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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Single threaded tests of UrlInfo functionality.
#include <time.h>
#include <string>
#include "base/threading/platform_thread.h"
#include "base/time.h"
#include "chrome/browser/net/url_info.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::TimeDelta;
using base::TimeTicks;
namespace {
class UrlHostInfoTest : public testing::Test {
};
typedef chrome_browser_net::UrlInfo UrlInfo;
// Cycle throught the states held by a UrlInfo instance, and check to see that
// states look reasonable as time ticks away. If the test bots are too slow,
// we'll just give up on this test and exit from it.
TEST(UrlHostInfoTest, StateChangeTest) {
UrlInfo info_practice, info;
GURL url1("http://domain1.com:80"), url2("https://domain2.com:443");
// First load DLL, so that their load time won't interfere with tests.
// Some tests involve timing function performance, and DLL time can overwhelm
// test durations (which are considering network vs cache response times).
info_practice.SetUrl(url2);
info_practice.SetQueuedState(UrlInfo::UNIT_TEST_MOTIVATED);
info_practice.SetAssignedState();
info_practice.SetFoundState();
// Start test with actual (long/default) expiration time intact.
// Complete the construction of real test object.
info.SetUrl(url1);
EXPECT_TRUE(info.NeedsDnsUpdate()) << "error in construction state";
info.SetQueuedState(UrlInfo::UNIT_TEST_MOTIVATED);
EXPECT_FALSE(info.NeedsDnsUpdate()) << "update needed after being queued";
info.SetAssignedState();
EXPECT_FALSE(info.NeedsDnsUpdate()) << "update needed during resolution";
base::TimeTicks before_resolution_complete = TimeTicks::Now();
info.SetFoundState();
// "Immediately" check to see if we need an update yet (we shouldn't).
if (info.NeedsDnsUpdate()) {
// The test bot must be really slow, so we can verify that.
EXPECT_GT((TimeTicks::Now() - before_resolution_complete).InMilliseconds(),
UrlInfo::get_cache_expiration().InMilliseconds());
return; // Lets punt here, the test bot is too slow.
}
// Run similar test with a shortened expiration, so we can trigger it.
const TimeDelta kMockExpirationTime = TimeDelta::FromMilliseconds(300);
info.set_cache_expiration(kMockExpirationTime);
// That was a nice life when the object was found.... but next time it won't
// be found. We'll sleep for a while, and then come back with not-found.
info.SetQueuedState(UrlInfo::UNIT_TEST_MOTIVATED);
EXPECT_FALSE(info.NeedsDnsUpdate());
info.SetAssignedState();
EXPECT_FALSE(info.NeedsDnsUpdate());
// Greater than minimal expected network latency on DNS lookup.
base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(25));
before_resolution_complete = TimeTicks::Now();
info.SetNoSuchNameState();
// "Immediately" check to see if we need an update yet (we shouldn't).
if (info.NeedsDnsUpdate()) {
// The test bot must be really slow, so we can verify that.
EXPECT_GT((TimeTicks::Now() - before_resolution_complete),
kMockExpirationTime);
return;
}
// Wait over 300ms, so it should definately be considered out of cache.
base::PlatformThread::Sleep(kMockExpirationTime +
TimeDelta::FromMilliseconds(20));
EXPECT_TRUE(info.NeedsDnsUpdate()) << "expiration time not honored";
}
// When a system gets "congested" relative to DNS, it means it is doing too many
// DNS resolutions, and bogging down the system. When we detect such a
// situation, we divert the sequence of states a UrlInfo instance moves
// through. Rather than proceeding from QUEUED (waiting in a name queue for a
// worker thread that can resolve the name) to ASSIGNED (where a worker thread
// actively resolves the name), we enter the ASSIGNED state (without actually
// getting sent to a resolver thread) and reset our state to what it was before
// the corresponding name was put in the work_queue_. This test drives through
// the state transitions used in such congestion handling.
TEST(UrlHostInfoTest, CongestionResetStateTest) {
UrlInfo info;
GURL url("http://domain1.com:80");
info.SetUrl(url);
info.SetQueuedState(UrlInfo::UNIT_TEST_MOTIVATED);
info.SetAssignedState();
EXPECT_TRUE(info.is_assigned());
info.RemoveFromQueue(); // Do the reset.
EXPECT_FALSE(info.is_assigned());
// Since this was a new info instance, and it never got resolved, we land back
// in a PENDING state rather than FOUND or NO_SUCH_NAME.
EXPECT_FALSE(info.was_found());
EXPECT_FALSE(info.was_nonexistent());
// Make sure we're completely re-usable, by going throug a normal flow.
info.SetQueuedState(UrlInfo::UNIT_TEST_MOTIVATED);
info.SetAssignedState();
info.SetFoundState();
EXPECT_TRUE(info.was_found());
// Use the congestion flow, and check that we end up in the found state.
info.SetQueuedState(UrlInfo::UNIT_TEST_MOTIVATED);
info.SetAssignedState();
info.RemoveFromQueue(); // Do the reset.
EXPECT_FALSE(info.is_assigned());
EXPECT_TRUE(info.was_found()); // Back to what it was before being queued.
}
// TODO(jar): Add death test for illegal state changes, and also for setting
// hostname when already set.
} // namespace
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