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#!/bin/bash
#
# Usage: test-apiv2 [PORT]
#
# DEVELOPER NOTE: you almost certainly don't need to play in here. See README.
#
ME=$(basename $0)

###############################################################################
# BEGIN stuff you can but probably shouldn't customize

PODMAN_TEST_IMAGE_REGISTRY=${PODMAN_TEST_IMAGE_REGISTRY:-"quay.io"}
PODMAN_TEST_IMAGE_USER=${PODMAN_TEST_IMAGE_USER:-"libpod"}
PODMAN_TEST_IMAGE_NAME=${PODMAN_TEST_IMAGE_NAME:-"alpine_labels"}
PODMAN_TEST_IMAGE_TAG=${PODMAN_TEST_IMAGE_TAG:-"latest"}
PODMAN_TEST_IMAGE_FQN="$PODMAN_TEST_IMAGE_REGISTRY/$PODMAN_TEST_IMAGE_USER/$PODMAN_TEST_IMAGE_NAME:$PODMAN_TEST_IMAGE_TAG"

IMAGE=$PODMAN_TEST_IMAGE_FQN

# END   stuff you can but probably shouldn't customize
###############################################################################
# BEGIN setup

TMPDIR=${TMPDIR:-/tmp}
WORKDIR=$(mktemp --tmpdir -d $ME.tmp.XXXXXX)

# Log of all HTTP requests and responses
LOG=${TMPDIR}/$ME.log.$(date +'%Y%m%dT%H%M%S')

HOST=localhost
PORT=${PODMAN_SERVICE_PORT:-8081}

# Keep track of test count and failures in files, not variables, because
# variables don't carry back up from subshells.
testcounter_file=$WORKDIR/.testcounter
failures_file=$WORKDIR/.failures

echo 0 >$testcounter_file
echo 0 >$failures_file

# Where the tests live
TESTS_DIR=$(realpath $(dirname $0))

# END   setup
###############################################################################
# BEGIN infrastructure code - the helper functions used in tests themselves

#########
#  die  #  Exit error with a message to stderr
#########
function die() {
    echo "$ME: $*" >&2
    exit 1
}

########
#  is  #  Simple comparison
########
function is() {
    local actual=$1
    local expect=$2
    local testname=$3

    if [ "$actual" = "$expect" ]; then
        # On success, include expected value; this helps readers understand
        _show_ok 1 "$testname=$expect"
        return
    fi
    _show_ok 0 "$testname" "$expect" "$actual"
}

##########
#  like  #  Compare, but allowing patterns
##########
function like() {
    local actual=$1
    local expect=$2
    local testname=$3

    if expr "$actual" : "$expect" &>/dev/null; then
        # On success, include expected value; this helps readers understand
        _show_ok 1 "$testname~$expect"
        return
    fi
    _show_ok 0 "$testname" "~ $expect" "$actual"
}

##############
#  _show_ok  #  Helper for is() and like(): displays 'ok' or 'not ok'
##############
function _show_ok() {
    local ok=$1
    local testname=$2

    # If output is a tty, colorize pass/fail
    local red=
    local green=
    local reset=
    local bold=
    if [ -t 3 ]; then
        red='\e[31m'
        green='\e[32m'
        reset='\e[0m'
        bold='\e[1m'
    fi

    _bump $testcounter_file
    count=$(<$testcounter_file)
    if [ $ok -eq 1 ]; then
        echo -e "${green}ok $count $testname${reset}" >&3
        return
    fi

    # Failed
    local expect=$3
    local actual=$4
    echo -e "${red}not ok $count $testname${reset}"       >&3
    echo -e "${red}#  expected: $expect${reset}"          >&3
    echo -e "${red}#    actual: ${bold}$actual${reset}"   >&3

    _bump $failures_file
}

###########
#  _bump  #  Increment a counter in a file
###########
function _bump() {
    local file=$1

    count=$(<$file)
    echo $(( $count + 1 )) >| $file
}

#############
#  jsonify  #  convert 'foo=bar,x=y' to json {"foo":"bar","x":"y"}
#############
function jsonify() {
    # split by comma
    local -a settings_in
    read -ra settings_in <<<"$1"

    # convert each to double-quoted form
    local -a settings_out
    for i in ${settings_in[*]}; do
        settings_out+=$(sed -e 's/\(.*\)=\(.*\)/"\1":"\2"/' <<<$i)
    done

    # ...and wrap inside braces.
    # FIXME: handle commas
    echo "{${settings_out[*]}}"
}

#######
#  t  #  Main test helper
#######
function t() {
    local method=$1; shift
    local path=$1; shift
    local curl_args

    local testname="$method $path"
    # POST requests require an extra params arg
    if [[ $method = "POST" ]]; then
        curl_args="-d $(jsonify $1)"
        testname="$testname [$1]"
        shift
    fi
    # curl -X HEAD but without --head seems to wait for output anyway
    if [[ $method == "HEAD" ]]; then
        curl_args="--head"
    fi
    local expected_code=$1; shift

