Merge pull request #4609 from wwylele/nuke-zmq

Reimplement scripting over plain UDP

.gitmodules

@@ -37,12 +37,6 @@
 [submodule "discord-rpc"]
     path = externals/discord-rpc
     url = https://github.com/discordapp/discord-rpc.git
-[submodule "externals/libzmq"]
-    path = externals/libzmq
-    url = https://github.com/zeromq/libzmq
-[submodule "externals/cppzmq"]
-    path = externals/cppzmq
-    url = https://github.com/zeromq/cppzmq
 [submodule "cpp-jwt"]
     path = externals/cpp-jwt
     url = https://github.com/arun11299/cpp-jwt.git

.travis/linux-mingw/docker.sh

@@ -5,7 +5,7 @@ cd /citra
 echo 'max_size = 3.0G' > "$HOME/.ccache/ccache.conf"
 
 mkdir build && cd build
-cmake .. -DCMAKE_TOOLCHAIN_FILE="$(pwd)/../CMakeModules/MinGWCross.cmake" -DUSE_CCACHE=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON -DENABLE_SCRIPTING=ON
+cmake .. -DCMAKE_TOOLCHAIN_FILE="$(pwd)/../CMakeModules/MinGWCross.cmake" -DUSE_CCACHE=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON
 make -j4
 
 echo "Tests skipped"

.travis/linux/docker.sh

@@ -3,7 +3,7 @@
 cd /citra
 
 mkdir build && cd build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/lib/ccache/gcc -DCMAKE_CXX_COMPILER=/usr/lib/ccache/g++ -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON -DENABLE_SCRIPTING=ON
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/lib/ccache/gcc -DCMAKE_CXX_COMPILER=/usr/lib/ccache/g++ -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON
 make -j4
 
 ctest -VV -C Release

.travis/macos/build.sh

@@ -7,7 +7,7 @@ export Qt5_DIR=$(brew --prefix)/opt/qt5
 export PATH="/usr/local/opt/ccache/libexec:$PATH"
 
 mkdir build && cd build
-cmake .. -DCMAKE_OSX_ARCHITECTURES="x86_64;x86_64h" -DCMAKE_BUILD_TYPE=Release -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON -DENABLE_SCRIPTING=ON
+cmake .. -DCMAKE_OSX_ARCHITECTURES="x86_64;x86_64h" -DCMAKE_BUILD_TYPE=Release -DENABLE_QT_TRANSLATION=ON -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON -DUSE_DISCORD_PRESENCE=ON
 make -j4
 
 ctest -VV -C Release

.travis/transifex/docker.sh

@@ -26,7 +26,7 @@ tx --version
 
 cd /citra
 mkdir build && cd build
-cmake .. -DENABLE_QT_TRANSLATION=ON -DGENERATE_QT_TRANSLATION=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_SDL2=OFF -DENABLE_SCRIPTING=OFF
+cmake .. -DENABLE_QT_TRANSLATION=ON -DGENERATE_QT_TRANSLATION=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_SDL2=OFF
 make translation
 cd ..
 

CMakeLists.txt

@@ -22,8 +22,6 @@ option(ENABLE_CUBEB "Enables the cubeb audio backend" ON)
 
 option(USE_DISCORD_PRESENCE "Enables Discord Rich Presence" OFF)
 
-option(ENABLE_SCRIPTING "Enables scripting support" OFF)
-
 if(NOT EXISTS ${PROJECT_SOURCE_DIR}/.git/hooks/pre-commit)
     message(STATUS "Copying pre-commit hook")
     file(COPY hooks/pre-commit
@@ -253,10 +251,6 @@ if (ENABLE_QT)
     endif()
 endif()
 
-if (ENABLE_SCRIPTING)
-    add_definitions(-DENABLE_SCRIPTING)
-endif()
-
 # Platform-specific library requirements
 # ======================================
 

dist/scripting/citra.py

@@ -1,22 +1,22 @@
-import zmq
 import struct
 import random
 import enum
+import socket
 
