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vertex_job.go
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vertex_job.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package bootstrap
import (
"errors"
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/snow/consensus/avalanche"
"github.com/ava-labs/avalanchego/snow/engine/avalanche/vertex"
"github.com/ava-labs/avalanchego/snow/engine/common/queue"
"github.com/ava-labs/avalanchego/utils/logging"
)
var errMissingVtxDependenciesOnAccept = errors.New("attempting to execute blocked vertex")
type vtxParser struct {
log logging.Logger
numAccepted, numDropped prometheus.Counter
manager vertex.Manager
}
func (p *vtxParser) Parse(vtxBytes []byte) (queue.Job, error) {
vtx, err := p.manager.ParseVtx(vtxBytes)
if err != nil {
return nil, err
}
return &vertexJob{
log: p.log,
numAccepted: p.numAccepted,
numDropped: p.numDropped,
vtx: vtx,
}, nil
}
type vertexJob struct {
log logging.Logger
numAccepted, numDropped prometheus.Counter
vtx avalanche.Vertex
}
func (v *vertexJob) ID() ids.ID { return v.vtx.ID() }
func (v *vertexJob) MissingDependencies() (ids.Set, error) {
missing := ids.Set{}
parents, err := v.vtx.Parents()
if err != nil {
return missing, err
}
for _, parent := range parents {
if parent.Status() != choices.Accepted {
missing.Add(parent.ID())
}
}
return missing, nil
}
// Returns true if this vertex job has at least 1 missing dependency
func (v *vertexJob) HasMissingDependencies() (bool, error) {
parents, err := v.vtx.Parents()
if err != nil {
return false, err
}
for _, parent := range parents {
if parent.Status() != choices.Accepted {
return true, nil
}
}
return false, nil
}
func (v *vertexJob) Execute() error {
hasMissingDependencies, err := v.HasMissingDependencies()
if err != nil {
return err
}
if hasMissingDependencies {
v.numDropped.Inc()
return errMissingVtxDependenciesOnAccept
}
txs, err := v.vtx.Txs()
if err != nil {
return err
}
for _, tx := range txs {
if tx.Status() != choices.Accepted {
v.numDropped.Inc()
v.log.Warn("attempting to execute vertex with non-accepted transactions")
return nil
}
}
status := v.vtx.Status()
switch status {
case choices.Unknown, choices.Rejected:
v.numDropped.Inc()
return fmt.Errorf("attempting to execute vertex with status %s", status)
case choices.Processing:
v.numAccepted.Inc()
v.log.Trace("accepting vertex %s in bootstrapping", v.vtx.ID())
if err := v.vtx.Accept(); err != nil {
return fmt.Errorf("failed to accept vertex in bootstrapping: %w", err)
}
}
return nil
}
func (v *vertexJob) Bytes() []byte { return v.vtx.Bytes() }