package irmin-pack

  1. Overview
  2. Docs
package irmin-pack
Legend:
Library
Module
Module type
Parameter
Class
Class type

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 Snapshot.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 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) Stdlib.result Lwt.t
val save : ?allow_non_root:bool -> 'a t -> value -> key
OCaml

Innovation. Community. Security.

GitHub Discord Twitter Peertube RSS
About
Changelog Releases Industrial Users Academic Users Why OCaml
Ecosystem
Packages Community Events OCaml Planet Jobs
Resources
Install OCaml Get Started Platform Tools Language Manual Standard Library API Books Exercises Papers OCaml Playground Logo
Policies
Carbon Footprint Governance Privacy Code of Conduct