...

.gitignore

@@ -72,3 +72,4 @@ CMakeLists.txt.user*
 *.dll
 *.exe
 
+build/

CMakeLists.txt

@@ -4,7 +4,7 @@ project(ADC LANGUAGES CXX)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}")
 
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # set(CMAKE_BUILD_TYPE Release)
 
@@ -28,11 +28,10 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 #     message(WARNING "You are using an unsupported compiler! Compilation has only been tested with Clang and GCC.")
 # endif()
 
-
-
 set(ADC_COMMON_HEADERS
     common/adc_traits.h
     common/adc_utils.h
+    common/adc_serialization.h
     # common/adc_value_holder.h
     # common/adc_value.h
     # common/adc_valholder.h
@@ -45,7 +44,6 @@ set(ADC_DEVICE_HEADERS
     device/adc_device_concepts.h
 )
 
-
 set(ADC_NETWORK_HEADERS
     # net/adc_netmsg.h
     # net/adc_netmessage.h
@@ -60,56 +58,59 @@ set(ADC_NETWORK_HEADERS
     net/adc_device_netclient.h
 )
 
-
 option(ASIO_LIBRARY "Use of ASIO library for networking implementation" ON)
 
-if (ASIO_LIBRARY)
+if(ASIO_LIBRARY)
     find_package(ASIO REQUIRED)
 
-    set(ADC_NETWORK_HEADERS ${ADC_NETWORK_HEADERS}
+    set(ADC_NETWORK_HEADERS
+        ${ADC_NETWORK_HEADERS}
         net/asio/adc_netservice_asio.h
         net/asio/adc_device_netserver_asio.h
     )
 
     add_compile_definitions(PUBLIC USE_ASIO_LIBRARY)
 
-    option(OPENSSL_LIBRARY "Use openssl library for related ASIO-based implementation" ON)
+    option(
-    if (OPENSSL_LIBRARY)
+        OPENSSL_LIBRARY
+        "Use openssl library for related ASIO-based implementation"
+        ON
+    )
+    if(OPENSSL_LIBRARY)
         find_package(OpenSSL REQUIRED)
         add_compile_definitions(PUBLIC USE_OPENSSL_WITH_ASIO)
     endif()
 endif()
 
-
-
 option(SPDLOG_LIBRARY "Use of SPDLOG library for logging" ON)
 
-if (SPDLOG_LIBRARY)
+if(SPDLOG_LIBRARY)
     find_package(spdlog REQUIRED)
     find_package(fmt REQUIRED)
 
-    set(ADC_COMMON_HEADERS ${ADC_COMMON_HEADERS}
+    set(ADC_COMMON_HEADERS ${ADC_COMMON_HEADERS} common/adc_spdlog.h)
-        common/adc_spdlog.h
-    )
 
-    set(ADC_NETWORK_HEADERS ${ADC_NETWORK_HEADERS}
+    set(ADC_NETWORK_HEADERS ${ADC_NETWORK_HEADERS} net/adc_netserver_spdlog.h)
-        net/adc_netserver_spdlog.h
-    )
 
     add_compile_definitions(PUBLIC USE_SPDLOG_LIBRARY)
 endif()
 
+option(
+    USE_UWEBSOCKET
+    "Use of uWebsocket library for websocket-related staff"
+    ON
+)
 
-
+if(USE_UWEBSOCKET)
-option(USE_UWEBSOCKET "Use of uWebsocket library for websocket-related staff" ON)
-
-if (USE_UWEBSOCKET)
     include(FetchContent)
     include(ExternalProject)
 
-    FetchContent_Declare(uwebsockets
+    FetchContent_Declare(
-        SOURCE_DIR ${CMAKE_BINARY_DIR}/uWebsockets
+        uwebsockets
-        BINARY_DIR ${CMAKE_BINARY_DIR}
+        SOURCE_DIR
+        ${CMAKE_BINARY_DIR}/uWebsockets
+        BINARY_DIR
+        ${CMAKE_BINARY_DIR}
         GIT_REPOSITORY "https://github.com/uNetworking/uWebSockets.git"
         GIT_TAG "v20.67.0"
         GIT_SHALLOW TRUE
@@ -121,9 +122,12 @@ if (USE_UWEBSOCKET)
 
     set(UWEBSOCKETS_INCLUDE_DIR ${uwebsockets_SOURCE_DIR}/src)
 
-    FetchContent_Declare(usockets
+    FetchContent_Declare(
-        SOURCE_DIR ${uwebsockets_SOURCE_DIR}/uSockets
+        usockets
-        BINARY_DIR ${CMAKE_BINARY_DIR}
+        SOURCE_DIR
+        ${uwebsockets_SOURCE_DIR}/uSockets
+        BINARY_DIR
+        ${CMAKE_BINARY_DIR}
         GIT_REPOSITORY "https://github.com/uNetworking/uSockets.git"
         GIT_TAG "v0.8.8"
         GIT_SHALLOW TRUE
@@ -137,7 +141,8 @@ if (USE_UWEBSOCKET)
 
     include(ExternalProject)
 
-    ExternalProject_Add(LIBUS
+    ExternalProject_Add(
+        LIBUS
         SOURCE_DIR ${usockets_SOURCE_DIR}
         PREFIX ${CMAKE_BINARY_DIR}/_deps
         BUILD_IN_SOURCE TRUE
@@ -148,17 +153,19 @@ if (USE_UWEBSOCKET)
     )
 
     add_library(LIBUS_LIB STATIC IMPORTED)
-    set_target_properties(LIBUS_LIB PROPERTIES IMPORTED_LOCATION ${usockets_SOURCE_DIR}/uSockets.a)
+    set_target_properties(
+        LIBUS_LIB
+        PROPERTIES IMPORTED_LOCATION ${usockets_SOURCE_DIR}/uSockets.a
+    )
     get_target_property(LIBUS_LIB_PATH LIBUS_LIB IMPORTED_LOCATION)
 
     include_directories(${USOCKETS_INCLUDE_DIR})
     include_directories(${UWEBSOCKETS_INCLUDE_DIR})
-
 endif(USE_UWEBSOCKET)
 
 option(BUILD_TESTS "Build tests" ON)
 
