ceph/src/mgr/MgrClient.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2016 John Spray <john.spray@redhat.com>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  */
  13
  14
  15 #include "MgrClient.h"
  16
  17 #include "mgr/MgrContext.h"
  18
  19 #include "msg/Messenger.h"
  20 #include "messages/MMgrMap.h"
  21 #include "messages/MMgrReport.h"
  22 #include "messages/MMgrOpen.h"
  23 #include "messages/MMgrConfigure.h"
  24 #include "messages/MCommand.h"
  25 #include "messages/MCommandReply.h"
  26 #include "messages/MPGStats.h"
  27
  28 #define dout_subsys ceph_subsys_mgrc
  29 #undef dout_prefix
  30 #define dout_prefix *_dout << "mgrc " << __func__ << " "
  31
  32 MgrClient::MgrClient(CephContext *cct_, Messenger *msgr_)
  33     : Dispatcher(cct_), cct(cct_), msgr(msgr_),
  34       timer(cct_, lock)
  35 {
  36   assert(cct != nullptr);
  37 }
  38
  39 void MgrClient::init()
  40 {
  41   Mutex::Locker l(lock);
  42
  43   assert(msgr != nullptr);
  44
  45   timer.init();
  46 }
  47
  48 void MgrClient::shutdown()
  49 {
  50   Mutex::Locker l(lock);
  51
  52   if (connect_retry_callback) {
  53     timer.cancel_event(connect_retry_callback);
  54     connect_retry_callback = nullptr;
  55   }
  56
  57   // forget about in-flight commands if we are prematurely shut down
  58   // (e.g., by control-C)
  59   command_table.clear();
  60
  61   timer.shutdown();
  62   if (session) {
  63     session->con->mark_down();
  64     session.reset();
  65   }
  66 }
  67
  68 bool MgrClient::ms_dispatch(Message *m)
  69 {
  70   Mutex::Locker l(lock);
  71
  72   switch(m->get_type()) {
  73   case MSG_MGR_MAP:
  74     return handle_mgr_map(static_cast<MMgrMap*>(m));
  75   case MSG_MGR_CONFIGURE:
  76     return handle_mgr_configure(static_cast<MMgrConfigure*>(m));
  77   case MSG_COMMAND_REPLY:
  78     if (m->get_source().type() == CEPH_ENTITY_TYPE_MGR) {
  79       handle_command_reply(static_cast<MCommandReply*>(m));
  80       return true;
  81     } else {
  82       return false;
  83     }
  84   default:
  85     ldout(cct, 30) << "Not handling " << *m << dendl;
  86     return false;
  87   }
  88 }
  89
  90 void MgrClient::reconnect()
  91 {
  92   assert(lock.is_locked_by_me());
  93
  94   if (session) {
  95     ldout(cct, 4) << "Terminating session with "
  96                   << session->con->get_peer_addr() << dendl;
  97     session->con->mark_down();
  98     session.reset();
  99     stats_period = 0;
 100     if (report_callback != nullptr) {
 101       timer.cancel_event(report_callback);
 102       report_callback = nullptr;
 103     }
 104   }
 105
 106   if (!map.get_available()) {
 107     ldout(cct, 4) << "No active mgr available yet" << dendl;
 108     return;
 109   }
 110
 111   if (last_connect_attempt != utime_t()) {
 112     utime_t now = ceph_clock_now();
 113     utime_t when = last_connect_attempt;
 114     when += cct->_conf->get_val<double>("mgr_connect_retry_interval");
 115     if (now < when) {
 116       if (!connect_retry_callback) {
 117         connect_retry_callback = timer.add_event_at(
 118           when,
 119           new FunctionContext([this](int r){
 120               connect_retry_callback = nullptr;
 121               reconnect();
 122             }));
 123       }
 124       ldout(cct, 4) << "waiting to retry connect until " << when << dendl;
 125       return;
 126     }
 127   }
 128
 129   if (connect_retry_callback) {
 130     timer.cancel_event(connect_retry_callback);
 131     connect_retry_callback = nullptr;
 132   }
 133
 134   ldout(cct, 4) << "Starting new session with " << map.get_active_addr()
 135                 << dendl;
 136   entity_inst_t inst;
 137   inst.addr = map.get_active_addr();
 138   inst.name = entity_name_t::MGR(map.get_active_gid());
 139   last_connect_attempt = ceph_clock_now();
 140
 141   session.reset(new MgrSessionState());
 142   session->con = msgr->get_connection(inst);
 143
 144   if (service_daemon) {
 145     daemon_dirty_status = true;
 146   }
 147
 148   // Don't send an open if we're just a client (i.e. doing
 149   // command-sending, not stats etc)
 150   if (!cct->_conf->name.is_client() || service_daemon) {
 151     _send_open();
 152   }
 153
 154   // resend any pending commands
 155   for (const auto &p : command_table.get_commands()) {
 156     MCommand *m = p.second.get_message({});
 157     assert(session);
 158     assert(session->con);
 159     session->con->send_message(m);
 160   }
 161 }
 162
 163 void MgrClient::_send_open()
 164 {
 165   if (session && session->con) {
 166     auto open = new MMgrOpen();
 167     if (!service_name.empty()) {
 168       open->service_name = service_name;
 169       open->daemon_name = daemon_name;
 170     } else {
 171       open->daemon_name = cct->_conf->name.get_id();
 172     }
 173     if (service_daemon) {
 174       open->service_daemon = service_daemon;
 175       open->daemon_metadata = daemon_metadata;
 176     }
 177     session->con->send_message(open);
 178   }
 179 }
 180
 181 bool MgrClient::handle_mgr_map(MMgrMap *m)
 182 {
 183   assert(lock.is_locked_by_me());
 184
 185   ldout(cct, 20) << *m << dendl;
 186
 187   map = m->get_map();
 188   ldout(cct, 4) << "Got map version " << map.epoch << dendl;
 189   m->put();
 190
 191   ldout(cct, 4) << "Active mgr is now " << map.get_active_addr() << dendl;
 192
 193   // Reset session?
