Choose pipe number on initialize (#250)

* Choose pipe number on initialize

* Get pipe from base connection instance

* UE4 support

* Warnings as errors yelling

* Fix windows connection

* Oops all variables

* maybe this fixes it

* This one actually works!!!!

* Fix double function declaration

src/connection.h

@@ -12,7 +12,7 @@ struct BaseConnection {
     static BaseConnection* Create();
     static void Destroy(BaseConnection*&);
     bool isOpen{false};
-    bool Open();
+    bool Open(int pipe);
     bool Close();
     bool Write(const void* data, size_t length);
     bool Read(void* data, size_t length);

src/connection_unix.cpp

@@ -49,7 +49,7 @@ static const char* GetTempPath()
     c = nullptr;
 }
 
-bool BaseConnection::Open()
+bool BaseConnection::Open(int pipe)
 {
     const char* tempPath = GetTempPath();
     auto self = reinterpret_cast<BaseConnectionUnix*>(this);
@@ -62,8 +62,7 @@ bool BaseConnection::Open()
     int optval = 1;
     setsockopt(self->sock, SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval));
 #endif
-
-    for (int pipeNum = 0; pipeNum < 10; ++pipeNum) {
+    for (int pipeNum = pipe; pipeNum < 10; ++pipeNum) {
         snprintf(
           PipeAddr.sun_path, sizeof(PipeAddr.sun_path), "%s/discord-ipc-%d", tempPath, pipeNum);
         int err = connect(self->sock, (const sockaddr*)&PipeAddr, sizeof(PipeAddr));

src/connection_win.cpp

@@ -6,6 +6,7 @@
 #define NOIME
 #include <assert.h>
 #include <windows.h>
+#include <sstream>
 
 int GetProcessId()
 {
@@ -30,11 +31,11 @@ static BaseConnectionWin Connection;
     c = nullptr;
 }
 
-bool BaseConnection::Open()
+bool BaseConnection::Open(int pipe)
 {
     wchar_t pipeName[]{L"\\\\?\\pipe\\discord-ipc-0"};
     const size_t pipeDigit = sizeof(pipeName) / sizeof(wchar_t) - 2;
-    pipeName[pipeDigit] = L'0';
+    pipeName[pipeDigit] += pipe;
     auto self = reinterpret_cast<BaseConnectionWin*>(this);
     for (;;) {
         self->pipe = ::CreateFileW(

src/discord_rpc.cpp

@@ -273,7 +273,8 @@ static bool DeregisterForEvent(const char* evtName)
 extern "C" DISCORD_EXPORT void Discord_Initialize(const char* applicationId,
                                                   DiscordEventHandlers* handlers,
                                                   int autoRegister,
-                                                  const char* optionalSteamId)
+                                                  const char* optionalSteamId,
+                                                  int pipe)
 {
     IoThread = new (std::nothrow) IoThreadHolder();
     if (IoThread == nullptr) {
@@ -308,7 +309,7 @@ extern "C" DISCORD_EXPORT void Discord_Initialize(const char* applicationId,
         return;
     }
 
-    Connection = RpcConnection::Create(applicationId);
+    Connection = RpcConnection::Create(applicationId, pipe);
     Connection->onConnect = [](JsonDocument& readyMessage) {
         Discord_UpdateHandlers(&QueuedHandlers);
         if (QueuedPresence.length > 0) {

src/rpc_connection.cpp

@@ -6,10 +6,11 @@
 static const int RpcVersion = 1;
 static RpcConnection Instance;
 
-/*static*/ RpcConnection* RpcConnection::Create(const char* applicationId)
+/*static*/ RpcConnection* RpcConnection::Create(const char* applicationId, int pipe)
 {
     Instance.connection = BaseConnection::Create();
     StringCopy(Instance.appId, applicationId);
+    Instance.pipe = pipe;
     return &Instance;
 }
 
@@ -26,7 +27,7 @@ void RpcConnection::Open()
         return;
     }
 
-    if (state == State::Disconnected && !connection->Open()) {
+    if (state == State::Disconnected && !connection->Open(Instance.pipe)) {
         return;
     }
 

src/rpc_connection.h

@@ -43,11 +43,12 @@ struct RpcConnection {
     void (*onConnect)(JsonDocument& message){nullptr};
     void (*onDisconnect)(int errorCode, const char* message){nullptr};
     char appId[64]{};
+    int pipe;
     int lastErrorCode{0};
     char lastErrorMessage[256]{};
     RpcConnection::MessageFrame sendFrame;
 
-    static RpcConnection* Create(const char* applicationId);
+    static RpcConnection* Create(const char* applicationId, int pipe);
     static void Destroy(RpcConnection*&);
 
     inline bool IsOpen() const { return state == State::Connected; }