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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_RBD_MIRROR_INSTANCE_WATCHER_H
#define CEPH_RBD_MIRROR_INSTANCE_WATCHER_H
#include <map>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include "common/AsyncOpTracker.h"
#include "librbd/Watcher.h"
#include "librbd/managed_lock/Types.h"
#include "tools/rbd_mirror/instance_watcher/Types.h"
namespace librbd {
class AsioEngine;
class ImageCtx;
template <typename> class ManagedLock;
} // namespace librbd
namespace rbd {
namespace mirror {
template <typename> class InstanceReplayer;
template <typename> class Throttler;
template <typename> struct Threads;
template <typename ImageCtxT = librbd::ImageCtx>
class InstanceWatcher : protected librbd::Watcher {
using librbd::Watcher::unregister_watch; // Silence overloaded virtual warning
public:
static void get_instances(librados::IoCtx &io_ctx,
std::vector<std::string> *instance_ids,
Context *on_finish);
static void remove_instance(librados::IoCtx &io_ctx,
librbd::AsioEngine& asio_engine,
const std::string &instance_id,
Context *on_finish);
static InstanceWatcher *create(
librados::IoCtx &io_ctx, librbd::AsioEngine& asio_engine,
InstanceReplayer<ImageCtxT> *instance_replayer,
Throttler<ImageCtxT> *image_sync_throttler);
void destroy() {
delete this;
}
InstanceWatcher(librados::IoCtx &io_ctx, librbd::AsioEngine& asio_engine,
InstanceReplayer<ImageCtxT> *instance_replayer,
Throttler<ImageCtxT> *image_sync_throttler,
const std::string &instance_id);
~InstanceWatcher() override;
inline std::string &get_instance_id() {
return m_instance_id;
}
int init();
void shut_down();
void init(Context *on_finish);
void shut_down(Context *on_finish);
void remove(Context *on_finish);
void notify_image_acquire(const std::string &instance_id,
const std::string &global_image_id,
Context *on_notify_ack);
void notify_image_release(const std::string &instance_id,
const std::string &global_image_id,
Context *on_notify_ack);
void notify_peer_image_removed(const std::string &instance_id,
const std::string &global_image_id,
const std::string &peer_mirror_uuid,
Context *on_notify_ack);
void notify_sync_request(const std::string &sync_id, Context *on_sync_start);
bool cancel_sync_request(const std::string &sync_id);
void notify_sync_complete(const std::string &sync_id);
void cancel_notify_requests(const std::string &instance_id);
void handle_acquire_leader();
void handle_release_leader();
void handle_update_leader(const std::string &leader_instance_id);
private:
/**
* @verbatim
*
* BREAK_INSTANCE_LOCK -------\
* ^ |
* | (error) |
* GET_INSTANCE_LOCKER * * *>|
* ^ (remove) |
* | |
* <uninitialized> <----------------+---- WAIT_FOR_NOTIFY_OPS
* | (init) ^ | ^
* v (error) * | |
* REGISTER_INSTANCE * * * * * *|* *> UNREGISTER_INSTANCE
* | * | ^
* v (error) * v |
* CREATE_INSTANCE_OBJECT * * * * * *> REMOVE_INSTANCE_OBJECT
* | * ^
* v (error) * |
* REGISTER_WATCH * * * * * * * * * *> UNREGISTER_WATCH
* | * ^
* v (error) * |
* ACQUIRE_LOCK * * * * * * * * * * * RELEASE_LOCK
* | ^
* v (shut_down) |
* <watching> -------------------------------/
*
* @endverbatim
*/
struct C_NotifyInstanceRequest;
struct C_SyncRequest;
typedef std::pair<std::string, std::string> Id;
struct HandlePayloadVisitor : public boost::static_visitor<void> {
InstanceWatcher *instance_watcher;
std::string instance_id;
C_NotifyAck *on_notify_ack;
HandlePayloadVisitor(InstanceWatcher *instance_watcher,
const std::string &instance_id,
C_NotifyAck *on_notify_ack)
: instance_watcher(instance_watcher), instance_id(instance_id),
on_notify_ack(on_notify_ack) {
}
template <typename Payload>
inline void operator()(const Payload &payload) const {
instance_watcher->handle_payload(instance_id, payload, on_notify_ack);
}
};
struct Request {
std::string instance_id;
uint64_t request_id;
C_NotifyAck *on_notify_ack = nullptr;
