[qob] allow writing to requester pays buckets

CHANGELOG: In Query-on-Batch, allow writing to requester pays buckets, which was broken before this release.

hail/python/test/hail/fs/test_worker_driver_fs.py

@@ -25,6 +25,18 @@ def test_requester_pays_write_no_settings():
         assert False
 
 
+@skip_in_azure
+def test_requester_pays_write_with_project():
+    hl.stop()
+    hl.init(gcs_requester_pays_configuration='hail-vdc')
+    random_filename = 'gs://hail-services-requester-pays/test_requester_pays_on_worker_driver_' + secret_alnum_string(10)
+    try:
+        hl.utils.range_table(4, n_partitions=4).write(random_filename, overwrite=True)
+    finally:
+        hl.current_backend().fs.rmtree(random_filename)
+        assert False
+
+
 @skip_in_azure
 def test_requester_pays_with_project():
     hl.stop()

hail/src/main/scala/is/hail/io/fs/GoogleStorageFS.scala

@@ -261,13 +261,28 @@ class GoogleStorageFS(
       .build()
 
     val os: PositionedOutputStream = new FSPositionedOutputStream(8 * 1024 * 1024) {
-      private[this] val write: WriteChannel = storage.writer(blobInfo)
+      private[this] var writer: WriteChannel = null
+
+      private[this] def writeHandlingRequesterPays(): Int = {
+        if (writer != null) {
+          writer.write(bb)
+        } else {
+          handleRequesterPays(
+            { (options: Seq[BlobSourceOption]) =>
+              writer = storage.writer(blobInfo, options:_*)
+              writer.write(bb)
+            },
+            BlobSourceOption.userProject _,
+            bucket
+          )
+        }
+      }
 
       override def flush(): Unit = {
         bb.flip()
 
         while (bb.remaining() > 0)
-          write.write(bb)
+          writeHandlingRequesterPays()
 
         bb.clear()
       }