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server_socket.go
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server_socket.go
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package sio
import (
"fmt"
"reflect"
"time"
"github.com/karagenc/socket.io-go/internal/sync"
"github.com/karagenc/socket.io-go/internal/utils"
mapset "github.com/deckarep/golang-set/v2"
"github.com/karagenc/socket.io-go/adapter"
eio "github.com/karagenc/socket.io-go/engine.io"
"github.com/karagenc/socket.io-go/parser"
)
type serverSocket struct {
id SocketID
pid adapter.PrivateSessionID
recovered bool
// `connected` means "did we receive the CONNECT packet?"
connected bool
connectedMu sync.RWMutex
server *Server
conn *serverConn
nsp *Namespace
adapter adapter.Adapter
parser parser.Parser
acks map[uint64]*ackHandler
acksMu sync.Mutex
middlewareFuncs []reflect.Value
middlewareFuncsMu sync.RWMutex
join func(room ...Room)
joinMu sync.Mutex
closeOnce sync.Once
debug Debugger
eventHandlers *eventHandlerStore
errorHandlers *handlerStore[*ServerSocketErrorFunc]
disconnectingHandlers *handlerStore[*ServerSocketDisconnectingFunc]
disconnectHandlers *handlerStore[*ServerSocketDisconnectFunc]
}
// previousSession can be nil
func newServerSocket(
server *Server,
c *serverConn,
nsp *Namespace,
parser parser.Parser,
previousSession *adapter.SessionToPersist,
) (*serverSocket, error) {
_adapter := nsp.Adapter()
s := &serverSocket{
server: server,
conn: c,
nsp: nsp,
adapter: _adapter,
parser: parser,
acks: make(map[uint64]*ackHandler),
debug: server.debug.WithContext("[sio/server] Socket (nsp: `" + nsp.Name() + "`)"),
eventHandlers: newEventHandlerStore(),
errorHandlers: newHandlerStore[*ServerSocketErrorFunc](),
disconnectingHandlers: newHandlerStore[*ServerSocketDisconnectingFunc](),
disconnectHandlers: newHandlerStore[*ServerSocketDisconnectFunc](),
}
s.join = func(room ...Room) {
s.debug.Log("Joining room(s)", room)
_adapter.AddAll(s.ID(), room)
}
if previousSession != nil {
s.id = previousSession.SID
s.pid = previousSession.PID
s.recovered = true
s.Join(previousSession.Rooms...)
for _, missedPacket := range previousSession.MissedPackets {
buffers, err := s.parser.Encode(missedPacket.Header, &missedPacket.Data)
if err != nil {
return nil, err
}
s.conn.sendBuffers(buffers...)
}
} else {
id, err := eio.GenerateBase64ID(eio.Base64IDSize)
if err != nil {
return nil, err
}
s.id = SocketID(id)
s.recovered = false
if server.connectionStateRecovery.Enabled {
id, err := eio.GenerateBase64ID(eio.Base64IDSize)
if err != nil {
return nil, err
}
s.pid = adapter.PrivateSessionID(id)
}
}
nsp.debug.Log("New socket! ID", s.id)
return s, nil
}
func (s *serverSocket) Server() *Server { return s.server }
func (s *serverSocket) Namespace() *Namespace { return s.nsp }
func (s *serverSocket) Recovered() bool { return s.recovered }
func (s *serverSocket) Connected() bool {
s.connectedMu.RLock()
defer s.connectedMu.RUnlock()
return s.connected
}
func (s *serverSocket) onPacket(header *parser.PacketHeader, eventName string, decode parser.Decode) error {
switch header.Type {
case parser.PacketTypeEvent, parser.PacketTypeBinaryEvent:
var (
mu sync.Mutex
sent bool
)
sendAck := func(ackID uint64, values []reflect.Value) {
mu.Lock()
if sent {
mu.Unlock()
return
}
sent = true
mu.Unlock()
s.debug.Log("Sending ack with ID", ackID)
s.sendAckPacket(ackID, values)
}
for _, handler := range s.eventHandlers.getAll(eventName) {
s.onEvent(handler, header, decode, sendAck)
}
case parser.PacketTypeAck, parser.PacketTypeBinaryAck:
s.onAck(header, decode)
case parser.PacketTypeDisconnect:
s.onDisconnect()
default:
return wrapInternalError(fmt.Errorf("invalid packet type: %d", header.Type))
}
return nil
}
func (s *serverSocket) onDisconnect() {
s.debug.Log("Got disconnect packet")
s.onClose(ReasonClientNamespaceDisconnect)
}
func (s *serverSocket) onEvent(
handler *eventHandler,
header *parser.PacketHeader,
decode parser.Decode,
sendAck ackSendFunc,
) (hasAckFunc bool) {
values, err := decode(handler.inputArgs...)
