| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.filesystem; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | import static com.google.common.base.Preconditions.checkState; |
| 23 | import static com.google.common.base.Throwables.getCausalChain; |
| 24 | import static com.google.common.base.Throwables.propagate; |
| 25 | import static com.google.common.collect.Iterables.filter; |
| 26 | import static com.google.common.collect.Iterables.find; |
| 27 | import static com.google.common.collect.Iterables.size; |
| 28 | import static com.google.common.collect.Iterables.transform; |
| 29 | import static com.google.common.collect.Lists.newArrayList; |
| 30 | import static com.google.common.collect.Lists.partition; |
| 31 | import static com.google.common.collect.Maps.newHashMap; |
| 32 | import static com.google.common.collect.Sets.filter; |
| 33 | import static com.google.common.collect.Sets.newTreeSet; |
| 34 | import static com.google.common.io.ByteStreams.toByteArray; |
| 35 | import static com.google.common.util.concurrent.Futures.immediateFailedFuture; |
| 36 | import static com.google.common.util.concurrent.Futures.immediateFuture; |
| 37 | |
| 38 | import java.io.ByteArrayInputStream; |
| 39 | import java.io.ByteArrayOutputStream; |
| 40 | import java.io.File; |
| 41 | import java.io.IOException; |
| 42 | import java.io.ObjectInput; |
| 43 | import java.io.ObjectInputStream; |
| 44 | import java.io.ObjectOutput; |
| 45 | import java.io.ObjectOutputStream; |
| 46 | import java.net.URI; |
| 47 | import java.util.Collection; |
| 48 | import java.util.Date; |
| 49 | import java.util.List; |
| 50 | import java.util.Map; |
| 51 | import java.util.Set; |
| 52 | import java.util.SortedSet; |
| 53 | import java.util.TreeSet; |
| 54 | import java.util.Map.Entry; |
| 55 | import java.util.concurrent.ExecutorService; |
| 56 | |
| 57 | import javax.annotation.Nullable; |
| 58 | import javax.annotation.Resource; |
| 59 | import javax.inject.Inject; |
| 60 | import javax.inject.Named; |
| 61 | import javax.ws.rs.Path; |
| 62 | import javax.ws.rs.PathParam; |
| 63 | |
| 64 | import org.jclouds.Constants; |
| 65 | import org.jclouds.blobstore.BlobStoreContext; |
| 66 | import org.jclouds.blobstore.ContainerNotFoundException; |
| 67 | import org.jclouds.blobstore.KeyNotFoundException; |
| 68 | import org.jclouds.blobstore.domain.Blob; |
| 69 | import org.jclouds.blobstore.domain.BlobMetadata; |
| 70 | import org.jclouds.blobstore.domain.MutableBlobMetadata; |
| 71 | import org.jclouds.blobstore.domain.MutableStorageMetadata; |
| 72 | import org.jclouds.blobstore.domain.PageSet; |
| 73 | import org.jclouds.blobstore.domain.StorageMetadata; |
| 74 | import org.jclouds.blobstore.domain.StorageType; |
| 75 | import org.jclouds.blobstore.domain.Blob.Factory; |
| 76 | import org.jclouds.blobstore.domain.internal.MutableBlobMetadataImpl; |
| 77 | import org.jclouds.blobstore.domain.internal.MutableStorageMetadataImpl; |
| 78 | import org.jclouds.blobstore.domain.internal.PageSetImpl; |
| 79 | import org.jclouds.blobstore.functions.HttpGetOptionsListToGetOptions; |
| 80 | import org.jclouds.blobstore.internal.BaseAsyncBlobStore; |
| 81 | import org.jclouds.blobstore.options.CreateContainerOptions; |
| 82 | import org.jclouds.blobstore.options.GetOptions; |
| 83 | import org.jclouds.blobstore.options.ListContainerOptions; |
| 84 | import org.jclouds.blobstore.options.PutOptions; |
| 85 | import org.jclouds.blobstore.strategy.IfDirectoryReturnNameStrategy; |
