| /* |
| * 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 seata provides a filter when use seata-golang, use this filter to transfer xid. |
| package seata |
| |
| import ( |
| "context" |
| "strings" |
| "sync" |
| ) |
| |
| import ( |
| "github.com/dubbogo/gost/log/logger" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/common/constant" |
| "dubbo.apache.org/dubbo-go/v3/common/extension" |
| "dubbo.apache.org/dubbo-go/v3/filter" |
| "dubbo.apache.org/dubbo-go/v3/protocol" |
| ) |
| |
| const ( |
| SEATA_XID = constant.DubboCtxKey("SEATA_XID") |
| ) |
| |
| var ( |
| once sync.Once |
| seata *seataFilter |
| ) |
| |
| func init() { |
| extension.SetFilter(constant.SeataFilterKey, newSeataFilter) |
| } |
| |
| type seataFilter struct{} |
| |
| func newSeataFilter() filter.Filter { |
| if seata == nil { |
| once.Do(func() { |
| seata = &seataFilter{} |
| }) |
| } |
| return seata |
| } |
| |
| // Invoke Get Xid by attachment key `SEATA_XID`. When use Seata, transfer xid by attachments |
| func (f *seataFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| xid := invocation.GetAttachmentWithDefaultValue(string(SEATA_XID), "") |
| if len(strings.TrimSpace(xid)) > 0 { |
| 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 (f *seataFilter) OnResponse(ctx context.Context, result protocol.Result, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| return result |
| } |