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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_INSTANCES_H
#define CEPH_RBD_MIRROR_INSTANCES_H
#include <map>
#include <vector>
#include "include/buffer_fwd.h"
#include "include/rados/librados_fwd.hpp"
#include "common/AsyncOpTracker.h"
#include "common/Mutex.h"
#include "librbd/Watcher.h"
#include "tools/rbd_mirror/instances/Types.h"
namespace librbd { class ImageCtx; }
namespace rbd {
namespace mirror {
template <typename> struct Threads;
template <typename ImageCtxT = librbd::ImageCtx>
class Instances {
public:
typedef std::vector<std::string> InstanceIds;
static Instances *create(Threads<ImageCtxT> *threads,
librados::IoCtx &ioctx,
const std::string& instance_id,
instances::Listener& listener) {
return new Instances(threads, ioctx, instance_id, listener);
}
void destroy() {
delete this;
}
Instances(Threads<ImageCtxT> *threads, librados::IoCtx &ioctx,
const std::string& instance_id, instances::Listener& listener);
virtual ~Instances();
void init(Context *on_finish);
void shut_down(Context *on_finish);
void unblock_listener();
void acked(const InstanceIds& instance_ids);
void list(std::vector<std::string> *instance_ids);
private:
/**
* @verbatim
*
* <uninitialized> <---------------------\
* | (init) ^ |
* v (error) * |
* GET_INSTANCES * * * * * WAIT_FOR_OPS
* | ^
* v (shut_down) |
* <initialized> ------------------------/
* .
* . (remove_instance)
* v
* REMOVE_INSTANCE
*
* @endverbatim
*/
enum InstanceState {
INSTANCE_STATE_ADDING,
INSTANCE_STATE_IDLE,
INSTANCE_STATE_REMOVING
};
struct Instance {
utime_t acked_time{};
InstanceState state = INSTANCE_STATE_ADDING;
};
struct C_NotifyBase : public Context {
Instances *instances;
InstanceIds instance_ids;
C_NotifyBase(Instances *instances, const InstanceIds& instance_ids)
: instances(instances), instance_ids(instance_ids) {
instances->m_async_op_tracker.start_op();
}
void finish(int r) override {
execute();
instances->m_async_op_tracker.finish_op();
}
virtual void execute() = 0;
};
struct C_HandleAcked : public C_NotifyBase {
C_HandleAcked(Instances *instances, const InstanceIds& instance_ids)
: C_NotifyBase(instances, instance_ids) {
}
void execute() override {
this->instances->handle_acked(this->instance_ids);
}
};
struct C_NotifyInstancesAdded : public C_NotifyBase {
C_NotifyInstancesAdded(Instances *instances,
const InstanceIds& instance_ids)
: C_NotifyBase(instances, instance_ids) {
}
void execute() override {
this->instances->notify_instances_added(this->instance_ids);
}
};
struct C_NotifyInstancesRemoved : public C_NotifyBase {
C_NotifyInstancesRemoved(Instances *instances,
const InstanceIds& instance_ids)
: C_NotifyBase(instances, instance_ids) {
}
void execute() override {
this->instances->notify_instances_removed(this->instance_ids);
}
};
Threads<ImageCtxT> *m_threads;
librados::IoCtx &m_ioctx;
std::string m_instance_id;
instances::Listener& m_listener;
CephContext *m_cct;
Mutex m_lock;
InstanceIds m_instance_ids;
std::map<std::string, Instance> m_instances;
Context *m_on_finish = nullptr;
AsyncOpTracker m_async_op_tracker;
Context *m_timer_task = nullptr;
bool m_listener_blocked = true;
void handle_acked(const InstanceIds& instance_ids);
void notify_instances_added(const InstanceIds& instance_ids);
void notify_instances_removed(const InstanceIds& instance_ids);
void get_instances();
void handle_get_instances(int r);
void wait_for_ops();
void handle_wait_for_ops(int r);
void remove_instances(const utime_t& time);
void handle_remove_instances(int r, const InstanceIds& instance_ids);
void cancel_remove_task();
void schedule_remove_task(const utime_t& time);
};
} // namespace mirror
} // namespace rbd
#endif // CEPH_RBD_MIRROR_INSTANCES_H
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