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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.
#include "net/base/host_resolver_impl.h"
#include <algorithm>
#include <string>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "base/message_loop.h"
#include "base/string_util.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
#include "base/test/test_timeouts.h"
#include "base/time.h"
#include "net/base/address_list.h"
#include "net/base/host_cache.h"
#include "net/base/mock_host_resolver.h"
#include "net/base/net_errors.h"
#include "net/base/net_util.h"
#include "net/dns/dns_client.h"
#include "net/dns/dns_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
const size_t kMaxJobs = 10u;
const size_t kMaxRetryAttempts = 4u;
PrioritizedDispatcher::Limits DefaultLimits() {
PrioritizedDispatcher::Limits limits(NUM_PRIORITIES, kMaxJobs);
return limits;
}
HostResolverImpl::ProcTaskParams DefaultParams(
HostResolverProc* resolver_proc) {
return HostResolverImpl::ProcTaskParams(resolver_proc, kMaxRetryAttempts);
}
HostResolverImpl* CreateHostResolverImpl(HostResolverProc* resolver_proc) {
return new HostResolverImpl(
HostCache::CreateDefaultCache(),
DefaultLimits(),
DefaultParams(resolver_proc),
scoped_ptr<DnsConfigService>(NULL),
NULL);
}
HostResolverImpl* CreateHostResolverImplWithDnsConfig(
HostResolverProc* resolver_proc,
scoped_ptr<DnsConfigService> config_service) {
return new HostResolverImpl(
HostCache::CreateDefaultCache(),
DefaultLimits(),
DefaultParams(resolver_proc),
config_service.Pass(),
NULL);
}
// This HostResolverImpl will only allow 1 outstanding resolve at a time.
HostResolverImpl* CreateSerialHostResolverImpl(
HostResolverProc* resolver_proc) {
HostResolverImpl::ProcTaskParams params = DefaultParams(resolver_proc);
params.max_retry_attempts = 0u;
PrioritizedDispatcher::Limits limits(NUM_PRIORITIES, 1);
return new HostResolverImpl(
HostCache::CreateDefaultCache(),
limits,
params,
scoped_ptr<DnsConfigService>(NULL),
NULL);
}
// A HostResolverProc that pushes each host mapped into a list and allows
// waiting for a specific number of requests. Unlike RuleBasedHostResolverProc
// it never calls SystemHostResolverProc. By default resolves all hostnames to
// "127.0.0.1". After AddRule(), it resolves only names explicitly specified.
class MockHostResolverProc : public HostResolverProc {
public:
struct ResolveKey {
ResolveKey(const std::string& hostname, AddressFamily address_family)
: hostname(hostname), address_family(address_family) {}
bool operator<(const ResolveKey& other) const {
return address_family < other.address_family ||
(address_family == other.address_family && hostname < other.hostname);
}
std::string hostname;
AddressFamily address_family;
};
typedef std::vector<ResolveKey> CaptureList;
MockHostResolverProc()
: HostResolverProc(NULL),
num_requests_waiting_(0),
num_slots_available_(0),
requests_waiting_(&lock_),
slots_available_(&lock_) {
}
// Waits until |count| calls to |Resolve| are blocked. Returns false when
// timed out.
bool WaitFor(unsigned count) {
base::AutoLock lock(lock_);
base::Time start_time = base::Time::Now();
while (num_requests_waiting_ < count) {
requests_waiting_.TimedWait(TestTimeouts::action_timeout());
if (base::Time::Now() > start_time + TestTimeouts::action_timeout())
return false;
}
return true;
}
// Signals |count| waiting calls to |Resolve|. First come first served.
void SignalMultiple(unsigned count) {
base::AutoLock lock(lock_);
num_slots_available_ += count;
slots_available_.Broadcast();
}
// Signals all waiting calls to |Resolve|. Beware of races.
void SignalAll() {
base::AutoLock lock(lock_);
num_slots_available_ = num_requests_waiting_;
slots_available_.Broadcast();
}
void AddRule(const std::string& hostname, AddressFamily family,
const AddressList& result) {
base::AutoLock lock(lock_);
rules_[ResolveKey(hostname, family)] = result;
}
void AddRule(const std::string& hostname, AddressFamily family,
const std::string& ip_list) {
AddressList result;
int rv = ParseAddressList(ip_list, "", &result);
DCHECK_EQ(OK, rv);
AddRule(hostname, family, result);
}
void AddRuleForAllFamilies(const std::string& hostname,
const std::string& ip_list) {
AddressList result;
int rv = ParseAddressList(ip_list, "", &result);
DCHECK_EQ(OK, rv);
AddRule(hostname, ADDRESS_FAMILY_UNSPECIFIED, result);
AddRule(hostname, ADDRESS_FAMILY_IPV4, result);
AddRule(hostname, ADDRESS_FAMILY_IPV6, result);
}
virtual int Resolve(const std::string& hostname,
AddressFamily address_family,
HostResolverFlags host_resolver_flags,
AddressList* addrlist,
int* os_error) OVERRIDE {
base::AutoLock lock(lock_);
capture_list_.push_back(ResolveKey(hostname, address_family));
++num_requests_waiting_;
requests_waiting_.Broadcast();
while (!num_slots_available_)
slots_available_.Wait();
DCHECK_GT(num_requests_waiting_, 0u);
--num_slots_available_;
--num_requests_waiting_;
if (rules_.empty()) {
int rv = ParseAddressList("127.0.0.1", "", addrlist);
DCHECK_EQ(OK, rv);
return OK;
}
ResolveKey key(hostname, address_family);
if (rules_.count(key) == 0)
return ERR_NAME_NOT_RESOLVED;
*addrlist = rules_[key];
return OK;
}
CaptureList GetCaptureList() const {
CaptureList copy;
{
base::AutoLock lock(lock_);
copy = capture_list_;
}
return copy;
}
bool HasBlockedRequests() const {
base::AutoLock lock(lock_);
return num_requests_waiting_ > num_slots_available_;
}
protected:
~MockHostResolverProc() {}
private:
mutable base::Lock lock_;
std::map<ResolveKey, AddressList> rules_;
CaptureList capture_list_;
unsigned num_requests_waiting_;
unsigned num_slots_available_;
base::ConditionVariable requests_waiting_;
base::ConditionVariable slots_available_;
DISALLOW_COPY_AND_ASSIGN(MockHostResolverProc);
};
// A wrapper for requests to a HostResolver.
