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issuer.go
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issuer.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package avalanche
import (
"context"
"go.uber.org/zap"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/consensus/avalanche"
"github.com/ava-labs/avalanchego/snow/consensus/snowstorm"
"github.com/ava-labs/avalanchego/snow/engine/common"
)
// issuer issues [vtx] into consensus after its dependencies are met.
type issuer struct {
t *Transitive
vtx avalanche.Vertex
issued, abandoned bool
vtxDeps, txDeps ids.Set
}
// Register that a vertex we were waiting on has been issued to consensus.
func (i *issuer) FulfillVtx(ctx context.Context, id ids.ID) {
i.vtxDeps.Remove(id)
i.Update(ctx)
}
// Register that a transaction we were waiting on has been issued to consensus.
func (i *issuer) FulfillTx(ctx context.Context, id ids.ID) {
i.txDeps.Remove(id)
i.Update(ctx)
}
// Abandon this attempt to issue
func (i *issuer) Abandon(ctx context.Context) {
if !i.abandoned {
vtxID := i.vtx.ID()
i.t.pending.Remove(vtxID)
i.abandoned = true
i.t.vtxBlocked.Abandon(ctx, vtxID) // Inform vertices waiting on this vtx that it won't be issued
i.t.metrics.blockerVtxs.Set(float64(i.t.vtxBlocked.Len()))
}
}
// Issue the poll when all dependencies are met
func (i *issuer) Update(ctx context.Context) {
if i.abandoned || i.issued || i.vtxDeps.Len() != 0 || i.txDeps.Len() != 0 || i.t.Consensus.VertexIssued(i.vtx) || i.t.errs.Errored() {
return
}
vtxID := i.vtx.ID()
// All dependencies have been met
i.issued = true
// check stop vertex validity
err := i.vtx.Verify(ctx)
if err != nil {
if i.vtx.HasWhitelist() {
// do not update "i.t.errs" since it's only used for critical errors
// which will cause chain shutdown in the engine
// (see "handleSyncMsg" and "handleChanMsg")
i.t.Ctx.Log.Debug("stop vertex verification failed",
zap.Stringer("vtxID", vtxID),
zap.Error(err),
)
i.t.metrics.whitelistVtxIssueFailure.Inc()
} else {
i.t.Ctx.Log.Debug("vertex verification failed",
zap.Stringer("vtxID", vtxID),
zap.Error(err),
)
}
i.t.vtxBlocked.Abandon(ctx, vtxID)
return
}
i.t.pending.Remove(vtxID) // Remove from set of vertices waiting to be issued.
// Make sure the transactions in this vertex are valid
txs, err := i.vtx.Txs(ctx)
if err != nil {
i.t.errs.Add(err)
return
}
validTxs := make([]snowstorm.Tx, 0, len(txs))
for _, tx := range txs {
if err := tx.Verify(ctx); err != nil {
txID := tx.ID()
i.t.Ctx.Log.Debug("transaction verification failed",
zap.Stringer("txID", txID),
zap.Error(err),
)
i.t.txBlocked.Abandon(ctx, txID)
} else {
validTxs = append(validTxs, tx)
}
}
// Some of the transactions weren't valid. Abandon this vertex.
// Take the valid transactions and issue a new vertex with them.
if len(validTxs) != len(txs) {
i.t.Ctx.Log.Debug("abandoning vertex",
zap.String("reason", "transaction verification failed"),
zap.Stringer("vtxID", vtxID),
)
if _, err := i.t.batch(ctx, validTxs, batchOption{}); err != nil {
i.t.errs.Add(err)
}
i.t.vtxBlocked.Abandon(ctx, vtxID)
i.t.metrics.blockerVtxs.Set(float64(i.t.vtxBlocked.Len()))
return
}
i.t.Ctx.Log.Verbo("adding vertex to consensus",
zap.Stringer("vtxID", vtxID),
)
// Add this vertex to consensus.
if err := i.t.Consensus.Add(ctx, i.vtx); err != nil {
i.t.errs.Add(err)
return
}
// Issue a poll for this vertex.
p := i.t.Consensus.Parameters()
vdrs, err := i.t.Validators.Sample(p.K) // Validators to sample
if err != nil {
i.t.Ctx.Log.Error("dropped query",
zap.String("reason", "insufficient number of validators"),
zap.Stringer("vtxID", vtxID),
)
}
vdrBag := ids.NodeIDBag{} // Validators to sample repr. as a set
for _, vdr := range vdrs {
vdrBag.Add(vdr.ID())
}
i.t.RequestID++
if err == nil && i.t.polls.Add(i.t.RequestID, vdrBag) {
numPushTo := i.t.Params.MixedQueryNumPushVdr
if !i.t.Validators.Contains(i.t.Ctx.NodeID) {
numPushTo = i.t.Params.MixedQueryNumPushNonVdr
}
common.SendMixedQuery(
ctx,
i.t.Sender,
vdrBag.List(), // Note that this doesn't contain duplicates; length may be < k
numPushTo,
i.t.RequestID,
vtxID,
i.vtx.Bytes(),
)
}
// Notify vertices waiting on this one that it (and its transactions) have been issued.
i.t.vtxBlocked.Fulfill(ctx, vtxID)
for _, tx := range txs {
i.t.txBlocked.Fulfill(ctx, tx.ID())
}
i.t.metrics.blockerTxs.Set(float64(i.t.txBlocked.Len()))
i.t.metrics.blockerVtxs.Set(float64(i.t.vtxBlocked.Len()))
if i.vtx.HasWhitelist() {
i.t.Ctx.Log.Info("successfully issued stop vertex",
zap.Stringer("vtxID", vtxID),
)
i.t.metrics.whitelistVtxIssueSuccess.Inc()
}
// Issue a repoll
i.t.repoll(ctx)
}
type vtxIssuer struct{ i *issuer }
func (vi *vtxIssuer) Dependencies() ids.Set { return vi.i.vtxDeps }
func (vi *vtxIssuer) Fulfill(ctx context.Context, id ids.ID) { vi.i.FulfillVtx(ctx, id) }
func (vi *vtxIssuer) Abandon(ctx context.Context, _ ids.ID) { vi.i.Abandon(ctx) }
func (vi *vtxIssuer) Update(ctx context.Context) { vi.i.Update(ctx) }
type txIssuer struct{ i *issuer }
func (ti *txIssuer) Dependencies() ids.Set { return ti.i.txDeps }
func (ti *txIssuer) Fulfill(ctx context.Context, id ids.ID) { ti.i.FulfillTx(ctx, id) }
func (ti *txIssuer) Abandon(ctx context.Context, _ ids.ID) { ti.i.Abandon(ctx) }
func (ti *txIssuer) Update(ctx context.Context) { ti.i.Update(ctx) }