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blockchain: Refactor fetchInputUtxos

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This change is part of the effort to add utxocache support to btcd.

fetchInputUtxos had mainly 2 functions:
1: Figure out which outpoints to fetch
2: Call fetchUtxosMain to fetch those outpoints

Functionality for (1) is refactored out to fetchInputsToFetch.  This is
done to allow fetchInputUtxos to use the cache to fetch the outpoints
as well in a later commit.
This commit is contained in:
Calvin Kim 2023-05-19 00:29:45 +09:00
parent bcd8f547fe
commit 053ef330f2
1 changed files with 16 additions and 8 deletions
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24
blockchain/utxoviewpoint.go
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@ -578,12 +578,11 @@ func (view *UtxoViewpoint) fetchUtxos(db database.DB, outpoints []wire.OutPoint)
return view.fetchUtxosMain(db, needed)
}
// fetchInputUtxos loads the unspent transaction outputs for the inputs
// referenced by the transactions in the given block into the view from the
// database as needed. In particular, referenced entries that are earlier in
// the block are added to the view and entries that are already in the view are
// not modified.
func (view *UtxoViewpoint) fetchInputUtxos(db database.DB, block *btcutil.Block) error {
// findInputsToFetch goes through all the blocks and returns all the outpoints of
// the entries that need to be fetched in order to validate the block. Outpoints
// for the entries that are already in the block are not included in the returned
// outpoints.
func (view *UtxoViewpoint) findInputsToFetch(block *btcutil.Block) []wire.OutPoint {
// Build a map of in-flight transactions because some of the inputs in
// this block could be referencing other transactions earlier in this
// block which are not yet in the chain.
@ -629,8 +628,17 @@ func (view *UtxoViewpoint) fetchInputUtxos(db database.DB, block *btcutil.Block)
}
}
// Request the input utxos from the database.
return view.fetchUtxosMain(db, needed)
return needed
}
// fetchInputUtxos loads the unspent transaction outputs for the inputs
// referenced by the transactions in the given block into the view from the
// database as needed. In particular, referenced entries that are earlier in
// the block are added to the view and entries that are already in the view are
// not modified.
func (view *UtxoViewpoint) fetchInputUtxos(db database.DB, block *btcutil.Block) error {
// Request the input utxos from the cache.
return view.fetchUtxosMain(db, view.findInputsToFetch(block))
}
// NewUtxoViewpoint returns a new empty unspent transaction output view.