added external rpc implementation

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "rpc"]
+	path = rpc
+	url = https://github.com/jsonrpcx/json-rpc-cxx.git

include/cloud_point_rpc/rpc_server.hpp

@@ -1,20 +1,21 @@
 #pragma once
 
-#include <string>
 #include <functional>
+#include <jsonrpccxx/server.hpp>
 #include <map>
 #include <nlohmann/json.hpp>
+#include <string>
 
 namespace cloud_point_rpc {
 
 class RpcServer {
- public:
+public:
     using Handler = std::function<nlohmann::json(const nlohmann::json&)>;
 
     void register_method(const std::string& name, Handler handler);
     [[nodiscard]] std::string process(const std::string& request_str);
 
- private:
+private:
     std::map<std::string, Handler> handlers_;
 };
 

meson.build

@@ -22,7 +22,7 @@ gtest_dep = gtest_proj.get_variable('gtest_dep')
 gtest_main_dep = gtest_proj.get_variable('gtest_main_dep')
 gmock_dep = gtest_proj.get_variable('gmock_dep')
 
-inc = include_directories('include')
+inc = include_directories(['include', 'rpc/include'])
 
 subdir('src')
 subdir('tests')

rpc

@@ -0,0 +1 @@
+Subproject commit a0e195b575d62cb07016321ac9cd7e1b9e048fe5