albatross/app/vmm_influxdb_stats.ml

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(* (c) 2018 Hannes Mehnert, all rights reserved *)
open Lwt.Infix
open Astring
open Vmm_core
(*
line protocol:
```
<measurement>[,<tag_key>=<tag_value>[,<tag_key>=<tag_value>]] \
<field_key>=<field_value>[,<field_key>=<field_value>] [<timestamp>]
```
(measurement, tag_key, tag_value, field_key are all strings, index over tags)
* Quoting
Element Double quotes Single quotes
---------------------------------------------
Timestamp Never Never
Measurements, tag keys, tag values, field keys Never* Never*
Field values Double quote string field values. Do not double quote floats,
integers, or Booleans. Never
*=Line Protocol allows users to double and single quote measurement names, tag
keys, tag values, and field keys. It will, however, assume that the double or
single quotes are part of the name, key, or value. This can complicate query
syntax (see the example below).
Float IEEE-754 64-bit floating-point numbers. This is the default numerical
type. Examples: 1, 1.0, 1.e+78, 1.E+78.
Integer Signed 64-bit integers (-9223372036854775808 to 9223372036854775807).
Specify an integer with a trailing i on the number. Example: 1i.
For tag keys, tag values, and field keys always use a backslash character \ to
escape:
commas ,
equal signs =
spaces
For measurements always use a backslash character \ to escape:
commas ,
spaces
For string field values use a backslash character \ to escape:
double quotes ""
Line Protocol does not require users to escape the backslash character \. Users
do not need to escape all other special characters.
do not use any keywords:
ALL ALTER ANY AS ASC BEGIN
BY CREATE CONTINUOUS DATABASE DATABASES DEFAULT
DELETE DESC DESTINATIONS DIAGNOSTICS DISTINCT DROP
DURATION END EVERY EXPLAIN FIELD FOR
FROM GRANT GRANTS GROUP GROUPS IN
INF INSERT INTO KEY KEYS KILL
LIMIT SHOW MEASUREMENT MEASUREMENTS NAME OFFSET
ON ORDER PASSWORD POLICY POLICIES PRIVILEGES
QUERIES QUERY READ REPLICATION RESAMPLE RETENTION
REVOKE SELECT SERIES SET SHARD SHARDS
SLIMIT SOFFSET STATS SUBSCRIPTION SUBSCRIPTIONS TAG
TO USER USERS VALUES WHERE WITH
WRITE
*)
module P = struct
let tv (sec, usec) = Printf.sprintf "%Lu.%06d" sec usec
let i64 i = Printf.sprintf "%Lui" i
let encode_ru vm ru =
let fields =
[ "utime", tv ru.utime ;
"stime", tv ru.stime ;
"maxrss", i64 ru.maxrss ;
"ixrss", i64 ru.ixrss ;
"idrss", i64 ru.idrss ;
"isrss", i64 ru.isrss ;
"minflt", i64 ru.minflt ;
"maxflt", i64 ru.majflt ;
"nswap", i64 ru.nswap ;
"inblock", i64 ru.inblock ;
"outblock", i64 ru.outblock ;
"msgsnd", i64 ru.msgsnd ;
"msgrcv", i64 ru.msgrcv ;
"nsignals", i64 ru.nsignals ;
"nvcsw", i64 ru.nvcsw ;
"nivcsw", i64 ru.nivcsw
]
in
let fields = List.map (fun (k, v) -> k ^ "=" ^ v) fields in
Printf.sprintf "resource_usage,vm=%s %s" vm (String.concat ~sep:"," fields)
let encode_vmm vm xs =
let escape s =
let cutted = String.cuts ~sep:"," s in
let cutted = String.concat ~sep:"\\," cutted in
let cutted = String.cuts ~sep:" " cutted in
let cutted = String.concat ~sep:"\\ " cutted in
let cutted = String.cuts ~sep:"=" cutted in
String.concat ~sep:"\\=" cutted
in
Printf.sprintf "vmm,vm=%s %s" vm
(String.concat ~sep:","
(List.map (fun (k, v) -> (escape k) ^ "=" ^ (i64 v)) xs))
let i32 i = Printf.sprintf "%lui" i
let encode_if vm ifd =
let fields =
(* TODO: flags *)
[ "send_queue_length", i32 ifd.send_length ;
"max_send_queue_length", i32 ifd.max_send_length ;
"send_queue_drops", i32 ifd.send_drops ;
"mtu", i32 ifd.mtu ;
"baudrate", i64 ifd.baudrate ;
"vm_to_host_packets", i64 ifd.input_packets ;
"vm_to_host_errors", i64 ifd.input_errors ;
"vm_to_host_bytes", i64 ifd.input_bytes ;
"vm_to_host_mcast", i64 ifd.input_mcast ;
