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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 | #include <boost/range/adaptor/map.hpp> | |
5 | ||
6 | #include "common/Formatter.h" | |
7 | #include "common/admin_socket.h" | |
8 | #include "common/debug.h" | |
9 | #include "common/errno.h" | |
10 | #include "librbd/ImageCtx.h" | |
11 | #include "Mirror.h" | |
12 | #include "Threads.h" | |
13 | #include "ImageSync.h" | |
14 | ||
15 | #define dout_context g_ceph_context | |
16 | #define dout_subsys ceph_subsys_rbd_mirror | |
17 | #undef dout_prefix | |
18 | #define dout_prefix *_dout << "rbd::mirror::Mirror: " << this << " " \ | |
19 | << __func__ << ": " | |
20 | ||
21 | using std::list; | |
22 | using std::map; | |
23 | using std::set; | |
24 | using std::string; | |
25 | using std::unique_ptr; | |
26 | using std::vector; | |
27 | ||
28 | using librados::Rados; | |
29 | using librados::IoCtx; | |
30 | using librbd::mirror_peer_t; | |
31 | ||
32 | namespace rbd { | |
33 | namespace mirror { | |
34 | ||
35 | namespace { | |
36 | ||
37 | class MirrorAdminSocketCommand { | |
38 | public: | |
39 | virtual ~MirrorAdminSocketCommand() {} | |
40 | virtual bool call(Formatter *f, stringstream *ss) = 0; | |
41 | }; | |
42 | ||
43 | class StatusCommand : public MirrorAdminSocketCommand { | |
44 | public: | |
45 | explicit StatusCommand(Mirror *mirror) : mirror(mirror) {} | |
46 | ||
47 | bool call(Formatter *f, stringstream *ss) override { | |
48 | mirror->print_status(f, ss); | |
49 | return true; | |
50 | } | |
51 | ||
52 | private: | |
53 | Mirror *mirror; | |
54 | }; | |
55 | ||
56 | class StartCommand : public MirrorAdminSocketCommand { | |
57 | public: | |
58 | explicit StartCommand(Mirror *mirror) : mirror(mirror) {} | |
59 | ||
60 | bool call(Formatter *f, stringstream *ss) override { | |
61 | mirror->start(); | |
62 | return true; | |
63 | } | |
64 | ||
65 | private: | |
66 | Mirror *mirror; | |
67 | }; | |
68 | ||
69 | class StopCommand : public MirrorAdminSocketCommand { | |
70 | public: | |
71 | explicit StopCommand(Mirror *mirror) : mirror(mirror) {} | |
72 | ||
73 | bool call(Formatter *f, stringstream *ss) override { | |
74 | mirror->stop(); | |
75 | return true; | |
76 | } | |
77 | ||
78 | private: | |
79 | Mirror *mirror; | |
80 | }; | |
81 | ||
82 | class RestartCommand : public MirrorAdminSocketCommand { | |
83 | public: | |
84 | explicit RestartCommand(Mirror *mirror) : mirror(mirror) {} | |
85 | ||
86 | bool call(Formatter *f, stringstream *ss) override { | |
87 | mirror->restart(); | |
88 | return true; | |
89 | } | |
90 | ||
91 | private: | |
92 | Mirror *mirror; | |
93 | }; | |
94 | ||
95 | class FlushCommand : public MirrorAdminSocketCommand { | |
96 | public: | |
97 | explicit FlushCommand(Mirror *mirror) : mirror(mirror) {} | |
98 | ||
99 | bool call(Formatter *f, stringstream *ss) override { | |
100 | mirror->flush(); | |
101 | return true; | |
102 | } | |
103 | ||
104 | private: | |
105 | Mirror *mirror; | |
106 | }; | |
107 | ||
108 | class LeaderReleaseCommand : public MirrorAdminSocketCommand { | |
109 | public: | |
110 | explicit LeaderReleaseCommand(Mirror *mirror) : mirror(mirror) {} | |
111 | ||
112 | bool call(Formatter *f, stringstream *ss) override { | |
