1 files changed, 85 insertions, 0 deletions
diff --git a/src/tools/cephfs_mirror/InstanceWatcher.h b/src/tools/cephfs_mirror/InstanceWatcher.h
new file mode 100644
index 000000000..06edf5da9
--- /dev/null
+++ b/src/tools/cephfs_mirror/InstanceWatcher.h
@@ -0,0 +1,85 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPHFS_MIRROR_INSTANCE_WATCHER_H
+#define CEPHFS_MIRROR_INSTANCE_WATCHER_H
+
+#include <string_view>
+
+#include "common/ceph_mutex.h"
+#include "include/Context.h"
+#include "include/rados/librados.hpp"
+#include "Watcher.h"
+
+class ContextWQ;
+
+namespace cephfs {
+namespace mirror {
+
+// watch directory update notifications via per daemon rados
+// object and invoke listener callback.
+
+class InstanceWatcher : public Watcher {
+public:
+  struct Listener {
+    virtual ~Listener() {
+    }
+
+    virtual void acquire_directory(string_view dir_path) = 0;
+    virtual void release_directory(string_view dir_path) = 0;
+  };
+
+  static InstanceWatcher *create(librados::IoCtx &ioctx,
+                                 Listener &listener, ContextWQ *work_queue) {
+    return new InstanceWatcher(ioctx, listener, work_queue);
+  }
+
+  InstanceWatcher(librados::IoCtx &ioctx, Listener &listener, ContextWQ *work_queue);
+  ~InstanceWatcher();
+
+  void init(Context *on_finish);
+  void shutdown(Context *on_finish);
+
+  void handle_notify(uint64_t notify_id, uint64_t handle,
+                     uint64_t notifier_id, bufferlist& bl) override;
+  void handle_rewatch_complete(int r) override;
+
+  bool is_blocklisted() {
+    std::scoped_lock locker(m_lock);
+    return m_blocklisted;
+  }
+
+  bool is_failed() {
+    std::scoped_lock locker(m_lock);
+    return m_failed;
+  }
+
+private:
+  librados::IoCtx &m_ioctx;
+  Listener &m_listener;
+  ContextWQ *m_work_queue;
+
+  ceph::mutex m_lock;
+  Context *m_on_init_finish = nullptr;
+  Context *m_on_shutdown_finish = nullptr;
+
+  bool m_blocklisted = false;
+  bool m_failed = false;
+
+  void create_instance();
+  void handle_create_instance(int r);
+
+  void register_watcher();
+  void handle_register_watcher(int r);
+
+  void remove_instance();
+  void handle_remove_instance(int r);
+
+  void unregister_watcher();
+  void handle_unregister_watcher(int r);
+};
+
+} // namespace mirror
+} // namespace cephfs
+
+#endif // CEPHFS_MIRROR_INSTANCE_WATCHER_H