preserve backwards data compatibility
This commit is contained in:
Hannes Mehnert
parent
5b187999f1
commit
47fef438e0
187
src/vmm_asn.ml
187
src/vmm_asn.ml
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@ -104,6 +104,8 @@ let ru =
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@ (required ~label:"nvcsw" int64)
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-@ (required ~label:"nivcsw" int64))
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(* although this changed (+runtime + cow + start) from V3 to V4, since it's not
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persistent, no need to care about it *)
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let kinfo_mem =
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let open Stats in
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let f (vsize, (rss, (tsize, (dsize, (ssize, (runtime, (cow, start))))))) =
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@ -187,42 +189,53 @@ let of_name, to_name =
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| Ok name -> name
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let log_event =
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(* this is stored on disk persistently -- be aware when changing the grammar
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below to only ever extend it! *)
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let f = function
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| `C1 () -> `Startup
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| `C2 (name, ip, port) -> `Login (to_name name, ip, port)
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| `C3 (name, ip, port) -> `Logout (to_name name, ip, port)
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| `C4 (name, pid, taps, blocks) ->
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| `C1 `C1 () -> `Startup
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| `C1 `C2 (name, ip, port) -> `Login (to_name name, ip, port)
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| `C1 `C3 (name, ip, port) -> `Logout (to_name name, ip, port)
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| `C1 `C4 (name, pid, taps, block) ->
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let name = to_name name in
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let blocks = match block with
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| None -> []
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| Some block -> [ block, Name.block_name name block ]
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and taps = List.map (fun tap -> tap, tap) taps
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in
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`Unikernel_start (name, pid, taps, blocks)
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| `C2 `C1 (name, pid, taps, blocks) ->
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let blocks = List.map (fun (name, dev) ->
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name, match Name.of_string dev with
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| Error `Msg msg -> Asn.S.error (`Parse msg)
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| Ok id -> id) blocks
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in
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`Unikernel_start (to_name name, pid, taps, blocks)
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| `C5 (name, pid, status) ->
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| `C1 `C5 (name, pid, status) ->
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let status' = match status with
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| `C1 n -> `Exit n
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| `C2 n -> `Signal n
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| `C3 n -> `Stop n
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in
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`Unikernel_stop (to_name name, pid, status')
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| `C6 () -> `Hup
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| `C1 `C6 () -> `Hup
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| `C2 `C2 () -> assert false (* placeholder *)
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and g = function
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| `Startup -> `C1 ()
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| `Login (name, ip, port) -> `C2 (of_name name, ip, port)
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| `Logout (name, ip, port) -> `C3 (of_name name, ip, port)
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| `Startup -> `C1 (`C1 ())
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| `Login (name, ip, port) -> `C1 (`C2 (of_name name, ip, port))
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| `Logout (name, ip, port) -> `C1 (`C3 (of_name name, ip, port))
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| `Unikernel_start (name, pid, taps, blocks) ->
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let blocks =
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List.map (fun (name, dev) -> name, Name.to_string dev) blocks
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in
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`C4 (of_name name, pid, taps, blocks)
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`C2 (`C1 (of_name name, pid, taps, blocks))
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| `Unikernel_stop (name, pid, status) ->
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let status' = match status with
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| `Exit n -> `C1 n
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| `Signal n -> `C2 n
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| `Stop n -> `C3 n
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in
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`C5 (of_name name, pid, status')
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| `Hup -> `C6 ()
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`C1 (`C5 (of_name name, pid, status'))
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| `Hup -> `C1 (`C6 ())
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in
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let endp =
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Asn.S.(sequence3
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@ -231,31 +244,42 @@ let log_event =
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(required ~label:"port" int))
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in
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Asn.S.map f g @@
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Asn.S.(choice6
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(explicit 0 null)
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(explicit 1 endp)
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(explicit 2 endp)
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(explicit 3 (sequence4
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(required ~label:"name" (sequence_of utf8_string))
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(required ~label:"pid" int)
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(required ~label:"taps"
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(sequence_of
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(sequence2
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(required ~label:"bridge" utf8_string)
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(required ~label:"tap" utf8_string))))
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(required ~label:"blocks"
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(sequence_of
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(sequence2
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(required ~label:"name" utf8_string)
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(required ~label:"device" utf8_string))))))
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(explicit 4 (sequence3
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(required ~label:"name" (sequence_of utf8_string))
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(required ~label:"pid" int)
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(required ~label:"status" (choice3
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(explicit 0 int)
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(explicit 1 int)
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(explicit 2 int)))))
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(explicit 5 null))
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Asn.S.(choice2
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(choice6
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(explicit 0 null)
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(explicit 1 endp)
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(explicit 2 endp)
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(* the old V3 unikernel start *)
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(explicit 3 (sequence4
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(required ~label:"name" (sequence_of utf8_string))
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(required ~label:"pid" int)
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(required ~label:"taps" (sequence_of utf8_string))
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(optional ~label:"block" utf8_string)))
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(explicit 4 (sequence3
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(required ~label:"name" (sequence_of utf8_string))
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(required ~label:"pid" int)
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(required ~label:"status" (choice3
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(explicit 0 int)
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(explicit 1 int)
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(explicit 2 int)))))
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(explicit 5 null))
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(choice2
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(* the new V4 unikernel start*)
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(explicit 6 (sequence4
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(required ~label:"name" (sequence_of utf8_string))
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(required ~label:"pid" int)
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(required ~label:"taps"
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(sequence_of
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(sequence2
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(required ~label:"bridge" utf8_string)
