Module storage

Expand description

Interface for accessing the storage from within the runtime.

Structs§

append: Append the encoded value to the storage item at key.
changes_root: Always returns None. This function exists for compatibility reasons.
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.
commit_transaction: Commit the last transaction started by start_transaction.
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.
rollback_transaction: Rollback the last transaction started by start_transaction.
root: “Commit” all existing operations and compute the resulting storage root.
set: Set key to value in the storage.
start_transaction: Start a new nested transaction.