feat: allow specifying an expected object size for resumable operations.

Update resumable upload failure detection to be more specific about classifying a request as SCENARIO_5 Fixes #2511
googleapis · Aug 6, 2024 · b85b4fc · b85b4fc
1 parent 48e7a4c
commit b85b4fc
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diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/BidiBlobWriteSessionConfig.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/BidiBlobWriteSessionConfig.java
@@ -114,7 +114,7 @@ public WritableByteChannelSession<?, BlobInfo> writeSession(
                       BidiWriteObjectRequest req = grpc.getBidiWriteObjectRequest(info, opts);
 
                       ApiFuture<BidiResumableWrite> startResumableWrite =
-                          grpc.startResumableWrite(grpcCallContext, req);
+                          grpc.startResumableWrite(grpcCallContext, req, opts);
                       return ResumableMedia.gapic()
                           .write()
                           .bidiByteChannel(grpc.storageClient.bidiWriteObjectCallable())

diff --git a/...e-cloud-storage/src/main/java/com/google/cloud/storage/DefaultBlobWriteSessionConfig.java b/...e-cloud-storage/src/main/java/com/google/cloud/storage/DefaultBlobWriteSessionConfig.java
@@ -156,7 +156,7 @@ public WritableByteChannelSession<?, BlobInfo> writeSession(
                       WriteObjectRequest req = grpc.getWriteObjectRequest(info, opts);
 
                       ApiFuture<ResumableWrite> startResumableWrite =
-                          grpc.startResumableWrite(grpcCallContext, req);
+                          grpc.startResumableWrite(grpcCallContext, req, opts);
                       return ResumableMedia.gapic()
                           .write()
                           .byteChannel(

diff --git a/...torage/src/main/java/com/google/cloud/storage/GapicBidiUnbufferedWritableByteChannel.java b/...torage/src/main/java/com/google/cloud/storage/GapicBidiUnbufferedWritableByteChannel.java
@@ -24,6 +24,7 @@
 import com.google.api.gax.rpc.ApiException;
 import com.google.api.gax.rpc.ApiStreamObserver;
 import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ErrorDetails;
 import com.google.api.gax.rpc.OutOfRangeException;
 import com.google.cloud.storage.ChunkSegmenter.ChunkSegment;
 import com.google.cloud.storage.Conversions.Decoder;
@@ -345,10 +346,17 @@ public void onNext(BidiWriteObjectResponse value) {
     public void onError(Throwable t) {
       if (t instanceof OutOfRangeException) {
         OutOfRangeException oore = (OutOfRangeException) t;
-        clientDetectedError(
-            ResumableSessionFailureScenario.SCENARIO_5.toStorageException(
-                ImmutableList.of(lastWrittenRequest), null, context, oore));
-      } else if (t instanceof ApiException) {
+        ErrorDetails ed = oore.getErrorDetails();
+        if (!(ed != null
+            && ed.getErrorInfo() != null
+            && ed.getErrorInfo().getReason().equals("GRPC_MISMATCHED_UPLOAD_SIZE"))) {
+          clientDetectedError(
+              ResumableSessionFailureScenario.SCENARIO_5.toStorageException(
+                  ImmutableList.of(lastWrittenRequest), null, context, oore));
+          return;
+        }
+      }
+      if (t instanceof ApiException) {
         // use StorageExceptions logic to translate from ApiException to our status codes ensuring
         // things fall in line with our retry handlers.
         // This is suboptimal, as it will initialize a second exception, however this is the

