Merge pull request #569 from MihailRis/fix-resume-dead-coroutine

fix "cannot resume dead coroutine"

res/scripts/classes.lua

@@ -46,22 +46,66 @@ local Socket = {__index={
     get_address=function(self) return network.__get_address(self.id) end,
 }}
 
-network.tcp_connect = function(address, port, callback)
-    local socket = setmetatable({id=0}, Socket)
-    socket.id = network.__connect(address, port, function(id)
-        callback(socket)
-    end)
-    return socket
-end
-
 local ServerSocket = {__index={
     close=function(self) return network.__closeserver(self.id) end,
     is_open=function(self) return network.__is_serveropen(self.id) end,
     get_port=function(self) return network.__get_serverport(self.id) end,
 }}
 
-network.tcp_open = function(port, handler)
-    return setmetatable({id=network.__open(port, function(id)
+
+local _tcp_server_callbacks = {}
+local _tcp_client_callbacks = {}
+
+network.tcp_open = function (port, handler)
+    local socket = setmetatable({id=network.__open(port)}, ServerSocket)
+
+    _tcp_server_callbacks[socket.id] = function(id)
         handler(setmetatable({id=id}, Socket))
-    end)}, ServerSocket)
+    end
+    return socket
+end
+
+network.tcp_connect = function(address, port, callback)
+    local socket = setmetatable({id=0}, Socket)
+    socket.id = network.__connect(address, port)
+    _tcp_client_callbacks[socket.id] = function() callback(socket) end
+    return socket
+end
+
+network.__process_events = function()
+    local CLIENT_CONNECTED = 1
+    local CONNECTED_TO_SERVER = 2
+
+    local cleaned = false
+    local events = network.__pull_events()
+    for i, event in ipairs(events) do
+        local etype, sid, cid = unpack(event)
+
+        if etype == CLIENT_CONNECTED then
+            local callback = _tcp_server_callbacks[sid]
+            if callback then
+                callback(cid)
+            end
+        elseif etype == CONNECTED_TO_SERVER then
+            local callback = _tcp_client_callbacks[cid]
+            if callback then
+                callback()
+            end
+        end
+
+        -- remove dead servers
+        if not cleaned then
+            for sid, _ in pairs(_tcp_server_callbacks) do
+                if not network.__is_serveropen(sid) then
+                    _tcp_server_callbacks[sid] = nil
+                end
+            end
+            for cid, _ in pairs(_tcp_client_callbacks) do
+                if not network.__is_alive(cid) then
+                    _tcp_client_callbacks[cid] = nil
+                end
+            end
+            cleaned = true
+        end
+    end
 end

res/scripts/stdlib.lua

@@ -34,7 +34,10 @@ local function complete_app_lib(app)
     app.reconfig_packs = core.reconfig_packs
     app.get_setting = core.get_setting
     app.set_setting = core.set_setting
-    app.tick = coroutine.yield
+    app.tick = function()
+        coroutine.yield()
+        network.__process_events()
+    end
     app.get_version = core.get_version
     app.get_setting_info = core.get_setting_info
     app.load_content = function()

src/logic/scripting/lua/libs/libnetwork.cpp

@@ -89,20 +89,6 @@ static int l_post(lua::State* L, network::Network& network) {
     return 0;
 }
 
-static int l_connect(lua::State* L, network::Network& network) {
-    std::string address = lua::require_string(L, 1);
-    int port = lua::tointeger(L, 2);
-    lua::pushvalue(L, 3);
-    auto callback = lua::create_lambda_nothrow(L);
-    u64id_t id = network.connect(address, port, [callback](u64id_t id) {
-        engine->postRunnable([=]() {
-            callback({id});
-        });
-    });
-    return lua::pushinteger(L, id);
-}
-
-
 static int l_close(lua::State* L, network::Network& network) {
     u64id_t id = lua::tointeger(L, 1);
     if (auto connection = network.getConnection(id)) {
@@ -182,14 +168,32 @@ static int l_available(lua::State* L, network::Network& network) {
     return 0;
 }
 
+enum NetworkEventType {
+    CLIENT_CONNECTED = 1,
+    CONNECTED_TO_SERVER
+};
+
+struct NetworkEvent {
+    NetworkEventType type;
+    u64id_t server;
+    u64id_t client;
+};
+
+static std::vector<NetworkEvent> events_queue {};
+
+static int l_connect(lua::State* L, network::Network& network) {
+    std::string address = lua::require_string(L, 1);
+    int port = lua::tointeger(L, 2);
+    u64id_t id = network.connect(address, port, [](u64id_t cid) {
+        events_queue.push_back({CONNECTED_TO_SERVER, 0, cid});
+    });
+    return lua::pushinteger(L, id);
+}
+
 static int l_open(lua::State* L, network::Network& network) {
     int port = lua::tointeger(L, 1);
-    lua::pushvalue(L, 2);
-    auto callback = lua::create_lambda_nothrow(L);
-    u64id_t id = network.openServer(port, [callback](u64id_t id) {
-        engine->postRunnable([=]() {
-            callback({id});
-        });
+    u64id_t id = network.openServer(port, [](u64id_t sid, u64id_t id) {
+        events_queue.push_back({CLIENT_CONNECTED, sid, id});
     });
     return lua::pushinteger(L, id);
 }
@@ -250,6 +254,26 @@ static int l_get_total_download(lua::State* L, network::Network& network) {
     return lua::pushinteger(L, network.getTotalDownload());
 }
 
