package tezos-protocol-012-Psithaca

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include Raw_context_intf.VIEW with type key := Raw_context.key with type value := Raw_context.value with type tree := Raw_context.tree
type t

The type for context handler.

Getters

mem t k is an Lwt promise that resolves to true iff k is bound to a value in t.

mem_tree t k is like mem but for trees.

get t k is an Lwt promise that resolves to Ok v if k is bound to the value v in t and Storage_ErrorMissing_key otherwise.

find t k is an Lwt promise that resolves to Some v if k is bound to the value v in t and None otherwise.

find_tree t k is like find but for trees.

val list : t -> ?offset:int -> ?length:int -> Raw_context.key -> (string * Raw_context.tree) list Tezos_protocol_environment_012_Psithaca.Lwt.t

list t key is the list of files and sub-nodes stored under k in t. The result order is not specified but is stable.

offset and length are used for pagination.

Setters

init t k v is an Lwt promise that resolves to Ok c if:

  • k is unbound in t;
  • k is bound to v in c;
  • and c is similar to t otherwise.

It is Storage_errorExisting_key if k is already bound in t.

update t k v is an Lwt promise that resolves to Ok c if:

  • k is bound in t;
  • k is bound to v in c;
  • and c is similar to t otherwise.

It is Storage_errorMissing_key if k is not already bound in t.

add t k v is an Lwt promise that resolves to c such that:

  • k is bound to v in c;
  • and c is similar to t otherwise.

If k was already bound in t to a value that is physically equal to v, the result of the function is a promise that resolves to t. Otherwise, the previous binding of k in t disappears.

add_tree is like add but for trees.

remove t k v is an Lwt promise that resolves to c such that:

  • k is unbound in c;
  • and c is similar to t otherwise.

remove_existing t k v is an Lwt promise that resolves to Ok c if:

  • k is bound in t to a value;
  • k is unbound in c;
  • and c is similar to t otherwise.

remove_existing_tree t k v is an Lwt promise that reolves to Ok c if:

  • k is bound in t to a tree;
  • k is unbound in c;
  • and c is similar to t otherwise.

add_or_remove t k v is:

  • add t k x if v is Some x;
  • remove t k otherwise.

add_or_remove_tree t k v is:

  • add_tree t k x if v is Some x;
  • remove t k otherwise.

Folds

val fold : ?depth:[ `Eq of int | `Le of int | `Lt of int | `Ge of int | `Gt of int ] -> t -> Raw_context.key -> order:[ `Sorted | `Undefined ] -> init:'a -> f: (Raw_context.key -> Raw_context.tree -> 'a -> 'a Tezos_protocol_environment_012_Psithaca.Lwt.t) -> 'a Tezos_protocol_environment_012_Psithaca.Lwt.t

fold ?depth t root ~init ~f recursively folds over the trees and values of t. The f callbacks are called with a key relative to root. f is never called with an empty key for values; i.e., folding over a value is a no-op.

Elements are traversed in lexical order of keys.

The depth is 0-indexed. If depth is set (by default it is not), then f is only called when the conditions described by the parameter is true:

  • Eq d folds over nodes and contents of depth exactly d.
  • Lt d folds over nodes and contents of depth strictly less than d.
  • Le d folds over nodes and contents of depth less than or equal to d.
  • Gt d folds over nodes and contents of depth strictly more than d.
  • Ge d folds over nodes and contents of depth more than or equal to d.
module Tree : Raw_context_intf.TREE with type t := t and type key := Raw_context.key and type value := Raw_context.value and type tree := Raw_context.tree

Tree provides immutable, in-memory partial mirror of the context, with lazy reads and delayed writes. The trees are Merkle trees that carry the same hash as the part of the context they mirror.

val project : t -> Raw_context.root

Internally used in Storage_functors to escape from a view.

val absolute_key : t -> Raw_context.key -> Raw_context.key

Internally used in Storage_functors to retrieve a full key from partial key relative a view.

Raised if block gas quota is exhausted during gas consumption.

Raised if operation gas quota is exhausted during gas consumption.

Internally used in Storage_functors to consume gas from within a view. May raise Block_quota_exceeded or Operation_quota_exceeded.

Check if consume_gas will fail

val description : t Storage_description.t
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