2019-08-18 15:33:58 +00:00
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package sync
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import (
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"context"
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2019-12-20 03:18:08 +00:00
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"github.com/libp2p/go-libp2p-core/peer"
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pubsub "github.com/libp2p/go-libp2p-pubsub"
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2019-11-27 05:08:18 +00:00
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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2019-08-18 15:33:58 +00:00
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"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
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2019-08-23 17:48:40 +00:00
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"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
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"github.com/prysmaticlabs/prysm/shared/params"
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2019-12-20 03:18:08 +00:00
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"github.com/prysmaticlabs/prysm/shared/traceutil"
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2019-12-03 19:15:01 +00:00
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"go.opencensus.io/trace"
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2019-08-18 15:33:58 +00:00
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)
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// Clients who receive a voluntary exit on this topic MUST validate the conditions within process_voluntary_exit before
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// forwarding it across the network.
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2019-12-20 03:18:08 +00:00
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func (r *Service) validateVoluntaryExit(ctx context.Context, pid peer.ID, msg *pubsub.Message) bool {
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// Validation runs on publish (not just subscriptions), so we should approve any message from
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// ourselves.
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if pid == r.p2p.PeerID() {
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return true
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}
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2019-09-20 17:54:32 +00:00
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// The head state will be too far away to validate any voluntary exit.
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if r.initialSync.Syncing() {
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2019-12-20 03:18:08 +00:00
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return false
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2019-09-20 17:54:32 +00:00
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}
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2019-12-03 19:15:01 +00:00
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ctx, span := trace.StartSpan(ctx, "sync.validateVoluntaryExit")
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defer span.End()
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2019-12-20 03:18:08 +00:00
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m, err := r.decodePubsubMessage(msg)
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if err != nil {
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log.WithError(err).Error("Failed to decode message")
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traceutil.AnnotateError(span, err)
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return false
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2019-08-22 05:34:25 +00:00
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}
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2019-12-03 19:15:01 +00:00
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2019-12-20 03:18:08 +00:00
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exit, ok := m.(*ethpb.VoluntaryExit)
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if !ok {
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return false
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2019-08-18 15:33:58 +00:00
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}
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2019-08-23 17:48:40 +00:00
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// Retrieve head state, advance state to the epoch slot used specified in exit message.
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2019-11-19 16:12:50 +00:00
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s, err := r.chain.HeadState(ctx)
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if err != nil {
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2019-12-20 03:18:08 +00:00
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return false
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2019-11-19 16:12:50 +00:00
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}
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2019-08-23 17:48:40 +00:00
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exitedEpochSlot := exit.Epoch * params.BeaconConfig().SlotsPerEpoch
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if s.Slot < exitedEpochSlot {
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var err error
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s, err = state.ProcessSlots(ctx, s, exitedEpochSlot)
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if err != nil {
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2019-12-20 03:18:08 +00:00
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return false
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2019-08-23 17:48:40 +00:00
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}
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2019-08-18 15:33:58 +00:00
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}
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2019-08-23 17:48:40 +00:00
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if err := blocks.VerifyExit(s, exit); err != nil {
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2019-12-20 03:18:08 +00:00
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return false
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2019-08-18 15:33:58 +00:00
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}
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2019-12-20 03:18:08 +00:00
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msg.ValidatorData = exit // Used in downstream subscriber
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2019-09-04 00:22:15 +00:00
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2019-12-20 03:18:08 +00:00
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return true
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2019-08-18 15:33:58 +00:00
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}
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