-if (BUILD_TESTS)
+if(BUILD_TESTS)
     find_package(doctest)
 
     # set(VALUEHOLDER_TEST_APP adc_valueholder_test)
@@ -175,21 +182,34 @@ if (BUILD_TESTS)
 
     set(NETSERVICE_TEST_APP adc_netservice_test)
     add_executable(${NETSERVICE_TEST_APP} tests/adc_netservice_test.cpp)
-    if (OPENSSL_LIBRARY)
+    if(OPENSSL_LIBRARY)
-        target_link_libraries(${NETSERVICE_TEST_APP} OpenSSL::SSL OpenSSL::Crypto)
+        target_link_libraries(
+            ${NETSERVICE_TEST_APP}
+            OpenSSL::SSL
+            OpenSSL::Crypto
+        )
     endif()
 
-    if (ASIO_LIBRARY)
+    if(ASIO_LIBRARY)
         find_package(cxxopts CONFIG)
         set(ASIO_NETSERVER_TEST_APP adc_asio_netserver_test)
-        add_executable(${ASIO_NETSERVER_TEST_APP} tests/adc_asio_netserver_test.cpp)
+        add_executable(
-        target_link_libraries(${ASIO_NETSERVER_TEST_APP} PUBLIC Threads::Threads cxxopts::cxxopts)
+            ${ASIO_NETSERVER_TEST_APP}
-        if (OPENSSL_LIBRARY)
+            tests/adc_asio_netserver_test.cpp
-            target_link_libraries(${ASIO_NETSERVER_TEST_APP} PUBLIC OpenSSL::SSL OpenSSL::Crypto)
+        )
+        target_link_libraries(
+            ${ASIO_NETSERVER_TEST_APP}
+            PUBLIC Threads::Threads cxxopts::cxxopts
+        )
+        if(OPENSSL_LIBRARY)
+            target_link_libraries(
+                ${ASIO_NETSERVER_TEST_APP}
+                PUBLIC OpenSSL::SSL OpenSSL::Crypto
+            )
         endif()
     endif()
 
-    if (NOT doctest_FOUND)
+    if(NOT doctest_FOUND)
         include(FetchContent)
         FetchContent_Declare(
             doctest
@@ -207,7 +227,7 @@ if (BUILD_TESTS)
     add_test(NETMSG_TEST ${NETMSG_TEST_APP})
 
     add_test(ASIO_NETSRV_TEST ${ASIO_NETSERVER_TEST_APP})
-    if (SPDLOG_LIBRARY)
+    if(SPDLOG_LIBRARY)
         target_link_libraries(${ASIO_NETSERVER_TEST_APP} PRIVATE fmt::fmt)
     endif()
 
@@ -216,7 +236,13 @@ endif(BUILD_TESTS)
 
 include(GNUInstallDirs)
 
-add_library(${PROJECT_NAME} INTERFACE ${ADC_COMMON_HEADERS} ${ADC_DEVICE_HEADERS} ${ADC_NETWORK_HEADERS})
+add_library(
+    ${PROJECT_NAME}
+    INTERFACE
+    ${ADC_COMMON_HEADERS}
+    ${ADC_DEVICE_HEADERS}
+    ${ADC_NETWORK_HEADERS}
+)
 target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_20)
 # target_link_libraries(${PROJECT_NAME} INTERFACE ASIO::ASIO)
 target_include_directories(
@@ -225,4 +251,3 @@ target_include_directories(
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:include>
 )
-

