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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/ozone/platform/wayland/host/xdg_session_manager.h"
#include <xx-session-management-v1-client-protocol.h>
#include <algorithm>
#include <cstdint>
#include <memory>
#include <optional>
#include <ranges>
#include <string>
#include "base/check_op.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "ui/ozone/platform/wayland/common/wayland_object.h"
#include "ui/ozone/platform/wayland/host/wayland_connection.h"
#include "ui/ozone/platform/wayland/host/wayland_toplevel_window.h"
#include "ui/ozone/platform/wayland/host/xdg_session.h"
#include "ui/ozone/platform/wayland/host/xdg_toplevel.h"
#include "ui/ozone/public/platform_session_manager.h"
namespace ui {
namespace {
constexpr uint32_t kMaxVersion = 1;
} // namespace
// static
void XdgSessionManager::Instantiate(WaylandConnection* connection,
wl_registry* registry,
uint32_t name,
const std::string& interface,
uint32_t version) {
CHECK_EQ(interface, kInterfaceName) << "Expected \"" << kInterfaceName
<< "\" but got \"" << interface << "\"";
if (connection->session_manager_) {
return;
}
auto instance = wl::Bind<::xx_session_manager_v1>(
registry, name, std::min(version, kMaxVersion));
if (!instance) {
LOG(ERROR) << "Failed to bind " << kInterfaceName;
return;
}
connection->session_manager_ =
std::make_unique<XdgSessionManager>(std::move(instance), connection);
}
// XdgSessionManager:
XdgSessionManager::XdgSessionManager(wl::Object<xx_session_manager_v1> manager,
WaylandConnection* connection)
: connection_(connection), manager_(std::move(manager)) {}
XdgSessionManager::~XdgSessionManager() = default;
std::optional<std::string> XdgSessionManager::CreateSession() {
auto session = std::make_unique<XdgSession>(
xx_session_manager_v1_get_session(
manager_.get(), XX_SESSION_MANAGER_V1_REASON_LAUNCH, nullptr),
this);
EnsureReady(*session);
if (!session) {
PLOG(ERROR) << "Failed to create a XDG Session";
return std::nullopt;
}
EnsureReady(*session);
auto result = session->state() == XdgSession::State::kCreated
? std::optional<std::string>(session->id())
: std::nullopt;
sessions_.push_back(std::move(session));
return result;
}
std::optional<std::string> XdgSessionManager::RestoreSession(
const std::string& session_id,
RestoreReason reason) {
CHECK(!session_id.empty());
if (auto* existing_session = GetSession(session_id)) {
return existing_session->id();
}
const uint32_t wl_reason =
reason == PlatformSessionManager::RestoreReason::kPostCrash
? XX_SESSION_MANAGER_V1_REASON_RECOVER
: XX_SESSION_MANAGER_V1_REASON_LAUNCH;
auto session = std::make_unique<XdgSession>(
xx_session_manager_v1_get_session(manager_.get(), wl_reason,
session_id.c_str()),
this, session_id);
EnsureReady(*session);
// If, for some reason, the provided compositor fails to retrieve the session
// data corresponding to `session_id`, it will treat `session_id` as null
// and will tentatively create a new session, thus the condition below.
auto result = (session->state() == XdgSession::State::kRestored ||
session->state() == XdgSession::State::kCreated)
? std::optional<std::string>(session->id())
: std::nullopt;
sessions_.push_back(std::move(session));
return result;
}
void XdgSessionManager::RemoveWindow(const std::string& session_id,
const int32_t window_id) {
if (auto* session = GetSession(session_id)) {
session->RemoveToplevel(window_id);
return;
}
DLOG(WARNING) << "No session found for id=" << session_id;
}
XdgSession* XdgSessionManager::GetSession(const std::string& session_id) const {
auto it = std::ranges::find(sessions_, session_id, &XdgSession::id);
return it != sessions_.end() ? it->get() : nullptr;
}
void XdgSessionManager::DestroySession(XdgSession* session) {
auto [begin, end] = std::ranges::remove(sessions_, session,
&std::unique_ptr<XdgSession>::get);
sessions_.erase(begin, end);
}
void XdgSessionManager::EnsureReady(const XdgSession& session) {
CHECK_NE(session.state(), XdgSession::State::kInert);
// TODO(crbug.com/352081012): Consider implementing a timeout mechanism.
while (session.state() == XdgSession::State::kPending) {
connection_->RoundTripQueue();
}
}
} // namespace ui
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