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client.go
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client.go
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package shrexnd
import (
"context"
"errors"
"fmt"
"io"
"net"
"time"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/protocol"
"github.com/furyaxyz/go-libp2p-messenger/serde"
"github.com/furyaxyz/nmt"
"github.com/furyaxyz/nmt/namespace"
"github.com/furyaxyz/elysium-node/share"
"github.com/furyaxyz/elysium-node/share/ipld"
"github.com/furyaxyz/elysium-node/share/p2p"
pb "github.com/furyaxyz/elysium-node/share/p2p/shrexnd/pb"
)
// Client implements client side of shrex/nd protocol to obtain namespaced shares data from remote
// peers.
type Client struct {
params *Parameters
protocolID protocol.ID
host host.Host
metrics *p2p.Metrics
}
// NewClient creates a new shrEx/nd client
func NewClient(params *Parameters, host host.Host) (*Client, error) {
if err := params.Validate(); err != nil {
return nil, fmt.Errorf("shrex-nd: client creation failed: %w", err)
}
return &Client{
host: host,
protocolID: p2p.ProtocolID(params.NetworkID(), protocolString),
params: params,
}, nil
}
// RequestND requests namespaced data from the given peer.
// Returns valid data with its verified inclusion against the share.Root.
func (c *Client) RequestND(
ctx context.Context,
root *share.Root,
nID namespace.ID,
peer peer.ID,
) (share.NamespacedShares, error) {
shares, err := c.doRequest(ctx, root, nID, peer)
if err == nil {
return shares, err
}
if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
c.metrics.ObserveRequests(ctx, 1, p2p.StatusTimeout)
return nil, err
}
// some net.Errors also mean the context deadline was exceeded, but yamux/mocknet do not
// unwrap to a ctx err
var ne net.Error
if errors.As(err, &ne) && ne.Timeout() {
if deadline, _ := ctx.Deadline(); deadline.Before(time.Now()) {
c.metrics.ObserveRequests(ctx, 1, p2p.StatusTimeout)
return nil, context.DeadlineExceeded
}
}
if err != p2p.ErrNotFound {
log.Warnw("client-nd: peer returned err", "err", err)
}
return nil, err
}
func (c *Client) doRequest(
ctx context.Context,
root *share.Root,
nID namespace.ID,
peerID peer.ID,
) (share.NamespacedShares, error) {
stream, err := c.host.NewStream(ctx, peerID, c.protocolID)
if err != nil {
return nil, err
}
defer stream.Close()
c.setStreamDeadlines(ctx, stream)
req := &pb.GetSharesByNamespaceRequest{
RootHash: root.Hash(),
NamespaceId: nID,
}
_, err = serde.Write(stream, req)
if err != nil {
stream.Reset() //nolint:errcheck
return nil, fmt.Errorf("client-nd: writing request: %w", err)
}
err = stream.CloseWrite()
if err != nil {
log.Debugw("client-nd: closing write side of the stream", "err", err)
}
var resp pb.GetSharesByNamespaceResponse
_, err = serde.Read(stream, &resp)
if err != nil {
// server is overloaded and closed the stream
if errors.Is(err, io.EOF) {
c.metrics.ObserveRequests(ctx, 1, p2p.StatusRateLimited)
return nil, p2p.ErrNotFound
}
stream.Reset() //nolint:errcheck
return nil, fmt.Errorf("client-nd: reading response: %w", err)
}
if err = c.statusToErr(ctx, resp.Status); err != nil {
return nil, fmt.Errorf("client-nd: response code is not OK: %w", err)
}
shares, err := convertToNamespacedShares(resp.Rows)
if err != nil {
return nil, fmt.Errorf("client-nd: converting response to shares: %w", err)
}
err = shares.Verify(root, nID)
if err != nil {
return nil, fmt.Errorf("client-nd: verifying response: %w", err)
}
return shares, nil
}
// convertToNamespacedShares converts proto Rows to share.NamespacedShares
func convertToNamespacedShares(rows []*pb.Row) (share.NamespacedShares, error) {
shares := make([]share.NamespacedRow, 0, len(rows))
for _, row := range rows {
var proof *nmt.Proof
if row.Proof != nil {
tmpProof := nmt.NewInclusionProof(
int(row.Proof.Start),
int(row.Proof.End),
row.Proof.Nodes,
ipld.NMTIgnoreMaxNamespace,
)
proof = &tmpProof
}
shares = append(shares, share.NamespacedRow{
Shares: row.Shares,
Proof: proof,
})
}
return shares, nil
}
func (c *Client) setStreamDeadlines(ctx context.Context, stream network.Stream) {
// set read/write deadline to use context deadline if it exists
deadline, ok := ctx.Deadline()
if ok {
err := stream.SetDeadline(deadline)
if err == nil {
return
}
log.Debugw("client-nd: set stream deadline", "err", err)
}
// if deadline not set, client read deadline defaults to server write deadline
if c.params.ServerWriteTimeout != 0 {
err := stream.SetReadDeadline(time.Now().Add(c.params.ServerWriteTimeout))
if err != nil {
log.Debugw("client-nd: set read deadline", "err", err)
}
}
// if deadline not set, client write deadline defaults to server read deadline
if c.params.ServerReadTimeout != 0 {
err := stream.SetWriteDeadline(time.Now().Add(c.params.ServerReadTimeout))
if err != nil {
log.Debugw("client-nd: set write deadline", "err", err)
}
}
}
func (c *Client) statusToErr(ctx context.Context, code pb.StatusCode) error {
switch code {
case pb.StatusCode_OK:
c.metrics.ObserveRequests(ctx, 1, p2p.StatusSuccess)
return nil
case pb.StatusCode_NOT_FOUND:
c.metrics.ObserveRequests(ctx, 1, p2p.StatusNotFound)
return p2p.ErrNotFound
case pb.StatusCode_INVALID:
log.Debug("client-nd: invalid request")
fallthrough
case pb.StatusCode_INTERNAL:
fallthrough
default:
return p2p.ErrInvalidResponse
}
}