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diff --git a/src/tools/rbd_mirror/RemotePoolPoller.h b/src/tools/rbd_mirror/RemotePoolPoller.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_RBD_MIRROR_REMOTE_POOL_POLLER_H
+#define CEPH_RBD_MIRROR_REMOTE_POOL_POLLER_H
+
+#include "include/rados/librados.hpp"
+#include "tools/rbd_mirror/Types.h"
+#include <string>
+
+struct Context;
+namespace librbd { struct ImageCtx; }
+
+namespace rbd {
+namespace mirror {
+
+template <typename> struct Threads;
+
+namespace remote_pool_poller {
+
+struct Listener {
+ virtual ~Listener() {}
+
+ virtual void handle_updated(const RemotePoolMeta& remote_pool_meta) = 0;
+};
+
+}; // namespace remote_pool_poller
+
+template <typename ImageCtxT>
+class RemotePoolPoller {
+public:
+ static RemotePoolPoller* create(
+ Threads<ImageCtxT>* threads,
+ librados::IoCtx& remote_io_ctx,
+ const std::string& site_name,
+ const std::string& local_mirror_uuid,
+ remote_pool_poller::Listener& listener) {
+ return new RemotePoolPoller(threads, remote_io_ctx, site_name,
+ local_mirror_uuid, listener);
+ }
+
+ RemotePoolPoller(
+ Threads<ImageCtxT>* threads,
+ librados::IoCtx& remote_io_ctx,
+ const std::string& site_name,
+ const std::string& local_mirror_uuid,
+ remote_pool_poller::Listener& listener)
+ : m_threads(threads),
+ m_remote_io_ctx(remote_io_ctx),
+ m_site_name(site_name),
+ m_local_mirror_uuid(local_mirror_uuid),
+ m_listener(listener) {
+ }
+ ~RemotePoolPoller();
+
+ void init(Context* on_finish);
+ void shut_down(Context* on_finish);
+
+private:
+ /**
+ * @verbatim
+ *
+ * <start>
+ * |
+ * |/----------------------------\
+ * | |
+ * v |
+ * MIRROR_UUID_GET |
+ * | |
+ * v |
+ * MIRROR_PEER_PING |
+ * | |
+ * v |
+ * MIRROR_PEER_LIST |
+ * | |
+ * v |
+ * MIRROR_UUID_GET |
+ * | |
+ * v (skip if no changes) |
+ * NOTIFY_LISTENER |
+ * | |
+ * | (repeat periodically) |
+ * |\----------------------------/
+ * |
+ * v
+ * <finish>
+ *
+ * @endverbatim
+ */
+
+ enum State {
+ STATE_INITIALIZING,
+ STATE_POLLING,
+ STATE_SHUTTING_DOWN
+ };
+
+ Threads<ImageCtxT>* m_threads;
+ librados::IoCtx& m_remote_io_ctx;
+ std::string m_site_name;
+ std::string m_local_mirror_uuid;
+ remote_pool_poller::Listener& m_listener;
+
+ bufferlist m_out_bl;
+
+ RemotePoolMeta m_remote_pool_meta;
+ bool m_updated = false;
+
+ State m_state = STATE_INITIALIZING;
+ Context* m_timer_task = nullptr;
+ Context* m_on_finish = nullptr;
+
+ void get_mirror_uuid();
+ void handle_get_mirror_uuid(int r);
+
+ void mirror_peer_ping();
+ void handle_mirror_peer_ping(int r);
+
+ void mirror_peer_list();
+ void handle_mirror_peer_list(int r);
+
+ void notify_listener();
+
+ void schedule_task(int r);
+ void handle_task();
+
+};
+
+} // namespace mirror
+} // namespace rbd
+
+extern template class rbd::mirror::RemotePoolPoller<librbd::ImageCtx>;
+
+#endif // CEPH_RBD_MIRROR_REMOTE_POOL_POLLER_H