common/adc_serialization.h

@@ -0,0 +1,518 @@
+#pragma once
+
+
+/*
+
+ABSTRACT DEVICE COMPONENTS LIBRARY
+
+ */
+
+
+#include <algorithm>
+#include <concepts>
+#include <ranges>
+
+#include "adc_traits.h"
+#include "adc_utils.h"
+
+namespace adc
+{
+
+/*                          SERIALIZATION/DESERIALIZATION PROCESS ERROR                            */
+
+template <typename T>
+concept adc_serialization_error_c = std::default_initializable<T> && (std::convertible_to<T, bool> || requires {
+                                        (bool)T() == false;  // default constucted value must be a "non-error"!
+                                    });
+
+// default
+typedef std::error_code adc_serialization_error_t;
+
+/*                          SERIALIZATION/DESERIALIZATION PROCESS TUNING PARAMETERS                            */
+
+
+// delimiter between items of serializing values sequence
+static constexpr std::string_view adc_SERIALIZING_DEFAULT_SEQ_DELIMITER{";"};
+
+// delimiter between items of aggregative (multi-element) serializing value
+static constexpr std::string_view adc_SERIALIZING_DEFAULT_ELEM_DELIMITER{","};
+
+
+template <typename T>
+concept adc_serialization_params_c = std::copyable<T> && requires(T t) {
+    // delimiter between items of serializing values sequence
+    requires traits::adc_output_char_range<decltype(t.elem_delim)>;
+
+    // delimiter between items of aggregative (multi-element) serializing value
+    requires traits::adc_output_char_range<decltype(t.seq_delim)>;
+
+    // a format string for std::chrono::time_point types
+    requires traits::adc_output_char_range<decltype(t.timepoint_format)>;
+};
+
+
+// default serializatio/deserialization process parameters type
+struct adc_serialization_params_t {
+    std::string elem_delim{adc_SERIALIZING_DEFAULT_ELEM_DELIMITER};
+    std::string seq_delim{adc_SERIALIZING_DEFAULT_SEQ_DELIMITER};
+    std::string timepoint_format{"{:%FT%T}"};
+};
+
+
+
+/*                          SERIALIZER/DESERIALIZER CONCEPTS                            */
+
+template <adc_serialization_error_c RetT>
+struct adc_serializer_interface_t {
+    virtual ~adc_serializer_interface_t() = default;
+
+    typedef RetT error_t;
+
+    template <std::derived_from<adc_serializer_interface_t> SelfT, traits::adc_output_char_range R, typename ValueT>
+    RetT operator()(this SelfT&& self, R& output, ValueT const& value)
+    {
+        return std::forward<SelfT>(self)(output, value);
+    }
+
+    template <std::derived_from<adc_serializer_interface_t> SelfT, traits::adc_output_char_range R, typename ValueT>
+    RetT operator()(this SelfT&& self, R& output, ValueT const& value, adc_serialization_params_c auto const& params)
+    {
+        return std::forward<SelfT>(self)(output, value, params);
+    }
+
+protected:
+    adc_serializer_interface_t() = default;
+};
+
+
+template <typename T>
+concept adc_serializer_c =
+    std::derived_from<T, adc_serializer_interface_t<typename T::error_t>> && requires(T t, const T t_const) {
+        // static const variable with name of the serializer
+        requires std::formattable<decltype(T::serializerName), char> && std::is_const_v<decltype(T::serializerName)>;
+    };
+
+
+
+template <adc_serialization_error_c RetT>
+struct adc_deserializer_interface_t {
+    virtual ~adc_deserializer_interface_t() = default;
+
+    typedef RetT error_t;
+
+    template <std::derived_from<adc_deserializer_interface_t> SelfT, traits::adc_input_char_range R, typename ValueT>
+    RetT operator()(this SelfT&& self, R const& input, ValueT& value)
+    {
+        return std::forward<SelfT>(self)(input, value);
+    }
+
+    template <std::derived_from<adc_deserializer_interface_t> SelfT, traits::adc_input_char_range R, typename ValueT>
+    RetT operator()(this SelfT&& self, R const& input, ValueT& value, adc_serialization_params_c auto& params)
+    {
+        return std::forward<SelfT>(self)(input, value, params);
+    }
+
+protected:
+    adc_deserializer_interface_t() = default;
+};
+
+
+template <typename T>
+concept adc_deserializer_c =
+    std::derived_from<T, adc_deserializer_interface_t<typename T::error_t>> && requires(T t, const T t_const) {
+        // static const variable with name of the deserializer
+        requires std::formattable<decltype(T::deserializerName), char> &&
+                     std::is_const_v<decltype(T::deserializerName)>;
+    };
+
+}  // namespace adc
+
+
+
+/*                          BASIC IMPLEMENTATION OF SERIALIZER AND DESERIALIZER CLASSES                            */
+
+namespace adc
+{
+
+enum class AdcSerializerErrorCode : int { ERROR_OK, ERROR_UNDERLYING_SERIALIZER };
+
+enum class AdcDeserializerErrorCode : int { ERROR_OK, ERROR_UNDERLYING_DESERIALIZER, ERROR_INVALID_SERIALIZED_VALUE };
+
+}  // namespace adc
+
+
+namespace std
+{
+
+template <>
+class is_error_code_enum<adc::AdcSerializerErrorCode> : public true_type
+{
+};
+
+template <>
+class is_error_code_enum<adc::AdcDeserializerErrorCode> : public true_type
+{
+};
+
+}  // namespace std
+
+
+namespace adc
+{
+
+// error category
+struct AdcSerializerCategory : public std::error_category {
+    AdcSerializerCategory() : std::error_category() {}
+
+    const char* name() const noexcept
+    {
+        return "Adc-SERIALIZER-ERR-CATEGORY";
+    }
+
+    std::string message(int ec) const
+    {
+        AdcSerializerErrorCode err = static_cast<AdcSerializerErrorCode>(ec);
+
+        switch (err) {
+            case AdcSerializerErrorCode::ERROR_OK:
+                return "OK";
+            case AdcSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER:
+                return "error returned by underlying serializer";
+            default:
+                return "UNKNOWN";
+        }
+    }
+
+    static const AdcSerializerCategory& get()
+    {
+        static const AdcSerializerCategory constInst;
+        return constInst;
+    }
+};
+
+
+// error category
+struct AdcDeserializerCategory : public std::error_category {
+    AdcDeserializerCategory() : std::error_category() {}
+
+    const char* name() const noexcept
+    {
+        return "Adc-DESERIALIZER-ERR-CATEGORY";
+    }
+
+    std::string message(int ec) const
