func handleConnection(user user.User, conn *ss.Conn, auth bool) {
var host string
connCnt++ // this maybe not accurate, but should be enough
if connCnt-nextLogConnCnt >= 0 {
// XXX There's no xadd in the atomic package, so it's difficult to log
// the message only once with low cost. Also note nextLogConnCnt maybe
// added twice for current peak connection number level.
Log.Debug("Number of client connections reaches %d\n", nextLogConnCnt)
nextLogConnCnt += logCntDelta
}
// function arguments are always evaluated, so surround debug statement
// with if statement
Log.Debug(fmt.Sprintf("new client %s->%s\n", conn.RemoteAddr().String(), conn.LocalAddr()))
closed := false
defer func() {
if ssdebug {
Log.Debug(fmt.Sprintf("closed pipe %s<->%s\n", conn.RemoteAddr(), host))
}
connCnt--
if !closed {
conn.Close()
}
}()
host, res_size, ota, err := getRequest(conn, auth)
if err != nil {
Log.Error("error getting request", conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
Log.Info(fmt.Sprintf("[port-%d]connecting %s ", user.GetPort(), host))
remote, err := net.Dial("tcp", host)
if err != nil {
if ne, ok := err.(*net.OpError); ok && (ne.Err == syscall.EMFILE || ne.Err == syscall.ENFILE) {
// log too many open file error
// EMFILE is process reaches open file limits, ENFILE is system limit
Log.Error("dial error:", err)
} else {
Log.Error("error connecting to:", host, err)
}
return
}
defer func() {
if !closed {
remote.Close()
}
}()
// debug conn info
Log.Debug(fmt.Sprintf("%d conn debug: local addr: %s | remote addr: %s network: %s ", user.GetPort(),
conn.LocalAddr().String(), conn.RemoteAddr().String(), conn.RemoteAddr().Network()))
err = storage.IncrSize(user, res_size)
if err != nil {
Log.Error(err)
return
}
err = storage.MarkUserOnline(user)
if err != nil {
Log.Error(err)
return
}
Log.Debug(fmt.Sprintf("[port-%d] store size: %d", user.GetPort(), res_size))
Log.Info(fmt.Sprintf("piping %s<->%s ota=%v connOta=%v", conn.RemoteAddr(), host, ota, conn.IsOta()))
if ota {
go PipeThenCloseOta(conn, remote, false, host, user)
} else {
go PipeThenClose(conn, remote, false, host, user)
}
PipeThenClose(remote, conn, true, host, user)
closed = true
return
}
