rpc: expose RPC metadata for introspection

src/rpc/server.h

@@ -63,6 +63,7 @@ public:
               fn().GetArgNames(),
               intptr_t(fn))
     {
+        this->metadata_fn = fn;
     }
 
     std::string category;
@@ -79,6 +80,7 @@ public:
     //! appended after other arguments, see transformNamedArguments for details.
     std::vector<std::pair<std::string, bool>> argNames;
     intptr_t unique_id;
+    RpcMethodFnType metadata_fn{nullptr};
 };
 
 /**

src/rpc/util.h

@@ -518,6 +518,9 @@ public:
     bool IsValidNumArgs(size_t num_args) const;
     //! Return list of arguments and whether they are named-only.
     std::vector<std::pair<std::string, bool>> GetArgNames() const;
+    const std::string& GetDescription() const { return m_description; }
+    const std::vector<RPCArg>& GetArgs() const { return m_args; }
+    const RPCResults& GetResults() const { return m_results; }
 
     const std::string m_name;
 

src/wallet/interfaces.cpp

@@ -544,6 +544,7 @@ public:
                 wallet_request.context = &m_context;
                 return command.actor(wallet_request, result, last_handler);
             }, command.argNames, command.unique_id);
+            m_rpc_commands.back().metadata_fn = command.metadata_fn;
             m_rpc_handlers.emplace_back(m_context.chain->handleRpc(m_rpc_commands.back()));
         }
     }