 CURRENT_REQUEST_VERSION = 1
 MAX_REQUEST_DATA_SIZE = 32
+MAX_PACKET_SIZE = 48
 
 class RequestType(enum.IntEnum):
     ReadMemory = 1,
     WriteMemory = 2
 
-CITRA_PORT = "45987"
+CITRA_PORT = 45987
 
 class Citra:
     def __init__(self, address="127.0.0.1", port=CITRA_PORT):
-        self.context = zmq.Context()
+        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        self.socket = self.context.socket(zmq.REQ)
+        self.address = address
-        self.socket.connect("tcp://" + address + ":" + port)
 
     def is_connected(self):
         return self.socket is not None
@@ -45,9 +45,9 @@ class Citra:
             request_data = struct.pack("II", read_address, temp_read_size)
             request, request_id = self._generate_header(RequestType.ReadMemory, len(request_data))
             request += request_data
-            self.socket.send(request)
+            self.socket.sendto(request, (self.address, CITRA_PORT))
 
-            raw_reply = self.socket.recv()
+            raw_reply = self.socket.recv(MAX_PACKET_SIZE)
             reply_data = self._read_and_validate_header(raw_reply, request_id, RequestType.ReadMemory)
 
             if reply_data:
@@ -77,9 +77,9 @@ class Citra:
             request_data += write_contents[:temp_write_size]
             request, request_id = self._generate_header(RequestType.WriteMemory, len(request_data))
             request += request_data
-            self.socket.send(request)
+            self.socket.sendto(request, (self.address, CITRA_PORT))
 
-            raw_reply = self.socket.recv()
+            raw_reply = self.socket.recv(MAX_PACKET_SIZE)
             reply_data = self._read_and_validate_header(raw_reply, request_id, RequestType.WriteMemory)
 
             if None != reply_data:

