| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package filter_impl |
| |
| import ( |
| "context" |
| "strings" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common/extension" |
| "github.com/apache/dubbo-go/common/logger" |
| "github.com/apache/dubbo-go/filter" |
| "github.com/apache/dubbo-go/protocol" |
| ) |
| |
| const ( |
| SEATA = "seata" |
| SEATA_XID = "SEATA_XID" |
| ) |
| |
| func init() { |
| extension.SetFilter(SEATA, getSeataFilter) |
| } |
| |
| // SeataFilter when use seata-golang, use this filter to transfer xid |
| type SeataFilter struct{} |
| |
| // When use Seata, transfer xid by attachments |
| // Invoke Get Xid by attachment key `SEATA_XID` |
| func (sf *SeataFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| logger.Infof("invoking seata filter.") |
| xid := invocation.AttachmentsByKey(SEATA_XID, "") |
| if strings.TrimSpace(xid) != "" { |
| logger.Debugf("Method: %v,Xid: %v", invocation.MethodName(), xid) |
| return invoker.Invoke(context.WithValue(ctx, SEATA_XID, xid), invocation) |
| } |
| return invoker.Invoke(ctx, invocation) |
| } |
| |
| // OnResponse dummy process, returns the result directly |
| func (sf *SeataFilter) OnResponse(ctx context.Context, result protocol.Result, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| return result |
| } |
| |
| // getSeataFilter create SeataFilter instance |
| func getSeataFilter() filter.Filter { |
| return &SeataFilter{} |
| } |