1 files changed, 33 insertions, 0 deletions
diff --git a/src/kernel/notifications_interface.h b/src/kernel/notifications_interface.h
new file mode 100644
index 0000000000..48248e9aa0
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+++ b/src/kernel/notifications_interface.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2023 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_KERNEL_NOTIFICATIONS_INTERFACE_H
+#define BITCOIN_KERNEL_NOTIFICATIONS_INTERFACE_H
+
+#include <cstdint>
+#include <string>
+
+class CBlockIndex;
+enum class SynchronizationState;
+struct bilingual_str;
+
+namespace kernel {
+
+/**
+ * A base class defining functions for notifying about certain kernel
+ * events.
+ */
+class Notifications
+{
+public:
+    virtual ~Notifications(){};
+
+    virtual void blockTip(SynchronizationState state, CBlockIndex& index) {}
+    virtual void headerTip(SynchronizationState state, int64_t height, int64_t timestamp, bool presync) {}
+    virtual void progress(const bilingual_str& title, int progress_percent, bool resume_possible) {}
+    virtual void warning(const bilingual_str& warning) {}
+};
+} // namespace kernel
+
+#endif // BITCOIN_KERNEL_NOTIFICATIONS_INTERFACE_H