70 lines
2.7 KiB
OCaml
70 lines
2.7 KiB
OCaml
(* (c) 2017 Hannes Mehnert, all rights reserved *)
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(** A tree data structure including policies and dynamic usage.
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Considering delegation of resources to someone, and further delegation
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to others - using a process which is not controlled by the authority -
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requires runtime tracking of these delegations and the actual usage:
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If Alice may create 2 virtual machines, and she delegates the same
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capability further to both Bob and Charlie, the authority must still enforce
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that Alice, Bob, and Charlie are able to run 2 virtual machines in total,
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rather than 2 each. *)
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open Vmm_core
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(** The type of the resource tree. *)
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type t = private {
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policies : Policy.t Vmm_trie.t ;
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block_devices : (int * bool) Vmm_trie.t ;
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unikernels : Unikernel.t Vmm_trie.t ;
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}
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(** [empty] is the empty tree. *)
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val empty : t
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(** [find_vm t id] is either [Some vm] or [None]. *)
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val find_vm : t -> Name.t -> Unikernel.t option
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(** [find_policy t Name.t] is either [Some policy] or [None]. *)
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val find_policy : t -> Name.t -> Policy.t option
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(** [find_block t Name.t] is either [Some (size, active)] or [None]. *)
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val find_block : t -> Name.t -> (int * bool) option
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(** [check_vm t Name.t vm] checks whether [vm] under [Name.t] in [t] would be
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allowed under the current policies. *)
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val check_vm : t -> Name.t -> Unikernel.config -> (unit, [> `Msg of string ]) result
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(** [insert_vm t Name.t vm] inserts [vm] under [Name.t] in [t], and returns the
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new [t]. The caller has to ensure (using {!check_vm}) that a VM with the
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same name does not yet exist, and the block device is not in use.
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@raise Invalid_argument if block device is already in use, or VM already
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exists. *)
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val insert_vm : t -> Name.t -> Unikernel.t -> t
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(** [insert_policy t Name.t policy] inserts [policy] under [Name.t] in [t], and returns
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the new [t] or an error. *)
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val insert_policy : t -> Name.t -> Policy.t -> (t, [> `Msg of string]) result
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(** [check_block t Name.t size] checks whether [size] under [Name.t] in [t] would be
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allowed under the current policies. *)
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val check_block : t -> Name.t -> int -> (unit, [> `Msg of string ]) result
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(** [insert_block t Name.t size] inserts [size] under [Name.t] in [t], and returns the new [t] or
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an error. *)
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val insert_block : t -> Name.t -> int -> (t, [> `Msg of string]) result
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(** [remove_vm t Name.t] removes vm [Name.t] from [t]. *)
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val remove_vm : t -> Name.t -> (t, [> `Msg of string ]) result
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(** [remove_policy t Name.t] removes policy [Name.t] from [t]. *)
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val remove_policy : t -> Name.t -> (t, [> `Msg of string ]) result
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(** [remove_block t Name.t] removes block [Name.t] from [t]. *)
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val remove_block : t -> Name.t -> (t, [> `Msg of string ]) result
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(** [pp] is a pretty printer for [t]. *)
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val pp : t Fmt.t
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