[rpc] new methods in api

:Release Notes:
added new implicit rpc method:
"get-available-methods"

get_count
get_method_name_by_id
get_method_names

:Detailed Notes:
-

:Testing Performed:
weak coverage

:QA Notes:
-

:Issues Addressed:
TG-4 #done

include/cloud_point_rpc/rpc_server.hpp

@@ -23,12 +23,22 @@ class CRPC_EXPORT RpcServer {
     using Handler    = std::function<nlohmann::json(const nlohmann::json &)>;
     using callback_t = rpc_string *(*)(rpc_string *);
 
+  public:
+    /// @note +1 method implicitly added: get-available-methods
+    RpcServer();
+
     void register_method(const std::string &name, Handler handler);
     void register_method(const std::string &name, callback_t handler);
+
+    uint64_t get_count() noexcept;
+    std::span<std::string_view> get_method_names() noexcept;
+    std::string_view get_method_name_by_id(uint64_t id) noexcept;
+
     ///@param request_str json rpc 2.0 formatted string
     [[nodiscard]] std::string process(const std::string &request_str);
 
   private:
+    std::vector<std::string_view> handler_names_;
     std::map<std::string, Handler> handlers_;
 };
 

include/server_api.h

@@ -29,6 +29,8 @@ typedef rpc_string*(*callback_t)(rpc_string*);
 CRPC_EXPORT void crpc_init(const char* config_path);
 CRPC_EXPORT void crpc_deinit();
 
+CRPC_EXPORT rpc_string* crpc_get_method_name_by_id(uint64_t id);
+CRPC_EXPORT uint64_t crpc_get_methods_count();
 CRPC_EXPORT void crpc_add_method(callback_t cb, rpc_string* name);
 
 #ifdef __cplusplus

src/rpc_server.cpp

@@ -1,4 +1,5 @@
 #include "cloud_point_rpc/rpc_server.hpp"
+#include <cstdint>
 #include <glog/logging.h>
 using json = nlohmann::json;
 
@@ -17,8 +18,15 @@ json create_success(const json &result, const json &id) {
 }
 } // namespace
 
+RpcServer::RpcServer() {
+    register_method("get-available-methods", [&](const json&) {
+        return get_method_names();
+    });
+}
+
 void RpcServer::register_method(const std::string &name, Handler handler) {
     handlers_[name] = std::move(handler);
+    handler_names_.push_back(handlers_.find(name)->first);
 }
 
 void RpcServer::register_method(const std::string &name, callback_t handler) {
@@ -28,6 +36,23 @@ void RpcServer::register_method(const std::string &name, callback_t handler) {
         rpc_string *res = handler(&tmp);
         return {res->s};
     };
+    handler_names_.push_back(handlers_.find(name)->first);
+}
+
+std::span<std::string_view> RpcServer::get_method_names() noexcept {
+    return this->handler_names_;
+}
+
+uint64_t RpcServer::get_count() noexcept {
+    return this->handler_names_.size();
+}
+
+std::string_view RpcServer::get_method_name_by_id(uint64_t id) noexcept {
+    if(id >= handler_names_.size()) {
+        LOG(ERROR) << __func__ << std::format(": called with id = {} which is bigger, than size={}", id, handler_names_.size());
+        return {};
+    }
+    return handler_names_.at(id);
 }
 
 std::string RpcServer::process(const std::string &request_str) {

src/server_api.cpp

@@ -1,12 +1,12 @@
+#include "server_api.h"
 #include "cloud_point_rpc/config.hpp"
 #include "cloud_point_rpc/rpc_server.hpp"
 #include "cloud_point_rpc/tcp_server.hpp"
-#include <glog/logging.h>
-#include "server_api.h"
 #include <algorithm>
+#include <glog/logging.h>
+#include <list>
 #include <memory>
 #include <string>
-#include <list>
 
 static std::list<std::unique_ptr<rpc_string>> gc;
 score::RpcServer rpc_server;
@@ -18,9 +18,7 @@ const char* crpc_str_get_data(const rpc_string* that) {
     return that->s.c_str();
 }
 
-uint64_t crpc_str_get_size(const rpc_string* that){
-    return that->s.size();
-}
+uint64_t crpc_str_get_size(const rpc_string *that) { return that->s.size(); }
 
 rpc_string *crpc_str_create(const char *data, uint64_t size) {
     gc.push_back(std::make_unique<rpc_string>(data, size));
@@ -33,7 +31,6 @@ void crpc_str_destroy(rpc_string* that){
         gc.erase(it);
 }
 
-
 void crpc_init(const char *config_path) {
     google::InitGoogleLogging("CloudPointRPC");
     if (config_path == nullptr) {
@@ -43,10 +40,10 @@ void crpc_init(const char* config_path) {
         auto config = score::ConfigLoader::load(config_path);
         LOG(INFO) << "Loaded config from " << config_path;
 
-        server = std::make_unique<score::TcpServer>(config.server.ip, config.server.port,
+        server = std::make_unique<score::TcpServer>(
+            config.server.ip, config.server.port,
             [&](const std::string &request) {
-                                              return rpc_server.process(
-                                                  request);
+                return rpc_server.process(request);
             });
         server->start();
     } catch (const std::exception &e) {
@@ -64,5 +61,14 @@ void crpc_deinit() {
 void crpc_add_method(callback_t cb, rpc_string *name) {
     rpc_server.register_method(name->s, cb);
 }
+
+rpc_string *crpc_get_method_name_by_id(uint64_t id) {
+    auto value = rpc_server.get_method_name_by_id(id);
+
+    return crpc_str_create(value.data(), value.size());
 }
 
+uint64_t crpc_get_methods_count() {
+    return rpc_server.get_count();
+}
+}

tests/test_rpc.cpp

@@ -61,3 +61,16 @@ TEST_F(RpcServerTest, InvalidJsonReturnsParseError) {
     ASSERT_TRUE(response.contains("error"));
     EXPECT_EQ(response["error"]["code"], -32700);
 }
+
+TEST_F(RpcServerTest, GetMethod) {
+    EXPECT_EQ(server.get_count(), 2);
+    EXPECT_EQ(server.get_method_name_by_id(1), "get-intrinsic-params");
+    EXPECT_EQ(server.get_method_names()[1], "get-intrinsic-params");
+
+    server.register_method("get-test-2", [&](const json&){
+        return "test";
+    });
+    EXPECT_EQ(server.get_count(), 3);
+    EXPECT_EQ(server.get_method_name_by_id(2), "get-test-2");
+    EXPECT_EQ(server.get_method_names()[2], "get-test-2");
+}