Module sp_io::storage

Interface for accessing the storage from within the runtime.

Structs

HostFunctions

Provides implementations for the extern host functions.

Functions

changes_root	"Commit" all existing operations and get the resulting storage change root. parent_hash is a SCALE encoded hash.
child_clear	Clear the given child storage of the given key and its value.
child_clear_prefix	Clear the child storage of each key-value pair where the key starts with the given prefix.
child_exists	Check whether the given key exists in storage.
child_get	All Child api uses :
child_next_key	Get the next key in storage after the given one in lexicographic order in child storage.
child_read	Get key from child storage, placing the value into value_out and return the number of bytes that the entry in storage has beyond the offset or None if the storage entry doesn't exist at all. If value_out length is smaller than the returned length, only value_out length bytes are copied into value_out.
child_root	"Commit" all existing operations and compute the resulting child storage root.
child_set	Set key to value in the child storage denoted by child_storage_key.
child_storage_kill	Clear an entire child storage.
clear	Clear the storage of the given key and its value.
clear_prefix	Clear the storage of each key-value pair where the key starts with the given prefix.
exists	Check whether the given key exists in storage.
get	Returns the data for key in the storage or None if the key can not be found.
next_key	Get the next key in storage after the given one in lexicographic order.
read	Get key from storage, placing the value into value_out and return the number of bytes that the entry in storage has beyond the offset or None if the storage entry doesn't exist at all. If value_out length is smaller than the returned length, only value_out length bytes are copied into value_out.
root	"Commit" all existing operations and compute the resulting storage root.
set	Set key to value in the storage.