albatross/daemon/albatross_influx.ml

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(* (c) 2018 Hannes Mehnert, all rights reserved *)
open Lwt.Infix
open Astring
open Vmm_core
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open Vmm_core.Stats
(*
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_kinfo_mem vm mem =
let fields =
[ "vsize", i64 mem.vsize ;
"rss", i64 mem.rss ;
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"tsize", i64 mem.tsize ;
"dsize", i64 mem.dsize ;
"ssize", i64 mem.ssize ;
"cow_fauls", string_of_int mem.cow ;
"runtime", i64 mem.runtime ;
"start", tv mem.start ;
]
in
let fields = List.map (fun (k, v) -> k ^ "=" ^ v) fields in
Printf.sprintf "kinfo_mem,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,bridge=%s %s"
vm ifd.bridge (String.concat ~sep:"," fields)
end
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 drop c ?fd addr =
match fd with
| None ->
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begin
Logs.debug (fun m -> m "new connection to TCP") ;
Vmm_lwt.connect Lwt_unix.PF_INET addr >>= function
| None ->
Logs.warn (fun m -> m "error connecting to influxd %a, retrying in 5s"
Vmm_lwt.pp_sockaddr addr);
Lwt_unix.sleep 5.0 >>= fun () ->
read_sock_write_tcp drop c addr
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| Some fd ->
Lwt_unix.setsockopt fd Lwt_unix.SO_KEEPALIVE true ;
read_sock_write_tcp drop c ~fd addr
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end
| 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
| Ok (hdr, `Data (`Stats_data (ru, mem, vmm, ifs))) ->
let name =
let orig = hdr.Vmm_commands.name
and f = if drop then Name.drop_front else (fun a -> a)
in
let n = f orig in
let safe = if Name.is_root n then orig else n in
Name.to_string safe
in
let ru = P.encode_ru name ru in
let mem = match mem with None -> [] | Some m -> [ P.encode_kinfo_mem name m ] in
let vmm = match vmm with None -> [] | Some vmm -> [ P.encode_vmm name vmm ] in
let taps = List.map (P.encode_if name) ifs in
let out = (String.concat ~sep:"\n" (ru :: mem @ vmm @ taps)) ^ "\n" in
Logs.debug (fun m -> m "writing %d via tcp" (String.length out)) ;
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begin
Vmm_lwt.write_raw fd (Bytes.unsafe_of_string out) >>= function
| Ok () ->
Logs.debug (fun m -> m "wrote successfully") ;
read_sock_write_tcp drop c ~fd addr
| Error e ->
Logs.err (fun m -> m "error %s while writing to tcp (%s)"
(str_of_e e) name) ;
safe_close fd >|= fun () ->
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false
end
| Ok wire ->
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Logs.warn (fun m -> m "ignoring %a" Vmm_commands.pp_wire wire) ;
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Lwt.return (Some fd) >>= fun fd ->
read_sock_write_tcp drop c ?fd addr
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let query_sock vm c =
let header = Vmm_commands.header ~sequence:!command vm in
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command := Int64.succ !command ;
Logs.debug (fun m -> m "%Lu requesting %a via socket" !command Name.pp vm) ;
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Vmm_lwt.write_wire c (header, `Command (`Stats_cmd `Stats_subscribe))
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let rec maybe_connect () =
let sockaddr = Lwt_unix.ADDR_UNIX (socket_path `Stats) in
Logs.debug (fun m -> m "connecting to %a" Vmm_lwt.pp_sockaddr sockaddr);
Vmm_lwt.connect Lwt_unix.PF_UNIX sockaddr >>= function
| None ->
Logs.warn (fun m -> m "error connecting to socket %a" Vmm_lwt.pp_sockaddr sockaddr);
Lwt_unix.sleep 5. >>= fun () ->
maybe_connect ()
| Some c ->
Logs.debug (fun m -> m "connected");
Lwt.return c
let client influx vm drop =
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match influx with
| None -> Lwt.return (Error (`Msg "influx host not provided"))
| Some (ip, port) ->
let addr = Lwt_unix.ADDR_INET (Ipaddr_unix.V4.to_inet_addr ip, port) 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) *)
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(* 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 *)
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maybe_connect () >>= fun c ->
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query_sock vm c >>= function
| Error e ->
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let err =
Rresult.R.error_msgf "error %s while writing to stat socket" (str_of_e e)
in
Lwt.return err
| Ok () ->
read_sock_write_tcp drop c addr >>= fun restart ->
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if restart then loop () else Lwt.return (Ok ())
in
loop ()
let run_client _ influx vm drop =
Sys.(set_signal sigpipe Signal_ignore) ;
Lwt_main.run (client influx vm drop)
open Cmdliner
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open Albatross_cli
let drop_label =
let doc = "Drop leftmost label" in
Arg.(value & flag & info [ "drop-label" ] ~doc)
let cmd =
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let doc = "Albatross Influx connector" in
let man = [
`S "DESCRIPTION" ;
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`P "$(tname) connects to a albatross stats socket, pulls statistics and pushes them via TCP to influxdb" ]
in
Term.(term_result (const run_client $ setup_log $ influx $ opt_vm_name $ drop_label)),
Term.info "albatross_influx" ~version ~doc ~man
let () =
match Term.eval cmd
with `Error _ -> exit 1 | _ -> exit 0