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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// A fuchsia-specific shell test.
//
// This test is only supposed to be ran on Fuchsia OS, as it exercises
// Fuchsia-specific functionality for which no equivalent exists elsewhere.
#define FML_USED_ON_EMBEDDER
#include <time.h>
#include <unistd.h>
#include <memory>
#include <fuchsia/intl/cpp/fidl.h>
#include <fuchsia/settings/cpp/fidl.h>
#include <lib/sys/cpp/component_context.h>
#include "flutter/fml/dart/dart_converter.h"
#include "flutter/fml/logging.h"
#include "flutter/fml/synchronization/count_down_latch.h"
#include "flutter/runtime/dart_vm.h"
#include "flutter/shell/common/shell_test.h"
namespace flutter {
namespace testing {
using fuchsia::intl::TimeZoneId;
using fuchsia::settings::Intl_Set_Result;
using fuchsia::settings::IntlSettings;
class FuchsiaShellTest : public ShellTest {
protected:
FuchsiaShellTest()
: ctx_(sys::ComponentContext::CreateAndServeOutgoingDirectory()),
intl_() {
ctx_->svc()->Connect(intl_.NewRequest());
}
~FuchsiaShellTest() {
// Restore the time zone that matche that of the test harness. This is
// the default.
const std::string local_timezone = GetLocalTimezone();
SetTimezone(local_timezone);
AssertTimezone(local_timezone, GetSettings());
}
// Gets the international settings from this Fuchsia realm.
IntlSettings GetSettings() {
IntlSettings settings;
zx_status_t status = intl_->Watch2(&settings);
EXPECT_EQ(status, ZX_OK);
return settings;
}
// Sets the timezone of this Fuchsia realm to `timezone_name`.
void SetTimezone(const std::string& timezone_name) {
fuchsia::settings::IntlSettings settings;
settings.set_time_zone_id(TimeZoneId{.id = timezone_name});
Intl_Set_Result result;
zx_status_t status = intl_->Set(std::move(settings), &result);
ASSERT_EQ(status, ZX_OK);
}
std::string GetLocalTimezone() {
const time_t timestamp = time(nullptr);
const struct tm* local_time = localtime(&timestamp);
EXPECT_NE(local_time, nullptr)
<< "Could not get local time: errno=" << errno << ": "
<< strerror(errno);
return std::string(local_time->tm_zone);
}
std::string GetLocalTime() {
const time_t timestamp = time(nullptr);
const struct tm* local_time = localtime(&timestamp);
EXPECT_NE(local_time, nullptr)
<< "Could not get local time: errno=" << errno << ": "
<< strerror(errno);
char buffer[sizeof("2020-08-26 14")];
const size_t written =
strftime(buffer, sizeof(buffer), "%Y-%m-%d %H", local_time);
EXPECT_LT(0UL, written);
return std::string(buffer);
}
// Checks that the timezone name in the `settings` matches what is `expected`.
void AssertTimezone(const std::string& expected,
const IntlSettings& settings) {
ASSERT_EQ(expected, settings.time_zone_id().id);
}
std::unique_ptr<sys::ComponentContext> ctx_;
fuchsia::settings::IntlSyncPtr intl_;
fuchsia::settings::IntlSettings save_settings_;
};
static bool ValidateShell(Shell* shell) {
if (!shell) {
return false;
}
if (!shell->IsSetup()) {
return false;
}
ShellTest::PlatformViewNotifyCreated(shell);
{
fml::AutoResetWaitableEvent latch;
fml::TaskRunner::RunNowOrPostTask(
shell->GetTaskRunners().GetPlatformTaskRunner(), [shell, &latch]() {
shell->GetPlatformView()->NotifyDestroyed();
latch.Signal();
});
latch.Wait();
}
return true;
}
// Runs the function `f` in lock-step with a Dart isolate until the function
// returns `true`, or until a certain fixed number of retries is exhausted.
// Events `tick` and `tock` are used to synchronize the lock-stepping. The
// event 'tick' is a signal to the dart isolate to advance a single iteration
// step. 'tock' is used by the dart isolate to signal that it has completed
// its step.
static void RunCoroutineWithRetry(int retries,
fml::AutoResetWaitableEvent* tick,
fml::AutoResetWaitableEvent* tock,
std::function<bool()> f) {
for (; retries > 0; retries--) {
// Do a single coroutine step.
tick->Signal();
tock->Wait();
if (f()) {
break;
}
FML_LOG(INFO) << "Retries left: " << retries;
sleep(1);
}
}
// Verifies that changing the Fuchsia settings timezone through the FIDL
// settings interface results in a change of the reported local time in the
// isolate.
