p2p_manager_unittest.cc - android_system_update_engine - Gitiles

 //
 // Copyright (C) 2012 The Android Open Source Project
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //

 #include "update_engine/p2p_manager.h"

 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/xattr.h>
 #include <unistd.h>

 #include <memory>
 #include <string>
 #include <vector>

 #include <base/bind.h>
 #include <base/callback.h>
 #include <base/files/file_util.h>
 #include <base/message_loop/message_loop.h>
 #include <base/strings/stringprintf.h>
 #include <brillo/asynchronous_signal_handler.h>
 #include <brillo/message_loops/base_message_loop.h>
 #include <brillo/message_loops/message_loop.h>
 #include <brillo/message_loops/message_loop_utils.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <policy/libpolicy.h>
 #include <policy/mock_device_policy.h>

 #include "update_engine/common/fake_clock.h"
 #include "update_engine/common/prefs.h"
 #include "update_engine/common/test_utils.h"
 #include "update_engine/common/utils.h"
 #include "update_engine/fake_p2p_manager_configuration.h"
 #include "update_engine/update_manager/fake_update_manager.h"
 #include "update_engine/update_manager/mock_policy.h"

 using base::TimeDelta;
 using brillo::MessageLoop;
 using std::string;
 using std::unique_ptr;
 using std::vector;
 using testing::DoAll;
 using testing::Return;
 using testing::SetArgPointee;
 using testing::_;

 namespace chromeos_update_engine {

 // Test fixture that sets up a testing configuration (with e.g. a
 // temporary p2p dir) for P2PManager and cleans up when the test is
 // done.
 class P2PManagerTest : public testing::Test {
  protected:
   P2PManagerTest() : fake_um_(&fake_clock_) {}
   ~P2PManagerTest() override {}

   // Derived from testing::Test.
   void SetUp() override {
     loop_.SetAsCurrent();
     async_signal_handler_.Init();
     subprocess_.Init(&async_signal_handler_);
     test_conf_ = new FakeP2PManagerConfiguration();

     // Allocate and install a mock policy implementation in the fake Update
     // Manager.  Note that the FakeUpdateManager takes ownership of the policy
     // object.
     mock_policy_ = new chromeos_update_manager::MockPolicy(&fake_clock_);
     fake_um_.set_policy(mock_policy_);

     // Construct the P2P manager under test.
     manager_.reset(P2PManager::Construct(test_conf_, &fake_clock_, &fake_um_,
                                          "cros_au", 3,
                                          TimeDelta::FromDays(5)));
   }

   base::MessageLoopForIO base_loop_;
   brillo::BaseMessageLoop loop_{&base_loop_};
   brillo::AsynchronousSignalHandler async_signal_handler_;
   Subprocess subprocess_;

   // The P2PManager::Configuration instance used for testing.
   FakeP2PManagerConfiguration *test_conf_;

   FakeClock fake_clock_;
   chromeos_update_manager::MockPolicy *mock_policy_ = nullptr;
   chromeos_update_manager::FakeUpdateManager fake_um_;

   unique_ptr<P2PManager> manager_;
 };


 // Check that IsP2PEnabled() polls the policy correctly, with the value not
 // changing between calls.
 TEST_F(P2PManagerTest, P2PEnabledInitAndNotChanged) {
   EXPECT_CALL(*mock_policy_, P2PEnabled(_, _, _, _));
   EXPECT_CALL(*mock_policy_, P2PEnabledChanged(_, _, _, _, false));

   EXPECT_FALSE(manager_->IsP2PEnabled());
   brillo::MessageLoopRunMaxIterations(MessageLoop::current(), 100);
   EXPECT_FALSE(manager_->IsP2PEnabled());
 }

 // Check that IsP2PEnabled() polls the policy correctly, with the value changing
 // between calls.
 TEST_F(P2PManagerTest, P2PEnabledInitAndChanged) {
   EXPECT_CALL(*mock_policy_, P2PEnabled(_, _, _, _))
       .WillOnce(DoAll(
               SetArgPointee<3>(true),
               Return(chromeos_update_manager::EvalStatus::kSucceeded)));
   EXPECT_CALL(*mock_policy_, P2PEnabledChanged(_, _, _, _, true));
   EXPECT_CALL(*mock_policy_, P2PEnabledChanged(_, _, _, _, false));

   EXPECT_TRUE(manager_->IsP2PEnabled());
   brillo::MessageLoopRunMaxIterations(MessageLoop::current(), 100);
   EXPECT_FALSE(manager_->IsP2PEnabled());
 }

 // Check that we keep the $N newest files with the .$EXT.p2p extension.
 TEST_F(P2PManagerTest, HousekeepingCountLimit) {
   // Specifically pass 0 for |max_file_age| to allow files of any age. Note that
   // we need to reallocate the test_conf_ member, whose currently aliased object
   // will be freed.
   test_conf_ = new FakeP2PManagerConfiguration();
   manager_.reset(P2PManager::Construct(
       test_conf_, &fake_clock_, &fake_um_, "cros_au", 3,
       TimeDelta() /* max_file_age */));
   EXPECT_EQ(manager_->CountSharedFiles(), 0);

   base::Time start_time = base::Time::FromDoubleT(1246996800.);
   // Generate files with different timestamps matching our pattern and generate
   // other files not matching the pattern.
   for (int n = 0; n < 5; n++) {
     base::FilePath path = test_conf_->GetP2PDir().Append(base::StringPrintf(
         "file_%d.cros_au.p2p", n));
     base::Time file_time = start_time + TimeDelta::FromMinutes(n);
     EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
     EXPECT_TRUE(base::TouchFile(path, file_time, file_time));

     path = test_conf_->GetP2PDir().Append(base::StringPrintf(
         "file_%d.OTHER.p2p", n));
     EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
     EXPECT_TRUE(base::TouchFile(path, file_time, file_time));
   }
   // CountSharedFiles() only counts 'cros_au' files.
   EXPECT_EQ(manager_->CountSharedFiles(), 5);

