REGTESTS: proxy: test monitor-uri and the monitor fail condition

"monitor fail" had no coverage and "monitor-uri" was only used as a
side setting of a health check test.

The test checks that the monitor URI is answered by the frontend
without reaching the backend while the other URIs are still forwarded,
that the status switches from 200 to 503 when the condition is met,
that the "unless" form inverts that, and that the monitor response
goes through the error files of the proxy as documented.

diff --git a/reg-tests/proxy/monitor.vtc b/reg-tests/proxy/monitor.vtc
new file mode 100644 (file)
index 0000000..52620e2
--- /dev/null
+++ b/reg-tests/proxy/monitor.vtc
@@ -0,0 +1,91 @@
+varnishtest "Test monitor-uri and the monitor fail condition"
+
+# "monitor fail" had no coverage, and "monitor-uri" was only used as a
+# side setting of a health check test. The test checks that the monitor
+# URI is answered locally without reaching the backend, that the status
+# switches from 200 to 503 when the condition is met, that the "unless"
+# form inverts it, and that the errorfile of the corresponding status
+# applies to the monitor response as documented.
+
+feature ignore_unknown_macro
+
+server s1 {
+       rxreq
+       expect req.url == "/regular"
+       txresp -body "from the server"
+} -start
+
+haproxy h1 -conf {
+    global
+    .if feature(THREAD)
+        thread-groups 1
+    .endif
+        chroot /
+
+    defaults
+       mode http
+       timeout connect "${HAPROXY_TEST_TIMEOUT-5s}"
+       timeout client  "${HAPROXY_TEST_TIMEOUT-5s}"
+       timeout server  "${HAPROXY_TEST_TIMEOUT-5s}"
+
+    frontend fe1
+       bind "fd@${fe1}"
+       monitor-uri /health
+       monitor fail if { req.hdr(x-down) -m found }
+       default_backend be
+
+    # the "unless" form reports a failure as long as the condition is
+    # not satisfied
+    frontend fe2
+       bind "fd@${fe2}"
+       monitor-uri /health
+       monitor fail unless { req.hdr(x-up) -m found }
+       default_backend be
+
+    # the monitor response goes through the error files of the proxy
+    frontend fe3
+       bind "fd@${fe3}"
+       errorloc302 503 http://www.example.com/down
+       monitor-uri /health
+       monitor fail if { req.hdr(x-down) -m found }
+       default_backend be
+
+    backend be
+       server s1 ${s1_addr}:${s1_port}
+} -start
+
+client c1 -connect ${h1_fe1_sock} {
+       # the monitor URI is answered by the frontend itself
+       txreq -url "/health"
+       rxresp
+       expect resp.status == 200
+       expect resp.body != "from the server"
+
+       # the condition is met, the monitor now reports a failure
+       txreq -url "/health" -hdr "x-down: 1"
+       rxresp
+       expect resp.status == 503
+
+       # any other URI is forwarded as usual
+       txreq -url "/regular"
+       rxresp
+       expect resp.status == 200
+       expect resp.body == "from the server"
+} -run
+
+client c2 -connect ${h1_fe2_sock} {
+       txreq -url "/health"
+       rxresp
+       expect resp.status == 503
+
+       txreq -url "/health" -hdr "x-up: 1"
+       rxresp
+       expect resp.status == 200
+} -run
+
+client c3 -connect ${h1_fe3_sock} {
+       txreq -url "/health" -hdr "x-down: 1"
+       rxresp
+       expect resp.status == 302
+       expect resp.http.location == "http://www.example.com/down"
+} -run