| 86 | import org.jclouds.blobstore.util.BlobUtils; |
| 87 | import org.jclouds.collect.Memoized; |
| 88 | import org.jclouds.crypto.Crypto; |
| 89 | import org.jclouds.crypto.CryptoStreams; |
| 90 | import org.jclouds.date.DateService; |
| 91 | import org.jclouds.domain.Location; |
| 92 | import org.jclouds.filesystem.predicates.validators.FilesystemContainerNameValidator; |
| 93 | import org.jclouds.filesystem.strategy.FilesystemStorageStrategy; |
| 94 | import org.jclouds.http.HttpCommand; |
| 95 | import org.jclouds.http.HttpRequest; |
| 96 | import org.jclouds.http.HttpResponse; |
| 97 | import org.jclouds.http.HttpResponseException; |
| 98 | import org.jclouds.http.options.HttpRequestOptions; |
| 99 | import org.jclouds.io.Payload; |
| 100 | import org.jclouds.io.Payloads; |
| 101 | import org.jclouds.io.payloads.BaseMutableContentMetadata; |
| 102 | import org.jclouds.io.payloads.FilePayload; |
| 103 | import org.jclouds.logging.Logger; |
| 104 | import org.jclouds.rest.annotations.ParamValidators; |
| 105 | |
| 106 | import com.google.common.base.Function; |
| 107 | import com.google.common.base.Predicate; |
| 108 | import com.google.common.base.Supplier; |
| 109 | import com.google.common.base.Throwables; |
| 110 | import com.google.common.collect.Iterables; |
| 111 | import com.google.common.util.concurrent.Futures; |
| 112 | import com.google.common.util.concurrent.ListenableFuture; |
| 113 | |
| 114 | /** |
| 115 | * |
| 116 | * Preconditions: Blob name cannot start with / char (or \ under windows) |
| 117 | * |
| 118 | * @author Alfredo "Rainbowbreeze" Morresi |
| 119 | */ |
| 120 | public class FilesystemAsyncBlobStore extends BaseAsyncBlobStore { |
| 121 | |
| 122 | @Resource |
| 123 | protected Logger logger = Logger.NULL; |
| 124 | |
| 125 | protected final DateService dateService; |
| 126 | protected final Crypto crypto; |
| 127 | protected final HttpGetOptionsListToGetOptions httpGetOptionsConverter; |
| 128 | protected final IfDirectoryReturnNameStrategy ifDirectoryReturnName; |
| 129 | protected final Factory blobFactory; |
| 130 | protected final FilesystemStorageStrategy storageStrategy; |
| 131 | |
| 132 | @Inject |
| 133 | protected FilesystemAsyncBlobStore(BlobStoreContext context, DateService dateService, Crypto crypto, |
| 134 | HttpGetOptionsListToGetOptions httpGetOptionsConverter, |
| 135 | IfDirectoryReturnNameStrategy ifDirectoryReturnName, Factory blobFactory, BlobUtils blobUtils, |
| 136 | @Named(Constants.PROPERTY_USER_THREADS) ExecutorService service, Supplier<Location> defaultLocation, |
| 137 | @Memoized Supplier<Set<? extends Location>> locations, FilesystemStorageStrategy storageStrategy) { |
| 138 | super(context, blobUtils, service, defaultLocation, locations); |
| 139 | // super(context, blobUtils, service, null, null); |
| 140 | this.blobFactory = blobFactory; |
| 141 | this.dateService = dateService; |
| 142 | this.crypto = crypto; |
| 143 | this.httpGetOptionsConverter = httpGetOptionsConverter; |
| 144 | this.ifDirectoryReturnName = ifDirectoryReturnName; |
| 145 | this.storageStrategy = checkNotNull(storageStrategy, "Storage strategy"); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * default maxResults is 1000 |
| 150 | */ |
| 151 | @Override |
| 152 | public ListenableFuture<PageSet<? extends StorageMetadata>> list(final String container, ListContainerOptions options) { |
| 153 | |
| 154 | // Check if the container exists |
| 155 | if (!containerExistsSyncImpl(container)) { |
| 156 | return immediateFailedFuture(cnfe(container)); |
