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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2016 John Spray <john.spray@redhat.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*/
#ifndef CEPH_MGRMONITOR_H
#define CEPH_MGRMONITOR_H
#include <map>
#include <set>
#include "include/Context.h"
#include "MgrMap.h"
#include "PaxosService.h"
#include "MonCommand.h"
class MgrMonitor: public PaxosService
{
MgrMap map;
MgrMap pending_map;
bool ever_had_active_mgr = false;
std::map<std::string, ceph::buffer::list> pending_metadata;
std::set<std::string> pending_metadata_rm;
std::map<std::string,Option> mgr_module_options;
std::list<std::string> misc_option_strings;
utime_t first_seen_inactive;
std::map<uint64_t, ceph::coarse_mono_clock::time_point> last_beacon;
/**
* If a standby is available, make it active, given that
* there is currently no active daemon.
*
* @return true if a standby was promoted
*/
bool promote_standby();
/**
* Drop the active daemon from the MgrMap. No promotion is performed.
*
* @return whether PAXOS was plugged by this method
*/
bool drop_active();
/**
* Remove this gid from the list of standbys. By default,
* also remove metadata (i.e. forget the daemon entirely).
*
* Set `drop_meta` to false if you would like to keep
* the daemon's metadata, for example if you're dropping
* it as a standby before reinstating it as the active daemon.
*/
void drop_standby(uint64_t gid, bool drop_meta=true);
Context *digest_event = nullptr;
void cancel_timer();
std::vector<health_check_map_t> prev_health_checks;
bool check_caps(MonOpRequestRef op, const uuid_d& fsid);
health_status_t should_warn_about_mgr_down();
// Command descriptions we've learned from the active mgr
std::vector<MonCommand> command_descs;
std::vector<MonCommand> pending_command_descs;
public:
MgrMonitor(Monitor &mn, Paxos &p, const std::string& service_name)
: PaxosService(mn, p, service_name)
{}
~MgrMonitor() override {}
void init() override;
void on_shutdown() override;
const MgrMap &get_map() const { return map; }
const std::map<std::string,Option>& get_mgr_module_options() {
return mgr_module_options;
}
const Option *find_module_option(const std::string& name);
bool in_use() const { return map.epoch > 0; }
version_t get_trim_to() const override;
void prime_mgr_client();
void create_initial() override;
void get_store_prefixes(std::set<std::string>& s) const override;
void update_from_paxos(bool *need_bootstrap) override;
void post_paxos_update() override;
void create_pending() override;
void encode_pending(MonitorDBStore::TransactionRef t) override;
bool preprocess_query(MonOpRequestRef op) override;
bool prepare_update(MonOpRequestRef op) override;
bool preprocess_command(MonOpRequestRef op);
bool prepare_command(MonOpRequestRef op);
void encode_full(MonitorDBStore::TransactionRef t) override { }
bool preprocess_beacon(MonOpRequestRef op);
bool prepare_beacon(MonOpRequestRef op);
void check_sub(Subscription *sub);
void check_subs();
void send_digests();
void on_active() override;
void on_restart() override;
void tick() override;
void print_summary(ceph::Formatter *f, std::ostream *ss) const;
const std::vector<MonCommand> &get_command_descs() const;
int load_metadata(const std::string& name, std::map<std::string, std::string>& m,
std::ostream *err) const;
int dump_metadata(const std::string& name, ceph::Formatter *f, std::ostream *err);
void print_nodes(ceph::Formatter *f) const;
void count_metadata(const std::string& field, ceph::Formatter *f);
void count_metadata(const std::string& field, std::map<std::string,int> *out);
void get_versions(std::map<std::string, std::list<std::string>> &versions);
// When did the mon last call into our tick() method? Used for detecting
// when the mon was not updating us for some period (e.g. during slow
// election) to reset last_beacon timeouts
ceph::coarse_mono_clock::time_point last_tick;
};
#endif
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