| /* |
| * 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 metrics |
| |
| import ( |
| "context" |
| "time" |
| ) |
| |
| 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/metrics" |
| "dubbo.apache.org/dubbo-go/v3/metrics/rpc" |
| "dubbo.apache.org/dubbo-go/v3/protocol" |
| ) |
| |
| // must initialize before using the filter and after loading configuration |
| var metricFilterInstance *metricsFilter |
| |
| func init() { |
| extension.SetFilter(constant.MetricsFilterKey, newFilter) |
| } |
| |
| // metricsFilter will report RPC metrics to the metrics bus and implements the filter.Filter interface |
| type metricsFilter struct{} |
| |
| // Invoke publish the BeforeInvokeEvent and AfterInvokeEvent to metrics bus |
| func (mf *metricsFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| metrics.Publish(rpc.NewBeforeInvokeEvent(invoker, invocation)) |
| start := time.Now() |
| res := invoker.Invoke(ctx, invocation) |
| end := time.Now() |
| duration := end.Sub(start) |
| metrics.Publish(rpc.NewAfterInvokeEvent(invoker, invocation, duration, res)) |
| return res |
| } |
| |
| // OnResponse do nothing and return the result |
| func (mf *metricsFilter) OnResponse(ctx context.Context, res protocol.Result, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| return res |
| } |
| |
| // newFilter creates a new metricsFilter instance. |
| // |
| // It's lazy initialization, |
| // and make sure that the configuration had been loaded before invoking this method. |
| func newFilter() filter.Filter { |
| if metricFilterInstance == nil { |
| metricFilterInstance = &metricsFilter{} |
| } |
| return metricFilterInstance |
| } |