| /* |
| * 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" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common/constant" |
| "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 ( |
| // ECHO echo module name |
| ECHO = "echo" |
| ) |
| |
| func init() { |
| extension.SetFilter(ECHO, GetFilter) |
| } |
| |
| // EchoFilter health check |
| // RPCService need a Echo method in consumer, if you want to use EchoFilter |
| // eg: |
| // Echo func(ctx context.Context, arg interface{}, rsp *Xxx) error |
| type EchoFilter struct{} |
| |
| // Invoke response to the callers with its first argument. |
| func (ef *EchoFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| logger.Infof("invoking echo filter.") |
| logger.Debugf("%v,%v", invocation.MethodName(), len(invocation.Arguments())) |
| if invocation.MethodName() == constant.ECHO && len(invocation.Arguments()) == 1 { |
| return &protocol.RPCResult{ |
| Rest: invocation.Arguments()[0], |
| Attrs: invocation.Attachments(), |
| } |
| } |
| |
| return invoker.Invoke(ctx, invocation) |
| } |
| |
| // OnResponse dummy process, returns the result directly |
| func (ef *EchoFilter) OnResponse(_ context.Context, result protocol.Result, _ protocol.Invoker, |
| _ protocol.Invocation) protocol.Result { |
| |
| return result |
| } |
| |
| // GetFilter gets the Filter |
| func GetFilter() filter.Filter { |
| return &EchoFilter{} |
| } |