   EXPECT_TRUE(manager_->PerformHousekeeping());

   // At this point - after HouseKeeping - we should only have
   // eight files left.
   for (int n = 0; n < 5; n++) {
     string file_name;
     bool expect;

     expect = (n >= 2);
     file_name = base::StringPrintf(
         "%s/file_%d.cros_au.p2p",
          test_conf_->GetP2PDir().value().c_str(), n);
     EXPECT_EQ(expect, utils::FileExists(file_name.c_str()));

     file_name = base::StringPrintf(
         "%s/file_%d.OTHER.p2p",
         test_conf_->GetP2PDir().value().c_str(), n);
     EXPECT_TRUE(utils::FileExists(file_name.c_str()));
   }
   // CountSharedFiles() only counts 'cros_au' files.
   EXPECT_EQ(manager_->CountSharedFiles(), 3);
 }

 // Check that we keep files with the .$EXT.p2p extension not older
 // than some specificed age (5 days, in this test).
 TEST_F(P2PManagerTest, HousekeepingAgeLimit) {
   // We set the cutoff time to be 1 billion seconds (01:46:40 UTC on 9
   // September 2001 - arbitrary number, but constant to avoid test
   // flakiness) since the epoch and then we put two files before that
   // date and three files after.
   base::Time cutoff_time = base::Time::FromTimeT(1000000000);
   TimeDelta age_limit = TimeDelta::FromDays(5);

   // Set the clock just so files with a timestamp before |cutoff_time|
   // will be deleted at housekeeping.
   fake_clock_.SetWallclockTime(cutoff_time + age_limit);

   // Specifically pass 0 for |num_files_to_keep| to allow any number of files.
   // Note that we need to reallocate the test_conf_ member, whose currently
   // aliased object will be freed.
   test_conf_ = new FakeP2PManagerConfiguration();
   manager_.reset(P2PManager::Construct(
       test_conf_, &fake_clock_, &fake_um_, "cros_au",
       0 /* num_files_to_keep */, age_limit));
   EXPECT_EQ(manager_->CountSharedFiles(), 0);

   // Generate files with different timestamps matching our pattern and generate
   // other files not matching the pattern.
   for (int n = 0; n < 5; n++) {
     base::FilePath path = test_conf_->GetP2PDir().Append(base::StringPrintf(
         "file_%d.cros_au.p2p", n));

     // With five files and aiming for two of them to be before
     // |cutoff_time|, we distribute it like this:
     //
     //  -------- 0 -------- 1 -------- 2 -------- 3 -------- 4 --------
     //                            |
     //                       cutoff_time
     //
     base::Time file_date = cutoff_time + (n - 2) * TimeDelta::FromDays(1)
         + TimeDelta::FromHours(12);

     EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
     EXPECT_TRUE(base::TouchFile(path, file_date, file_date));

     path = test_conf_->GetP2PDir().Append(base::StringPrintf(
         "file_%d.OTHER.p2p", n));
     EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
     EXPECT_TRUE(base::TouchFile(path, file_date, file_date));
   }
   // CountSharedFiles() only counts 'cros_au' files.
   EXPECT_EQ(manager_->CountSharedFiles(), 5);

   EXPECT_TRUE(manager_->PerformHousekeeping());

   // At this point - after HouseKeeping - we should only have
   // eight files left.
   for (int n = 0; n < 5; n++) {
     string file_name;
     bool expect;

     expect = (n >= 2);
     file_name = base::StringPrintf(
         "%s/file_%d.cros_au.p2p",
          test_conf_->GetP2PDir().value().c_str(), n);
     EXPECT_EQ(expect, utils::FileExists(file_name.c_str()));

     file_name = base::StringPrintf(
         "%s/file_%d.OTHER.p2p",
         test_conf_->GetP2PDir().value().c_str(), n);
     EXPECT_TRUE(utils::FileExists(file_name.c_str()));
   }
   // CountSharedFiles() only counts 'cros_au' files.
   EXPECT_EQ(manager_->CountSharedFiles(), 3);
 }

 static bool CheckP2PFile(const string& p2p_dir, const string& file_name,
                          ssize_t expected_size, ssize_t expected_size_xattr) {
   string path = p2p_dir + "/" + file_name;
   char ea_value[64] = { 0 };
   ssize_t ea_size;

   off_t p2p_size = utils::FileSize(path);
   if (p2p_size < 0) {
     LOG(ERROR) << "File " << path << " does not exist";
     return false;
   }

   if (expected_size != 0) {
     if (p2p_size != expected_size) {
       LOG(ERROR) << "Expected size " << expected_size
                  << " but size was " << p2p_size;
       return false;
     }
   }

