Enum hdk::prelude::ChainQueryFilterRange
source · [−]pub enum ChainQueryFilterRange {
Unbounded,
ActionSeqRange(u32, u32),
ActionHashRange(HoloHash<Action>, HoloHash<Action>),
ActionHashTerminated(HoloHash<Action>, u32),
}
Expand description
Defines several ways that queries can be restricted to a range. Notably hash bounded ranges disambiguate forks whereas sequence indexes do not as the same position can be found in many forks. The reason that this does NOT use native rust range traits is that the hash bounded queries MUST be inclusive otherwise the integrity and fork disambiguation logic is impossible. An exclusive range bound that does not include the final action tells us nothing about which fork to select between N forks of equal length that proceed it. With an inclusive hash bounded range the final action always points unambiguously at the “correct” fork that the range is over. Start hashes are not needed to provide this property so ranges can be hash terminated with a length of preceeding records to return only. Technically the seq bounded ranges do not imply any fork disambiguation and so could be a range but for simplicity we left the API symmetrical in boundedness across all enum variants. @TODO It may be possible to provide/implement RangeBounds in the case that a full sequence of records/actions is provided but it would need to be handled as inclusive first, to enforce the integrity of the query, then the exclusiveness achieved by simply removing the final record after the fact.
Variants
Unbounded
Do NOT apply any range filtering for this query.
ActionSeqRange(u32, u32)
A range over source chain sequence numbers. This is ambiguous over forking histories and so should NOT be used in validation logic. Inclusive start, inclusive end.
ActionHashRange(HoloHash<Action>, HoloHash<Action>)
A range over source chain action hashes. This CAN be used in validation logic as forks are disambiguated. Inclusive start and end (unlike std::ops::Range).
ActionHashTerminated(HoloHash<Action>, u32)
The terminating action hash and N preceeding records.
N = 0 returns only the record with this ActionHash
.
This CAN be used in validation logic as forks are not possible when
“looking up” towards genesis from some ActionHash
.
Trait Implementations
sourceimpl Clone for ChainQueryFilterRange
impl Clone for ChainQueryFilterRange
sourcefn clone(&self) -> ChainQueryFilterRange
fn clone(&self) -> ChainQueryFilterRange
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresourceimpl Debug for ChainQueryFilterRange
impl Debug for ChainQueryFilterRange
sourceimpl Default for ChainQueryFilterRange
impl Default for ChainQueryFilterRange
sourcefn default() -> ChainQueryFilterRange
fn default() -> ChainQueryFilterRange
sourceimpl<'de> Deserialize<'de> for ChainQueryFilterRange
impl<'de> Deserialize<'de> for ChainQueryFilterRange
sourcefn deserialize<__D>(
__deserializer: __D
) -> Result<ChainQueryFilterRange, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(
__deserializer: __D
) -> Result<ChainQueryFilterRange, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
sourceimpl PartialEq<ChainQueryFilterRange> for ChainQueryFilterRange
impl PartialEq<ChainQueryFilterRange> for ChainQueryFilterRange
sourcefn eq(&self, other: &ChainQueryFilterRange) -> bool
fn eq(&self, other: &ChainQueryFilterRange) -> bool
sourceimpl Serialize for ChainQueryFilterRange
impl Serialize for ChainQueryFilterRange
sourcefn serialize<__S>(
&self,
__serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
fn serialize<__S>(
&self,
__serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
impl StructuralPartialEq for ChainQueryFilterRange
Auto Trait Implementations
impl RefUnwindSafe for ChainQueryFilterRange
impl Send for ChainQueryFilterRange
impl Sync for ChainQueryFilterRange
impl Unpin for ChainQueryFilterRange
impl UnwindSafe for ChainQueryFilterRange
Blanket Implementations
impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
type ArchivedMetadata = ()
type ArchivedMetadata = ()
fn pointer_metadata(
&<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
fn pointer_metadata(
&<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T>where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T>where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T>where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T>where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T>where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T>where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T>where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T>where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;