externals/CMakeLists.txt

@@ -100,98 +100,3 @@ if (ENABLE_WEB_SERVICE)
     add_library(cpp-jwt INTERFACE)
     target_include_directories(cpp-jwt INTERFACE ./cpp-jwt/include)
 endif()
-
-if (ENABLE_SCRIPTING)
-    # ZeroMQ
-    # libzmq includes its own clang-format target, which conflicts with the
-    # clang-format in Citra if libzmq is added as a subdirectory. An external
-    # project gets around this issue. Unfortunately, a lot of different
-    # configuration options are required for each different platform. An
-    # attempt was made to use CMake variables where possible, but some
-    # information necessarily had to be repeated. Hopefully there is not
-    # often a need to change anything.
-    if (MINGW)
-        if (${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Windows")
-            set(LIBZMQ_MAKE mingw32-make)
-            set(LIBZMQ_COMPILER "")
-            set(LIBZMQ_TOOLCHAIN_FILE "")
-        else()
-            set(LIBZMQ_MAKE make)
-            set(LIBZMQ_COMPILER -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER};-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER})
-            set(LIBZMQ_TOOLCHAIN_FILE -DCMAKE_TOOLCHAIN_FILE=${PROJECT_SOURCE_DIR}/CMakeModules/MinGWCross.cmake)
-        endif()
-        ExternalProject_Add(libzmq-external
-            SOURCE_DIR ./libzmq
-            CMAKE_ARGS -DWITH_PERF_TOOL=OFF;-DZMQ_BUILD_TESTS=OFF;-DENABLE_CPACK=OFF;-DCMAKE_MAKE_PROGRAM=${LIBZMQ_MAKE};-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE};${LIBZMQ_TOOLCHAIN_FILE};${LIBZMQ_COMPILER}
-            BUILD_COMMAND cmake --build ${CMAKE_CURRENT_BINARY_DIR}/libzmq-external-prefix/src/libzmq-external-build --target libzmq-static --config ${CMAKE_BUILD_TYPE}
-            GIT_REPOSITORY https://github.com/zeromq/libzmq
-            GIT_TAG v4.2.5
-            INSTALL_COMMAND "")
-    else()
-        if (MSVC)
-            set(LIBZMQ_COMPILER_FLAGS -DCMAKE_C_FLAGS=/GL-;-DCMAKE_CXX_FLAGS=/GL-)
-        else()
-            set(LIBZMQ_COMPILER_FLAGS "")
-        endif()
-        ExternalProject_Add(libzmq-external
-            SOURCE_DIR ./libzmq
-            CMAKE_ARGS -DCMAKE_MACOSX_RPATH=1;-DCMAKE_OSX_ARCHITECTURES=x86_64;-DWITH_PERF_TOOL=OFF;-DZMQ_BUILD_TESTS=OFF;-DENABLE_CPACK=OFF;-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE};${LIBZMQ_COMPILER_FLAGS}
-            BUILD_COMMAND cmake --build ${CMAKE_CURRENT_BINARY_DIR}/libzmq-external-prefix/src/libzmq-external-build --target libzmq-static --config ${CMAKE_BUILD_TYPE}
-            GIT_REPOSITORY https://github.com/zeromq/libzmq
-            GIT_TAG v4.2.5
-            INSTALL_COMMAND "")
-    endif()
-    set(LIBZMQ_DIR ${CMAKE_CURRENT_BINARY_DIR}/libzmq-external-prefix/src/libzmq-external-build/lib)
-    # On macOS, we need to build a fat static library containing both x86_64 and x86_64h, since macOS
-    # targets specify two architectures in their link command line ("-arch x86_64 -arch x86_64h").
-    if (APPLE)
-        ExternalProject_Add(libzmq-external-h
-            SOURCE_DIR ./libzmq-h
-            CMAKE_ARGS -DCMAKE_MACOSX_RPATH=1;-DCMAKE_OSX_ARCHITECTURES=x86_64h;-DWITH_PERF_TOOL=OFF;-DZMQ_BUILD_TESTS=OFF;-DENABLE_CPACK=OFF;-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-            BUILD_COMMAND cmake --build ${CMAKE_CURRENT_BINARY_DIR}/libzmq-external-h-prefix/src/libzmq-external-h-build --target libzmq-static --config ${CMAKE_BUILD_TYPE}
-            GIT_REPOSITORY https://github.com/zeromq/libzmq
-            GIT_TAG v4.2.5
-            INSTALL_COMMAND "")
-        set(LIBZMQ_H_DIR ${CMAKE_CURRENT_BINARY_DIR}/libzmq-external-h-prefix/src/libzmq-external-h-build/lib)
-
-        add_library(libzmq-external-imported STATIC IMPORTED GLOBAL)
-        add_library(libzmq-external-imported-h STATIC IMPORTED GLOBAL)
-        add_dependencies(libzmq-external-imported libzmq-external)
-        add_dependencies(libzmq-external-imported-h libzmq-external-h)
-    else()
-        add_library(libzmq STATIC IMPORTED GLOBAL)
-        add_dependencies(libzmq libzmq-external)
-    endif()
-    # Set up the imported target properties
-    if (MSVC)
-        set_target_properties(libzmq PROPERTIES IMPORTED_LOCATION ${LIBZMQ_DIR}/${CMAKE_BUILD_TYPE}/libzmq-v141-mt-s-4_2_5${CMAKE_STATIC_LIBRARY_SUFFIX})
-        set_target_properties(libzmq PROPERTIES IMPORTED_LINK_INTERFACE_LIBRARIES iphlpapi${CMAKE_STATIC_LIBRARY_SUFFIX})
-    else()
-        if (APPLE)
-            set_target_properties(libzmq-external-imported PROPERTIES IMPORTED_LOCATION ${LIBZMQ_DIR}/libzmq${CMAKE_STATIC_LIBRARY_SUFFIX})
-            set_target_properties(libzmq-external-imported-h PROPERTIES IMPORTED_LOCATION ${LIBZMQ_H_DIR}/libzmq${CMAKE_STATIC_LIBRARY_SUFFIX})
-        else()
-            set_target_properties(libzmq PROPERTIES IMPORTED_LOCATION ${LIBZMQ_DIR}/libzmq${CMAKE_STATIC_LIBRARY_SUFFIX})
-            if(MINGW)
-                set_target_properties(libzmq PROPERTIES IMPORTED_LINK_INTERFACE_LIBRARIES "ws2_32${CMAKE_STATIC_LIBRARY_SUFFIX};iphlpapi${CMAKE_STATIC_LIBRARY_SUFFIX}")
-            endif()
-        endif()
-    endif()
-    # On macOS, create the combined target
-    if (APPLE)
-        set(LIBZMQ_COMBINED_OUTPUT ${LIBZMQ_DIR}/libzmq_combined${CMAKE_STATIC_LIBRARY_SUFFIX})
-        add_custom_target(libzmq-combined COMMAND lipo -create ${LIBZMQ_DIR}/libzmq${CMAKE_STATIC_LIBRARY_SUFFIX} ${LIBZMQ_H_DIR}/libzmq${CMAKE_STATIC_LIBRARY_SUFFIX} -o ${LIBZMQ_COMBINED_OUTPUT}
-                                          BYPRODUCTS ${LIBZMQ_COMBINED_OUTPUT})
-        add_dependencies(libzmq-combined libzmq-external-imported libzmq-external-imported-h)
-        add_library(libzmq STATIC IMPORTED GLOBAL)
-        set_target_properties(libzmq PROPERTIES IMPORTED_LOCATION ${LIBZMQ_COMBINED_OUTPUT})
-        add_dependencies(libzmq libzmq-combined)
-    endif()
-    # C interface to ZeroMQ
-    add_library(libzmq-headers INTERFACE)
-    target_include_directories(libzmq-headers INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/libzmq/include)
-    # C++ interface to ZeroMQ
-    add_library(cppzmq-headers INTERFACE)
-    target_include_directories(cppzmq-headers INTERFACE ./cppzmq)
-    add_dependencies(cppzmq-headers libzmq)
-endif()