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(required ~label:"tap" utf8_string))))
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(required ~label:"blocks"
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(sequence_of
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(sequence2
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(required ~label:"name" utf8_string)
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(required ~label:"device" utf8_string))))))
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(explicit 7 null)))
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let log_cmd =
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let f = function
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@ -299,6 +323,55 @@ let fail_behaviour =
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(explicit 0 null)
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(explicit 1 (set_of int)))
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(* this is part of the state file! *)
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let v3_unikernel_config =
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let image =
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let f = function
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| `C1 x -> `Hvt_amd64, x
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| `C2 x -> `Hvt_arm64, x
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| `C3 x -> `Hvt_amd64_compressed, x
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and g = function
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| `Hvt_amd64, x -> `C1 x
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| `Hvt_arm64, x -> `C2 x
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| `Hvt_amd64_compressed, x -> `C3 x
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in
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Asn.S.map f g @@
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Asn.S.(choice3
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(explicit 0 octet_string)
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(explicit 1 octet_string)
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(explicit 2 octet_string))
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in
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let open Unikernel in
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let f (cpuid, memory, block_device, network_interfaces, image, argv) =
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let bridges = match network_interfaces with None -> [] | Some xs -> xs
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and block_devices = match block_device with None -> [] | Some b -> [ b ]
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in
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let typ = `Solo5
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and compressed = match fst image with `Hvt_amd64_compressed -> true | _ -> false
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and image = snd image
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and fail_behaviour = `Quit
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in
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{ typ ; compressed ; image ; fail_behaviour ; cpuid ; memory ; block_devices ; bridges ; argv }
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and g vm =
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let network_interfaces = match vm.bridges with [] -> None | xs -> Some xs
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and block_device = match vm.block_devices with [] -> None | x::_ -> Some x
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and typ = if vm.compressed then `Hvt_amd64_compressed else `Hvt_amd64
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in
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let image = typ, vm.image in
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(vm.cpuid, vm.memory, block_device, network_interfaces, image, vm.argv)
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in
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Asn.S.map f g @@
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Asn.S.(sequence6
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(required ~label:"cpu" int)
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(required ~label:"memory" int)
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(optional ~label:"block" utf8_string)
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(optional ~label:"network_interfaces" (sequence_of utf8_string))
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(required ~label:"image" image)
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(optional ~label:"arguments" (sequence_of utf8_string)))
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(* this is part of the state file (and unikernel_create command)
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be aware if this (or a dependent grammar) is changed! *)
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let unikernel_config =
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let open Unikernel in
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let f (typ, (compressed, (image, (fail_behaviour, (cpuid, (memory, (blocks, (bridges, argv)))))))) =
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@ -507,28 +580,6 @@ let wire =
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let wire_of_cstruct, wire_to_cstruct = projections_of wire
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(* maybe one day to smoothly transition to a new version,
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but this requires version handshaking in all communication (i.e. server
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sends: supported versions, client picks one to talk over this channel)
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let payload_of_cstruct, _ = projections_of payload
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let wire_of_cstruct versions buf =
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let wire_header =
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Asn.S.(sequence2
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(required ~label:"header" header)
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(required ~label:"payload" octet_string))
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in
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let wire_header_of_cstruct, _ = projections_of wire_header in
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match wire_header_of_cstruct buf with
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| Error e -> Error e
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| Ok (header, payload) ->
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if List.mem header.version versions then
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match payload_of_cstruct payload with
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| Ok p -> Ok (header, p)
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| Error e -> Error e
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else
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Error (`Msg "unsupported version")
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*)
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let log_entry =
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Asn.S.(sequence2
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(required ~label:"timestamp" utc_time)
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@ -536,12 +587,8 @@ let log_entry =
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let log_entry_of_cstruct, log_entry_to_cstruct = projections_of log_entry
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(* if we revise structure, we need to stay in a sequence.. the first element
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is always the version, we can dispatch on it for the later reader
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-- would be easier to use a choice here -- we can define implicit tagged
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is the current structure, and then 1 for new format etc.
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keep in mind while changing arbitrary data here which may end up in the log ;)
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*)
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(* data is persisted to disk, we need to ensure to be able to decode (and
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encode) properly without conflicts! *)
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let log_disk =
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Asn.S.(sequence2
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(required ~label:"version" version)
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@ -584,20 +631,22 @@ let trie e =
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(required ~label:"name" utf8_string)
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(required ~label:"value" e)))
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let version0_unikernels = trie unikernel_config
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let version0_unikernels = trie v3_unikernel_config
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let version1_unikernels = trie unikernel_config
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let unikernels =
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(* the choice is the implicit version + migration... be aware when
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any dependent data layout changes .oO(/o\) *)
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let f = function
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| `C1 () -> Asn.S.error (`Parse "shouldn't happen")
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| `C1 data -> data
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| `C2 data -> data
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and g data =
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`C2 data
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`C1 data
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in
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Asn.S.map f g @@
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Asn.S.(choice2
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(explicit 0 null)
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(explicit 0 version1_unikernels)
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(explicit 1 version0_unikernels))
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let unikernels_of_cstruct, unikernels_to_cstruct = projections_of unikernels
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