vmmd: revise process, write_reply, and out signatures, move process to jump
This commit is contained in:
Hannes Mehnert
parent
d4e31da27f
commit
d84013103c
105
app/vmmd.ml
105
app/vmmd.ml
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@ -37,20 +37,20 @@ let create process cont =
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let state', out' = Vmm_vmmd.handle_shutdown !state name vm r in
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state := state' ;
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s := { !s with vm_destroyed = succ !s.vm_destroyed } ;
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(process "handle shutdown" out' >|= fun _ -> ()) >|= fun () ->
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process "handle shutdown (stat, log)" out' >|= fun () ->
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let state', waiter_opt = Vmm_vmmd.waiter !state name in
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state := state' ;
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(match waiter_opt with
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| None -> ()
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| Some wakeme -> Lwt.wakeup wakeme ())) ;
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(process "setting up statistics, log, reply" out >|= fun _ -> ())
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process "setting up stat, log, reply" out
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let register who header =
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match Vmm_vmmd.register !state who Lwt.task with
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| None -> Error (`Data (header, `Failure "task already registered"))
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| Some (state', task) -> state := state' ; Ok task
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let handle out fd addr =
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let handle process fd addr =
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Logs.debug (fun m -> m "connection from %a" Vmm_lwt.pp_sockaddr addr) ;
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(* now we need to read a packet and handle it
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(1)
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@ -64,21 +64,6 @@ let handle out fd addr =
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-- Lwt effects happen (stats, logs, wait_and_clear) --
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(2) goto (1)
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*)
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let process txt wires =
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Lwt_list.fold_left_s (fun r data ->
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match r, data with
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| Ok (), (#Vmm_vmmd.service_out as o) -> out o
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| Ok (), `Data wire ->
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(* rather: terminate connection *)
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Vmm_lwt.write_wire fd wire >|= fun _ ->
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Ok ()
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| Error e, _ -> Lwt.return (Error e))
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(Ok ()) wires >|= function
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| Ok () -> Ok ()
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| Error (`Msg msg) ->
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Logs.err (fun m -> m "error in processing data %s: %s" txt msg) ;
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Error ()
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in
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let rec loop () =
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Logs.debug (fun m -> m "now reading") ;
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Vmm_lwt.read_wire fd >>= function
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@ -86,32 +71,31 @@ let handle out fd addr =
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Logs.err (fun m -> m "error while reading") ;
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Lwt.return_unit
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| Ok wire ->
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Logs.debug (fun m -> m "read sth") ;
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Logs.debug (fun m -> m "read %a" Vmm_commands.pp_wire wire) ;
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let state', data, next = Vmm_vmmd.handle_command !state wire in
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state := state' ;
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process "handle_command" data >>= function
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| Error () -> Lwt.return_unit
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| Ok () -> match next with
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process "handle command" data >>= fun () ->
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match next with
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| `Loop -> loop ()
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| `End -> Lwt.return_unit
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| `Create cont -> create process cont
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| `Wait (who, out) ->
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(match register who (fst wire) with
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| Error out' -> process "wait" [ out' ] >|= ignore
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| Error out' -> process "wait" [ out' ]
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| Ok task ->
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task >>= fun () ->
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process "wait" [ out ] >|= ignore)
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process "wait" [ out ])
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| `Wait_and_create (who, next) ->
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(match register who (fst wire) with
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| Error out' -> process "wait and create" [ out' ] >|= ignore
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| Error out' -> process "wait and create" [ out' ]
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| Ok task ->
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task >>= fun () ->
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let state', data, n = next !state in
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state := state' ;
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process "wait and create" data >>= fun _ ->
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process "wait and create" data >>= fun () ->
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match n with
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| `End -> Lwt.return_unit
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| `Create cont -> create process cont >|= ignore)
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| `Create cont -> create process cont)
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in
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loop () >>= fun () ->
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Vmm_lwt.safe_close fd
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@ -185,39 +169,70 @@ let jump _ =
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| Some c -> c) >>= fun (c, c_fd, c_mut) ->
