Enum NotAvailable 

pub enum NotAvailable {
    NotWatched(Address),
    BeforeStart {
        requested: u64,
        start: u64,
    },
    AfterHead {
        requested: u64,
        head: u64,
    },
    NotSynced,
    InvalidRange {
        start: u64,
        end: u64,
    },
    NeverRecorded,
    UnknownBefore {
        first_seen: u64,
    },
    Internal(String),
}

Why a read has no answer. Promise #3 lives here: a caller always learns which boundary it hit, and never receives a zero in place of “unknown”.

Variants

NotWatched(Address)

The address is not on the watchlist.

BeforeStart

The block precedes the address’s watch start.

Fields

requested: u64

Requested block.

start: u64

Watch start for this address.

AfterHead

The block is beyond what the archive has applied.

Fields

requested: u64

Requested block.

head: u64

Current archive head.

NotSynced

No block has been applied yet.

InvalidRange

start >= end: a caller error, reported rather than answered with nothing.

Fields

start: u64

Range start.

end: u64

Range end (exclusive).

NeverRecorded

No change to the slot has been recorded since start, and the address was not seen being created: its value is not known. Backfill to the contract’s creation (Archive::backfill) or prove it at the head (Archive::bootstrap_slot).

UnknownBefore

The slot’s earliest recorded change is at first_seen; nothing is known before it yet. Backfill further back (or prove it while the node’s state window still allows).

Fields

first_seen: u64

Block of the earliest recorded change.

Internal(String)

Storage failure surfaced through a read.

Trait Implementations

impl Clone for NotAvailable

fn clone(&self) -> NotAvailable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NotAvailable

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

Formats the value using the given formatter.

impl Display for NotAvailable

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

Formats the value using the given formatter.

impl Eq for NotAvailable

impl Error for NotAvailable

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<ArchiveError> for NotAvailable

fn from(e: ArchiveError) -> Self

Converts to this type from the input type.

impl PartialEq for NotAvailable

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for NotAvailable