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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.
102 lines
3.8 KiB
Java
102 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 final 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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