| 157 | } |
| 158 | |
| 159 | // Loading blobs from container |
| 160 | Iterable<String> blobBelongingToContainer = null; |
| 161 | try { |
| 162 | blobBelongingToContainer = storageStrategy.getBlobKeysInsideContainer(container); |
| 163 | } catch (IOException e) { |
| 164 | logger.error(e, "An error occurred loading blobs contained into container %s", container); |
| 165 | Throwables.propagate(e); |
| 166 | } |
| 167 | |
| 168 | SortedSet<StorageMetadata> contents = newTreeSet(transform(blobBelongingToContainer, |
| 169 | new Function<String, StorageMetadata>() { |
| 170 | public StorageMetadata apply(String key) { |
| 171 | Blob oldBlob = loadFileBlob(container, key); |
| 172 | |
| 173 | checkState(oldBlob != null, "blob " + key + " is not present although it was in the list of " |
| 174 | + container); |
| 175 | checkState(oldBlob.getMetadata() != null, "blob " + container + "/" + key + " has no metadata"); |
| 176 | MutableBlobMetadata md = copy(oldBlob.getMetadata()); |
| 177 | String directoryName = ifDirectoryReturnName.execute(md); |
| 178 | if (directoryName != null) { |
| 179 | md.setName(directoryName); |
| 180 | md.setType(StorageType.RELATIVE_PATH); |
| 181 | } |
| 182 | return md; |
| 183 | } |
| 184 | })); |
| 185 | |
| 186 | String marker = null; |
| 187 | if (options != null) { |
| 188 | if (options.getMarker() != null) { |
| 189 | final String finalMarker = options.getMarker(); |
| 190 | StorageMetadata lastMarkerMetadata = find(contents, new Predicate<StorageMetadata>() { |
| 191 | public boolean apply(StorageMetadata metadata) { |
| 192 | return metadata.getName().equals(finalMarker); |
| 193 | } |
| 194 | }); |
| 195 | contents = contents.tailSet(lastMarkerMetadata); |
| 196 | contents.remove(lastMarkerMetadata); |
| 197 | } |
| 198 | |
| 199 | final String prefix = options.getDir(); |
| 200 | if (prefix != null) { |
| 201 | contents = newTreeSet(filter(contents, new Predicate<StorageMetadata>() { |
| 202 | public boolean apply(StorageMetadata o) { |
| 203 | return (o != null && o.getName().startsWith(prefix) && !o.getName().equals(prefix)); |
| 204 | } |
| 205 | })); |
| 206 | } |
| 207 | |
| 208 | Integer maxResults = options.getMaxResults() != null ? options.getMaxResults() : 1000; |
| 209 | if (contents.size() > 0) { |
| 210 | SortedSet<StorageMetadata> contentsSlice = firstSliceOfSize(contents, maxResults); |
| 211 | if (!contentsSlice.contains(contents.last())) { |
| 212 | // Partial listing |
| 213 | marker = contentsSlice.last().getName(); |
| 214 | } else { |
| 215 | marker = null; |
| 216 | } |
| 217 | contents = contentsSlice; |
| 218 | } |
| 219 | |
| 220 | final String delimiter = options.isRecursive() ? null : File.separator; |
| 221 | if (delimiter != null) { |
| 222 | SortedSet<String> commonPrefixes = null; |
| 223 | Iterable<String> iterable = transform(contents, new CommonPrefixes(prefix != null ? prefix : null, |
| 224 | delimiter)); |
| 225 | commonPrefixes = iterable != null ? newTreeSet(iterable) : new TreeSet<String>(); |
| 226 | commonPrefixes.remove(CommonPrefixes.NO_PREFIX); |
| 227 | |
| 228 | contents = newTreeSet(filter(contents, new DelimiterFilter(prefix != null ? prefix : null, delimiter))); |
| 229 | |
| 230 | Iterables.<StorageMetadata> addAll(contents, transform(commonPrefixes, |
| 231 | new Function<String, StorageMetadata>() { |
| 232 | public StorageMetadata apply(String o) { |
| 233 | MutableStorageMetadata md = new MutableStorageMetadataImpl(); |
| 234 | md.setType(StorageType.RELATIVE_PATH); |
