mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2025-01-03 16:37:39 +00:00
120 lines
4.1 KiB
Go
120 lines
4.1 KiB
Go
package rpc
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import (
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"context"
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"errors"
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"fmt"
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"math/big"
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"time"
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ptypes "github.com/gogo/protobuf/types"
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"github.com/prysmaticlabs/prysm/beacon-chain/db"
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pbp2p "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// BeaconServer defines a server implementation of the gRPC Beacon service,
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// providing RPC endpoints for obtaining the canonical beacon chain head,
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// fetching latest observed attestations, and more.
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type BeaconServer struct {
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beaconDB *db.BeaconDB
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ctx context.Context
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powChainService powChainService
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operationService operationService
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incomingAttestation chan *pbp2p.Attestation
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canonicalStateChan chan *pbp2p.BeaconState
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chainStartChan chan time.Time
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}
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// WaitForChainStart queries the logs of the Deposit Contract in order to verify the beacon chain
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// has started its runtime and validators begin their responsibilities. If it has not, it then
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// subscribes to an event stream triggered by the powchain service whenever the ChainStart log does
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// occur in the Deposit Contract on ETH 1.0.
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func (bs *BeaconServer) WaitForChainStart(req *ptypes.Empty, stream pb.BeaconService_WaitForChainStartServer) error {
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ok, genesisTime, err := bs.powChainService.HasChainStartLogOccurred()
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if err != nil {
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return fmt.Errorf("could not determine if ChainStart log has occurred: %v", err)
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}
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if ok {
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res := &pb.ChainStartResponse{
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Started: true,
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GenesisTime: genesisTime,
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}
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return stream.Send(res)
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}
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sub := bs.powChainService.ChainStartFeed().Subscribe(bs.chainStartChan)
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defer sub.Unsubscribe()
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for {
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select {
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case chainStartTime := <-bs.chainStartChan:
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log.Info("Sending ChainStart log and genesis time to connected validator clients")
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res := &pb.ChainStartResponse{
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Started: true,
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GenesisTime: uint64(chainStartTime.Unix()),
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}
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return stream.Send(res)
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case <-sub.Err():
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log.Debug("Subscriber closed, exiting goroutine")
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return nil
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case <-bs.ctx.Done():
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log.Debug("RPC context closed, exiting goroutine")
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return nil
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}
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}
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}
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// CanonicalHead of the current beacon chain. This method is requested on-demand
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// by a validator when it is their time to propose or attest.
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func (bs *BeaconServer) CanonicalHead(ctx context.Context, req *ptypes.Empty) (*pbp2p.BeaconBlock, error) {
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block, err := bs.beaconDB.ChainHead()
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if err != nil {
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return nil, fmt.Errorf("could not get canonical head block: %v", err)
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}
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return block, nil
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}
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// LatestAttestation streams the latest processed attestations to the rpc clients.
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func (bs *BeaconServer) LatestAttestation(req *ptypes.Empty, stream pb.BeaconService_LatestAttestationServer) error {
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sub := bs.operationService.IncomingAttFeed().Subscribe(bs.incomingAttestation)
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defer sub.Unsubscribe()
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for {
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select {
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case attestation := <-bs.incomingAttestation:
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log.Info("Sending attestation to RPC clients")
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if err := stream.Send(attestation); err != nil {
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return err
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}
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case <-sub.Err():
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log.Debug("Subscriber closed, exiting goroutine")
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return nil
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case <-bs.ctx.Done():
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log.Debug("RPC context closed, exiting goroutine")
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return nil
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}
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}
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}
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// Eth1Data fetches the current ETH 1 data which should be used when voting via
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// block proposal.
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// TODO(1463): Implement this.
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func (bs *BeaconServer) Eth1Data(ctx context.Context, _ *ptypes.Empty) (*pb.Eth1DataResponse, error) {
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return &pb.Eth1DataResponse{}, nil
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}
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// PendingDeposits returns a list of pending deposits that are ready for
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// inclusion in the next beacon block.
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func (bs *BeaconServer) PendingDeposits(ctx context.Context, _ *ptypes.Empty) (*pb.PendingDepositsResponse, error) {
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bNum := bs.powChainService.LatestBlockNumber()
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if bNum == nil {
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return nil, errors.New("latest PoW block number is unknown")
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}
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// Only request deposits that have passed the ETH1 follow distance window.
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bNum = bNum.Sub(bNum, big.NewInt(int64(params.BeaconConfig().Eth1FollowDistance)))
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return &pb.PendingDepositsResponse{PendingDeposits: bs.beaconDB.PendingDeposits(ctx, bNum)}, nil
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}
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