugin               store.PluginStore
 	channelMemberHistory store.ChannelMemberHistoryStore
 	role                 store.RoleStore
+	scheme               store.SchemeStore
 }
 
 type SqlSupplier struct {
@@ -139,6 +140,7 @@ func NewSqlSupplier(settings model.SqlSettings, metrics einterfaces.MetricsInter
 
 	initSqlSupplierReactions(supplier)
 	initSqlSupplierRoles(supplier)
+	initSqlSupplierSchemes(supplier)
 
 	err := supplier.GetMaster().CreateTablesIfNotExists()
 	if err != nil {
@@ -462,6 +464,40 @@ func (ss *SqlSupplier) CreateColumnIfNotExists(tableName string, columnName stri
 	}
 }
 
+func (ss *SqlSupplier) CreateColumnIfNotExistsNoDefault(tableName string, columnName string, mySqlColType string, postgresColType string) bool {
+
+	if ss.DoesColumnExist(tableName, columnName) {
+		return false
+	}
+
+	if ss.DriverName() == model.DATABASE_DRIVER_POSTGRES {
+		_, err := ss.GetMaster().ExecNoTimeout("ALTER TABLE " + tableName + " ADD " + columnName + " " + postgresColType)
+		if err != nil {
+			l4g.Critical(utils.T("store.sql.create_column.critical"), err)
+			time.Sleep(time.Second)
+			os.Exit(EXIT_CREATE_COLUMN_POSTGRES)
+		}
+
+		return true
+
+	} else if ss.DriverName() == model.DATABASE_DRIVER_MYSQL {
+		_, err := ss.GetMaster().ExecNoTimeout("ALTER TABLE " + tableName + " ADD " + columnName + " " + mySqlColType)
+		if err != nil {
+			l4g.Critical(utils.T("store.sql.create_column.critical"), err)
+			time.Sleep(time.Second)
+			os.Exit(EXIT_CREATE_COLUMN_MYSQL)
+		}
+
+		return true
+
+	} else {
+		l4g.Critical(utils.T("store.sql.create_column_missing_driver.critical"))
+		time.Sleep(time.Second)
+		os.Exit(EXIT_CREATE_COLUMN_MISSING)
+		return false
+	}
+}
+
 func (ss *SqlSupplier) RemoveColumnIfExists(tableName string, columnName string) bool {
 
 	if !ss.DoesColumnExist(tableName, columnName) {
@@ -834,6 +870,10 @@ func (ss *SqlSupplier) Role() store.RoleStore {
 	return ss.oldStores.role
 }
 
+func (ss *SqlSupplier) Scheme() store.SchemeStore {
+	return ss.oldStores.scheme
+}
+
 func (ss *SqlSupplier) DropAllTables() {
 	ss.master.TruncateTables()
 }