113 | mirror->release_leader(); | |
114 | return true; | |
115 | } | |
116 | ||
117 | private: | |
118 | Mirror *mirror; | |
119 | }; | |
120 | ||
121 | } // anonymous namespace | |
122 | ||
123 | class MirrorAdminSocketHook : public AdminSocketHook { | |
124 | public: | |
125 | MirrorAdminSocketHook(CephContext *cct, Mirror *mirror) : | |
126 | admin_socket(cct->get_admin_socket()) { | |
127 | std::string command; | |
128 | int r; | |
129 | ||
130 | command = "rbd mirror status"; | |
131 | r = admin_socket->register_command(command, command, this, | |
132 | "get status for rbd mirror"); | |
133 | if (r == 0) { | |
134 | commands[command] = new StatusCommand(mirror); | |
135 | } | |
136 | ||
137 | command = "rbd mirror start"; | |
138 | r = admin_socket->register_command(command, command, this, | |
139 | "start rbd mirror"); | |
140 | if (r == 0) { | |
141 | commands[command] = new StartCommand(mirror); | |
142 | } | |
143 | ||
144 | command = "rbd mirror stop"; | |
145 | r = admin_socket->register_command(command, command, this, | |
146 | "stop rbd mirror"); | |
147 | if (r == 0) { | |
148 | commands[command] = new StopCommand(mirror); | |
149 | } | |
150 | ||
151 | command = "rbd mirror restart"; | |
152 | r = admin_socket->register_command(command, command, this, | |
153 | "restart rbd mirror"); | |
154 | if (r == 0) { | |
155 | commands[command] = new RestartCommand(mirror); | |
156 | } | |
157 | ||
158 | command = "rbd mirror flush"; | |
159 | r = admin_socket->register_command(command, command, this, | |
160 | "flush rbd mirror"); | |
161 | if (r == 0) { | |
162 | commands[command] = new FlushCommand(mirror); | |
163 | } | |
164 | ||
165 | command = "rbd mirror leader release"; | |
166 | r = admin_socket->register_command(command, command, this, | |
167 | "release rbd mirror leader"); | |
168 | if (r == 0) { | |
169 | commands[command] = new LeaderReleaseCommand(mirror); | |
170 | } | |
171 | } | |
172 | ||
173 | ~MirrorAdminSocketHook() override { | |
174 | for (Commands::const_iterator i = commands.begin(); i != commands.end(); | |
175 | ++i) { | |
176 | (void)admin_socket->unregister_command(i->first); | |
177 | delete i->second; | |
178 | } | |
179 | } | |
180 | ||
181 | bool call(std::string command, cmdmap_t& cmdmap, std::string format, | |
182 | bufferlist& out) override { | |
183 | Commands::const_iterator i = commands.find(command); | |
184 | assert(i != commands.end()); | |
185 | Formatter *f = Formatter::create(format); | |
186 | stringstream ss; | |
187 | bool r = i->second->call(f, &ss); | |
188 | delete f; | |
189 | out.append(ss); | |
190 | return r; | |
191 | } | |
192 | ||
193 | private: | |
194 | typedef std::map<std::string, MirrorAdminSocketCommand*> Commands; | |
195 | ||
196 | AdminSocket *admin_socket; | |
197 | Commands commands; | |
198 | }; | |
199 | ||
200 | Mirror::Mirror(CephContext *cct, const std::vector<const char*> &args) : | |
201 | m_cct(cct), | |
202 | m_args(args), | |
203 | m_lock("rbd::mirror::Mirror"), | |
204 | m_local(new librados::Rados()), | |
205 | m_asok_hook(new MirrorAdminSocketHook(cct, this)) | |
206 | { | |
207 | cct->lookup_or_create_singleton_object<Threads<librbd::ImageCtx> >( | |