diff --git a/...ain/java/com/google/cloud/storage/GapicUnbufferedChunkedResumableWritableByteChannel.java b/...ain/java/com/google/cloud/storage/GapicUnbufferedChunkedResumableWritableByteChannel.java
@@ -24,6 +24,7 @@
 import com.google.api.gax.rpc.ApiException;
 import com.google.api.gax.rpc.ApiStreamObserver;
 import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.ErrorDetails;
 import com.google.api.gax.rpc.OutOfRangeException;
 import com.google.cloud.storage.ChunkSegmenter.ChunkSegment;
 import com.google.cloud.storage.Conversions.Decoder;
@@ -267,11 +268,18 @@ public void onError(Throwable t) {
       if (t instanceof OutOfRangeException) {
         OutOfRangeException oore = (OutOfRangeException) t;
         open = false;
-        StorageException storageException =
-            ResumableSessionFailureScenario.SCENARIO_5.toStorageException(
-                segments, null, context, oore);
-        invocationHandle.setException(storageException);
-      } else if (t instanceof ApiException) {
+        ErrorDetails ed = oore.getErrorDetails();
+        if (!(ed != null
+            && ed.getErrorInfo() != null
+            && ed.getErrorInfo().getReason().equals("GRPC_MISMATCHED_UPLOAD_SIZE"))) {
+          StorageException storageException =
+              ResumableSessionFailureScenario.SCENARIO_5.toStorageException(
+                  segments, null, context, oore);
+          invocationHandle.setException(storageException);
+          return;
+        }
+      }
+      if (t instanceof ApiException) {
         // use StorageExceptions logic to translate from ApiException to our status codes ensuring
         // things fall in line with our retry handlers.
         // This is suboptimal, as it will initialize a second exception, however this is the

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/GapicUploadSessionBuilder.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/GapicUploadSessionBuilder.java
@@ -21,6 +21,8 @@
 import com.google.api.gax.rpc.BidiStreamingCallable;
 import com.google.api.gax.rpc.ClientStreamingCallable;
 import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.storage.UnifiedOpts.ObjectTargetOpt;
+import com.google.cloud.storage.UnifiedOpts.Opts;
 import com.google.common.util.concurrent.MoreExecutors;
 import com.google.storage.v2.BidiWriteObjectRequest;
 import com.google.storage.v2.BidiWriteObjectResponse;
@@ -50,7 +52,8 @@ GapicBidiWritableByteChannelSessionBuilder bidiByteChannel(
 
   ApiFuture<ResumableWrite> resumableWrite(
       UnaryCallable<StartResumableWriteRequest, StartResumableWriteResponse> callable,
-      WriteObjectRequest writeObjectRequest) {
+      WriteObjectRequest writeObjectRequest,
+      Opts<ObjectTargetOpt> opts) {
     StartResumableWriteRequest.Builder b = StartResumableWriteRequest.newBuilder();
     if (writeObjectRequest.hasWriteObjectSpec()) {
       b.setWriteObjectSpec(writeObjectRequest.getWriteObjectSpec());
@@ -61,7 +64,7 @@ ApiFuture<ResumableWrite> resumableWrite(
     if (writeObjectRequest.hasObjectChecksums()) {
       b.setObjectChecksums(writeObjectRequest.getObjectChecksums());
     }
-    StartResumableWriteRequest req = b.build();
+    StartResumableWriteRequest req = opts.startResumableWriteRequest().apply(b).build();
     Function<String, WriteObjectRequest> f =
         uploadId ->
             writeObjectRequest.toBuilder().clearWriteObjectSpec().setUploadId(uploadId).build();
@@ -80,7 +83,8 @@ ApiFuture<ResumableWrite> resumableWrite(
 
   ApiFuture<BidiResumableWrite> bidiResumableWrite(
       UnaryCallable<StartResumableWriteRequest, StartResumableWriteResponse> x,
-      BidiWriteObjectRequest writeObjectRequest) {
+      BidiWriteObjectRequest writeObjectRequest,
+      Opts<ObjectTargetOpt> opts) {
     StartResumableWriteRequest.Builder b = StartResumableWriteRequest.newBuilder();
     if (writeObjectRequest.hasWriteObjectSpec()) {
       b.setWriteObjectSpec(writeObjectRequest.getWriteObjectSpec());
@@ -91,7 +95,7 @@ ApiFuture<BidiResumableWrite> bidiResumableWrite(
     if (writeObjectRequest.hasObjectChecksums()) {
       b.setObjectChecksums(writeObjectRequest.getObjectChecksums());
     }
-    StartResumableWriteRequest req = b.build();
+    StartResumableWriteRequest req = opts.startResumableWriteRequest().apply(b).build();
     Function<String, BidiWriteObjectRequest> f =
         uploadId ->
             writeObjectRequest.toBuilder().clearWriteObjectSpec().setUploadId(uploadId).build();

