Web interface for builder
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open Lwt.Infix
let safe_close fd =
Lwt.catch
(fun () -> Lwt_unix.close fd)
(fun _ -> Lwt.return_unit)
let connect addrtype sockaddr =
let c = Lwt_unix.(socket addrtype SOCK_STREAM 0) in
Lwt_unix.set_close_on_exec c ;
Lwt.catch (fun () ->
Lwt_unix.(connect c sockaddr) >|= fun () ->
Some c)
(fun e ->
Logs.warn (fun m -> m "error %s connecting to influx"
(Printexc.to_string e));
safe_close c >|= fun () ->
None)
let write_raw s buf =
let rec w off l =
Lwt.catch (fun () ->
Lwt_unix.send s buf off l [] >>= fun n ->
if n = l then
Lwt.return (Ok ())
else
w (off + n) (l - n))
(fun e ->
Logs.err (fun m -> m "exception %s while writing" (Printexc.to_string e)) ;
safe_close s >|= fun () ->
Error `Exception)
in
(* Logs.debug (fun m -> m "writing %a" Cstruct.hexdump_pp (Cstruct.of_bytes buf)) ; *)
w 0 (Bytes.length buf)
let process =
Metrics.field ~doc:"name of the process" "vm" Metrics.String
let init_influx name data =
match data with
| None -> ()
| Some (ip, port) ->
Logs.info (fun m -> m "stats connecting to %a:%d" Ipaddr.V4.pp ip port);
Metrics.enable_all ();
Metrics_lwt.init_periodic (fun () -> Lwt_unix.sleep 10.);
Metrics_lwt.periodically (Metrics_rusage.rusage_src ~tags:[]);
Metrics_lwt.periodically (Metrics_rusage.kinfo_mem_src ~tags:[]);
let get_cache, reporter = Metrics.cache_reporter () in
Metrics.set_reporter reporter;
let fd = ref None in
let rec report () =
let send () =
(match !fd with
| Some _ -> Lwt.return_unit
| None ->
let addr = Lwt_unix.ADDR_INET (Ipaddr_unix.V4.to_inet_addr ip, port) in
connect Lwt_unix.PF_INET addr >|= function
| None -> Logs.err (fun m -> m "connection failure to stats")
| Some fd' -> fd := Some fd') >>= fun () ->
match !fd with
| None -> Lwt.return_unit
| Some socket ->
let tag = process name in
let datas = Metrics.SM.fold (fun src (tags, data) acc ->
let name = Metrics.Src.name src in
Metrics_influx.encode_line_protocol (tag :: tags) data name :: acc)
(get_cache ()) []
in
let datas = String.concat "" datas in
write_raw socket (Bytes.unsafe_of_string datas) >|= function
| Ok () -> ()
| Error `Exception ->
Logs.warn (fun m -> m "error on stats write");
fd := None
and sleep () = Lwt_unix.sleep 10.
in
Lwt.join [ send () ; sleep () ] >>= report
in
Lwt.async report
let setup_app level influx port host datadir cachedir configdir =
let dbpath = Printf.sprintf "%s/builder.sqlite3" datadir in
let datadir = Fpath.v datadir in
let cachedir =
cachedir |> Option.fold ~none:Fpath.(datadir / "_cache") ~some:Fpath.v
in
let configdir = Fpath.v configdir in
let () = init_influx "builder-web" influx in
match Builder_web.init dbpath datadir with
| Error (#Caqti_error.load as e) ->
Format.eprintf "Error: %a\n%!" Caqti_error.pp e;
exit 2
| Error (
#Caqti_error.connect
| #Caqti_error.call_or_retrieve
| `Msg _
| `Wrong_version _ as e
) ->
Format.eprintf "Error: %a\n%!" Builder_web.pp_error e;
exit 1
| Ok () ->
let level = match level with
| None -> None
| Some Logs.Debug -> Some `Debug
| Some Info -> Some `Info
| Some Warning -> Some `Warning
| Some Error -> Some `Error
| Some App -> None
in
Dream.initialize_log ?level ();
Dream.run ~port ~interface:host ~https:false
@@ Dream.logger
@@ Dream.sql_pool ("sqlite3:" ^ dbpath)
@@ Http_status_metrics.handle
@@ Builder_web.add_routes ~datadir ~cachedir ~configdir
@@ Builder_web.not_found
open Cmdliner
let ip_port : (Ipaddr.V4.t * int) Arg.conv =
let default_port = 8094 in
let parse s =
match
match String.split_on_char ':' s with
| [ s ] -> Ok (s, default_port)
| [ip; port] -> begin match int_of_string port with
| exception Failure _ -> Error "non-numeric port"
| port -> Ok (ip, port)
end
| _ -> Error "multiple : found"
with
| Error msg -> Error (`Msg msg)
| Ok (ip, port) -> match Ipaddr.V4.of_string ip with
| Ok ip -> Ok (ip, port)
| Error `Msg msg -> Error (`Msg msg)
in
let printer ppf (ip, port) =
Format.fprintf ppf "%a:%d" Ipaddr.V4.pp ip port in
Arg.conv (parse, printer)
let datadir =
let doc = "data directory" in
Arg.(value & opt dir Builder_system.default_datadir & info [ "d"; "datadir" ] ~doc)
let cachedir =
let doc = "cache directory" in
Arg.(
value
& opt (some ~none:"DATADIR/_cache" dir) None
& info [ "cachedir" ] ~doc
)
let configdir =
let doc = "config directory" in
Arg.(value & opt dir Builder_system.default_configdir & info [ "c"; "configdir" ] ~doc)
let port =
let doc = "port" in
Arg.(value & opt int 3000 & info [ "p"; "port" ] ~doc)
let host =
let doc = "host" in
Arg.(value & opt string "0.0.0.0" & info [ "h"; "host" ] ~doc)
let influx =
let doc = "IP address and port (default: 8094) to report metrics to in influx line protocol" in
Arg.(value & opt (some ip_port) None & info [ "influx" ] ~doc ~docv:"INFLUXHOST[:PORT]")
let () =
let term =
Term.(const setup_app $ Logs_cli.level () $ influx $ port $ host $ datadir $
cachedir $ configdir)
in
let info = Cmd.info "Builder web" ~doc:"Builder web" ~man:[] in
Cmd.v info term
|> Cmd.eval
|> exit