tests/test-retry-request-open.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright Red Hat
   4 #
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   6 # modification, are permitted provided that the following conditions are
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  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 #
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  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,
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  26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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  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-request-open.img retry-request-open-count"
  42 rm -f $files
  43 cleanup_fn rm -f $files
  44
  45 touch retry-request-open-count
  46 start_t=$SECONDS
  47
  48 # Create a custom plugin which will test retrying requests.
  49 nbdkit -v -U - \
  50        sh - \
  51        --filter=retry-request retry-request-retries=3 retry-request-delay=1 \
  52        --run 'nbdcopy --synchronous "$uri" retry-request-open.img' <<'EOF'
  53 #!/usr/bin/env bash
  54 case "$1" in
  55     open)
  56         # Fail 3 times then succeed.
  57         read i < retry-request-open-count
  58         ((i++))
  59         echo $i > retry-request-open-count
  60         if [ $i -le 3 ]; then
  61             echo "EIO open failed" >&2
  62             exit 1
  63         else
  64             echo "handle"
  65             exit 0
  66         fi
  67         ;;
  68     get_size) echo 512 ;;
  69     pread)
  70         dd if=/dev/zero count=$3 iflag=count_bytes
  71         ;;
  72     *) exit 2 ;;
  73 esac
  74 EOF
  75
  76 # In this test we should see 3 failures:
  77 # open FAILS
  78 # retry and wait 1 second
  79 # open FAILS
  80 # retry and wait 1 second
  81 # open FAILS
  82 # retry and wait 1 second
  83 # open succeeds
  84 # followed by pread
  85
  86 # The minimum time for the test should be 3 seconds.
  87 end_t=$SECONDS
  88 if [ $((end_t - start_t)) -lt 3 ]; then
  89     echo "$0: test ran too quickly"
  90     exit 1
  91 fi
  92
  93 # Check retry-request-open-count = 4 (because we write #retries+1 to the file)
  94 read retry_count < retry-request-open-count
  95 if [ $retry_count -ne 4 ]; then
  96     echo "$0: retry-request-open-count ($retry_count) != 4"
  97     exit 1
  98 fi