[Backport 2.11] Fix error handling for future completion

plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3BlobContainer.java

@@ -241,23 +241,27 @@ public void readBlobAsync(String blobName, ActionListener<ReadContext> listener)
                     return;
                 }
 
-                final List<ReadContext.StreamPartCreator> blobPartInputStreamFutures = new ArrayList<>();
-                final long blobSize = blobMetadata.objectSize();
-                final Integer numberOfParts = blobMetadata.objectParts() == null ? null : blobMetadata.objectParts().totalPartsCount();
-                final String blobChecksum = blobMetadata.checksum().checksumCRC32();
-
-                if (numberOfParts == null) {
-                    blobPartInputStreamFutures.add(() -> getBlobPartInputStreamContainer(s3AsyncClient, bucketName, blobKey, null));
-                } else {
-                    // S3 multipart files use 1 to n indexing
-                    for (int partNumber = 1; partNumber <= numberOfParts; partNumber++) {
-                        final int innerPartNumber = partNumber;
-                        blobPartInputStreamFutures.add(
-                            () -> getBlobPartInputStreamContainer(s3AsyncClient, bucketName, blobKey, innerPartNumber)
-                        );
+                try {
+                    final List<ReadContext.StreamPartCreator> blobPartInputStreamFutures = new ArrayList<>();
+                    final long blobSize = blobMetadata.objectSize();
+                    final Integer numberOfParts = blobMetadata.objectParts() == null ? null : blobMetadata.objectParts().totalPartsCount();
+                    final String blobChecksum = blobMetadata.checksum() == null ? null : blobMetadata.checksum().checksumCRC32();
+
+                    if (numberOfParts == null) {
+                        blobPartInputStreamFutures.add(() -> getBlobPartInputStreamContainer(s3AsyncClient, bucketName, blobKey, null));
+                    } else {
+                        // S3 multipart files use 1 to n indexing
+                        for (int partNumber = 1; partNumber <= numberOfParts; partNumber++) {
+                            final int innerPartNumber = partNumber;
+                            blobPartInputStreamFutures.add(
+                                () -> getBlobPartInputStreamContainer(s3AsyncClient, bucketName, blobKey, innerPartNumber)
+                            );
+                        }
                     }
+                    listener.onResponse(new ReadContext(blobSize, blobPartInputStreamFutures, blobChecksum));
+                } catch (Exception ex) {
+                    listener.onFailure(ex);
                 }
-                listener.onResponse(new ReadContext(blobSize, blobPartInputStreamFutures, blobChecksum));
             });
         } catch (Exception ex) {
             listener.onFailure(SdkException.create("Error occurred while fetching blob parts from the repository", ex));

plugins/repository-s3/src/test/java/org/opensearch/repositories/s3/S3BlobStoreContainerTests.java

@@ -1074,6 +1074,51 @@ public void testReadBlobAsyncFailure() throws Exception {
         assertEquals(1, readContextActionListener.getFailureCount());
     }
 
+    public void testReadBlobAsyncOnCompleteFailureMissingData() throws Exception {
+        final String bucketName = randomAlphaOfLengthBetween(1, 10);
+        final String blobName = randomAlphaOfLengthBetween(1, 10);
+        final String checksum = randomAlphaOfLength(10);
+
+        final long objectSize = 100L;
+        final int objectPartCount = 10;
+
+        final S3AsyncClient s3AsyncClient = mock(S3AsyncClient.class);
+        final AmazonAsyncS3Reference amazonAsyncS3Reference = new AmazonAsyncS3Reference(
+            AmazonAsyncS3WithCredentials.create(s3AsyncClient, s3AsyncClient, null)
+        );
+
+        final S3BlobStore blobStore = mock(S3BlobStore.class);
+        final BlobPath blobPath = new BlobPath();
+
+        when(blobStore.bucket()).thenReturn(bucketName);
+        when(blobStore.getStatsMetricPublisher()).thenReturn(new StatsMetricPublisher());
+        when(blobStore.serverSideEncryption()).thenReturn(false);
+        when(blobStore.asyncClientReference()).thenReturn(amazonAsyncS3Reference);
+
+        CompletableFuture<GetObjectAttributesResponse> getObjectAttributesResponseCompletableFuture = new CompletableFuture<>();
+        getObjectAttributesResponseCompletableFuture.complete(
+            GetObjectAttributesResponse.builder()
+                .checksum(Checksum.builder().build())
+                .objectSize(null)
+                .objectParts(GetObjectAttributesParts.builder().totalPartsCount(objectPartCount).build())
+                .build()
+        );
+        when(s3AsyncClient.getObjectAttributes(any(GetObjectAttributesRequest.class))).thenReturn(
+            getObjectAttributesResponseCompletableFuture
+        );
+
+        CountDownLatch countDownLatch = new CountDownLatch(1);
+        CountingCompletionListener<ReadContext> readContextActionListener = new CountingCompletionListener<>();
+        LatchedActionListener<ReadContext> listener = new LatchedActionListener<>(readContextActionListener, countDownLatch);
+
+        final S3BlobContainer blobContainer = new S3BlobContainer(blobPath, blobStore);
+        blobContainer.readBlobAsync(blobName, listener);
+        countDownLatch.await();
+
+        assertEquals(0, readContextActionListener.getResponseCount());
+        assertEquals(1, readContextActionListener.getFailureCount());
+    }
+
     public void testGetBlobMetadata() throws Exception {
         final String checksum = randomAlphaOfLengthBetween(1, 10);
         final long objectSize = 100L;