lnd.xprv/lnwire/channel_id.go
Andrey Samokhvalov c3b2854428 lnwire: converge discovery part of messages with specification
Change the name of fields of messages which are belong to the discovery
subsystem in a such way so they were the same with the names that are
defined in the specification.
2017-03-29 19:49:05 -07:00

40 lines
1.3 KiB
Go

package lnwire
// ShortChannelID represent the set of data which is needed to retrieve all
// necessary data to validate the channel existence.
type ShortChannelID struct {
// BlockHeight is the height of the block where funding transaction
// located.
//
// NOTE: This field is limited to 3 bytes.
BlockHeight uint32
// TxIndex is a position of funding transaction within a block.
//
// NOTE: This field is limited to 3 bytes.
TxIndex uint32
// TxPosition indicating transaction output which pays to the channel.
TxPosition uint16
}
// NewShortChanIDFromInt returns a new ShortChannelID which is the decoded
// version of the compact channel ID encoded within the uint64. The format of
// the compact channel ID is as follows: 3 bytes for the block height, 3 bytes
// for the transaction index, and 2 bytes for the output index.
func NewShortChanIDFromInt(chanID uint64) ShortChannelID {
return ShortChannelID{
BlockHeight: uint32(chanID >> 40),
TxIndex: uint32(chanID>>16) & 0xFFFFFF,
TxPosition: uint16(chanID),
}
}
// ToUint64 converts the ShortChannelID into a compact format encoded within a
// uint64 (8 bytes).
func (c *ShortChannelID) ToUint64() uint64 {
// TODO(roasbeef): explicit error on overflow?
return ((uint64(c.BlockHeight) << 40) | (uint64(c.TxIndex) << 16) |
(uint64(c.TxPosition)))
}