Struct zebra_state::LatestChainTip

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pub struct LatestChainTip {
    receiver: WatchReceiver<Option<ChainTipBlock>>,
}
Expand description

Efficient access to the state’s current best chain tip.

Each method returns data from the latest tip, regardless of how many times you call it.

Cloned instances provide identical tip data.

The chain tip data is based on:

  • the best non-finalized chain tip, if available, or
  • the finalized tip.

§Note

If a lot of blocks are committed at the same time, the latest tip will skip some blocks in the chain.

Fields§

§receiver: WatchReceiver<Option<ChainTipBlock>>

The receiver for the current chain tip’s data.

Implementations§

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impl LatestChainTip

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fn new(receiver: Receiver<Option<ChainTipBlock>>) -> Self

Create a new LatestChainTip from a watch channel receiver.

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fn with_chain_tip_block<U, F>(&self, f: F) -> Option<U>
where F: FnOnce(&ChainTipBlock) -> U,

Maps the current data ChainTipData to Option<U> by applying a function to the watched value, while holding the receiver lock as briefly as possible.

This helper method is a shorter way to borrow the value from the [watch::Receiver] and extract some information from it, while also adding the current chain tip block’s fields as records to the current span.

A single read lock is acquired to clone T, and then released after the clone. See the performance note on WatchReceiver::with_watch_data.

Does not mark the watched data as seen.

§Correctness

To avoid deadlocks, see the correctness note on WatchReceiver::with_watch_data.

Trait Implementations§

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impl ChainTip for LatestChainTip

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fn best_tip_changed(&mut self) -> BestTipChanged<'_>

Returns when the state tip changes.

Marks the state tip as seen when the returned future completes.

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fn mark_best_tip_seen(&mut self)

Mark the current best state tip as seen.

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fn best_tip_height(&self) -> Option<Height>

Returns the height of the best chain tip. Read more
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fn best_tip_hash(&self) -> Option<Hash>

Returns the block hash of the best chain tip. Read more
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fn best_tip_height_and_hash(&self) -> Option<(Height, Hash)>

Returns the height and the hash of the best chain tip. Read more
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fn best_tip_block_time(&self) -> Option<DateTime<Utc>>

Returns the block time of the best chain tip. Read more
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fn best_tip_height_and_block_time(&self) -> Option<(Height, DateTime<Utc>)>

Returns the height and the block time of the best chain tip. Returning both values at the same time guarantees that they refer to the same chain tip. Read more
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fn best_tip_mined_transaction_ids(&self) -> Arc<[Hash]>

Returns the mined transaction IDs of the transactions in the best chain tip block. Read more
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fn estimate_network_chain_tip_height( &self, network: &Network, now: DateTime<Utc>, ) -> Option<Height>

Return an estimate of the network chain tip’s height. Read more
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fn estimate_distance_to_network_chain_tip( &self, network: &Network, ) -> Option<(i64, Height)>

Return an estimate of how many blocks there are ahead of Zebra’s best chain tip until the network chain tip, and Zebra’s best chain tip height. Read more
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impl Clone for LatestChainTip

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fn clone(&self) -> LatestChainTip

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl Debug for LatestChainTip

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

Formats the value using the given formatter. Read more

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Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more