| 235 | md.setName(o); |
| 236 | return md; |
| 237 | } |
| 238 | })); |
| 239 | } |
| 240 | |
| 241 | // trim metadata, if the response isn't supposed to be detailed. |
| 242 | if (!options.isDetailed()) { |
| 243 | for (StorageMetadata md : contents) { |
| 244 | md.getUserMetadata().clear(); |
| 245 | } |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | return Futures.<PageSet<? extends StorageMetadata>> immediateFuture(new PageSetImpl<StorageMetadata>(contents, |
| 250 | marker)); |
| 251 | |
| 252 | } |
| 253 | |
| 254 | private ContainerNotFoundException cnfe(final String name) { |
| 255 | return new ContainerNotFoundException(name, String.format("container %s not in filesystem", name)); |
| 256 | } |
| 257 | |
| 258 | public static MutableBlobMetadata copy(MutableBlobMetadata in) { |
| 259 | ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| 260 | ObjectOutput os; |
| 261 | try { |
| 262 | os = new ObjectOutputStream(bout); |
| 263 | os.writeObject(in); |
| 264 | ObjectInput is = new ObjectInputStream(new ByteArrayInputStream(bout.toByteArray())); |
| 265 | MutableBlobMetadata metadata = (MutableBlobMetadata) is.readObject(); |
| 266 | convertUserMetadataKeysToLowercase(metadata); |
| 267 | metadata.setContentMetadata(BaseMutableContentMetadata.fromContentMetadata(in.getContentMetadata().toBuilder() |
| 268 | .build())); |
| 269 | return metadata; |
| 270 | } catch (Exception e) { |
| 271 | propagate(e); |
| 272 | assert false : "exception should have propagated: " + e; |
| 273 | return null; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | private static void convertUserMetadataKeysToLowercase(MutableBlobMetadata metadata) { |
| 278 | Map<String, String> lowerCaseUserMetadata = newHashMap(); |
| 279 | for (Entry<String, String> entry : metadata.getUserMetadata().entrySet()) { |
| 280 | lowerCaseUserMetadata.put(entry.getKey().toLowerCase(), entry.getValue()); |
| 281 | } |
| 282 | metadata.setUserMetadata(lowerCaseUserMetadata); |
| 283 | } |
| 284 | |
| 285 | public static MutableBlobMetadata copy(MutableBlobMetadata in, String newKey) { |
| 286 | MutableBlobMetadata newMd = copy(in); |
| 287 | newMd.setName(newKey); |
| 288 | return newMd; |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * {@inheritDoc} |
| 293 | */ |
| 294 | @Override |
| 295 | public ListenableFuture<Void> removeBlob(final String container, final String key) { |
| 296 | storageStrategy.removeBlob(container, key); |
| 297 | return immediateFuture(null); |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * {@inheritDoc} |
| 302 | */ |
| 303 | @Override |
| 304 | public ListenableFuture<Boolean> containerExists(final String containerName) { |
| 305 | boolean exists = containerExistsSyncImpl(containerName); |
| 306 | return immediateFuture(exists); |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * {@inheritDoc} |
| 311 | */ |
| 312 | @Override |
| 313 | public ListenableFuture<PageSet<? extends StorageMetadata>> list() { |
| 314 | Iterable<String> containers = storageStrategy.getAllContainerNames(); |
| 315 | |
| 316 | return Futures.<PageSet<? extends StorageMetadata>> immediateFuture(new PageSetImpl<StorageMetadata>(transform( |
| 317 | containers, new Function<String, StorageMetadata>() { |
| 318 | public StorageMetadata apply(String name) { |
| 319 | MutableStorageMetadata cmd = create(); |
| 320 | cmd.setName(name); |
| 321 | cmd.setType(StorageType.CONTAINER); |
| 322 | return cmd; |
| 323 | } |
| 324 | }), null)); |
| 325 | } |
| 326 | |
