Golang Address.Hash160方法代碼示例

// addrToKey converts known address types to an addrindex key.  An error is
// returned for unsupported types.
func addrToKey(addr btcutil.Address) ([addrKeySize]byte, error) {
	switch addr := addr.(type) {
	case *btcutil.AddressPubKeyHash:
		var result [addrKeySize]byte
		result[0] = addrKeyTypePubKeyHash
		copy(result[1:], addr.Hash160()[:])
		return result, nil

	case *btcutil.AddressScriptHash:
		var result [addrKeySize]byte
		result[0] = addrKeyTypeScriptHash
		copy(result[1:], addr.Hash160()[:])
		return result, nil

	case *btcutil.AddressPubKey:
		var result [addrKeySize]byte
		result[0] = addrKeyTypePubKeyHash
		copy(result[1:], addr.AddressPubKeyHash().Hash160()[:])
		return result, nil
	}

	return [addrKeySize]byte{}, errUnsupportedAddressType
}

// 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
}

// 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) ([]*database.TxListReply, error) {
	db.dbLock.Lock()
	defer db.dbLock.Unlock()

	// Enforce constraints for skip and limit.
	if skip < 0 {
		return nil, errors.New("offset for skip must be positive")
	}
	if limit < 0 {
		return nil, 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, 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)
	for skip != 0 && iter.Next() {
		skip--
	}

	// Iterate through all address indexes that match the targeted prefix.
	var replies []*database.TxListReply
	var rawIndex [12]byte
	for iter.Next() && 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, err
	}

	return replies, nil
}