+    {
+        AdcDeserializerErrorCode err = static_cast<AdcDeserializerErrorCode>(ec);
+
+        switch (err) {
+            case AdcDeserializerErrorCode::ERROR_OK:
+                return "OK";
+            case AdcDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER:
+                return "error returned by underlying deserializer";
+            case AdcDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE:
+                return "invalid serialized value";
+            default:
+                return "UNKNOWN";
+        }
+    }
+
+    static const AdcDeserializerCategory& get()
+    {
+        static const AdcDeserializerCategory constInst;
+        return constInst;
+    }
+};
+
+
+
+/*    BASE SERIALIZER CLASS (FOR IMPLEMENTATIONS BELOW)    */
+
+struct AdcSerializerBase : adc_serializer_interface_t<adc_serialization_error_t> {
+    virtual ~AdcSerializerBase() = default;
+
+    using typename adc_serializer_interface_t<adc_serialization_error_t>::error_t;
+
+protected:
+    AdcSerializerBase() = default;
+
+    static void addElemDelimiter(traits::adc_output_char_range auto& output,
+                                 adc_serialization_params_c auto const& params)
+    {
+        std::format_to(std::back_inserter(output), "{}", params.elem_delim);
+    }
+
+
+    static void addSeqDelimiter(traits::adc_output_char_range auto& output,
+                                adc_serialization_params_c auto const& params)
+    {
+        std::format_to(std::back_inserter(output), "{}", params.seq_delim);
+    }
+
+
+    template <typename VT, typename R>
+        requires(std::ranges::input_range<R> && std::same_as<VT, std::ranges::range_value_t<R>>)
+    static error_t serializeRange(adc_serializer_c auto& sr,
+                                  R const& r,
+                                  traits::adc_output_char_range auto& output,
+                                  adc_serialization_params_c auto const& params)
+    {
+        size_t i = 0, N = std::ranges::size(r);
+
+        for (auto const& el : r) {
+            auto err = sr(output, el, params);
+            if (err) {
+                return adc_deduced_err(err, AdcSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER);
+            }
+            if (++i < N) {
+                // AdcSerializerBase::addSeqDelimiter(output, params);
+                AdcSerializerBase::addElemDelimiter(output, params);
+            }
+        }
+
+        return AdcSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+/*    BASE DESERIALIZER CLASS (FOR IMPLEMENTATIONS BELOW)    */
+
+struct AdcDeserializerBase : adc_deserializer_interface_t<adc_serialization_error_t> {
+    using typename adc_deserializer_interface_t<adc_serialization_error_t>::error_t;
+
+    virtual ~AdcDeserializerBase() = default;
+
+
+protected:
+    AdcDeserializerBase() = default;
+
+    //
+    // empty == true, if the 'input' is empty or if all elements consist of only spaces
+    //
+    static std::vector<std::string_view> splitValueIntoElements(traits::adc_input_char_range auto const& input,
+                                                                adc_serialization_params_c auto const& params,
+                                                                bool& empty)
+    {
+        static_assert(std::ranges::contiguous_range<decltype(input)>, "NOT IMPLEMENTED FOR NON-CONTIGUIUS RANGES!!!");
+
+        std::vector<std::string_view> res;
+
+        if (std::ranges::size(input)) {
+            empty = true;
+
+            std::ranges::for_each(std::views::split(input, params.elem_delim), [&res, &empty](auto const& el) {
+                std::back_inserter(res) = utils::AdcTrimSpacesView<std::string_view, std::string_view>(
+                    std::string_view{el.begin(), el.end()});
+                if (empty && res.back().size()) {
+                    empty = false;
+                }
+            });
+        } else {
+            empty = true;
+        }
+
+        return res;
+    }
+
+
+    template <typename VT, std::ranges::output_range<VT> R, typename... DeserParamsT>
+    static error_t deserializingRange(adc_deserializer_c auto& dsr,
+                                      traits::adc_input_char_range auto const& input,
+                                      R& r,
+                                      adc_serialization_params_c auto const& params)
+    {
+        if (std::ranges::size(input) == 0) {  // ignore an empty input, just return empty range?!!
+            r = R{};
+            return AdcDeserializerErrorCode::ERROR_OK;
+        }
+
+        // auto r_str = std::views::split(input, params.seq_delim);
+        auto r_str = std::views::split(input, params.elem_delim);
+        VT val;
+
+        auto it = r.begin();
+        for (auto const& el : r_str) {
+            // auto err = dsr(el, val, std::forward<DeserParamsT>(params)...);
+            auto err = dsr(el, val, params);
+            if (err) {
+                return adc_deduced_err(err, AdcDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER);
+            }
+
+            if (it == r.end()) {
+                if constexpr (!traits::adc_fixed_size_range<R>) {
+                    std::back_inserter(r) = val;
+                    it = r.end();
+                }
+            } else {
+                *it = val;
+                ++it;
+            }
+        }
+
+        return AdcDeserializerErrorCode::ERROR_OK;
+    }
+};
+
+
+/*                          MAIN (FALLBACK) TEMPLATED IMPLEMENTATION OF SERIALIZER/DESERIALIZER */
+
+template <typename VT>
+struct AdcSerializer : AdcSerializerBase {
+    constexpr static std::string_view serializerName{"ADC-FALLBACK-SERIALIZER"};
+
+    template <adc_serialization_params_c ParamsT = adc_serialization_params_t>
+    error_t operator()(traits::adc_output_char_range auto& output,
+                       VT const& value,
+                       ParamsT const& params = adc_serialization_params_t{})
+    {
+        if constexpr (std::convertible_to<VT, std::string>) {
+            std::string s = value;
+            std::ranges::copy(s, std::back_inserter(output));
+        } else if constexpr (std::ranges::range<VT>) {
