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