208 | m_threads, "rbd_mirror::threads"); | |
209 | } | |
210 | ||
211 | Mirror::~Mirror() | |
212 | { | |
213 | delete m_asok_hook; | |
214 | } | |
215 | ||
216 | void Mirror::handle_signal(int signum) | |
217 | { | |
218 | m_stopping = true; | |
219 | { | |
220 | Mutex::Locker l(m_lock); | |
221 | m_cond.Signal(); | |
222 | } | |
223 | } | |
224 | ||
225 | int Mirror::init() | |
226 | { | |
227 | int r = m_local->init_with_context(m_cct); | |
228 | if (r < 0) { | |
229 | derr << "could not initialize rados handle" << dendl; | |
230 | return r; | |
231 | } | |
232 | ||
233 | r = m_local->connect(); | |
234 | if (r < 0) { | |
235 | derr << "error connecting to local cluster" << dendl; | |
236 | return r; | |
237 | } | |
238 | ||
239 | m_local_cluster_watcher.reset(new ClusterWatcher(m_local, m_lock)); | |
240 | ||
241 | m_image_deleter.reset(new ImageDeleter(m_threads->work_queue, | |
242 | m_threads->timer, | |
243 | &m_threads->timer_lock)); | |
244 | ||
245 | m_image_sync_throttler.reset(new ImageSyncThrottler<>()); | |
246 | ||
247 | return r; | |
248 | } | |
249 | ||
250 | void Mirror::run() | |
251 | { | |
252 | dout(20) << "enter" << dendl; | |
253 | while (!m_stopping) { | |
254 | m_local_cluster_watcher->refresh_pools(); | |
255 | Mutex::Locker l(m_lock); | |
256 | if (!m_manual_stop) { | |
257 | update_pool_replayers(m_local_cluster_watcher->get_pool_peers()); | |
258 | } | |
259 | m_cond.WaitInterval( | |
260 | m_lock, | |
261 | utime_t(m_cct->_conf->rbd_mirror_pool_replayers_refresh_interval, 0)); | |
262 | } | |
263 | ||
264 | // stop all pool replayers in parallel | |
265 | Mutex::Locker locker(m_lock); | |
266 | for (auto &pool_replayer : m_pool_replayers) { | |
267 | pool_replayer.second->stop(false); | |
268 | } | |
269 | dout(20) << "return" << dendl; | |
270 | } | |
271 | ||
272 | void Mirror::print_status(Formatter *f, stringstream *ss) | |
273 | { | |
274 | dout(20) << "enter" << dendl; | |
275 | ||
276 | Mutex::Locker l(m_lock); | |
277 | ||
278 | if (m_stopping) { | |
279 | return; | |
280 | } | |
281 | ||
282 | if (f) { | |
283 | f->open_object_section("mirror_status"); | |
284 | f->open_array_section("pool_replayers"); | |
285 | }; | |
286 | ||
287 | for (auto &pool_replayer : m_pool_replayers) { | |
288 | pool_replayer.second->print_status(f, ss); | |
289 | } | |
290 | ||
291 | if (f) { | |
292 | f->close_section(); | |
293 | f->open_object_section("image_deleter"); | |
294 | } | |
295 | ||
296 | m_image_deleter->print_status(f, ss); | |
297 | ||
298 | if (f) { | |
299 | f->close_section(); | |
300 | f->open_object_section("sync_throttler"); | |
301 | } | |
302 | ||
303 | m_image_sync_throttler->print_status(f, ss); | |
304 | ||
305 | if (f) { | |
306 | f->close_section(); | |
307 | f->close_section(); | |
308 | f->flush(*ss); | |
309 | } | |
310 | } | |
311 | ||
312 | void Mirror::start() | |
313 | { | |
314 | dout(20) << "enter" << dendl; | |
315 | Mutex::Locker l(m_lock); | |
316 | ||
317 | if (m_stopping) { | |
318 | return; | |
319 | } | |
320 | ||
321 | m_manual_stop = false; | |
322 | ||
323 | for (auto &pool_replayer : m_pool_replayers) { | |
324 | pool_replayer.second->start(); | |
325 | } | |
326 | } | |
327 | ||
328 | void Mirror::stop() | |
329 | { | |