+            using value_t = std::remove_cv_t<std::ranges::range_value_t<VT>>;
+
+            // special range (character sequence)
+            if constexpr (std::same_as<value_t, char>) {
+                std::ranges::copy(value, std::back_inserter(output));
+            } else {
+                AdcSerializer<value_t> sr;
+
+                return AdcSerializerBase::serializeRange<value_t>(sr, value, output, params);
+            }
+        } else if constexpr (traits::adc_tuple_like<VT>) {
+            return [&output, &params]<size_t I = 0>(this auto& self, VT& tp) -> error_t {
+                if constexpr (I < (std::tuple_size_v<VT> - 1)) {
+                    auto err = AdcSerializer<std::tuple_element_t<I, VT>>{}(output, std::get<I>(tp), params);
+                    if (err) {
+                        return AdcSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER;
+                    }
+
+                    AdcSerializerBase::addElemDelimiter(output, params);
+
+                    return self.template operator()<I + 1>(tp);
+                } else if constexpr (I < (std::tuple_size_v<VT> - 1)) {  // the last element
+                    auto err = AdcSerializer<std::tuple_element_t<I, VT>>{}(output, std::get<I>(tp), params);
+                    if (err) {
+                        return AdcSerializerErrorCode::ERROR_UNDERLYING_SERIALIZER;
+                    }
+
+                    return AdcSerializerErrorCode::ERROR_OK;
+                }
+            }(value);
+        } else if constexpr (traits::adc_time_point_c<VT>) {
+            std::string_view fmt{params.timepoint_format};
+            std::vformat_to(std::back_inserter(output), fmt, std::make_format_args(value));
+        } else if constexpr (traits::adc_time_duration_c<VT>) {
+            std::format_to(std::back_inserter(output), "{}", value.count());
+        } else if constexpr (std::formattable<VT, char>) {
+            std::format_to(std::back_inserter(output), "{}", value);
+        } else {
+            static_assert(false, "UNSUPPORTED TYPE!!!");
+        }
+
+        return AdcSerializerErrorCode::ERROR_OK;
+    }
+};
+
+
+template <typename VT>
+struct AdcDeserializer : AdcDeserializerBase {
+    static constexpr std::string_view deserializerName{"ADC-FALLBACK-DESERIALIZER"};
+
+    virtual ~AdcDeserializer() = default;
+
+
+    template <adc_serialization_params_c ParamsT = adc_serialization_params_t>
+    error_t operator()(traits::adc_input_char_range auto const& input,
+                       VT& value,
+                       ParamsT const& params = adc_serialization_params_t{})
+    {
+        if constexpr (std::is_arithmetic_v<VT>) {
+            auto v = adc::utils::AdcFromChars<VT>(utils::AdcTrimSpaces(input));
+            if (!v.has_value()) {
+                return AdcDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE;
+            }
+
+            value = v.value();
+        } else if constexpr (adc::traits::adc_output_char_range<VT>) {
+            VT r;
+            if constexpr (traits::adc_fixed_size_range<VT>) {
+                size_t N =
+                    std::ranges::size(r) <= std::ranges::size(input) ? std::ranges::size(r) : std::ranges::size(input);
+
+                for (size_t i = 0; i < N; ++i) {
+                    r[i] = input[i];
+                }
+                if (std::ranges::size(r) > N) {
+                    for (size_t i = N; i < std::ranges::size(r); ++i) {
+                        r[i] = '\0';
+                    }
+                }
+            } else {
+                std::ranges::copy(input, std::back_inserter(r));
+            }
+
+            value = r;
+        } else if constexpr (std::ranges::range<VT>) {
+            using el_t = std::ranges::range_value_t<VT>;
+
+            static_assert(std::ranges::output_range<VT, el_t>, "INVALID RANGE TYPE!!!");
+
+            // no reference or constants allowed
+            static_assert(!(std::is_reference_v<el_t> || std::is_const_v<el_t>), "INVALID RANGE ELEMENT TYPE!!!");
+
+            AdcDeserializer<el_t> dsr;
+            return deserializingRange<el_t>(dsr, input, value, params);
+        } else if constexpr (traits::adc_tuple_like<VT>) {
+            bool empty;
+            auto elems = splitValueIntoElements(input, params, &empty);
+            if (empty) {
+                value = VT{};
+            } else {
+                return [&input, &params, &elems]<size_t I = 0>(this auto& self, VT& tp) {
+                    if constexpr (I < std::tuple_size_v<VT>) {
+                        if (I < elems.size()) {
+                            auto err =
+                                AdcDeserializer<std::tuple_element_t<I, VT>>{}(elems[I], std::get<I>(tp), params);
+                            if (err) {
+                                return AdcDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER;
+                            }
+
+                            return self.template operator()<I + 1>(tp);
+                        } else {
+                            return AdcDeserializerErrorCode::ERROR_OK;
+                        }
+                    }
+
+                    return AdcDeserializerErrorCode::ERROR_OK;
+                }(value);
+            }
+
+        } else if constexpr (traits::adc_time_point_c<VT>) {
+            std::istringstream ist{utils::AdcTrimSpaces<std::string>(input)};
+            std::chrono::from_stream(ist, params.timepoint_format.c_str(), value);
+            if (ist.fail()) {
+                return AdcDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE;
+            }
+        } else if constexpr (traits::adc_time_duration_c<VT>) {
+            typename VT::rep vd;
+
+            AdcDeserializer<typename VT::rep> dsr;
+
+            auto err = dsr(utils::AdcTrimSpaces(input), vd, params);
+            if (err) {
+                return adc_deduced_err(err, AdcDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER);
+            }
+
+            value = VT{vd};
+        } else {
+            static_assert(false, "UNSUPPORTED VALUE TYPE!!!");
+        }
+
+
+        return AdcDeserializerErrorCode::ERROR_OK;
+    }
+};
+
+
+
+}  // namespace adc