   if (expected_size_xattr == 0) {
     ea_size = getxattr(path.c_str(), "user.cros-p2p-filesize",
                        &ea_value, sizeof ea_value - 1);
     if (ea_size == -1 && errno == ENODATA) {
       // This is valid behavior as we support files without the xattr set.
     } else {
       PLOG(ERROR) << "getxattr() didn't fail with ENODATA as expected, "
                   << "ea_size=" << ea_size << ", errno=" << errno;
       return false;
     }
   } else {
     ea_size = getxattr(path.c_str(), "user.cros-p2p-filesize",
                        &ea_value, sizeof ea_value - 1);
     if (ea_size < 0) {
       LOG(ERROR) << "Error getting xattr attribute";
       return false;
     }
     char* endp = nullptr;
     long long int val = strtoll(ea_value, &endp, 0);  // NOLINT(runtime/int)
     if (endp == nullptr || *endp != '\0') {
       LOG(ERROR) << "Error parsing xattr '" << ea_value
                  << "' as an integer";
       return false;
     }
     if (val != expected_size_xattr) {
       LOG(ERROR) << "Expected xattr size " << expected_size_xattr
                  << " but size was " << val;
       return false;
     }
   }

   return true;
 }

 static bool CreateP2PFile(string p2p_dir, string file_name,
                           size_t size, size_t size_xattr) {
   string path = p2p_dir + "/" + file_name;

   int fd = open(path.c_str(), O_CREAT|O_RDWR, 0644);
   if (fd == -1) {
     PLOG(ERROR) << "Error creating file with path " << path;
     return false;
   }
   if (ftruncate(fd, size) != 0) {
     PLOG(ERROR) << "Error truncating " << path << " to size " << size;
     close(fd);
     return false;
   }

   if (size_xattr != 0) {
     string decimal_size = std::to_string(size_xattr);
     if (fsetxattr(fd, "user.cros-p2p-filesize",
                   decimal_size.c_str(), decimal_size.size(), 0) != 0) {
       PLOG(ERROR) << "Error setting xattr on " << path;
       close(fd);
       return false;
     }
   }

   close(fd);
   return true;
 }

 // Check that sharing a *new* file works.
 TEST_F(P2PManagerTest, ShareFile) {
   if (!test_utils::IsXAttrSupported(base::FilePath("/tmp"))) {
     LOG(WARNING) << "Skipping test because /tmp does not support xattr. "
                  << "Please update your system to support this feature.";
     return;
   }
   const int kP2PTestFileSize = 1000 * 1000;  // 1 MB

   EXPECT_TRUE(manager_->FileShare("foo", kP2PTestFileSize));
   EXPECT_EQ(manager_->FileGetPath("foo"),
             test_conf_->GetP2PDir().Append("foo.cros_au.p2p.tmp"));
   EXPECT_TRUE(CheckP2PFile(test_conf_->GetP2PDir().value(),
                            "foo.cros_au.p2p.tmp", 0, kP2PTestFileSize));

   // Sharing it again - with the same expected size - should return true
   EXPECT_TRUE(manager_->FileShare("foo", kP2PTestFileSize));

   // ... but if we use the wrong size, it should fail
   EXPECT_FALSE(manager_->FileShare("foo", kP2PTestFileSize + 1));
 }

 // Check that making a shared file visible, does what is expected.
 TEST_F(P2PManagerTest, MakeFileVisible) {
   if (!test_utils::IsXAttrSupported(base::FilePath("/tmp"))) {
     LOG(WARNING) << "Skipping test because /tmp does not support xattr. "
                  << "Please update your system to support this feature.";
     return;
   }
   const int kP2PTestFileSize = 1000 * 1000;  // 1 MB

   // First, check that it's not visible.
   manager_->FileShare("foo", kP2PTestFileSize);
   EXPECT_EQ(manager_->FileGetPath("foo"),
             test_conf_->GetP2PDir().Append("foo.cros_au.p2p.tmp"));
   EXPECT_TRUE(CheckP2PFile(test_conf_->GetP2PDir().value(),
                            "foo.cros_au.p2p.tmp", 0, kP2PTestFileSize));
   // Make the file visible and check that it changed its name. Do it
   // twice to check that FileMakeVisible() is idempotent.
   for (int n = 0; n < 2; n++) {
     manager_->FileMakeVisible("foo");
     EXPECT_EQ(manager_->FileGetPath("foo"),
               test_conf_->GetP2PDir().Append("foo.cros_au.p2p"));
     EXPECT_TRUE(CheckP2PFile(test_conf_->GetP2PDir().value(),
                              "foo.cros_au.p2p", 0, kP2PTestFileSize));
   }
 }

 // Check that we return the right values for existing files in P2P_DIR.
 TEST_F(P2PManagerTest, ExistingFiles) {
   if (!test_utils::IsXAttrSupported(base::FilePath("/tmp"))) {
     LOG(WARNING) << "Skipping test because /tmp does not support xattr. "
                  << "Please update your system to support this feature.";
     return;
   }

   bool visible;

   // Check that errors are returned if the file does not exist
   EXPECT_EQ(manager_->FileGetPath("foo"), base::FilePath());
   EXPECT_EQ(manager_->FileGetSize("foo"), -1);
   EXPECT_EQ(manager_->FileGetExpectedSize("foo"), -1);
   EXPECT_FALSE(manager_->FileGetVisible("foo", nullptr));
   // ... then create the file ...
   EXPECT_TRUE(CreateP2PFile(test_conf_->GetP2PDir().value(),
                             "foo.cros_au.p2p", 42, 43));
   // ... and then check that the expected values are returned
   EXPECT_EQ(manager_->FileGetPath("foo"),
             test_conf_->GetP2PDir().Append("foo.cros_au.p2p"));
   EXPECT_EQ(manager_->FileGetSize("foo"), 42);
   EXPECT_EQ(manager_->FileGetExpectedSize("foo"), 43);
   EXPECT_TRUE(manager_->FileGetVisible("foo", &visible));
   EXPECT_TRUE(visible);

