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/*
* Copyright (C) 2017 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FileMonitor.h"
#include <wtf/FileSystem.h>
#include <wtf/glib/GUniquePtr.h>
namespace WebCore {
FileMonitor::FileMonitor(const String& path, Ref<WorkQueue>&& handlerQueue, Function<void(FileChangeType)>&& modificationHandler)
: m_handlerQueue(WTFMove(handlerQueue))
, m_modificationHandler(WTFMove(modificationHandler))
{
if (path.isEmpty() || !m_modificationHandler)
return;
Function<void ()> createPlatformMonitor = [&] {
auto file = adoptGRef(g_file_new_for_path(FileSystem::fileSystemRepresentation(path).data()));
GUniqueOutPtr<GError> error;
m_platformMonitor = adoptGRef(g_file_monitor(file.get(), G_FILE_MONITOR_NONE, nullptr, &error.outPtr()));
if (m_platformMonitor)
g_signal_connect(m_platformMonitor.get(), "changed", G_CALLBACK(fileChangedCallback), this);
else
WTFLogAlways("Failed to create a monitor for path %s: %s", path.utf8().data(), error->message);
};
// The monitor can be created in the work queue thread.
if (m_handlerQueue->isCurrent()) {
createPlatformMonitor();
return;
}
m_handlerQueue->dispatchSync([createPlatformMonitor = WTFMove(createPlatformMonitor)] {
createPlatformMonitor();
});
}
FileMonitor::~FileMonitor()
{
// The monitor can be destroyed in the work queue thread.
if (m_handlerQueue->isCurrent()) {
cancel();
return;
}
m_handlerQueue->dispatchSync([this] {
cancel();
});
}
void FileMonitor::fileChangedCallback(GFileMonitor*, GFile*, GFile*, GFileMonitorEvent event, FileMonitor* monitor)
{
switch (event) {
case G_FILE_MONITOR_EVENT_DELETED:
monitor->didChange(FileChangeType::Removal);
break;
case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
case G_FILE_MONITOR_EVENT_CREATED:
monitor->didChange(FileChangeType::Modification);
break;
default:
break;
}
}
void FileMonitor::didChange(FileChangeType type)
{
ASSERT(!isMainThread());
if (type == FileChangeType::Removal)
cancel();
m_modificationHandler(type);
}
void FileMonitor::cancel()
{
if (!m_platformMonitor)
return;
g_file_monitor_cancel(m_platformMonitor.get());
m_platformMonitor = nullptr;
}
} // namespace WebCore
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