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server.v2.go
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server.v2.go
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//go:build gc || (eio_svr_v2 && eio_svr_v3 && eio_svr_v4 && eio_svr_v5)
// +build gc eio_svr_v2,eio_svr_v3,eio_svr_v4,eio_svr_v5
package engineio
//
// https://github.com/socketio/engine.io-protocol/tree/v2
// https://github.com/socketio/engine.io/tree/1.8.x
// https://github.com/socketio/engine.io/tree/2.1.x
// https://github.com/socketio/engine.io/compare/1.8.x...2.1.x
//
import (
"context"
"errors"
"net/http"
"sort"
"strings"
"time"
eiop "github.com/oarkflow/socketio/engineio/protocol"
eios "github.com/oarkflow/socketio/engineio/session"
eiot "github.com/oarkflow/socketio/engineio/transport"
)
const Version2 EIOVersionStr = "2"
func init() { registry[Version2.Int()] = NewServerV2 }
type upgradeable struct {
transport eiot.Transporter
isProbeOnInit bool
upgradeFn func() error
err error
}
type serverV2 struct {
path *string
allowUpgrades bool
pingTimeout time.Duration
upgradeTimeout time.Duration
maxHttpBufferSize int
// https://socket.io/how-to/deal-with-cookies
cookie struct {
name string
path string
httpOnly bool
sameSite http.SameSite
}
transportChanBuf int
initialPackets func(eiot.Transporter, *http.Request)
generateID func() SessionID
codec eiot.Codec
eto []eiot.Option
servers map[EIOVersionStr]server
sessions transportSessions
transports map[TransportName]func(SessionID, eiot.Codec) eiot.Transporter
transportRunError chan error
}
func NewServerV2(opts ...Option) Server {
v2 := (&serverV2{}).new(opts...)
v2.With(opts...)
return v2
}
func (v2 *serverV2) new(opts ...Option) *serverV2 {
v2.path = amp("/engine.io")
v2.allowUpgrades = true
v2.pingTimeout = 60000 * time.Millisecond
v2.upgradeTimeout = 10000 * time.Millisecond
v2.maxHttpBufferSize = 10e7
v2.transportChanBuf = 1000
v2.transportRunError = make(chan error, 1)
v2.generateID = eios.GenerateID
v2.codec = eiot.Codec{
PacketEncoder: eiop.NewPacketEncoderV2,
PacketDecoder: eiop.NewPacketDecoderV2,
PayloadEncoder: eiop.NewPayloadEncoderV2,
PayloadDecoder: eiop.NewPayloadDecoderV2,
}
if v2.servers == nil {
v2.servers = make(map[EIOVersionStr]server)
}
v2.servers[Version2] = v2
v2.sessions = NewSessions()
v2.transports = make(map[TransportName]func(SessionID, eiot.Codec) eiot.Transporter)
WithTransport("polling", eiot.NewPollingTransport(v2.transportChanBuf))(v2)
WithTransport("websocket", eiot.NewWebsocketTransport(v2.transportChanBuf))(v2)
v2.eto = []eiot.Option{eiot.WithGovernor(1500*time.Microsecond, 500*time.Microsecond)}
return v2
}
func (v2 *serverV2) With(opts ...Option) {
for _, opt := range opts {
opt(v2)
}
}
func (v2 *serverV2) ServeHTTP(w http.ResponseWriter, r *http.Request) {
_, err := v2.ServeTransport(w, r)
if err != nil {
goto HandleError
}
err = <-v2.transportRunError
HandleError:
if err != nil {
switch {
case errors.Is(err, ErrInvalidRequestHTTPMethod):
return
}
return
}
}
func (v2 *serverV2) ServeTransport(w http.ResponseWriter, r *http.Request) (eiot.Transporter, error) {
if v2.path == nil || !strings.HasPrefix(r.URL.Path, *v2.path) {
return nil, ErrInvalidURIPath
}
sessionID := sessionIDFrom(r)
switch r.Method {
case http.MethodGet, http.MethodOptions:
break
case http.MethodPost:
if sessionID != "" {
break
}
fallthrough
default:
return nil, ErrInvalidRequestHTTPMethod
}
eioVersion := eioVersionFrom(r)
server, ok := v2.servers[eioVersion]
if !ok || eioVersion == "" {
return nil, ErrUnknownEIOVersion
}
