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service.go
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service.go
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// Package service defines the service used to retrieve slashings proofs and
// feed attestations and block headers into the slasher db.
package service
import (
"context"
"fmt"
"net"
"os"
"os/signal"
"path"
"sync"
"syscall"
middleware "github.com/grpc-ecosystem/go-grpc-middleware"
recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
grpc_opentracing "github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/pkg/errors"
eth "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
slashpb "github.com/prysmaticlabs/prysm/proto/slashing"
"github.com/prysmaticlabs/prysm/shared/cmd"
"github.com/prysmaticlabs/prysm/shared/debug"
"github.com/prysmaticlabs/prysm/shared/version"
"github.com/prysmaticlabs/prysm/slasher/cache"
"github.com/prysmaticlabs/prysm/slasher/db"
"github.com/prysmaticlabs/prysm/slasher/db/kv"
"github.com/prysmaticlabs/prysm/slasher/flags"
"github.com/prysmaticlabs/prysm/slasher/rpc"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"go.opencensus.io/plugin/ocgrpc"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/reflection"
)
var log logrus.FieldLogger
const slasherDBName = "slasherdata"
var committeesCache = cache.NewCommitteesCache()
func init() {
log = logrus.WithField("prefix", "slasherRPC")
}
// Service defining an RPC server for the slasher service.
type Service struct {
slasherDb *kv.Store
grpcServer *grpc.Server
slasher *rpc.Server
port int
withCert string
withKey string
listener net.Listener
credentialError error
failStatus error
ctx *cli.Context
lock sync.RWMutex
stop chan struct{} // Channel to wait for termination notifications.
context context.Context
beaconConn *grpc.ClientConn
beaconProvider string
beaconCert string
beaconClient eth.BeaconChainClient
started bool
}
// Config options for the slasher server.
type Config struct {
Port int
CertFlag string
KeyFlag string
SlasherDb *kv.Store
BeaconProvider string
BeaconCert string
}
// NewRPCService creates a new instance of a struct implementing the SlasherService
// interface.
func NewRPCService(cfg *Config, ctx *cli.Context) (*Service, error) {
s := &Service{
slasherDb: cfg.SlasherDb,
port: cfg.Port,
withCert: cfg.CertFlag,
withKey: cfg.KeyFlag,
ctx: ctx,
stop: make(chan struct{}),
beaconProvider: cfg.BeaconProvider,
beaconCert: cfg.BeaconCert,
}
if err := s.startDB(s.ctx); err != nil {
return nil, err
}
s.slasher = &rpc.Server{
SlasherDB: s.slasherDb,
}
return s, nil
}
func (s *Service) startDB(ctx *cli.Context) error {
baseDir := ctx.GlobalString(cmd.DataDirFlag.Name)
dbPath := path.Join(baseDir, slasherDBName)
cfg := &kv.Config{SpanCacheEnabled: ctx.GlobalBool(flags.UseSpanCacheFlag.Name)}
slasherDB, err := db.NewDB(dbPath, cfg)
if err != nil {
return err
}
if s.ctx.GlobalBool(cmd.ClearDB.Name) {
if err := slasherDB.ClearDB(); err != nil {
return err
}
slasherDB, err = db.NewDB(dbPath, cfg)
if err != nil {
return err
}
}
log.WithField("path", dbPath).Info("Checking db")
s.slasherDb = slasherDB
return nil
}
// Start the gRPC server.
func (s *Service) Start() {
s.lock.Lock()
log.WithFields(logrus.Fields{
"version": version.GetVersion(),
}).Info("Starting hash slinging slasher node")
s.context = context.Background()
s.startSlasher()
if s.beaconClient == nil {
if err := s.startBeaconClient(); err != nil {
log.WithError(err).Errorf("failed to start beacon client")
s.failStatus = err
return
}
}
stop := s.stop
if err := s.historicalAttestationFeeder(s.context); err != nil {
err = errors.Wrap(err, "couldn't start attestation feeder from archive endpoint. please use "+
"--beacon-rpc-provider flag value if you are not running a beacon chain service with "+
"--archive flag on the local machine.")
log.Error(err)
s.failStatus = err
return
}
go func() {
if err := s.attestationFeeder(s.context); err != nil {
log.Error(err)
}
}()
go func() {
if err := s.finalizedChangeUpdater(s.context); err != nil {
log.Error(err)
}
}()
s.lock.Unlock()
go func() {
sigc := make(chan os.Signal, 1)
signal.Notify(sigc, syscall.SIGINT, syscall.SIGTERM)
defer signal.Stop(sigc)
<-sigc
log.Info("Got interrupt, shutting down...")
debug.Exit(s.ctx) // Ensure trace and CPU profile data are flushed.
go s.Close()
for i := 10; i > 0; i-- {
<-sigc
if i > 1 {
log.Info("Already shutting down, interrupt more to panic", "times", i-1)
}
}
panic("Panic closing the hash slinging slasher node")
}()
s.started = true
// Wait for stop channel to be closed.
