| /* |
| * 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 cluster_impl |
| |
| import ( |
| "context" |
| ) |
| import ( |
| "github.com/apache/dubbo-go/cluster" |
| "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/protocol" |
| ) |
| |
| /** |
| * When invoke fails, log the error message and ignore this error by returning an empty Result. |
| * Usually used to write audit logs and other operations |
| * |
| * <a href="http://en.wikipedia.org/wiki/Fail-safe">Fail-safe</a> |
| * |
| */ |
| type failsafeClusterInvoker struct { |
| baseClusterInvoker |
| } |
| |
| func newFailsafeClusterInvoker(directory cluster.Directory) protocol.Invoker { |
| return &failsafeClusterInvoker{ |
| baseClusterInvoker: newBaseClusterInvoker(directory), |
| } |
| } |
| |
| // nolint |
| func (invoker *failsafeClusterInvoker) Invoke(ctx context.Context, invocation protocol.Invocation) protocol.Result { |
| invokers := invoker.directory.List(invocation) |
| |
| err := invoker.checkInvokers(invokers, invocation) |
| if err != nil { |
| return &protocol.RPCResult{} |
| } |
| |
| url := invokers[0].GetUrl() |
| methodName := invocation.MethodName() |
| //Get the service loadbalance config |
| lb := url.GetParam(constant.LOADBALANCE_KEY, constant.DEFAULT_LOADBALANCE) |
| //Get the service method loadbalance config if have |
| if v := url.GetMethodParam(methodName, constant.LOADBALANCE_KEY, ""); v != "" { |
| lb = v |
| } |
| loadbalance := extension.GetLoadbalance(lb) |
| |
| invoked := make([]protocol.Invoker, 0) |
| var result protocol.Result |
| |
| ivk := invoker.doSelect(loadbalance, invocation, invokers, invoked) |
| //DO INVOKE |
| result = ivk.Invoke(ctx, invocation) |
| if result.Error() != nil { |
| // ignore |
| logger.Errorf("Failsafe ignore exception: %v.\n", result.Error().Error()) |
| return &protocol.RPCResult{} |
| } |
| return result |
| } |