Trait sc_client_api::backend::StorageProvider

source · [−]
pub trait StorageProvider<Block: BlockT, B: Backend<Block>> {
    fn storage(
        &self, 
        id: &BlockId<Block>, 
        key: &StorageKey
    ) -> Result<Option<StorageData>>;

    fn storage_keys(
        &self, 
        id: &BlockId<Block>, 
        key_prefix: &StorageKey
    ) -> Result<Vec<StorageKey>>;

    fn storage_hash(
        &self, 
        id: &BlockId<Block>, 
        key: &StorageKey
    ) -> Result<Option<Block::Hash>>;

    fn storage_pairs(
        &self, 
        id: &BlockId<Block>, 
        key_prefix: &StorageKey
    ) -> Result<Vec<(StorageKey, StorageData)>>;

    fn storage_keys_iter<'a>(
        &self, 
        id: &BlockId<Block>, 
        prefix: Option<&'a StorageKey>, 
        start_key: Option<&StorageKey>
    ) -> Result<KeyIterator<'a, B::State, Block>>;

    fn child_storage(
        &self, 
        id: &BlockId<Block>, 
        child_info: &ChildInfo, 
        key: &StorageKey
    ) -> Result<Option<StorageData>>;

    fn child_storage_keys(
        &self, 
        id: &BlockId<Block>, 
        child_info: &ChildInfo, 
        key_prefix: &StorageKey
    ) -> Result<Vec<StorageKey>>;

    fn child_storage_hash(
        &self, 
        id: &BlockId<Block>, 
        child_info: &ChildInfo, 
        key: &StorageKey
    ) -> Result<Option<Block::Hash>>;

    fn max_key_changes_range(
        &self, 
        first: NumberFor<Block>, 
        last: BlockId<Block>
    ) -> Result<Option<(NumberFor<Block>, BlockId<Block>)>>;

    fn key_changes(
        &self, 
        first: NumberFor<Block>, 
        last: BlockId<Block>, 
        storage_key: Option<&PrefixedStorageKey>, 
        key: &StorageKey
    ) -> Result<Vec<(NumberFor<Block>, u32)>>;
}
Expand description

Provides acess to storage primitives

Required methods

Given a BlockId and a key, return the value under the key in that block.

Given a BlockId and a key prefix, return the matching storage keys in that block.

Given a BlockId and a key, return the value under the hash in that block.

Given a BlockId and a key prefix, return the matching child storage keys and values in that block.

Given a BlockId and a key prefix, return a KeyIterator iterates matching storage keys in that block.

Given a BlockId, a key and a child storage key, return the value under the key in that block.

Given a BlockId, a key prefix, and a child storage key, return the matching child storage keys.

Given a BlockId, a key and a child storage key, return the hash under the key in that block.

Get longest range within [first; last] that is possible to use in key_changes and key_changes_proof calls. Range could be shortened from the beginning if some changes tries have been pruned. Returns Ok(None) if changes tries are not supported.

Get pairs of (block, extrinsic) where key has been changed at given blocks range. Works only for runtimes that are supporting changes tries.

Changes are returned in descending order (i.e. last block comes first).

Implementors