<-stop
}
func (s *Service) startSlasher() {
log.Info("Starting service on port: ", s.port)
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", s.port))
if err != nil {
log.Errorf("Could not listen to port in Start() :%d: %v", s.port, err)
}
s.listener = lis
log.WithField("port", s.port).Info("Listening on port")
opts := []grpc.ServerOption{
grpc.StatsHandler(&ocgrpc.ServerHandler{}),
grpc.StreamInterceptor(middleware.ChainStreamServer(
recovery.StreamServerInterceptor(),
grpc_prometheus.StreamServerInterceptor,
)),
grpc.UnaryInterceptor(middleware.ChainUnaryServer(
recovery.UnaryServerInterceptor(),
grpc_prometheus.UnaryServerInterceptor,
)),
}
// TODO(#791): Utilize a certificate for secure connections
// between beacon nodes and validator clients.
if s.withCert != "" && s.withKey != "" {
creds, err := credentials.NewServerTLSFromFile(s.withCert, s.withKey)
if err != nil {
log.Errorf("Could not load TLS keys: %s", err)
s.credentialError = err
}
opts = append(opts, grpc.Creds(creds))
} else {
log.Warn("You are using an insecure gRPC connection! Provide a certificate and key to connect securely")
}
s.grpcServer = grpc.NewServer(opts...)
slasherServer := rpc.Server{
SlasherDB: s.slasherDb,
}
if s.ctx.GlobalBool(flags.RebuildSpanMapsFlag.Name) {
s.loadSpanMaps(slasherServer)
}
slashpb.RegisterSlasherServer(s.grpcServer, &slasherServer)
// Register reflection service on gRPC server.
reflection.Register(s.grpcServer)
go func() {
if s.listener != nil {
if err := s.grpcServer.Serve(s.listener); err != nil {
log.Errorf("Could not serve gRPC: %v", err)
}
}
}()
}
func (s *Service) startBeaconClient() error {
var dialOpt grpc.DialOption
if s.beaconCert != "" {
creds, err := credentials.NewClientTLSFromFile(s.beaconCert, "")
if err != nil {
log.Errorf("Could not get valid credentials: %v", err)
}
dialOpt = grpc.WithTransportCredentials(creds)
} else {
dialOpt = grpc.WithInsecure()
log.Warn("You are using an insecure gRPC connection to beacon chain! Please provide a certificate and key to use a secure connection.")
}
beaconOpts := []grpc.DialOption{
dialOpt,
grpc.WithStatsHandler(&ocgrpc.ClientHandler{}),
grpc.WithStreamInterceptor(middleware.ChainStreamClient(
grpc_opentracing.StreamClientInterceptor(),
grpc_prometheus.StreamClientInterceptor,
)),
grpc.WithUnaryInterceptor(middleware.ChainUnaryClient(
grpc_opentracing.UnaryClientInterceptor(),
grpc_prometheus.UnaryClientInterceptor,
)),
}
conn, err := grpc.DialContext(s.context, s.beaconProvider, beaconOpts...)
if err != nil {
return fmt.Errorf("could not dial endpoint: %s, %v", s.beaconProvider, err)
}
log.Info("Successfully started gRPC connection")
s.beaconConn = conn
s.beaconClient = eth.NewBeaconChainClient(s.beaconConn)
return nil
}
func (s *Service) loadSpanMaps(slasherServer rpc.Server) {
latestTargetEpoch, err := slasherServer.SlasherDB.LatestIndexedAttestationsTargetEpoch(s.context)
if err != nil {
log.Errorf("Could not extract latest target epoch from indexed attestations store: %v", err)
}
for epoch := uint64(0); epoch < latestTargetEpoch; epoch++ {
idxAtts, err := slasherServer.SlasherDB.IdxAttsForTarget(s.context, epoch)
if err != nil {
log.Errorf("Got error while trying to retrieve indexed attestations from db: %v", err)
}
for _, ia := range idxAtts {
if err := slasherServer.UpdateSpanMaps(s.context, ia); err != nil {
log.Errorf("Unexpected error updating span maps: %v", err)
}
}
log.Infof("Update span maps for epoch: %d", epoch)
}
}
// Stop the service.
func (s *Service) Stop() error {
log.Info("Stopping service")
if s.slasherDb != nil {
if err := s.slasherDb.Close(); err != nil {
return err
}
}
if s.listener != nil {
s.grpcServer.GracefulStop()
log.Debug("Initiated graceful stop of gRPC server")
}
return nil
}
// Close handles graceful shutdown of the system.
func (s *Service) Close() {
s.lock.Lock()
defer s.lock.Unlock()
log.Info("Stopping hash slinging slasher")
if err := s.Stop(); err != nil {
log.Panicf("Could not stop the slasher service: %v", err)
}
if err := s.slasherDb.SaveCachedSpansMaps(s.context); err != nil {
log.Fatal("Didn't save span map cache to db. if span cache is enabled please restart with --%s", flags.RebuildSpanMapsFlag.Name)
}
if err := s.slasherDb.Close(); err != nil {
log.Errorf("Failed to close slasher database: %v", err)
}
s.context.Done()
close(s.stop)
}
// Status returns nil, credentialError or fail status.
func (s *Service) Status() (bool, error) {
if s.credentialError != nil {
return false, s.credentialError
}
if s.failStatus != nil {
return false, s.failStatus
}
return s.started, nil
}