package irmin-pack

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package irmin-pack
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Parameters

module H : Irmin.Hash.S
module Key : Irmin.Key.S with type hash = H.t
module Node : Irmin.Node.Generic_key.S with type hash = H.t and type contents_key = Key.t and type node_key = Key.t
module Inter : Internal with type hash = H.t and type key = Key.t and type Val.metadata = Node.metadata and type Val.step = Node.step
module Pack : Indexable.S with type key = Key.t and type hash = H.t and type value = Inter.Raw.t

Signature

include Irmin.Indexable.S with type 'a t = 'a Pack.t with type key = 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 = 'a Pack.t

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

type key = Key.t

The type for keys.

type value = Inter.Val.t

The type for raw values.

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

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

val find : [> Irmin.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 : [> Irmin.Perms.write ] t -> value -> key Lwt.t

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

val unsafe_add : [> Irmin.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 : [> Irmin.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 clear : 'a t -> unit Lwt.t

Clear the store. This operation is expected to be slow.

val batch : Irmin.Perms.read t -> ([ Irmin.Perms.read | Irmin.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 : Irmin.Key.S with type t = key and type hash = hash
module Hash : Irmin.Hash.S with type t = hash

Signature for digest hashes, inspired by Digestif.

module Val : sig ... end
val decode_bin_length : string -> int -> int
val integrity_check_inodes : [ `Read ] t -> key -> (unit, string) result Lwt.t
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