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lightningnetwork / lnd / 12301186252

12 Dec 2024 05:01PM UTC coverage: 48.92% (-9.7%) from 58.642%
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Merge pull request #9309 from yyforyongyu/fix-unit-test

chainntnfs: fix `TestHistoricalConfDetailsTxIndex`

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89.74
/lnwire/short_channel_id.go
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package lnwire
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import (
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        "fmt"
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        "io"
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        "github.com/lightningnetwork/lnd/tlv"
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)
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const (
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        // AliasScidRecordType is the type of the experimental record to denote
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        // the alias being used in an option_scid_alias channel.
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        AliasScidRecordType tlv.Type = 1
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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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// Record returns a TLV record that can be used to encode/decode a
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// ShortChannelID to/from a TLV stream.
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func (c *ShortChannelID) Record() tlv.Record {
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        return tlv.MakeStaticRecord(
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                AliasScidRecordType, c, 8, EShortChannelID, DShortChannelID,
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        )
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}
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// IsDefault returns true if the ShortChannelID represents the zero value for
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// its type.
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func (c ShortChannelID) IsDefault() bool {
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        return c == ShortChannelID{}
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}
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// EShortChannelID is an encoder for ShortChannelID. It is exported so other
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// packages can use the encoding scheme.
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func EShortChannelID(w io.Writer, val interface{}, buf *[8]byte) error {
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        if v, ok := val.(*ShortChannelID); ok {
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                return tlv.EUint64T(w, v.ToUint64(), buf)
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        }
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        return tlv.NewTypeForEncodingErr(val, "lnwire.ShortChannelID")
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}
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// DShortChannelID is a decoder for ShortChannelID. It is exported so other
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// packages can use the decoding scheme.
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func DShortChannelID(r io.Reader, val interface{}, buf *[8]byte,
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        l uint64) error {
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        if v, ok := val.(*ShortChannelID); ok {
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                var scid uint64
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                err := tlv.DUint64(r, &scid, buf, 8)
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                if err != nil {
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                        return err
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                }
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                *v = NewShortChanIDFromInt(scid)
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                return nil
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        }
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        return tlv.NewTypeForDecodingErr(val, "lnwire.ShortChannelID", l, 8)
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}
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