   // One more time, this time with a .tmp variant. First ensure it errors out..
   EXPECT_EQ(manager_->FileGetPath("bar"), base::FilePath());
   EXPECT_EQ(manager_->FileGetSize("bar"), -1);
   EXPECT_EQ(manager_->FileGetExpectedSize("bar"), -1);
   EXPECT_FALSE(manager_->FileGetVisible("bar", nullptr));
   // ... then create the file ...
   EXPECT_TRUE(CreateP2PFile(test_conf_->GetP2PDir().value(),
                             "bar.cros_au.p2p.tmp", 44, 45));
   // ... and then check that the expected values are returned
   EXPECT_EQ(manager_->FileGetPath("bar"),
             test_conf_->GetP2PDir().Append("bar.cros_au.p2p.tmp"));
   EXPECT_EQ(manager_->FileGetSize("bar"), 44);
   EXPECT_EQ(manager_->FileGetExpectedSize("bar"), 45);
   EXPECT_TRUE(manager_->FileGetVisible("bar", &visible));
   EXPECT_FALSE(visible);
 }

 // This is a little bit ugly but short of mocking a 'p2p' service this
 // will have to do. E.g. we essentially simulate the various
 // behaviours of initctl(8) that we rely on.
 TEST_F(P2PManagerTest, StartP2P) {
   // Check that we can start the service
   test_conf_->SetInitctlStartCommand({"true"});
   EXPECT_TRUE(manager_->EnsureP2PRunning());
   test_conf_->SetInitctlStartCommand({"false"});
   EXPECT_FALSE(manager_->EnsureP2PRunning());
   test_conf_->SetInitctlStartCommand({
       "sh", "-c", "echo \"initctl: Job is already running: p2p\" >&2; false"});
   EXPECT_TRUE(manager_->EnsureP2PRunning());
   test_conf_->SetInitctlStartCommand({
       "sh", "-c", "echo something else >&2; false"});
   EXPECT_FALSE(manager_->EnsureP2PRunning());
 }

 // Same comment as for StartP2P
 TEST_F(P2PManagerTest, StopP2P) {
   // Check that we can start the service
   test_conf_->SetInitctlStopCommand({"true"});
   EXPECT_TRUE(manager_->EnsureP2PNotRunning());
   test_conf_->SetInitctlStopCommand({"false"});
   EXPECT_FALSE(manager_->EnsureP2PNotRunning());
   test_conf_->SetInitctlStopCommand({
       "sh", "-c", "echo \"initctl: Unknown instance \" >&2; false"});
   EXPECT_TRUE(manager_->EnsureP2PNotRunning());
   test_conf_->SetInitctlStopCommand({
       "sh", "-c", "echo something else >&2; false"});
   EXPECT_FALSE(manager_->EnsureP2PNotRunning());
 }

 static void ExpectUrl(const string& expected_url,
                       const string& url) {
   EXPECT_EQ(url, expected_url);
   MessageLoop::current()->BreakLoop();
 }

 // Like StartP2P, we're mocking the different results that p2p-client
 // can return. It's not pretty but it works.
 TEST_F(P2PManagerTest, LookupURL) {
   // Emulate p2p-client returning valid URL with "fooX", 42 and "cros_au"
   // being propagated in the right places.
   test_conf_->SetP2PClientCommand({
       "echo", "http://1.2.3.4/{file_id}_{minsize}"});
   manager_->LookupUrlForFile("fooX", 42, TimeDelta(),
                              base::Bind(ExpectUrl,
                                         "http://1.2.3.4/fooX.cros_au_42"));
   loop_.Run();

   // Emulate p2p-client returning invalid URL.
   test_conf_->SetP2PClientCommand({"echo", "not_a_valid_url"});
   manager_->LookupUrlForFile("foobar", 42, TimeDelta(),
                              base::Bind(ExpectUrl, ""));
   loop_.Run();

   // Emulate p2p-client conveying failure.
   test_conf_->SetP2PClientCommand({"false"});
   manager_->LookupUrlForFile("foobar", 42, TimeDelta(),
                              base::Bind(ExpectUrl, ""));
   loop_.Run();

   // Emulate p2p-client not existing.
   test_conf_->SetP2PClientCommand({"/path/to/non/existent/helper/program"});
   manager_->LookupUrlForFile("foobar", 42,
                              TimeDelta(),
                              base::Bind(ExpectUrl, ""));
   loop_.Run();

   // Emulate p2p-client crashing.
   test_conf_->SetP2PClientCommand({"sh", "-c", "kill -SEGV $$"});
   manager_->LookupUrlForFile("foobar", 42, TimeDelta(),
                              base::Bind(ExpectUrl, ""));
   loop_.Run();

   // Emulate p2p-client exceeding its timeout.
   test_conf_->SetP2PClientCommand({
       "sh", "-c",
       // The 'sleep' launched below could be left behind as an orphaned
       // process when the 'sh' process is terminated by SIGTERM. As a
       // remedy, trap SIGTERM and kill the 'sleep' process, which requires
       // launching 'sleep' in background and then waiting for it.
       "cleanup() { kill \"${sleep_pid}\"; exit 0; }; "
       "trap cleanup TERM; "
       "sleep 5 & "
       "sleep_pid=$!; "
       "echo http://1.2.3.4/; "
       "wait"
   });
   manager_->LookupUrlForFile("foobar", 42, TimeDelta::FromMilliseconds(500),
                              base::Bind(ExpectUrl, ""));
   loop_.Run();
 }

 }  // namespace chromeos_update_engine
	//
	// Copyright (C) 2012 The Android Open Source Project
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.
	//