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageImpl.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageImpl.java
@@ -320,7 +320,7 @@ public Blob internalCreateFrom(Path path, BlobInfo info, Opts<ObjectTargetOpt> o
     ClientStreamingCallable<WriteObjectRequest, WriteObjectResponse> write =
         storageClient.writeObjectCallable().withDefaultCallContext(grpcCallContext);
 
-    ApiFuture<ResumableWrite> start = startResumableWrite(grpcCallContext, req);
+    ApiFuture<ResumableWrite> start = startResumableWrite(grpcCallContext, req, opts);
     ApiFuture<GrpcResumableSession> session2 =
         ApiFutures.transform(
             start,
@@ -365,7 +365,7 @@ public Blob createFrom(
         opts.grpcMetadataMapper().apply(GrpcCallContext.createDefault());
     WriteObjectRequest req = getWriteObjectRequest(blobInfo, opts);
 
-    ApiFuture<ResumableWrite> start = startResumableWrite(grpcCallContext, req);
+    ApiFuture<ResumableWrite> start = startResumableWrite(grpcCallContext, req, opts);
 
     BufferedWritableByteChannelSession<WriteObjectResponse> session =
         ResumableMedia.gapic()
@@ -790,7 +790,7 @@ public GrpcBlobWriteChannel writer(BlobInfo blobInfo, BlobWriteOption... options
     // in JSON, the starting of the resumable session happens before the invocation of write can
     // happen. Emulate the same thing here.
     //  1. create the future
-    ApiFuture<ResumableWrite> startResumableWrite = startResumableWrite(grpcCallContext, req);
+    ApiFuture<ResumableWrite> startResumableWrite = startResumableWrite(grpcCallContext, req, opts);
     //  2. await the result of the future
     ResumableWrite resumableWrite = ApiFutureUtils.await(startResumableWrite);
     //  3. wrap the result in another future container before constructing the BlobWriteChannel
@@ -1919,7 +1919,7 @@ private UnbufferedReadableByteChannelSession<Object> unbufferedReadSession(
 
   @VisibleForTesting
   ApiFuture<ResumableWrite> startResumableWrite(
-      GrpcCallContext grpcCallContext, WriteObjectRequest req) {
+      GrpcCallContext grpcCallContext, WriteObjectRequest req, Opts<ObjectTargetOpt> opts) {
     Set<StatusCode.Code> codes = resultRetryAlgorithmToCodes(retryAlgorithmManager.getFor(req));
     GrpcCallContext merge = Utils.merge(grpcCallContext, Retrying.newCallContext());
     return ResumableMedia.gapic()
@@ -1928,11 +1928,12 @@ ApiFuture<ResumableWrite> startResumableWrite(
             storageClient
                 .startResumableWriteCallable()
                 .withDefaultCallContext(merge.withRetryableCodes(codes)),
-            req);
+            req,
+            opts);
   }
 
   ApiFuture<BidiResumableWrite> startResumableWrite(
-      GrpcCallContext grpcCallContext, BidiWriteObjectRequest req) {
+      GrpcCallContext grpcCallContext, BidiWriteObjectRequest req, Opts<ObjectTargetOpt> opts) {
     Set<StatusCode.Code> codes = resultRetryAlgorithmToCodes(retryAlgorithmManager.getFor(req));
     GrpcCallContext merge = Utils.merge(grpcCallContext, Retrying.newCallContext());
     return ResumableMedia.gapic()
@@ -1941,7 +1942,8 @@ ApiFuture<BidiResumableWrite> startResumableWrite(
             storageClient
                 .startResumableWriteCallable()
                 .withDefaultCallContext(merge.withRetryableCodes(codes)),
-            req);
+            req,
+            opts);
   }
 