if err != nil {
s.onError(wrapInternalError(err))
return
}
if len(values) == len(handler.inputArgs) {
for i, v := range values {
if handler.inputArgs[i].Kind() != reflect.Ptr && v.Kind() == reflect.Ptr {
values[i] = v.Elem()
}
}
} else {
s.onError(fmt.Errorf("sio: onEvent: invalid number of arguments"))
return
}
err = s.callMiddlewares(values)
if err != nil {
s.onError(err)
return
}
if !s.Connected() {
s.debug.Log("ignore packet received after disconnection")
return
}
ack, _ := handler.ack()
if header.ID != nil && ack {
hasAckFunc = true
// We already know that the last value of the handler is an ack function
// and it doesn't have a return value. So dismantle it, and create it with reflect.MakeFunc.
f := values[len(values)-1]
in, variadic := dismantleAckFunc(f.Type())
rt := reflect.FuncOf(in, nil, variadic)
f = reflect.MakeFunc(rt, func(args []reflect.Value) (results []reflect.Value) {
sendAck(*header.ID, args)
return nil
})
values[len(values)-1] = f
}
_, err = handler.call(values...)
if err != nil {
s.onError(wrapInternalError(err))
return
}
return
}
func (s *serverSocket) onAck(header *parser.PacketHeader, decode parser.Decode) {
if header.ID == nil {
s.onError(wrapInternalError(fmt.Errorf("header.ID is nil")))
return
}
s.debug.Log("Calling ack with ID", *header.ID)
s.acksMu.Lock()
ack, ok := s.acks[*header.ID]
if ok {
delete(s.acks, *header.ID)
}
s.acksMu.Unlock()
if !ok {
s.onError(wrapInternalError(fmt.Errorf("ACK with ID %d not found", *header.ID)))
return
}
inputArgs := ack.inputArgs
if ack.hasError {
inputArgs = inputArgs[1:]
}
values, err := decode(inputArgs...)
if err != nil {
s.onError(wrapInternalError(err))
return
}
if len(values) == len(inputArgs) {
for i, v := range values {
if inputArgs[i].Kind() != reflect.Ptr && v.Kind() == reflect.Ptr {
values[i] = v.Elem()
}
}
} else {
s.onError(fmt.Errorf("sio: onEvent: invalid number of arguments"))
return
}
err = ack.call(values...)
if err != nil {
s.onError(wrapInternalError(err))
return
}
}
func (s *serverSocket) Join(room ...Room) {
s.joinMu.Lock()
join := s.join
s.joinMu.Unlock()
join(room...)
}
func (s *serverSocket) Leave(room Room) {
s.debug.Log("Leaving room", room)
s.adapter.Delete(s.ID(), room)
}
func (s *serverSocket) Rooms() mapset.Set[Room] {
rooms, ok := s.adapter.SocketRooms(s.ID())
if !ok {
return mapset.NewSet[Room]()
}
return rooms
}
func (s *serverSocket) To(room ...Room) *BroadcastOperator {
return s.newBroadcastOperator().To(room...)
}
func (s *serverSocket) In(room ...Room) *BroadcastOperator {
return s.To(room...)
}
func (s *serverSocket) Except(room ...Room) *BroadcastOperator {
return s.newBroadcastOperator().Except(room...)
}
func (s *serverSocket) Local() *BroadcastOperator {
return s.newBroadcastOperator().Local()
}
func (s *serverSocket) Broadcast() *BroadcastOperator {
return s.newBroadcastOperator()
}
func (s *serverSocket) newBroadcastOperator() *BroadcastOperator {
return adapter.NewBroadcastOperator(s.nsp.Name(), s.adapter, IsEventReservedForServer).Except(Room(s.ID()))
}
type sidInfo struct {
SID string `json:"sid"`
PID string `json:"pid,omitempty"`
}
func (s *serverSocket) onConnect() error {
s.debug.Log("Socket connected. Locking mutex and writing packet")
s.connectedMu.Lock()
defer s.connectedMu.Unlock()
// Socket ID is the default room a socket joins to.
s.Join(Room(s.ID()))
c := sidInfo{
SID: string(s.ID()),
PID: string(s.pid),
}
s.sendControlPacket(parser.PacketTypeConnect, &c)
s.connected = true
return nil
}
func (s *serverSocket) onError(err error) {
s.errorHandlers.forEach(func(handler *ServerSocketErrorFunc) { (*handler)(err) }, true)
}
func (s *serverSocket) onClose(reason Reason) {
s.debug.Log("Going to close the socket if it is not already closed. Reason", reason)
// Server socket is one-time, it cannot be reconnected.
