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pub struct Downloads<ZN, ZV, ZSTip>where
    ZN: Service<Request, Response = Response, Error = Box<dyn Error + Send + Sync + 'static>> + Send + Sync + 'static,
    ZN::Future: Send,
    ZV: Service<Arc<Block>, Response = Hash, Error = Box<dyn Error + Send + Sync + 'static>> + Send + Sync + Clone + 'static,
    ZV::Future: Send,
    ZSTip: ChainTip + Clone + Send + 'static,
{ network: ZN, verifier: ZV, latest_chain_tip: ZSTip, lookahead_limit: usize, pending: FuturesUnordered<JoinHandle<Result<(Height, Hash), (BlockDownloadVerifyError, Hash)>>>, cancel_handles: HashMap<Hash, Sender<()>>, }
Expand description

Represents a [Stream] of download and verification tasks during chain sync.

Fields

network: ZN

A service that forwards requests to connected peers, and returns their responses.

verifier: ZV

A service that verifies downloaded blocks.

latest_chain_tip: ZSTip

Allows efficient access to the best tip of the blockchain.

lookahead_limit: usize

The configured lookahead limit, after applying the minimum limit.

pending: FuturesUnordered<JoinHandle<Result<(Height, Hash), (BlockDownloadVerifyError, Hash)>>>

A list of pending block download and verify tasks.

cancel_handles: HashMap<Hash, Sender<()>>

A list of channels that can be used to cancel pending block download and verify tasks.

Implementations

Initialize a new download stream with the provided network and verifier services. Uses the latest_chain_tip and lookahead_limit to drop blocks that are too far ahead of the current state tip.

The Downloads stream is agnostic to the network policy, so retry and timeout limits should be applied to the network service passed into this constructor.

Queue a block for download and verification.

This method waits for the network to become ready, and returns an error only if the network service fails. It returns immediately after queuing the request.

Cancel all running tasks and reset the downloader state.

Get the number of currently in-flight download tasks.

Trait Implementations

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Values yielded by the stream.
Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more
Returns the bounds on the remaining length of the stream. Read more

Auto Trait Implementations

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Filters the values produced by this stream according to the provided asynchronous predicate. Read more
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Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided closure. Read more
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Take elements from this stream while the provided predicate resolves to true. Read more
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Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
Take elements on this stream while the provided asynchronous predicate resolves to true. Read more
Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available, exiting as soon as an error occurs. Read more
Attempt to transform a stream into a collection, returning a future representing the result of that computation. Read more
An adaptor for chunking up successful items of the stream inside a vector. Read more
Attempt to filter the values produced by this stream according to the provided asynchronous closure. Read more
Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
Flattens a stream of streams into just one continuous stream. Read more
Attempt to execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
Attempt to concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
Attempt to execute several futures from a stream concurrently (unordered). Read more
Attempt to execute several futures from a stream concurrently. Read more
A convenience method for calling [TryStream::try_poll_next] on Unpin stream types. Read more
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