	#include "update_engine/p2p_manager.h"

	#include <dirent.h>
	#include <fcntl.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/xattr.h>
	#include <unistd.h>

	#include <memory>
	#include <string>
	#include <vector>

	#include <base/bind.h>
	#include <base/callback.h>
	#include <base/files/file_util.h>
	#include <base/message_loop/message_loop.h>
	#include <base/strings/stringprintf.h>
	#include <brillo/asynchronous_signal_handler.h>
	#include <brillo/message_loops/base_message_loop.h>
	#include <brillo/message_loops/message_loop.h>
	#include <brillo/message_loops/message_loop_utils.h>
	#include <gmock/gmock.h>
	#include <gtest/gtest.h>
	#include <policy/libpolicy.h>
	#include <policy/mock_device_policy.h>

	#include "update_engine/common/fake_clock.h"
	#include "update_engine/common/prefs.h"
	#include "update_engine/common/test_utils.h"
	#include "update_engine/common/utils.h"
	#include "update_engine/fake_p2p_manager_configuration.h"
	#include "update_engine/update_manager/fake_update_manager.h"
	#include "update_engine/update_manager/mock_policy.h"

	using base::TimeDelta;
	using brillo::MessageLoop;
	using std::string;
	using std::unique_ptr;
	using std::vector;
	using testing::DoAll;
	using testing::Return;
	using testing::SetArgPointee;
	using testing::_;

	namespace chromeos_update_engine {

	// Test fixture that sets up a testing configuration (with e.g. a
	// temporary p2p dir) for P2PManager and cleans up when the test is
	// done.
	class P2PManagerTest : public testing::Test {
	protected:
	P2PManagerTest() : fake_um_(&fake_clock_) {}
	~P2PManagerTest() override {}

	// Derived from testing::Test.
	void SetUp() override {
	loop_.SetAsCurrent();
	async_signal_handler_.Init();
	subprocess_.Init(&async_signal_handler_);
	test_conf_ = new FakeP2PManagerConfiguration();

	// Allocate and install a mock policy implementation in the fake Update
	// Manager. Note that the FakeUpdateManager takes ownership of the policy
	// object.
	mock_policy_ = new chromeos_update_manager::MockPolicy(&fake_clock_);
	fake_um_.set_policy(mock_policy_);

	// Construct the P2P manager under test.
	manager_.reset(P2PManager::Construct(test_conf_, &fake_clock_, &fake_um_,
	"cros_au", 3,
	TimeDelta::FromDays(5)));
	}

	base::MessageLoopForIO base_loop_;
	brillo::BaseMessageLoop loop_{&base_loop_};
	brillo::AsynchronousSignalHandler async_signal_handler_;
	Subprocess subprocess_;

	// The P2PManager::Configuration instance used for testing.
	FakeP2PManagerConfiguration *test_conf_;

	FakeClock fake_clock_;
	chromeos_update_manager::MockPolicy *mock_policy_ = nullptr;
	chromeos_update_manager::FakeUpdateManager fake_um_;

	unique_ptr<P2PManager> manager_;
	};


	// Check that IsP2PEnabled() polls the policy correctly, with the value not
	// changing between calls.
	TEST_F(P2PManagerTest, P2PEnabledInitAndNotChanged) {
	EXPECT_CALL(*mock_policy_, P2PEnabled(_, _, _, _));
	EXPECT_CALL(*mock_policy_, P2PEnabledChanged(_, _, _, _, false));

	EXPECT_FALSE(manager_->IsP2PEnabled());
	brillo::MessageLoopRunMaxIterations(MessageLoop::current(), 100);
	EXPECT_FALSE(manager_->IsP2PEnabled());
	}

	// Check that IsP2PEnabled() polls the policy correctly, with the value changing
	// between calls.
	TEST_F(P2PManagerTest, P2PEnabledInitAndChanged) {
	EXPECT_CALL(*mock_policy_, P2PEnabled(_, _, _, _))
	.WillOnce(DoAll(
	SetArgPointee<3>(true),
	Return(chromeos_update_manager::EvalStatus::kSucceeded)));
	EXPECT_CALL(*mock_policy_, P2PEnabledChanged(_, _, _, _, true));
	EXPECT_CALL(*mock_policy_, P2PEnabledChanged(_, _, _, _, false));

	EXPECT_TRUE(manager_->IsP2PEnabled());
	brillo::MessageLoopRunMaxIterations(MessageLoop::current(), 100);
	EXPECT_FALSE(manager_->IsP2PEnabled());
	}

	// Check that we keep the $N newest files with the .$EXT.p2p extension.
	TEST_F(P2PManagerTest, HousekeepingCountLimit) {
	// Specifically pass 0 for \|max_file_age\| to allow files of any age. Note that
	// we need to reallocate the test_conf_ member, whose currently aliased object
	// will be freed.
	test_conf_ = new FakeP2PManagerConfiguration();
	manager_.reset(P2PManager::Construct(
	test_conf_, &fake_clock_, &fake_um_, "cros_au", 3,
	TimeDelta() /* max_file_age */));
	EXPECT_EQ(manager_->CountSharedFiles(), 0);

	base::Time start_time = base::Time::FromDoubleT(1246996800.);
	// Generate files with different timestamps matching our pattern and generate
	// other files not matching the pattern.
	for (int n = 0; n < 5; n++) {
	base::FilePath path = test_conf_->GetP2PDir().Append(base::StringPrintf(
	"file_%d.cros_au.p2p", n));
	base::Time file_time = start_time + TimeDelta::FromMinutes(n);
	EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
	EXPECT_TRUE(base::TouchFile(path, file_time, file_time));

	path = test_conf_->GetP2PDir().Append(base::StringPrintf(
	"file_%d.OTHER.p2p", n));
	EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
	EXPECT_TRUE(base::TouchFile(path, file_time, file_time));
	}
	// CountSharedFiles() only counts 'cros_au' files.
	EXPECT_EQ(manager_->CountSharedFiles(), 5);

