refactor: merge tenant configuration into tenant registry

server/internal/library/imtenant/db.go

@@ -20,6 +20,7 @@ import (
 var tenantDbGroups sync.Map
 
 const registryDbGroup = "imRegistry"
+const sharedBusinessDatabase = "meeting_im"
 
 var registryDbGroupOnce sync.Once
 
@@ -47,19 +48,15 @@ func DB(ctx context.Context, tenantId int64) (db gdb.DB, tenant *entity.ImTenant
 // Tenant isolation inside this database is implemented by tenant_id predicates
 // and the three tenant-partitioned high-volume table families.
 func SharedDB(ctx context.Context) (gdb.DB, error) {
-	var sharedTenant *entity.ImTenant
-	if err := RegistryDB().Model(dao.ImTenant.Table()).Safe().Ctx(ctx).
-		Where(dao.ImTenant.Columns().Code, "default").Scan(&sharedTenant); err != nil {
-		return nil, gerror.Wrap(err, "获取共享业务库配置失败")
+	defaultLink := defaultDbLink(ctx)
+	if defaultLink == "" {
+		return nil, gerror.New("默认数据库连接未配置，无法连接共享业务库")
 	}
-	if sharedTenant == nil || sharedTenant.Id <= 0 {
-		return nil, gerror.New("默认商户不存在，无法确定共享业务库")
-	}
-	link, err := tenantLink(ctx, sharedTenant)
+	link, err := replaceMySQLDatabase(defaultLink, sharedBusinessDatabase)
 	if err != nil {
 		return nil, err
 	}
-	return dbForLink(link, sharedTenant.Id)
+	return dbForLink(link, 0)
 }
 
 func dbForLink(link string, ownerID int64) (gdb.DB, error) {
@@ -111,31 +108,6 @@ func ensureRegistryDBGroup() {
 	_ = gdb.SetConfigGroup(registryDbGroup, cloned)
 }
 
-func tenantLink(ctx context.Context, tenant *entity.ImTenant) (string, error) {
-	if tenant.DbDsn != "" {
-		return normalizeMySQLTimeOptions(tenant.DbDsn)
-	}
-	if tenant.DbName == "" {
-		// 未配置独立业务库的商户回落共享默认库
-		defaultLink := defaultDbLink(ctx)
-		if defaultLink == "" {
-			return "", gerror.New("默认数据库连接未配置，无法回落共享业务库")
-		}
-		return normalizeMySQLTimeOptions(defaultLink)
-	}
-
-	defaultLink := defaultDbLink(ctx)
-	if defaultLink == "" {
-		return "", gerror.New("默认数据库连接未配置，无法推导租户业务库连接")
-	}
-
-	link, err := replaceMySQLDatabase(defaultLink, tenant.DbName)
-	if err != nil {
-		return "", err
-	}
-	return link, nil
-}
-
 func defaultDbLink(ctx context.Context) string {
 	if configs, err := gdb.GetConfigGroup("default"); err == nil && len(configs) > 0 {
 		if configs[0].Link != "" {