transportName := transportNameFrom(r)
if _, ok := v2.transports[transportName]; !ok || transportName == "" {
return nil, ErrUnknownTransport
}
ctx := r.Context()
ctx = context.WithValue(ctx, ctxSessionID, sessionID)
ctx = context.WithValue(ctx, ctxTransportName, transportName)
ctx = context.WithValue(ctx, ctxEIOVersion, eioVersion)
transport, err := server.serveTransport(w, r.WithContext(ctx))
if err != nil {
return nil, err
}
return transport, err
}
func ToEOH(err error) error {
if err == nil {
return EOH
}
return err
}
func (v2 *serverV2) serveTransport(w http.ResponseWriter, r *http.Request) (transport eiot.Transporter, err error) {
ctx := r.Context()
if origin := r.Header.Get("Origin"); origin != "" {
if strings.EqualFold(origin, r.URL.Hostname()) {
w.Header().Set("Access-Control-Allow-Origin", r.URL.Host)
}
}
if strings.ToUpper(r.Method) == "OPTIONS" {
return nil, IOR
}
sessionID, _ := ctx.Value(ctxSessionID).(SessionID)
if sessionID == "" {
sessionID = v2.generateID()
transportName := transportNameFrom(r)
transport = v2.transports[transportName](sessionID, v2.codec)
if err := v2.sessions.Set(transport); err != nil {
return nil, err
}
transport.Send(v2.handshakePacket(sessionID, transportName))
if v2.initialPackets != nil {
v2.initialPackets(transport, r)
}
if t, ok := transport.(interface {
Write(http.ResponseWriter, *http.Request) error
}); ok {
transport.Send(eiop.Packet{T: eiop.NoopPacket, D: eiot.WriteClose{}})
ctx = v2.sessions.WithTimeout(ctx, v2.pingTimeout)
ctx = v2.sessions.WithInterval(ctx, v2.pingTimeout-10*time.Millisecond)
return transport, ToEOH(t.Write(w, r.WithContext(ctx)))
}
}
upgrade := v2.doUpgrade(v2.sessions.Get(sessionID))(w, r)
if upgrade.err != nil {
return nil, upgrade.err
}
var opts []eiot.Option
if upgrade.isProbeOnInit {
opts = []eiot.Option{eiot.OnInitProbe(upgrade.isProbeOnInit)}
}
if upgrade.upgradeFn != nil {
opts = []eiot.Option{eiot.OnUpgrade(upgrade.upgradeFn)}
}
ctx = v2.sessions.WithTimeout(ctx, v2.pingTimeout*4)
ctx = v2.sessions.WithInterval(ctx, v2.pingTimeout)
opts = append(opts, eiot.WithNoPing())
go func() {
v2.transportRunError <- upgrade.transport.Run(w, r.WithContext(ctx), append(v2.eto, opts...)...)
}()
return upgrade.transport, nil
}
func (v2 *serverV2) handshakePacket(sessionID SessionID, transportName TransportName) eiop.Packet {
return eiop.Packet{
T: eiop.OpenPacket,
D: &eiop.HandshakeV2{
SID: sessionID.String(),
Upgrades: v2.upgrades(transportName, v2.transports),
PingTimeout: eiop.Duration(v2.pingTimeout),
},
}
}
func (v2 *serverV2) doUpgrade(transport eiot.Transporter, err error) func(http.ResponseWriter, *http.Request) upgradeable {
return func(w http.ResponseWriter, r *http.Request) upgradeable {
if err != nil {
return upgradeable{transport: transport, err: err}
}
sessionID, from, to := transport.ID(), transport.Name(), transportNameFrom(r)
if to != from {
for _, val := range v2.upgrades(from, v2.transports) {
if string(to) == val {
return upgradeable{
transport: v2.transports[to](sessionID, v2.codec),
isProbeOnInit: true,
upgradeFn: func() error { return v2.sessions.Set(transport) },
err: nil,
}
}
}
return upgradeable{err: ErrTransportUpgradeFailed}
}
return upgradeable{transport: transport, err: err}
}
}
func (v2 *serverV2) upgrades(name TransportName, tps map[TransportName]func(SessionID, eiot.Codec) eiot.Transporter) []string {
if v2.allowUpgrades {
switch name {
case "polling":
var rtn []string
for key := range tps {
if key == name {
continue
}
rtn = append(rtn, string(key))
}
sort.Strings(rtn)
return rtn
}
}
return nil
}