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99 lines
3.8 KiB
Java
99 lines
3.8 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.gcs;
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import static com.google.common.collect.Iterables.getLast;
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import com.google.appengine.tools.cloudstorage.GcsFileMetadata;
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import com.google.appengine.tools.cloudstorage.GcsFileOptions;
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import com.google.appengine.tools.cloudstorage.GcsFileOptions.Builder;
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import com.google.appengine.tools.cloudstorage.GcsFilename;
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import com.google.appengine.tools.cloudstorage.GcsService;
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import com.google.common.base.Splitter;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.net.MediaType;
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import google.registry.config.ConfigModule.Config;
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import google.registry.util.FormattingLogger;
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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.nio.ByteBuffer;
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import java.nio.channels.Channels;
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import javax.annotation.CheckReturnValue;
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import javax.inject.Inject;
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/** Utilities for working with Google Cloud Storage. */
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public class GcsUtils {
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private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
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private static final ImmutableMap<String, MediaType> EXTENSIONS =
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new ImmutableMap.Builder<String, MediaType>()
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.put("ghostryde", MediaType.APPLICATION_BINARY)
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.put("length", MediaType.PLAIN_TEXT_UTF_8)
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.put("json", MediaType.JSON_UTF_8)
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.build();
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private final GcsService gcsService;
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private final int bufferSize;
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@Inject
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public GcsUtils(GcsService gcsService, @Config("gcsBufferSize") int bufferSize) {
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this.gcsService = gcsService;
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this.bufferSize = bufferSize;
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}
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/** Opens a GCS file for reading as an {@link InputStream} with prefetching. */
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@CheckReturnValue
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public InputStream openInputStream(GcsFilename filename) {
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return Channels.newInputStream(gcsService.openPrefetchingReadChannel(filename, 0, bufferSize));
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}
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/** Opens a GCS file for writing as an {@link OutputStream}, overwriting existing files. */
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@CheckReturnValue
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public OutputStream openOutputStream(GcsFilename filename) throws IOException {
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return Channels.newOutputStream(gcsService.createOrReplace(filename, getOptions(filename)));
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}
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/** Creates a GCS file with the given byte contents, overwriting existing files. */
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public void createFromBytes(GcsFilename filename, byte[] bytes) throws IOException {
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gcsService.createOrReplace(filename, getOptions(filename), ByteBuffer.wrap(bytes));
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}
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/** Returns {@code true} if a file exists and is non-empty on Google Cloud Storage. */
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public boolean existsAndNotEmpty(GcsFilename file) {
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GcsFileMetadata metadata;
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try {
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metadata = gcsService.getMetadata(file);
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} catch (IOException e) {
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logger.warning(e, "Failed to check if GCS file exists");
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return false;
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}
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if (metadata == null) {
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return false;
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}
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return metadata.getLength() > 0;
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}
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/** Determines most appropriate {@link GcsFileOptions} based on filename extension. */
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private static GcsFileOptions getOptions(GcsFilename filename) {
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Builder builder = new GcsFileOptions.Builder().cacheControl("no-cache");
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MediaType mediaType = EXTENSIONS.get(getLast(Splitter.on('.').split(filename.getObjectName())));
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if (mediaType != null) {
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builder = builder.mimeType(mediaType.type());
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}
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return builder.build();
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}
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}
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