77 lines
3.3 KiB
Go
77 lines
3.3 KiB
Go
package chainview
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import (
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"github.com/roasbeef/btcd/chaincfg/chainhash"
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"github.com/roasbeef/btcd/wire"
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)
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// FilteredChainView represents a subscription to a certain subset of 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 a 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 []wire.OutPoint, 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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