tests/test-retry.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018-2019 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 qemu-img --version
  38
  39 files="retry.img retry-count retry-open-count"
  40 rm -f $files
  41 cleanup_fn rm -f $files
  42
  43 touch retry-count retry-open-count
  44 start_t=$SECONDS
  45
  46 # Create a custom plugin which will test retrying.
  47 nbdkit -v -U - \
  48        sh - \
  49        --filter=retry retry-delay=1 \
  50        --run 'qemu-img convert $nbd retry.img' <<'EOF'
  51 #!/usr/bin/env bash
  52 case "$1" in
  53     open)
  54         # Count how many times the connection is (re-)opened.
  55         read i < retry-open-count
  56         echo $((i+1)) > retry-open-count
  57         ;;
  58     pread)
  59         # Fail 3 times then succeed.
  60         read i < retry-count
  61         ((i++))
  62         echo $i > retry-count
  63         if [ $i -le 3 ]; then
  64             echo "EIO pread failed" >&2
  65             exit 1
  66         else
  67             dd if=/dev/zero count=$3 iflag=count_bytes
  68         fi
  69         ;;
  70
  71     get_size) echo 512 ;;
  72     *) exit 2 ;;
  73 esac
  74 EOF
  75
  76 # In this test we should see 3 failures:
  77 # pread FAILS
  78 # retry and wait 1 seconds
  79 # pread FAILS
  80 # retry and wait 2 seconds
  81 # pread FAILS
  82 # retry and wait 4 seconds
  83 # pread succeeds
  84
  85 # The minimum time for the test should be 1+2+4 = 7 seconds.
  86 end_t=$SECONDS
  87 if [ $((end_t - start_t)) -lt 7 ]; then
  88     echo "$0: test ran too quickly"
  89     exit 1
  90 fi
  91
  92 # Check the handle was opened 4 times (first open + one reopen for
  93 # each retry).
  94 read open_count < retry-open-count
  95 if [ $open_count -ne 4 ]; then
  96     echo "$0: open-count ($open_count) != 4"
  97     exit 1
  98 fi