| 327 | protected MutableStorageMetadata create() { |
| 328 | return new MutableStorageMetadataImpl(); |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * {@inheritDoc} |
| 333 | */ |
| 334 | @Path("{container}") |
| 335 | @Override |
| 336 | public ListenableFuture<Boolean> createContainerInLocation(final Location location, |
| 337 | @PathParam("container") @ParamValidators( { FilesystemContainerNameValidator.class }) String name) { |
| 338 | boolean result = storageStrategy.createContainer(name); |
| 339 | return immediateFuture(result); |
| 340 | } |
| 341 | |
| 342 | public String getFirstQueryOrNull(String string, @Nullable HttpRequestOptions options) { |
| 343 | if (options == null) |
| 344 | return null; |
| 345 | Collection<String> values = options.buildQueryParameters().get(string); |
| 346 | return (values != null && values.size() >= 1) ? values.iterator().next() : null; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Load the blob with the given key belonging to the container with the given name. There must |
| 351 | * exist a resource on the file system whose complete name is given concatenating the container |
| 352 | * name and the key |
| 353 | * |
| 354 | * @param container |
| 355 | * it's the name of the container the blob belongs to |
| 356 | * @param key |
| 357 | * it's the key of the blob |
| 358 | * |
| 359 | * @return the blob belonging to the given container with the given key |
| 360 | */ |
| 361 | private Blob loadFileBlob(final String container, final String key) { |
| 362 | logger.debug("Opening blob in container: %s - %s", container, key); |
| 363 | File blobPayload = storageStrategy.getFileForBlobKey(container, key); |
| 364 | |
| 365 | Payload payload = new FilePayload(blobPayload); |
| 366 | // Loading object metadata |
| 367 | MutableBlobMetadata metadata = new MutableBlobMetadataImpl(); |
| 368 | metadata.setName(key); |
| 369 | metadata.setLastModified(new Date(blobPayload.lastModified())); |
| 370 | metadata.getContentMetadata().setContentLength(blobPayload.length()); |
| 371 | // TODO What about the MD5? are we supposed to calculate it each time we load |
| 372 | // the file? |
| 373 | try { |
| 374 | payload = Payloads.calculateMD5(payload); |
| 375 | } catch (IOException e) { |
| 376 | logger.error("An error occurred calculating MD5 for blob %s from container ", key, container); |
| 377 | Throwables.propagateIfPossible(e); |
| 378 | } |
| 379 | metadata.getContentMetadata().setContentType(""); |
| 380 | String eTag = CryptoStreams.hex(payload.getContentMetadata().getContentMD5()); |
| 381 | metadata.setETag(eTag); |
| 382 | // Creating new blob object |
| 383 | Blob blob = blobFactory.create(metadata); |
| 384 | blob.setPayload(blobPayload); |
| 385 | return blob; |
| 386 | } |
| 387 | |
| 388 | protected static class DelimiterFilter implements Predicate<StorageMetadata> { |
| 389 | private final String prefix; |
| 390 | private final String delimiter; |
| 391 | |
| 392 | public DelimiterFilter(String prefix, String delimiter) { |
| 393 | this.prefix = prefix; |
| 394 | this.delimiter = delimiter; |
| 395 | } |
| 396 | |
| 397 | public boolean apply(StorageMetadata metadata) { |
| 398 | if (prefix == null) |
| 399 | return metadata.getName().indexOf(delimiter) == -1; |
| 400 | // ensure we don't accidentally append twice |
| 401 | String toMatch = prefix.endsWith("/") ? prefix : prefix + delimiter; |
| 402 | if (metadata.getName().startsWith(toMatch)) { |
| 403 | String unprefixedName = metadata.getName().replaceFirst(toMatch, ""); |