	EXPECT_TRUE(manager_->PerformHousekeeping());

	// At this point - after HouseKeeping - we should only have
	// eight files left.
	for (int n = 0; n < 5; n++) {
	string file_name;
	bool expect;

	expect = (n >= 2);
	file_name = base::StringPrintf(
	"%s/file_%d.cros_au.p2p",
	test_conf_->GetP2PDir().value().c_str(), n);
	EXPECT_EQ(expect, utils::FileExists(file_name.c_str()));

	file_name = base::StringPrintf(
	"%s/file_%d.OTHER.p2p",
	test_conf_->GetP2PDir().value().c_str(), n);
	EXPECT_TRUE(utils::FileExists(file_name.c_str()));
	}
	// CountSharedFiles() only counts 'cros_au' files.
	EXPECT_EQ(manager_->CountSharedFiles(), 3);
	}

	// Check that we keep files with the .$EXT.p2p extension not older
	// than some specificed age (5 days, in this test).
	TEST_F(P2PManagerTest, HousekeepingAgeLimit) {
	// We set the cutoff time to be 1 billion seconds (01:46:40 UTC on 9
	// September 2001 - arbitrary number, but constant to avoid test
	// flakiness) since the epoch and then we put two files before that
	// date and three files after.
	base::Time cutoff_time = base::Time::FromTimeT(1000000000);
	TimeDelta age_limit = TimeDelta::FromDays(5);

	// Set the clock just so files with a timestamp before \|cutoff_time\|
	// will be deleted at housekeeping.
	fake_clock_.SetWallclockTime(cutoff_time + age_limit);

	// Specifically pass 0 for \|num_files_to_keep\| to allow any number of files.
	// Note that we need to reallocate the test_conf_ member, whose currently
	// aliased object will be freed.
	test_conf_ = new FakeP2PManagerConfiguration();
	manager_.reset(P2PManager::Construct(
	test_conf_, &fake_clock_, &fake_um_, "cros_au",
	0 /* num_files_to_keep */, age_limit));
	EXPECT_EQ(manager_->CountSharedFiles(), 0);

	// Generate files with different timestamps matching our pattern and generate
	// other files not matching the pattern.
	for (int n = 0; n < 5; n++) {
	base::FilePath path = test_conf_->GetP2PDir().Append(base::StringPrintf(
	"file_%d.cros_au.p2p", n));

	// With five files and aiming for two of them to be before
	// \|cutoff_time\|, we distribute it like this:
	//
	// -------- 0 -------- 1 -------- 2 -------- 3 -------- 4 --------
	// \|
	// cutoff_time
	//
	base::Time file_date = cutoff_time + (n - 2) * TimeDelta::FromDays(1)
	+ TimeDelta::FromHours(12);

	EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
	EXPECT_TRUE(base::TouchFile(path, file_date, file_date));

	path = test_conf_->GetP2PDir().Append(base::StringPrintf(
	"file_%d.OTHER.p2p", n));
	EXPECT_EQ(0, base::WriteFile(path, nullptr, 0));
	EXPECT_TRUE(base::TouchFile(path, file_date, file_date));
	}
	// CountSharedFiles() only counts 'cros_au' files.
	EXPECT_EQ(manager_->CountSharedFiles(), 5);

	EXPECT_TRUE(manager_->PerformHousekeeping());

	// At this point - after HouseKeeping - we should only have
	// eight files left.
	for (int n = 0; n < 5; n++) {
	string file_name;
	bool expect;

	expect = (n >= 2);
	file_name = base::StringPrintf(
	"%s/file_%d.cros_au.p2p",
	test_conf_->GetP2PDir().value().c_str(), n);
	EXPECT_EQ(expect, utils::FileExists(file_name.c_str()));

	file_name = base::StringPrintf(
	"%s/file_%d.OTHER.p2p",
	test_conf_->GetP2PDir().value().c_str(), n);
	EXPECT_TRUE(utils::FileExists(file_name.c_str()));
	}
	// CountSharedFiles() only counts 'cros_au' files.
	EXPECT_EQ(manager_->CountSharedFiles(), 3);
	}

	static bool CheckP2PFile(const string& p2p_dir, const string& file_name,
	ssize_t expected_size, ssize_t expected_size_xattr) {
	string path = p2p_dir + "/" + file_name;
	char ea_value[64] = { 0 };
	ssize_t ea_size;

	off_t p2p_size = utils::FileSize(path);
	if (p2p_size < 0) {
	LOG(ERROR) << "File " << path << " does not exist";
	return false;
	}

	if (expected_size != 0) {
	if (p2p_size != expected_size) {
	LOG(ERROR) << "Expected size " << expected_size
	<< " but size was " << p2p_size;
	return false;
	}
	}

