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diff --git a/src/mgr/MgrClient.h b/src/mgr/MgrClient.h
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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 MGR_CLIENT_H_
+#define MGR_CLIENT_H_
+
+#include "msg/Connection.h"
+#include "msg/Dispatcher.h"
+#include "mon/MgrMap.h"
+#include "mgr/DaemonHealthMetric.h"
+
+#include "messages/MMgrReport.h"
+#include "mgr/OSDPerfMetricTypes.h"
+
+#include "common/perf_counters.h"
+#include "common/Timer.h"
+#include "common/CommandTable.h"
+
+class MMgrMap;
+class MMgrConfigure;
+class MMgrClose;
+class Messenger;
+class MCommandReply;
+class MPGStats;
+
+class MgrSessionState
+{
+  public:
+  // Which performance counters have we already transmitted schema for?
+  std::set<std::string> declared;
+
+  // Our connection to the mgr
+  ConnectionRef con;
+};
+
+class MgrCommand : public CommandOp
+{
+  public:
+
+  explicit MgrCommand(ceph_tid_t t) : CommandOp(t) {}
+  MgrCommand() : CommandOp() {}
+};
+
+class MgrClient : public Dispatcher
+{
+protected:
+  CephContext *cct;
+  MgrMap map;
+  Messenger *msgr;
+
+  unique_ptr<MgrSessionState> session;
+
+  Mutex lock = {"MgrClient::lock"};
+  Cond shutdown_cond;
+
+  uint32_t stats_period = 0;
+  uint32_t stats_threshold = 0;
+  SafeTimer timer;
+
+  CommandTable<MgrCommand> command_table;
+
+  utime_t last_connect_attempt;
+
+  uint64_t last_config_bl_version = 0;
+
+  Context *report_callback = nullptr;
+  Context *connect_retry_callback = nullptr;
+
+  // If provided, use this to compose an MPGStats to send with
+  // our reports (hook for use by OSD)
+  std::function<MPGStats*()> pgstats_cb;
+  std::function<void(const std::map<OSDPerfMetricQuery,
+                                    OSDPerfMetricLimits> &)> set_perf_queries_cb;
+  std::function<void(std::map<OSDPerfMetricQuery,
+                              OSDPerfMetricReport> *)> get_perf_report_cb;
+
+  // for service registration and beacon
+  bool service_daemon = false;
+  bool daemon_dirty_status = false;
+  bool task_dirty_status = false;
+  std::string service_name, daemon_name;
+  std::map<std::string,std::string> daemon_metadata;
+  std::map<std::string,std::string> daemon_status;
+  std::map<std::string,std::string> task_status;
+  std::vector<DaemonHealthMetric> daemon_health_metrics;
+
+  void reconnect();
+  void _send_open();
+
+  // In pre-luminous clusters, the ceph-mgr service is absent or optional,
+  // so we must not block in start_command waiting for it.
+  bool mgr_optional = false;
+
+public:
+  MgrClient(CephContext *cct_, Messenger *msgr_);
+
+  void set_messenger(Messenger *msgr_) { msgr = msgr_; }
+
+  void init();
+  void shutdown();
+
+  void set_mgr_optional(bool optional_) {mgr_optional = optional_;}
+
+  bool ms_dispatch(Message *m) override;
+  bool ms_handle_reset(Connection *con) override;
+  void ms_handle_remote_reset(Connection *con) override {}
+  bool ms_handle_refused(Connection *con) override;
+
+  bool handle_mgr_map(MMgrMap *m);
+  bool handle_mgr_configure(MMgrConfigure *m);
+  bool handle_mgr_close(MMgrClose *m);
+  bool handle_command_reply(MCommandReply *m);
+
+  void set_perf_metric_query_cb(
+    std::function<void(const std::map<OSDPerfMetricQuery,
+                                      OSDPerfMetricLimits> &)> cb_set,
+          std::function<void(std::map<OSDPerfMetricQuery,
+                                      OSDPerfMetricReport> *)> cb_get)
+  {
+      std::lock_guard l(lock);
+      set_perf_queries_cb = cb_set;
+      get_perf_report_cb = cb_get;
+  }
+
+  void send_pgstats();
+  void set_pgstats_cb(std::function<MPGStats*()>&& cb_)
+  {
+    std::lock_guard l(lock);
+    pgstats_cb = std::move(cb_);
+  }
+
+  int start_command(const vector<string>& cmd, const bufferlist& inbl,
+		    bufferlist *outbl, string *outs,
+		    Context *onfinish);
+
+  int service_daemon_register(
+    const std::string& service,
+    const std::string& name,
+    const std::map<std::string,std::string>& metadata);
+  int service_daemon_update_status(
+    std::map<std::string,std::string>&& status);
+  int service_daemon_update_task_status(
+    std::map<std::string,std::string> &&task_status);
+  void update_daemon_health(std::vector<DaemonHealthMetric>&& metrics);
+
+  bool is_initialized() const { return initialized; }
+
+private:
+  void _send_stats();
+  void _send_pgstats();
+  void _send_report();
+
+  bool initialized = false;
+};
+
+#endif