| 404 | if (unprefixedName.equals("")) { |
| 405 | // we are the prefix in this case, return false |
| 406 | return false; |
| 407 | } |
| 408 | return unprefixedName.indexOf(delimiter) == -1; |
| 409 | } |
| 410 | return false; |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | protected static class CommonPrefixes implements Function<StorageMetadata, String> { |
| 415 | private final String prefix; |
| 416 | private final String delimiter; |
| 417 | public static final String NO_PREFIX = "NO_PREFIX"; |
| 418 | |
| 419 | public CommonPrefixes(String prefix, String delimiter) { |
| 420 | this.prefix = prefix; |
| 421 | this.delimiter = delimiter; |
| 422 | } |
| 423 | |
| 424 | public String apply(StorageMetadata metadata) { |
| 425 | String working = metadata.getName(); |
| 426 | if (prefix != null) { |
| 427 | // ensure we don't accidentally append twice |
| 428 | String toMatch = prefix.endsWith("/") ? prefix : prefix + delimiter; |
| 429 | if (working.startsWith(toMatch)) { |
| 430 | working = working.replaceFirst(toMatch, ""); |
| 431 | } |
| 432 | } |
| 433 | if (working.contains(delimiter)) { |
| 434 | return working.substring(0, working.indexOf(delimiter)); |
| 435 | } |
| 436 | return NO_PREFIX; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | public static <T extends Comparable<?>> SortedSet<T> firstSliceOfSize(Iterable<T> elements, int size) { |
| 441 | List<List<T>> slices = partition(newArrayList(elements), size); |
| 442 | return newTreeSet(slices.get(0)); |
| 443 | } |
| 444 | |
| 445 | public static HttpResponseException returnResponseException(int code) { |
| 446 | HttpResponse response = null; |
| 447 | response = new HttpResponse(code, null, null); |
| 448 | return new HttpResponseException(new HttpCommand() { |
| 449 | |
| 450 | public int getRedirectCount() { |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | public int incrementRedirectCount() { |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | public boolean isReplayable() { |
| 459 | return false; |
| 460 | } |
| 461 | |
| 462 | public Exception getException() { |
| 463 | return null; |
| 464 | } |
| 465 | |
| 466 | public int getFailureCount() { |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | public int incrementFailureCount() { |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | public void setException(Exception exception) { |
| 475 | |
| 476 | } |
| 477 | |
| 478 | @Override |
| 479 | public HttpRequest getCurrentRequest() { |
| 480 | return new HttpRequest("GET", URI.create("http://stub")); |
| 481 | } |
| 482 | |
| 483 | @Override |
| 484 | public void setCurrentRequest(HttpRequest request) { |
| 485 | |
| 486 | } |
| 487 | |
| 488 | }, response); |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | * {@inheritDoc} |
| 493 | */ |
| 494 | @Override |
| 495 | public ListenableFuture<String> putBlob(String containerName, Blob object) { |
| 496 | String blobKey = object.getMetadata().getName(); |
| 497 | |
| 498 | logger.debug("Put object with key [%s] to container [%s]", blobKey, containerName); |
| 499 | String eTag = getEtag(object); |
| 500 | try { |
| 501 | // TODO |
| 502 | // must override existing file? |
| 503 | |
| 504 | storageStrategy.writePayloadOnFile(containerName, blobKey, object.getPayload()); |
| 505 | } catch (IOException e) { |
| 506 | logger.error(e, "An error occurred storing the new object with name [%s] to container [%s].", blobKey, |
| 507 | containerName); |
| 508 | Throwables.propagate(e); |
| 509 | } |
| 510 | return immediateFuture(eTag); |
