#!/bin/bash
# -*- shell-script-mode -*-
#
# Helpers for NBD server related config
#
# Copyright (C) 2018 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

nbd_unix_socket="${TEST_DIR}/qemu-nbd.sock"
nbd_tcp_addr="127.0.0.1"
nbd_pid_file="${TEST_DIR}/qemu-nbd.pid"

function nbd_server_stop()
{
    local NBD_PID
    if [ -f "$nbd_pid_file" ]; then
        read NBD_PID < "$nbd_pid_file"
        rm -f "$nbd_pid_file"
        if [ -n "$NBD_PID" ]; then
            kill "$NBD_PID"
        fi
    fi
    rm -f "$nbd_unix_socket"
}

function nbd_server_wait_for_unix_socket()
{
    pid=$1

    for ((i = 0; i < 300; i++))
    do
        if [ -r "$nbd_unix_socket" ]; then
            return
        fi
        kill -s 0 $pid 2>/dev/null
        if test $? != 0
        then
            echo "qemu-nbd unexpectedly quit"
            exit 1
        fi
        sleep 0.1
    done
    echo "Failed in check of unix socket created by qemu-nbd"
    exit 1
}

function nbd_server_start_unix_socket()
{
    nbd_server_stop
    $QEMU_NBD -v -t -k "$nbd_unix_socket" "$@" &
    nbd_server_wait_for_unix_socket $!
}

function nbd_server_set_tcp_port()
{
    (ss --help) >/dev/null 2>&1 || _notrun "ss utility not found, skipping test"

    for ((port = 10809; port <= 10909; port++))
    do
        if ! ss -tln | grep -sqE ":$port\b"; then
            nbd_tcp_port=$port
            return
        fi
    done

    echo "Cannot find free TCP port for nbd in range 10809-10909"
    exit 1
}

function nbd_server_wait_for_tcp_socket()
{
    pid=$1

    for ((i = 0; i < 300; i++))
    do
        if ss -tln | grep -sqE ":$nbd_tcp_port\b"; then
            return
        fi
        kill -s 0 $pid 2>/dev/null
        if test $? != 0
        then
            echo "qemu-nbd unexpectedly quit"
            exit 1
        fi
        sleep 0.1
    done
    echo "Failed in check of TCP socket created by qemu-nbd"
    exit 1
}

function nbd_server_start_tcp_socket()
{
    nbd_server_stop
    $QEMU_NBD -v -t -b $nbd_tcp_addr -p $nbd_tcp_port "$@" &
    nbd_server_wait_for_tcp_socket $!
}