common/adc_traits.h

@@ -86,6 +86,17 @@ struct adc_char_identity {
     }
 };
 
+
+// std::array, std::span(v_t, N), std::tuple
+template <typename R>
+concept adc_fixed_size_range = std::ranges::range<R> && requires { std::tuple_size<std::remove_cvref_t<R>>::value; };
+
+// non-resizable ranges
+template <typename R>
+concept adc_non_resizable_range = std::ranges::range<R> && !requires(R r, std::size_t n) { r.resize(n); };
+
+
+
 // deduce returned type of callable
 // template <typename T>
 // using adc_retval_t = std::invoke_result_t<std::remove_cvref_t<T>>;
@@ -270,6 +281,13 @@ using adc_common_duration_t = adc_duration_common_type_t<std::chrono::nanosecond
                                                          std::chrono::years>;
 
 
+
+template <typename T>
+concept adc_time_point_c = requires {
+    []<typename ClockT, typename DurT>(std::type_identity<std::chrono::time_point<ClockT, DurT>>) {
+    }(std::type_identity<std::remove_cvref_t<T>>());
+};
+
 // concept for hashable types
 template <typename T>
 concept adc_hashable_c = requires(T t) {

common/adc_utils.h

@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <charconv>
+#include <iomanip>
 #include <iostream>
 #include <limits>
 #include <mutex>

