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 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 Irmin_pack.Inode.S with type key = H.t Pack_key.t with type hash = H.t with type Val.metadata = Node.metadata with type Val.step = Node.step with type value = Inter.Val.t
include Irmin.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 : [> 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.

val unsafe_find : check_integrity:bool -> [< Irmin.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 v : config:Irmin.Backend.Conf.t -> fm:file_manager -> dict:dict -> dispatcher:dispatcher -> Irmin.Perms.read t
include Irmin_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 ]) result
val integrity_check_inodes : [ `Read ] t -> key -> (unit, string) 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 : Irmin_pack.Inode.Raw with type t = Pack.value and type hash := hash and type key := hash Pack_key.t
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
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