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/*
* 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 org.apache.dubbo.rpc.protocol.tri.service;
import org.apache.dubbo.common.stream.StreamObserver;
import org.apache.dubbo.rpc.TriRpcStatus;
import com.google.protobuf.Descriptors.FileDescriptor;
import io.grpc.reflection.v1alpha.DubboServerReflectionTriple;
import io.grpc.reflection.v1alpha.ErrorResponse;
import io.grpc.reflection.v1alpha.ExtensionNumberResponse;
import io.grpc.reflection.v1alpha.ExtensionRequest;
import io.grpc.reflection.v1alpha.FileDescriptorResponse;
import io.grpc.reflection.v1alpha.ListServiceResponse;
import io.grpc.reflection.v1alpha.ServerReflectionRequest;
import io.grpc.reflection.v1alpha.ServerReflectionResponse;
import io.grpc.reflection.v1alpha.ServiceResponse;
import java.util.ArrayDeque;
import java.util.HashSet;
import java.util.Queue;
import java.util.Set;
/**
* Provides a reflection service for Protobuf service for service test and dynamic gateway.
*
* @link https://github.com/grpc/grpc/blob/master/doc/server-reflection.md
*/
public class ReflectionV1AlphaService extends DubboServerReflectionTriple.ServerReflectionImplBase {
@Override
public StreamObserver serverReflectionInfo(
StreamObserver responseObserver) {
return new StreamObserver() {
@Override
public void onNext(ServerReflectionRequest request) {
switch (request.getMessageRequestCase()) {
case FILE_BY_FILENAME:
getFileByName(request, responseObserver);
break;
case FILE_CONTAINING_SYMBOL:
getFileContainingSymbol(request, responseObserver);
break;
case FILE_CONTAINING_EXTENSION:
getFileByExtension(request, responseObserver);
break;
case ALL_EXTENSION_NUMBERS_OF_TYPE:
getAllExtensions(request, responseObserver);
break;
case LIST_SERVICES:
listServices(request, responseObserver);
break;
default:
sendErrorResponse(
request,
TriRpcStatus.Code.UNIMPLEMENTED,
"not implemented " + request.getMessageRequestCase(), responseObserver);
}
}
@Override
public void onError(Throwable throwable) {
responseObserver.onError(throwable);
}
@Override
public void onCompleted() {
responseObserver.onCompleted();
}
};
}
private void getFileByName(ServerReflectionRequest request,
StreamObserver responseObserver) {
String name = request.getFileByFilename();
FileDescriptor fd = SchemaDescriptorRegistry.getSchemaDescriptor(name);
if (fd != null) {
responseObserver.onNext(createServerReflectionResponse(request, fd));
} else {
sendErrorResponse(request, TriRpcStatus.Code.NOT_FOUND, "File not found.",
responseObserver);
}
}
private void getFileContainingSymbol(ServerReflectionRequest request,
StreamObserver responseObserver) {
String symbol = request.getFileContainingSymbol();
FileDescriptor fd = SchemaDescriptorRegistry.getSchemaDescriptor(symbol);
if (fd != null) {
responseObserver.onNext(createServerReflectionResponse(request, fd));
} else {
sendErrorResponse(request, TriRpcStatus.Code.NOT_FOUND, "Symbol not found.",
responseObserver);
}
}
private void getFileByExtension(ServerReflectionRequest request,
StreamObserver responseObserver) {
ExtensionRequest extensionRequest = request.getFileContainingExtension();
String type = extensionRequest.getContainingType();
int extension = extensionRequest.getExtensionNumber();
FileDescriptor fd =
SchemaDescriptorRegistry.getFileDescriptorByExtensionAndNumber(type, extension);
if (fd != null) {
responseObserver.onNext(createServerReflectionResponse(request, fd));
} else {
sendErrorResponse(request, TriRpcStatus.Code.NOT_FOUND, "Extension not found.",
responseObserver);
}
}
private void getAllExtensions(ServerReflectionRequest request,
StreamObserver responseObserver) {
String type = request.getAllExtensionNumbersOfType();
Set extensions = SchemaDescriptorRegistry.getExtensionNumbers(type);
if (extensions != null) {
ExtensionNumberResponse.Builder builder =
ExtensionNumberResponse.newBuilder()
.setBaseTypeName(type)
.addAllExtensionNumber(extensions);
responseObserver.onNext(
ServerReflectionResponse.newBuilder()
.setValidHost(request.getHost())
.setOriginalRequest(request)
.setAllExtensionNumbersResponse(builder)
.build());
} else {
sendErrorResponse(request, TriRpcStatus.Code.NOT_FOUND, "Type not found.",
responseObserver);
}
}
private void listServices(ServerReflectionRequest request,
StreamObserver responseObserver) {
ListServiceResponse.Builder builder = ListServiceResponse.newBuilder();
for (String serviceName : SchemaDescriptorRegistry.listServiceNames()) {
builder.addService(ServiceResponse.newBuilder().setName(serviceName));
}
responseObserver.onNext(
ServerReflectionResponse.newBuilder()
.setValidHost(request.getHost())
.setOriginalRequest(request)
.setListServicesResponse(builder)
.build());
}
private void sendErrorResponse(
ServerReflectionRequest request, TriRpcStatus.Code code, String message,
StreamObserver responseObserver) {
ServerReflectionResponse response =
ServerReflectionResponse.newBuilder()
.setValidHost(request.getHost())
.setOriginalRequest(request)
.setErrorResponse(
ErrorResponse.newBuilder()
.setErrorCode(code.code)
.setErrorMessage(message))
.build();
responseObserver.onNext(response);
}
private ServerReflectionResponse createServerReflectionResponse(
ServerReflectionRequest request, FileDescriptor fd) {
FileDescriptorResponse.Builder fdRBuilder = FileDescriptorResponse.newBuilder();
Set seenFiles = new HashSet<>();
Queue frontier = new ArrayDeque<>();
seenFiles.add(fd.getName());
frontier.add(fd);
while (!frontier.isEmpty()) {
FileDescriptor nextFd = frontier.remove();
fdRBuilder.addFileDescriptorProto(nextFd.toProto().toByteString());
for (FileDescriptor dependencyFd : nextFd.getDependencies()) {
if (!seenFiles.contains(dependencyFd.getName())) {
seenFiles.add(dependencyFd.getName());
frontier.add(dependencyFd);
}
}
}
return ServerReflectionResponse.newBuilder()
.setValidHost(request.getHost())
.setOriginalRequest(request)
.setFileDescriptorResponse(fdRBuilder)
.build();
}
}