Add timeout to blockingAwait

as a workaround for bazelbuild#19513.

PiperOrigin-RevId: 569152388
Change-Id: I51e64f4708fc62ca3078290231e4195a081855df

src/main/java/com/google/devtools/build/lib/remote/RemoteExecutionCache.java

@@ -22,6 +22,7 @@
 import static com.google.devtools.build.lib.remote.util.RxUtils.mergeBulkTransfer;
 import static com.google.devtools.build.lib.remote.util.RxUtils.toTransferResult;
 import static java.lang.String.format;
+import static java.util.concurrent.TimeUnit.SECONDS;
 
 import build.bazel.remote.execution.v2.Digest;
 import build.bazel.remote.execution.v2.Directory;
@@ -112,7 +113,10 @@ public void ensureInputsPresent(
                         }));
 
     try {
-      mergeBulkTransfer(uploads).blockingAwait();
+      // Workaround for https://github.com/bazelbuild/bazel/issues/19513.
+      if (!mergeBulkTransfer(uploads).blockingAwait(options.remoteTimeout.getSeconds(), SECONDS)) {
+        throw new IOException("Timed out when waiting for uploads");
+      }
     } catch (RuntimeException e) {
       Throwable cause = e.getCause();
       if (cause != null) {