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package xdsserver
import (
"net/http"
"github.com/Sirupsen/logrus"
"github.com/gin-gonic/gin"
"github.com/googollee/go-socket.io"
"github.com/iotbzh/xds-agent/lib/apiv1"
"github.com/iotbzh/xds-agent/lib/session"
"github.com/iotbzh/xds-agent/lib/xdsconfig"
)
// ServerService .
type ServerService struct {
router *gin.Engine
api *apiv1.APIService
sIOServer *socketio.Server
webApp *gin.RouterGroup
cfg *xdsconfig.Config
sessions *session.Sessions
log *logrus.Logger
stop chan struct{} // signals intentional stop
}
const indexFilename = "index.html"
const cookieMaxAge = "3600"
// NewServer creates an instance of ServerService
func NewServer(conf *xdsconfig.Config, log *logrus.Logger) *ServerService {
// Setup logging for gin router
if log.Level == logrus.DebugLevel {
gin.SetMode(gin.DebugMode)
} else {
gin.SetMode(gin.ReleaseMode)
}
// TODO
// - try to bind gin DefaultWriter & DefaultErrorWriter to logrus logger
// - try to fix pb about isTerminal=false when out is in VSC Debug Console
//gin.DefaultWriter = ??
//gin.DefaultErrorWriter = ??
// Creates gin router
r := gin.New()
svr := &ServerService{
router: r,
api: nil,
sIOServer: nil,
webApp: nil,
cfg: conf,
log: log,
sessions: nil,
stop: make(chan struct{}),
}
return svr
}
// Serve starts a new instance of the Web Server
func (s *ServerService) Serve() error {
var err error
// Setup middlewares
s.router.Use(gin.Logger())
s.router.Use(gin.Recovery())
s.router.Use(s.middlewareXDSDetails())
s.router.Use(s.middlewareCORS())
// Sessions manager
s.sessions = session.NewClientSessions(s.router, s.log, cookieMaxAge)
// Create REST API
s.api = apiv1.New(s.sessions, s.cfg, s.log, s.router)
// Websocket routes
s.sIOServer, err = socketio.NewServer(nil)
if err != nil {
s.log.Fatalln(err)
}
s.router.GET("/socket.io/", s.socketHandler)
s.router.POST("/socket.io/", s.socketHandler)
/* TODO: do we want to support ws://... ?
s.router.Handle("WS", "/socket.io/", s.socketHandler)
s.router.Handle("WSS", "/socket.io/", s.socketHandler)
*/
// Serve in the background
serveError := make(chan error, 1)
go func() {
serveError <- http.ListenAndServe(":"+s.cfg.HTTPPort, s.router)
}()
// Wait for stop, restart or error signals
select {
case <-s.stop:
// Shutting down permanently
s.sessions.Stop()
s.log.Infoln("shutting down (stop)")
case err = <-serveError:
// Error due to listen/serve failure
s.log.Errorln(err)
}
return nil
}
// Stop web server
func (s *ServerService) Stop() {
close(s.stop)
}
// Add details in Header
func (s *ServerService) middlewareXDSDetails() gin.HandlerFunc {
return func(c *gin.Context) {
c.Header("XDS-Agent-Version", s.cfg.Version)
c.Header("XDS-API-Version", s.cfg.APIVersion)
c.Next()
}
}
// CORS middleware
func (s *ServerService) middlewareCORS() gin.HandlerFunc {
return func(c *gin.Context) {
if c.Request.Method == "OPTIONS" {
c.Header("Access-Control-Allow-Origin", "*")
c.Header("Access-Control-Allow-Headers", "Content-Type")
c.Header("Access-Control-Allow-Methods", "POST, DELETE, GET, PUT")
c.Header("Content-Type", "application/json")
c.Header("Access-Control-Max-Age", cookieMaxAge)
c.AbortWithStatus(204)
return
}
c.Next()
}
}
// socketHandler is the handler for the "main" websocket connection
func (s *ServerService) socketHandler(c *gin.Context) {
// Retrieve user session
sess := s.sessions.Get(c)
if sess == nil {
c.JSON(500, gin.H{"error": "Cannot retrieve session"})
return
}
s.sIOServer.On("connection", func(so socketio.Socket) {
s.log.Debugf("WS Connected (SID=%v)", so.Id())
s.sessions.UpdateIOSocket(sess.ID, &so)
so.On("disconnection", func() {
s.log.Debugf("WS disconnected (SID=%v)", so.Id())
s.sessions.UpdateIOSocket(sess.ID, nil)
})
})
s.sIOServer.On("error", func(so socketio.Socket, err error) {
s.log.Errorf("WS SID=%v Error : %v", so.Id(), err.Error())
})
s.sIOServer.ServeHTTP(c.Writer, c.Request)
}
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