//
// The test is as follows:
//
// - Set an initial timezone, then get a timestamp from the isolate rounded down
// to the nearest hour. The assumption is as long as this test doesn't run
// very near the whole hour, which should be very unlikely, the nearest hour
// will vary depending on the time zone.
// - Set a different timezone. Get a timestamp from the isolate again and
// confirm that this time around the timestamps are different.
// - Set the initial timezone again, and get the timestamp. This time, the
// timestamp rounded down to whole hour should match the timestamp we got
// in the initial step.
TEST_F(FuchsiaShellTest, LocaltimesVaryOnTimezoneChanges) {
// See fixtures/shell_test.dart, the callback NotifyLocalTime is declared
// there.
fml::AutoResetWaitableEvent latch;
std::string dart_isolate_time_str;
AddNativeCallback("NotifyLocalTime", CREATE_NATIVE_ENTRY([&](auto args) {
dart_isolate_time_str =
tonic::DartConverter<std::string>::FromDart(
Dart_GetNativeArgument(args, 0));
latch.Signal();
}));
// As long as this is set, the isolate will keep rerunning its only task.
bool continue_fixture = true;
fml::AutoResetWaitableEvent fixture_latch;
AddNativeCallback("WaitFixture", CREATE_NATIVE_ENTRY([&](auto args) {
// Wait for the test fixture to advance.
fixture_latch.Wait();
tonic::DartConverter<bool>::SetReturnValue(
args, continue_fixture);
}));
auto settings = CreateSettingsForFixture();
auto configuration = RunConfiguration::InferFromSettings(settings);
configuration.SetEntrypoint("timezonesChange");
std::unique_ptr<Shell> shell = CreateShell(settings);
ASSERT_NE(shell.get(), nullptr);
ASSERT_TRUE(ValidateShell(shell.get()));
RunEngine(shell.get(), std::move(configuration));
latch.Wait(); // After this point, the fixture is at waitFixture().
// Start with the local timezone, ensure that the isolate and the test
// fixture are the same.
SetTimezone(GetLocalTimezone());
AssertTimezone(GetLocalTimezone(), GetSettings());
std::string expected = GetLocalTime();
std::string actual = "undefined";
RunCoroutineWithRetry(10, &fixture_latch, &latch, [&]() {
actual = dart_isolate_time_str;
FML_LOG(INFO) << "reference: " << expected << ", actual: " << actual;
return expected == actual;
});
ASSERT_EQ(expected, actual)
<< "The Dart isolate was expected to show the same time as the test "
<< "fixture eventually, but that didn't happen after multiple retries.";
// Set a new timezone, which is hopefully different from the local one.
SetTimezone("America/New_York");
AssertTimezone("America/New_York", GetSettings());
RunCoroutineWithRetry(10, &fixture_latch, &latch, [&]() {
actual = dart_isolate_time_str;
FML_LOG(INFO) << "reference: " << expected << ", actual: " << actual;
return expected != actual;
});
ASSERT_NE(expected, actual)
<< "The Dart isolate was expected to show a time different from the test "
<< "fixture eventually, but that didn't happen after multiple retries.";
// Set a new isolate timezone, and check that the reported time is eventually
// different from what it used to be prior to the change.
SetTimezone("Europe/Amsterdam");
AssertTimezone("Europe/Amsterdam", GetSettings());
RunCoroutineWithRetry(10, &fixture_latch, &latch, [&]() {
actual = dart_isolate_time_str;
FML_LOG(INFO) << "reference: " << expected << ", actual: " << actual;
return expected != actual;
});
ASSERT_NE(expected, actual)
<< "The Dart isolate was expected to show a time different from the "
<< "prior timezone eventually, but that didn't happen after multiple "
<< "retries.";
// Let's try to bring the timezone back to the old one.
expected = actual;
SetTimezone("America/New_York");
AssertTimezone("America/New_York", GetSettings());
RunCoroutineWithRetry(10, &fixture_latch, &latch, [&]() {
actual = dart_isolate_time_str;
FML_LOG(INFO) << "reference: " << expected << ", actual: " << actual;
return expected != actual;
});
ASSERT_NE(expected, actual)
<< "The Dart isolate was expected to show a time different from the "
<< "prior timezone eventually, but that didn't happen after multiple "
<< "retries.";
// Tell the isolate to exit its loop.
ASSERT_FALSE(fixture_latch.IsSignaledForTest());
continue_fixture = false;
fixture_latch.Signal();
DestroyShell(std::move(shell));
}
} // namespace testing
} // namespace flutter