interface: Expose load utxo snapshot functionality

Expose load/activate AssumeUTXO snapshot functionaility so that it can be laoded trhough the GUI.

Author: D33r-Gee

src/interfaces/node.h

@@ -10,6 +10,7 @@
 #include <logging.h>                   // For BCLog::CategoryMask
 #include <net.h>                       // For NodeId
 #include <net_types.h>                 // For banmap_t
+#include <node/utxo_snapshot.h>        // For SnapshotMetadata
 #include <netaddress.h>                // For Network
 #include <netbase.h>                   // For ConnectionDirection
 #include <support/allocators/secure.h> // For SecureString
@@ -205,6 +206,9 @@ class Node
     //! List rpc commands.
     virtual std::vector<std::string> listRpcCommands() = 0;
 
+    //! Load and activate a snapshot file
+    virtual bool loadSnapshot(AutoFile& coins_file, const node::SnapshotMetadata& metadata, bool in_memory) = 0;
+
     //! Set RPC timer interface if unset.
     virtual void rpcSetTimerInterfaceIfUnset(RPCTimerInterface* iface) = 0;
 

src/node/interfaces.cpp

@@ -355,6 +355,11 @@ class NodeImpl : public Node
         return ::tableRPC.execute(req);
     }
     std::vector<std::string> listRpcCommands() override { return ::tableRPC.listCommands(); }
+    bool loadSnapshot(AutoFile& coins_file, const SnapshotMetadata& metadata, bool in_memory) override
+    {
+        auto activation_result{chainman().ActivateSnapshot(coins_file, metadata, in_memory)};
+        return activation_result.has_value();
+    }
     void rpcSetTimerInterfaceIfUnset(RPCTimerInterface* iface) override { RPCSetTimerInterfaceIfUnset(iface); }
     void rpcUnsetTimerInterface(RPCTimerInterface* iface) override { RPCUnsetTimerInterface(iface); }
     std::optional<Coin> getUnspentOutput(const COutPoint& output) override