// FetchTxsForAddr looks up and returns all transactions which either
// spend from a previously created output of the passed address, or
// create a new output locked to the passed address. The, `limit` parameter
// should be the max number of transactions to be returned. Additionally, if the
// caller wishes to seek forward in the results some amount, the 'seek'
// represents how many results to skip.
func (db *LevelDb) FetchTxsForAddr(addr btcutil.Address, skip int,
limit int, reverse bool) ([]*database.TxListReply, int, error) {
db.dbLock.Lock()
defer db.dbLock.Unlock()
// Enforce constraints for skip and limit.
if skip < 0 {
return nil, 0, errors.New("offset for skip must be positive")
}
if limit < 0 {
return nil, 0, errors.New("value for limit must be positive")
}
// Parse address type, bailing on an unknown type.
var addrKey []byte
switch addr := addr.(type) {
case *btcutil.AddressPubKeyHash:
hash160 := addr.Hash160()
addrKey = hash160[:]
case *btcutil.AddressScriptHash:
hash160 := addr.Hash160()
addrKey = hash160[:]
case *btcutil.AddressPubKey:
hash160 := addr.AddressPubKeyHash().Hash160()
addrKey = hash160[:]
default:
return nil, 0, database.ErrUnsupportedAddressType
}
// Create the prefix for our search.
addrPrefix := make([]byte, 23, 23)
copy(addrPrefix[0:3], addrIndexKeyPrefix)
copy(addrPrefix[3:23], addrKey)
iter := db.lDb.NewIterator(bytesPrefix(addrPrefix), nil)
skipped := 0
if reverse {
// Go to the last element if reverse iterating.
iter.Last()
// Skip "one past" the last element so the loops below don't
// miss the last element due to Prev() being called first.
// We can safely ignore iterator exhaustion since the loops
// below will see there's no keys anyway.
iter.Next()
}
for skip != 0 && advanceIterator(iter, reverse) {
skip--
skipped++
}
// Iterate through all address indexes that match the targeted prefix.
var replies []*database.TxListReply
var rawIndex [12]byte
for advanceIterator(iter, reverse) && limit != 0 {
copy(rawIndex[:], iter.Key()[23:35])
addrIndex := unpackTxIndex(rawIndex)
tx, blkSha, blkHeight, _, err := db.fetchTxDataByLoc(addrIndex.blkHeight,
addrIndex.txoffset, addrIndex.txlen, []byte{})
if err != nil {
// Eat a possible error due to a potential re-org.
continue
}
txSha := tx.TxSha()
txReply := &database.TxListReply{Sha: &txSha, Tx: tx,
BlkSha: blkSha, Height: blkHeight, TxSpent: []bool{}, Err: err}
replies = append(replies, txReply)
limit--
}
iter.Release()
if err := iter.Error(); err != nil {
return nil, 0, err
}
return replies, skipped, nil
}
