| // Licensed to 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. Apache Software Foundation (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 grpc |
| |
| import ( |
| "context" |
| |
| "github.com/go-kratos/kratos/v2/middleware" |
| "github.com/go-kratos/kratos/v2/transport" |
| "github.com/go-kratos/kratos/v2/transport/grpc" |
| |
| "github.com/apache/skywalking-go/plugins/core/log" |
| "github.com/apache/skywalking-go/plugins/core/operator" |
| "github.com/apache/skywalking-go/plugins/core/tracing" |
| ) |
| |
| var serverMiddleware = func(handler middleware.Handler) middleware.Handler { |
| return func(c context.Context, req interface{}) (interface{}, error) { |
| if tr, ok := transport.FromServerContext(c); ok { |
| span, err := tracing.CreateEntrySpan(tr.Operation(), func(key string) (string, error) { |
| return tr.RequestHeader().Get(key), nil |
| }, tracing.WithComponent(5010), |
| tracing.WithLayer(tracing.SpanLayerRPCFramework), |
| tracing.WithTag("transport", "gRPC")) |
| if err != nil { |
| log.Warnf("cannot create entry span: %v", err) |
| return handler(c, req) |
| } |
| defer span.End() |
| |
| reply, err := handler(c, req) |
| if err != nil { |
| span.Error(err.Error()) |
| } |
| return reply, err |
| } |
| return handler(c, req) |
| } |
| } |
| |
| type MiddlewareInterceptor struct { |
| } |
| |
| func (n *MiddlewareInterceptor) BeforeInvoke(invocation operator.Invocation) error { |
| if tracing.GetRuntimeContextValue(ignoreServerMiddlewareKey) != nil { |
| tracing.SetRuntimeContextValue(ignoreServerMiddlewareKey, nil) |
| return nil |
| } |
| middlewares := invocation.Args()[0].([]middleware.Middleware) |
| middlewares = append(middlewares, serverMiddleware) |
| invocation.ChangeArg(0, middlewares) |
| invocation.SetContext(true) |
| return nil |
| } |
| |
| func (n *MiddlewareInterceptor) AfterInvoke(invocation operator.Invocation, results ...interface{}) error { |
| if invocation.GetContext() != true { |
| return nil |
| } |
| opt := results[0].(grpc.ServerOption) |
| // wrapper the server option, and adding the true value to the server to let the interceptor know the server has been enhanced |
| var serverOption grpc.ServerOption = func(server *grpc.Server) { |
| opt(server) |
| var serverRef interface{} = server |
| if enhance, ok := serverRef.(operator.EnhancedInstance); ok { |
| enhance.SetSkyWalkingDynamicField(true) |
| } |
| } |
| invocation.DefineReturnValues(serverOption) |
| return nil |
| } |