	if (expected_size_xattr == 0) {
	ea_size = getxattr(path.c_str(), "user.cros-p2p-filesize",
	&ea_value, sizeof ea_value - 1);
	if (ea_size == -1 && errno == ENODATA) {
	// This is valid behavior as we support files without the xattr set.
	} else {
	PLOG(ERROR) << "getxattr() didn't fail with ENODATA as expected, "
	<< "ea_size=" << ea_size << ", errno=" << errno;
	return false;
	}
	} else {
	ea_size = getxattr(path.c_str(), "user.cros-p2p-filesize",
	&ea_value, sizeof ea_value - 1);
	if (ea_size < 0) {
	LOG(ERROR) << "Error getting xattr attribute";
	return false;
	}
	char* endp = nullptr;
	long long int val = strtoll(ea_value, &endp, 0); // NOLINT(runtime/int)
	if (endp == nullptr \|\| *endp != '\0') {
	LOG(ERROR) << "Error parsing xattr '" << ea_value
	<< "' as an integer";
	return false;
	}
	if (val != expected_size_xattr) {
	LOG(ERROR) << "Expected xattr size " << expected_size_xattr
	<< " but size was " << val;
	return false;
	}
	}

	return true;
	}

	static bool CreateP2PFile(string p2p_dir, string file_name,
	size_t size, size_t size_xattr) {
	string path = p2p_dir + "/" + file_name;

	int fd = open(path.c_str(), O_CREAT\|O_RDWR, 0644);
	if (fd == -1) {
	PLOG(ERROR) << "Error creating file with path " << path;
	return false;
	}
	if (ftruncate(fd, size) != 0) {
	PLOG(ERROR) << "Error truncating " << path << " to size " << size;
	close(fd);
	return false;
	}

	if (size_xattr != 0) {
	string decimal_size = std::to_string(size_xattr);
	if (fsetxattr(fd, "user.cros-p2p-filesize",
	decimal_size.c_str(), decimal_size.size(), 0) != 0) {
	PLOG(ERROR) << "Error setting xattr on " << path;
	close(fd);
	return false;
	}
	}

	close(fd);
	return true;
	}

	// Check that sharing a new file works.
	TEST_F(P2PManagerTest, ShareFile) {
	if (!test_utils::IsXAttrSupported(base::FilePath("/tmp"))) {
	LOG(WARNING) << "Skipping test because /tmp does not support xattr. "
	<< "Please update your system to support this feature.";
	return;
	}
	const int kP2PTestFileSize = 1000 * 1000; // 1 MB

	EXPECT_TRUE(manager_->FileShare("foo", kP2PTestFileSize));
	EXPECT_EQ(manager_->FileGetPath("foo"),
	test_conf_->GetP2PDir().Append("foo.cros_au.p2p.tmp"));
	EXPECT_TRUE(CheckP2PFile(test_conf_->GetP2PDir().value(),
	"foo.cros_au.p2p.tmp", 0, kP2PTestFileSize));

	// Sharing it again - with the same expected size - should return true
	EXPECT_TRUE(manager_->FileShare("foo", kP2PTestFileSize));

	// ... but if we use the wrong size, it should fail
	EXPECT_FALSE(manager_->FileShare("foo", kP2PTestFileSize + 1));
	}

	// Check that making a shared file visible, does what is expected.
	TEST_F(P2PManagerTest, MakeFileVisible) {
	if (!test_utils::IsXAttrSupported(base::FilePath("/tmp"))) {
	LOG(WARNING) << "Skipping test because /tmp does not support xattr. "
	<< "Please update your system to support this feature.";
	return;
	}
	const int kP2PTestFileSize = 1000 * 1000; // 1 MB

	// First, check that it's not visible.
	manager_->FileShare("foo", kP2PTestFileSize);
	EXPECT_EQ(manager_->FileGetPath("foo"),
	test_conf_->GetP2PDir().Append("foo.cros_au.p2p.tmp"));
	EXPECT_TRUE(CheckP2PFile(test_conf_->GetP2PDir().value(),
	"foo.cros_au.p2p.tmp", 0, kP2PTestFileSize));
	// Make the file visible and check that it changed its name. Do it
	// twice to check that FileMakeVisible() is idempotent.
	for (int n = 0; n < 2; n++) {
	manager_->FileMakeVisible("foo");
	EXPECT_EQ(manager_->FileGetPath("foo"),
	test_conf_->GetP2PDir().Append("foo.cros_au.p2p"));
	EXPECT_TRUE(CheckP2PFile(test_conf_->GetP2PDir().value(),
	"foo.cros_au.p2p", 0, kP2PTestFileSize));
	}
	}

	// Check that we return the right values for existing files in P2P_DIR.
	TEST_F(P2PManagerTest, ExistingFiles) {
	if (!test_utils::IsXAttrSupported(base::FilePath("/tmp"))) {
	LOG(WARNING) << "Skipping test because /tmp does not support xattr. "
	<< "Please update your system to support this feature.";
	return;
	}

	bool visible;

	// Check that errors are returned if the file does not exist
	EXPECT_EQ(manager_->FileGetPath("foo"), base::FilePath());
	EXPECT_EQ(manager_->FileGetSize("foo"), -1);
	EXPECT_EQ(manager_->FileGetExpectedSize("foo"), -1);
	EXPECT_FALSE(manager_->FileGetVisible("foo", nullptr));
	// ... then create the file ...
	EXPECT_TRUE(CreateP2PFile(test_conf_->GetP2PDir().value(),
	"foo.cros_au.p2p", 42, 43));
	// ... and then check that the expected values are returned
	EXPECT_EQ(manager_->FileGetPath("foo"),
	test_conf_->GetP2PDir().Append("foo.cros_au.p2p"));
	EXPECT_EQ(manager_->FileGetSize("foo"), 42);
	EXPECT_EQ(manager_->FileGetExpectedSize("foo"), 43);
	EXPECT_TRUE(manager_->FileGetVisible("foo", &visible));
	EXPECT_TRUE(visible);

