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