fix: fix interrupt spiral in grpc ReadObject drainQueue (googleapis#2850)

If our thread is interrupted while attempting to drainQueue poll will throw an InterruptedException, instead of setting the flag back on the thread immediately we need to defer setting it until we complete our draining. If we don't defer setting it, we can never actually drain our queue.

Author: BenWhitehead

google-cloud-storage/src/main/java/com/google/cloud/storage/GapicUnbufferedReadableByteChannel.java

@@ -234,35 +234,42 @@ public void close() throws IOException {
   }
 
   private void drainQueue() throws IOException {
-    IOException ioException = null;
-    while (queue.nonEmpty()) {
-      try {
-        java.lang.Object queueValue = queue.poll();
-        if (queueValue instanceof ReadObjectResponse) {
-          ReadObjectResponse resp = (ReadObjectResponse) queueValue;
-          ResponseContentLifecycleHandle handle = rclm.get(resp);
-          handle.close();
-        } else if (queueValue == EOF_MARKER || queueValue instanceof Throwable) {
-          break;
-        }
-      } catch (IOException e) {
-        if (ioException == null) {
-          ioException = e;
-        } else if (ioException != e) {
-          ioException.addSuppressed(e);
+    boolean shouldInterupt = false;
+    try {
+      IOException ioException = null;
+      while (queue.nonEmpty()) {
+        try {
+          java.lang.Object queueValue = queue.poll();
+          if (queueValue instanceof ReadObjectResponse) {
+            ReadObjectResponse resp = (ReadObjectResponse) queueValue;
+            ResponseContentLifecycleHandle handle = rclm.get(resp);
+            handle.close();
+          } else if (queueValue == EOF_MARKER || queueValue instanceof Throwable) {
+            break;
+          }
+        } catch (IOException e) {
+          if (ioException == null) {
+            ioException = e;
+          } else if (ioException != e) {
+            ioException.addSuppressed(e);
+          }
+        } catch (InterruptedException e) {
+          shouldInterupt = true;
+          if (ioException == null) {
+            ioException = new InterruptedIOException();
+          } else {
+            ioException.addSuppressed(e);
+          }
         }
-      } catch (InterruptedException e) {
+      }
+      if (ioException != null) {
+        throw ioException;
+      }
+    } finally {
+      if (shouldInterupt) {
         Thread.currentThread().interrupt();
-        if (ioException == null) {
-          ioException = new InterruptedIOException();
-        } else {
-          ioException.addSuppressed(e);
-        }
       }
     }
-    if (ioException != null) {
-      throw ioException;
-    }
   }
 
   ApiFuture<Object> getResult() {