   private SourceObject sourceObjectEncode(SourceBlob from) {

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java
@@ -279,7 +279,8 @@ private Tuple<StorageSettings, Opts<UserProject>> resolveSettingsAndOpts() throw
         InstantiatingGrpcChannelProvider.newBuilder()
             .setEndpoint(endpoint)
             .setAllowNonDefaultServiceAccount(true)
-            .setAttemptDirectPath(attemptDirectPath);
+            .setAttemptDirectPath(attemptDirectPath)
+            .setMaxInboundMetadataSize(50 * 1024);
 
     if (!NoopGrpcInterceptorProvider.INSTANCE.equals(grpcInterceptorProvider)) {
       channelProviderBuilder.setInterceptorProvider(grpcInterceptorProvider);

diff --git a/...loud-storage/src/main/java/com/google/cloud/storage/JournalingBlobWriteSessionConfig.java b/...loud-storage/src/main/java/com/google/cloud/storage/JournalingBlobWriteSessionConfig.java
@@ -190,7 +190,7 @@ public WritableByteChannelSession<?, BlobInfo> writeSession(
             opts.grpcMetadataMapper().apply(GrpcCallContext.createDefault());
         ApiFuture<ResumableWrite> f =
             grpcStorage.startResumableWrite(
-                grpcCallContext, grpcStorage.getWriteObjectRequest(info, opts));
+                grpcCallContext, grpcStorage.getWriteObjectRequest(info, opts), opts);
         ApiFuture<WriteCtx<ResumableWrite>> start =
             ApiFutures.transform(f, WriteCtx::new, MoreExecutors.directExecutor());
 

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/JsonResumableSessionPutTask.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/JsonResumableSessionPutTask.java
@@ -205,7 +205,8 @@ public void rewindTo(long offset) {
             && contentLength != null
             && contentLength > 0) {
           String errorMessage = cause.getContent().toLowerCase(Locale.US);
-          if (errorMessage.contains("content-range")) {
+          if (errorMessage.contains("content-range")
+              && !errorMessage.contains("earlier")) { // TODO: exclude "earlier request"
             StorageException se =
                 ResumableSessionFailureScenario.SCENARIO_5.toStorageException(
                     uploadId, response, cause, cause::getContent);

diff --git a/...ge/src/main/java/com/google/cloud/storage/ParallelCompositeUploadWritableByteChannel.java b/...ge/src/main/java/com/google/cloud/storage/ParallelCompositeUploadWritableByteChannel.java
@@ -43,6 +43,7 @@
 import com.google.cloud.storage.UnifiedOpts.ObjectSourceOpt;
 import com.google.cloud.storage.UnifiedOpts.ObjectTargetOpt;
 import com.google.cloud.storage.UnifiedOpts.Opts;
+import com.google.cloud.storage.UnifiedOpts.ResumableUploadExpectedObjectSize;
 import com.google.cloud.storage.UnifiedOpts.SourceGenerationMatch;
 import com.google.cloud.storage.UnifiedOpts.SourceGenerationNotMatch;
 import com.google.cloud.storage.UnifiedOpts.SourceMetagenerationMatch;
@@ -102,7 +103,8 @@ final class ParallelCompositeUploadWritableByteChannel implements BufferedWritab
                 || o instanceof SourceMetagenerationMatch
                 || o instanceof SourceMetagenerationNotMatch
                 || o instanceof Crc32cMatch
-                || o instanceof Md5Match;
+                || o instanceof Md5Match
+                || o instanceof ResumableUploadExpectedObjectSize;
     TO_EXCLUDE_FROM_PARTS = tmp.negate();
   }
 

