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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- | |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
4 | #ifndef CEPH_RBD_MIRROR_IMAGE_REPLAYER_H | |
5 | #define CEPH_RBD_MIRROR_IMAGE_REPLAYER_H | |
6 | ||
7 | #include "common/AsyncOpTracker.h" | |
8 | #include "common/Mutex.h" | |
9 | #include "common/WorkQueue.h" | |
10 | #include "include/rados/librados.hpp" | |
11 | #include "cls/journal/cls_journal_types.h" | |
12 | #include "cls/rbd/cls_rbd_types.h" | |
13 | #include "journal/JournalMetadataListener.h" | |
14 | #include "journal/ReplayEntry.h" | |
15 | #include "librbd/ImageCtx.h" | |
16 | #include "librbd/journal/Types.h" | |
17 | #include "librbd/journal/TypeTraits.h" | |
18 | #include "ProgressContext.h" | |
19 | #include "types.h" | |
20 | #include "tools/rbd_mirror/image_replayer/Types.h" | |
21 | ||
22 | #include <boost/noncopyable.hpp> | |
23 | #include <boost/optional.hpp> | |
24 | ||
25 | #include <set> | |
26 | #include <map> | |
27 | #include <atomic> | |
28 | #include <string> | |
29 | #include <vector> | |
30 | ||
31 | class AdminSocketHook; | |
32 | ||
33 | namespace journal { | |
34 | ||
35 | class Journaler; | |
36 | class ReplayHandler; | |
37 | ||
38 | } | |
39 | ||
40 | namespace librbd { | |
41 | ||
42 | class ImageCtx; | |
43 | namespace journal { template <typename> class Replay; } | |
44 | ||
45 | } | |
46 | ||
47 | namespace rbd { | |
48 | namespace mirror { | |
49 | ||
50 | template <typename> struct ImageDeleter; | |
51 | template <typename> struct InstanceWatcher; | |
52 | template <typename> struct Threads; | |
53 | ||
54 | namespace image_replayer { template <typename> class BootstrapRequest; } | |
55 | namespace image_replayer { template <typename> class EventPreprocessor; } | |
56 | namespace image_replayer { template <typename> class ReplayStatusFormatter; } | |
57 | ||
58 | /** | |
59 | * Replays changes from a remote cluster for a single image. | |
60 | */ | |
61 | template <typename ImageCtxT = librbd::ImageCtx> | |
62 | class ImageReplayer { | |
63 | public: | |
64 | static ImageReplayer *create( | |
65 | Threads<ImageCtxT> *threads, ImageDeleter<ImageCtxT>* image_deleter, | |
66 | InstanceWatcher<ImageCtxT> *instance_watcher, | |
67 | RadosRef local, const std::string &local_mirror_uuid, int64_t local_pool_id, | |
68 | const std::string &global_image_id) { | |
69 | return new ImageReplayer(threads, image_deleter, instance_watcher, | |
70 | local, local_mirror_uuid, local_pool_id, | |
71 | global_image_id); | |
72 | } | |
73 | void destroy() { | |
74 | delete this; | |
75 | } | |
76 | ||
77 | ImageReplayer(Threads<ImageCtxT> *threads, | |
78 | ImageDeleter<ImageCtxT>* image_deleter, | |
79 | InstanceWatcher<ImageCtxT> *instance_watcher, | |
80 | RadosRef local, const std::string &local_mirror_uuid, | |
81 | int64_t local_pool_id, const std::string &global_image_id); | |
82 | virtual ~ImageReplayer(); | |
83 | ImageReplayer(const ImageReplayer&) = delete; | |
84 | ImageReplayer& operator=(const ImageReplayer&) = delete; | |
85 | ||
86 | bool is_stopped() { Mutex::Locker l(m_lock); return is_stopped_(); } | |
87 | bool is_running() { Mutex::Locker l(m_lock); return is_running_(); } | |
88 | bool is_replaying() { Mutex::Locker l(m_lock); return is_replaying_(); } | |
89 | ||
90 | std::string get_name() { Mutex::Locker l(m_lock); return m_name; }; | |
91 | void set_state_description(int r, const std::string &desc); | |
92 | ||
93 | // TODO temporary until policy handles release of image replayers | |
94 | inline bool is_finished() const { | |
95 | Mutex::Locker locker(m_lock); | |
96 | return m_finished; | |
97 | } | |
98 | inline void set_finished(bool finished) { | |
99 | Mutex::Locker locker(m_lock); | |
100 | m_finished = finished; | |
101 | } | |
102 | ||
103 | inline bool is_blacklisted() const { | |
104 | Mutex::Locker locker(m_lock); | |
