ec0fb9c537
In this commit, we update the existing UpdateFilter method to take the new channeldb.EdgePoint struct in place of the prior wire.OutPoint. We must do this as the caller now typically has this type due to the preparation to enable lnd to be able to be compatible with the new neutrino protocol.
78 lines
3.4 KiB
Go
78 lines
3.4 KiB
Go
package chainview
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import (
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/channeldb"
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)
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// FilteredChainView represents a subscription to a certain subset of the
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// UTXO set for a particular chain. This interface is useful from the point of
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// view of maintaining an up-to-date channel graph for the Lightning Network.
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// The subset of the UTXO to be subscribed is that of all the currently opened
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// channels. Each time a channel is closed (the output is spent), a
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// notification is to be sent allowing the graph to be pruned.
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//
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// NOTE: As FilteredBlocks are generated, it is recommended that
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// implementations reclaim the space occupied by newly spent outputs.
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type FilteredChainView interface {
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// FilteredBlocks returns the channel that filtered blocks are to be
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// sent over. Each time a block is connected to the end of a main
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// chain, and appropriate FilteredBlock which contains the transactions
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// which mutate our watched UTXO set is to be returned. In case of a
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// UpdateFilter call with an updateHeight lower than the current best
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// height, blocks with the updated filter will be resent, and must be
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// handled by the receiver as an update to an already known block, NOT
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// as a new block being connected to the chain.
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FilteredBlocks() <-chan *FilteredBlock
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// DisconnectedBlocks returns a receive only channel which will be sent
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// upon with the empty filtered blocks of blocks which are disconnected
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// from the main chain in the case of a re-org.
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// NOTE: In case of a reorg, connected blocks will not be available to
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// read from the FilteredBlocks() channel before all disconnected block
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// have been received.
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DisconnectedBlocks() <-chan *FilteredBlock
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// UpdateFilter updates the UTXO filter which is to be consulted when
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// creating FilteredBlocks to be sent to subscribed clients. This
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// method is cumulative meaning repeated calls to this method should
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// _expand_ the size of the UTXO sub-set currently being watched. If
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// the set updateHeight is _lower_ than the best known height of the
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// implementation, then the state should be rewound to ensure all
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// relevant notifications are dispatched, meaning blocks with a height
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// lower than the best known height might be sent over the
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// FilteredBlocks() channel.
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UpdateFilter(ops []channeldb.EdgePoint, updateHeight uint32) error
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// FilterBlock takes a block hash, and returns a FilteredBlocks which
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// is the result of applying the current registered UTXO sub-set on the
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// block corresponding to that block hash.
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//
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// TODO(roasbeef): make a version that does by height also?
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FilterBlock(blockHash *chainhash.Hash) (*FilteredBlock, error)
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// Start starts all goroutine necessary for the operation of the
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// FilteredChainView implementation.
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Start() error
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// Stop stops all goroutines which we launched by the prior call to the
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// Start method.
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Stop() error
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}
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// FilteredBlock is a block which includes the transactions that modify the
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// subscribed sub-set of the UTXO set registered to the current
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// FilteredChainView concrete implementation.
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type FilteredBlock struct {
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// Hash is the hash of the newly filtered block.
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Hash chainhash.Hash
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// Height is the height of the newly filtered block.
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Height uint32
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// Transactions is the set of transactions which modify (spend) the
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// subscribed UTXO subset.
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Transactions []*wire.MsgTx
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}
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