// We don't want it to close more than once,
// so we use sync.Once to avoid running onClose more than once.
s.closeOnce.Do(func() {
s.debug.Log("Going to close the socket. It is not already closed. Reason", reason)
if !s.Connected() {
return
}
wg := utils.NewTimeoutWaiter(0)
s.disconnectingHandlers.forEach(func(handler *ServerSocketDisconnectingFunc) {
wg.Add(1)
go func() {
defer wg.Done()
(*handler)(reason)
}()
}, false)
if s.server.connectionStateRecovery.Enabled && recoverableDisconnectReasons.Contains(reason) {
s.debug.Log("Connection state recovery is enabled")
rooms, ok := s.adapter.SocketRooms(s.ID())
if !ok {
rooms = mapset.NewThreadUnsafeSet[Room]()
}
s.adapter.PersistSession(&adapter.SessionToPersist{
SID: s.ID(),
PID: s.pid,
Rooms: rooms.ToSlice(),
})
}
s.joinMu.Lock()
s.join = func(room ...Room) {}
s.joinMu.Unlock()
wg.WaitTimeout(10 * time.Second)
s.leaveAll()
s.nsp.remove(s)
s.conn.remove(s)
s.connectedMu.Lock()
s.connected = false
s.connectedMu.Unlock()
s.disconnectHandlers.forEach(func(handler *ServerSocketDisconnectFunc) { (*handler)(reason) }, true)
})
}
func (s *serverSocket) leaveAll() {
s.adapter.DeleteAll(s.ID())
}
func (s *serverSocket) ID() SocketID {
return s.id
}
func (s *serverSocket) Emit(eventName string, v ...any) {
s.emit(eventName, 0, false, false, v...)
}
func (s *serverSocket) emit(
eventName string,
timeout time.Duration,
volatile, fromQueue bool,
_v ...any) {
header := &parser.PacketHeader{
Type: parser.PacketTypeEvent,
Namespace: s.nsp.Name(),
}
if IsEventReservedForServer(eventName) {
panic(fmt.Errorf("sio: Emit: attempted to emit a reserved event: `%s`", eventName))
}
// One extra space for eventName,
// the other for ID (see the Broadcast method of sessionAwareAdapter)
v := make([]any, 0, len(_v)+2)
v = append(v, eventName)
v = append(v, _v...)
f := v[len(v)-1]
rt := reflect.TypeOf(f)
if f != nil && rt.Kind() == reflect.Func {
ackID := s.registerAckHandler(f, timeout)
header.ID = &ackID
v = v[:len(v)-1]
}
if s.server.connectionStateRecovery.Enabled {
opts := adapter.NewBroadcastOptions()
opts.Rooms.Add(Room(s.id))
s.adapter.Broadcast(header, v, opts)
} else {
buffers, err := s.parser.Encode(header, &v)
if err != nil {
s.onError(wrapInternalError(err))
return
}
s.conn.sendBuffers(buffers...)
}
}
// 0 as the timeout argument means there is no timeout.
func (s *serverSocket) registerAckHandler(f any, timeout time.Duration) (id uint64) {
id = s.nsp.nextAckID()
s.debug.Log("Registering ack with ID", id)
if timeout == 0 {
s.acksMu.Lock()
h, err := newAckHandler(f, false)
if err != nil {
panic(err)
}
s.acks[id] = h
s.acksMu.Unlock()
return
}
h, err := newAckHandlerWithTimeout(f, timeout, func() {
s.debug.Log("Timeout occured for ack with ID", id, "timeout", timeout)
s.acksMu.Lock()
delete(s.acks, id)
s.acksMu.Unlock()
})
if err != nil {
panic(err)
}
s.acksMu.Lock()
s.acks[id] = h
s.acksMu.Unlock()
return
}
func (s *serverSocket) Timeout(timeout time.Duration) Emitter {
return Emitter{
socket: s,
timeout: timeout,
}
}
func (s *serverSocket) sendControlPacket(typ parser.PacketType, v any) {
header := parser.PacketHeader{
Type: typ,
Namespace: s.nsp.Name(),
}
var (
buffers [][]byte
err error
)
buffers, err = s.parser.Encode(&header, v)
if err != nil {
s.onError(wrapInternalError(err))
return
}
s.conn.sendBuffers(buffers...)
}
func (s *serverSocket) sendAckPacket(id uint64, values []reflect.Value) {
header := parser.PacketHeader{
Type: parser.PacketTypeAck,
Namespace: s.nsp.Name(),
ID: &id,
}
v := make([]any, len(values))
for i := range values {
if values[i].CanInterface() {
v[i] = values[i].Interface()
} else {
s.onError(fmt.Errorf("sio: sendAck: CanInterface must be true"))
return
}
}
buffers, err := s.parser.Encode(&header, &v)
if err != nil {
s.onError(wrapInternalError(err))
return
}
s.conn.sendBuffers(buffers...)
}
func (s *serverSocket) Disconnect(close bool) {
if !s.Connected() {
return
}
if close {
s.conn.disconnectAll()
s.conn.close()
} else {
s.sendControlPacket(parser.PacketTypeDisconnect, nil)
s.onClose(ReasonServerNamespaceDisconnect)
}
}