"vm_to_host_dropped", i64 ifd.input_dropped ;
"collisions", i64 ifd.collisions ;
"host_to_vm_packets", i64 ifd.output_packets ;
"host_to_vm_errors", i64 ifd.output_errors ;
"host_to_vm_bytes", i64 ifd.output_bytes ;
"host_to_vm_mcast", i64 ifd.output_mcast ;
"host_to_vm_dropped", i64 ifd.output_dropped
]
in
let fields = List.map (fun (k, v) -> k ^ "=" ^ v) fields in
Printf.sprintf "interface,vm=%s,ifname=%s %s"
vm ifd.name (String.concat ~sep:"," fields)
end
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let my_version = `AV2
let command = ref 1L
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let str_of_e = function
| `Eof -> "end of file"
| `Exception -> "exception"
| `Toomuch -> "too much"
| `Msg m -> m
(* how many times did I write this now? *)
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let safe_close s =
Lwt.catch
(fun () -> Lwt_unix.close s)
(fun e ->
Logs.err (fun m -> m "exception %s while closing" (Printexc.to_string e)) ;
Lwt.return_unit)
let rec read_sock_write_tcp c ?fd addr addrtype =
match fd with
| None ->
Logs.debug (fun m -> m "new connection to TCP") ;
let fd = Lwt_unix.socket addrtype Lwt_unix.SOCK_STREAM 0 in
Lwt_unix.setsockopt fd Lwt_unix.SO_KEEPALIVE true ;
Lwt.catch
(fun () ->
Lwt_unix.connect fd addr >|= fun () ->
Logs.debug (fun m -> m "connected to TCP") ;
Some fd)
(fun e ->
let addr', port = match addr with
| Lwt_unix.ADDR_INET (ip, port) -> Unix.string_of_inet_addr ip, port
| Lwt_unix.ADDR_UNIX addr -> addr, 0
in
Logs.warn (fun m -> m "error %s connecting to influxd %s:%d, retrying in 5s"
(Printexc.to_string e) addr' port) ;
safe_close fd >>= fun () ->
Lwt_unix.sleep 5.0 >|= fun () ->
None) >>= fun fd ->
read_sock_write_tcp c ?fd addr addrtype
| Some fd ->
Logs.debug (fun m -> m "reading from unix socket") ;
Vmm_lwt.read_wire c >>= function
| Error e ->
Logs.err (fun m -> m "error %s while reading vmm socket (return)"
(str_of_e e)) ;
safe_close fd >>= fun () ->
safe_close c >|= fun () ->
true
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| Ok (hdr, `Command (`Stats_cmd (`Stats_data (ru, vmm, ifs)))) ->
begin
if not (Vmm_asn.version_eq hdr.Vmm_asn.version my_version) then begin
Logs.err (fun m -> m "unknown wire protocol version") ;
safe_close fd >>= fun () ->
safe_close c >|= fun () ->
false
end else
let name = string_of_id hdr.Vmm_asn.id in
let ru = P.encode_ru name ru in
let vmm = match vmm with [] -> [] | _ -> [ P.encode_vmm name vmm ] in
let taps = List.map (P.encode_if name) ifs in
let out = (String.concat ~sep:"\n" (ru :: vmm @ taps)) ^ "\n" in
Logs.debug (fun m -> m "writing %d via tcp" (String.length out)) ;
Vmm_lwt.write_raw fd (Bytes.unsafe_of_string out) >>= function
| Ok () ->
Logs.debug (fun m -> m "wrote successfully") ;
read_sock_write_tcp c ~fd addr addrtype
| Error e ->
Logs.err (fun m -> m "error %s while writing to tcp (%s)"
(str_of_e e) name) ;
safe_close fd >|= fun () ->
false
end
| Ok wire ->
Logs.warn (fun m -> m "ignoring %a" Vmm_asn.pp_wire wire) ;
Lwt.return (Some fd) >>= fun fd ->
read_sock_write_tcp c ?fd addr addrtype
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let query_sock vm c =
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let header = Vmm_asn.{ version = my_version ; sequence = !command ; id = vm } in
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command := Int64.succ !command ;
Logs.debug (fun m -> m "%Lu requesting %a via socket" !command pp_id vm) ;
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Vmm_lwt.write_wire c (header, `Command (`Stats_cmd `Stats_subscribe))
let rec maybe_connect stat_socket =
let c = Lwt_unix.(socket PF_UNIX SOCK_STREAM 0) in
Lwt.catch
(fun () ->