class Request {
public:
// Base class of handlers to be executed on completion of requests.
struct Handler {
virtual ~Handler() {}
virtual void Handle(Request* request) = 0;
};
Request(const HostResolver::RequestInfo& info,
size_t index,
HostResolver* resolver,
Handler* handler)
: info_(info),
index_(index),
resolver_(resolver),
handler_(handler),
quit_on_complete_(false),
result_(ERR_UNEXPECTED),
handle_(NULL) {}
int Resolve() {
DCHECK(resolver_);
DCHECK(!handle_);
list_ = AddressList();
result_ = resolver_->Resolve(
info_, &list_, base::Bind(&Request::OnComplete, base::Unretained(this)),
&handle_, BoundNetLog());
if (!list_.empty())
EXPECT_EQ(OK, result_);
return result_;
}
int ResolveFromCache() {
DCHECK(resolver_);
DCHECK(!handle_);
return resolver_->ResolveFromCache(info_, &list_, BoundNetLog());
}
void Cancel() {
DCHECK(resolver_);
DCHECK(handle_);
resolver_->CancelRequest(handle_);
handle_ = NULL;
}
const HostResolver::RequestInfo& info() const { return info_; }
size_t index() const { return index_; }
const AddressList& list() const { return list_; }
int result() const { return result_; }
bool completed() const { return result_ != ERR_IO_PENDING; }
bool pending() const { return handle_ != NULL; }
bool HasAddress(const std::string& address, int port) const {
IPAddressNumber ip;
bool rv = ParseIPLiteralToNumber(address, &ip);
DCHECK(rv);
return std::find(list_.begin(),
list_.end(),
IPEndPoint(ip, port)) != list_.end();
}
// Returns the number of addresses in |list_|.
unsigned NumberOfAddresses() const {
return list_.size();
}
bool HasOneAddress(const std::string& address, int port) const {
return HasAddress(address, port) && (NumberOfAddresses() == 1u);
}
// Returns ERR_UNEXPECTED if timed out.
int WaitForResult() {
if (completed())
return result_;
base::CancelableClosure closure(MessageLoop::QuitClosure());
MessageLoop::current()->PostDelayedTask(FROM_HERE,
closure.callback(),
TestTimeouts::action_max_timeout());
quit_on_complete_ = true;
MessageLoop::current()->Run();
bool did_quit = !quit_on_complete_;
quit_on_complete_ = false;
closure.Cancel();
if (did_quit)
return result_;
else
return ERR_UNEXPECTED;
}
private:
void OnComplete(int rv) {
EXPECT_TRUE(pending());
EXPECT_EQ(ERR_IO_PENDING, result_);
EXPECT_NE(ERR_IO_PENDING, rv);
result_ = rv;
handle_ = NULL;
if (!list_.empty()) {
EXPECT_EQ(OK, result_);
EXPECT_EQ(info_.port(), list_.front().port());
}
if (handler_)
handler_->Handle(this);
if (quit_on_complete_) {
MessageLoop::current()->Quit();
quit_on_complete_ = false;
}
}
HostResolver::RequestInfo info_;
size_t index_;
HostResolver* resolver_;
Handler* handler_;
bool quit_on_complete_;
AddressList list_;
int result_;
HostResolver::RequestHandle handle_;
DISALLOW_COPY_AND_ASSIGN(Request);
};
// Using LookupAttemptHostResolverProc simulate very long lookups, and control
// which attempt resolves the host.
class LookupAttemptHostResolverProc : public HostResolverProc {
public:
LookupAttemptHostResolverProc(HostResolverProc* previous,
int attempt_number_to_resolve,
int total_attempts)
: HostResolverProc(previous),
attempt_number_to_resolve_(attempt_number_to_resolve),
current_attempt_number_(0),
total_attempts_(total_attempts),
total_attempts_resolved_(0),
resolved_attempt_number_(0),
all_done_(&lock_) {
}
// Test harness will wait for all attempts to finish before checking the
// results.
void WaitForAllAttemptsToFinish(const base::TimeDelta& wait_time) {
base::TimeTicks end_time = base::TimeTicks::Now() + wait_time;
{
base::AutoLock auto_lock(lock_);
while (total_attempts_resolved_ != total_attempts_ &&
base::TimeTicks::Now() < end_time) {
all_done_.TimedWait(end_time - base::TimeTicks::Now());
}
}
}
// All attempts will wait for an attempt to resolve the host.
void WaitForAnAttemptToComplete() {
base::TimeDelta wait_time = base::TimeDelta::FromSeconds(60);
base::TimeTicks end_time = base::TimeTicks::Now() + wait_time;
{
base::AutoLock auto_lock(lock_);
while (resolved_attempt_number_ == 0 && base::TimeTicks::Now() < end_time)
all_done_.TimedWait(end_time - base::TimeTicks::Now());
}
all_done_.Broadcast(); // Tell all waiting attempts to proceed.
}
// Returns the number of attempts that have finished the Resolve() method.
int total_attempts_resolved() { return total_attempts_resolved_; }
// Returns the first attempt that that has resolved the host.
int resolved_attempt_number() { return resolved_attempt_number_; }
// HostResolverProc methods.
virtual int Resolve(const std::string& host,
AddressFamily address_family,
HostResolverFlags host_resolver_flags,
AddressList* addrlist,
int* os_error) OVERRIDE {
bool wait_for_right_attempt_to_complete = true;
{
base::AutoLock auto_lock(lock_);
++current_attempt_number_;
if (current_attempt_number_ == attempt_number_to_resolve_) {
resolved_attempt_number_ = current_attempt_number_;
wait_for_right_attempt_to_complete = false;
}
}
if (wait_for_right_attempt_to_complete)
// Wait for the attempt_number_to_resolve_ attempt to resolve.
