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voter.go
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voter.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package avalanche
import (
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/consensus/snowstorm"
"github.com/ava-labs/avalanchego/snow/engine/avalanche/vertex"
)
// Voter records chits received from [vdr] once its dependencies are met.
type voter struct {
t *Transitive
vdr ids.ShortID
requestID uint32
response ids.Set
deps ids.Set
}
func (v *voter) Dependencies() ids.Set { return v.deps }
// Mark that a dependency has been met.
func (v *voter) Fulfill(id ids.ID) {
v.deps.Remove(id)
v.Update()
}
// Abandon this attempt to record chits.
func (v *voter) Abandon(id ids.ID) { v.Fulfill(id) }
func (v *voter) Update() {
if v.deps.Len() != 0 || v.t.errs.Errored() {
return
}
results, finished := v.t.polls.Vote(v.requestID, v.vdr, v.response.List())
if !finished {
return
}
results, err := v.bubbleVotes(results)
if err != nil {
v.t.errs.Add(err)
return
}
v.t.Ctx.Log.Debug("Finishing poll with:\n%s", &results)
if err := v.t.Consensus.RecordPoll(results); err != nil {
v.t.errs.Add(err)
return
}
orphans := v.t.Consensus.Orphans()
txs := make([]snowstorm.Tx, 0, orphans.Len())
for orphanIDKey := range orphans {
orphanID := ids.NewID(orphanIDKey)
if tx, err := v.t.VM.GetTx(orphanID); err == nil {
txs = append(txs, tx)
} else {
v.t.Ctx.Log.Warn("Failed to fetch %s during attempted re-issuance", orphanID)
}
}
if len(txs) > 0 {
v.t.Ctx.Log.Debug("Re-issuing %d transactions", len(txs))
}
if err := v.t.batch(txs, true /*=force*/, false /*empty*/); err != nil {
v.t.errs.Add(err)
return
}
if v.t.Consensus.Quiesce() {
v.t.Ctx.Log.Debug("Avalanche engine can quiesce")
return
}
v.t.Ctx.Log.Debug("Avalanche engine can't quiesce")
v.t.errs.Add(v.t.repoll())
}
func (v *voter) bubbleVotes(votes ids.UniqueBag) (ids.UniqueBag, error) {
bubbledVotes := ids.UniqueBag{}
vertexHeap := vertex.NewHeap()
for voteKey := range votes {
vtx, err := v.t.Manager.GetVertex(ids.NewID(voteKey))
if err != nil {
continue
}
vertexHeap.Push(vtx)
}
for vertexHeap.Len() > 0 {
vtx := vertexHeap.Pop()
vtxID := vtx.ID()
set := votes.GetSet(vtxID)
status := vtx.Status()
if !status.Fetched() {
v.t.Ctx.Log.Verbo("Dropping %d vote(s) for %s because the vertex is unknown",
set.Len(), vtxID)
bubbledVotes.RemoveSet(vtx.ID())
continue
}
if status.Decided() {
v.t.Ctx.Log.Verbo("Dropping %d vote(s) for %s because the vertex is decided",
set.Len(), vtxID)
bubbledVotes.RemoveSet(vtx.ID())
continue
}
if v.t.Consensus.VertexIssued(vtx) {
v.t.Ctx.Log.Verbo("Applying %d vote(s) for %s", set.Len(), vtx.ID())
bubbledVotes.UnionSet(vtx.ID(), set)
} else {
v.t.Ctx.Log.Verbo("Bubbling %d vote(s) for %s because the vertex isn't issued",
set.Len(), vtx.ID())
bubbledVotes.RemoveSet(vtx.ID()) // Remove votes for this vertex because it hasn't been issued
parents, err := vtx.Parents()
if err != nil {
return bubbledVotes, err
}
for _, parentVtx := range parents {
bubbledVotes.UnionSet(parentVtx.ID(), set)
vertexHeap.Push(parentVtx)
}
}
}
return bubbledVotes, nil
}