/
finality.go
53 lines (48 loc) · 1.55 KB
/
finality.go
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package evaluators
import (
"context"
"fmt"
ptypes "github.com/gogo/protobuf/types"
"github.com/pkg/errors"
eth "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
)
// FinalizationOccurs is an evaluator to make sure finalization is performing as it should.
// Requires to be run after at least 4 epochs have passed.
var FinalizationOccurs = Evaluator{
Name: "finalizes_at_epoch_%d",
Policy: afterNthEpoch(3),
Evaluation: finalizationOccurs,
}
func finalizationOccurs(client eth.BeaconChainClient) error {
chainHead, err := client.GetChainHead(context.Background(), &ptypes.Empty{})
if err != nil {
return errors.Wrap(err, "failed to get chain head")
}
currentEpoch := chainHead.HeadEpoch
finalizedEpoch := chainHead.FinalizedEpoch
expectedFinalizedEpoch := currentEpoch - 2
if expectedFinalizedEpoch != finalizedEpoch {
return fmt.Errorf(
"expected finalized epoch to be %d, received: %d",
expectedFinalizedEpoch,
finalizedEpoch,
)
}
previousJustifiedEpoch := chainHead.PreviousJustifiedEpoch
currentJustifiedEpoch := chainHead.JustifiedEpoch
if previousJustifiedEpoch+1 != currentJustifiedEpoch {
return fmt.Errorf(
"there should be no gaps between current and previous justified epochs, received current %d and previous %d",
currentJustifiedEpoch,
previousJustifiedEpoch,
)
}
if currentJustifiedEpoch+1 != currentEpoch {
return fmt.Errorf(
"there should be no gaps between current epoch and current justified epoch, received current %d and justified %d",
currentEpoch,
currentJustifiedEpoch,
)
}
return nil
}