Module transactional

Provides functionality around the transaction storage.

Transactional storage provides functionality to run an entire code block in a storage transaction. This means that either the entire changes to the storage are committed or everything is thrown away. This simplifies the writing of functionality that may bail at any point of operation. Otherwise you would need to first verify all storage accesses and then do the storage modifications.

with_transaction provides a way to run a given closure in a transactional context.

Constants

TRANSACTIONAL_LIMIT

The maximum number of nested layers.

TRANSACTION_LEVEL_KEY

The key that is holds the current number of active layers.

Functions

in_storage_layer

Execute the supplied function, ensuring we are at least in one storage layer.

is_transactional

Check if the current call is within a transactional layer.

with_storage_layer

Execute the supplied function, adding a new storage layer.

with_transaction

Execute the supplied function in a new storage transaction.

with_transaction_opaque_err

Same as with_transaction but casts any internal error to ().

with_transaction_unchecked

Same as with_transaction but without a limit check on nested transactional layers.

Type Aliases

Layer

The type that is being used to store the current number of active layers.