 194   if (!session ||
 195       session->con->get_peer_addr() != map.get_active_addr()) {
 196     reconnect();
 197   }
 198
 199   return true;
 200 }
 201
 202 bool MgrClient::ms_handle_reset(Connection *con)
 203 {
 204   Mutex::Locker l(lock);
 205   if (session && con == session->con) {
 206     ldout(cct, 4) << __func__ << " con " << con << dendl;
 207     reconnect();
 208     return true;
 209   }
 210   return false;
 211 }
 212
 213 bool MgrClient::ms_handle_refused(Connection *con)
 214 {
 215   // do nothing for now
 216   return false;
 217 }
 218
 219 void MgrClient::send_report()
 220 {
 221   assert(lock.is_locked_by_me());
 222   assert(session);
 223   report_callback = nullptr;
 224
 225   auto report = new MMgrReport();
 226   auto pcc = cct->get_perfcounters_collection();
 227
 228   pcc->with_counters([this, report](
 229         const PerfCountersCollection::CounterMap &by_path)
 230   {
 231     // Helper for checking whether a counter should be included
 232     auto include_counter = [this](
 233         const PerfCounters::perf_counter_data_any_d &ctr,
 234         const PerfCounters &perf_counters)
 235     {
 236       return perf_counters.get_adjusted_priority(ctr.prio) >= (int)stats_threshold;
 237     };
 238
 239     // Helper for cases where we want to forget a counter
 240     auto undeclare = [report, this](const std::string &path)
 241     {
 242       report->undeclare_types.push_back(path);
 243       ldout(cct,20) << " undeclare " << path << dendl;
 244       session->declared.erase(path);
 245     };
 246
 247     ENCODE_START(1, 1, report->packed);
 248
 249     // Find counters that no longer exist, and undeclare them
 250     for (auto p = session->declared.begin(); p != session->declared.end(); ) {
 251       const auto &path = *(p++);
 252       if (by_path.count(path) == 0) {
 253         undeclare(path);
 254       }
 255     }
 256
 257     for (const auto &i : by_path) {
 258       auto& path = i.first;
 259       auto& data = *(i.second.data);
 260       auto& perf_counters = *(i.second.perf_counters);
 261
 262       // Find counters that still exist, but are no longer permitted by
 263       // stats_threshold
 264       if (!include_counter(data, perf_counters)) {
 265         if (session->declared.count(path)) {
 266           undeclare(path);
 267         }
 268         continue;
 269       }
 270
 271       if (session->declared.count(path) == 0) {
 272         ldout(cct,20) << " declare " << path << dendl;
 273         PerfCounterType type;
 274         type.path = path;
 275         if (data.description) {
 276           type.description = data.description;
 277         }
 278         if (data.nick) {
 279           type.nick = data.nick;
 280         }
 281         type.type = data.type;
 282         type.priority = perf_counters.get_adjusted_priority(data.prio);
 283         report->declare_types.push_back(std::move(type));
 284         session->declared.insert(path);
 285       }
 286
 287       ::encode(static_cast<uint64_t>(data.u64), report->packed);
 288       if (data.type & PERFCOUNTER_LONGRUNAVG) {
 289         ::encode(static_cast<uint64_t>(data.avgcount), report->packed);
 290         ::encode(static_cast<uint64_t>(data.avgcount2), report->packed);
 291       }
 292     }
 293     ENCODE_FINISH(report->packed);
 294
 295     ldout(cct, 20) << "sending " << session->declared.size() << " counters ("
 296                       "of possible " << by_path.size() << "), "
 297                    << report->declare_types.size() << " new, "
 298                    << report->undeclare_types.size() << " removed"
 299                    << dendl;
 300   });
 301
 302   ldout(cct, 20) << "encoded " << report->packed.length() << " bytes" << dendl;
 303
 304   if (daemon_name.size()) {
 305     report->daemon_name = daemon_name;
 306   } else {
 307     report->daemon_name = cct->_conf->name.get_id();
 308   }
 309   report->service_name = service_name;
 310
 311   if (daemon_dirty_status) {
 312     report->daemon_status = daemon_status;
