#!/usr/bin/env bash
# nbdkit
# Copyright Red Hat
#
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#
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# SUCH DAMAGE.

source ./functions.sh
set -e
set -x

requires_run
requires_plugin sh
requires qemu-io --version

files="retry-readonly-count retry-readonly-open-count"
rm -f $files
cleanup_fn rm -f $files

touch retry-readonly-count retry-readonly-open-count
start_t=$SECONDS

# Create a custom plugin which will test retrying.
nbdkit -v \
       sh - \
       --filter=retry retry-delay=1 retry-readonly=yes \
       --run 'qemu-io -f raw -c "w 0 512" -c "w 0 512" "$uri" || :' <<'EOF'
#!/usr/bin/env bash
case "$1" in
    open)
        # Count how many times the connection is (re-)opened.
        read i < retry-readonly-open-count
        echo $((i+1)) > retry-readonly-open-count
        ;;
    can_write) ;;
    pwrite)
        # Fail 3 times then succeed - however, force-readonly means we will
        # never return here after the first failure.
        read i < retry-readonly-count
        ((i++))
        echo $i > retry-readonly-count
        if [ $i -le 3 ]; then
            echo "EIO pwrite failed" >&2
            exit 1
        else
            : drop data
        fi
        ;;

    get_size) echo 512 ;;
    *) exit 2 ;;
esac
EOF

# In this test we should see 3 failures:
# first pwrite FAILS
# retry and wait 1 seconds
# first pwrite FAILS immediately now that connection is readonly
# second pwrite FAILS immediately

# The minimum time for the test should be 1 second.
end_t=$SECONDS
if [ $((end_t - start_t)) -lt 1 ]; then
    echo "$0: test ran too quickly"
    exit 1
fi

# Check the handle was opened 2 times (first open + one reopen).
read open_count < retry-readonly-open-count
if [ $open_count -ne 2 ]; then
    echo "$0: open-count ($open_count) != 2"
    exit 1
fi