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create_mbox `Stats >>= fun s ->
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let write_reply (header, cmd) name mvar fd mut =
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let write_reply txt (header, cmd) name mvar fd mut =
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Lwt_mutex.with_lock mut (fun () ->
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Lwt_mvar.put mvar (header, cmd) >>= fun () ->
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Vmm_lwt.read_wire fd) >|= function
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| Ok (header', reply) ->
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if not Vmm_commands.(version_eq header.version header'.version) then
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Error (`Msg ("wrong version in reply from " ^ name))
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else if not Vmm_commands.(Int64.equal header.sequence header'.sequence) then
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Error (`Msg (
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Fmt.strf "wrong id %Lu (expected %Lu) in reply from %s"
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header'.Vmm_commands.sequence header.Vmm_commands.sequence name))
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else begin match reply with
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| `Success _ -> Ok ()
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| `Failure msg -> Error (`Msg (msg ^ " from " ^ name))
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| _ -> Error (`Msg ("unexpected data from " ^ name))
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if not Vmm_commands.(version_eq header.version header'.version) then begin
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Logs.err (fun m -> m "%s: wrong version (got %a, expected %a) in reply from %s"
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txt
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Vmm_commands.pp_version header'.Vmm_commands.version
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Vmm_commands.pp_version header.Vmm_commands.version
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name) ;
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invalid_arg "bad version received"
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end else if not Vmm_commands.(Int64.equal header.sequence header'.sequence) then begin
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Logs.err (fun m -> m "%s: wrong id %Lu (expected %Lu) in reply from %s"
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txt header'.Vmm_commands.sequence header.Vmm_commands.sequence name) ;
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invalid_arg "wrong sequence number received"
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end else begin
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Logs.debug (fun m -> m "%s: received valid reply from %s %a"
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txt name Vmm_commands.pp_wire (header', reply)) ;
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match reply with
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| `Success _ -> ()
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| `Failure msg ->
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(* can we programatically solve such a situation? *)
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(* we at least know e.g when writing to console resulted in an error,
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that we can't continue but need to roll back -- and not continue
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with execvp() *)
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Logs.err (fun m -> m "%s: received failure %s from %s" txt msg name)
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| _ ->
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Logs.err (fun m -> m "%s: unexpected data from %s" txt name) ;
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invalid_arg "unexpected data"
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end
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| Error _ -> Error (`Msg ("error in read from " ^ name))
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| Error _ ->
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Logs.err (fun m -> m "error in read from %s" name) ;
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invalid_arg "communication failure"
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in
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let out = function
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let out txt = function
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| `Stat wire ->
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begin match s with
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| None -> Lwt.return (Ok ())
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| Some (s, s_fd, s_mut) -> write_reply wire "stats" s s_fd s_mut
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| None -> Lwt.return_unit
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| Some (s, s_fd, s_mut) -> write_reply txt wire "stats" s s_fd s_mut
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end
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| `Log wire -> write_reply wire "log" l l_fd l_mut
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| `Cons wire -> write_reply wire "console" c c_fd c_mut
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| `Log wire -> write_reply txt wire "log" l l_fd l_mut
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| `Cons wire -> write_reply txt wire "console" c c_fd c_mut
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in
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let process ?fd txt wires =
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Lwt_list.iter_p (function
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| (#Vmm_vmmd.service_out as o) -> out txt o
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| `Data wire -> match fd with
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| None ->
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Logs.app (fun m -> m "%s received %a" txt Vmm_commands.pp_wire wire) ;
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Lwt.return_unit
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| Some fd ->
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(* TODO should we terminate the connection on write failure? *)
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Vmm_lwt.write_wire fd wire >|= fun _ ->
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())
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wires
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in
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Lwt.async stats_loop ;
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Lwt.catch (fun () ->
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let rec loop () =
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Lwt_unix.accept ss >>= fun (fd, addr) ->
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Lwt_unix.set_close_on_exec fd ;
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Lwt.async (fun () -> handle out fd addr) ;
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Lwt.async (fun () -> handle (process ~fd) fd addr) ;
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loop ()
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in
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loop ())
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