package irmin

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Contents is the underlying contents store.

Content-addressable stores

Content-addressable stores are store where it is possible to read and add new values. Keys are derived from the values raw contents and hence are deterministic.

type -'a t

The type for content-addressable backend stores. The 'a phantom type carries information about the store mutability.

type key = Val.hash

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 to specify the key directly. The backend might choose to discared that key and/or can be corrupt if the key scheme is not consistent.

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

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

val merge : [> Perms.read_write ] t -> key option Merge.t

merge t lifts the merge functions defined on contents values to contents key. The merge function will: (i) read the values associated with the given keys, (ii) use the merge function defined on values and (iii) write the resulting values into the store to get the resulting key. See Contents.S.merge.

If any of these operations fail, return `Conflict.

module Key : Hash.TYPED with type t = key and type value = value

Key provides base functions for user-defined contents keys.

module Val : sig ... end

Val provides base functions for user-defined contents values.


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