108 lines
1.9 KiB
Go
108 lines
1.9 KiB
Go
package types
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"github.com/ipfs/go-cid"
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)
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type TipSet struct {
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cids []cid.Cid
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blks []*BlockHeader
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height uint64
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}
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// why didnt i just export the fields? Because the struct has methods with the
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// same names already
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type expTipSet struct {
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Cids []cid.Cid
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Blocks []*BlockHeader
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Height uint64
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}
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func (ts *TipSet) MarshalJSON() ([]byte, error) {
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return json.Marshal(expTipSet{
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Cids: ts.cids,
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Blocks: ts.blks,
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Height: ts.height,
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})
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}
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func (ts *TipSet) UnmarshalJSON(b []byte) error {
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var ets expTipSet
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if err := json.Unmarshal(b, &ets); err != nil {
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return err
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}
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ts.cids = ets.Cids
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ts.blks = ets.Blocks
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ts.height = ets.Height
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return nil
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}
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func NewTipSet(blks []*BlockHeader) (*TipSet, error) {
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var ts TipSet
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ts.cids = []cid.Cid{blks[0].Cid()}
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ts.blks = blks
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for _, b := range blks[1:] {
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if b.Height != blks[0].Height {
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return nil, fmt.Errorf("cannot create tipset with mismatching heights")
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}
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ts.cids = append(ts.cids, b.Cid())
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}
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ts.height = blks[0].Height
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return &ts, nil
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}
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func (ts *TipSet) Cids() []cid.Cid {
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return ts.cids
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}
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func (ts *TipSet) Height() uint64 {
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return ts.height
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}
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func (ts *TipSet) Weight() uint64 {
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panic("if tipsets are going to have weight on them, we need to wire that through")
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}
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func (ts *TipSet) Parents() []cid.Cid {
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return ts.blks[0].Parents
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}
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func (ts *TipSet) Blocks() []*BlockHeader {
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return ts.blks
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}
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func (ts *TipSet) Equals(ots *TipSet) bool {
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if len(ts.blks) != len(ots.blks) {
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return false
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}
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for i, b := range ts.blks {
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if b.Cid() != ots.blks[i].Cid() {
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return false
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}
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}
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return true
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}
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func (ts *TipSet) MinTicket() *Ticket {
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if len(ts.Blocks()) == 0 {
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panic("tipset has no blocks!")
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}
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var minTicket *Ticket
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for _, b := range ts.Blocks() {
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lastTicket := b.Tickets[len(b.Tickets)-1]
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if minTicket == nil || bytes.Compare(lastTicket.VDFResult, minTicket.VDFResult) < 0 {
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minTicket = lastTicket
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}
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}
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return minTicket
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}
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