WaitForAnAttemptToComplete();
int result = ResolveUsingPrevious(host, address_family, host_resolver_flags,
addrlist, os_error);
{
base::AutoLock auto_lock(lock_);
++total_attempts_resolved_;
}
all_done_.Broadcast(); // Tell all attempts to proceed.
// Since any negative number is considered a network error, with -1 having
// special meaning (ERR_IO_PENDING). We could return the attempt that has
// resolved the host as a negative number. For example, if attempt number 3
// resolves the host, then this method returns -4.
if (result == OK)
return -1 - resolved_attempt_number_;
else
return result;
}
protected:
virtual ~LookupAttemptHostResolverProc() {}
private:
int attempt_number_to_resolve_;
int current_attempt_number_; // Incremented whenever Resolve is called.
int total_attempts_;
int total_attempts_resolved_;
int resolved_attempt_number_;
// All attempts wait for right attempt to be resolve.
base::Lock lock_;
base::ConditionVariable all_done_;
};
} // namespace
class HostResolverImplTest : public testing::Test {
public:
static const int kDefaultPort = 80;
HostResolverImplTest()
: proc_(new MockHostResolverProc()),
resolver_(CreateHostResolverImpl(proc_)) {
}
protected:
// A Request::Handler which is a proxy to the HostResolverImplTest fixture.
struct Handler : public Request::Handler {
virtual ~Handler() {}
// Proxy functions so that classes derived from Handler can access them.
Request* CreateRequest(const HostResolver::RequestInfo& info) {
return test->CreateRequest(info);
}
Request* CreateRequest(const std::string& hostname, int port) {
return test->CreateRequest(hostname, port);
}
Request* CreateRequest(const std::string& hostname) {
return test->CreateRequest(hostname);
}
ScopedVector<Request>& requests() { return test->requests_; }
void DeleteResolver() { test->resolver_.reset(); }
HostResolverImplTest* test;
};
void CreateSerialResolver() {
resolver_.reset(CreateSerialHostResolverImpl(proc_));
}
// The Request will not be made until a call to |Resolve()|, and the Job will
// not start until released by |proc_->SignalXXX|.
Request* CreateRequest(const HostResolver::RequestInfo& info) {
Request* req = new Request(info, requests_.size(), resolver_.get(),
handler_.get());
requests_.push_back(req);
return req;
}
Request* CreateRequest(const std::string& hostname,
int port,
RequestPriority priority,
AddressFamily family) {
HostResolver::RequestInfo info(HostPortPair(hostname, port));
info.set_priority(priority);
info.set_address_family(family);
return CreateRequest(info);
}
Request* CreateRequest(const std::string& hostname,
int port,
RequestPriority priority) {
return CreateRequest(hostname, port, priority, ADDRESS_FAMILY_UNSPECIFIED);
}
Request* CreateRequest(const std::string& hostname, int port) {
return CreateRequest(hostname, port, MEDIUM);
}
Request* CreateRequest(const std::string& hostname) {
return CreateRequest(hostname, kDefaultPort);
}
void TearDown() OVERRIDE {
if (resolver_.get())
EXPECT_EQ(0u, resolver_->num_running_jobs_for_tests());
EXPECT_FALSE(proc_->HasBlockedRequests());
}
void set_handler(Handler* handler) {
handler_.reset(handler);
handler_->test = this;
}
// Friendship is not inherited, so use proxies to access those.
size_t num_running_jobs() const {
DCHECK(resolver_.get());
return resolver_->num_running_jobs_for_tests();
}
void set_dns_client(scoped_ptr<DnsClient> client) {
resolver_->set_dns_client_for_tests(client.Pass());
}
scoped_refptr<MockHostResolverProc> proc_;
scoped_ptr<HostResolverImpl> resolver_;
ScopedVector<Request> requests_;
scoped_ptr<Handler> handler_;
};
TEST_F(HostResolverImplTest, AsynchronousLookup) {
proc_->AddRuleForAllFamilies("just.testing", "192.168.1.42");
proc_->SignalMultiple(1u);
Request* req = CreateRequest("just.testing", 80);
EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
EXPECT_EQ(OK, req->WaitForResult());
EXPECT_TRUE(req->HasOneAddress("192.168.1.42", 80));
EXPECT_EQ("just.testing", proc_->GetCaptureList()[0].hostname);
}
TEST_F(HostResolverImplTest, FailedAsynchronousLookup) {
proc_->AddRuleForAllFamilies("", "0.0.0.0"); // Default to failures.
proc_->SignalMultiple(1u);
Request* req = CreateRequest("just.testing", 80);
EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, req->WaitForResult());
EXPECT_EQ("just.testing", proc_->GetCaptureList()[0].hostname);
// Also test that the error is not cached.
EXPECT_EQ(ERR_DNS_CACHE_MISS, req->ResolveFromCache());
}
TEST_F(HostResolverImplTest, AbortedAsynchronousLookup) {
Request* req0 = CreateRequest("just.testing", 80);
EXPECT_EQ(ERR_IO_PENDING, req0->Resolve());
EXPECT_TRUE(proc_->WaitFor(1u));
// Resolver is destroyed while job is running on WorkerPool.
resolver_.reset();
proc_->SignalAll();
// To ensure there was no spurious callback, complete with a new resolver.
resolver_.reset(CreateHostResolverImpl(proc_));
Request* req1 = CreateRequest("just.testing", 80);
EXPECT_EQ(ERR_IO_PENDING, req1->Resolve());
proc_->SignalMultiple(2u);
EXPECT_EQ(OK, req1->WaitForResult());
// This request was canceled.
EXPECT_FALSE(req0->completed());
}
TEST_F(HostResolverImplTest, NumericIPv4Address) {
// Stevens says dotted quads with AI_UNSPEC resolve to a single sockaddr_in.
