| /* |
| * 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 proxy |
| |
| import ( |
| "context" |
| ) |
| |
| import ( |
| "github.com/jhump/protoreflect/desc" |
| "github.com/jhump/protoreflect/dynamic" |
| "github.com/jhump/protoreflect/grpcreflect" |
| "github.com/pkg/errors" |
| ) |
| |
| type Reflector struct { |
| c *grpcreflect.Client |
| } |
| |
| // NewReflector creates a new Reflector from the reflection client |
| func NewReflector(client *grpcreflect.Client) *Reflector { |
| return &Reflector{client} |
| } |
| |
| // CreateInvocation creates a MethodInvocation by performing reflection |
| func (r *Reflector) CreateInvocation(ctx context.Context, serviceName, methodName string, input []byte) (*MethodInvocation, error) { |
| var ( |
| serviceDesc *desc.ServiceDescriptor |
| err error |
| ) |
| |
| if protosetSource != nil { |
| // Parsing reflection through protoset files |
| var dsc desc.Descriptor |
| dsc, err = protosetSource.FindSymbol(serviceName) |
| if err != nil { |
| return nil, errors.Errorf("service was not found upstream even though it should have been there: %v", err) |
| } |
| |
| var ok bool |
| serviceDesc, ok = dsc.(*desc.ServiceDescriptor) |
| if !ok { |
| return nil, errors.Errorf("target server does not expose service %s", serviceName) |
| } |
| } else { |
| serviceDesc, err = r.c.ResolveService(serviceName) |
| if err != nil { |
| return nil, err |
| } |
| } |
| |
| methodDesc := serviceDesc.FindMethodByName(methodName) |
| if methodDesc == nil { |
| return nil, errors.New("method not found upstream") |
| } |
| inputMessage := dynamic.NewMessage(methodDesc.GetInputType()) |
| err = inputMessage.UnmarshalJSON(input) |
| if err != nil { |
| return nil, err |
| } |
| return &MethodInvocation{ |
| MethodDescriptor: methodDesc, |
| Message: inputMessage, |
| }, nil |
| } |
| |
| // MethodInvocation contains a method and a message used to invoke an RPC |
| type MethodInvocation struct { |
| *desc.MethodDescriptor |
| *dynamic.Message |
| } |