Struct sc_service::client::Client

pub struct Client<B, E, Block, RA> where
    Block: BlockT,  { /* fields omitted */ }

Substrate Client

Implementations

impl<B, E, Block, RA> Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT,
    Block::Header: Clone, 

pub fn new(
    backend: Arc<B>,
    executor: E,
    build_genesis_storage: &dyn BuildStorage,
    fork_blocks: ForkBlocks<Block>,
    bad_blocks: BadBlocks<Block>,
    execution_extensions: ExecutionExtensions<Block>,
    prometheus_registry: Option<Registry>,
    telemetry: Option<TelemetryHandle>,
    config: ClientConfig<Block>
) -> Result<Self>

Creates new Substrate Client with given blockchain and code executor.

pub fn import_notification_sinks(
    &self
) -> &Mutex<Vec<TracingUnboundedSender<BlockImportNotification<Block>>>>

returns a reference to the block import notification sinks useful for test environments.

pub fn finality_notification_sinks(
    &self
) -> &Mutex<Vec<TracingUnboundedSender<FinalityNotification<Block>>>>

returns a reference to the finality notification sinks useful for test environments.

pub fn state_at(&self, block: &BlockId<Block>) -> Result<B::State>

Get a reference to the state at a given block.

pub fn code_at(&self, id: &BlockId<Block>) -> Result<Vec<u8>>

Get the code at a given block.

pub fn runtime_version_at(&self, id: &BlockId<Block>) -> Result<RuntimeVersion>

Get the RuntimeVersion at a given block.

pub fn header_proof_with_cht_size(
    &self,
    id: &BlockId<Block>,
    cht_size: NumberFor<Block>
) -> Result<(Block::Header, StorageProof)>

Reads given header and generates CHT-based header proof for CHT of given size.

pub fn key_changes_proof_with_cht_size(
    &self,
    first: Block::Hash,
    last: Block::Hash,
    min: Block::Hash,
    max: Block::Hash,
    storage_key: Option<&PrefixedStorageKey>,
    key: &StorageKey,
    cht_size: NumberFor<Block>
) -> Result<ChangesProof<Block::Header>>

Does the same work as key_changes_proof, but assumes that CHTs are of passed size.

pub fn revert(&self, n: NumberFor<Block>) -> Result<NumberFor<Block>>

Attempts to revert the chain by n blocks guaranteeing that no block is reverted past the last finalized block. Returns the number of blocks that were successfully reverted.

pub fn unsafe_revert(
    &mut self,
    n: NumberFor<Block>,
    blacklist: bool
) -> Result<NumberFor<Block>>

Attempts to revert the chain by n blocks disregarding finality. This method will revert any finalized blocks as requested and can potentially leave the node in an inconsistent state. Other modules in the system that persist data and that rely on finality (e.g. consensus parts) will be unaffected by the revert. Use this method with caution and making sure that no other data needs to be reverted for consistency aside from the block data. If blacklist is set to true, will also blacklist reverted blocks from finalizing again. The blacklist is reset upon client restart.

Returns the number of blocks that were successfully reverted.

pub fn chain_info(&self) -> Info<Block>

Get blockchain info.

pub fn block_status(&self, id: &BlockId<Block>) -> Result<BlockStatus>

Get block status.

pub fn header(
    &self,
    id: &BlockId<Block>
) -> Result<Option<<Block as BlockT>::Header>>

Get block header by id.

pub fn body(
    &self,
    id: &BlockId<Block>
) -> Result<Option<Vec<<Block as BlockT>::Extrinsic>>>

Get block body by id.

pub fn uncles(
    &self,
    target_hash: Block::Hash,
    max_generation: NumberFor<Block>
) -> Result<Vec<Block::Hash>>

Gets the uncles of the block with target_hash going back max_generation ancestors.

Trait Implementations

impl<B, E, Block, RA> AuxStore for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT,
    Self: ProvideRuntimeApi<Block>,
    <Self as ProvideRuntimeApi<Block>>::Api: CoreApi<Block>, 

fn insert_aux<'a, 'b: 'a, 'c: 'a, I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>, D: IntoIterator<Item = &'a &'b [u8]>>(
    &self,
    insert: I,
    delete: D
) -> Result<()>

Insert auxiliary data into key-value store.

fn get_aux(&self, key: &[u8]) -> Result<Option<Vec<u8>>>

Query auxiliary data from key-value store.

