mirror of https://github.com/grpc/grpc-java.git
99 lines
3.4 KiB
Java
99 lines
3.4 KiB
Java
/*
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* Copyright 2018 The gRPC Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.grpc.examples.advanced;
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import com.google.protobuf.InvalidProtocolBufferException;
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import com.google.protobuf.Message;
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import com.google.protobuf.Message.Builder;
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import com.google.protobuf.util.JsonFormat;
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import com.google.protobuf.util.JsonFormat.Parser;
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import com.google.protobuf.util.JsonFormat.Printer;
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import io.grpc.MethodDescriptor.Marshaller;
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import io.grpc.Status;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.nio.charset.Charset;
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/**
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* A {@link Marshaller} for JSON. This marshals in the Protobuf 3 format described here:
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* https://developers.google.com/protocol-buffers/docs/proto3#json
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*/
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final class JsonMarshaller {
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private JsonMarshaller() {}
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/**
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* Create a {@code Marshaller} for json protos of the same type as {@code defaultInstance}.
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*
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* <p>This is an unstable API and has not been optimized yet for performance.
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*/
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public static <T extends Message> Marshaller<T> jsonMarshaller(final T defaultInstance) {
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final Parser parser = JsonFormat.parser();
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final Printer printer = JsonFormat.printer();
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return jsonMarshaller(defaultInstance, parser, printer);
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}
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/**
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* Create a {@code Marshaller} for json protos of the same type as {@code defaultInstance}.
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*
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* <p>This is an unstable API and has not been optimized yet for performance.
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*/
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public static <T extends Message> Marshaller<T> jsonMarshaller(
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final T defaultInstance, final Parser parser, final Printer printer) {
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final Charset charset = Charset.forName("UTF-8");
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return new Marshaller<T>() {
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@Override
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public InputStream stream(T value) {
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try {
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return new ByteArrayInputStream(printer.print(value).getBytes(charset));
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} catch (InvalidProtocolBufferException e) {
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throw Status.INTERNAL
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.withCause(e)
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.withDescription("Unable to print json proto")
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.asRuntimeException();
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}
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}
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@SuppressWarnings("unchecked")
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@Override
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public T parse(InputStream stream) {
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Builder builder = defaultInstance.newBuilderForType();
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Reader reader = new InputStreamReader(stream, charset);
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T proto;
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try {
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parser.merge(reader, builder);
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proto = (T) builder.build();
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reader.close();
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} catch (InvalidProtocolBufferException e) {
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throw Status.INTERNAL.withDescription("Invalid protobuf byte sequence")
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.withCause(e).asRuntimeException();
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} catch (IOException e) {
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// Same for now, might be unavailable
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throw Status.INTERNAL.withDescription("Invalid protobuf byte sequence")
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.withCause(e).asRuntimeException();
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}
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return proto;
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}
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};
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}
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}
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