tests/test-limit.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2019-2020 Red Hat Inc.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
   7 # met:
   8 #
   9 # * Redistributions of source code must retain the above copyright
  10 # notice, this list of conditions and the following disclaimer.
  11 #
  12 # * Redistributions in binary form must reproduce the above copyright
  13 # notice, this list of conditions and the following disclaimer in the
  14 # documentation and/or other materials provided with the distribution.
  15 #
  16 # * Neither the name of Red Hat nor the names of its contributors may be
  17 # used to endorse or promote products derived from this software without
  18 # specific prior written permission.
  19 #
  20 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  24 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  27 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  28 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31 # SUCH DAMAGE.
  32
  33 source ./functions.sh
  34 set -e
  35 set -x
  36
  37 requires nbdsh --version
  38
  39 sock=$(mktemp -u /tmp/nbdkit-test-sock.XXXXXX)
  40 files="limit.pid $sock"
  41 cleanup_fn rm -f $files
  42
  43 # Start nbdkit with the limit filter and a limit of 2 clients.
  44 start_nbdkit -P limit.pid -U $sock --filter=limit memory size=1M limit=2
  45
  46 export sock
  47
  48 nbdsh -c - <<'EOF'
  49 import os
  50 import sys
  51 import time
  52
  53 sock = os.environ["sock"]
  54
  55 # It should be possible to connect two clients.
  56 # Note that nbdsh creates the ‘h’ handle implicitly.
  57 h.connect_unix(sock)
  58 h2 = nbd.NBD()
  59 h2.connect_unix(sock)
  60
  61 # A third connection is expected to fail.
  62 try:
  63     h3 = nbd.NBD()
  64     h3.connect_unix(sock)
  65     # This should not happen.
  66     sys.exit(1)
  67 except nbd.Error:
  68     pass
  69
  70 # Close one of the existing connections.
  71 del h2
  72
  73 # There's a possible race between closing the client socket
  74 # and nbdkit noticing and closing the connection.
  75 time.sleep(5)
  76
  77 # Now a new connection should be possible.
  78 h4 = nbd.NBD()
  79 h4.connect_unix(sock)
  80
  81 EOF