ceph/src/mon/MgrMonitor.h

   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 #ifndef CEPH_MGRMONITOR_H
  15 #define CEPH_MGRMONITOR_H
  16
  17 #include "include/Context.h"
  18 #include "MgrMap.h"
  19 #include "PaxosService.h"
  20
  21 class MgrMonitor: public PaxosService
  22 {
  23   MgrMap map;
  24   MgrMap pending_map;
  25
  26   utime_t first_seen_inactive;
  27
  28   std::map<uint64_t, ceph::coarse_mono_clock::time_point> last_beacon;
  29
  30   /**
  31    * If a standby is available, make it active, given that
  32    * there is currently no active daemon.
  33    *
  34    * @return true if a standby was promoted
  35    */
  36   bool promote_standby();
  37   void drop_active();
  38   void drop_standby(uint64_t gid);
  39
  40   Context *digest_event = nullptr;
  41   void cancel_timer();
  42
  43   bool check_caps(MonOpRequestRef op, const uuid_d& fsid);
  44
  45 public:
  46   MgrMonitor(Monitor *mn, Paxos *p, const string& service_name)
  47     : PaxosService(mn, p, service_name)
  48   {}
  49   ~MgrMonitor() override {}
  50
  51   void init() override;
  52   void on_shutdown() override;
  53
  54   const MgrMap &get_map() const { return map; }
  55
  56   bool in_use() const { return map.epoch > 0; }
  57
  58   void create_initial() override;
  59   void update_from_paxos(bool *need_bootstrap) override;
  60   void create_pending() override;
  61   void encode_pending(MonitorDBStore::TransactionRef t) override;
  62
  63   bool preprocess_query(MonOpRequestRef op) override;
  64   bool prepare_update(MonOpRequestRef op) override;
  65
  66   bool preprocess_command(MonOpRequestRef op);
  67   bool prepare_command(MonOpRequestRef op);
  68
  69   void encode_full(MonitorDBStore::TransactionRef t) override { }
  70
  71   bool preprocess_beacon(MonOpRequestRef op);
  72   bool prepare_beacon(MonOpRequestRef op);
  73
  74   void check_sub(Subscription *sub);
  75   void check_subs();
  76   void send_digests();
  77
  78   void on_active() override;
  79   void get_health(list<pair<health_status_t,string> >& summary,
  80                   list<pair<health_status_t,string> > *detail,
  81                   CephContext *cct) const override;
  82   void tick() override;
  83
  84   void print_summary(Formatter *f, std::ostream *ss) const;
  85
  86   friend class C_Updated;
  87 };
  88
  89 #endif