    # If given path begins with /, use it as-is; otherwise prepend /version/
    local url=http://$HOST:$PORT
    if expr "$path" : "/" >/dev/null; then
        url="$url$path"
    else
        url="$url/v1.40/$path"
    fi

    # Log every action we do
    echo "-------------------------------------------------------------" >>$LOG
    echo "\$ $testname"                                                  >>$LOG
    rm -f $WORKDIR/curl.*
    curl -s -X $method ${curl_args}                   \
         -H 'Content-type: application/json'          \
         --dump-header $WORKDIR/curl.headers.out       \
         -o $WORKDIR/curl.result.out "$url"

    if [[ $? -eq 7 ]]; then
        echo "FATAL: curl failure on $url - cannot continue" >&2
        exit 1
    fi

    cat $WORKDIR/curl.headers.out $WORKDIR/curl.result.out >>$LOG 2>/dev/null || true

    # Test return code
    actual_code=$(head -n1 $WORKDIR/curl.headers.out | awk '/^HTTP/ { print $2}')
    is "$actual_code" "$expected_code" "$testname : status"

    output=$(< $WORKDIR/curl.result.out)

    for i; do
        case "$i" in
            # Exact match on json field
            .*=*)
                json_field=$(expr "$i" : "\([^=]*\)=")
                expect=$(expr "$i" : '[^=]*=\(.*\)')
                actual=$(jq -r "$json_field" <<<"$output")
                is "$actual" "$expect" "$testname : $json_field"
                ;;
            # regex match on json field
            .*~*)
                json_field=$(expr "$i" : "\([^~]*\)~")
                expect=$(expr "$i" : '[^~]*~\(.*\)')
                actual=$(jq -r "$json_field" <<<"$output")
                like "$actual" "$expect" "$testname : $json_field"
                ;;
            # Direct string comparison
            *)
                is "$output" "$i" "$testname : output"
                ;;
        esac
    done
}

###################
#  start_service  #  Run the socket listener
###################
service_pid=
function start_service() {
    # If there's a listener on the port, nothing for us to do
    echo -n >/dev/tcp/$HOST/$PORT &>/dev/null && return

    if [ "$HOST" != "localhost" ]; then
        die "Cannot start service on non-localhost ($HOST)"
    fi

    if [ $(id -u) -ne 0 ]; then
        echo "$ME: WARNING: running service rootless is unlikely to work!" >&2
    fi

    # Find the binary
    SERVICE_BIN=${SERVICE_BIN:-${TESTS_DIR}/../../bin/service}
    test -x $SERVICE_BIN || die "Not found: $SERVICE_BIN"

    systemd-socket-activate -l 127.0.0.1:$PORT \
                            $SERVICE_BIN --root $WORKDIR/root \
        &> $WORKDIR/server.log &
    service_pid=$!

    # Wait
    local _timeout=5
    while [ $_timeout -gt 0 ]; do
        echo -n >/dev/tcp/$HOST/$PORT &>/dev/null && return
        sleep 1
        _timeout=$(( $_timeout - 1 ))
    done
    die "Timed out waiting for service"
}

# END   infrastructure code
###############################################################################
# BEGIN sanity checks

for tool in curl jq podman; do
    type $tool &>/dev/null || die "$ME: Required tool '$tool' not found"
done

# END   sanity checks
###############################################################################
# BEGIN entry handler (subtest invoker)

# Identify the tests to run. If called with args, use those as globs.
tests_to_run=()
if [ -n "$*" ]; then
    shopt -s nullglob
    for i; do
        match=(${TESTS_DIR}/*${i}*.at)
        if [ ${#match} -eq 0 ]; then
            die "No match for $TESTS_DIR/*$i*.at"
        fi
        tests_to_run+=("${match[@]}")
    done
    shopt -u nullglob
else
    tests_to_run=($TESTS_DIR/*.at)
fi

# Because subtests may run podman or other commands that emit stderr;
# redirect all those and use fd 3 for all output
exec 3>&1 &>$WORKDIR/output.log

start_service

for i in ${tests_to_run[@]}; do
    source $i
done

# END   entry handler
###############################################################################

# Clean up

if [ -n "$service_pid" ]; then
    # Yep, has to be -9. It ignores everything else.
    kill -9 $service_pid
fi

test_count=$(<$testcounter_file)
failure_count=$(<$failures_file)

if [ $failure_count -gt 0 -a -s "$WORKDIR/output.log" ]; then
    echo "# Collected stdout/stderr:"         >&3
    sed -e 's/^/# /' < $WORKDIR/output.log    >&3
fi

if [ -z "$PODMAN_TESTS_KEEP_WORKDIR" ]; then
    rm -rf $WORKDIR
fi

echo "1..${test_count}" >&3

exit $failure_count