| 511 | } |
| 512 | |
| 513 | /** |
| 514 | * {@inheritDoc} |
| 515 | */ |
| 516 | @Override |
| 517 | public ListenableFuture<Boolean> blobExists(final String containerName, final String key) { |
| 518 | return immediateFuture(storageStrategy.blobExists(containerName, key)); |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * {@inheritDoc} |
| 523 | */ |
| 524 | @Override |
| 525 | public ListenableFuture<Blob> getBlob(final String containerName, final String key, GetOptions options) { |
| 526 | logger.debug("Retrieving blob with key %s from container %s", key, containerName); |
| 527 | // If the container doesn't exist, an exception is thrown |
| 528 | if (!containerExistsSyncImpl(containerName)) { |
| 529 | logger.debug("Container %s does not exist", containerName); |
| 530 | return immediateFailedFuture(cnfe(containerName)); |
| 531 | } |
| 532 | // If the blob doesn't exist, a null object is returned |
| 533 | if (!storageStrategy.blobExists(containerName, key)) { |
| 534 | logger.debug("Item %s does not exist in container %s", key, containerName); |
| 535 | return immediateFuture(null); |
| 536 | } |
| 537 | |
| 538 | Blob blob = loadFileBlob(containerName, key); |
| 539 | |
| 540 | if (options != null) { |
| 541 | if (options.getIfMatch() != null) { |
| 542 | if (!blob.getMetadata().getETag().equals(options.getIfMatch())) |
| 543 | return immediateFailedFuture(returnResponseException(412)); |
| 544 | } |
| 545 | if (options.getIfNoneMatch() != null) { |
| 546 | if (blob.getMetadata().getETag().equals(options.getIfNoneMatch())) |
| 547 | return immediateFailedFuture(returnResponseException(304)); |
| 548 | } |
| 549 | if (options.getIfModifiedSince() != null) { |
| 550 | Date modifiedSince = options.getIfModifiedSince(); |
| 551 | if (blob.getMetadata().getLastModified().before(modifiedSince)) { |
| 552 | HttpResponse response = new HttpResponse(304, null, null); |
| 553 | return immediateFailedFuture(new HttpResponseException(String.format("%1$s is before %2$s", blob |
| 554 | .getMetadata().getLastModified(), modifiedSince), null, response)); |
| 555 | } |
| 556 | |
| 557 | } |
| 558 | if (options.getIfUnmodifiedSince() != null) { |
| 559 | Date unmodifiedSince = options.getIfUnmodifiedSince(); |
| 560 | if (blob.getMetadata().getLastModified().after(unmodifiedSince)) { |
| 561 | HttpResponse response = new HttpResponse(412, null, null); |
| 562 | return immediateFailedFuture(new HttpResponseException(String.format("%1$s is after %2$s", blob |
| 563 | .getMetadata().getLastModified(), unmodifiedSince), null, response)); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | if (options.getRanges() != null && options.getRanges().size() > 0) { |
| 568 | byte[] data; |
| 569 | try { |
| 570 | data = toByteArray(blob.getPayload().getInput()); |
| 571 | } catch (IOException e) { |
| 572 | return immediateFailedFuture(new RuntimeException(e)); |
| 573 | } |
| 574 | ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| 575 | for (String s : options.getRanges()) { |
| 576 | if (s.startsWith("-")) { |
| 577 | int length = Integer.parseInt(s.substring(1)); |
| 578 | out.write(data, data.length - length, length); |
| 579 | } else if (s.endsWith("-")) { |
| 580 | int offset = Integer.parseInt(s.substring(0, s.length() - 1)); |
| 581 | out.write(data, offset, data.length - offset); |
| 582 | } else if (s.contains("-")) { |
| 583 | String[] firstLast = s.split("\\-"); |
| 584 | int offset = Integer.parseInt(firstLast[0]); |
