Struct remote_externalities::Builder

pub struct Builder<B: BlockT> { /* private fields */ }

Builder for remote-externalities.

Implementations

impl<B: BlockT + DeserializeOwned> Builder<B>

pub fn new() -> Self

Create a new builder.

pub fn inject_hashed_key_value(
    self,
    injections: &[(StorageKey, StorageData)]
) -> Self

Inject a manual list of key and values to the storage.

pub fn inject_hashed_prefix(self, hashed: &[u8]) -> Self

Inject a hashed prefix. This is treated as-is, and should be pre-hashed.

This should be used to inject a “PREFIX”, like a storage (double) map.

pub fn inject_default_child_tree_prefix(self) -> Self

Just a utility wrapper of Self::inject_hashed_prefix that injects DEFAULT_CHILD_STORAGE_KEY_PREFIX as a prefix.

If set, this will guarantee that the child-tree data of ALL pallets will be downloaded.

This is not needed if the entire state is being downloaded.

Otherwise, the only other way to make sure a child-tree is manually included is to inject its root (DEFAULT_CHILD_STORAGE_KEY_PREFIX, plus some other postfix) into Self::inject_hashed_key. Unfortunately, there’s no federated way of managing child tree roots as of now and each pallet does its own thing. Therefore, it is not possible for this library to automatically include child trees of pallet X, when its top keys are included.

pub fn inject_hashed_key(self, hashed: &[u8]) -> Self

Inject a hashed key to scrape. This is treated as-is, and should be pre-hashed.

This should be used to inject a “KEY”, like a storage value.

pub fn blacklist_hashed_key(self, hashed: &[u8]) -> Self

Blacklist this hashed key from the final externalities. This is treated as-is, and should be pre-hashed.

pub fn mode(self, mode: Mode<B>) -> Self

Configure a state snapshot to be used.

pub fn state_version(self, version: StateVersion) -> Self

The state version to use.

pub fn overwrite_online_at(self, at: B::Hash) -> Self

overwrite the at value, if mode is set to Mode::Online.

noop if mode is Mode::Offline

pub async fn build(self) -> Result<TestExternalities, &'static str>

Build the test externalities.

Trait Implementations

impl<B: BlockT + DeserializeOwned> Default for Builder<B>

fn default() -> Self

Returns the “default value” for a type.