impl<B, E, Block, RA> AuxStore for &Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT,
    Client<B, E, Block, RA>: ProvideRuntimeApi<Block>,
    <Client<B, E, Block, RA> as ProvideRuntimeApi<Block>>::Api: CoreApi<Block>, 

fn insert_aux<'a, 'b: 'a, 'c: 'a, I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>, D: IntoIterator<Item = &'a &'b [u8]>>(
    &self,
    insert: I,
    delete: D
) -> Result<()>

Insert auxiliary data into key-value store.

fn get_aux(&self, key: &[u8]) -> Result<Option<Vec<u8>>>

Query auxiliary data from key-value store.

impl<B, E, Block, RA> BlockBackend<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn block_body(
    &self,
    id: &BlockId<Block>
) -> Result<Option<Vec<<Block as BlockT>::Extrinsic>>>

Get block body by ID. Returns None if the body is not stored.

fn block(&self, id: &BlockId<Block>) -> Result<Option<SignedBlock<Block>>>

Get full block by id.

fn block_status(&self, id: &BlockId<Block>) -> Result<BlockStatus>

Get block status.

fn justifications(&self, id: &BlockId<Block>) -> Result<Option<Justifications>>

Get block justifications for the block with the given id.

fn block_hash(&self, number: NumberFor<Block>) -> Result<Option<Block::Hash>>

Get block hash by number.

fn indexed_transaction(&self, hash: &Block::Hash) -> Result<Option<Vec<u8>>>

Get single indexed transaction by content hash.

fn has_indexed_transaction(&self, hash: &Block::Hash) -> Result<bool>

Check if transaction index exists.

fn block_indexed_body(
    &self,
    id: &BlockId<Block>
) -> Result<Option<Vec<Vec<u8>>>>

Get all indexed transactions for a block, including renewed transactions.

impl<B, E, Block, RA> BlockBuilderProvider<B, Block, Client<B, E, Block, RA>> for Client<B, E, Block, RA> where
    B: Backend<Block> + Send + Sync + 'static,
    E: CallExecutor<Block> + Send + Sync + 'static,
    Block: BlockT,
    Self: ChainHeaderBackend<Block> + ProvideRuntimeApi<Block>,
    <Self as ProvideRuntimeApi<Block>>::Api: ApiExt<Block, StateBackend = StateBackendFor<B, Block>> + BlockBuilderApi<Block>, 

fn new_block_at<R: Into<RecordProof>>(
    &self,
    parent: &BlockId<Block>,
    inherent_digests: DigestFor<Block>,
    record_proof: R
) -> Result<BlockBuilder<'_, Block, Self, B>>

Create a new block, built on top of parent.

fn new_block(
    &self,
    inherent_digests: DigestFor<Block>
) -> Result<BlockBuilder<'_, Block, Self, B>>

Create a new block, built on the head of the chain.

impl<B, E, Block, RA> BlockIdTo<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block> + Send + Sync,
    Block: BlockT,
    RA: Send + Sync, 

type Error = Error

The error type that will be returned by the functions.

fn to_hash(&self, block_id: &BlockId<Block>) -> Result<Option<Block::Hash>>

Convert the given block_id to the corresponding block hash.

fn to_number(
    &self,
    block_id: &BlockId<Block>
) -> Result<Option<NumberFor<Block>>>

Convert the given block_id to the corresponding block number.

impl<'impl0, B, E, Block, RA> BlockImport<Block> for &'impl0 Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block> + Send + Sync,
    Block: BlockT,
    Client<B, E, Block, RA>: ProvideRuntimeApi<Block>,
    <Client<B, E, Block, RA> as ProvideRuntimeApi<Block>>::Api: CoreApi<Block> + ApiExt<Block, StateBackend = B::State>,
    RA: Sync + Send,
    TransactionFor<B, Block>: Send + 'static, 

NOTE: only use this implementation when you are sure there are NO consensus-level BlockImport objects. Otherwise, importing blocks directly into the client would be bypassing important verification work.

fn import_block<'life0, 'async_trait>(
    &'life0 mut self,
    import_block: BlockImportParams<Block, TransactionFor<B, Block>>,
    new_cache: HashMap<CacheKeyId, Vec<u8>>
) -> Pin<Box<dyn Future<Output = Result<ImportResult, Self::Error>> + Send + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

Import a checked and validated block. If a justification is provided in BlockImportParams then finalized must be true.

NOTE: only use this implementation when there are NO consensus-level BlockImport objects. Otherwise, importing blocks directly into the client would be bypassing important verification work.

