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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef RBD_MIRROR_IMAGE_REPLAYER_EVENT_PREPROCESSOR_H
#define RBD_MIRROR_IMAGE_REPLAYER_EVENT_PREPROCESSOR_H
#include "include/int_types.h"
#include "librbd/journal/Types.h"
#include "librbd/journal/TypeTraits.h"
#include <map>
#include <string>
#include <boost/variant/static_visitor.hpp>
struct Context;
namespace journal { class Journaler; }
namespace librbd {
class ImageCtx;
namespace asio { struct ContextWQ; }
} // namespace librbd
namespace rbd {
namespace mirror {
namespace image_replayer {
namespace journal {
template <typename ImageCtxT = librbd::ImageCtx>
class EventPreprocessor {
public:
using Journaler = typename librbd::journal::TypeTraits<ImageCtxT>::Journaler;
using EventEntry = librbd::journal::EventEntry;
using MirrorPeerClientMeta = librbd::journal::MirrorPeerClientMeta;
static EventPreprocessor *create(ImageCtxT &local_image_ctx,
Journaler &remote_journaler,
const std::string &local_mirror_uuid,
MirrorPeerClientMeta *client_meta,
librbd::asio::ContextWQ *work_queue) {
return new EventPreprocessor(local_image_ctx, remote_journaler,
local_mirror_uuid, client_meta, work_queue);
}
static void destroy(EventPreprocessor* processor) {
delete processor;
}
EventPreprocessor(ImageCtxT &local_image_ctx, Journaler &remote_journaler,
const std::string &local_mirror_uuid,
MirrorPeerClientMeta *client_meta,
librbd::asio::ContextWQ *work_queue);
~EventPreprocessor();
bool is_required(const EventEntry &event_entry);
void preprocess(EventEntry *event_entry, Context *on_finish);
private:
/**
* @verbatim
*
* <start>
* |
* v (skip if not required)
* REFRESH_IMAGE
* |
* v (skip if not required)
* PREPROCESS_EVENT
* |
* v (skip if not required)
* UPDATE_CLIENT
*
* @endverbatim
*/
typedef std::map<uint64_t, uint64_t> SnapSeqs;
class PreprocessEventVisitor : public boost::static_visitor<int> {
public:
EventPreprocessor *event_preprocessor;
PreprocessEventVisitor(EventPreprocessor *event_preprocessor)
: event_preprocessor(event_preprocessor) {
}
template <typename T>
inline int operator()(T&) const {
return 0;
}
inline int operator()(librbd::journal::SnapRenameEvent &event) const {
return event_preprocessor->preprocess_snap_rename(event);
}
};
ImageCtxT &m_local_image_ctx;
Journaler &m_remote_journaler;
std::string m_local_mirror_uuid;
MirrorPeerClientMeta *m_client_meta;
librbd::asio::ContextWQ *m_work_queue;
bool m_in_progress = false;
EventEntry *m_event_entry = nullptr;
Context *m_on_finish = nullptr;
SnapSeqs m_snap_seqs;
bool m_snap_seqs_updated = false;
bool prune_snap_map(SnapSeqs *snap_seqs);
void refresh_image();
void handle_refresh_image(int r);
void preprocess_event();
int preprocess_snap_rename(librbd::journal::SnapRenameEvent &event);
void update_client();
void handle_update_client(int r);
void finish(int r);
};
} // namespace journal
} // namespace image_replayer
} // namespace mirror
} // namespace rbd
extern template class rbd::mirror::image_replayer::journal::EventPreprocessor<librbd::ImageCtx>;
#endif // RBD_MIRROR_IMAGE_REPLAYER_EVENT_PREPROCESSOR_H
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