albatross/app/vmmd.ml

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(* (c) 2017 Hannes Mehnert, all rights reserved *)
open Vmm_cli
type stats = {
start : Ptime.t ;
vm_created : int ;
vm_destroyed : int ;
}
let s = ref { start = Ptime_clock.now () ; vm_created = 0 ; vm_destroyed = 0 }
let pp_stats ppf s =
let diff = Ptime.(diff (Ptime_clock.now ()) s.start) in
Fmt.pf ppf "up %a: %d vms created, %d vms destroyed, %d running"
Ptime.Span.pp diff
s.vm_created s.vm_destroyed (s.vm_created - s.vm_destroyed)
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open Lwt.Infix
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let version = `AV2
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let state = ref (Vmm_vmmd.init version)
let create process cont =
let await, wakeme = Lwt.wait () in
match cont !state await with
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| Error (`Msg msg) ->
Logs.err (fun m -> m "create continuation failed %s" msg) ;
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Lwt.return_unit
| Ok (state'', out, name, vm) ->
state := state'' ;
s := { !s with vm_created = succ !s.vm_created } ;
Lwt.async (fun () ->
Vmm_lwt.wait_and_clear vm.Vmm_core.pid vm.Vmm_core.stdout >>= fun r ->
let state', out' = Vmm_vmmd.handle_shutdown !state name vm r in
s := { !s with vm_destroyed = succ !s.vm_destroyed } ;
state := state' ;
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(process "handle_shutdown" out' >|= fun _ -> ()) >|= fun () ->
Lwt.wakeup wakeme ()) ;
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(process "setting up console" out >|= fun _ -> ()) >>= fun () ->
let state', out = Vmm_vmmd.setup_stats !state name vm in
state := state' ;
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process "setting up statistics" [ out ] >|= fun _ -> ()
let handle out fd addr =
Logs.debug (fun m -> m "connection from %a" Vmm_lwt.pp_sockaddr addr) ;
(* now we need to read a packet and handle it
(1)
(a) easy for info (look up name/prefix in resources)
(b) destroy looks up vm in resources, executes kill (wait for pid will do the cleanup)
logs "destroy issued"
(c) create initiates the vm startup procedure:
write image file, create fifo, create tap(s), send fifo to console
-- Lwt effects happen (console) --
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executes solo5-hvt + waiter, send stats pid and taps, inserts await into state, logs "created vm"
-- Lwt effects happen (stats, logs, wait_and_clear) --
(2) goto (1)
*)
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let process txt wires =
Lwt_list.fold_left_s (fun r data ->
match r, data with
| Ok (), (#Vmm_vmmd.service_out as o) -> out o
| Ok (), `Data wire ->
(* rather: terminate connection *)
Vmm_lwt.write_wire fd wire >|= fun _ ->
Ok ()
| Error e, _ -> Lwt.return (Error e))
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(Ok ()) wires >|= function
| Ok () -> Ok ()
| Error (`Msg msg) ->
Logs.err (fun m -> m "error in process %s: %s" txt msg) ;
Error ()
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in
let rec loop () =
Logs.debug (fun m -> m "now reading") ;
Vmm_lwt.read_wire fd >>= function
| Error _ ->
Logs.err (fun m -> m "error while reading") ;
Lwt.return_unit
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| Ok wire ->
Logs.debug (fun m -> m "read sth") ;
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let state', data, next = Vmm_vmmd.handle_command !state wire in
state := state' ;
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process "handle_command" data >>= function
| Error () -> Lwt.return_unit
| Ok () -> match next with
| `Loop -> loop ()
| `End -> Lwt.return_unit
| `Create cont -> create process cont
| `Wait (task, out) ->
task >>= fun () ->
process "wait" [ out ] >|= ignore
