Irmin, a distributed database that follows the same design principles as Git
Parameter #2 Irmin . Node . Store . S

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 = C.key

The type for keys.

type value

The type for raw values.

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

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

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

Write the contents of a value to the store. It's the responsibility of the content-addressable store to generate a consistent key.

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

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

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.

val batch : t -> ( [ | 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.