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server.go
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server.go
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package shrexnd
import (
"context"
"encoding/hex"
"errors"
"fmt"
"time"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/protocol"
"github.com/minio/sha256-simd"
"go.uber.org/zap"
"github.com/celestiaorg/go-libp2p-messenger/serde"
"github.com/celestiaorg/celestia-node/share"
"github.com/celestiaorg/celestia-node/share/eds"
"github.com/celestiaorg/celestia-node/share/ipld"
"github.com/celestiaorg/celestia-node/share/p2p"
pb "github.com/celestiaorg/celestia-node/share/p2p/shrexnd/pb"
)
// Server implements server side of shrex/nd protocol to serve namespaced share to remote
// peers.
type Server struct {
cancel context.CancelFunc
host host.Host
protocolID protocol.ID
getter share.Getter
store *eds.Store
params *Parameters
middleware *p2p.Middleware
metrics *p2p.Metrics
}
// NewServer creates new Server
func NewServer(params *Parameters, host host.Host, store *eds.Store, getter share.Getter) (*Server, error) {
if err := params.Validate(); err != nil {
return nil, fmt.Errorf("shrex-nd: server creation failed: %w", err)
}
srv := &Server{
getter: getter,
store: store,
host: host,
params: params,
protocolID: p2p.ProtocolID(params.NetworkID(), protocolString),
middleware: p2p.NewMiddleware(params.ConcurrencyLimit),
}
return srv, nil
}
// Start starts the server
func (srv *Server) Start(context.Context) error {
ctx, cancel := context.WithCancel(context.Background())
srv.cancel = cancel
handler := func(s network.Stream) {
srv.handleNamespacedData(ctx, s)
}
srv.host.SetStreamHandler(srv.protocolID, srv.middleware.RateLimitHandler(handler))
return nil
}
// Stop stops the server
func (srv *Server) Stop(context.Context) error {
srv.cancel()
srv.host.RemoveStreamHandler(srv.protocolID)
return nil
}
func (srv *Server) observeRateLimitedRequests() {
numRateLimited := srv.middleware.DrainCounter()
if numRateLimited > 0 {
srv.metrics.ObserveRequests(context.Background(), numRateLimited, p2p.StatusRateLimited)
}
}
func (srv *Server) handleNamespacedData(ctx context.Context, stream network.Stream) {
logger := log.With("peer", stream.Conn().RemotePeer().String())
logger.Debug("server: handling nd request")
srv.observeRateLimitedRequests()
err := stream.SetReadDeadline(time.Now().Add(srv.params.ServerReadTimeout))
if err != nil {
logger.Debugw("server: setting read deadline", "err", err)
}
var req pb.GetSharesByNamespaceRequest
_, err = serde.Read(stream, &req)
if err != nil {
logger.Warnw("server: reading request", "err", err)
stream.Reset() //nolint:errcheck
return
}
logger = logger.With("namespaceId", hex.EncodeToString(req.NamespaceId), "hash", share.DataHash(req.RootHash).String())
logger.Debugw("server: new request")
err = stream.CloseRead()
if err != nil {
logger.Debugw("server: closing read side of the stream", "err", err)
}
err = validateRequest(req)
if err != nil {
logger.Warnw("server: invalid request", "err", err)
stream.Reset() //nolint:errcheck
return
}
ctx, cancel := context.WithTimeout(ctx, srv.params.HandleRequestTimeout)
defer cancel()
dah, err := srv.store.GetDAH(ctx, req.RootHash)
if err != nil {
if errors.Is(err, eds.ErrNotFound) {
logger.Warn("server: DAH not found")
srv.respondNotFoundError(ctx, logger, stream)
return
}
logger.Errorw("server: retrieving DAH", "err", err)
srv.respondInternalError(ctx, logger, stream)
return
}
shares, err := srv.getter.GetSharesByNamespace(ctx, dah, req.NamespaceId)
switch {
case errors.Is(err, share.ErrNotFound):
logger.Warn("server: nd not found")
srv.respondNotFoundError(ctx, logger, stream)
return
case errors.Is(err, share.ErrNamespaceNotFound):
srv.respondNamespaceNotFoundError(ctx, logger, stream)
return
case err != nil:
logger.Errorw("server: retrieving shares", "err", err)
srv.respondInternalError(ctx, logger, stream)
return
}
resp := namespacedSharesToResponse(shares)
srv.respond(ctx, logger, stream, resp)
}
// validateRequest checks correctness of the request
func validateRequest(req pb.GetSharesByNamespaceRequest) error {
if len(req.NamespaceId) != ipld.NamespaceSize {
return fmt.Errorf("incorrect namespace id length: %v", len(req.NamespaceId))
}
if len(req.RootHash) != sha256.Size {
return fmt.Errorf("incorrect root hash length: %v", len(req.RootHash))
}
return nil
}
// respondNotFoundError sends a not found response to client
func (srv *Server) respondNotFoundError(ctx context.Context,
logger *zap.SugaredLogger, stream network.Stream) {
resp := &pb.GetSharesByNamespaceResponse{
Status: pb.StatusCode_NOT_FOUND,
}
srv.respond(ctx, logger, stream, resp)
}
// respondNamespaceNotFoundError sends a namespace not found response to client
func (srv *Server) respondNamespaceNotFoundError(ctx context.Context,
logger *zap.SugaredLogger, stream network.Stream) {
resp := &pb.GetSharesByNamespaceResponse{
Status: pb.StatusCode_NAMESPACE_NOT_FOUND,
}
srv.respond(ctx, logger, stream, resp)
}
// respondInternalError sends internal error response to client
func (srv *Server) respondInternalError(ctx context.Context,
logger *zap.SugaredLogger, stream network.Stream) {
resp := &pb.GetSharesByNamespaceResponse{
Status: pb.StatusCode_INTERNAL,
}
srv.respond(ctx, logger, stream, resp)
}
// namespacedSharesToResponse encodes shares into proto and sends it to client with OK status code
func namespacedSharesToResponse(shares share.NamespacedShares) *pb.GetSharesByNamespaceResponse {
rows := make([]*pb.Row, 0, len(shares))
for _, row := range shares {
proof := &pb.Proof{
Start: int64(row.Proof.Start()),
End: int64(row.Proof.End()),
Nodes: row.Proof.Nodes(),
}
row := &pb.Row{
Shares: row.Shares,
Proof: proof,
}
rows = append(rows, row)
}
return &pb.GetSharesByNamespaceResponse{
Status: pb.StatusCode_OK,
Rows: rows,
}
}
func (srv *Server) respond(ctx context.Context,
logger *zap.SugaredLogger, stream network.Stream, resp *pb.GetSharesByNamespaceResponse) {
err := stream.SetWriteDeadline(time.Now().Add(srv.params.ServerWriteTimeout))
if err != nil {
logger.Debugw("server: setting write deadline", "err", err)
}
_, err = serde.Write(stream, resp)
if err != nil {
logger.Warnw("server: writing response", "err", err)
stream.Reset() //nolint:errcheck
return
}
switch {
case resp.Status == pb.StatusCode_OK:
srv.metrics.ObserveRequests(ctx, 1, p2p.StatusSuccess)
case resp.Status == pb.StatusCode_NOT_FOUND:
srv.metrics.ObserveRequests(ctx, 1, p2p.StatusNotFound)
case resp.Status == pb.StatusCode_INTERNAL:
srv.metrics.ObserveRequests(ctx, 1, p2p.StatusInternalErr)
}
if err = stream.Close(); err != nil {
logger.Debugw("server: closing stream", "err", err)
}
}