| /* |
| * Copyright 2014, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package io.grpc.proto; |
| |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import com.google.protobuf.Message; |
| import com.google.protobuf.MessageLite; |
| import com.google.protobuf.Parser; |
| |
| import io.grpc.Marshaller; |
| import io.grpc.Metadata; |
| import io.grpc.Status; |
| |
| import java.io.InputStream; |
| |
| /** |
| * Utility methods for using protobuf with grpc. |
| */ |
| public class ProtoUtils { |
| |
| /** Adapt a {@code Parser} to a {@code Marshaller}. */ |
| public static <T extends MessageLite> Marshaller<T> marshaller(final Parser<T> parser) { |
| return new Marshaller<T>() { |
| @Override |
| public InputStream stream(T value) { |
| return new DeferredProtoInputStream(value); |
| } |
| |
| @Override |
| public T parse(InputStream stream) { |
| try { |
| return parser.parseFrom(stream); |
| } catch (InvalidProtocolBufferException ipbe) { |
| throw Status.INTERNAL.withDescription("Invalid protobuf byte sequence") |
| .withCause(ipbe).asRuntimeException(); |
| } |
| } |
| }; |
| } |
| |
| /** |
| * Produce a metadata key for a generated protobuf type. |
| */ |
| public static <T extends Message> Metadata.Key<T> keyForProto(final T instance) { |
| return Metadata.Key.of( |
| instance.getDescriptorForType().getFullName() + Metadata.BINARY_HEADER_SUFFIX, |
| new Metadata.BinaryMarshaller<T>() { |
| @Override |
| public byte[] toBytes(T value) { |
| return value.toByteArray(); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public T parseBytes(byte[] serialized) { |
| try { |
| return (T) instance.getParserForType().parseFrom(serialized); |
| } catch (InvalidProtocolBufferException ipbe) { |
| throw new IllegalArgumentException(ipbe); |
| } |
| } |
| }); |
| } |
| |
| private ProtoUtils() { |
| } |
| } |