105 | return (m_last_r == -EBLACKLISTED); | |
106 | } | |
107 | ||
108 | image_replayer::HealthState get_health_state() const; | |
109 | ||
110 | void add_peer(const std::string &peer_uuid, librados::IoCtx &remote_io_ctx); | |
111 | ||
112 | inline int64_t get_local_pool_id() const { | |
113 | return m_local_pool_id; | |
114 | } | |
115 | inline const std::string& get_global_image_id() const { | |
116 | return m_global_image_id; | |
117 | } | |
118 | ||
119 | void start(Context *on_finish = nullptr, bool manual = false); | |
120 | void stop(Context *on_finish = nullptr, bool manual = false, | |
121 | int r = 0, const std::string& desc = ""); | |
122 | void restart(Context *on_finish = nullptr); | |
123 | void flush(Context *on_finish = nullptr); | |
124 | ||
125 | void resync_image(Context *on_finish=nullptr); | |
126 | ||
127 | void print_status(Formatter *f, stringstream *ss); | |
128 | ||
129 | virtual void handle_replay_ready(); | |
130 | virtual void handle_replay_complete(int r, const std::string &error_desc); | |
131 | ||
132 | protected: | |
133 | /** | |
134 | * @verbatim | |
135 | * (error) | |
136 | * <uninitialized> <------------------------------------ FAIL | |
137 | * | ^ | |
138 | * v * | |
139 | * <starting> * | |
140 | * | * | |
141 | * v * | |
142 | * WAIT_FOR_DELETION * | |
143 | * | * | |
144 | * v (error) * | |
145 | * PREPARE_LOCAL_IMAGE * * * * * * * * * * * * * * * * * * | |
146 | * | * | |
147 | * v (error) * | |
148 | * PREPARE_REMOTE_IMAGE * * * * * * * * * * * * * * * * * * | |
149 | * | * | |
150 | * v (error) * | |
151 | * BOOTSTRAP_IMAGE * * * * * * * * * * * * * * * * * * * * | |
152 | * | * | |
153 | * v (error) * | |
154 | * INIT_REMOTE_JOURNALER * * * * * * * * * * * * * * * * * | |
155 | * | * | |
156 | * v (error) * | |
157 | * START_REPLAY * * * * * * * * * * * * * * * * * * * * * * | |
158 | * | | |
159 | * | /--------------------------------------------\ | |
160 | * | | | | |
161 | * v v (asok flush) | | |
162 | * REPLAYING -------------> LOCAL_REPLAY_FLUSH | | |
163 | * | \ | | | |
164 | * | | v | | |
165 | * | | FLUSH_COMMIT_POSITION | | |
166 | * | | | | | |
167 | * | | \--------------------/| | |
168 | * | | | | |
169 | * | | (entries available) | | |
170 | * | \-----------> REPLAY_READY | | |
171 | * | | | | |
172 | * | | (skip if not | | |
173 | * | v needed) (error) | |
174 | * | REPLAY_FLUSH * * * * * * * * * | |
175 | * | | | * | |
176 | * | | (skip if not | * | |
177 | * | v needed) (error) * | |
178 | * | GET_REMOTE_TAG * * * * * * * * | |
179 | * | | | * | |
180 | * | | (skip if not | * | |
181 | * | v needed) (error) * | |
182 | * | ALLOCATE_LOCAL_TAG * * * * * * | |
183 | * | | | * | |
184 | * | v (error) * | |
185 | * | PREPROCESS_ENTRY * * * * * * * | |
186 | * | | | * | |
187 | * | v (error) * | |
188 | * | PROCESS_ENTRY * * * * * * * * * | |
189 | * | | | * | |
190 | * | \---------------------/ * | |
191 | * v * | |
192 | * REPLAY_COMPLETE < * * * * * * * * * * * * * * * * * * * | |
193 | * | | |
194 | * v | |
195 | * JOURNAL_REPLAY_SHUT_DOWN | |
196 | * | | |
197 | * v | |
198 | * LOCAL_IMAGE_CLOSE | |
199 | * | | |
200 | * v | |
201 | * <stopped> | |
202 | * | |
203 | * @endverbatim | |
204 | */ | |
205 | ||
206 | virtual void on_start_fail(int r, const std::string &desc = ""); | |
207 | virtual bool on_start_interrupted(); | |
208 | ||
209 | virtual void on_stop_journal_replay(int r = 0, const std::string &desc = ""); | |
210 | ||
211 | virtual void on_flush_local_replay_flush_start(Context *on_flush); | |
212 | virtual void on_flush_local_replay_flush_finish(Context *on_flush, int r); | |
213 | virtual void on_flush_flush_commit_position_start(Context *on_flush); | |
214 | virtual void on_flush_flush_commit_position_finish(Context *on_flush, int r); | |
215 | ||
216 | bool on_replay_interrupted(); | |
217 | ||
218 | private: | |