If you are not sure that there are no BlockImport objects provided by the consensus algorithm, don’t use this function.

fn check_block<'life0, 'async_trait>(
    &'life0 mut self,
    block: BlockCheckParams<Block>
) -> Pin<Box<dyn Future<Output = Result<ImportResult, Self::Error>> + Send + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

Check block preconditions.

type Error = ConsensusError

The error type.

type Transaction = TransactionFor<B, Block>

The transaction type used by the backend.

impl<B, E, Block, RA> BlockImport<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block> + Send + Sync,
    Block: BlockT,
    Self: ProvideRuntimeApi<Block>,
    <Self as ProvideRuntimeApi<Block>>::Api: CoreApi<Block> + ApiExt<Block, StateBackend = B::State>,
    RA: Sync + Send,
    TransactionFor<B, Block>: Send + 'static, 

type Error = ConsensusError

The error type.

type Transaction = TransactionFor<B, Block>

The transaction type used by the backend.

fn import_block<'life0, 'async_trait>(
    &'life0 mut self,
    import_block: BlockImportParams<Block, Self::Transaction>,
    new_cache: HashMap<CacheKeyId, Vec<u8>>
) -> Pin<Box<dyn Future<Output = Result<ImportResult, Self::Error>> + Send + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

Import a block.

fn check_block<'life0, 'async_trait>(
    &'life0 mut self,
    block: BlockCheckParams<Block>
) -> Pin<Box<dyn Future<Output = Result<ImportResult, Self::Error>> + Send + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

Check block preconditions.

impl<B, E, Block, RA> BlockOf for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

type Type = Block

The type of the block.

impl<B, E, Block, RA> BlockchainEvents<Block> for Client<B, E, Block, RA> where
    E: CallExecutor<Block>,
    Block: BlockT, 

fn import_notification_stream(&self) -> ImportNotifications<Block>

Get block import event stream.

fn storage_changes_notification_stream(
    &self,
    filter_keys: Option<&[StorageKey]>,
    child_filter_keys: Option<&[(StorageKey, Option<Vec<StorageKey>>)]>
) -> Result<StorageEventStream<Block::Hash>>

Get storage changes event stream.

fn finality_notification_stream(&self) -> FinalityNotifications<Block>

Get a stream of finality notifications. Not guaranteed to be fired for every finalized block.

impl<B, E, Block, RA> CallApiAt<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block, Backend = B> + Send + Sync,
    Block: BlockT, 

type StateBackend = B::State

The state backend that is used to store the block states.

fn call_api_at<'a, R: Encode + Decode + PartialEq, NC: FnOnce() -> Result<R, ApiError> + UnwindSafe>(
    &self,
    params: CallApiAtParams<'a, Block, NC, B::State>
) -> Result<NativeOrEncoded<R>, ApiError>

Calls the given api function with the given encoded arguments at the given block and returns the encoded result.

fn runtime_version_at(
    &self,
    at: &BlockId<Block>
) -> Result<RuntimeVersion, ApiError>

Returns the runtime version at the given block.

impl<BE, E, B, RA> Chain<B> for Client<BE, E, B, RA> where
    BE: Backend<B>,
    E: CallExecutor<B>,
    B: BlockT, 

fn block_status(
    &self,
    id: &BlockId<B>
) -> Result<BlockStatus, Box<dyn Error + Send>>

Retrieve the status of the block denoted by the given BlockId.

impl<B, E, Block, RA> ExecutorProvider<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

type Executor = E

executor instance

fn executor(&self) -> &Self::Executor

Get call executor reference.

fn execution_extensions(&self) -> &ExecutionExtensions<Block>

Get a reference to the execution extensions.

impl<B, E, Block, RA> Finalizer<Block, B> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn apply_finality(
    &self,
    operation: &mut ClientImportOperation<Block, B>,
    id: BlockId<Block>,
    justification: Option<Justification>,
    notify: bool
) -> Result<()>

Mark all blocks up to given as finalized in operation.

fn finalize_block(
    &self,
    id: BlockId<Block>,
    justification: Option<Justification>,
    notify: bool
) -> Result<()>

Finalize a block.

impl<B, E, Block, RA> Finalizer<Block, B> for &Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn apply_finality(
    &self,
    operation: &mut ClientImportOperation<Block, B>,
    id: BlockId<Block>,
    justification: Option<Justification>,
    notify: bool
) -> Result<()>

Mark all blocks up to given as finalized in operation.

