tests/test-retry-request.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018-2021 Red Hat Inc.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
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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
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  23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
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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 --version
  39 requires dd iflag=count_bytes </dev/null
  40
  41 files="retry-request.img retry-request-count"
  42 rm -f $files
  43 cleanup_fn rm -f $files
  44
  45 touch retry-request-count
  46 start_t=$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.img' <<'EOF'
  53 #!/usr/bin/env bash
  54 case "$1" in
  55     get_size) echo 512 ;;
  56     pread)
  57         # Fail 3 times then succeed.
  58         read i < retry-request-count
  59         ((i++))
  60         echo $i > retry-request-count
  61         if [ $i -le 3 ]; then
  62             echo "EIO pread failed" >&2
  63             exit 1
  64         else
  65             dd if=/dev/zero count=$3 iflag=count_bytes
  66         fi
  67         ;;
  68
  69     *) exit 2 ;;
  70 esac
  71 EOF
  72
  73 # In this test we should see 3 failures:
  74 # pread FAILS
  75 # retry and wait 1 second
  76 # pread FAILS
  77 # retry and wait 1 second
  78 # pread FAILS
  79 # retry and wait 1 second
  80 # pread succeeds
  81
  82 # The minimum time for the test should be 3 seconds.
  83 end_t=$SECONDS
  84 if [ $((end_t - start_t)) -lt 3 ]; then
  85     echo "$0: test ran too quickly"
  86     exit 1
  87 fi
  88
  89 # Check retry-request-count = 4 (because we write #retries+1 to the file)
  90 read retry_count < retry-request-count
  91 if [ $retry_count -ne 4 ]; then
  92     echo "$0: retry-request-count ($retry_count) != 4"
  93     exit 1
  94 fi