externals/cppzmq

@@ -1 +0,0 @@
-Subproject commit 6aa3ab686e916cb0e62df7fa7d12e0b13ae9fae6

externals/libzmq

@@ -1 +0,0 @@
-Subproject commit d062edd8c142384792955796329baf1e5a3377cd

src/core/CMakeLists.txt

@@ -423,6 +423,14 @@ add_library(core STATIC
     movie.h
     perf_stats.cpp
     perf_stats.h
+    rpc/packet.cpp
+    rpc/packet.h
+    rpc/rpc_server.cpp
+    rpc/rpc_server.h
+    rpc/server.cpp
+    rpc/server.h
+    rpc/udp_server.cpp
+    rpc/udp_server.h
     settings.cpp
     settings.h
     telemetry_session.cpp
@@ -431,18 +439,6 @@ add_library(core STATIC
     tracer/recorder.cpp
     tracer/recorder.h
 )
-if (ENABLE_SCRIPTING)
-    target_sources(core PRIVATE
-        rpc/packet.cpp
-        rpc/packet.h
-        rpc/rpc_server.cpp
-        rpc/rpc_server.h
-        rpc/server.cpp
-        rpc/server.h
-        rpc/zmq_server.cpp
-        rpc/zmq_server.h
-    )
-endif()
 
 create_target_directory_groups(core)
 
@@ -462,7 +458,3 @@ if (ARCHITECTURE_x86_64)
     )
     target_link_libraries(core PRIVATE dynarmic)
 endif()
-
-if (ENABLE_SCRIPTING)
-    target_link_libraries(core PUBLIC libzmq-headers cppzmq-headers libzmq)
-endif()

src/core/core.cpp

@@ -27,9 +27,7 @@
 #include "core/hw/hw.h"
 #include "core/loader/loader.h"
 #include "core/movie.h"
-#ifdef ENABLE_SCRIPTING
 #include "core/rpc/rpc_server.h"
-#endif
 #include "core/settings.h"
 #include "network/network.h"
 #include "video_core/video_core.h"
@@ -201,9 +199,7 @@ System::ResultStatus System::Init(EmuWindow& emu_window, u32 system_mode) {
 
     telemetry_session = std::make_unique<Core::TelemetrySession>();
 