219 | typedef typename librbd::journal::TypeTraits<ImageCtxT>::ReplayEntry ReplayEntry; | |
220 | ||
221 | enum State { | |
222 | STATE_UNKNOWN, | |
223 | STATE_STARTING, | |
224 | STATE_REPLAYING, | |
225 | STATE_REPLAY_FLUSHING, | |
226 | STATE_STOPPING, | |
227 | STATE_STOPPED, | |
228 | }; | |
229 | ||
230 | struct RemoteImage { | |
231 | std::string mirror_uuid; | |
232 | std::string image_id; | |
233 | librados::IoCtx io_ctx; | |
234 | ||
235 | RemoteImage() { | |
236 | } | |
237 | RemoteImage(const Peer& peer) : io_ctx(peer.io_ctx) { | |
238 | } | |
239 | }; | |
240 | ||
241 | typedef typename librbd::journal::TypeTraits<ImageCtxT>::Journaler Journaler; | |
242 | typedef boost::optional<State> OptionalState; | |
243 | typedef boost::optional<cls::rbd::MirrorImageStatusState> | |
244 | OptionalMirrorImageStatusState; | |
245 | ||
246 | struct JournalListener : public librbd::journal::Listener { | |
247 | ImageReplayer *img_replayer; | |
248 | ||
249 | JournalListener(ImageReplayer *img_replayer) | |
250 | : img_replayer(img_replayer) { | |
251 | } | |
252 | ||
253 | void handle_close() override { | |
254 | img_replayer->on_stop_journal_replay(); | |
255 | } | |
256 | ||
257 | void handle_promoted() override { | |
258 | img_replayer->on_stop_journal_replay(0, "force promoted"); | |
259 | } | |
260 | ||
261 | void handle_resync() override { | |
262 | img_replayer->resync_image(); | |
263 | } | |
264 | }; | |
265 | ||
266 | class BootstrapProgressContext : public ProgressContext { | |
267 | public: | |
268 | BootstrapProgressContext(ImageReplayer<ImageCtxT> *replayer) : | |
269 | replayer(replayer) { | |
270 | } | |
271 | ||
272 | void update_progress(const std::string &description, | |
273 | bool flush = true) override; | |
274 | private: | |
275 | ImageReplayer<ImageCtxT> *replayer; | |
276 | }; | |
277 | ||
278 | Threads<ImageCtxT> *m_threads; | |
279 | ImageDeleter<ImageCtxT>* m_image_deleter; | |
280 | InstanceWatcher<ImageCtxT> *m_instance_watcher; | |
281 | ||
282 | Peers m_peers; | |
283 | RemoteImage m_remote_image; | |
284 | ||
285 | RadosRef m_local; | |
286 | std::string m_local_mirror_uuid; | |
287 | int64_t m_local_pool_id; | |
288 | std::string m_local_image_id; | |
289 | std::string m_global_image_id; | |
290 | std::string m_name; | |
291 | ||
292 | mutable Mutex m_lock; | |
293 | State m_state = STATE_STOPPED; | |
294 | std::string m_state_desc; | |
295 | ||
296 | OptionalMirrorImageStatusState m_mirror_image_status_state = boost::none; | |
297 | int m_last_r = 0; | |
298 | ||
299 | BootstrapProgressContext m_progress_cxt; | |
300 | ||
301 | bool m_finished = false; | |
302 | bool m_delete_requested = false; | |
303 | bool m_resync_requested = false; | |
304 | ||
305 | image_replayer::EventPreprocessor<ImageCtxT> *m_event_preprocessor = nullptr; | |
306 | image_replayer::ReplayStatusFormatter<ImageCtxT> *m_replay_status_formatter = | |
307 | nullptr; | |
308 | librados::IoCtx m_local_ioctx; | |
309 | ImageCtxT *m_local_image_ctx = nullptr; | |
310 | std::string m_local_image_tag_owner; | |
311 | ||
312 | decltype(ImageCtxT::journal) m_local_journal = nullptr; | |
313 | librbd::journal::Replay<ImageCtxT> *m_local_replay = nullptr; | |
314 | Journaler* m_remote_journaler = nullptr; | |
315 | ::journal::ReplayHandler *m_replay_handler = nullptr; | |
316 | librbd::journal::Listener *m_journal_listener; | |
317 | ||
318 | Context *m_on_start_finish = nullptr; | |
319 | Context *m_on_stop_finish = nullptr; | |
320 | Context *m_update_status_task = nullptr; | |
321 | int m_update_status_interval = 0; | |
322 | librados::AioCompletion *m_update_status_comp = nullptr; | |
323 | bool m_stop_requested = false; | |
324 | bool m_manual_stop = false; | |
325 | ||
326 | AdminSocketHook *m_asok_hook = nullptr; | |
327 | ||
328 | image_replayer::BootstrapRequest<ImageCtxT> *m_bootstrap_request = nullptr; | |
329 | ||
330 | uint32_t m_in_flight_status_updates = 0; | |