+static int l_pull_events(lua::State* L, network::Network& network) {
+    lua::createtable(L, events_queue.size(), 0);
+    for (size_t i = 0; i < events_queue.size(); i++) {
+        lua::createtable(L, 3, 0);
+
+        lua::pushinteger(L, events_queue[i].type);
+        lua::rawseti(L, 1);
+
+        lua::pushinteger(L, events_queue[i].server);
+        lua::rawseti(L, 2);
+
+        lua::pushinteger(L, events_queue[i].client);
+        lua::rawseti(L, 3);
+        
+        lua::rawseti(L, i + 1);
+    }
+    events_queue.clear();
+    return 1;
+}
+
 template <int(*func)(lua::State*, network::Network&)>
 int wrap(lua_State* L) {
     int result = 0;
@@ -267,13 +291,13 @@ int wrap(lua_State* L) {
     return result;
 }
 
-
 const luaL_Reg networklib[] = {
     {"get", wrap<l_get>},
     {"get_binary", wrap<l_get_binary>},
     {"post", wrap<l_post>},
     {"get_total_upload", wrap<l_get_total_upload>},
     {"get_total_download", wrap<l_get_total_download>},
+    {"__pull_events", wrap<l_pull_events>},
     {"__open", wrap<l_open>},
     {"__closeserver", wrap<l_closeserver>},
     {"__connect", wrap<l_connect>},

src/logic/scripting/scripting.cpp

@@ -90,7 +90,7 @@ public:
     }
     
     void update() override {
-        if (id == 0) {
+        if (!alive || id == 0) {
             return;
         }
         if (lua::requireglobal(L, "__vc_resume_coroutine")) {

src/network/Network.cpp

@@ -477,6 +477,7 @@ public:
 };
 
 class SocketTcpSServer : public TcpServer {
+    u64id_t id;
     Network* network;
     SOCKET descriptor;
     std::vector<u64id_t> clients;
@@ -485,14 +486,14 @@ class SocketTcpSServer : public TcpServer {
     std::unique_ptr<std::thread> thread = nullptr;
     int port;
 public:
-    SocketTcpSServer(Network* network, SOCKET descriptor, int port)
-    : network(network), descriptor(descriptor), port(port) {}
+    SocketTcpSServer(u64id_t id, Network* network, SOCKET descriptor, int port)
+    : id(id), network(network), descriptor(descriptor), port(port) {}
 
     ~SocketTcpSServer() {
         closeSocket();
     }
 
-    void startListen(consumer<u64id_t> handler) override {
+    void startListen(ConnectCallback handler) override {
         thread = std::make_unique<std::thread>([this, handler]() {
             while (open) {
                 logger.info() << "listening for connections";
@@ -518,7 +519,7 @@ public:
                     std::lock_guard lock(clientsMutex);
                     clients.push_back(id);
                 }
-                handler(id);
+                handler(this->id, id);
             }
         });
     }
@@ -558,7 +559,7 @@ public:
     }
 
     static std::shared_ptr<SocketTcpSServer> openServer(
-        Network* network, int port, consumer<u64id_t> handler
+        u64id_t id, Network* network, int port, ConnectCallback handler
     ) {
         SOCKET descriptor = socket(
             AF_INET, SOCK_STREAM, 0
@@ -585,7 +586,7 @@ public:
         }
         logger.info() << "opened server at port " << port;
         auto server =
-            std::make_shared<SocketTcpSServer>(network, descriptor, port);
+            std::make_shared<SocketTcpSServer>(id, network, descriptor, port);
         server->startListen(std::move(handler));
         return server;
     }
@@ -645,9 +646,9 @@ u64id_t Network::connect(const std::string& address, int port, consumer<u64id_t>
     return id;
 }
 
-u64id_t Network::openServer(int port, consumer<u64id_t> handler) {
+u64id_t Network::openServer(int port, ConnectCallback handler) {
     u64id_t id = nextServer++;
-    auto server = SocketTcpSServer::openServer(this, port, handler);
+    auto server = SocketTcpSServer::openServer(id, this, port, handler);
     servers[id] = std::move(server);
     return id;
 }

src/network/Network.hpp

@@ -12,6 +12,7 @@
 namespace network {
     using OnResponse = std::function<void(std::vector<char>)>;
     using OnReject = std::function<void(int)>;
+    using ConnectCallback = std::function<void(u64id_t, u64id_t)>;
 
     class Requests {
     public:
@@ -64,7 +65,7 @@ namespace network {
     class TcpServer {
     public:
         virtual ~TcpServer() {}
-        virtual void startListen(consumer<u64id_t> handler) = 0;
+        virtual void startListen(ConnectCallback handler) = 0;
         virtual void close() = 0;
         virtual bool isOpen() = 0;
         virtual int getPort() const = 0;
@@ -106,7 +107,7 @@ namespace network {
 
         u64id_t connect(const std::string& address, int port, consumer<u64id_t> callback);
 
-        u64id_t openServer(int port, consumer<u64id_t> handler);
+        u64id_t openServer(int port, ConnectCallback handler);
 
         u64id_t addConnection(const std::shared_ptr<Connection>& connection);