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Logs.debug (fun m -> m "connecting to %s" stat_socket) ;
Lwt_unix.(connect c (ADDR_UNIX stat_socket)) >>= fun () ->
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Logs.debug (fun m -> m "connected") ;
Lwt.return c)
(fun e ->
Logs.warn (fun m -> m "error %s connecting to socket %s"
(Printexc.to_string e) stat_socket) ;
safe_close c >>= fun () ->
Lwt_unix.sleep (float_of_int 5) >>= fun () ->
maybe_connect stat_socket)
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let client stat_socket influxhost influxport vm =
(* figure out address of influx *)
Lwt_unix.gethostbyname influxhost >>= fun host_entry ->
let host_inet_addr = Array.get host_entry.Lwt_unix.h_addr_list 0 in
let addr = Lwt_unix.ADDR_INET (host_inet_addr, influxport)
and addrtype = host_entry.Lwt_unix.h_addrtype
in
(* loop *)
(* the query task queries the stat_socket at each
- if this fails, closing is set to true (and unit is returned)
the read_sock reads the stat_socket, and forwards to a TCP socket
- if closing is true, the TCP socket is closed and unit is returned
- if read on the unix domain socket fails, closing is set to true
(and unit is returned) *)
(* connection to the unix domain socket is managed in this loop only:
- maybe_connect attempts to establishes to it
- query_sock/read_sock_write_tcp write an read from it
- on failure in read or write, the TCP connection is closed, and loop
takes control: safe_close, maybe_connect, rinse, repeat *)
let rec loop () =
(* start a socket connection to vmm_stats *)
maybe_connect stat_socket >>= fun c ->
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query_sock vm c >>= function
| Error e ->
Logs.err (fun m -> m "error %s while writing to stat socket" (str_of_e e)) ;
Lwt.return_unit
| Ok () ->
read_sock_write_tcp c addr addrtype >>= fun restart ->
if restart then loop () else Lwt.return_unit
in
loop ()
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let run_client _ socket (influxhost, influxport) vm =
Sys.(set_signal sigpipe Signal_ignore) ;
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Lwt_main.run (client socket influxhost influxport vm)
let setup_log style_renderer level =
Fmt_tty.setup_std_outputs ?style_renderer ();
Logs.set_level level;
Logs.set_reporter (Logs_fmt.reporter ~dst:Format.std_formatter ())
open Cmdliner
let setup_log =
Term.(const setup_log
$ Fmt_cli.style_renderer ()
$ Logs_cli.level ())
let host_port : (string * int) Arg.converter =
let parse s =
match String.cut ~sep:":" s with
| None -> `Error "broken: no port specified"
| Some (hostname, port) ->
try
`Ok (hostname, int_of_string port)
with
Not_found -> `Error "failed to parse port"
in
parse, fun ppf (h, p) -> Format.fprintf ppf "%s:%d" h p
let socket =
let doc = "Stat socket to connect onto" in
let sock = Vmm_core.socket_path `Stats in
Arg.(value & opt string sock & info [ "s" ; "socket" ] ~doc)
let influx =
Arg.(required & pos 0 (some host_port) None & info [] ~docv:"influx"
~doc:"the influx hostname:port to connect to")
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let vm_c =
let parse s = `Ok (Vmm_core.id_of_string s)
in
(parse, Vmm_core.pp_id)
let opt_vmname =
let doc = "Name virtual machine." in
Arg.(value & opt vm_c [] & info [ "n" ; "name"] ~doc)
let cmd =
let doc = "VMM InfluxDB connector" in
let man = [
`S "DESCRIPTION" ;
`P "$(tname) connects to a vmm stats socket, pulls statistics and pushes them via TCP to influxdb" ]
in
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Term.(pure run_client $ setup_log $ socket $ influx $ opt_vmname),
Term.info "vmm_influxdb_stats" ~version:"%%VERSION_NUM%%" ~doc ~man
let () =
match Term.eval cmd
with `Error _ -> exit 1 | _ -> exit 0