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socket_client.go
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socket_client.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package broker
import (
"context"
"fmt"
"net"
"strings"
"sync"
"time"
"code.vegaprotocol.io/vega/core/events"
"code.vegaprotocol.io/vega/libs/proto"
"code.vegaprotocol.io/vega/logging"
eventspb "code.vegaprotocol.io/vega/protos/vega/events/v1"
"go.nanomsg.org/mangos/v3"
mangosErr "go.nanomsg.org/mangos/v3/errors"
"go.nanomsg.org/mangos/v3/protocol"
"go.nanomsg.org/mangos/v3/protocol/pair"
"golang.org/x/sync/errgroup"
_ "go.nanomsg.org/mangos/v3/transport/inproc" // Does some nanomsg magic presumably
_ "go.nanomsg.org/mangos/v3/transport/tcp" // Does some nanomsg magic presumably
)
// SocketClient stream events sent to this broker over a socket to a remote broker.
// This is used to send events from a non-validating core node to a data node.
type socketClient struct {
log *logging.Logger
config *SocketConfig
sock protocol.Socket
eventsCh chan events.Event
closed bool
mut sync.RWMutex
}
func pipeEventToString(pe mangos.PipeEvent) string {
switch pe {
case mangos.PipeEventAttached:
return "Attached"
case mangos.PipeEventDetached:
return "Detached"
default:
return "Attaching"
}
}
const namedSocketClientLogger = "socket-client"
func newSocketClient(ctx context.Context, log *logging.Logger, config *SocketConfig) (*socketClient, error) {
log = log.Named(namedSocketClientLogger)
sock, err := pair.NewSocket()
if err != nil {
return nil, fmt.Errorf("failed to create new push socket: %w", err)
}
socOpts := map[string]interface{}{
mangos.OptionWriteQLen: config.SocketChannelBufferSize,
mangos.OptionSendDeadline: config.SocketQueueTimeout.Duration,
}
for name, value := range socOpts {
if err := sock.SetOption(name, value); err != nil {
return nil, fmt.Errorf("failed to set option: %w", err)
}
}
sock.SetPipeEventHook(func(pe mangos.PipeEvent, p mangos.Pipe) {
log.Info(
"New broker connection event",
logging.String("eventType", pipeEventToString(pe)),
logging.Uint32("id", p.ID()),
logging.String("address", p.Address()),
)
})
s := &socketClient{
log: log,
config: config,
sock: sock,
eventsCh: make(chan events.Event, config.EventChannelBufferSize),
}
if err := s.connect(ctx); err != nil {
return nil, fmt.Errorf("failed to connect: %w", err)
}
go func() {
if err := s.stream(ctx); err != nil {
s.log.Fatal("socket streaming has failed", logging.Error(err))
}
}()
return s, nil
}
func (s *socketClient) SendBatch(evts []events.Event) error {
for _, evt := range evts {
if err := s.Send(evt); err != nil {
return err
}
}
return nil
}
// Send sends events on the events queue.
// Panics if socket is closed or is not streaming.
// Returns an error if events queue is full.
func (s *socketClient) Send(evt events.Event) error {
s.mut.RLock()
defer s.mut.RUnlock()
if s.closed {
s.log.Panic("Failed to send event - socket is closed closed socket")
}
select {
case s.eventsCh <- evt:
break
case <-time.After(2 * time.Second):
default:
return fmt.Errorf("event queue is full")
}
return nil
}
func (s *socketClient) close() {
s.mut.Lock()
defer s.mut.Unlock()
s.closed = true
close(s.eventsCh)
if err := s.sock.Close(); err != nil {
s.log.Error("failed to close socket", logging.Error(err))
}
}
func (s *socketClient) getDialAddr() string {
return fmt.Sprintf(
"%s://%s",
strings.ToLower(s.config.Transport),
net.JoinHostPort(s.config.Address, fmt.Sprintf("%d", s.config.Port)),
)
}
func (s *socketClient) connect(ctx context.Context) error {
ticker := time.NewTicker(s.config.DialRetryInterval.Get())
defer ticker.Stop()
ctx, cancel := context.WithTimeout(ctx, s.config.DialTimeout.Get())
defer cancel()
addr := s.getDialAddr()
for {
err := s.sock.Dial(addr)
if err == nil {
return nil
}
s.log.Error("failed to connect, retrying", logging.Error(err), logging.String("peer", addr))
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
}
}
}
func (s *socketClient) stream(ctx context.Context) error {
s.mut.RLock()
if s.closed {
s.mut.RUnlock()
return fmt.Errorf("socket is closed")
}
s.mut.RUnlock()
defer s.close()
for {
select {
case <-ctx.Done():
return nil
case evt := <-s.eventsCh:
msg, err := proto.Marshal(evt.StreamMessage())
if err != nil {
s.log.Error("Failed to marshal event", logging.Error(err))
continue
}
err = s.sock.Send(msg)
if err != nil {
switch err {
case protocol.ErrClosed:
return fmt.Errorf("socket is closed: %w", err)
case protocol.ErrSendTimeout:
return fmt.Errorf("failed to queue message on socket: %w", err)
default:
s.log.Error("Failed to send to socket", logging.Error(err))
}
continue
}
}
}
}
func (s *socketClient) Receive(ctx context.Context) (<-chan events.Event, <-chan error) {
// channel onto which we push the raw messages from the queue
inboundCh := make(chan []byte, 10)
stopCh := make(chan struct{}, 1)
outboundCh := make(chan events.Event, 10)
errCh := make(chan error, 1)
eg, ctx := errgroup.WithContext(ctx)
eg.Go(func() error {
<-ctx.Done()
return nil
})
eg.Go(func() error {
defer close(outboundCh)
for msg := range inboundCh {
var be eventspb.BusEvent
if err := proto.Unmarshal(msg, &be); err != nil {
// surely we should stop if this happens?
s.log.Error("Failed to unmarshal received event", logging.Error(err))
continue
}
if be.Version != eventspb.Version {
return fmt.Errorf("mismatched BusEvent version received: %d, want %d", be.Version, eventspb.Version)
}
evt := toEvent(ctx, &be)
if evt == nil {
s.log.Error("Cannot convert proto event to internal event", logging.String("event_type", be.GetType().String()))
continue
}
// Listen for context cancels, even if we're blocked sending events
select {
case outboundCh <- evt:
case <-ctx.Done():
return ctx.Err()
}
}
return nil
})
eg.Go(func() error {
defer close(inboundCh)
s.sock.SetOption(mangos.OptionRecvDeadline, 1*time.Second)
for {
msg, err := s.sock.Recv()
if err != nil {
switch err {
case mangosErr.ErrRecvTimeout:
select {
case <-stopCh:
return nil
default:
}
case mangosErr.ErrBadVersion:
return fmt.Errorf("failed with bad protocol version: %w", err)
case mangosErr.ErrClosed:
return nil
default:
s.log.Error("Failed to Receive message", logging.Error(err))
continue
}
}
if len(msg) == 0 {
continue
}
inboundCh <- msg
}
})
go func() {
defer func() {
close(errCh)
}()
if err := eg.Wait(); err != nil {
errCh <- err
}
}()
return outboundCh, errCh
}