-#ifdef ENABLE_SCRIPTING
     rpc_server = std::make_unique<RPC::RPCServer>();
-#endif
 
     service_manager = std::make_shared<Service::SM::ServiceManager>(*this);
     archive_manager = std::make_unique<Service::FS::ArchiveManager>(*this);
@@ -294,9 +290,7 @@ void System::Shutdown() {
     kernel.reset();
     HW::Shutdown();
     telemetry_session.reset();
-#ifdef ENABLE_SCRIPTING
     rpc_server.reset();
-#endif
     cheat_engine.reset();
     service_manager.reset();
     dsp_core.reset();

src/core/core.h

@@ -24,11 +24,9 @@ namespace AudioCore {
 class DspInterface;
 }
 
-#ifdef ENABLE_SCRIPTING
 namespace RPC {
 class RPCServer;
 }
-#endif
 
 namespace Service {
 namespace SM {
@@ -267,10 +265,8 @@ private:
     /// Cheats manager
     std::unique_ptr<Cheats::CheatEngine> cheat_engine;
 
-#ifdef ENABLE_SCRIPTING
     /// RPC Server for scripting support
     std::unique_ptr<RPC::RPCServer> rpc_server;
-#endif
 
     std::unique_ptr<Service::FS::ArchiveManager> archive_manager;
 

src/core/rpc/rpc_server.h

@@ -13,6 +13,9 @@
 
 namespace RPC {
 
+class Packet;
+struct PacketHeader;
+
 class RPCServer {
 public:
     RPCServer();

src/core/rpc/server.cpp

@@ -1,27 +1,30 @@
 #include <functional>
-
 #include "core/core.h"
+#include "core/rpc/packet.h"
 #include "core/rpc/rpc_server.h"
 #include "core/rpc/server.h"
+#include "core/rpc/udp_server.h"
 
 namespace RPC {
 
 Server::Server(RPCServer& rpc_server) : rpc_server(rpc_server) {}
 
+Server::~Server() = default;
+
 void Server::Start() {
-    const auto callback = [this](std::unique_ptr<RPC::Packet> new_request) {
+    const auto callback = [this](std::unique_ptr<Packet> new_request) {
         NewRequestCallback(std::move(new_request));
     };
 
     try {
-        zmq_server = std::make_unique<ZMQServer>(callback);
+        udp_server = std::make_unique<UDPServer>(callback);
     } catch (...) {
-        LOG_ERROR(RPC_Server, "Error starting ZeroMQ server");
+        LOG_ERROR(RPC_Server, "Error starting UDP server");
     }
 }
 
 void Server::Stop() {
-    zmq_server.reset();
+    udp_server.reset();
 }
 
 void Server::NewRequestCallback(std::unique_ptr<RPC::Packet> new_request) {

src/core/rpc/server.h

@@ -4,24 +4,25 @@
 
 #pragma once
 
-#include "core/rpc/packet.h"
+#include <memory>
-#include "core/rpc/zmq_server.h"
 
 namespace RPC {
 
 class RPCServer;
-class ZMQServer;
+class UDPServer;
+class Packet;
 
 class Server {
 public:
     Server(RPCServer& rpc_server);
+    ~Server();
     void Start();
     void Stop();
-    void NewRequestCallback(std::unique_ptr<RPC::Packet> new_request);
+    void NewRequestCallback(std::unique_ptr<Packet> new_request);
 
 private:
     RPCServer& rpc_server;
-    std::unique_ptr<ZMQServer> zmq_server;
+    std::unique_ptr<UDPServer> udp_server;
 };
 