| 585 | int last = Integer.parseInt(firstLast[1]); |
| 586 | int length = (last < data.length) ? last + 1 : data.length - offset; |
| 587 | out.write(data, offset, length); |
| 588 | } else { |
| 589 | return immediateFailedFuture(new IllegalArgumentException("first and last were null!")); |
| 590 | } |
| 591 | |
| 592 | } |
| 593 | blob.setPayload(out.toByteArray()); |
| 594 | blob.getMetadata().getContentMetadata().setContentLength(new Long(data.length)); |
| 595 | } |
| 596 | } |
| 597 | checkNotNull(blob.getPayload(), "payload " + blob); |
| 598 | return immediateFuture(blob); |
| 599 | } |
| 600 | |
| 601 | /** |
| 602 | * {@inheritDoc} |
| 603 | */ |
| 604 | @Override |
| 605 | public ListenableFuture<BlobMetadata> blobMetadata(final String container, final String key) { |
| 606 | try { |
| 607 | Blob blob = getBlob(container, key).get(); |
| 608 | return immediateFuture(blob != null ? (BlobMetadata) copy(blob.getMetadata()) : null); |
| 609 | } catch (Exception e) { |
| 610 | if (size(filter(getCausalChain(e), KeyNotFoundException.class)) >= 1) |
| 611 | return immediateFuture(null); |
| 612 | return immediateFailedFuture(e); |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | @Override |
| 617 | protected boolean deleteAndVerifyContainerGone(String container) { |
| 618 | storageStrategy.deleteContainer(container); |
| 619 | return containerExistsSyncImpl(container); |
| 620 | } |
| 621 | |
| 622 | /** |
| 623 | * Override parent method because it uses strange futures and listenables that creates problem in |
| 624 | * the test if more than one test that deletes the container is executed |
| 625 | * |
| 626 | * @param container |
| 627 | * @return |
| 628 | */ |
| 629 | @Override |
| 630 | public ListenableFuture<Void> deleteContainer(String container) { |
| 631 | deleteAndVerifyContainerGone(container); |
| 632 | return immediateFuture(null); |
| 633 | } |
| 634 | |
| 635 | /** |
| 636 | * Each container is a directory, so in order to check if a container exists the corresponding |
| 637 | * directory must exists. Synchronous implementation |
| 638 | * |
| 639 | * @param containerName |
| 640 | * @return |
| 641 | */ |
| 642 | private boolean containerExistsSyncImpl(String containerName) { |
| 643 | return storageStrategy.containerExists(containerName); |
| 644 | } |
| 645 | |
| 646 | /** |
| 647 | * |
| 648 | * Calculates the object MD5 and returns it as eTag |
| 649 | * |
| 650 | * @param object |
| 651 | * @return |
| 652 | */ |
| 653 | private String getEtag(Blob object) { |
| 654 | try { |
| 655 | Payloads.calculateMD5(object, crypto.md5()); |
| 656 | } catch (IOException ex) { |
| 657 | logger.error(ex, "An error occurred calculating MD5 for object with name %s.", object.getMetadata().getName()); |
| 658 | Throwables.propagate(ex); |
| 659 | } |
| 660 | |
| 661 | String eTag = CryptoStreams.hex(object.getPayload().getContentMetadata().getContentMD5()); |
| 662 | return eTag; |
| 663 | } |
| 664 | |
| 665 | @Override |
| 666 | public ListenableFuture<String> putBlob(String container, Blob blob, PutOptions options) { |
| 667 | // TODO implement options |
| 668 | return putBlob(container, blob); |
| 669 | } |
| 670 | |
| 671 | @Override |
| 672 | public ListenableFuture<Boolean> createContainerInLocation(Location location, String container, |
| 673 | CreateContainerOptions options) { |
| 674 | if (options.isPublicRead()) |
| 675 | throw new UnsupportedOperationException("publicRead"); |
| 676 | return createContainerInLocation(location, container); |
| 677 | } |
| 678 | } |