jans_shell_utils/wait_for_url.sh

# Copyright (c) 2022 Jan Lehnardt <jan@apache.org>, MIT licensed
# inspired by https://github.com/pouchdb/pouchdb/blob/25db22fb0ff025b8d2c698da30c6c409066baa0c/bin/run-test.sh#L102-L113
# Team PouchDB, Apache 2 licensed

. ./lib.sh

wait_for_url () {
	assert_arg "$1" && url="$1" || error_and_exit "url not provided, exiting"
	assert_arg "$2" && iterations="$2" || iterations=3
	assert_arg "$3" && duration="$3" || duration=1

	debug "called wait_for_url(url=$url, duration=$duration, iterations=$iterations)"

	waiting=0
	cmd="curl --output /dev/null --silent --insecure --head --fail --max-time 2 $url"

	debug_inline "waiting for $url "
	until ($cmd); do
		if [ $waiting -eq $iterations ]; then
			after=`expr $duration \* $iterations`
			debug_inline "failed, $url can not be reached after $after seconds\n"
			return 1
		fi
		debug_inline .
		waiting=`expr $waiting + 1`
		sleep $duration
	done
	debug_inline " succeeded\n"
}