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/Storage.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/Storage.java
@@ -1273,6 +1273,23 @@ public static BlobWriteOption detectContentType() {
       return new BlobWriteOption(UnifiedOpts.detectContentType());
     }
 
+    /**
+     * Set a precondition on the number of bytes that GCS should expect for a resumable upload. See
+     * the docs for <a
+     * href="https://cloud.google.com/storage/docs/json_api/v1/parameters#xuploadcontentlength">X-Upload-Content-Length</a>
+     * for more detail.
+     *
+     * <p>If the method invoked with this option does not perform a resumable upload, this option
+     * will be ignored.
+     *
+     * @since 2.42.0
+     */
+    @BetaApi
+    @TransportCompatibility({Transport.HTTP, Transport.GRPC})
+    public static BlobWriteOption expectedObjectSize(long objectContentSize) {
+      return new BlobWriteOption(UnifiedOpts.resumableUploadExpectedObjectSize(objectContentSize));
+    }
+
     /**
      * Deduplicate any options which are the same parameter. The value which comes last in {@code
      * os} will be the value included in the return.

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/UnifiedOpts.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/UnifiedOpts.java
@@ -55,6 +55,7 @@
 import com.google.storage.v2.ReadObjectRequest;
 import com.google.storage.v2.RestoreObjectRequest;
 import com.google.storage.v2.RewriteObjectRequest;
+import com.google.storage.v2.StartResumableWriteRequest;
 import com.google.storage.v2.UpdateBucketRequest;
 import com.google.storage.v2.UpdateHmacKeyRequest;
 import com.google.storage.v2.UpdateObjectRequest;
@@ -196,6 +197,10 @@ default Mapper<ComposeObjectRequest.Builder> composeObject() {
     default Mapper<RewriteObjectRequest.Builder> rewriteObject() {
       return Mapper.identity();
     }
+
+    default Mapper<StartResumableWriteRequest.Builder> startResumableWrite() {
+      return Mapper.identity();
+    }
   }
 
   /** Base interface for those Opts which are applicable to Bucket List operations */
@@ -487,6 +492,12 @@ static Projection projection(@NonNull String projection) {
     return new Projection(projection);
   }
 
+  static ResumableUploadExpectedObjectSize resumableUploadExpectedObjectSize(
+      long expectedObjectSize) {
+    checkArgument(expectedObjectSize >= 0, "expectedObjectSize >= 0 (%s >= 0)", expectedObjectSize);
+    return new ResumableUploadExpectedObjectSize(expectedObjectSize);
+  }
+
   static SoftDeleted softDeleted(boolean softDeleted) {
     return new SoftDeleted(softDeleted);
   }
@@ -1832,6 +1843,25 @@ public Mapper<UpdateObjectRequest.Builder> updateObject() {
     }
   }
 
+  static final class ResumableUploadExpectedObjectSize extends RpcOptVal<@NonNull Long>
+      implements ObjectTargetOpt {
+    private static final long serialVersionUID = 3640126281492196357L;
+
+    private ResumableUploadExpectedObjectSize(@NonNull Long val) {
+      super(StorageRpc.Option.X_UPLOAD_CONTENT_LENGTH, val);
+    }
+
+    @Override
+    public Mapper<StartResumableWriteRequest.Builder> startResumableWrite() {
+      return b -> {
+        if (val > 0) {
+          b.getWriteObjectSpecBuilder().setObjectSize(val);
+        }
+        return b;
+      };
+    }
+  }
+
   static final class ShowDeletedKeys extends RpcOptVal<@NonNull Boolean> implements HmacKeyListOpt {
     private static final long serialVersionUID = -6604176744362903487L;
 
@@ -2441,6 +2471,10 @@ Mapper<BidiWriteObjectRequest.Builder> bidiWriteObjectRequest() {
       return fuseMappers(ObjectTargetOpt.class, ObjectTargetOpt::bidiWriteObject);
     }
 