Request* req = CreateRequest("127.1.2.3", 5555);
EXPECT_EQ(OK, req->Resolve());
EXPECT_TRUE(req->HasOneAddress("127.1.2.3", 5555));
}
TEST_F(HostResolverImplTest, NumericIPv6Address) {
// Resolve a plain IPv6 address. Don't worry about [brackets], because
// the caller should have removed them.
Request* req = CreateRequest("2001:db8::1", 5555);
EXPECT_EQ(OK, req->Resolve());
EXPECT_TRUE(req->HasOneAddress("2001:db8::1", 5555));
}
TEST_F(HostResolverImplTest, EmptyHost) {
Request* req = CreateRequest("", 5555);
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, req->Resolve());
}
TEST_F(HostResolverImplTest, LongHost) {
Request* req = CreateRequest(std::string(4097, 'a'), 5555);
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, req->Resolve());
}
TEST_F(HostResolverImplTest, DeDupeRequests) {
// Start 5 requests, duplicating hosts "a" and "b". Since the resolver_proc is
// blocked, these should all pile up until we signal it.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 81)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 82)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 83)->Resolve());
proc_->SignalMultiple(2u); // One for "a", one for "b".
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_EQ(OK, requests_[i]->WaitForResult()) << i;
}
}
TEST_F(HostResolverImplTest, CancelMultipleRequests) {
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 81)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 82)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 83)->Resolve());
// Cancel everything except request for ("a", 82).
requests_[0]->Cancel();
requests_[1]->Cancel();
requests_[2]->Cancel();
requests_[4]->Cancel();
proc_->SignalMultiple(2u); // One for "a", one for "b".
EXPECT_EQ(OK, requests_[3]->WaitForResult());
}
TEST_F(HostResolverImplTest, CanceledRequestsReleaseJobSlots) {
// Fill up the dispatcher and queue.
for (unsigned i = 0; i < kMaxJobs + 1; ++i) {
std::string hostname = "a_";
hostname[1] = 'a' + i;
EXPECT_EQ(ERR_IO_PENDING, CreateRequest(hostname, 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest(hostname, 81)->Resolve());
}
EXPECT_TRUE(proc_->WaitFor(kMaxJobs));
// Cancel all but last two.
for (unsigned i = 0; i < requests_.size() - 2; ++i) {
requests_[i]->Cancel();
}
EXPECT_TRUE(proc_->WaitFor(kMaxJobs + 1));
proc_->SignalAll();
size_t num_requests = requests_.size();
EXPECT_EQ(OK, requests_[num_requests - 1]->WaitForResult());
EXPECT_EQ(OK, requests_[num_requests - 2]->result());
}
TEST_F(HostResolverImplTest, CancelWithinCallback) {
struct MyHandler : public Handler {
virtual void Handle(Request* req) OVERRIDE {
// Port 80 is the first request that the callback will be invoked for.
// While we are executing within that callback, cancel the other requests
// in the job and start another request.
if (req->index() == 0) {
// Once "a:80" completes, it will cancel "a:81" and "a:82".
requests()[1]->Cancel();
requests()[2]->Cancel();
}
}
};
set_handler(new MyHandler());
for (size_t i = 0; i < 4; ++i) {
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80 + i)->Resolve()) << i;
}
proc_->SignalMultiple(2u); // One for "a". One for "finalrequest".
EXPECT_EQ(OK, requests_[0]->WaitForResult());
Request* final_request = CreateRequest("finalrequest", 70);
EXPECT_EQ(ERR_IO_PENDING, final_request->Resolve());
EXPECT_EQ(OK, final_request->WaitForResult());
EXPECT_TRUE(requests_[3]->completed());
}
TEST_F(HostResolverImplTest, DeleteWithinCallback) {
struct MyHandler : public Handler {
virtual void Handle(Request* req) OVERRIDE {
EXPECT_EQ("a", req->info().hostname());
EXPECT_EQ(80, req->info().port());
DeleteResolver();
// Quit after returning from OnCompleted (to give it a chance at
// incorrectly running the cancelled tasks).
MessageLoop::current()->PostTask(FROM_HERE, MessageLoop::QuitClosure());
}
};
set_handler(new MyHandler());
for (size_t i = 0; i < 4; ++i) {
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80 + i)->Resolve()) << i;
}
proc_->SignalMultiple(1u); // One for "a".
// |MyHandler| will send quit message once all the requests have finished.
MessageLoop::current()->Run();
}
TEST_F(HostResolverImplTest, DeleteWithinAbortedCallback) {
struct MyHandler : public Handler {
virtual void Handle(Request* req) OVERRIDE {
EXPECT_EQ("a", req->info().hostname());
EXPECT_EQ(80, req->info().port());
DeleteResolver();
// Quit after returning from OnCompleted (to give it a chance at
// incorrectly running the cancelled tasks).
MessageLoop::current()->PostTask(FROM_HERE, MessageLoop::QuitClosure());
}
};
set_handler(new MyHandler());
// This test assumes that the Jobs will be Aborted in order ["a", "b"]
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80)->Resolve());
// HostResolverImpl will be deleted before later Requests can complete.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 81)->Resolve());
// Job for 'b' will be aborted before it can complete.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 82)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b", 83)->Resolve());
EXPECT_TRUE(proc_->WaitFor(1u));
// Triggering an IP address change.
NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests();
// |MyHandler| will send quit message once all the requests have finished.
MessageLoop::current()->Run();
EXPECT_EQ(ERR_ABORTED, requests_[0]->result());
EXPECT_EQ(ERR_IO_PENDING, requests_[1]->result());
EXPECT_EQ(ERR_IO_PENDING, requests_[2]->result());
EXPECT_EQ(ERR_IO_PENDING, requests_[3]->result());
// Clean up.
proc_->SignalMultiple(requests_.size());
}
TEST_F(HostResolverImplTest, StartWithinCallback) {
struct MyHandler : public Handler {
virtual void Handle(Request* req) OVERRIDE {
if (req->index() == 0) {
// On completing the first request, start another request for "a".
