package tezos-protocol-012-Psithaca

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The generic signature of indexed data accessors (a set of values of the same type indexed by keys of the same form in the hierarchical (key x value) database).

include Non_iterable_indexed_data_storage
type t
type context = t
type key

An abstract type for keys

type value

The type of values

val mem : context -> key -> bool Lwt.t

Tells if a given key is already bound to a storage bucket

val get : context -> key -> (value, Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.error Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.trace) result Lwt.t

Retrieve a value from the storage bucket at a given key ; returns Storage_errorMissing_key if the key is not set ; returns Storage_errorCorrupted_data if the deserialisation fails.

val find : context -> key -> (value option, Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.error Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.trace) result Lwt.t

Retrieve a value from the storage bucket at a given key ; returns None if the value is not set ; returns Storage_error Corrupted_data if the deserialisation fails.

val update : context -> key -> value -> (Raw_context.t, Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.error Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.trace) result Lwt.t

Updates the content of a bucket ; returns A Storage_Error Missing_key if the value does not exists.

val init : context -> key -> value -> (Raw_context.t, Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.error Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.trace) result Lwt.t

Allocates a storage bucket at the given key and initializes it ; returns a Storage_errorExisting_key if the bucket exists.

val add : context -> key -> value -> Raw_context.t Lwt.t

Allocates a storage bucket at the given key and initializes it with a value ; just updates it if the bucket exists.

val add_or_remove : context -> key -> value option -> Raw_context.t Lwt.t

When the value is Some v, allocates the data and initializes it with v ; just updates it if the bucket exists. When the value is None, delete the storage bucket when the value ; does nothing if the bucket does not exists.

val remove_existing : context -> key -> (Raw_context.t, Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.error Tezos_protocol_environment_012_Psithaca__Environment.Error_monad.trace) result Lwt.t

Delete a storage bucket and its contents ; returns a Storage_errorMissing_key if the bucket does not exists.

val remove : context -> key -> Raw_context.t Lwt.t

Removes a storage bucket and its contents ; does nothing if the bucket does not exists.

val clear : context -> Raw_context.t Lwt.t

Empties all the keys and associated data.

val keys : context -> key list Lwt.t

Lists all the keys.

val bindings : context -> (key * value) list Lwt.t

Lists all the keys and associated data.

val fold : context -> order:[ `Sorted | `Undefined ] -> init:'a -> f:(key -> value -> 'a -> 'a Lwt.t) -> 'a Lwt.t

Iterates over all the keys and associated data.

val fold_keys : context -> order:[ `Sorted | `Undefined ] -> init:'a -> f:(key -> 'a -> 'a Lwt.t) -> 'a Lwt.t

Iterate over all the keys.

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