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/*
* 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.protobuf.lite;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.MessageLite;
import com.google.protobuf.Parser;
import io.grpc.ExperimentalApi;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor.Marshaller;
import io.grpc.Status;
import java.io.InputStream;
/**
* Utility methods for using protobuf with grpc.
*/
@ExperimentalApi("Experimental until Lite is stable in protobuf")
public class ProtoLiteUtils {
/** Create a {@code Marshaller} for protos of the same type as {@code defaultInstance}. */
public static <T extends MessageLite> Marshaller<T> marshaller(final T defaultInstance) {
@SuppressWarnings("unchecked")
final Parser<T> parser = (Parser<T>) defaultInstance.getParserForType();
return new Marshaller<T>() {
@Override
public InputStream stream(T value) {
return new ProtoInputStream(value, parser);
}
@Override
public T parse(InputStream stream) {
if (stream instanceof ProtoInputStream) {
ProtoInputStream protoStream = (ProtoInputStream) stream;
// Optimization for in-memory transport. Returning provided object is safe since protobufs
// are immutable.
//
// However, we can't assume the types match, so we have to verify the parser matches.
// Today the parser is always the same for a given proto, but that isn't guaranteed. Even
// if not, using the same MethodDescriptor would ensure the parser matches and permit us
// to enable this optimization.
if (protoStream.parser() == parser) {
try {
@SuppressWarnings("unchecked")
T message = (T) ((ProtoInputStream) stream).message();
return message;
} catch (IllegalStateException ex) {
// Stream must have been read from, which is a strange state. Since the point of this
// optimization is to be transparent, instead of throwing an error we'll continue,
// even though it seems likely there's a bug.
}
}
}
try {
return parseFrom(stream);
} catch (InvalidProtocolBufferException ipbe) {
throw Status.INTERNAL.withDescription("Invalid protobuf byte sequence")
.withCause(ipbe).asRuntimeException();
}
}
private T parseFrom(InputStream stream) throws InvalidProtocolBufferException {
// Pre-create the CodedInputStream so that we can remove the size limit restriction
// when parsing.
CodedInputStream codedInput = CodedInputStream.newInstance(stream);
codedInput.setSizeLimit(Integer.MAX_VALUE);
T message = parser.parseFrom(codedInput);
try {
codedInput.checkLastTagWas(0);
return message;
} catch (InvalidProtocolBufferException e) {
e.setUnfinishedMessage(message);
throw e;
}
}
};
}
/**
* Produce a metadata marshaller for a protobuf type.
*/
public static <T extends MessageLite> Metadata.BinaryMarshaller<T> metadataMarshaller(
final T instance) {
return 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 ProtoLiteUtils() {
}
}
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