tests/test-retry.sh

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