fn finalize_block(
    &self,
    id: BlockId<Block>,
    justification: Option<Justification>,
    notify: bool
) -> Result<()>

Finalize a block.

impl<B, E, Block, RA> HeaderBackend<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block> + Send + Sync,
    Block: BlockT,
    RA: Send + Sync, 

fn header(&self, id: BlockId<Block>) -> Result<Option<Block::Header>>

Get block header. Returns None if block is not found.

fn info(&self) -> Info<Block>

Get blockchain info.

fn status(&self, id: BlockId<Block>) -> Result<BlockStatus>

Get block status.

fn number(
    &self,
    hash: Block::Hash
) -> Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>>

Get block number by hash. Returns None if the header is not in the chain.

fn hash(&self, number: NumberFor<Block>) -> Result<Option<Block::Hash>>

Get block hash by number. Returns None if the header is not in the chain.

fn block_hash_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<Option<<Block as Block>::Hash>, Error>

Convert an arbitrary block ID into a block hash.

fn block_number_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<Option<<<Block as Block>::Header as Header>::Number>, Error>

Convert an arbitrary block ID into a block hash.

fn expect_header(
    &self,
    id: BlockId<Block>
) -> Result<<Block as Block>::Header, Error>

Get block header. Returns UnknownBlock error if block is not found.

fn expect_block_number_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<<<Block as Block>::Header as Header>::Number, Error>

Convert an arbitrary block ID into a block number. Returns UnknownBlock error if block is not found.

fn expect_block_hash_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<<Block as Block>::Hash, Error>

Convert an arbitrary block ID into a block hash. Returns UnknownBlock error if block is not found.

impl<B, E, Block, RA> HeaderBackend<Block> for &Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block> + Send + Sync,
    Block: BlockT,
    RA: Send + Sync, 

fn header(&self, id: BlockId<Block>) -> Result<Option<Block::Header>>

Get block header. Returns None if block is not found.

fn info(&self) -> Info<Block>

Get blockchain info.

fn status(&self, id: BlockId<Block>) -> Result<BlockStatus>

Get block status.

fn number(
    &self,
    hash: Block::Hash
) -> Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>>

Get block number by hash. Returns None if the header is not in the chain.

fn hash(&self, number: NumberFor<Block>) -> Result<Option<Block::Hash>>

Get block hash by number. Returns None if the header is not in the chain.

fn block_hash_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<Option<<Block as Block>::Hash>, Error>

Convert an arbitrary block ID into a block hash.

fn block_number_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<Option<<<Block as Block>::Header as Header>::Number>, Error>

Convert an arbitrary block ID into a block hash.

fn expect_header(
    &self,
    id: BlockId<Block>
) -> Result<<Block as Block>::Header, Error>

Get block header. Returns UnknownBlock error if block is not found.

fn expect_block_number_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<<<Block as Block>::Header as Header>::Number, Error>

Convert an arbitrary block ID into a block number. Returns UnknownBlock error if block is not found.

fn expect_block_hash_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<<Block as Block>::Hash, Error>

Convert an arbitrary block ID into a block hash. Returns UnknownBlock error if block is not found.

impl<B, E, Block, RA> HeaderMetadata<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

type Error = Error

Error used in case the header metadata is not found.

fn header_metadata(
    &self,
    hash: Block::Hash
) -> Result<CachedHeaderMetadata<Block>, Self::Error>

fn insert_header_metadata(
    &self,
    hash: Block::Hash,
    metadata: CachedHeaderMetadata<Block>
)

fn remove_header_metadata(&self, hash: Block::Hash)

impl<BE, E, B, RA> IndexedBody<B> for Client<BE, E, B, RA> where
    BE: Backend<B>,
    E: CallExecutor<B>,
    B: BlockT, 

fn block_indexed_body(
    &self,
    number: NumberFor<B>
) -> Result<Option<Vec<Vec<u8>>>, Error>

Get all indexed transactions for a block, including renewed transactions.

fn number(&self, hash: B::Hash) -> Result<Option<NumberFor<B>>, Error>

Get block number for a block hash.

impl<B, E, Block, RA> LockImportRun<Block, B> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn lock_import_and_run<R, Err, F>(&self, f: F) -> Result<R, Err> where
    F: FnOnce(&mut ClientImportOperation<Block, B>) -> Result<R, Err>,
    Err: From<Error>, 

Lock the import lock, and run operations inside.

