7569cca19b
To avoid code changing underneath the static migrations, we copy the lnwire dependency in its current form into the migration directory. Ideally the migrations doesn't depend on any code that might change, this takes us a step closer.
49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
package lnwire
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import (
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"fmt"
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)
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// ShortChannelID represents 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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// String generates a human-readable representation of the channel ID.
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func (c ShortChannelID) String() string {
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return fmt.Sprintf("%d:%d:%d", c.BlockHeight, c.TxIndex, c.TxPosition)
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}
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