helpers: Add an async dialog box impl (#9919)

Adds an async dialog box, way safer than our previous local solution for ANR

src/helpers/AsyncDialogBox.cpp

@@ -0,0 +1,122 @@
+#include "AsyncDialogBox.hpp"
+#include "./fs/FsUtils.hpp"
+#include <csignal>
+#include "../managers/eventLoop/EventLoopManager.hpp"
+
+using namespace Hyprutils::OS;
+
+SP<CAsyncDialogBox> CAsyncDialogBox::create(const std::string& title, const std::string& description, std::vector<std::string> buttons) {
+    if (!NFsUtils::executableExistsInPath("hyprland-dialog")) {
+        Debug::log(ERR, "CAsyncDialogBox: cannot create, no hyprland-dialog");
+        return nullptr;
+    }
+
+    auto dialog = SP<CAsyncDialogBox>(new CAsyncDialogBox(title, description, buttons));
+
+    dialog->m_selfWeakReference = dialog;
+
+    return dialog;
+}
+
+CAsyncDialogBox::CAsyncDialogBox(const std::string& title, const std::string& description, std::vector<std::string> buttons) :
+    m_title(title), m_description(description), m_buttons(buttons) {
+    ;
+}
+
+static int onFdWrite(int fd, uint32_t mask, void* data) {
+    auto box = (CAsyncDialogBox*)data;
+
+    box->onWrite(fd, mask);
+
+    return 0;
+}
+
+void CAsyncDialogBox::onWrite(int fd, uint32_t mask) {
+    if (mask & WL_EVENT_READABLE) {
+        std::array<char, 1024> buf;
+        int                    ret = 0;
+
+        // make the FD nonblock for a moment
+        // TODO: can we avoid this without risking a blocking read()?
+        int fdFlags = fcntl(fd, F_GETFL, 0);
+        if (fcntl(fd, F_SETFL, fdFlags | O_NONBLOCK) < 0) {
+            Debug::log(ERR, "CAsyncDialogBox::onWrite: fcntl 1 failed!");
+            return;
+        }
+
+        while ((ret = read(m_pipeReadFd.get(), buf.data(), 1023)) > 0) {
+            m_stdout += std::string_view{(char*)buf.data(), (size_t)ret};
+        }
+
+        // restore the flags (otherwise libwayland wont give us a hangup)
+        if (fcntl(fd, F_SETFL, fdFlags) < 0) {
+            Debug::log(ERR, "CAsyncDialogBox::onWrite: fcntl 2 failed!");
+            return;
+        }
+    }
+
+    if (mask & (WL_EVENT_HANGUP | WL_EVENT_ERROR)) {
+        Debug::log(LOG, "CAsyncDialogBox: dialog {:x} hung up, closed.");
+
+        if (m_onResolution)
+            m_onResolution(m_stdout);
+
+        wl_event_source_remove(m_readEventSource);
+        m_selfReference.reset();
+        return;
+    }
+}
+
+void CAsyncDialogBox::open(std::function<void(std::string)> onResolution) {
+    m_onResolution = onResolution;
+
+    std::string buttonsString = "";
+    for (auto& b : m_buttons) {
+        buttonsString += b + ";";
+    }
+    if (!buttonsString.empty())
+        buttonsString.pop_back();
+
+    CProcess proc("hyprland-dialog", std::vector<std::string>{"--title", m_title, "--text", m_description, "--buttons", buttonsString});
+
+    int      outPipe[2];
+    if (pipe(outPipe)) {
+        Debug::log(ERR, "CAsyncDialogBox::open: failed to pipe()");
+        return;
+    }
+
+    m_pipeReadFd = CFileDescriptor(outPipe[0]);
+
+    proc.setStdoutFD(outPipe[1]);
+
+    m_readEventSource = wl_event_loop_add_fd(g_pEventLoopManager->m_sWayland.loop, m_pipeReadFd.get(), WL_EVENT_READABLE, ::onFdWrite, this);
+
+    if (!m_readEventSource) {
+        Debug::log(ERR, "CAsyncDialogBox::open: failed to add read fd to loop");
+        return;
+    }
+
+    m_selfReference = m_selfWeakReference.lock();
+
+    m_dialogPid = proc.pid();
+
+    if (!proc.runAsync()) {
+        Debug::log(ERR, "CAsyncDialogBox::open: failed to run async");
+        wl_event_source_remove(m_readEventSource);
+        return;
+    }
+
+    // close the write fd, only the dialog owns it now
+    close(outPipe[1]);
+}
+
+void CAsyncDialogBox::kill() {
+    if (m_dialogPid <= 0)
+        return;
+
+    ::kill(m_dialogPid, SIGKILL);
+}
+
+bool CAsyncDialogBox::isRunning() const {
+    return m_readEventSource;
+}