 313     daemon_dirty_status = false;
 314   }
 315
 316   session->con->send_message(report);
 317
 318   if (stats_period != 0) {
 319     report_callback = new FunctionContext([this](int r){send_report();});
 320     timer.add_event_after(stats_period, report_callback);
 321   }
 322
 323   send_pgstats();
 324 }
 325
 326 void MgrClient::send_pgstats()
 327 {
 328   if (pgstats_cb && session) {
 329     session->con->send_message(pgstats_cb());
 330   }
 331 }
 332
 333 bool MgrClient::handle_mgr_configure(MMgrConfigure *m)
 334 {
 335   assert(lock.is_locked_by_me());
 336
 337   ldout(cct, 20) << *m << dendl;
 338
 339   if (!session) {
 340     lderr(cct) << "dropping unexpected configure message" << dendl;
 341     m->put();
 342     return true;
 343   }
 344
 345   ldout(cct, 4) << "stats_period=" << m->stats_period << dendl;
 346
 347   if (stats_threshold != m->stats_threshold) {
 348     ldout(cct, 4) << "updated stats threshold: " << m->stats_threshold << dendl;
 349     stats_threshold = m->stats_threshold;
 350   }
 351
 352   bool starting = (stats_period == 0) && (m->stats_period != 0);
 353   stats_period = m->stats_period;
 354   if (starting) {
 355     send_report();
 356   }
 357
 358   m->put();
 359   return true;
 360 }
 361
 362 int MgrClient::start_command(const vector<string>& cmd, const bufferlist& inbl,
 363                   bufferlist *outbl, string *outs,
 364                   Context *onfinish)
 365 {
 366   Mutex::Locker l(lock);
 367
 368   ldout(cct, 20) << "cmd: " << cmd << dendl;
 369
 370   if (map.epoch == 0) {
 371     ldout(cct,20) << " no MgrMap, assuming EACCES" << dendl;
 372     return -EACCES;
 373   }
 374
 375   auto &op = command_table.start_command();
 376   op.cmd = cmd;
 377   op.inbl = inbl;
 378   op.outbl = outbl;
 379   op.outs = outs;
 380   op.on_finish = onfinish;
 381
 382   if (session && session->con) {
 383     // Leaving fsid argument null because it isn't used.
 384     MCommand *m = op.get_message({});
 385     session->con->send_message(m);
 386   }
 387   return 0;
 388 }
 389
 390 bool MgrClient::handle_command_reply(MCommandReply *m)
 391 {
 392   assert(lock.is_locked_by_me());
 393
 394   ldout(cct, 20) << *m << dendl;
 395
 396   const auto tid = m->get_tid();
 397   if (!command_table.exists(tid)) {
 398     ldout(cct, 4) << "handle_command_reply tid " << m->get_tid()
 399             << " not found" << dendl;
 400     m->put();
 401     return true;
 402   }
 403
 404   auto &op = command_table.get_command(tid);
 405   if (op.outbl) {
 406     op.outbl->claim(m->get_data());
 407   }
 408
 409   if (op.outs) {
 410     *(op.outs) = m->rs;
 411   }
 412
 413   if (op.on_finish) {
 414     op.on_finish->complete(m->r);
 415   }
 416
 417   command_table.erase(tid);
 418
 419   m->put();
 420   return true;
 421 }
 422
 423 int MgrClient::service_daemon_register(
 424   const std::string& service,
 425   const std::string& name,
 426   const std::map<std::string,std::string>& metadata)
 427 {
 428   Mutex::Locker l(lock);
 429   if (name == "osd" ||
 430       name == "mds" ||
 431       name == "client" ||
 432       name == "mon" ||
 433       name == "mgr") {
 434     // normal ceph entity types are not allowed!
 435     return -EINVAL;
 436   }
 437   if (service_daemon) {
 438     return -EEXIST;
 439   }
 440   ldout(cct,1) << service << "." << name << " metadata " << metadata << dendl;
 441   service_daemon = true;
 442   service_name = service;
 443   daemon_name = name;
 444   daemon_metadata = metadata;
 445   daemon_dirty_status = true;
 446
 447   // late register?
 448   if (cct->_conf->name.is_client() && session && session->con) {
 449     _send_open();
 450   }
 451
 452   return 0;
 453 }
 454
 455 int MgrClient::service_daemon_update_status(
 456   const std::map<std::string,std::string>& status)
 457 {
 458   Mutex::Locker l(lock);
 459   ldout(cct,10) << status << dendl;
 460   daemon_status = status;
 461   daemon_dirty_status = true;
 462   return 0;
 463 }