lotus/chain/exchange/interfaces.go

51 lines
1.9 KiB
Go

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