330 | dout(20) << "enter" << dendl; | |
331 | Mutex::Locker l(m_lock); | |
332 | ||
333 | if (m_stopping) { | |
334 | return; | |
335 | } | |
336 | ||
337 | m_manual_stop = true; | |
338 | ||
339 | for (auto &pool_replayer : m_pool_replayers) { | |
340 | pool_replayer.second->stop(true); | |
341 | } | |
342 | } | |
343 | ||
344 | void Mirror::restart() | |
345 | { | |
346 | dout(20) << "enter" << dendl; | |
347 | Mutex::Locker l(m_lock); | |
348 | ||
349 | if (m_stopping) { | |
350 | return; | |
351 | } | |
352 | ||
353 | m_manual_stop = false; | |
354 | ||
355 | for (auto &pool_replayer : m_pool_replayers) { | |
356 | pool_replayer.second->restart(); | |
357 | } | |
358 | } | |
359 | ||
360 | void Mirror::flush() | |
361 | { | |
362 | dout(20) << "enter" << dendl; | |
363 | Mutex::Locker l(m_lock); | |
364 | ||
365 | if (m_stopping || m_manual_stop) { | |
366 | return; | |
367 | } | |
368 | ||
369 | for (auto &pool_replayer : m_pool_replayers) { | |
370 | pool_replayer.second->flush(); | |
371 | } | |
372 | } | |
373 | ||
374 | void Mirror::release_leader() | |
375 | { | |
376 | dout(20) << "enter" << dendl; | |
377 | Mutex::Locker l(m_lock); | |
378 | ||
379 | if (m_stopping) { | |
380 | return; | |
381 | } | |
382 | ||
383 | for (auto &pool_replayer : m_pool_replayers) { | |
384 | pool_replayer.second->release_leader(); | |
385 | } | |
386 | } | |
387 | ||
388 | void Mirror::update_pool_replayers(const PoolPeers &pool_peers) | |
389 | { | |
390 | dout(20) << "enter" << dendl; | |
391 | assert(m_lock.is_locked()); | |
392 | ||
393 | // remove stale pool replayers before creating new pool replayers | |
394 | for (auto it = m_pool_replayers.begin(); it != m_pool_replayers.end();) { | |
395 | auto &peer = it->first.second; | |
396 | auto pool_peer_it = pool_peers.find(it->first.first); | |
397 | if (it->second->is_blacklisted()) { | |
398 | derr << "removing blacklisted pool replayer for " << peer << dendl; | |
399 | // TODO: make async | |
400 | it = m_pool_replayers.erase(it); | |
401 | } else if (pool_peer_it == pool_peers.end() || | |
402 | pool_peer_it->second.find(peer) == pool_peer_it->second.end()) { | |
403 | dout(20) << "removing pool replayer for " << peer << dendl; | |
404 | // TODO: make async | |
405 | it = m_pool_replayers.erase(it); | |
406 | } else { | |
407 | ++it; | |
408 | } | |
409 | } | |
410 | ||
411 | for (auto &kv : pool_peers) { | |
412 | for (auto &peer : kv.second) { | |
413 | PoolPeer pool_peer(kv.first, peer); | |
414 | if (m_pool_replayers.find(pool_peer) == m_pool_replayers.end()) { | |
415 | dout(20) << "starting pool replayer for " << peer << dendl; | |
416 | unique_ptr<PoolReplayer> pool_replayer(new PoolReplayer( | |
417 | m_threads, m_image_deleter, m_image_sync_throttler, kv.first, peer, | |
418 | m_args)); | |
419 | ||
420 | // TODO: make async, and retry connecting within pool replayer | |
421 | int r = pool_replayer->init(); | |
422 | if (r < 0) { | |
423 | continue; | |
424 | } | |
425 | m_pool_replayers.emplace(pool_peer, std::move(pool_replayer)); | |
426 | } | |
427 | } | |
428 | ||
429 | // TODO currently only support a single peer | |
430 | } | |
431 | } | |
432 | ||
433 | } // namespace mirror | |
434 | } // namespace rbd |