// Since caching is disabled, this will result in another async request.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 70)->Resolve());
}
}
};
set_handler(new MyHandler());
// Turn off caching for this host resolver.
resolver_.reset(new HostResolverImpl(
NULL,
DefaultLimits(),
DefaultParams(proc_),
scoped_ptr<DnsConfigService>(NULL),
NULL));
for (size_t i = 0; i < 4; ++i) {
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80 + i)->Resolve()) << i;
}
proc_->SignalMultiple(2u); // One for "a". One for the second "a".
EXPECT_EQ(OK, requests_[0]->WaitForResult());
ASSERT_EQ(5u, requests_.size());
EXPECT_EQ(OK, requests_->back()->WaitForResult());
EXPECT_EQ(2u, proc_->GetCaptureList().size());
}
TEST_F(HostResolverImplTest, BypassCache) {
struct MyHandler : public Handler {
virtual void Handle(Request* req) OVERRIDE {
if (req->index() == 0) {
// On completing the first request, start another request for "a".
// Since caching is enabled, this should complete synchronously.
std::string hostname = req->info().hostname();
EXPECT_EQ(OK, CreateRequest(hostname, 70)->Resolve());
EXPECT_EQ(OK, CreateRequest(hostname, 75)->ResolveFromCache());
// Ok good. Now make sure that if we ask to bypass the cache, it can no
// longer service the request synchronously.
HostResolver::RequestInfo info(HostPortPair(hostname, 71));
info.set_allow_cached_response(false);
EXPECT_EQ(ERR_IO_PENDING, CreateRequest(info)->Resolve());
} else if (71 == req->info().port()) {
// Test is done.
MessageLoop::current()->Quit();
} else {
FAIL() << "Unexpected request";
}
}
};
set_handler(new MyHandler());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a", 80)->Resolve());
proc_->SignalMultiple(3u); // Only need two, but be generous.
// |verifier| will send quit message once all the requests have finished.
MessageLoop::current()->Run();
EXPECT_EQ(2u, proc_->GetCaptureList().size());
}
// Test that IP address changes flush the cache.
TEST_F(HostResolverImplTest, FlushCacheOnIPAddressChange) {
proc_->SignalMultiple(2u); // One before the flush, one after.
Request* req = CreateRequest("host1", 70);
EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
EXPECT_EQ(OK, req->WaitForResult());
req = CreateRequest("host1", 75);
EXPECT_EQ(OK, req->Resolve()); // Should complete synchronously.
// Flush cache by triggering an IP address change.
NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests();
MessageLoop::current()->RunAllPending(); // Notification happens async.
// Resolve "host1" again -- this time it won't be served from cache, so it
// will complete asynchronously.
req = CreateRequest("host1", 80);
EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
EXPECT_EQ(OK, req->WaitForResult());
}
// Test that IP address changes send ERR_ABORTED to pending requests.
TEST_F(HostResolverImplTest, AbortOnIPAddressChanged) {
Request* req = CreateRequest("host1", 70);
EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
EXPECT_TRUE(proc_->WaitFor(1u));
// Triggering an IP address change.
NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests();
MessageLoop::current()->RunAllPending(); // Notification happens async.
proc_->SignalAll();
EXPECT_EQ(ERR_ABORTED, req->WaitForResult());
EXPECT_EQ(0u, resolver_->GetHostCache()->size());
}
// Obey pool constraints after IP address has changed.
TEST_F(HostResolverImplTest, ObeyPoolConstraintsAfterIPAddressChange) {
// Runs at most one job at a time.
CreateSerialResolver();
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("a")->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("b")->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("c")->Resolve());
EXPECT_TRUE(proc_->WaitFor(1u));
// Triggering an IP address change.
NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests();
MessageLoop::current()->RunAllPending(); // Notification happens async.
proc_->SignalMultiple(3u); // Let the false-start go so that we can catch it.
EXPECT_EQ(ERR_ABORTED, requests_[0]->WaitForResult());
EXPECT_EQ(1u, num_running_jobs());
EXPECT_FALSE(requests_[1]->completed());
EXPECT_FALSE(requests_[2]->completed());
EXPECT_EQ(OK, requests_[2]->WaitForResult());
EXPECT_EQ(OK, requests_[1]->result());
}
// Tests that a new Request made from the callback of a previously aborted one
// will not be aborted.
TEST_F(HostResolverImplTest, AbortOnlyExistingRequestsOnIPAddressChange) {
struct MyHandler : public Handler {
virtual void Handle(Request* req) OVERRIDE {
// Start new request for a different hostname to ensure that the order
// of jobs in HostResolverImpl is not stable.
std::string hostname;
if (req->index() == 0)
hostname = "zzz";
else if (req->index() == 1)
hostname = "aaa";
else if (req->index() == 2)
hostname = "eee";
else
return; // A request started from within MyHandler.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest(hostname)->Resolve()) << hostname;
}
};
set_handler(new MyHandler());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("bbb")->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("eee")->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("ccc")->Resolve());
// Wait until all are blocked;
EXPECT_TRUE(proc_->WaitFor(3u));
// Trigger an IP address change.
NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests();
// This should abort all running jobs.
MessageLoop::current()->RunAllPending();
EXPECT_EQ(ERR_ABORTED, requests_[0]->result());
EXPECT_EQ(ERR_ABORTED, requests_[1]->result());
EXPECT_EQ(ERR_ABORTED, requests_[2]->result());
ASSERT_EQ(6u, requests_.size());
// Unblock all calls to proc.
proc_->SignalMultiple(requests_.size());
// Run until the re-started requests finish.
EXPECT_EQ(OK, requests_[3]->WaitForResult());
EXPECT_EQ(OK, requests_[4]->WaitForResult());
EXPECT_EQ(OK, requests_[5]->WaitForResult());
// Verify that results of aborted Jobs were not cached.
EXPECT_EQ(6u, proc_->GetCaptureList().size());
EXPECT_EQ(3u, resolver_->GetHostCache()->size());
}
// Tests that when the maximum threads is set to 1, requests are dequeued
// in order of priority.
