/
runner.go
138 lines (128 loc) · 4.39 KB
/
runner.go
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package client
import (
"context"
"sync"
"time"
"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
pb "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1"
"github.com/prysmaticlabs/prysm/shared/params"
"go.opencensus.io/trace"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// Validator interface defines the primary methods of a validator client.
type Validator interface {
Done()
WaitForChainStart(ctx context.Context) error
WaitForActivation(ctx context.Context) error
WaitForSync(ctx context.Context) error
CanonicalHeadSlot(ctx context.Context) (uint64, error)
NextSlot() <-chan uint64
SlotDeadline(slot uint64) time.Time
LogValidatorGainsAndLosses(ctx context.Context, slot uint64) error
UpdateDuties(ctx context.Context, slot uint64) error
RolesAt(ctx context.Context, slot uint64) (map[[48]byte][]pb.ValidatorRole, error) // validator pubKey -> roles
SubmitAttestation(ctx context.Context, slot uint64, pubKey [48]byte)
ProposeBlock(ctx context.Context, slot uint64, pubKey [48]byte)
SubmitAggregateAndProof(ctx context.Context, slot uint64, pubKey [48]byte)
LogAttestationsSubmitted()
UpdateDomainDataCaches(ctx context.Context, slot uint64)
}
// Run the main validator routine. This routine exits if the context is
// canceled.
//
// Order of operations:
// 1 - Initialize validator data
// 2 - Wait for validator activation
// 3 - Wait for the next slot start
// 4 - Update assignments
// 5 - Determine role at current slot
// 6 - Perform assigned role, if any
func run(ctx context.Context, v Validator) {
defer v.Done()
if err := v.WaitForChainStart(ctx); err != nil {
log.Fatalf("Could not determine if beacon chain started: %v", err)
}
if err := v.WaitForSync(ctx); err != nil {
log.Fatalf("Could not determine if beacon node synced: %v", err)
}
if err := v.WaitForActivation(ctx); err != nil {
log.Fatalf("Could not wait for validator activation: %v", err)
}
headSlot, err := v.CanonicalHeadSlot(ctx)
if err != nil {
log.Fatalf("Could not get current canonical head slot: %v", err)
}
if err := v.UpdateDuties(ctx, headSlot); err != nil {
handleAssignmentError(err, headSlot)
}
for {
ctx, span := trace.StartSpan(ctx, "validator.processSlot")
select {
case <-ctx.Done():
log.Info("Context canceled, stopping validator")
return // Exit if context is canceled.
case slot := <-v.NextSlot():
span.AddAttributes(trace.Int64Attribute("slot", int64(slot)))
slotCtx, cancel := context.WithDeadline(ctx, v.SlotDeadline(slot))
// Report this validator client's rewards and penalties throughout its lifecycle.
log := log.WithField("slot", slot)
if err := v.LogValidatorGainsAndLosses(slotCtx, slot); err != nil {
log.WithError(err).Error("Could not report validator's rewards/penalties")
}
// Keep trying to update assignments if they are nil or if we are past an
// epoch transition in the beacon node's state.
if err := v.UpdateDuties(ctx, slot); err != nil {
handleAssignmentError(err, slot)
cancel()
span.End()
continue
}
// Start fetching domain data for the next epoch.
if helpers.IsEpochEnd(slot) {
go v.UpdateDomainDataCaches(ctx, slot+1)
}
var wg sync.WaitGroup
allRoles, err := v.RolesAt(ctx, slot)
if err != nil {
log.WithError(err).Error("Could not get validator roles")
continue
}
for id, roles := range allRoles {
wg.Add(1)
go func(roles []pb.ValidatorRole, id [48]byte) {
for _, role := range roles {
switch role {
case pb.ValidatorRole_ATTESTER:
go v.SubmitAttestation(slotCtx, slot, id)
case pb.ValidatorRole_PROPOSER:
go v.ProposeBlock(slotCtx, slot, id)
case pb.ValidatorRole_AGGREGATOR:
go v.SubmitAggregateAndProof(slotCtx, slot, id)
case pb.ValidatorRole_UNKNOWN:
log.Debug("No active roles, doing nothing")
default:
log.Warnf("Unhandled role %v", role)
}
}
wg.Done()
}(roles, id)
}
// Wait for all processes to complete, then report span complete.
go func() {
wg.Wait()
v.LogAttestationsSubmitted()
span.End()
}()
}
}
}
func handleAssignmentError(err error, slot uint64) {
if errCode, ok := status.FromError(err); ok && errCode.Code() == codes.NotFound {
log.WithField(
"epoch", slot/params.BeaconConfig().SlotsPerEpoch,
).Warn("Validator not yet assigned to epoch")
} else {
log.WithField("error", err).Error("Failed to update assignments")
}
}