Perform alarm's period limit check while reading alarm info from StateStore.

extensions/browser/api/alarms/alarms_api_unittest.cc

 // 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.
 
 // This file tests the chrome.alarms extension API.
 
 #include <stddef.h>
 
+#include "base/json/json_reader.h"
 #include "base/test/simple_test_clock.h"
 #include "base/values.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "extensions/browser/api/alarms/alarm_manager.h"
 #include "extensions/browser/api/alarms/alarms_api.h"
+#include "extensions/browser/api/alarms/alarms_api_constants.h"
 #include "extensions/browser/api_test_utils.h"
 #include "extensions/browser/api_unittest.h"
 #include "extensions/common/extension_messages.h"
 #include "ipc/ipc_test_sink.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 typedef extensions::api::alarms::Alarm JsAlarm;
 
 namespace extensions {
@@ skipping 624 matching lines @@
   alarm_manager_->last_poll_time_ = base::Time::FromJsTime(0);
   alarm_manager_->ScheduleNextPoll();
 
   // The next poll time should be 12 seconds from now - the time at which the
   // first alarm should go off.
   EXPECT_DOUBLE_EQ((alarm_manager_->last_poll_time_ +
                     base::TimeDelta::FromSeconds(12)).ToJsTime(),
                    alarm_manager_->next_poll_time_.ToJsTime());
 }
 
+void FrequencyTestGetAlarmsCallback(ExtensionAlarmsTest* test, Alarm* alarm) {
+  ASSERT_TRUE(alarm);
+  EXPECT_EQ("hello", alarm->js_alarm->name);
+  EXPECT_DOUBLE_EQ(10000, alarm->js_alarm->scheduled_time);
+  EXPECT_THAT(alarm->js_alarm->period_in_minutes,
+              testing::Pointee(testing::DoubleEq(0.0001)));
+
+  test->test_clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+  // Now wait for the alarm to fire. Our test delegate will quit the
+  // MessageLoop when that happens.
+  base::MessageLoop::current()->Run();
+}
+
+// Tests that alarms with very small period written to storage are also
+// subjected to minimum polling interval.
+// Regression test for https://crbug.com/618540.
+TEST_F(ExtensionAlarmsSchedulingTest, PollFrequencyFromStoredAlarm) {
+  test_clock_->SetNow(base::Time::FromDoubleT(10));
+
+  // Mimic retrieving an alarm from StateStore.
+  std::string alarm_args =
+      "[{\"name\": \"hello\", \"scheduledTime\": 10000, "
+      "\"periodInMinutes\": 0.0001}]";
+  std::unique_ptr<base::ListValue> value =
+      base::ListValue::From(base::JSONReader::Read(alarm_args));
+  alarm_manager_->ReadFromStorage(extension()->id(), std::move(value));
+
+  // Let the alarm fire once, we will verify the next polling time afterwards.
+  alarm_manager_->GetAlarm(extension()->id(), "hello",
+                           base::Bind(FrequencyTestGetAlarmsCallback, this));
+
+  // The stored alarm's "periodInMinutes" is much smaller than allowed minimum
+  // in this test (alarms_api_constants::kDevDelayMinimum). Make sure
+  // our next poll time corresponds to our allowed minimum and not to the
+  // StateStore specified "periodInMinutes".
+  EXPECT_GE(alarm_manager_->next_poll_time_,
+            // 10s initial clock.
+            base::Time::FromJsTime(10000) +
+                // 10ms in FrequencyTestGetAlarmsCallback.
+                base::TimeDelta::FromMilliseconds(10) +
+                base::TimeDelta::FromSecondsD(
+                    alarms_api_constants::kDevDelayMinimum * 60));
+}
+
 // Test that scheduled alarms go off at set intervals, even if their actual
 // trigger is off.
 TEST_F(ExtensionAlarmsSchedulingTest, RepeatingAlarmsScheduledPredictably) {
   test_clock_->SetNow(base::Time::FromJsTime(0));
   CreateAlarm("[\"a\", {\"periodInMinutes\": 2}]");
 
   alarm_manager_->last_poll_time_ = base::Time::FromJsTime(0);
   alarm_manager_->ScheduleNextPoll();
 
   // We expect the first poll to happen two minutes from the start.
@@ skipping 24 matching lines @@
 
   // The next poll should be the first poll that hasn't happened and is in-line
   // with the original scheduling.
   // Last poll was at 380 seconds; next poll should be at 480 seconds.
   EXPECT_DOUBLE_EQ((alarm_manager_->last_poll_time_ +
                     base::TimeDelta::FromSeconds(100)).ToJsTime(),
                    alarm_manager_->next_poll_time_.ToJsTime());
 }
 
 }  // namespace extensions