Make_persistent (octez-libs.Brassaia_pack_unix.Inode.Make

Parameters

module H : Brassaia.Hash.S

module Node : 
  Brassaia.Node.Generic_key.S
    with type hash = H.t
     and type contents_key = H.t Pack_key.t
     and type node_key = H.t Pack_key.t

module Inter : 
  Brassaia_pack.Inode.Internal
    with type hash = H.t
     and type key = H.t Pack_key.t

module Pack : 
  Pack_store.S
    with type hash = H.t
     and type key = H.t Pack_key.t
     and type value = Inter.Raw.t

Signature

include Brassaia_pack.Inode.S
  with type key = H.t Pack_key.t
  with type hash = H.t
  with type value = Inter.Val.t

include Brassaia.Indexable.S
  with type key = H.t Pack_key.t
  with type hash = H.t
  with type value = Inter.Val.t

Read-only stores

Read-only stores are store where it is only possible to read existing values.

type -'a t

The type for stores. The 'a phantom type carries information about the store mutability.

type key = H.t Pack_key.t

The type for keys.

type value = Inter.Val.t

The type for raw values.

val mem : [> Brassaia.Perms.read ] t -> key -> bool Lwt.t

mem t k is true iff k is present in t.

val find : [> Brassaia.Perms.read ] t -> key -> value option Lwt.t

find t k is Some v if k is associated to v in t and None is k is not present in t.

val close : 'a t -> unit Lwt.t

close t frees up all the resources associated with t. Any operations run on a closed handle will raise Closed.

type hash = H.t

The type of hashes of value.

val add : [> Brassaia.Perms.write ] t -> value -> key Lwt.t

Write the contents of a value to the store, and obtain its key.

val unsafe_add : [> Brassaia.Perms.write ] t -> hash -> value -> key Lwt.t

Same as add but allows specifying the value's hash directly. The backend might choose to discard that hash and/or can be corrupt if the hash is not consistent.

val index : [> Brassaia.Perms.read ] t -> hash -> key option Lwt.t

Indexing maps the hash of a value to a corresponding key of that value in the store. For stores that are addressed by hashes directly, this is typically fun _t h -> Lwt.return (Key.of_hash h); for stores with more complex addressing schemes, index may attempt a lookup operation in the store.

In general, indexing is best-effort and reveals no information about the membership of the value in the store. In particular:

index t hash = Some key doesn't guarantee mem t key: the value with hash hash may still be absent from the store;

index t hash = None doesn't guarantee that there is no key such that mem t key and Key.to_hash key = hash: the value may still be present in the store under a key that is not indexed.

val batch : 
  Brassaia.Perms.read t ->
  ([ Brassaia.Perms.read | Brassaia.Perms.write ] t -> 'a Lwt.t) ->
  'a Lwt.t

batch t f applies the writes in f in a separate batch. The exact guarantees depend on the implementation.

module Key : Brassaia.Key.S with type t = key and type hash = hash

module Hash : Brassaia.Hash.S with type t = hash

Signature for digest hashes, inspired by Digestif.

val unsafe_find : 
  check_integrity:bool ->
  [< Brassaia.Perms.read ] t ->
  key ->
  value option

module Val : sig ... end

val decode_bin_length : string -> int -> int

val save : ?allow_non_root:bool -> 'a t -> value -> key

type file_manager = Pack.file_manager

type dict = Pack.dict

type dispatcher = Pack.dispatcher

val init : 
  config:Brassaia.Backend.Conf.t ->
  file_manager:file_manager ->
  dict:dict ->
  dispatcher:dispatcher ->
  lru:Lru.t option ->
  Brassaia.Perms.read t

include Brassaia_pack.Checkable with type 'a t := 'a t and type hash := hash

val integrity_check : 
  offset:Optint.Int63.t ->
  length:int ->
  hash ->
  _ t ->
  (unit, [ `Wrong_hash | `Absent_value ]) Stdlib.result

val integrity_check_inodes : 
  [ `Read ] t ->
  key ->
  (unit, string) Stdlib.result Lwt.t

module Pack : 
  Pack_store.S
    with type file_manager = file_manager
     and type dict = dict
     and type dispatcher = dispatcher
     and type key := hash Pack_key.t
     and type hash := hash
     and type 'a t = 'a t

module Raw : 
  Brassaia_pack.Inode.Raw
    with type t = Pack.value
     and type hash := hash
     and type key := hash Pack_key.t

module Snapshot : Brassaia_pack.Inode.Snapshot with type hash = hash

val to_snapshot : Raw.t -> Snapshot.inode

val of_snapshot : 'a t -> index:(hash -> key) -> Snapshot.inode -> value

val purge_lru : 'a t -> unit

val key_of_offset : 'a t -> Optint.Int63.t -> key

val unsafe_find_no_prefetch : 'a t -> key -> value option

val get_offset : 'a t -> key -> Optint.Int63.t

val get_length : 'a t -> key -> int