package xenstore

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Source file quota_interface.ml

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include Namespace.Unsupported

let ( |> ) a b = b a

let read t (perms : Perms.t) (path : Store.Path.t) =
  Perms.has perms Perms.CONFIGURE;
  match Store.Path.to_string_list path with
  | [] -> ""
  | "default" :: [] -> ""
  | "entries-per-domain" :: [] -> ""
  | "number-of-entries" :: [] -> ""
  | "number-of-registered-watches" :: [] -> ""
  | "number-of-active-transactions" :: [] -> ""
  | "number-of-queued-watch-events" :: [] -> ""
  | [ "default"; "number-of-entries" ] -> string_of_int !Quota.maxent
  | [ "default"; "entry-length" ] -> string_of_int !Quota.maxsize
  | [ "default"; "number-of-registered-watches" ] ->
      string_of_int !Quota.maxwatch
  | [ "default"; "number-of-active-transactions" ] ->
      string_of_int !Quota.maxtransaction
  | [ "default"; "number-of-queued-watch-events" ] ->
      string_of_int !Quota.maxwatchevent
  | [ "entries-per-domain"; domid ] ->
      let q = t.Transaction.store.Store.quota in
      let domid = int_of_string domid in
      let n = Quota.get q domid in
      string_of_int n
  | [ "number-of-entries"; domid ] -> (
      match Quota.get_override Quota.maxent_overrides (int_of_string domid) with
      | Some x -> string_of_int x
      | None -> Store.Path.doesnt_exist path)
  | [ "number-of-registered-watches"; domid ] -> (
      match
        Quota.get_override Quota.maxwatch_overrides (int_of_string domid)
      with
      | Some x -> string_of_int x
      | None -> Store.Path.doesnt_exist path)
  | [ "number-of-active-transactions"; domid ] -> (
      match
        Quota.get_override Quota.maxtransaction_overrides (int_of_string domid)
      with
      | Some x -> string_of_int x
      | None -> Store.Path.doesnt_exist path)
  | [ "number-of-queued-watch-events"; domid ] -> (
      match
        Quota.get_override Quota.maxwatchevent_overrides (int_of_string domid)
      with
      | Some x -> string_of_int x
      | None -> Store.Path.doesnt_exist path)
  | _ -> Store.Path.doesnt_exist path

let exists t perms path =
  try
    ignore (read t perms path);
    true
  with Store.Path.Doesnt_exist _ -> false

let write _t _creator perms path value =
  Perms.has perms Perms.CONFIGURE;
  match Store.Path.to_string_list path with
  | [ "default"; "number-of-entries" ] -> Quota.maxent := int_of_string value
  | [ "default"; "entry-length" ] -> Quota.maxsize := int_of_string value
  | [ "default"; "number-of-registered-watches" ] ->
      Quota.maxwatch := int_of_string value
  | [ "default"; "number-of-active-transactions" ] ->
      Quota.maxtransaction := int_of_string value
  | [ "default"; "number-of-queued-watch-events" ] ->
      Quota.maxwatchevent := int_of_string value
  | [ "number-of-entries"; domid ] ->
      Quota.set_override Quota.maxent_overrides (int_of_string domid)
        (Some (int_of_string value))
  | [ "number-of-registered-watches"; domid ] ->
      Quota.set_override Quota.maxwatch_overrides (int_of_string domid)
        (Some (int_of_string value))
  | [ "number-of-active-transactions"; domid ] ->
      Quota.set_override Quota.maxtransaction_overrides (int_of_string domid)
        (Some (int_of_string value))
  | [ "number-of-queued-watch-events"; domid ] ->
      Quota.set_override Quota.maxwatchevent_overrides (int_of_string domid)
        (Some (int_of_string value))
  | _ -> Store.Path.doesnt_exist path

let list t perms path =
  Perms.has perms Perms.CONFIGURE;
  match Store.Path.to_string_list path with
  | [] ->
      [
        "default"
      ; "entries-per-domain"
      ; "number-of-entries"
      ; "number-of-registered-watches"
      ; "number-of-active-transactions"
      ; "number-of-queued-watch-events"
      ]
  | [ "default" ] ->
      [
        "number-of-entries"
      ; "entry-length"
      ; "number-of-registered-watches"
      ; "number-of-active-transactions"
      ; "number-of-queued-watch-events"
      ]
  | [ "entries-per-domain" ] ->
      let q = t.Transaction.store.Store.quota in
      Quota.list q |> List.map fst |> List.map string_of_int
  | [ "number-of-entries" ] ->
      Quota.list_overrides Quota.maxent_overrides
      |> List.map fst |> List.map string_of_int
  | [ "number-of-registered-watches" ] ->
      Quota.list_overrides Quota.maxwatch_overrides
      |> List.map fst |> List.map string_of_int
  | [ "number-of-active-transactions" ] ->
      Quota.list_overrides Quota.maxtransaction_overrides
      |> List.map fst |> List.map string_of_int
  | [ "number-of-queued-watch-events" ] ->
      Quota.list_overrides Quota.maxwatchevent_overrides
      |> List.map fst |> List.map string_of_int
  | _ -> []

let rm _t perms path =
  Perms.has perms Perms.CONFIGURE;
  match Store.Path.to_string_list path with
  | [ "number-of-entries"; domid ] ->
      Quota.set_override Quota.maxent_overrides (int_of_string domid) None
  | [ "number-of-registered-watches"; domid ] ->
      Quota.set_override Quota.maxwatch_overrides (int_of_string domid) None
  | [ "number-of-active-transactions"; domid ] ->
      Quota.set_override Quota.maxtransaction_overrides (int_of_string domid)
        None
  | [ "number-of-queued-watch-events"; domid ] ->
      Quota.set_override Quota.maxwatchevent_overrides (int_of_string domid)
        None
  | _ -> raise Perms.Permission_denied