Varnish - goto and fallback

goto_fallback.vtc

varnishtest "Goto and fallbacks"

server s1 {
	rxreq
	txresp
	expect req.url == "/probe"

	accept
	rxreq
	txresp
	expect req.url == "/client"

	# Fail this backend
} -start

server s2 {
	rxreq
	txresp
	expect req.url == "/fallback"
} -start

varnish v1 -vcl {
	import directors;
	import goto;

	probe p {
		.url = "/probe";
		.interval = 2s;
		.window = 2;
		.threshold = 2;
		.timeout = 0.1s;
	}

	backend s2 {
		.host = "${s2_addr}";
		.port = "${s2_port}";
	}

	sub vcl_init {
		new s1 = goto.dns_director("${s1_addr}:${s1_port}", probe = p);
		new fallback = directors.fallback();
		fallback.add_backend(s1.backend());
		fallback.add_backend(s2);
	}

	sub vcl_recv {
		set req.backend_hint = fallback.backend();
		return (pass);
	}

	sub vcl_backend_response {
		set beresp.http.backend = beresp.backend;
	}
} -start

delay 1.0

client c1 {
	txreq -url "/client"
	rxresp
	expect resp.status == 200
	expect resp.http.backend ~ "^goto"

	delay 2.0

	txreq -url "/fallback"
	rxresp
	expect resp.status == 200
	expect resp.http.backend == "s2"
} -run