+    Mapper<StartResumableWriteRequest.Builder> startResumableWriteRequest() {
+      return fuseMappers(ObjectTargetOpt.class, ObjectTargetOpt::startResumableWrite);
+    }
+
     Mapper<GetObjectRequest.Builder> getObjectsRequest() {
       return fuseMappers(ObjectSourceOpt.class, ObjectSourceOpt::getObject);
     }

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/spi/v1/HttpStorageRpc.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/spi/v1/HttpStorageRpc.java
@@ -1090,6 +1090,10 @@ public String open(StorageObject object, Map<Option, ?> options) {
           requestFactory.buildPostRequest(url, new JsonHttpContent(jsonFactory, object));
       HttpHeaders requestHeaders = httpRequest.getHeaders();
       requestHeaders.set("X-Upload-Content-Type", detectContentType(object, options));
+      Long xUploadContentLength = Option.X_UPLOAD_CONTENT_LENGTH.getLong(options);
+      if (xUploadContentLength != null) {
+        requestHeaders.set("X-Upload-Content-Length", xUploadContentLength);
+      }
       setEncryptionHeaders(requestHeaders, "x-goog-encryption-", options);
       HttpResponse response = httpRequest.execute();
       if (response.getStatusCode() != 200) {

diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/spi/v1/StorageRpc.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/spi/v1/StorageRpc.java
@@ -77,7 +77,8 @@ enum Option {
     SOFT_DELETED("softDeleted"),
     COPY_SOURCE_ACL("copySourceAcl"),
     GENERATION("generation"),
-    INCLUDE_FOLDERS_AS_PREFIXES("includeFoldersAsPrefixes");
+    INCLUDE_FOLDERS_AS_PREFIXES("includeFoldersAsPrefixes"),
+    X_UPLOAD_CONTENT_LENGTH("x-upload-content-length");
 
     private final String value;
 

diff --git a/...d-storage/src/test/java/com/google/cloud/storage/GapicUploadSessionBuilderSyntaxTest.java b/...d-storage/src/test/java/com/google/cloud/storage/GapicUploadSessionBuilderSyntaxTest.java
@@ -23,6 +23,7 @@
 import com.google.api.core.ApiFutures;
 import com.google.api.gax.rpc.ClientStreamingCallable;
 import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.storage.UnifiedOpts.Opts;
 import com.google.storage.v2.StartResumableWriteRequest;
 import com.google.storage.v2.StartResumableWriteResponse;
 import com.google.storage.v2.WriteObjectRequest;
@@ -94,7 +95,7 @@ public void syntax_directBuffered_fluent() {
   @Test
   public void syntax_resumableUnbuffered_fluent() {
     ApiFuture<ResumableWrite> startAsync =
-        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req);
+        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req, Opts.empty());
     UnbufferedWritableByteChannelSession<WriteObjectResponse> session =
         ResumableMedia.gapic()
             .write()
@@ -110,7 +111,7 @@ public void syntax_resumableUnbuffered_fluent() {
   @Test
   public void syntax_resumableBuffered_fluent() {
     ApiFuture<ResumableWrite> startAsync =
-        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req);
+        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req, Opts.empty());
     BufferedWritableByteChannelSession<WriteObjectResponse> session =
         ResumableMedia.gapic()
             .write()
@@ -150,7 +151,7 @@ public void syntax_directBuffered_incremental() {
   @Test
   public void syntax_resumableUnbuffered_incremental() {
     ApiFuture<ResumableWrite> startAsync =
-        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req);
+        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req, Opts.empty());
     GapicWritableByteChannelSessionBuilder b1 =
         ResumableMedia.gapic()
             .write()
@@ -164,7 +165,7 @@ public void syntax_resumableUnbuffered_incremental() {
   @Test
   public void syntax_resumableBuffered_incremental() {
     ApiFuture<ResumableWrite> startAsync =
-        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req);
+        ResumableMedia.gapic().write().resumableWrite(startResumableWrite, req, Opts.empty());
     GapicWritableByteChannelSessionBuilder b1 =
         ResumableMedia.gapic()
             .write()