	// One more time, this time with a .tmp variant. First ensure it errors out..
	EXPECT_EQ(manager_->FileGetPath("bar"), base::FilePath());
	EXPECT_EQ(manager_->FileGetSize("bar"), -1);
	EXPECT_EQ(manager_->FileGetExpectedSize("bar"), -1);
	EXPECT_FALSE(manager_->FileGetVisible("bar", nullptr));
	// ... then create the file ...
	EXPECT_TRUE(CreateP2PFile(test_conf_->GetP2PDir().value(),
	"bar.cros_au.p2p.tmp", 44, 45));
	// ... and then check that the expected values are returned
	EXPECT_EQ(manager_->FileGetPath("bar"),
	test_conf_->GetP2PDir().Append("bar.cros_au.p2p.tmp"));
	EXPECT_EQ(manager_->FileGetSize("bar"), 44);
	EXPECT_EQ(manager_->FileGetExpectedSize("bar"), 45);
	EXPECT_TRUE(manager_->FileGetVisible("bar", &visible));
	EXPECT_FALSE(visible);
	}

	// This is a little bit ugly but short of mocking a 'p2p' service this
	// will have to do. E.g. we essentially simulate the various
	// behaviours of initctl(8) that we rely on.
	TEST_F(P2PManagerTest, StartP2P) {
	// Check that we can start the service
	test_conf_->SetInitctlStartCommand({"true"});
	EXPECT_TRUE(manager_->EnsureP2PRunning());
	test_conf_->SetInitctlStartCommand({"false"});
	EXPECT_FALSE(manager_->EnsureP2PRunning());
	test_conf_->SetInitctlStartCommand({
	"sh", "-c", "echo \"initctl: Job is already running: p2p\" >&2; false"});
	EXPECT_TRUE(manager_->EnsureP2PRunning());
	test_conf_->SetInitctlStartCommand({
	"sh", "-c", "echo something else >&2; false"});
	EXPECT_FALSE(manager_->EnsureP2PRunning());
	}

	// Same comment as for StartP2P
	TEST_F(P2PManagerTest, StopP2P) {
	// Check that we can start the service
	test_conf_->SetInitctlStopCommand({"true"});
	EXPECT_TRUE(manager_->EnsureP2PNotRunning());
	test_conf_->SetInitctlStopCommand({"false"});
	EXPECT_FALSE(manager_->EnsureP2PNotRunning());
	test_conf_->SetInitctlStopCommand({
	"sh", "-c", "echo \"initctl: Unknown instance \" >&2; false"});
	EXPECT_TRUE(manager_->EnsureP2PNotRunning());
	test_conf_->SetInitctlStopCommand({
	"sh", "-c", "echo something else >&2; false"});
	EXPECT_FALSE(manager_->EnsureP2PNotRunning());
	}

	static void ExpectUrl(const string& expected_url,
	const string& url) {
	EXPECT_EQ(url, expected_url);
	MessageLoop::current()->BreakLoop();
	}

	// Like StartP2P, we're mocking the different results that p2p-client
	// can return. It's not pretty but it works.
	TEST_F(P2PManagerTest, LookupURL) {
	// Emulate p2p-client returning valid URL with "fooX", 42 and "cros_au"
	// being propagated in the right places.
	test_conf_->SetP2PClientCommand({
	"echo", "http://1.2.3.4/{file_id}_{minsize}"});
	manager_->LookupUrlForFile("fooX", 42, TimeDelta(),
	base::Bind(ExpectUrl,
	"http://1.2.3.4/fooX.cros_au_42"));
	loop_.Run();

	// Emulate p2p-client returning invalid URL.
	test_conf_->SetP2PClientCommand({"echo", "not_a_valid_url"});
	manager_->LookupUrlForFile("foobar", 42, TimeDelta(),
	base::Bind(ExpectUrl, ""));
	loop_.Run();

	// Emulate p2p-client conveying failure.
	test_conf_->SetP2PClientCommand({"false"});
	manager_->LookupUrlForFile("foobar", 42, TimeDelta(),
	base::Bind(ExpectUrl, ""));
	loop_.Run();

	// Emulate p2p-client not existing.
	test_conf_->SetP2PClientCommand({"/path/to/non/existent/helper/program"});
	manager_->LookupUrlForFile("foobar", 42,
	TimeDelta(),
	base::Bind(ExpectUrl, ""));
	loop_.Run();

	// Emulate p2p-client crashing.
	test_conf_->SetP2PClientCommand({"sh", "-c", "kill -SEGV $$"});
	manager_->LookupUrlForFile("foobar", 42, TimeDelta(),
	base::Bind(ExpectUrl, ""));
	loop_.Run();

	// Emulate p2p-client exceeding its timeout.
	test_conf_->SetP2PClientCommand({
	"sh", "-c",
	// The 'sleep' launched below could be left behind as an orphaned
	// process when the 'sh' process is terminated by SIGTERM. As a
	// remedy, trap SIGTERM and kill the 'sleep' process, which requires
	// launching 'sleep' in background and then waiting for it.
	"cleanup() { kill \"${sleep_pid}\"; exit 0; }; "
	"trap cleanup TERM; "
	"sleep 5 & "
	"sleep_pid=$!; "
	"echo http://1.2.3.4/; "
	"wait"
	});
	manager_->LookupUrlForFile("foobar", 42, TimeDelta::FromMilliseconds(500),
	base::Bind(ExpectUrl, ""));
	loop_.Run();
	}

	} // namespace chromeos_update_engine