subspace_data_retrieval::object_fetcher

Struct ObjectFetcher

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pub struct ObjectFetcher<PG>
where
    PG: PieceGetter + Send + Sync,
{ /* private fields */ }
Expand description

Object fetcher for the Subspace DSN.

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impl<PG> ObjectFetcher<PG>
where PG: PieceGetter + Send + Sync,

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pub fn new(piece_getter: Arc<PG>, max_object_len: usize) -> Self

Create a new object fetcher with the given configuration.

max_object_len is the amount of data bytes we’ll read for a single object before giving up and returning an error. In this implementation, it is limited to max_supported_object_length(), which is much larger than the maximum consensus block size.

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pub async fn fetch_objects( &self, mappings: GlobalObjectMapping, ) -> Result<Vec<Vec<u8>>, Error>

Assemble the objects in mapping by fetching necessary pieces using the piece getter, and putting the objects’ bytes together.

Checks the objects’ hashes to make sure the correct bytes are returned.

For efficiency, objects in a batch should be sorted by increasing piece index. Objects with the same piece index should be sorted by increasing offset. This allows the last piece to be re-used for the next object in the batch.

Batches should be split if the gap between object piece indexes is 6 or more. Those objects can’t share any pieces, because a maximum-sized object only uses 6 pieces.

Auto Trait Implementations§

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impl<PG> Freeze for ObjectFetcher<PG>

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impl<PG> RefUnwindSafe for ObjectFetcher<PG>
where PG: RefUnwindSafe,

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impl<PG> Send for ObjectFetcher<PG>

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impl<PG> Sync for ObjectFetcher<PG>

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impl<PG> Unpin for ObjectFetcher<PG>

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impl<PG> UnwindSafe for ObjectFetcher<PG>
where PG: RefUnwindSafe,

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