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endpoint_reader.go
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endpoint_reader.go
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package remote
import (
"errors"
"io"
"log/slog"
"google.golang.org/protobuf/proto"
"github.com/keecon/protoactor-go/actor"
"golang.org/x/net/context"
)
type endpointReader struct {
suspended bool
remote *Remote
}
func (s *endpointReader) mustEmbedUnimplementedRemotingServer() {
// TODO implement me
panic("implement me")
}
func (s *endpointReader) ListProcesses(ctx context.Context, request *ListProcessesRequest) (*ListProcessesResponse, error) {
panic("implement me")
}
func (s *endpointReader) GetProcessDiagnostics(ctx context.Context, request *GetProcessDiagnosticsRequest) (*GetProcessDiagnosticsResponse, error) {
panic("implement me")
}
func newEndpointReader(r *Remote) *endpointReader {
return &endpointReader{
remote: r,
}
}
func (s *endpointReader) Receive(stream Remoting_ReceiveServer) error {
disconnectChan := make(chan bool, 1)
s.remote.edpManager.endpointReaderConnections.Store(stream, disconnectChan)
defer func() {
close(disconnectChan)
}()
go func() {
// endpointManager sends true
// endpointReader sends false
if <-disconnectChan {
s.remote.Logger().Debug("EndpointReader is telling to remote that it's leaving")
err := stream.Send(&RemoteMessage{
MessageType: &RemoteMessage_DisconnectRequest{
DisconnectRequest: &DisconnectRequest{},
},
})
if err != nil {
s.remote.Logger().Error("EndpointReader failed to send disconnection message", slog.Any("error", err))
}
} else {
s.remote.edpManager.endpointReaderConnections.Delete(stream)
s.remote.Logger().Debug("EndpointReader removed active endpoint from endpointManager")
}
}()
for {
msg, err := stream.Recv()
switch {
case errors.Is(err, io.EOF):
s.remote.Logger().Info("EndpointReader stream closed")
disconnectChan <- false
return nil
case err != nil:
s.remote.Logger().Info("EndpointReader failed to read", slog.Any("error", err))
return err
case s.suspended:
continue
}
switch t := msg.MessageType.(type) {
case *RemoteMessage_ConnectRequest:
s.remote.Logger().Debug("EndpointReader received connect request", slog.Any("message", t.ConnectRequest))
c := t.ConnectRequest
_, err := s.OnConnectRequest(stream, c)
if err != nil {
s.remote.Logger().Error("EndpointReader failed to handle connect request", slog.Any("error", err))
return err
}
case *RemoteMessage_MessageBatch:
m := t.MessageBatch
err := s.onMessageBatch(m)
if err != nil {
return err
}
default:
{
s.remote.Logger().Warn("EndpointReader received unknown message type")
}
}
}
}
func (s *endpointReader) OnConnectRequest(stream Remoting_ReceiveServer, c *ConnectRequest) (bool, error) {
switch tt := c.ConnectionType.(type) {
case *ConnectRequest_ServerConnection:
{
sc := tt.ServerConnection
s.onServerConnection(stream, sc)
}
case *ConnectRequest_ClientConnection:
{
// TODO implement me
s.remote.Logger().Error("ClientConnection not implemented")
}
default:
s.remote.Logger().Error("EndpointReader received unknown connection type")
return true, nil
}
return false, nil
}
func (s *endpointReader) onMessageBatch(m *MessageBatch) error {
var (
sender *actor.PID
target *actor.PID
)
for _, envelope := range m.Envelopes {
data := envelope.MessageData
sender = deserializeSender(sender, envelope.Sender, envelope.SenderRequestId, m.Senders)
target = deserializeTarget(target, envelope.Target, envelope.TargetRequestId, m.Targets)
if target == nil {
s.remote.Logger().Error("EndpointReader received message with unknown target", slog.Int("target", int(envelope.Target)), slog.Int("targetRequestId", int(envelope.TargetRequestId)))
return errors.New("unknown target")
}
message, err := Deserialize(data, m.TypeNames[envelope.TypeId], envelope.SerializerId)
if err != nil {
s.remote.Logger().Error("EndpointReader failed to deserialize", slog.Any("error", err))
return err
}
// translate from on-the-wire representation to in-process representation
// this only applies to root level messages, and never on nested child messages
if v, ok := message.(RootSerialized); ok {
message = v.Deserialize()
}
switch msg := message.(type) {
case *actor.Terminated:
rt := &remoteTerminate{
Watchee: msg.Who,
Watcher: target,
}
s.remote.edpManager.remoteTerminate(rt)
case actor.SystemMessage:
ref, _ := s.remote.actorSystem.ProcessRegistry.GetLocal(target.Id)
ref.SendSystemMessage(target, msg)
default:
var header map[string]string
// fast path
if sender == nil && envelope.MessageHeader == nil {
s.remote.actorSystem.Root.Send(target, message)
continue
}
// slow path
if envelope.MessageHeader != nil {
header = envelope.MessageHeader.HeaderData
}
localEnvelope := &actor.MessageEnvelope{
Header: header,
Message: message,
Sender: sender,
}
s.remote.actorSystem.Root.Send(target, localEnvelope)
}
}
return nil
}
func deserializeSender(pid *actor.PID, index int32, requestId uint32, arr []*actor.PID) *actor.PID {
if index == 0 {
pid = nil
} else {
pid = arr[index-1]
// if request id is used. make sure to clone the PID first, so we don't corrupt the lookup
if requestId > 0 {
pid, _ = proto.Clone(pid).(*actor.PID)
pid.RequestId = requestId
}
}
return pid
}
func deserializeTarget(pid *actor.PID, index int32, requestId uint32, arr []*actor.PID) *actor.PID {
pid = arr[index]
// if request id is used. make sure to clone the PID first, so we don't corrupt the lookup
if requestId > 0 {
pid, _ = proto.Clone(pid).(*actor.PID)
pid.RequestId = requestId
}
return pid
}
func (s *endpointReader) onServerConnection(stream Remoting_ReceiveServer, sc *ServerConnection) {
if s.remote.BlockList().IsBlocked(sc.SystemId) {
s.remote.Logger().Debug("EndpointReader is blocked")
err := stream.Send(
&RemoteMessage{
MessageType: &RemoteMessage_ConnectResponse{
ConnectResponse: &ConnectResponse{
Blocked: true,
MemberId: s.remote.actorSystem.ID,
},
},
})
if err != nil {
s.remote.Logger().Error("EndpointReader failed to send ConnectResponse message", slog.Any("error", err))
}
address := sc.Address
systemID := sc.SystemId
// TODO
_ = address
_ = systemID
} else {
err := stream.Send(
&RemoteMessage{
MessageType: &RemoteMessage_ConnectResponse{
ConnectResponse: &ConnectResponse{
Blocked: false,
MemberId: s.remote.actorSystem.ID,
},
},
})
if err != nil {
s.remote.Logger().Error("EndpointReader failed to send ConnectResponse message", slog.Any("error", err))
}
}
}
func (s *endpointReader) suspend(toSuspend bool) {
s.suspended = toSuspend
if toSuspend {
s.remote.Logger().Debug("Suspended EndpointReader")
}
}