52 lines
1.9 KiB
Go
52 lines
1.9 KiB
Go
package exchange
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import (
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"context"
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"github.com/libp2p/go-libp2p-core/network"
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"github.com/libp2p/go-libp2p-core/peer"
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"github.com/filecoin-project/lotus/chain/store"
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"github.com/filecoin-project/lotus/chain/types"
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)
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// Server is the responder side of the ChainExchange protocol. It accepts
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// requests from clients and services them by returning the requested
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// chain data.
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type Server interface {
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// HandleStream is the protocol handler to be registered on a libp2p
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// protocol router.
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//
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// In the current version of the protocol, streams are single-use. The
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// server will read a single Request, and will respond with a single
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// Response. It will dispose of the stream straight after.
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HandleStream(stream network.Stream)
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}
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// Client is the requesting side of the ChainExchange protocol. It acts as
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// a proxy for other components to request chain data from peers. It is chiefly
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// used by the Syncer.
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type Client interface {
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// GetBlocks fetches block headers from the network, from the provided
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// tipset *backwards*, returning as many tipsets as the count parameter,
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// or less.
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GetBlocks(ctx context.Context, tsk types.TipSetKey, count int) ([]*types.TipSet, error)
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// GetChainMessages fetches messages from the network, from the provided
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// tipset *backwards*, returning the messages from as many tipsets as the
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// count parameter, or less.
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GetChainMessages(ctx context.Context, head *types.TipSet, length uint64) ([]*CompactedMessages, error)
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// GetFullTipSet fetches a full tipset from a given peer. If successful,
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// the fetched object contains block headers and all messages in full form.
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GetFullTipSet(ctx context.Context, peer peer.ID, tsk types.TipSetKey) (*store.FullTipSet, error)
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// AddPeer adds a peer to the pool of peers that the Client requests
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// data from.
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AddPeer(peer peer.ID)
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// RemovePeer removes a peer from the pool of peers that the Client
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// requests data from.
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RemovePeer(peer peer.ID)
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}
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