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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