func handleConnection(conn *connection.Conn, auth bool, timeout time.Duration) {
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.Printf("Number of client connections reaches %d\n", nextLogConnCnt)
nextLogConnCnt += logCntDelta
}
// function arguments are always evaluated, so surround debug statement
// with if statement
glog.V(5).Infof("new client %s->%s\n", conn.RemoteAddr().String(), conn.LocalAddr())
closed := false
defer func() {
glog.V(5).Infof("closed pipe %s<->%s\n", conn.RemoteAddr(), host)
connCnt--
if !closed {
conn.Close()
}
}()
host, ota, err := getRequest(conn, auth, timeout)
if err != nil {
glog.Errorf("error getting request %v<->%v err:%v", conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
glog.V(5).Infof("connection host:%v ota:%v \r\n", host, ota)
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
glog.Errorf("dial error:%v\r\n", err)
} else {
glog.Errorf(" connecting to:%v occur err:%v", host, err)
}
return
}
defer func() {
if !closed {
remote.Close()
}
}()
glog.V(5).Infof("piping %s<->%s ota=%v connOta=%v", conn.RemoteAddr(), host, ota, conn.IsOta())
if ota {
go connection.PipeThenCloseOta(conn, remote, timeout)
} else {
go connection.PipeThenClose(conn, remote, timeout)
}
connection.PipeThenClose(remote, conn, timeout)
closed = true
return
}
