2021-10-10 16:31:32 +00:00
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#include <Interpreters/Context.h>
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#include <Storages/FileLog/DirectoryWatcherBase.h>
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#include <Storages/FileLog/FileLogDirectoryWatcher.h>
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#include <filesystem>
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#include <unistd.h>
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#include <sys/inotify.h>
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#include <sys/select.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int FILE_DOESNT_EXIST;
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extern const int DIRECTORY_DOESNT_EXIST;
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2021-10-11 04:06:31 +00:00
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extern const int IO_SETUP_ERROR;
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2021-10-10 16:31:32 +00:00
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}
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2021-10-11 04:06:31 +00:00
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static constexpr int event_size = sizeof(struct inotify_event);
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static constexpr int buffer_size = 1024 * (NAME_MAX + event_size + 1);
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DirectoryWatcherBase::DirectoryWatcherBase(
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FileLogDirectoryWatcher & owner_, const std::string & path_, ContextPtr context_, int event_mask_)
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: WithContext(context_->getGlobalContext()), owner(owner_), path(path_), event_mask(event_mask_)
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2021-10-10 16:31:32 +00:00
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{
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if (!std::filesystem::exists(path))
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throw Exception(ErrorCodes::FILE_DOESNT_EXIST, "The path {} does not exist.", path);
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if (!std::filesystem::is_directory(path))
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throw Exception(ErrorCodes::DIRECTORY_DOESNT_EXIST, "The path {} does not a directory.", path);
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fd = inotify_init();
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if (fd == -1)
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2021-10-11 04:06:31 +00:00
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throw Exception("cannot initialize inotify", ErrorCodes::IO_SETUP_ERROR);
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2021-10-10 16:31:32 +00:00
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watch_task = getContext()->getMessageBrokerSchedulePool().createTask("directory_watch", [this] { watchFunc(); });
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start();
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}
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void DirectoryWatcherBase::watchFunc()
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{
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int mask = 0;
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if (eventMask() & DirectoryWatcherBase::DW_ITEM_ADDED)
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mask |= IN_CREATE;
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if (eventMask() & DirectoryWatcherBase::DW_ITEM_REMOVED)
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mask |= IN_DELETE;
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if (eventMask() & DirectoryWatcherBase::DW_ITEM_MODIFIED)
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mask |= IN_MODIFY;
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if (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_FROM)
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mask |= IN_MOVED_FROM;
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if (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_TO)
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mask |= IN_MOVED_TO;
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int wd = inotify_add_watch(fd, path.c_str(), mask);
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if (wd == -1)
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{
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2021-10-11 04:06:31 +00:00
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owner.onError(Exception(ErrorCodes::IO_SETUP_ERROR, "Watch directory {} failed.", path));
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}
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std::string buffer;
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buffer.resize(buffer_size);
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fd_set fds;
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while (!stopped)
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2021-10-10 16:31:32 +00:00
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{
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2021-10-12 16:50:50 +00:00
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wreserved-identifier"
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FD_ZERO(&fds);
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2021-10-12 16:50:50 +00:00
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#pragma clang diagnostic pop
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2021-10-10 16:31:32 +00:00
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2021-10-13 02:11:15 +00:00
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FD_SET(fd, &fds);
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2021-10-10 16:31:32 +00:00
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = 200000;
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if (select(fd + 1, &fds, nullptr, nullptr, &tv) == 1)
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{
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int n = read(fd, buffer.data(), buffer.size());
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int i = 0;
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if (n > 0)
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{
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while (n > 0)
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{
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struct inotify_event * p_event = reinterpret_cast<struct inotify_event *>(buffer.data() + i);
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if (p_event->len > 0)
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{
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if ((p_event->mask & IN_CREATE) && (eventMask() & DirectoryWatcherBase::DW_ITEM_ADDED))
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{
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DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_ADDED);
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owner.onItemAdded(ev);
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}
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if ((p_event->mask & IN_DELETE) && (eventMask() & DirectoryWatcherBase::DW_ITEM_REMOVED))
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{
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DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_REMOVED);
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owner.onItemRemoved(ev);
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}
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if ((p_event->mask & IN_MODIFY) && (eventMask() & DirectoryWatcherBase::DW_ITEM_MODIFIED))
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{
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DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_MODIFIED);
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owner.onItemModified(ev);
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}
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if ((p_event->mask & IN_MOVED_FROM) && (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_FROM))
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{
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DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_MOVED_FROM);
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owner.onItemMovedFrom(ev);
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}
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if ((p_event->mask & IN_MOVED_TO) && (eventMask() & DirectoryWatcherBase::DW_ITEM_MOVED_TO))
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{
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DirectoryWatcherBase::DirectoryEvent ev(p_event->name, DirectoryWatcherBase::DW_ITEM_MOVED_TO);
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owner.onItemMovedTo(ev);
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}
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}
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i += sizeof(inotify_event) + p_event->len;
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n -= sizeof(inotify_event) + p_event->len;
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}
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}
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}
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}
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}
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DirectoryWatcherBase::~DirectoryWatcherBase()
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{
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stop();
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close(fd);
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}
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void DirectoryWatcherBase::start()
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{
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if (watch_task)
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watch_task->activateAndSchedule();
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}
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void DirectoryWatcherBase::stop()
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{
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stopped = true;
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2021-10-10 16:31:32 +00:00
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if (watch_task)
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watch_task->deactivate();
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}
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}
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