ClickHouse/src/Storages/FileLog/DirectoryWatcherBase.cpp

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#include <Interpreters/Context.h>
#include <Storages/FileLog/DirectoryWatcherBase.h>
#include <Storages/FileLog/FileLogDirectoryWatcher.h>
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#include <Storages/FileLog/StorageFileLog.h>
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#include <filesystem>
#include <unistd.h>
#include <sys/inotify.h>
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#include <poll.h>
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namespace DB
{
namespace ErrorCodes
{
extern const int FILE_DOESNT_EXIST;
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extern const int BAD_FILE_TYPE;
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extern const int IO_SETUP_ERROR;
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}
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static constexpr int buffer_size = 4096;
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DirectoryWatcherBase::DirectoryWatcherBase(
FileLogDirectoryWatcher & owner_, const std::string & path_, ContextPtr context_, int event_mask_)
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: WithContext(context_)
, owner(owner_)
, path(path_)
, event_mask(event_mask_)
, milliseconds_to_wait(owner.storage.getFileLogSettings()->poll_directory_watch_events_backoff_init.totalMilliseconds())
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{
if (!std::filesystem::exists(path))
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throw Exception(ErrorCodes::FILE_DOESNT_EXIST, "Path {} does not exist", path);
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if (!std::filesystem::is_directory(path))
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throw Exception(ErrorCodes::BAD_FILE_TYPE, "Path {} is not a directory", path);
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fd = inotify_init();
if (fd == -1)
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throwFromErrno("Cannot initialize inotify", ErrorCodes::IO_SETUP_ERROR);
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watch_task = getContext()->getSchedulePool().createTask("directory_watch", [this] { watchFunc(); });
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start();
}
void DirectoryWatcherBase::watchFunc()
{
int mask = 0;
if (eventMask() & DirectoryWatcherBase::DW_ITEM_ADDED)
mask |= IN_CREATE;
if (eventMask() & DirectoryWatcherBase::DW_ITEM_REMOVED)
mask |= IN_DELETE;
if (eventMask() & DirectoryWatcherBase::DW_ITEM_MODIFIED)
mask |= IN_MODIFY;
if (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_FROM)
mask |= IN_MOVED_FROM;
if (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_TO)
mask |= IN_MOVED_TO;
int wd = inotify_add_watch(fd, path.c_str(), mask);
if (wd == -1)
{
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owner.onError(Exception(ErrorCodes::IO_SETUP_ERROR, "Watch directory {} failed", path));
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throwFromErrnoWithPath("Watch directory {} failed", path, ErrorCodes::IO_SETUP_ERROR);
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}
std::string buffer;
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buffer.resize(buffer_size);
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pollfd pfd;
pfd.fd = fd;
pfd.events = POLLIN;
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while (!stopped)
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{
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const auto & settings = owner.storage.getFileLogSettings();
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if (poll(&pfd, 1, milliseconds_to_wait) > 0 && pfd.revents & POLLIN)
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{
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milliseconds_to_wait = settings->poll_directory_watch_events_backoff_init.totalMilliseconds();
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int n = read(fd, buffer.data(), buffer.size());
int i = 0;
if (n > 0)
{
while (n > 0)
{
struct inotify_event * p_event = reinterpret_cast<struct inotify_event *>(buffer.data() + i);
if (p_event->len > 0)
{
if ((p_event->mask & IN_CREATE) && (eventMask() & DirectoryWatcherBase::DW_ITEM_ADDED))
{
DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_ADDED);
owner.onItemAdded(ev);
}
if ((p_event->mask & IN_DELETE) && (eventMask() & DirectoryWatcherBase::DW_ITEM_REMOVED))
{
DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_REMOVED);
owner.onItemRemoved(ev);
}
if ((p_event->mask & IN_MODIFY) && (eventMask() & DirectoryWatcherBase::DW_ITEM_MODIFIED))
{
DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_MODIFIED);
owner.onItemModified(ev);
}
if ((p_event->mask & IN_MOVED_FROM) && (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_FROM))
{
DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_MOVED_FROM);
owner.onItemMovedFrom(ev);
}
if ((p_event->mask & IN_MOVED_TO) && (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_TO))
{
DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_MOVED_TO);
owner.onItemMovedTo(ev);
}
}
i += sizeof(inotify_event) + p_event->len;
n -= sizeof(inotify_event) + p_event->len;
}
}
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/// Wake up reader thread
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owner.storage.wakeUp();
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}
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else
{
if (milliseconds_to_wait < static_cast<uint64_t>(settings->poll_directory_watch_events_backoff_max.totalMilliseconds()))
milliseconds_to_wait *= settings->poll_directory_watch_events_backoff_factor.value;
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}
}
}
DirectoryWatcherBase::~DirectoryWatcherBase()
{
stop();
close(fd);
}
void DirectoryWatcherBase::start()
{
if (watch_task)
watch_task->activateAndSchedule();
}
void DirectoryWatcherBase::stop()
{
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stopped = true;
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if (watch_task)
watch_task->deactivate();
}
}