Enum ScannerError 

pub enum ScannerError {
    RpcError(Arc<RpcError<TransportErrorKind>>),
    BlockNotFound,
    Timeout,
    BlockExceedsLatest(&'static str, u64, u64),
    InvalidEventCount,
    InvalidMaxBlockRange,
    InvalidBufferCapacity,
    InvalidMaxConcurrentFetches,
    SubscriptionClosed,
    Lagged(u64),
}

Errors emitted by the scanner.

ScannerError values can be returned by builder connect() methods and are also yielded by subscription streams (as Err(ScannerError) items).

All errors except ScannerError::Lagged are terminal and will halt further stream processing.

Variants

RpcError(Arc<RpcError<TransportErrorKind>>)

The underlying RPC transport returned an error.

BlockNotFound

A requested block (by number, hash or tag) could not be retrieved.

Timeout

A timeout elapsed while waiting for an RPC response.

BlockExceedsLatest(&'static str, u64, u64)

A configured block parameter exceeds the latest known block.

InvalidEventCount

The requested event count is invalid (must be greater than zero).

InvalidMaxBlockRange

The configured maximum block range is invalid (must be greater than zero).

InvalidBufferCapacity

The configured stream buffer capacity is invalid (must be greater than zero).

InvalidMaxConcurrentFetches

The configured maximum number of concurrent fetches is invalid (must be greater than zero).

SubscriptionClosed

A block subscription ended (for example, the underlying WebSocket subscription closed).

Lagged(u64)

A subscription consumer could not keep up and some internal messages were skipped.

The contained value is the number of skipped messages reported by the underlying channel. After emitting this error, the subscription stream may continue with newer items.

Trait Implementations

impl Clone for ScannerError

fn clone(&self) -> ScannerError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ScannerError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ScannerError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for ScannerError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Error> for ScannerError

fn from(error: RobustProviderError) -> ScannerError

Converts to this type from the input type.

impl From<RpcError<TransportErrorKind>> for ScannerError

fn from(error: RpcError<TransportErrorKind>) -> Self

Converts to this type from the input type.

impl<T: Clone> PartialEq<ScannerError> for Result<ScannerMessage<T>, ScannerError>

fn eq(&self, other: &ScannerError) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.