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HTTP endpoint for
GetChainHead (#14262)
* add getChainHead endpoint * James' review * Radek' review --------- Co-authored-by: Radosław Kapka <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| package core | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/prysmaticlabs/prysm/v5/config/params" | ||
| consensusblocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks" | ||
| "github.com/prysmaticlabs/prysm/v5/encoding/bytesutil" | ||
| ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1" | ||
| "github.com/prysmaticlabs/prysm/v5/time/slots" | ||
| ) | ||
|
|
||
| // Retrieve chain head information from the DB and the current beacon state. | ||
| func (s *Service) ChainHead(ctx context.Context) (*ethpb.ChainHead, *RpcError) { | ||
| headBlock, err := s.HeadFetcher.HeadBlock(ctx) | ||
| if err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "could not get head block"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
| if err := consensusblocks.BeaconBlockIsNil(headBlock); err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "head block of chain was nil"), | ||
| Reason: NotFound, | ||
| } | ||
| } | ||
| optimisticStatus, err := s.OptimisticModeFetcher.IsOptimistic(ctx) | ||
| if err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "could not get optimistic status"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
| headBlockRoot, err := headBlock.Block().HashTreeRoot() | ||
| if err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "could not get head block root"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
|
|
||
| validGenesis := false | ||
| validateCP := func(cp *ethpb.Checkpoint, name string) error { | ||
| if bytesutil.ToBytes32(cp.Root) == params.BeaconConfig().ZeroHash && cp.Epoch == 0 { | ||
| if validGenesis { | ||
| return nil | ||
| } | ||
| // Retrieve genesis block in the event we have genesis checkpoints. | ||
| genBlock, err := s.BeaconDB.GenesisBlock(ctx) | ||
| if err != nil || consensusblocks.BeaconBlockIsNil(genBlock) != nil { | ||
| return errors.New("could not get genesis block") | ||
| } | ||
| validGenesis = true | ||
| return nil | ||
| } | ||
| b, err := s.BeaconDB.Block(ctx, bytesutil.ToBytes32(cp.Root)) | ||
| if err != nil { | ||
| return errors.Errorf("could not get %s block: %v", name, err) | ||
| } | ||
| if err := consensusblocks.BeaconBlockIsNil(b); err != nil { | ||
| return errors.Errorf("could not get %s block: %v", name, err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| finalizedCheckpoint := s.FinalizedFetcher.FinalizedCheckpt() | ||
| if err := validateCP(finalizedCheckpoint, "finalized"); err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrap(err, "could not get finalized checkpoint"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
|
|
||
| justifiedCheckpoint := s.FinalizedFetcher.CurrentJustifiedCheckpt() | ||
| if err := validateCP(justifiedCheckpoint, "justified"); err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrap(err, "could not get current justified checkpoint"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
|
|
||
| prevJustifiedCheckpoint := s.FinalizedFetcher.PreviousJustifiedCheckpt() | ||
| if err := validateCP(prevJustifiedCheckpoint, "prev justified"); err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrap(err, "could not get previous justified checkpoint"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
|
|
||
| fSlot, err := slots.EpochStart(finalizedCheckpoint.Epoch) | ||
| if err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "could not get epoch start slot from finalized checkpoint epoch"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
| jSlot, err := slots.EpochStart(justifiedCheckpoint.Epoch) | ||
| if err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "could not get epoch start slot from justified checkpoint epoch"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
| pjSlot, err := slots.EpochStart(prevJustifiedCheckpoint.Epoch) | ||
| if err != nil { | ||
| return nil, &RpcError{ | ||
| Err: errors.Wrapf(err, "could not get epoch start slot from prev justified checkpoint epoch"), | ||
| Reason: Internal, | ||
| } | ||
| } | ||
| return ðpb.ChainHead{ | ||
| HeadSlot: headBlock.Block().Slot(), | ||
| HeadEpoch: slots.ToEpoch(headBlock.Block().Slot()), | ||
| HeadBlockRoot: headBlockRoot[:], | ||
| FinalizedSlot: fSlot, | ||
| FinalizedEpoch: finalizedCheckpoint.Epoch, | ||
| FinalizedBlockRoot: finalizedCheckpoint.Root, | ||
| JustifiedSlot: jSlot, | ||
| JustifiedEpoch: justifiedCheckpoint.Epoch, | ||
| JustifiedBlockRoot: justifiedCheckpoint.Root, | ||
| PreviousJustifiedSlot: pjSlot, | ||
| PreviousJustifiedEpoch: prevJustifiedCheckpoint.Epoch, | ||
| PreviousJustifiedBlockRoot: prevJustifiedCheckpoint.Root, | ||
| OptimisticStatus: optimisticStatus, | ||
| }, nil | ||
| } |
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