TEST_F(HostResolverImplTest, HigherPriorityRequestsStartedFirst) {
CreateSerialResolver();
// Note that at this point the MockHostResolverProc is blocked, so any
// requests we make will not complete.
CreateRequest("req0", 80, LOW);
CreateRequest("req1", 80, MEDIUM);
CreateRequest("req2", 80, MEDIUM);
CreateRequest("req3", 80, LOW);
CreateRequest("req4", 80, HIGHEST);
CreateRequest("req5", 80, LOW);
CreateRequest("req6", 80, LOW);
CreateRequest("req5", 80, HIGHEST);
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_EQ(ERR_IO_PENDING, requests_[i]->Resolve()) << i;
}
// Unblock the resolver thread so the requests can run.
proc_->SignalMultiple(requests_.size()); // More than needed.
// Wait for all the requests to complete succesfully.
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_EQ(OK, requests_[i]->WaitForResult()) << i;
}
// Since we have restricted to a single concurrent thread in the jobpool,
// the requests should complete in order of priority (with the exception
// of the first request, which gets started right away, since there is
// nothing outstanding).
MockHostResolverProc::CaptureList capture_list = proc_->GetCaptureList();
ASSERT_EQ(7u, capture_list.size());
EXPECT_EQ("req0", capture_list[0].hostname);
EXPECT_EQ("req4", capture_list[1].hostname);
EXPECT_EQ("req5", capture_list[2].hostname);
EXPECT_EQ("req1", capture_list[3].hostname);
EXPECT_EQ("req2", capture_list[4].hostname);
EXPECT_EQ("req3", capture_list[5].hostname);
EXPECT_EQ("req6", capture_list[6].hostname);
}
// Try cancelling a job which has not started yet.
TEST_F(HostResolverImplTest, CancelPendingRequest) {
CreateSerialResolver();
CreateRequest("req0", 80, LOWEST);
CreateRequest("req1", 80, HIGHEST); // Will cancel.
CreateRequest("req2", 80, MEDIUM);
CreateRequest("req3", 80, LOW);
CreateRequest("req4", 80, HIGHEST); // Will cancel.
CreateRequest("req5", 80, LOWEST); // Will cancel.
CreateRequest("req6", 80, MEDIUM);
// Start all of the requests.
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_EQ(ERR_IO_PENDING, requests_[i]->Resolve()) << i;
}
// Cancel some requests
requests_[1]->Cancel();
requests_[4]->Cancel();
requests_[5]->Cancel();
// Unblock the resolver thread so the requests can run.
proc_->SignalMultiple(requests_.size()); // More than needed.
// Wait for all the requests to complete succesfully.
for (size_t i = 0; i < requests_.size(); ++i) {
if (!requests_[i]->pending())
continue; // Don't wait for the requests we cancelled.
EXPECT_EQ(OK, requests_[i]->WaitForResult()) << i;
}
// Verify that they called out the the resolver proc (which runs on the
// resolver thread) in the expected order.
MockHostResolverProc::CaptureList capture_list = proc_->GetCaptureList();
ASSERT_EQ(4u, capture_list.size());
EXPECT_EQ("req0", capture_list[0].hostname);
EXPECT_EQ("req2", capture_list[1].hostname);
EXPECT_EQ("req6", capture_list[2].hostname);
EXPECT_EQ("req3", capture_list[3].hostname);
}
// Test that when too many requests are enqueued, old ones start to be aborted.
TEST_F(HostResolverImplTest, QueueOverflow) {
CreateSerialResolver();
// Allow only 3 queued jobs.
const size_t kMaxPendingJobs = 3u;
resolver_->SetMaxQueuedJobs(kMaxPendingJobs);
// Note that at this point the MockHostResolverProc is blocked, so any
// requests we make will not complete.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req0", 80, LOWEST)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req1", 80, HIGHEST)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req2", 80, MEDIUM)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req3", 80, MEDIUM)->Resolve());
// At this point, there are 3 enqueued jobs.
// Insertion of subsequent requests will cause evictions
// based on priority.
EXPECT_EQ(ERR_HOST_RESOLVER_QUEUE_TOO_LARGE,
CreateRequest("req4", 80, LOW)->Resolve()); // Evicts itself!
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req5", 80, MEDIUM)->Resolve());
EXPECT_EQ(ERR_HOST_RESOLVER_QUEUE_TOO_LARGE, requests_[2]->result());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req6", 80, HIGHEST)->Resolve());
EXPECT_EQ(ERR_HOST_RESOLVER_QUEUE_TOO_LARGE, requests_[3]->result());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("req7", 80, MEDIUM)->Resolve());
EXPECT_EQ(ERR_HOST_RESOLVER_QUEUE_TOO_LARGE, requests_[5]->result());
// Unblock the resolver thread so the requests can run.
proc_->SignalMultiple(4u);
// The rest should succeed.
EXPECT_EQ(OK, requests_[7]->WaitForResult());
EXPECT_EQ(OK, requests_[0]->result());
EXPECT_EQ(OK, requests_[1]->result());
EXPECT_EQ(OK, requests_[6]->result());
// Verify that they called out the the resolver proc (which runs on the
// resolver thread) in the expected order.
MockHostResolverProc::CaptureList capture_list = proc_->GetCaptureList();
ASSERT_EQ(4u, capture_list.size());
EXPECT_EQ("req0", capture_list[0].hostname);
EXPECT_EQ("req1", capture_list[1].hostname);
EXPECT_EQ("req6", capture_list[2].hostname);
EXPECT_EQ("req7", capture_list[3].hostname);
// Verify that the evicted (incomplete) requests were not cached.
EXPECT_EQ(4u, resolver_->GetHostCache()->size());
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_TRUE(requests_[i]->completed()) << i;
}
}
// Tests that after changing the default AddressFamily to IPV4, requests
// with UNSPECIFIED address family map to IPV4.