331 | bool m_update_status_requested = false; | |
332 | Context *m_on_update_status_finish = nullptr; | |
333 | ||
334 | librbd::journal::MirrorPeerClientMeta m_client_meta; | |
335 | ||
336 | ReplayEntry m_replay_entry; | |
337 | bool m_replay_tag_valid = false; | |
338 | uint64_t m_replay_tag_tid = 0; | |
339 | cls::journal::Tag m_replay_tag; | |
340 | librbd::journal::TagData m_replay_tag_data; | |
341 | librbd::journal::EventEntry m_event_entry; | |
342 | AsyncOpTracker m_event_replay_tracker; | |
343 | Context *m_delayed_preprocess_task = nullptr; | |
344 | ||
345 | struct RemoteJournalerListener : public ::journal::JournalMetadataListener { | |
346 | ImageReplayer *replayer; | |
347 | ||
348 | RemoteJournalerListener(ImageReplayer *replayer) : replayer(replayer) { } | |
349 | ||
350 | void handle_update(::journal::JournalMetadata *) override; | |
351 | } m_remote_listener; | |
352 | ||
353 | struct C_ReplayCommitted : public Context { | |
354 | ImageReplayer *replayer; | |
355 | ReplayEntry replay_entry; | |
356 | ||
357 | C_ReplayCommitted(ImageReplayer *replayer, | |
358 | ReplayEntry &&replay_entry) | |
359 | : replayer(replayer), replay_entry(std::move(replay_entry)) { | |
360 | } | |
361 | void finish(int r) override { | |
362 | replayer->handle_process_entry_safe(replay_entry, r); | |
363 | } | |
364 | }; | |
365 | ||
366 | static std::string to_string(const State state); | |
367 | ||
368 | bool is_stopped_() const { | |
369 | return m_state == STATE_STOPPED; | |
370 | } | |
371 | bool is_running_() const { | |
372 | return !is_stopped_() && m_state != STATE_STOPPING && !m_stop_requested; | |
373 | } | |
374 | bool is_replaying_() const { | |
375 | return (m_state == STATE_REPLAYING || | |
376 | m_state == STATE_REPLAY_FLUSHING); | |
377 | } | |
378 | ||
379 | bool update_mirror_image_status(bool force, const OptionalState &state); | |
380 | bool start_mirror_image_status_update(bool force, bool restarting); | |
381 | void finish_mirror_image_status_update(); | |
382 | void queue_mirror_image_status_update(const OptionalState &state); | |
383 | void send_mirror_status_update(const OptionalState &state); | |
384 | void handle_mirror_status_update(int r); | |
385 | void reschedule_update_status_task(int new_interval = 0); | |
386 | ||
387 | void shut_down(int r); | |
388 | void handle_shut_down(int r); | |
389 | void handle_remote_journal_metadata_updated(); | |
390 | ||
391 | void wait_for_deletion(); | |
392 | void handle_wait_for_deletion(int r); | |
393 | ||
394 | void prepare_local_image(); | |
395 | void handle_prepare_local_image(int r); | |
396 | ||
397 | void prepare_remote_image(); | |
398 | void handle_prepare_remote_image(int r); | |
399 | ||
400 | void bootstrap(); | |
401 | void handle_bootstrap(int r); | |
402 | ||
403 | void init_remote_journaler(); | |
404 | void handle_init_remote_journaler(int r); | |
405 | ||
406 | void start_replay(); | |
407 | void handle_start_replay(int r); | |
408 | ||
409 | void replay_flush(); | |
410 | void handle_replay_flush(int r); | |
411 | ||
412 | void get_remote_tag(); | |
413 | void handle_get_remote_tag(int r); | |
414 | ||
415 | void allocate_local_tag(); | |
416 | void handle_allocate_local_tag(int r); | |
417 | ||
418 | void preprocess_entry(); | |
419 | void handle_preprocess_entry_ready(int r); | |
420 | void handle_preprocess_entry_safe(int r); | |
421 | ||
422 | void process_entry(); | |
423 | void handle_process_entry_ready(int r); | |
424 | void handle_process_entry_safe(const ReplayEntry& replay_entry, int r); | |
425 | ||
426 | void register_admin_socket_hook(); | |
427 | void unregister_admin_socket_hook(); | |
428 | ||
429 | void on_name_changed(); | |
430 | }; | |
431 | ||
432 | } // namespace mirror | |
433 | } // namespace rbd | |
434 | ||
435 | extern template class rbd::mirror::ImageReplayer<librbd::ImageCtx>; | |
436 | ||
437 | #endif // CEPH_RBD_MIRROR_IMAGE_REPLAYER_H |