Struct frame_support::migrations::RemoveStorage
source · pub struct RemoveStorage<P: Get<&'static str>, S: Get<&'static str>, DbWeight: Get<RuntimeDbWeight>>(/* private fields */);
Expand description
RemoveStorage
is a utility struct used to remove a storage item from a specific pallet.
This struct is generic over three parameters:
P
is a type that implements theGet
trait for a static string, representing the pallet’s name.S
is a type that implements theGet
trait for a static string, representing the storage name.DbWeight
is a type that implements theGet
trait forRuntimeDbWeight
, providing the weight for database operations.
On runtime upgrade, the on_runtime_upgrade
function will clear the storage from the specified
storage, logging the number of keys removed. If the try-runtime
feature is enabled, the
pre_upgrade
and post_upgrade
functions can be used to verify the storage removal before and
after the upgrade.
§Examples:
construct_runtime! {
pub enum Runtime
{
System: frame_system = 0,
SomePallet: pallet_something = 1,
YourOtherPallets...
}
};
parameter_types! {
pub const SomePallet: &'static str = "SomePallet";
pub const StorageAccounts: &'static str = "Accounts";
pub const StorageAccountCount: &'static str = "AccountCount";
}
pub type Migrations = (
RemoveStorage<SomePallet, StorageAccounts, RocksDbWeight>,
RemoveStorage<SomePallet, StorageAccountCount, RocksDbWeight>,
AnyOtherMigrations...
);
pub type Executive = frame_executive::Executive<
Runtime,
Block,
frame_system::ChainContext<Runtime>,
Runtime,
Migrations
>;
WARNING: RemoveStorage
has no guard rails preventing it from bricking the chain if the
operation of removing storage for the given pallet would exceed the block weight limit.
If your storage has too many keys to be removed in a single block, it is advised to wait for a multi-block scheduler currently under development which will allow for removal of storage items (and performing other heavy migrations) over multiple blocks (see https://github.com/paritytech/substrate/issues/13690).
Trait Implementations§
source§impl<P: Get<&'static str>, S: Get<&'static str>, DbWeight: Get<RuntimeDbWeight>> OnRuntimeUpgrade for RemoveStorage<P, S, DbWeight>
impl<P: Get<&'static str>, S: Get<&'static str>, DbWeight: Get<RuntimeDbWeight>> OnRuntimeUpgrade for RemoveStorage<P, S, DbWeight>
source§fn on_runtime_upgrade() -> Weight
fn on_runtime_upgrade() -> Weight
source§fn pre_upgrade() -> Result<Vec<u8>, TryRuntimeError>
fn pre_upgrade() -> Result<Vec<u8>, TryRuntimeError>
Hooks::pre_upgrade
.source§fn post_upgrade(_state: Vec<u8>) -> Result<(), TryRuntimeError>
fn post_upgrade(_state: Vec<u8>) -> Result<(), TryRuntimeError>
Hooks::post_upgrade
.Auto Trait Implementations§
impl<P, S, DbWeight> RefUnwindSafe for RemoveStorage<P, S, DbWeight>
impl<P, S, DbWeight> Send for RemoveStorage<P, S, DbWeight>
impl<P, S, DbWeight> Sync for RemoveStorage<P, S, DbWeight>
impl<P, S, DbWeight> Unpin for RemoveStorage<P, S, DbWeight>
impl<P, S, DbWeight> UnwindSafe for RemoveStorage<P, S, DbWeight>
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