| `Wait_and_create (task, next) ->
task >>= fun () ->
let state', data, n = next !state in
state := state' ;
process "wait and create" data >>= fun _ ->
match n with
| `End -> Lwt.return_unit
| `Create cont -> create process cont >|= ignore
in
loop () >>= fun () ->
Vmm_lwt.safe_close fd
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let init_sock sock =
let name = Vmm_core.socket_path sock in
let c = Lwt_unix.(socket PF_UNIX SOCK_STREAM 0) in
Lwt_unix.set_close_on_exec c ;
Lwt.catch (fun () ->
Lwt_unix.(connect c (ADDR_UNIX name)) >|= fun () -> Some c)
(fun e ->
Logs.warn (fun m -> m "error %s connecting to socket %s"
(Printexc.to_string e) name) ;
(Lwt.catch (fun () -> Lwt_unix.close c) (fun _ -> Lwt.return_unit)) >|= fun () ->
None)
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let create_mbox sock =
init_sock sock >|= function
| None -> None
| Some fd ->
let mvar = Lwt_mvar.create_empty () in
(* could be more elaborate:
if <log> fails, we can reconnect and spit our more log messages to the new socket
if <console> fails, all running VMs terminate, so we can terminate as well ;)
if <stat> fails, we'd need to retransmit all VM info to stat (or stat has to ask at connect) *)
let rec loop () =
Lwt_mvar.take mvar >>= fun data ->
Vmm_lwt.write_wire fd data >>= function
| Ok () -> loop ()
| Error `Exception -> invalid_arg ("exception while writing to " ^ Fmt.to_to_string Vmm_core.pp_socket sock) ;
in
Lwt.async loop ;
Some (mvar, fd)
let server_socket sock =
let name = Vmm_core.socket_path sock in
(Lwt_unix.file_exists name >>= function
| true -> Lwt_unix.unlink name
| false -> Lwt.return_unit) >>= fun () ->
let s = Lwt_unix.(socket PF_UNIX SOCK_STREAM 0) in
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Lwt_unix.set_close_on_exec s ;
Lwt_unix.(bind s (ADDR_UNIX name)) >|= fun () ->
Lwt_unix.listen s 1 ;
s
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let rec stats_loop () =
Logs.info (fun m -> m "%a" pp_stats !s) ;
Lwt_unix.sleep 600. >>= fun () ->
stats_loop ()
let jump _ =
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Sys.(set_signal sigpipe Signal_ignore) ;
Lwt_main.run
(server_socket `Vmmd >>= fun ss ->
(create_mbox `Console >|= function
| None -> invalid_arg "cannot connect to console socket"
| Some c -> c) >>= fun (c, c_fd) ->
create_mbox `Stats >>= fun s ->
(create_mbox `Log >|= function
| None -> invalid_arg "cannot connect to log socket"
| Some l -> l) >>= fun (l, l_fd) ->
let write_reply (header, cmd) mvar fd =
Lwt_mvar.put mvar (header, cmd) >>= fun () ->
Vmm_lwt.read_wire fd >|= function
| Ok (header', reply) ->
if not Vmm_commands.(version_eq header.version header'.version) then
Error (`Msg "wrong version in reply")
else if not Vmm_commands.(Int64.equal header.sequence header'.sequence) then
Error (`Msg "wrong id in reply")
else begin match reply with
| `Success _ -> Ok ()
| `Failure msg -> Error (`Msg msg)
| _ -> Error (`Msg "unexpected data")
end
| Error _ -> Error (`Msg "error in read")
in
let out = function
| `Stat wire ->
begin match s with
| None -> Lwt.return (Ok ())
| Some (s, s_fd) -> write_reply wire s s_fd
end
| `Log wire -> write_reply wire l l_fd
| `Cons wire -> write_reply wire c c_fd
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in
Lwt.async stats_loop ;
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let rec loop () =
Lwt_unix.accept ss >>= fun (fd, addr) ->
Lwt_unix.set_close_on_exec fd ;
Lwt.async (fun () -> handle out fd addr) ;
loop ()
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in
loop ())
open Cmdliner
let cmd =
Term.(ret (const jump $ setup_log)),
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Term.info "vmmd" ~version:"%%VERSION_NUM%%"
let () = match Term.eval cmd with `Ok () -> exit 0 | _ -> exit 1