3 files changed, 189 insertions, 0 deletions
diff --git a/src/tools/rbd_mirror/pool_watcher/RefreshImagesRequest.cc b/src/tools/rbd_mirror/pool_watcher/RefreshImagesRequest.cc
new file mode 100644
index 000000000..a1d9c1b54
--- /dev/null
+++ b/src/tools/rbd_mirror/pool_watcher/RefreshImagesRequest.cc
@@ -0,0 +1,89 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "tools/rbd_mirror/pool_watcher/RefreshImagesRequest.h"
+#include "common/debug.h"
+#include "common/errno.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/Utils.h"
+#include <map>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::pool_watcher::RefreshImagesRequest " \
+                           << this << " " << __func__ << ": "
+
+namespace rbd {
+namespace mirror {
+namespace pool_watcher {
+
+static const uint32_t MAX_RETURN = 1024;
+
+using librbd::util::create_rados_callback;
+
+template <typename I>
+void RefreshImagesRequest<I>::send() {
+  m_image_ids->clear();
+  mirror_image_list();
+}
+
+template <typename I>
+void RefreshImagesRequest<I>::mirror_image_list() {
+  dout(10) << dendl;
+
+  librados::ObjectReadOperation op;
+  librbd::cls_client::mirror_image_list_start(&op, m_start_after, MAX_RETURN);
+
+  m_out_bl.clear();
+  librados::AioCompletion *aio_comp = create_rados_callback<
+    RefreshImagesRequest<I>,
+    &RefreshImagesRequest<I>::handle_mirror_image_list>(this);
+  int r = m_remote_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
+  ceph_assert(r == 0);
+  aio_comp->release();
+}
+
+template <typename I>
+void RefreshImagesRequest<I>::handle_mirror_image_list(int r) {
+  dout(10) << "r=" << r << dendl;
+
+  std::map<std::string, std::string> ids;
+  if (r == 0) {
+    auto it = m_out_bl.cbegin();
+    r = librbd::cls_client::mirror_image_list_finish(&it, &ids);
+  }
+
+  if (r < 0 && r != -ENOENT) {
+    derr << "failed to list mirrored images: " << cpp_strerror(r) << dendl;
+    finish(r);
+    return;
+  }
+
+  // store as global -> local image ids
+  for (auto &id : ids) {
+    m_image_ids->emplace(id.second, id.first);
+  }
+
+  if (ids.size() == MAX_RETURN) {
+    m_start_after = ids.rbegin()->first;
+    mirror_image_list();
+    return;
+  }
+
+  finish(0);
+}
+
+template <typename I>
+void RefreshImagesRequest<I>::finish(int r) {
+  dout(10) << "r=" << r << dendl;
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+} // namespace pool_watcher
+} // namespace mirror
+} // namespace rbd
+
+template class rbd::mirror::pool_watcher::RefreshImagesRequest<librbd::ImageCtx>;
diff --git a/src/tools/rbd_mirror/pool_watcher/RefreshImagesRequest.h b/src/tools/rbd_mirror/pool_watcher/RefreshImagesRequest.h
new file mode 100644
index 000000000..8bfeabe29
--- /dev/null
+++ b/src/tools/rbd_mirror/pool_watcher/RefreshImagesRequest.h
@@ -0,0 +1,73 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_RBD_MIRROR_POOL_WATCHER_REFRESH_IMAGES_REQUEST_H
+#define CEPH_RBD_MIRROR_POOL_WATCHER_REFRESH_IMAGES_REQUEST_H
+
+#include "include/buffer.h"
+#include "include/rados/librados.hpp"
+#include "tools/rbd_mirror/Types.h"
+#include <string>
+
+struct Context;
+
+namespace librbd { struct ImageCtx; }
+
+namespace rbd {
+namespace mirror {
+namespace pool_watcher {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+class RefreshImagesRequest {
+public:
+  static RefreshImagesRequest *create(librados::IoCtx &remote_io_ctx,
+                                      ImageIds *image_ids, Context *on_finish) {
+    return new RefreshImagesRequest(remote_io_ctx, image_ids, on_finish);
+  }
+
+  RefreshImagesRequest(librados::IoCtx &remote_io_ctx, ImageIds *image_ids,
+                       Context *on_finish)
+    : m_remote_io_ctx(remote_io_ctx), m_image_ids(image_ids),
+      m_on_finish(on_finish) {
+  }
+
+  void send();
+
+private:
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    |   /-------------\
+   *    |   |             |
+   *    v   v             | (more images)
+   * MIRROR_IMAGE_LIST ---/
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   */
+
+  librados::IoCtx &m_remote_io_ctx;
+  ImageIds *m_image_ids;
+  Context *m_on_finish;
+
+  bufferlist m_out_bl;
+  std::string m_start_after;
+
+  void mirror_image_list();
+  void handle_mirror_image_list(int r);
+
+  void finish(int r);
+
+};
+
+} // namespace pool_watcher
+} // namespace mirror
+} // namespace rbd
+
+extern template class rbd::mirror::pool_watcher::RefreshImagesRequest<librbd::ImageCtx>;
+
+#endif // CEPH_RBD_MIRROR_POOL_WATCHER_REFRESH_IMAGES_REQUEST_H
diff --git a/src/tools/rbd_mirror/pool_watcher/Types.h b/src/tools/rbd_mirror/pool_watcher/Types.h
new file mode 100644
index 000000000..52dfc342d
--- /dev/null
+++ b/src/tools/rbd_mirror/pool_watcher/Types.h
@@ -0,0 +1,27 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_RBD_MIRROR_POOL_WATCHER_TYPES_H
+#define CEPH_RBD_MIRROR_POOL_WATCHER_TYPES_H
+
+#include "tools/rbd_mirror/Types.h"
+#include <string>
+
+namespace rbd {
+namespace mirror {
+namespace pool_watcher {
+
+struct Listener {
+  virtual ~Listener() {
+  }
+
+  virtual void handle_update(const std::string &mirror_uuid,
+                             ImageIds &&added_image_ids,
+                             ImageIds &&removed_image_ids) = 0;
+};
+
+} // namespace pool_watcher
+} // namespace mirror
+} // namespace rbd
+
+#endif // CEPH_RBD_MIRROR_POOL_WATCHER_TYPES_H