Commit 115b6bf5 by Łukasz Nowak Committed by Łukasz Nowak

caddy-frontend: Prove that stale-if-error works

Added assertion which proves that the ATS is serving stale content in case if
the backend does not work, according to RFC5861.

It is beleived that stale-while-revalidate will work the same way, but it is
much harder to test, thus it is not done directly.
1 parent 7017a46e
......@@ -588,6 +588,16 @@ class TestHandler(BaseHTTPRequestHandler):
timeout = int(self.headers.dict.get('Timeout', '0'))
time.sleep(timeout)
self.send_response(200)
prefix = 'x-reply-header-'
lenght = len(prefix)
for key, value in self.headers.dict.items():
if key.startswith(prefix):
self.send_header(
'-'.join([q.capitalize() for q in key[lenght:].split('-')]),
value.strip()
)
self.send_header("Content-type", "application/json")
self.send_header('Set-Cookie', 'secured=value;secure')
self.send_header('Set-Cookie', 'nonsecured=value')
......@@ -2528,13 +2538,11 @@ http://apachecustomhttpsaccepted.example.com:%%(http_port)s {
def test_enable_cache(self):
parameter_dict = self.assertSlaveBase('enable_cache')
result = self.fakeHTTPSResult(
result = self.fakeHTTPResult(
parameter_dict['domain'], parameter_dict['public-ipv4'],
'test-path/deep/.././deeper')
self.assertEqual(
self.certificate_pem,
der2pem(result.peercert))
'test-path/deep/.././deeper', headers={
'X-Reply-Header-Cache-Control': 'max-age=1, stale-while-'
'revalidate=3600, stale-if-error=3600'})
self.assertEqualResultJson(result, 'Path', '/test-path/deeper')
......@@ -2553,8 +2561,10 @@ http://apachecustomhttpsaccepted.example.com:%%(http_port)s {
self.assertEqual(
{
'Content-type': 'application/json',
'Set-Cookie': 'secured=value;secure, nonsecured=value'
},
'Set-Cookie': 'secured=value;secure, nonsecured=value',
'Cache-Control': 'max-age=1, stale-while-revalidate=3600, '
'stale-if-error=3600'
},
headers
)
......@@ -2566,6 +2576,71 @@ http://apachecustomhttpsaccepted.example.com:%%(http_port)s {
r'^http\/1.1 caddy-frontend-1\[.*\] \(ApacheTrafficServer\/7.1.6\)$'
)
# check stale-if-error support (assumes stale-while-revalidate is same)
# wait a bit for max-age to expire
time.sleep(2)
# real check: cache access provides old data, access cache directly, as
# caddy has to be stopped
try:
# stop caddy, to have error on while connecting to the backend
caddy_process_name = [
':'.join([q['group'], q['name']]) for q in
self.getSupervisorRPCServer().supervisor.getAllProcessInfo()
if 'caddy' in q['name'] and 'on-watch' in q['name']][0]
self.getSupervisorRPCServer().supervisor.stopProcess(caddy_process_name)
# sanity check: see that it is impossible to connect to caddy
with self.assertRaises(requests.ConnectionError):
self.fakeHTTPResult(
parameter_dict['domain'], parameter_dict['public-ipv4'],
'test-path/deep/.././deeper', headers={
'X-Reply-Header-Cache-Control': 'max-age=1, stale-while-'
'revalidate=3600, stale-if-error=3600'})
result = self.fakeHTTPResult(
parameter_dict['domain'], parameter_dict['public-ipv4'],
'test-path/deeper', # simple path, as ATS can't change them
port=23432, headers={
'X-Reply-Header-Cache-Control': 'max-age=1, stale-while-'
'revalidate=3600, stale-if-error=3600'})
self.assertEqual(result.status_code, httplib.OK)
self.assertEqualResultJson(result, 'Path', '/test-path/deeper')
headers = result.headers.copy()
self.assertKeyWithPop('Server', headers)
self.assertKeyWithPop('Date', headers)
self.assertKeyWithPop('Age', headers)
# drop keys appearing randomly in headers
headers.pop('Transfer-Encoding', None)
headers.pop('Content-Length', None)
headers.pop('Connection', None)
headers.pop('Keep-Alive', None)
self.assertEqual(
{
'Content-type': 'application/json',
# ATS does not cache the cookied text content, see:
# https://docs.trafficserver.apache.org/en/7.1.x/admin-guide/\
# configuration/cache-basics.en.html#caching-cookied-objects
# 'Set-Cookie': 'secured=value;secure, nonsecured=value',
'Cache-Control': 'max-age=1, stale-while-revalidate=3600, '
'stale-if-error=3600',
'Warning': '111 ApacheTrafficServer/7.1.6'
},
headers
)
backend_headers = result.json()['Incoming Headers']
via = backend_headers.pop('via', None)
self.assertNotEqual(via, None)
self.assertRegexpMatches(
via,
r'^http\/1.1 caddy-frontend-1\[.*\] \(ApacheTrafficServer\/7.1.6\)$'
)
finally:
self.getSupervisorRPCServer().supervisor.startProcess(caddy_process_name)
time.sleep(2) # give few moments for caddy to start
# END: check stale-if-error support
result_direct = self.fakeHTTPResult(
parameter_dict['domain'], parameter_dict['public-ipv4'], 'test-path',
port=26011)
......
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