1 files changed, 21 insertions, 3 deletions
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index af45f81f95..be596b1765 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -96,6 +96,17 @@ struct BlockInfo {
     BlockInfo(const uint256& hash LIFETIMEBOUND) : hash(hash) {}
 };
 
+//! The action to be taken after updating a settings value.
+//! WRITE indicates that the updated value must be written to disk,
+//! while SKIP_WRITE indicates that the change will be kept in memory-only
+//! without persisting it.
+enum class SettingsAction {
+    WRITE,
+    SKIP_WRITE
+};
+
+using SettingsUpdate = std::function<std::optional<interfaces::SettingsAction>(common::SettingsValue&)>;
+
 //! Interface giving clients (wallet processes, maybe other analysis tools in
 //! the future) ability to access to the chain state, receive notifications,
 //! estimate fees, and submit transactions.
@@ -344,9 +355,16 @@ public:
     //! Return <datadir>/settings.json setting value.
     virtual common::SettingsValue getRwSetting(const std::string& name) = 0;
 
-    //! Write a setting to <datadir>/settings.json. Optionally just update the
-    //! setting in memory and do not write the file.
-    virtual bool updateRwSetting(const std::string& name, const common::SettingsValue& value, bool write=true) = 0;
+    //! Updates a setting in <datadir>/settings.json.
+    //! Depending on the action returned by the update function, this will either
+    //! update the setting in memory or write the updated settings to disk.
+    virtual bool updateRwSetting(const std::string& name, const SettingsUpdate& update_function) = 0;
+
+    //! Replace a setting in <datadir>/settings.json with a new value.
+    virtual bool overwriteRwSetting(const std::string& name, common::SettingsValue& value, bool write = true) = 0;
+
+    //! Delete a given setting in <datadir>/settings.json.
+    virtual bool deleteRwSettings(const std::string& name, bool write = true) = 0;
 
     //! Synchronously send transactionAddedToMempool notifications about all
     //! current mempool transactions to the specified handler and return after