impl<B, E, Block, RA> LockImportRun<Block, B> for &Client<B, E, Block, RA> where
    Block: BlockT,
    B: Backend<Block>,
    E: CallExecutor<Block>, 

fn lock_import_and_run<R, Err, F>(&self, f: F) -> Result<R, Err> where
    F: FnOnce(&mut ClientImportOperation<Block, B>) -> Result<R, Err>,
    Err: From<Error>, 

Lock the import lock, and run operations inside.

impl<B, E, Block, RA> ProofProvider<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn read_proof(
    &self,
    id: &BlockId<Block>,
    keys: &mut dyn Iterator<Item = &[u8]>
) -> Result<StorageProof>

Reads storage value at a given block + key, returning read proof.

fn read_child_proof(
    &self,
    id: &BlockId<Block>,
    child_info: &ChildInfo,
    keys: &mut dyn Iterator<Item = &[u8]>
) -> Result<StorageProof>

Reads child storage value at a given block + storage_key + key, returning read proof.

fn execution_proof(
    &self,
    id: &BlockId<Block>,
    method: &str,
    call_data: &[u8]
) -> Result<(Vec<u8>, StorageProof)>

Execute a call to a contract on top of state in a block of given hash AND returning execution proof.

fn header_proof(
    &self,
    id: &BlockId<Block>
) -> Result<(Block::Header, StorageProof)>

Reads given header and generates CHT-based header proof.

fn key_changes_proof(
    &self,
    first: Block::Hash,
    last: Block::Hash,
    min: Block::Hash,
    max: Block::Hash,
    storage_key: Option<&PrefixedStorageKey>,
    key: &StorageKey
) -> Result<ChangesProof<Block::Header>>

Get proof for computation of (block, extrinsic) pairs where key has been changed at given blocks range. min is the hash of the first block, which changes trie root is known to the requester - when we’re using changes tries from ascendants of this block, we should provide proofs for changes tries roots max is the hash of the last block known to the requester - we can’t use changes tries from descendants of this block. Works only for runtimes that are supporting changes tries.

fn read_proof_collection(
    &self,
    id: &BlockId<Block>,
    start_key: &[u8],
    size_limit: usize
) -> Result<(StorageProof, u32)>

Given a BlockId iterate over all storage values starting at start_key exclusively, building proofs until size limit is reached. Returns combined proof and the number of collected keys.

fn storage_collection(
    &self,
    id: &BlockId<Block>,
    start_key: &[u8],
    size_limit: usize
) -> Result<Vec<(Vec<u8>, Vec<u8>)>>

Given a BlockId iterate over all storage values starting at start_key. Returns collected keys and values.

fn verify_range_proof(
    &self,
    root: Block::Hash,
    proof: StorageProof,
    start_key: &[u8]
) -> Result<(Vec<(Vec<u8>, Vec<u8>)>, bool)>

Verify read storage proof for a set of keys. Returns collected key-value pairs and a flag indicating if iteration is complete.

impl<B, E, Block, RA> ProvideCache<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    Block: BlockT, 

fn cache(&self) -> Option<Arc<dyn Cache<Block>>>

Returns data cache reference, if it is enabled on this backend.

impl<B, E, Block, RA> ProvideRuntimeApi<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block, Backend = B> + Send + Sync,
    Block: BlockT,
    RA: ConstructRuntimeApi<Block, Self>, 

type Api = <RA as ConstructRuntimeApi<Block, Self>>::RuntimeApi

The concrete type that provides the api.

fn runtime_api<'a>(&'a self) -> ApiRef<'a, Self::Api>

Returns the runtime api. The returned instance will keep track of modifications to the storage. Any successful call to an api function, will commit its changes to an internal buffer. Otherwise, the modifications will be discarded. The modifications will not be applied to the storage, even on a commit.

impl<B, E, Block, RA> ProvideUncles<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn uncles(
    &self,
    target_hash: Block::Hash,
    max_generation: NumberFor<Block>
) -> Result<Vec<Block::Header>>

Gets the uncles of the block with target_hash going back max_generation ancestors.

impl<B, E, Block, RA> StorageProvider<Block, B> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

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

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

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

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

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

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

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

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

fn storage(
    &self,
    id: &BlockId<Block>,
    key: &StorageKey
) -> Result<Option<StorageData>>

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

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

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

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

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

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

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

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

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

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

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

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

impl<B, E, Block, RA> UsageProvider<Block> for Client<B, E, Block, RA> where
    B: Backend<Block>,
    E: CallExecutor<Block>,
    Block: BlockT, 

fn usage_info(&self) -> ClientInfo<Block>

Get usage info about current client.