 } // namespace RPC

src/core/rpc/udp_server.cpp

@@ -0,0 +1,100 @@
+// Copyright 2019 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <thread>
+#include <boost/asio.hpp>
+#include "common/common_types.h"
+#include "common/logging/log.h"
+#include "core/rpc/packet.h"
+#include "core/rpc/udp_server.h"
+
+namespace RPC {
+
+class UDPServer::Impl {
+public:
+    explicit Impl(std::function<void(std::unique_ptr<Packet>)> new_request_callback)
+        // Use a random high port
+        // TODO: Make configurable or increment port number on failure
+        : socket(io_context, boost::asio::ip::udp::endpoint(boost::asio::ip::udp::v4(), 45987)),
+          new_request_callback(std::move(new_request_callback)) {
+
+        StartReceive();
+        worker_thread = std::thread([this] {
+            io_context.run();
+            this->new_request_callback(nullptr);
+        });
+    }
+
+    ~Impl() {
+        io_context.stop();
+        worker_thread.join();
+    }
+
+private:
+    void StartReceive() {
+        socket.async_receive_from(boost::asio::buffer(request_buffer), remote_endpoint,
+                                  [this](const boost::system::error_code& error, std::size_t size) {
+                                      HandleReceive(error, size);
+                                  });
+    }
+
+    void HandleReceive(const boost::system::error_code& error, std::size_t size) {
+        if (error) {
+            LOG_WARNING(RPC_Server, "Failed to receive data on UDP socket: {}", error.message());
+        } else if (size >= MIN_PACKET_SIZE && size <= MAX_PACKET_SIZE) {
+            PacketHeader header;
+            std::memcpy(&header, request_buffer.data(), sizeof(header));
+            if ((size - MIN_PACKET_SIZE) == header.packet_size) {
+                u8* data = request_buffer.data() + MIN_PACKET_SIZE;
+                std::function<void(Packet&)> send_reply_callback =
+                    std::bind(&Impl::SendReply, this, remote_endpoint, std::placeholders::_1);
+                std::unique_ptr<Packet> new_packet =
+                    std::make_unique<Packet>(header, data, send_reply_callback);
+
+                // Send the request to the upper layer for handling
+                new_request_callback(std::move(new_packet));
+            }
+        } else {
+            LOG_WARNING(RPC_Server, "Received message with wrong size: {}", size);
+        }
+        StartReceive();
+    }
+
+    void SendReply(boost::asio::ip::udp::endpoint endpoint, Packet& reply_packet) {
+        std::vector<u8> reply_buffer(MIN_PACKET_SIZE + reply_packet.GetPacketDataSize());
+        auto reply_header = reply_packet.GetHeader();
+
+        std::memcpy(reply_buffer.data(), &reply_header, sizeof(reply_header));
+        std::memcpy(reply_buffer.data() + (4 * sizeof(u32)), reply_packet.GetPacketData().data(),
+                    reply_packet.GetPacketDataSize());
+
+        boost::system::error_code error;
+        socket.send_to(boost::asio::buffer(reply_buffer), endpoint, 0, error);
+
+        if (error) {
+            LOG_WARNING(RPC_Server, "Failed to send reply: {}", error.message());
+        } else {
+            LOG_INFO(RPC_Server, "Sent reply version({}) id=({}) type=({}) size=({})",
+                     reply_packet.GetVersion(), reply_packet.GetId(),
+                     static_cast<u32>(reply_packet.GetPacketType()),
+                     reply_packet.GetPacketDataSize());
+        }
+    }
+
+    std::thread worker_thread;
+
+    boost::asio::io_context io_context;
+    boost::asio::ip::udp::socket socket;
+    std::array<u8, MAX_PACKET_SIZE> request_buffer;
+    boost::asio::ip::udp::endpoint remote_endpoint;
+
+    std::function<void(std::unique_ptr<Packet>)> new_request_callback;
+};
+
+UDPServer::UDPServer(std::function<void(std::unique_ptr<Packet>)> new_request_callback)
+    : impl(std::make_unique<Impl>(new_request_callback)) {}
+
+UDPServer::~UDPServer() = default;
+
+} // namespace RPC

src/core/rpc/udp_server.h

@@ -0,0 +1,24 @@
+// Copyright 2019 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+
+namespace RPC {
+
+class Packet;
+
+class UDPServer {
+public:
+    explicit UDPServer(std::function<void(std::unique_ptr<Packet>)> new_request_callback);
+    ~UDPServer();
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> impl;
+};
+
+} // namespace RPC