TEST_F(HostResolverImplTest, SetDefaultAddressFamily_IPv4) {
CreateSerialResolver(); // To guarantee order of resolutions.
proc_->AddRule("h1", ADDRESS_FAMILY_IPV4, "1.0.0.1");
proc_->AddRule("h1", ADDRESS_FAMILY_IPV6, "::2");
resolver_->SetDefaultAddressFamily(ADDRESS_FAMILY_IPV4);
CreateRequest("h1", 80, MEDIUM, ADDRESS_FAMILY_UNSPECIFIED);
CreateRequest("h1", 80, MEDIUM, ADDRESS_FAMILY_IPV4);
CreateRequest("h1", 80, MEDIUM, ADDRESS_FAMILY_IPV6);
// Start all of the requests.
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_EQ(ERR_IO_PENDING, requests_[i]->Resolve()) << i;
}
proc_->SignalMultiple(requests_.size());
// Wait for all the requests to complete.
for (size_t i = 0u; i < requests_.size(); ++i) {
EXPECT_EQ(OK, requests_[i]->WaitForResult()) << i;
}
// Since the requests all had the same priority and we limited the thread
// count to 1, they should have completed in the same order as they were
// requested. Moreover, request0 and request1 will have been serviced by
// the same job.
MockHostResolverProc::CaptureList capture_list = proc_->GetCaptureList();
ASSERT_EQ(2u, capture_list.size());
EXPECT_EQ("h1", capture_list[0].hostname);
EXPECT_EQ(ADDRESS_FAMILY_IPV4, capture_list[0].address_family);
EXPECT_EQ("h1", capture_list[1].hostname);
EXPECT_EQ(ADDRESS_FAMILY_IPV6, capture_list[1].address_family);
// Now check that the correct resolved IP addresses were returned.
EXPECT_TRUE(requests_[0]->HasOneAddress("1.0.0.1", 80));
EXPECT_TRUE(requests_[1]->HasOneAddress("1.0.0.1", 80));
EXPECT_TRUE(requests_[2]->HasOneAddress("::2", 80));
}
// This is the exact same test as SetDefaultAddressFamily_IPv4, except the
// default family is set to IPv6 and the family of requests is flipped where
// specified.
TEST_F(HostResolverImplTest, SetDefaultAddressFamily_IPv6) {
CreateSerialResolver(); // To guarantee order of resolutions.
// Don't use IPv6 replacements here since some systems don't support it.
proc_->AddRule("h1", ADDRESS_FAMILY_IPV4, "1.0.0.1");
proc_->AddRule("h1", ADDRESS_FAMILY_IPV6, "::2");
resolver_->SetDefaultAddressFamily(ADDRESS_FAMILY_IPV6);
CreateRequest("h1", 80, MEDIUM, ADDRESS_FAMILY_UNSPECIFIED);
CreateRequest("h1", 80, MEDIUM, ADDRESS_FAMILY_IPV6);
CreateRequest("h1", 80, MEDIUM, ADDRESS_FAMILY_IPV4);
// Start all of the requests.
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_EQ(ERR_IO_PENDING, requests_[i]->Resolve()) << i;
}
proc_->SignalMultiple(requests_.size());
// Wait for all the requests to complete.
for (size_t i = 0u; i < requests_.size(); ++i) {
EXPECT_EQ(OK, requests_[i]->WaitForResult()) << i;
}
// Since the requests all had the same priority and we limited the thread
// count to 1, they should have completed in the same order as they were
// requested. Moreover, request0 and request1 will have been serviced by
// the same job.
MockHostResolverProc::CaptureList capture_list = proc_->GetCaptureList();
ASSERT_EQ(2u, capture_list.size());
EXPECT_EQ("h1", capture_list[0].hostname);
EXPECT_EQ(ADDRESS_FAMILY_IPV6, capture_list[0].address_family);
EXPECT_EQ("h1", capture_list[1].hostname);
EXPECT_EQ(ADDRESS_FAMILY_IPV4, capture_list[1].address_family);
// Now check that the correct resolved IP addresses were returned.
EXPECT_TRUE(requests_[0]->HasOneAddress("::2", 80));
EXPECT_TRUE(requests_[1]->HasOneAddress("::2", 80));
EXPECT_TRUE(requests_[2]->HasOneAddress("1.0.0.1", 80));
}
TEST_F(HostResolverImplTest, ResolveFromCache) {
proc_->AddRuleForAllFamilies("just.testing", "192.168.1.42");
proc_->SignalMultiple(1u); // Need only one.
HostResolver::RequestInfo info(HostPortPair("just.testing", 80));
// First hit will miss the cache.
EXPECT_EQ(ERR_DNS_CACHE_MISS, CreateRequest(info)->ResolveFromCache());
// This time, we fetch normally.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest(info)->Resolve());
EXPECT_EQ(OK, requests_[1]->WaitForResult());
// Now we should be able to fetch from the cache.
EXPECT_EQ(OK, CreateRequest(info)->ResolveFromCache());
EXPECT_TRUE(requests_[2]->HasOneAddress("192.168.1.42", 80));
}
// Test the retry attempts simulating host resolver proc that takes too long.
TEST_F(HostResolverImplTest, MultipleAttempts) {
// Total number of attempts would be 3 and we want the 3rd attempt to resolve
// the host. First and second attempt will be forced to sleep until they get
// word that a resolution has completed. The 3rd resolution attempt will try
// to get done ASAP, and won't sleep..
int kAttemptNumberToResolve = 3;
int kTotalAttempts = 3;
scoped_refptr<LookupAttemptHostResolverProc> resolver_proc(
new LookupAttemptHostResolverProc(
NULL, kAttemptNumberToResolve, kTotalAttempts));
HostResolverImpl::ProcTaskParams params = DefaultParams(resolver_proc.get());
// Specify smaller interval for unresponsive_delay_ for HostResolverImpl so
// that unit test runs faster. For example, this test finishes in 1.5 secs
// (500ms * 3).
params.unresponsive_delay = base::TimeDelta::FromMilliseconds(500);
resolver_.reset(
new HostResolverImpl(HostCache::CreateDefaultCache(),
DefaultLimits(),
params,
scoped_ptr<DnsConfigService>(NULL),
NULL));
// Resolve "host1".
