From 0f0b00dc1f56dbd380c989b3de8a3b5253efbb5f Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sat, 3 Aug 2019 20:56:08 +0200
Subject: [PATCH] Lagom: Add a simple IPC client and server for host-side
 testing

Add LibIPC to the Lagom build, and also implement two little test apps
so we can run IPC tests on other systems.
---
 Lagom/CMakeLists.txt      | 13 +++++++++++--
 Lagom/SimpleIPC.ipc       |  3 +++
 Lagom/SimpleIPCClient.cpp | 39 ++++++++++++++++++++++++++++++++++++++
 Lagom/SimpleIPCServer.cpp | 40 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 93 insertions(+), 2 deletions(-)
 create mode 100644 Lagom/SimpleIPC.ipc
 create mode 100644 Lagom/SimpleIPCClient.cpp
 create mode 100644 Lagom/SimpleIPCServer.cpp

diff --git a/Lagom/CMakeLists.txt b/Lagom/CMakeLists.txt
index ac94f5ac772..33b7b8bb603 100644
--- a/Lagom/CMakeLists.txt
+++ b/Lagom/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.0)
 project (Lagom)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -Wall -Wextra -Werror -std=c++17 -fPIC")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -Wall -Wextra -Werror -std=c++17 -fPIC -g")
 
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wconsumed")
@@ -11,8 +11,9 @@ endif()
 
 file(GLOB AK_SOURCES "../AK/*.cpp")
 file(GLOB LIBCORE_SOURCES "../Libraries/LibCore/*.cpp")
+file(GLOB LIBIPC_SOURCES "../Libraries/LibIPC/*.cpp")
 
-set(SOURCES ${AK_SOURCES} ${LIBCORE_SOURCES})
+set(SOURCES ${AK_SOURCES} ${LIBCORE_SOURCES} ${LIBIPC_SOURCES})
 
 include_directories (../)
 include_directories (../Libraries/)
@@ -21,3 +22,11 @@ add_library(lagom ${SOURCES})
 add_executable(TestApp TestApp.cpp)
 target_link_libraries(TestApp lagom)
 target_link_libraries(TestApp stdc++)
+
+add_executable(SimpleIPCClient SimpleIPCClient.cpp)
+target_link_libraries(SimpleIPCClient lagom)
+target_link_libraries(SimpleIPCClient stdc++)
+
+add_executable(SimpleIPCServer SimpleIPCServer.cpp)
+target_link_libraries(SimpleIPCServer lagom)
+target_link_libraries(SimpleIPCServer stdc++)
diff --git a/Lagom/SimpleIPC.ipc b/Lagom/SimpleIPC.ipc
new file mode 100644
index 00000000000..904314dc6cf
--- /dev/null
+++ b/Lagom/SimpleIPC.ipc
@@ -0,0 +1,3 @@
+endpoint Simple {
+    ComputeSum(i32 a, i32 b, i32 c) => (i32 sum)
+}
diff --git a/Lagom/SimpleIPCClient.cpp b/Lagom/SimpleIPCClient.cpp
new file mode 100644
index 00000000000..031cccf88d3
--- /dev/null
+++ b/Lagom/SimpleIPCClient.cpp
@@ -0,0 +1,39 @@
+#include <LibCore/CEventLoop.h>
+#include <LibCore/CTimer.h>
+#include <LibCore/CoreIPCClient.h>
+#include <stdio.h>
+#include "SimpleEndpoint.h"
+
+class SimpleIPCClient : public IPC::Client::ConnectionNG<SimpleEndpoint> {
+    C_OBJECT(SimpleIPCClient)
+public:
+    SimpleIPCClient()
+        : ConnectionNG("/tmp/simple-ipc")
+    {}
+
+    virtual void handshake() override {}
+
+    i32 compute_sum(i32 a, i32 b, i32 c)
+    {
+        return send_sync<Simple::ComputeSum>(a, b, c)->sum();
+    }
+};
+
+int main(int, char**)
+{
+    CEventLoop event_loop;
+
+    SimpleIPCClient client;
+
+    CTimer timer(100, [&] {
+        i32 sum = client.compute_sum(1, 2, 3);
+        dbg() << "Sum: " << sum;
+    });
+
+    CTimer kill_timer(5000, [&] {
+        dbg() << "Timer fired, good-bye! :^)";
+        event_loop.quit(0);
+    });
+
+    return event_loop.exec();
+}
diff --git a/Lagom/SimpleIPCServer.cpp b/Lagom/SimpleIPCServer.cpp
new file mode 100644
index 00000000000..3d4b5b69f1b
--- /dev/null
+++ b/Lagom/SimpleIPCServer.cpp
@@ -0,0 +1,40 @@
+#include <LibCore/CEventLoop.h>
+#include <LibCore/CTimer.h>
+#include <LibCore/CoreIPCServer.h>
+#include <LibCore/CLocalServer.h>
+#include <stdio.h>
+#include "SimpleEndpoint.h"
+
+class SimpleIPCServer final :
+    public IPC::Server::ConnectionNG<SimpleEndpoint>,
+    public SimpleEndpoint {
+
+    C_OBJECT(SimpleIPCServer)
+public:
+    SimpleIPCServer(CLocalSocket& socket, int client_id)
+        : ConnectionNG(*this, socket, client_id)
+    {
+    }
+
+    virtual OwnPtr<Simple::ComputeSumResponse> handle(const Simple::ComputeSum& message)
+    {
+        return make<Simple::ComputeSumResponse>(message.a() + message.b() + message.c());
+    }
+};
+
+int main(int, char**)
+{
+    CEventLoop event_loop;
+
+    unlink("/tmp/simple-ipc");
+    CLocalServer server_sock;
+    server_sock.listen("/tmp/simple-ipc");
+    server_sock.on_ready_to_accept = [&] {
+        auto* client_socket = server_sock.accept();
+        ASSERT(client_socket);
+        static int next_client_id = 0;
+        IPC::Server::new_connection_ng_for_client<SimpleIPCServer>(*client_socket, ++next_client_id);
+    };
+
+    return event_loop.exec();
+}