113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
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package change
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import (
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"bytes"
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"encoding/binary"
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"github.com/lbryio/lbcd/chaincfg/chainhash"
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"github.com/lbryio/lbcd/wire"
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)
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type ChangeType uint32
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const (
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AddClaim ChangeType = iota
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SpendClaim
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UpdateClaim
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AddSupport
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SpendSupport
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)
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type Change struct {
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Type ChangeType
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Height int32
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Name []byte
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ClaimID ClaimID
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OutPoint wire.OutPoint
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Amount int64
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ActiveHeight int32
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VisibleHeight int32 // aka, CreatedAt; used for normalization fork
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SpentChildren map[string]bool
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}
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func NewChange(typ ChangeType) Change {
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return Change{Type: typ}
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}
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func (c Change) SetHeight(height int32) Change {
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c.Height = height
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return c
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}
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func (c Change) SetName(name []byte) Change {
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c.Name = name // need to clone it?
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return c
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}
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func (c Change) SetOutPoint(op *wire.OutPoint) Change {
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c.OutPoint = *op
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return c
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}
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func (c Change) SetAmount(amt int64) Change {
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c.Amount = amt
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return c
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}
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func (c *Change) Marshal(enc *bytes.Buffer) error {
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enc.Write(c.ClaimID[:])
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enc.Write(c.OutPoint.Hash[:])
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var temp [8]byte
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binary.BigEndian.PutUint32(temp[:4], c.OutPoint.Index)
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enc.Write(temp[:4])
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binary.BigEndian.PutUint32(temp[:4], uint32(c.Type))
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enc.Write(temp[:4])
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binary.BigEndian.PutUint32(temp[:4], uint32(c.Height))
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enc.Write(temp[:4])
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binary.BigEndian.PutUint32(temp[:4], uint32(c.ActiveHeight))
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enc.Write(temp[:4])
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binary.BigEndian.PutUint32(temp[:4], uint32(c.VisibleHeight))
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enc.Write(temp[:4])
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binary.BigEndian.PutUint64(temp[:], uint64(c.Amount))
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enc.Write(temp[:])
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if c.SpentChildren != nil {
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binary.BigEndian.PutUint32(temp[:4], uint32(len(c.SpentChildren)))
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enc.Write(temp[:4])
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for key := range c.SpentChildren {
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binary.BigEndian.PutUint16(temp[:2], uint16(len(key))) // technically limited to 255; not sure we trust it
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enc.Write(temp[:2])
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enc.WriteString(key)
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}
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} else {
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binary.BigEndian.PutUint32(temp[:4], 0)
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enc.Write(temp[:4])
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}
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return nil
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}
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func (c *Change) Unmarshal(dec *bytes.Buffer) error {
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copy(c.ClaimID[:], dec.Next(ClaimIDSize))
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copy(c.OutPoint.Hash[:], dec.Next(chainhash.HashSize))
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c.OutPoint.Index = binary.BigEndian.Uint32(dec.Next(4))
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c.Type = ChangeType(binary.BigEndian.Uint32(dec.Next(4)))
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c.Height = int32(binary.BigEndian.Uint32(dec.Next(4)))
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c.ActiveHeight = int32(binary.BigEndian.Uint32(dec.Next(4)))
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c.VisibleHeight = int32(binary.BigEndian.Uint32(dec.Next(4)))
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c.Amount = int64(binary.BigEndian.Uint64(dec.Next(8)))
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keys := binary.BigEndian.Uint32(dec.Next(4))
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if keys > 0 {
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c.SpentChildren = map[string]bool{}
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}
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for keys > 0 {
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keys--
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keySize := int(binary.BigEndian.Uint16(dec.Next(2)))
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key := string(dec.Next(keySize))
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c.SpentChildren[key] = true
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}
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return nil
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}
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