io.github.microcks.util.grpc.GrpcUtil Maven / Gradle / Ivy

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/*
 * Copyright The Microcks Authors.
 *
 * Licensed 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 io.github.microcks.util.grpc;

import com.google.protobuf.DescriptorProtos;
import com.google.protobuf.Descriptors;
import com.google.protobuf.InvalidProtocolBufferException;
import io.grpc.MethodDescriptor;
import io.grpc.protobuf.services.BinaryLogProvider;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;

/**
 * Helper class containing utility methods related to Grpc/Protobuf decriptors.
 * @author laurent
 */
public class GrpcUtil {

   /**
    * Find a Protobuf method descriptor using a base64 encoded representation of the proto descriptor + service and method name.
    * @param base64ProtobufDescriptor The encoded representation of proto descriptor as produced by protoc.
    * @param serviceName The name of the service to get method for.
    * @param methodName The name of the method.
    * @return A Protobuf MethodDescriptor
    * @throws UnsupportedEncodingException If base64 content is not encoded in uTF-8
    * @throws InvalidProtocolBufferException If representation is not understood as protobuf descriptor.
    * @throws Descriptors.DescriptorValidationException If included FileDescriptor cannot be validated.
    */
   public static Descriptors.MethodDescriptor findMethodDescriptor(String base64ProtobufDescriptor, String serviceName, String methodName)
         throws UnsupportedEncodingException, InvalidProtocolBufferException, Descriptors.DescriptorValidationException{

      // Protobuf binary descriptor has been encoded in base64 to be stored as a string.
      // Decode it and recreate DescriptorProtos objects.
      byte[] decodedBinaryPB = Base64.getDecoder().decode(base64ProtobufDescriptor.getBytes("UTF-8"));
      DescriptorProtos.FileDescriptorSet fds = DescriptorProtos.FileDescriptorSet.parseFrom(decodedBinaryPB);

      Descriptors.ServiceDescriptor sd = null;
      if (fds.getFileCount() > 1) {
         // Build dependencies.
         List dependencies = new ArrayList<>();
         for (int i=0; i buildGenericUnaryMethodDescriptor(String fullMethodName) {
      return MethodDescriptor.newBuilder(BinaryLogProvider.BYTEARRAY_MARSHALLER, BinaryLogProvider.BYTEARRAY_MARSHALLER)
            .setType(MethodDescriptor.MethodType.UNARY)
            .setFullMethodName(fullMethodName)
            .build();
   }
}