settings: Add update/getPersistent/isIgnored methods

Add interfaces::Node methods to give GUI finer grained control over
settings.json file. Update method is used to write settings to the file,
getPersistent and isIgnored methods are used to find out about settings
file and command line option interactions.

1 files changed, 20 insertions, 5 deletions

diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index c4dc303dd5..1585174a6f 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -5,12 +5,13 @@
 #ifndef BITCOIN_INTERFACES_NODE_H
 #define BITCOIN_INTERFACES_NODE_H
 
-#include <consensus/amount.h>
-#include <net.h>        // For NodeId
-#include <net_types.h>  // For banmap_t
-#include <netaddress.h> // For Network
-#include <netbase.h>    // For ConnectionDirection
+#include <consensus/amount.h>          // For CAmount
+#include <net.h>                       // For NodeId
+#include <net_types.h>                 // For banmap_t
+#include <netaddress.h>                // For Network
+#include <netbase.h>                   // For ConnectionDirection
 #include <support/allocators/secure.h> // For SecureString
+#include <util/settings.h>             // For util::SettingsValue
 #include <util/translation.h>
 
 #include <functional>
@@ -97,6 +98,20 @@ public:
     //! Return whether shutdown was requested.
     virtual bool shutdownRequested() = 0;
 
+    //! Return whether a particular setting in <datadir>/settings.json is or
+    //! would be ignored because it is also specified in the command line.
+    virtual bool isSettingIgnored(const std::string& name) = 0;
+
+    //! Return setting value from <datadir>/settings.json or bitcoin.conf.
+    virtual util::SettingsValue getPersistentSetting(const std::string& name) = 0;
+
+    //! Update a setting in <datadir>/settings.json.
+    virtual void updateRwSetting(const std::string& name, const util::SettingsValue& value) = 0;
+
+    //! Force a setting value to be applied, overriding any other configuration
+    //! source, but not being persisted.
+    virtual void forceSetting(const std::string& name, const util::SettingsValue& value) = 0;
+
     //! Map port.
     virtual void mapPort(bool use_upnp, bool use_natpmp) = 0;