Request(const std::string &instance_id, uint64_t request_id)
: instance_id(instance_id), request_id(request_id) {
}
inline bool operator<(const Request &rhs) const {
return instance_id < rhs.instance_id ||
(instance_id == rhs.instance_id && request_id < rhs.request_id);
}
};
Threads<ImageCtxT> *m_threads;
InstanceReplayer<ImageCtxT> *m_instance_replayer;
Throttler<ImageCtxT> *m_image_sync_throttler;
std::string m_instance_id;
mutable ceph::mutex m_lock;
librbd::ManagedLock<ImageCtxT> *m_instance_lock;
Context *m_on_finish = nullptr;
int m_ret_val = 0;
std::string m_leader_instance_id;
librbd::managed_lock::Locker m_instance_locker;
std::set<std::pair<std::string, C_NotifyInstanceRequest *>> m_notify_ops;
AsyncOpTracker m_notify_op_tracker;
uint64_t m_request_seq = 0;
std::set<Request> m_requests;
std::set<C_NotifyInstanceRequest *> m_suspended_ops;
std::map<std::string, C_SyncRequest *> m_inflight_sync_reqs;
inline bool is_leader() const {
return m_leader_instance_id == m_instance_id;
}
void register_instance();
void handle_register_instance(int r);
void create_instance_object();
void handle_create_instance_object(int r);
void register_watch();
void handle_register_watch(int r);
void acquire_lock();
void handle_acquire_lock(int r);
void release_lock();
void handle_release_lock(int r);
void unregister_watch();
void handle_unregister_watch(int r);
void remove_instance_object();
void handle_remove_instance_object(int r);
void unregister_instance();
void handle_unregister_instance(int r);
void wait_for_notify_ops();
void handle_wait_for_notify_ops(int r);
void get_instance_locker();
void handle_get_instance_locker(int r);
void break_instance_lock();
void handle_break_instance_lock(int r);
void suspend_notify_request(C_NotifyInstanceRequest *req);
bool unsuspend_notify_request(C_NotifyInstanceRequest *req);
void unsuspend_notify_requests();
void notify_sync_complete(const ceph::mutex& lock, const std::string &sync_id);
void handle_notify_sync_request(C_SyncRequest *sync_ctx, int r);
void handle_notify_sync_complete(C_SyncRequest *sync_ctx, int r);
void notify_sync_start(const std::string &instance_id,
const std::string &sync_id);
Context *prepare_request(const std::string &instance_id, uint64_t request_id,
C_NotifyAck *on_notify_ack);
void complete_request(const std::string &instance_id, uint64_t request_id,
int r);
void handle_notify(uint64_t notify_id, uint64_t handle,
uint64_t notifier_id, bufferlist &bl) override;
void handle_image_acquire(const std::string &global_image_id,
Context *on_finish);
void handle_image_release(const std::string &global_image_id,
Context *on_finish);
void handle_peer_image_removed(const std::string &global_image_id,
const std::string &peer_mirror_uuid,
Context *on_finish);
void handle_sync_request(const std::string &instance_id,
const std::string &sync_id, Context *on_finish);
void handle_sync_start(const std::string &instance_id,
const std::string &sync_id, Context *on_finish);
void handle_payload(const std::string &instance_id,
const instance_watcher::ImageAcquirePayload &payload,
C_NotifyAck *on_notify_ack);
void handle_payload(const std::string &instance_id,
const instance_watcher::ImageReleasePayload &payload,
C_NotifyAck *on_notify_ack);
void handle_payload(const std::string &instance_id,
const instance_watcher::PeerImageRemovedPayload &payload,
C_NotifyAck *on_notify_ack);
void handle_payload(const std::string &instance_id,
const instance_watcher::SyncRequestPayload &payload,
C_NotifyAck *on_notify_ack);
void handle_payload(const std::string &instance_id,
const instance_watcher::SyncStartPayload &payload,
C_NotifyAck *on_notify_ack);
void handle_payload(const std::string &instance_id,
const instance_watcher::UnknownPayload &payload,
C_NotifyAck *on_notify_ack);
};
} // namespace mirror
} // namespace rbd
#endif // CEPH_RBD_MIRROR_INSTANCE_WATCHER_H
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