subspace_farmer::farmer_cache

Struct FarmerCache

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pub struct FarmerCache { /* private fields */ }
Expand description

Farmer cache that aggregates different kinds of caches of multiple disks.

Pieces in PieceCache are stored based on capacity and proximity of piece index to farmer’s network identity. If capacity is not enough to store all pieces in cache then pieces that are further from network identity will be evicted, this is helpful for quick retrieval of pieces from DSN as well as plotting purposes.

PlotCache is used as a supplementary cache and is primarily helpful for smaller farmers where piece cache is not enough to store all the pieces on the network, while there is a lot of space in the plot that is not used by sectors yet and can be leverage as extra caching space.

Implementations§

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impl FarmerCache

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pub fn new<NC>( node_client: NC, peer_id: PeerId, registry: Option<&mut Registry>, ) -> (Self, FarmerCacheWorker<NC>)
where NC: NodeClient,

Create new piece cache instance and corresponding worker.

NOTE: Returned future is async, but does blocking operations and should be running in dedicated thread.

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pub async fn get_piece<Key>(&self, key: Key) -> Option<Piece>
where RecordKey: From<Key>,

Get piece from cache

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pub async fn get_pieces<'a, PieceIndices>( &'a self, piece_indices: PieceIndices, ) -> impl Stream<Item = (PieceIndex, Option<Piece>)> + Send + Unpin + 'a
where PieceIndices: IntoIterator<Item = PieceIndex, IntoIter: Send + 'a> + Send + 'a,

Get pieces from cache.

Number of elements in returned stream is the same as number of unique piece_indices.

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pub async fn has_pieces( &self, piece_indices: Vec<PieceIndex>, ) -> Vec<PieceIndex>

Returns a filtered list of pieces that were found in farmer cache, order is not guaranteed

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pub async fn find_piece( &self, piece_index: PieceIndex, ) -> Option<(PieceCacheId, PieceCacheOffset)>

Find piece in cache and return its retrieval details

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pub async fn find_pieces<PieceIndices>( &self, piece_indices: PieceIndices, ) -> Vec<(PieceIndex, PieceCacheId, PieceCacheOffset)>
where PieceIndices: IntoIterator<Item = PieceIndex>,

Find pieces in cache and return their retrieval details

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pub async fn maybe_store_additional_piece( &self, piece_index: PieceIndex, piece: &Piece, )

Try to store a piece in additional downloaded pieces, if there is space for them

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pub async fn replace_backing_caches( &self, new_piece_caches: Vec<Arc<dyn PieceCache>>, new_plot_caches: Vec<Arc<dyn PlotCache>>, )

Initialize replacement of backing caches

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pub fn on_sync_progress( &self, callback: Arc<dyn Fn(&f32) + Send + Sync + 'static>, ) -> HandlerId

Subscribe to cache sync notifications

Trait Implementations§

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impl Clone for FarmerCache

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fn clone(&self) -> FarmerCache

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

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

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

Formats the value using the given formatter. Read more
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impl LocalRecordProvider for FarmerCache

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fn record(&self, key: &RecordKey) -> Option<ProviderRecord>

Gets a provider record for key that is stored locally

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