c++-virtan tuned and test client updated

c++-virtan/.gitignore

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+/build/
+/.idea/

c++-virtan/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.0)
+project(server)
+
+set(Boost_USE_STATIC_LIBS ON)
+set(Boost_USE_MULTITHREADED ON)
+find_package(Boost REQUIRED COMPONENTS system date_time chrono regex program_options)
+find_package(Threads REQUIRED)
+
+set(libraries )
+list(APPEND libraries ${Boost_LIBRARIES})
+list(APPEND libraries ${Boost_LIBRARIES} Threads::Threads)
+if(WIN32)
+    list(APPEND libraries "ws2_32" "mswsock")
+endif()
+
+if(NOT Boost_USE_STATIC_LIBS)
+    list(APPEND compile_definitions "BOOST_ALL_DYN_LINK")
+endif()
+if(WIN32)
+    list(APPEND compile_definitions
+        WIN32
+        WIN32_LEAN_AND_MEAN
+        WINVER=0x0501
+        _WIN32_WINNT=0x0501
+        _WIN32_WINDOWS=0x0501
+        _WIN32_IE=0x0600
+        _UNICODE
+        UNICODE
+        _WINSOCK_DEPRECATED_NO_WARNINGS)
+endif()
+
+if(MINGW)
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -municode")
+endif()
+
+add_executable(server "server.cc")
+target_compile_features(server PRIVATE cxx_std_11 cxx_auto_type)
+target_compile_definitions(server PRIVATE ${compile_definitions})
+target_include_directories(server PRIVATE ${Boost_INCLUDE_DIRS})
+target_link_libraries(server PRIVATE ${libraries})

c++-virtan/Dockerfile

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+FROM ubuntu:20.04 AS build
+
+RUN apt-get update && \
+    apt-get install -y --no-install-suggests --no-install-recommends \
+      ca-certificates \
+      curl \
+      git \
+      g++ \
+      make \
+      libstdc++-9-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+ENV CMAKE_HOME="/opt/cmake"
+
+ARG CMAKE_VERSION="3.18.4"
+
+RUN mkdir -p "${CMAKE_HOME}" && \
+    cmake_url="https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-Linux-x86_64.tar.gz" && \
+    echo "Downloading CMake ${CMAKE_VERSION} from ${cmake_url} to ${CMAKE_HOME}" && \
+    curl -jksSL "${cmake_url}" | tar -xzf - -C "${CMAKE_HOME}" --strip-components 1
+
+ENV PATH="${CMAKE_HOME}/bin:${PATH}" \
+    BOOST_HOME="/usr/lib/boost"
+
+ARG BOOST_VERSION="1.74.0"
+ARG BOOST_URL="https://dl.bintray.com/mabrarov/generic/boost"
+
+RUN mkdir -p "${BOOST_HOME}" && \
+    boost_archive_url="${BOOST_URL}/${BOOST_VERSION}/boost-${BOOST_VERSION}-x64-gcc$(gcc -dumpversion | sed -r 's/^([[:digit:]]+)(\..*)?$/\1/;t;d').tar.gz" && \
+    echo "Downloading Boost from ${boost_archive_url} to ${BOOST_HOME}" && \
+    curl --connect-timeout 300 --max-time 1800 --retry 10 --retry-delay 10 \
+      -jksSL "${boost_archive_url}" \
+      | tar -xz -C "${BOOST_HOME}" --strip-components 1
+
+ADD ["CMakeLists.txt", "server.cc", "/usr/src/cpp-virtan/"]
+
+RUN source_dir="/usr/src/cpp-virtan" && \
+    build_dir="${source_dir}/build" && \
+    mkdir -p "${build_dir}" && \
+    cmake \
+      -D CMAKE_SKIP_BUILD_RPATH=ON \
+      -D CMAKE_BUILD_TYPE=Release \
+      -D Boost_USE_MULTITHREADED=ON \
+      -D Boost_USE_STATIC_LIBS=ON \
+      -D Boost_NO_SYSTEM_PATHS=ON \
+      -D BOOST_INCLUDEDIR="${BOOST_HOME}/include" \
+      -D BOOST_LIBRARYDIR="${BOOST_HOME}/lib" \
+      -S "${source_dir}" \
+      -B "${build_dir}" && \
+    cmake --build "${build_dir}"
+
+FROM gcr.io/distroless/cc-debian10
+
+COPY --from=build ["/usr/src/cpp-virtan/build/server", "/opt/cpp-virtan/server"]
+
+ENTRYPOINT ["/opt/cpp-virtan/server"]
+
+CMD ["--help"]
+
+LABEL name="cpp-virtan"

c++-virtan/README.md

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+# Building
+
+## Requirements
+
+1. C++ toolchain (compiler, linker, standard C++ library)
+1. Make
+1. [CMake](https://cmake.org/)
+1. [Boost](https://www.boost.org/)
+
+## Steps to build
+
+Assuming current directory is directory where this file is located
+
+```bash
+cmake -D CMAKE_SKIP_BUILD_RPATH=ON -D CMAKE_BUILD_TYPE=Release .
+cmake --build .
+```
+
+# Docker image
+
+## Building
+
+### Requirements
+
+1. Docker 17.06+ for building
+1. Current directory is directory where this repository is cloned
+
+### Steps to build
+
+```bash
+docker build -t cpp-virtan c++-virtan
+```
+
+## Running with Docker
+
+```bash
+docker run --rm cpp-virtan $params
+```
+
+where `$params` are parameters passed to application