HostResolver::RequestInfo info(HostPortPair("host1", 70));
Request* req = CreateRequest(info);
EXPECT_EQ(ERR_IO_PENDING, req->Resolve());
// Resolve returns -4 to indicate that 3rd attempt has resolved the host.
EXPECT_EQ(-4, req->WaitForResult());
resolver_proc->WaitForAllAttemptsToFinish(
base::TimeDelta::FromMilliseconds(60000));
MessageLoop::current()->RunAllPending();
EXPECT_EQ(resolver_proc->total_attempts_resolved(), kTotalAttempts);
EXPECT_EQ(resolver_proc->resolved_attempt_number(), kAttemptNumberToResolve);
}
DnsConfig CreateValidDnsConfig() {
IPAddressNumber dns_ip;
bool rv = ParseIPLiteralToNumber("192.168.1.0", &dns_ip);
EXPECT_TRUE(rv);
DnsConfig config;
config.nameservers.push_back(IPEndPoint(dns_ip, dns_protocol::kDefaultPort));
EXPECT_TRUE(config.IsValid());
return config;
}
// TODO(szym): Test AbortAllInProgressJobs due to DnsConfig change.
// TODO(cbentzel): Test a mix of requests with different HostResolverFlags.
// Test successful and fallback resolutions in HostResolverImpl::DnsTask.
TEST_F(HostResolverImplTest, DnsTask) {
proc_->AddRuleForAllFamilies("er_succeed", "192.168.1.101");
proc_->AddRuleForAllFamilies("nx_succeed", "192.168.1.102");
// All other hostnames will fail in proc_.
// Initially there is no config, so client should not be invoked.
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("ok_fail", 80)->Resolve());
proc_->SignalMultiple(requests_->size());
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, requests_[0]->WaitForResult());
set_dns_client(CreateMockDnsClient(CreateValidDnsConfig()));
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("ok_fail", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("er_fail", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("nx_fail", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("er_succeed", 80)->Resolve());
EXPECT_EQ(ERR_IO_PENDING, CreateRequest("nx_succeed", 80)->Resolve());
proc_->SignalMultiple(requests_.size());
for (size_t i = 0; i < requests_.size(); ++i) {
EXPECT_NE(ERR_UNEXPECTED, requests_[i]->WaitForResult()) << 1;
}
EXPECT_EQ(OK, requests_[1]->result());
// Resolved by MockDnsClient.
EXPECT_TRUE(requests_[1]->HasOneAddress("127.0.0.1", 80));
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, requests_[2]->result());
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, requests_[3]->result());
EXPECT_EQ(OK, requests_[4]->result());
EXPECT_TRUE(requests_[4]->HasOneAddress("192.168.1.101", 80));
EXPECT_EQ(OK, requests_[5]->result());
EXPECT_TRUE(requests_[5]->HasOneAddress("192.168.1.102", 80));
}
TEST_F(HostResolverImplTest, ServeFromHosts) {
// Initially, there's DnsConfigService, but no DnsConfig.
MockDnsConfigService* config_service = new MockDnsConfigService();
resolver_.reset(
CreateHostResolverImplWithDnsConfig(
proc_,
scoped_ptr<DnsConfigService>(config_service)));
proc_->AddRuleForAllFamilies("", "0.0.0.0"); // Default to failures.
proc_->SignalMultiple(1u); // For the first request which misses.
DnsConfig config = CreateValidDnsConfig();
set_dns_client(CreateMockDnsClient(config));
Request* req0 = CreateRequest("er_ipv4", 80);
EXPECT_EQ(ERR_IO_PENDING, req0->Resolve());
EXPECT_EQ(ERR_NAME_NOT_RESOLVED, req0->WaitForResult());
IPAddressNumber local_ipv4, local_ipv6;
ASSERT_TRUE(ParseIPLiteralToNumber("127.0.0.1", &local_ipv4));
ASSERT_TRUE(ParseIPLiteralToNumber("::1", &local_ipv6));
DnsHosts hosts;
hosts[DnsHostsKey("er_ipv4", ADDRESS_FAMILY_IPV4)] = local_ipv4;
hosts[DnsHostsKey("er_ipv6", ADDRESS_FAMILY_IPV6)] = local_ipv6;
hosts[DnsHostsKey("er_both", ADDRESS_FAMILY_IPV4)] = local_ipv4;
hosts[DnsHostsKey("er_both", ADDRESS_FAMILY_IPV6)] = local_ipv6;
// Then we introduce valid DnsConfig.
config_service->ChangeConfig(config);
config_service->ChangeHosts(hosts);
Request* req1 = CreateRequest("er_ipv4", 80);
EXPECT_EQ(OK, req1->Resolve());
EXPECT_TRUE(req1->HasOneAddress("127.0.0.1", 80));
Request* req2 = CreateRequest("er_ipv6", 80);
EXPECT_EQ(OK, req2->Resolve());
EXPECT_TRUE(req2->HasOneAddress("::1", 80));
Request* req3 = CreateRequest("er_both", 80);
EXPECT_EQ(OK, req3->Resolve());
EXPECT_TRUE(req3->HasOneAddress("127.0.0.1", 80) ||
req3->HasOneAddress("::1", 80));
// Requests with specified AddressFamily.
Request* req4 = CreateRequest("er_ipv4", 80, MEDIUM, ADDRESS_FAMILY_IPV4);
EXPECT_EQ(OK, req4->Resolve());
EXPECT_TRUE(req4->HasOneAddress("127.0.0.1", 80));
Request* req5 = CreateRequest("er_ipv6", 80, MEDIUM, ADDRESS_FAMILY_IPV6);
EXPECT_EQ(OK, req5->Resolve());
EXPECT_TRUE(req5->HasOneAddress("::1", 80));
// Request with upper case.
Request* req6 = CreateRequest("er_IPV4", 80);
EXPECT_EQ(OK, req6->Resolve());
EXPECT_TRUE(req6->HasOneAddress("127.0.0.1", 80));
}
} // namespace net
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