tart

@@ -0,0 +1,464 @@
+#pragma once
+
+/*
+
+ABSTRACT DEVICE COMPONENTS LIBRARY
+
+*/
+
+#include <filesystem>
+#include <functional>
+#include <list>
+#include <set>
+#include <unordered_map>
+
+#if __has_include(<unistd.h>)  // POSIX
+#define FORK_EXISTS 1
+#include <sys/stat.h>
+#include <unistd.h>
+#include <cerrno>
+#endif
+
+
+#include "../common/adc_utils.h"
+#include "adc_net_concepts.h"
+
+
+namespace adc
+{
+
+
+/*  SOME USEFULL PRIVITIVES  */
+
+
+// A generic implementation of POSIX OS daemon
+class AdcPosixGenericDaemon
+{
+public:
+    virtual ~AdcPosixGenericDaemon() = default;
+
+    // run server as daemon (still only on POSIX OSes)
+    void daemonize()
+    {
+        daemonizePrepare();
+
+// reference implementation of forking for POSIX OSes
+#ifdef FORK_EXISTS
+        // get TEMP directory in OS
+
+        auto tmp_path = std::filesystem::temp_directory_path();
+        if (tmp_path.empty()) {
+            tmp_path = std::filesystem::current_path().root_path();
+        }
+
+        if (pid_t pid = fork()) {
+            if (pid > 0) {
+                exit(0);
+            } else {
+                throw std::system_error(errno, std::generic_category(), "CANNOT FORK 1-STAGE");
+            }
+        }
+
+        if (setsid() == -1) {
+            throw std::system_error(errno, std::generic_category(), "CANNOT FORK SETSID");
+        }
+
+        std::filesystem::current_path(tmp_path);
+
+        umask(0);
+
+        if (pid_t pid = fork()) {
+            if (pid > 0) {
+                exit(0);
+            } else {
+                throw std::system_error(errno, std::generic_category(), "CANNOT FORK 2-STAGE");
+            }
+        }
+
+        close(0);
+        close(1);
+        close(2);
+
+#endif
+        daemonizeFinalize();
+    }
+
+protected:
+    virtual void daemonizePrepare() = 0;
+    virtual void daemonizeFinalize() = 0;
+};
+
+
+// a basic network session manager (basic start and stop functionality)
+
+class AdcNetSessionManager
+{
+public:
+    virtual ~AdcNetSessionManager() = default;
+
+protected:
+    AdcNetSessionManager() = default;
+
+    AdcNetSessionManager(const AdcNetSessionManager&) = delete;
+    AdcNetSessionManager(AdcNetSessionManager&& other)
+    {
+        moveInstFunc(&other, this);
+    }
+
+    AdcNetSessionManager& operator=(const AdcNetSessionManager&) = delete;
+    AdcNetSessionManager& operator=(AdcNetSessionManager&& other)
+    {
+        moveInstFunc(&other, this);
+
+        return *this;
+    };
+
+
+    template <interfaces::adc_netsession_c SessionT>
+    constexpr static bool anySessionPredicate(const typename SessionT::netsession_ident_t&)
+    {
+        return true;
+    }
+
+    // started sessions weak pointers
+    template <interfaces::adc_netsession_c SessionT>
+    static inline std::unordered_map<const AdcNetSessionManager*, std::list<std::weak_ptr<SessionT>>> _serverSessions{};
+
+    std::vector<std::function<bool(const AdcNetSessionManager*)>> _stopSessionFunc;
+    std::vector<std::function<void(const AdcNetSessionManager*, const AdcNetSessionManager*)>> _moveCtorFunc;
+
+    template <interfaces::adc_netsession_c SessionT>
+    void startSession(std::shared_ptr<SessionT>& sess_ptr)
+    {
+        auto it = _serverSessions<SessionT>[this].end();
+        it = _serverSessions<SessionT>[this].emplace(it, sess_ptr);
+        sess_ptr->start();
+
+        _stopSessionFunc.emplace_back([it](const AdcNetSessionManager* inst) {
+            if (!it->expired()) {  // session is still existing
+                auto sess = it->lock();
+                sess->stop();
+                _serverSessions<SessionT>[inst].erase(it);
+                return true;
+            } else {
+                return false;
+            }
+        });
+
+
+        // define move-function only once per SessionT!
+        if (_serverSessions<SessionT>[this].size() == 1) {
+            _moveCtorFunc.emplace_back(
+                [](const AdcNetSessionManager* new_instance, const AdcNetSessionManager* from_inst) {
+                    _serverSessions<SessionT>[new_instance] = std::move(_serverSessions<SessionT>[from_inst]);
+                });
+        }
+    }
+
+
+    template <interfaces::adc_netsession_c SessionT,
+              std::predicate<typename SessionT::netsession_ident_t> PredT = decltype(anySessionPredicate<SessionT>)>
+    size_t stopSessions(PredT&& comp_func = anySessionPredicate<SessionT>())
+    {
+        size_t N = 0;
+
+        std::set<std::weak_ptr<SessionT>> remove_wptr;
+
+        for (auto& wptr : _serverSessions<SessionT>[this]) {
+            if (std::shared_ptr<SessionT> sptr = wptr.lock()) {
+                if constexpr (std::same_as<PredT, decltype(anySessionPredicate<SessionT>)>) {
+                    sptr->stop();
+                    remove_wptr.emplace(wptr);
+                    ++N;
+                } else {
+                    if (std::forward<PredT>(comp_func)(sptr->ident())) {
+                        sptr->stop();
+                        remove_wptr.emplace(wptr);
+                        ++N;
+                    }
+                }
+            } else {  // remove already stopped sessions?!!
+                remove_wptr.emplace(wptr);
+            }
+        }
+
+        for (auto& wptr : remove_wptr) {
+            _serverSessions<SessionT>[this].erase(wptr);
+        }
+
+
+        return N;
+    }
+
+
+    size_t stopAllSessions()
+    {
+        size_t N = 0;
+
+        for (auto& func : _stopSessionFunc) {
+            func(this) ? ++N : 0;
+        }
+
+        _stopSessionFunc.clear();
+        _moveCtorFunc.clear();  // there are nothing to move after stopping of all sessions
+
+        return N;
+    }
+
+
+    void moveInstFunc(const AdcNetSessionManager* to, const AdcNetSessionManager* from)
+    {
+        if (from != to) {
+            for (auto& func : _moveCtorFunc) {
+                func(to, from);
+            }
+
+            _stopSessionFunc = std::move(from->_stopSessionFunc);
+            _moveCtorFunc = std::move(from->_moveCtorFunc);
+        }
+    }
+};
+
+
+static_assert(interfaces::adc_logger_c<utils::AdcOstreamLogger<>>, "!!!!!");
+
+
+
+/*  very generic network server  */
+
+template <typename IdentT = std::string, interfaces::adc_logger_c LoggerT = utils::AdcOstreamLogger<char>>
+class AdcGenericNetServer : public AdcPosixGenericDaemon, public AdcNetSessionManager, public LoggerT
+{
+public:
+    typedef IdentT server_ident_t;
+    typedef LoggerT logger_t;
+
+    template <typename... LoggerCtorArgTs>
+    AdcGenericNetServer(const server_ident_t& id, LoggerCtorArgTs&&... ctor_args)
+        : _serverIdent(id), LoggerT(std::forward<LoggerCtorArgTs>(ctor_args)...)
+    {
+        if constexpr (traits::formattable<IdentT>) {
+            logInfo("Create ADC generic network server with ID: {} (addr = {}, thread = {})", id, (void*)this,
+                    utils::AdcThisThreadId());
+        } else {
+            logInfo("Create ADC generic network server (addr = {}, thread = {})", (void*)this,
+                    utils::AdcThisThreadId());
+        }
+    }
+
+
+    AdcGenericNetServer(const AdcGenericNetServer&) = delete;
+    AdcGenericNetServer(AdcGenericNetServer&& other)
+        : AdcPosixGenericDaemon(std::move(other)), AdcNetSessionManager(std::move(other)), LoggerT(std::move(other))
+    {
+        logDebug("Move ADC server class: this = {}, target = {}", (void*)this, (void*)&other);