src/core/rpc/zmq_server.cpp

@@ -1,79 +0,0 @@
-#include "common/common_types.h"
-#include "core/core.h"
-#include "core/rpc/packet.h"
-#include "core/rpc/zmq_server.h"
-
-namespace RPC {
-
-ZMQServer::ZMQServer(std::function<void(std::unique_ptr<Packet>)> new_request_callback)
-    : zmq_context(std::move(std::make_unique<zmq::context_t>(1))),
-      zmq_socket(std::move(std::make_unique<zmq::socket_t>(*zmq_context, ZMQ_REP))),
-      new_request_callback(std::move(new_request_callback)) {
-    // Use a random high port
-    // TODO: Make configurable or increment port number on failure
-    zmq_socket->bind("tcp://127.0.0.1:45987");
-    LOG_INFO(RPC_Server, "ZeroMQ listening on port 45987");
-
-    worker_thread = std::thread(&ZMQServer::WorkerLoop, this);
-}
-
-ZMQServer::~ZMQServer() {
-    // Triggering the zmq_context destructor will cancel
-    // any blocking calls to zmq_socket->recv()
-    running = false;
-    zmq_context.reset();
-    worker_thread.join();
-
-    LOG_INFO(RPC_Server, "ZeroMQ stopped");
-}
-
-void ZMQServer::WorkerLoop() {
-    zmq::message_t request;
-    while (running) {
-        try {
-            if (zmq_socket->recv(&request, 0)) {
-                if (request.size() >= MIN_PACKET_SIZE && request.size() <= MAX_PACKET_SIZE) {
-                    u8* request_buffer = static_cast<u8*>(request.data());
-                    PacketHeader header;
-                    std::memcpy(&header, request_buffer, sizeof(header));
-                    if ((request.size() - MIN_PACKET_SIZE) == header.packet_size) {
-                        u8* data = request_buffer + MIN_PACKET_SIZE;
-                        std::function<void(Packet&)> send_reply_callback =
-                            std::bind(&ZMQServer::SendReply, this, std::placeholders::_1);
-                        std::unique_ptr<Packet> new_packet =
-                            std::make_unique<Packet>(header, data, send_reply_callback);
-
-                        // Send the request to the upper layer for handling
-                        new_request_callback(std::move(new_packet));
-                    }
-                }
-            }
-        } catch (...) {
-            LOG_WARNING(RPC_Server, "Failed to receive data on ZeroMQ socket");
-        }
-    }
-    std::unique_ptr<Packet> end_packet = nullptr;
-    new_request_callback(std::move(end_packet));
-    // Destroying the socket must be done by this thread.
-    zmq_socket.reset();
-}
-
-void ZMQServer::SendReply(Packet& reply_packet) {
-    if (running) {
-        auto reply_buffer =
-            std::make_unique<u8[]>(MIN_PACKET_SIZE + reply_packet.GetPacketDataSize());
-        auto reply_header = reply_packet.GetHeader();
-
-        std::memcpy(reply_buffer.get(), &reply_header, sizeof(reply_header));
-        std::memcpy(reply_buffer.get() + (4 * sizeof(u32)), reply_packet.GetPacketData().data(),
-                    reply_packet.GetPacketDataSize());
-
-        zmq_socket->send(reply_buffer.get(), MIN_PACKET_SIZE + reply_packet.GetPacketDataSize());
-
-        LOG_INFO(RPC_Server, "Sent reply version({}) id=({}) type=({}) size=({})",
-                 reply_packet.GetVersion(), reply_packet.GetId(),
-                 static_cast<u32>(reply_packet.GetPacketType()), reply_packet.GetPacketDataSize());
-    }
-}
-
-}; // namespace RPC

src/core/rpc/zmq_server.h

@@ -1,34 +0,0 @@
-// Copyright 2018 Citra Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#pragma once
-
-#include <functional>
-#include <thread>
-#define ZMQ_STATIC
-#include <zmq.hpp>
-
-namespace RPC {
-
-class Packet;
-
-class ZMQServer {
-public:
-    explicit ZMQServer(std::function<void(std::unique_ptr<Packet>)> new_request_callback);
-    ~ZMQServer();
-
-private:
-    void WorkerLoop();
-    void SendReply(Packet& request);
-
-    std::thread worker_thread;
-    std::atomic_bool running = true;
-
-    std::unique_ptr<zmq::context_t> zmq_context;
-    std::unique_ptr<zmq::socket_t> zmq_socket;
-
-    std::function<void(std::unique_ptr<Packet>)> new_request_callback;
-};
-
-} // namespace RPC