rrdd_ha_stats.ml

(*
 * Copyright (C) Citrix Systems Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; version 2.1 only. with the special
 * exception on linking described in file LICENSE.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *)

let enabled = ref false

let m = Mutex.create ()

open Threadext

module Statefile_latency = struct
	open Rrd.Statefile_latency
	(* There will be more than one statefile at some point *)
	let all = ref []

	let get_one t =
		Ds.ds_make ~name:(Printf.sprintf "statefile/%s/latency" t.id) ~units:"s"
			~description:"Turn-around time of the latest State-File access from the local host"
			~value:(Opt.default Rrd.VT_Unknown (Opt.map (fun x -> Rrd.VT_Float x) t.latency))
			~ty:Rrd.Gauge ~default:false ()

	let get_all () = List.map get_one !all
end

module Heartbeat_latency = struct
	let raw : float option ref = ref None

	let get () =
		Ds.ds_make ~name:"network/latency" ~units:"s"
			~description:"Interval between the last two heartbeats transmitted from the local host to all Online hosts"
			~value:(Opt.default Rrd.VT_Unknown (Opt.map (fun x -> Rrd.VT_Float x) !raw))
			~ty:Rrd.Gauge ~default:false ()
end

module Xapi_latency = struct
	let raw : float option ref = ref None

	let get () =
		Ds.ds_make ~name:"xapi_healthcheck/latency" ~units:"s"
			~description:"Turn-around time of the latest xapi status monitoring call on the local host"
			~value:(Opt.default Rrd.VT_Unknown (Opt.map (fun x -> Rrd.VT_Float x) !raw))
			~ty:Rrd.Gauge ~default:false ()
end

let all () =
	Mutex.execute m (fun _ ->
		if !enabled then (
			let all =
				Statefile_latency.get_all () @
				[Heartbeat_latency.get (); Xapi_latency.get ()]
			in
			List.map (fun x -> Rrd.Host, x) all
		) else []
	)