+
+        if (this == &other) {
+            return;
+        }
+
+        _serverIdent = std::move(other._serverIdent);
+        _stopListenFunc = std::move(other._stopListenFunc);
+
+        for (auto& func : other._moveCtorFunc) {
+            func(&other, this);
+        }
+
+        _moveCtorFunc = std::move(other._moveCtorFunc);
+    }
+
+    virtual ~AdcGenericNetServer()
+    {
+        if constexpr (traits::formattable<IdentT>) {
+            logInfo("Delete ADC generic network server with ID: {} (addr = {}, thread = {})", _serverIdent, (void*)this,
+                    utils::AdcThisThreadId());
+        } else {
+            logInfo("Delete ADC generic network server (addr = {}, thread = {})", (void*)this,
+                    utils::AdcThisThreadId());
+        }
+    };
+
+    AdcGenericNetServer& operator=(const AdcGenericNetServer&) = delete;
+    AdcGenericNetServer& operator=(AdcGenericNetServer&& other)
+    {
+        logDebug("Assign-move ADC server class: this = {}, target = {}", (void*)this, (void*)&other);
+
+        if (this != &other) {
+            AdcPosixGenericDaemon::operator=(std::move(other));
+            AdcNetSessionManager::operator=(std::move(other));
+
+            _serverIdent = std::move(other._serverIdent);
+            _stopListenFunc = std::move(other._stopListenFunc);
+
+            for (auto& func : other._moveCtorFunc) {
+                func(&other, this);
+            }
+
+            _moveCtorFunc = std::move(other._moveCtorFunc);
+        }
+
+        return *this;
+    }
+
+    virtual server_ident_t ident() const
+    {
+        return _serverIdent;
+    }
+
+    // start accepting remote connections, create and start given network session
+    // It must be assumed that this is asynchronous operation!!!
+    template <interfaces::adc_netsession_c SessionT, typename... AcceptorCtorArgTs>
+    void start(SessionT::netsession_ident_t id, SessionT::netsession_ctx_t sess_ctx, AcceptorCtorArgTs&&... ctor_args)
+        requires traits::adc_hashable_c<typename SessionT::netsession_ident_t>
+    {
+        logDebug("Call {}", __PRETTY_FUNCTION__);
+
+        if (!_isListening<SessionT>[this][id]) {
+            auto acceptor = std::make_shared<typename SessionT::netservice_t::acceptor_t>(
+                std::forward<AcceptorCtorArgTs>(ctor_args)...);
+
+            _stopListenFunc.emplace_back([acceptor, id](const AdcGenericNetServer* inst) {
+                std::error_code ec;
+                acceptor->close(ec);
+
+                _isListening<SessionT>[inst][id] = false;
+            });
+
+            if constexpr (traits::formattable<typename SessionT::netsession_ident_t>) {
+                logInfo(
+                    "Start listening for client connections at <{}> endpoint (session ID: {}, server addr = {}, thread "
+                    "= {})",
+                    acceptor->localEndpoint(), id, (void*)this, utils::AdcThisThreadId());
+            } else {
+                logInfo("Start listening for client connections at <{}> endpoint (server addr = {}, thread = {})",
+                        acceptor->localEndpoint(), (void*)this, utils::AdcThisThreadId());
+            }
+
+            doAccept<SessionT>(acceptor, std::move(id), std::move(sess_ctx));
+        }
+
+        // only once per SessionT
+        if (_isListening<SessionT>[this].size() == 1) {
+            _moveCtorFunc.emplace_back(
+                [](const AdcGenericNetServer* new_instance, const AdcGenericNetServer* from_inst) {
+                    _isListening<SessionT>[new_instance] = std::move(_isListening<SessionT>[from_inst]);
+                });
+        }
+    };
+
+
+    template <interfaces::adc_netsession_c SessionT>
+    bool isListening(const typename SessionT::netsession_ident_t& id) const
+    {
+        return _isListening<SessionT>[this][id];
+    }
+
+    virtual void start() = 0;
+
+    virtual void stop()
+    {
+        for (auto& func : _stopListenFunc) {
+            func(this);
+        }
+
+        _stopListenFunc.clear();
+
+        stopAllSessions();
+    };
+
+
+    void setAcceptTimeout(const traits::adc_time_duration_c auto& timeout)
+    {
+        _acceptTimeout = std::chrono::duration_cast<decltype(_acceptTimeout)>(timeout);
+    }
+
+
+    auto getAcceptTimeout() const
+    {
+        return _acceptTimeout;
+    }
+
+
+    // helper methods for logging
+
+    template <traits::formattable... Ts>
+    void logMessage(LoggerT::loglevel_t level, std::format_string<Ts...> fmt, Ts&&... args)
+    {
+        LoggerT::logMessage(level, std::format(fmt, std::forward<Ts>(args)...));
+    }
+
+    template <traits::formattable... Ts>
+    void logInfo(std::format_string<Ts...> fmt, Ts&&... args)
+    {
+        LoggerT::logInfo(std::format(fmt, std::forward<Ts>(args)...));
+    }
+
+    template <traits::formattable... Ts>
+    void logDebug(std::format_string<Ts...> fmt, Ts&&... args)
+    {
+        LoggerT::logDebug(std::format(fmt, std::forward<Ts>(args)...));
+    }
+
+    template <traits::formattable... Ts>
+    void logError(std::format_string<Ts...> fmt, Ts&&... args)
+    {
+        LoggerT::logError(std::format(fmt, std::forward<Ts>(args)...));
+    }
+
+protected:
+    std::chrono::seconds _acceptTimeout = std::chrono::seconds::max();
+
+    // template <interfaces::adc_netsession_c SessionT>
+    // inline static std::unordered_map<const AdcGenericNetServer*, bool> _isListening{};
+    template <interfaces::adc_netsession_c SessionT>
+    inline static std::unordered_map<const AdcGenericNetServer*,
+                                     std::unordered_map<typename SessionT::netsession_ident_t, bool>>
+        _isListening{};
+
+    std::vector<std::function<void(const AdcGenericNetServer*)>> _stopListenFunc;
+    std::vector<std::function<void(const AdcGenericNetServer*, const AdcGenericNetServer*)>> _moveCtorFunc;
+
+    server_ident_t _serverIdent;
+
+    template <typename SessionT, typename AT, typename IDT, typename CTXT>
+    void doAccept(std::shared_ptr<AT> acceptor, IDT id, CTXT sess_ctx)
+    {
+        acceptor->asyncAccept(
+            [acceptor, id = std::move(id), sess_ctx = std::move(sess_ctx), this](
+                auto ec, typename SessionT::netservice_t srv) mutable {
+                if (!ec) {
+                    logInfo(
+                        "Client connection is succesfully accepted! Client endpoint: {} (server addr = {}, thread = "
+                        "{})",
+                        srv.remoteEndpoint(), (void*)this, utils::AdcThisThreadId());
+
+                    auto sess = std::make_shared<SessionT>(id, std::move(srv), sess_ctx);
+                    startSession(sess);
+
+                    _isListening<SessionT>[this][id] = true;
+                    doAccept<SessionT>(acceptor, std::move(id), std::move(sess_ctx));
+                } else {
+                    this->logError("Cannot start accepting connection: {}",
+                                   SessionT::netservice_t::formattableError(ec));
+
+                    _isListening<SessionT>[this][id] = false;
+                }
+            },
+            _acceptTimeout);
+    }
+};
+
+
+namespace interfaces
+{
+
+template <typename T>
+concept adc_generic_netserver_c = requires {
+    typename T::server_ident_t;
+    requires std::derived_from<T, adc::AdcGenericNetServer<typename T::server_ident_t>>;
+};
+
+}  // namespace interfaces
+
+
+}  // namespace adc