mirror of
https://github.com/google/nomulus.git
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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
76 lines
2.9 KiB
Java
76 lines
2.9 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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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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package google.registry.backup;
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import static google.registry.model.ofy.ObjectifyService.ofy;
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import com.google.appengine.api.datastore.EntityTranslator;
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import com.google.common.collect.AbstractIterator;
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import com.google.common.collect.ImmutableList;
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import com.google.storage.onestore.v3.OnestoreEntity.EntityProto;
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import google.registry.model.ImmutableObject;
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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.OutputStream;
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import java.util.Iterator;
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/** Utilities for working with backups. */
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public class BackupUtils {
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/** Keys for user metadata fields on commit log files in GCS. */
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public static final class GcsMetadataKeys {
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private GcsMetadataKeys() {}
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public static final String NUM_TRANSACTIONS = "num_transactions";
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public static final String LOWER_BOUND_CHECKPOINT = "lower_bound_checkpoint";
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public static final String UPPER_BOUND_CHECKPOINT = "upper_bound_checkpoint";
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}
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/**
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* Converts the given {@link ImmutableObject} to a raw datastore entity and write it to an
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* {@link OutputStream} in delimited protocol buffer format.
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*/
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static void serializeEntity(ImmutableObject entity, OutputStream stream) throws IOException {
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EntityTranslator.convertToPb(ofy().save().toEntity(entity)).writeDelimitedTo(stream);
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}
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/**
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* Return an iterator of {@link ImmutableObject} instances deserialized from the given stream.
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*
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* <p>This parses out delimited protocol buffers for raw datastore entities and then Ofy-loads
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* those as {@link ImmutableObject}.
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*
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* <p>The iterator reads from the stream on demand, and as such will fail if the stream is closed.
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*/
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public static Iterator<ImmutableObject> createDeserializingIterator(final InputStream input) {
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return new AbstractIterator<ImmutableObject>() {
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@Override
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protected ImmutableObject computeNext() {
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EntityProto proto = new EntityProto();
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if (proto.parseDelimitedFrom(input)) { // False means end of stream; other errors throw.
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return ofy().load().<ImmutableObject>fromEntity(EntityTranslator.createFromPb(proto));
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}
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return endOfData();
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}};
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}
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public static ImmutableList<ImmutableObject> deserializeEntities(byte[] bytes) {
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return ImmutableList.copyOf(createDeserializingIterator(new ByteArrayInputStream(bytes)));
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}
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}
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