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// Copyright 2014 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 "components/gcm_driver/gcm_channel_status_syncer.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
#include "base/rand_util.h"
#include "base/strings/string_number_conversions.h"
#include "components/gcm_driver/gcm_channel_status_request.h"
#include "components/gcm_driver/gcm_driver.h"
#include "components/pref_registry/pref_registry_syncable.h"
namespace gcm {
namespace {
// The GCM channel's enabled state.
const char kGCMChannelStatus[] = "gcm.channel_status";
// The GCM channel's polling interval (in seconds).
const char kGCMChannelPollIntervalSeconds[] = "gcm.poll_interval";
// Last time when checking with the GCM channel status server is done.
const char kGCMChannelLastCheckTime[] = "gcm.check_time";
// A small delay to avoid sending request at browser startup time for first-time
// request.
const int kFirstTimeDelaySeconds = 1 * 60; // 1 minute.
// The fuzzing variation added to the polling delay.
const int kGCMChannelRequestTimeJitterSeconds = 15 * 60; // 15 minues.
// The minimum poll interval that can be overridden to.
const int kMinCustomPollIntervalMinutes = 2;
// Custom poll interval could not be used more than the limit below.
const int kMaxNumberToUseCustomPollInterval = 10;
} // namespace
namespace switches {
// Override the default poll interval for testing purpose.
const char kCustomPollIntervalMinutes[] = "gcm-channel-poll-interval";
} // namepsace switches
// static
void GCMChannelStatusSyncer::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterBooleanPref(kGCMChannelStatus, true);
registry->RegisterIntegerPref(
kGCMChannelPollIntervalSeconds,
GCMChannelStatusRequest::default_poll_interval_seconds());
registry->RegisterInt64Pref(kGCMChannelLastCheckTime, 0);
}
// static
void GCMChannelStatusSyncer::RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterBooleanPref(
kGCMChannelStatus,
true,
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
registry->RegisterIntegerPref(
kGCMChannelPollIntervalSeconds,
GCMChannelStatusRequest::default_poll_interval_seconds(),
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
registry->RegisterInt64Pref(
kGCMChannelLastCheckTime,
0,
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
}
// static
int GCMChannelStatusSyncer::first_time_delay_seconds() {
return kFirstTimeDelaySeconds;
}
GCMChannelStatusSyncer::GCMChannelStatusSyncer(
GCMDriver* driver,
PrefService* prefs,
const std::string& channel_status_request_url,
const std::string& user_agent,
const scoped_refptr<net::URLRequestContextGetter>& request_context)
: driver_(driver),
prefs_(prefs),
channel_status_request_url_(channel_status_request_url),
user_agent_(user_agent),
request_context_(request_context),
started_(false),
gcm_enabled_(true),
poll_interval_seconds_(
GCMChannelStatusRequest::default_poll_interval_seconds()),
custom_poll_interval_use_count_(0),
delay_removed_for_testing_(false),
weak_ptr_factory_(this) {
gcm_enabled_ = prefs_->GetBoolean(kGCMChannelStatus);
poll_interval_seconds_ = prefs_->GetInteger(kGCMChannelPollIntervalSeconds);
if (poll_interval_seconds_ <
GCMChannelStatusRequest::min_poll_interval_seconds()) {
poll_interval_seconds_ =
GCMChannelStatusRequest::min_poll_interval_seconds();
}
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kCustomPollIntervalMinutes)) {
std::string value(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kCustomPollIntervalMinutes));
int minutes = 0;
if (base::StringToInt(value, &minutes)) {
DCHECK_GE(minutes, kMinCustomPollIntervalMinutes);
if (minutes >= kMinCustomPollIntervalMinutes) {
poll_interval_seconds_ = minutes * 60;
custom_poll_interval_use_count_ = kMaxNumberToUseCustomPollInterval;
}
}
}
last_check_time_ = base::Time::FromInternalValue(
prefs_->GetInt64(kGCMChannelLastCheckTime));
}
GCMChannelStatusSyncer::~GCMChannelStatusSyncer() {
}
void GCMChannelStatusSyncer::EnsureStarted() {
// Bail out if the request is already scheduled or started.
if (started_)
return;
started_ = true;
ScheduleRequest();
}
void GCMChannelStatusSyncer::Stop() {
started_ = false;
request_.reset();
weak_ptr_factory_.InvalidateWeakPtrs();
}
void GCMChannelStatusSyncer::OnRequestCompleted(bool update_received,
bool enabled,
int poll_interval_seconds) {
DCHECK(request_);
request_.reset();
// Persist the current time as the last request complete time.
last_check_time_ = base::Time::Now();
prefs_->SetInt64(kGCMChannelLastCheckTime,
last_check_time_.ToInternalValue());
if (update_received) {
if (gcm_enabled_ != enabled) {
gcm_enabled_ = enabled;
prefs_->SetBoolean(kGCMChannelStatus, enabled);
if (gcm_enabled_)
driver_->Enable();
else
driver_->Disable();
}
// Skip updating poll interval if the custom one is still in effect.
if (!custom_poll_interval_use_count_) {
DCHECK_GE(poll_interval_seconds,
GCMChannelStatusRequest::min_poll_interval_seconds());
if (poll_interval_seconds_ != poll_interval_seconds) {
poll_interval_seconds_ = poll_interval_seconds;
prefs_->SetInteger(kGCMChannelPollIntervalSeconds,
poll_interval_seconds_);
}
}
}
// Do not schedule next request if syncer is stopped.
if (started_)
ScheduleRequest();
}
void GCMChannelStatusSyncer::ScheduleRequest() {
current_request_delay_interval_ = GetRequestDelayInterval();
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&GCMChannelStatusSyncer::StartRequest,
weak_ptr_factory_.GetWeakPtr()),
current_request_delay_interval_);
if (custom_poll_interval_use_count_)
custom_poll_interval_use_count_--;
}
void GCMChannelStatusSyncer::StartRequest() {
DCHECK(!request_);
request_.reset(new GCMChannelStatusRequest(
request_context_,
channel_status_request_url_,
user_agent_,
base::Bind(&GCMChannelStatusSyncer::OnRequestCompleted,
weak_ptr_factory_.GetWeakPtr())));
request_->Start();
}
base::TimeDelta GCMChannelStatusSyncer::GetRequestDelayInterval() const {
// No delay during testing.
if (delay_removed_for_testing_)
return base::TimeDelta();
// Make sure that checking with server occurs at polling interval, regardless
// whether the browser restarts.
int64 delay_seconds = poll_interval_seconds_ -
(base::Time::Now() - last_check_time_).InSeconds();
if (delay_seconds < 0)
delay_seconds = 0;
if (last_check_time_.is_null()) {
// For the first-time request, add a small delay to avoid sending request at
// browser startup time.
DCHECK(!delay_seconds);
delay_seconds = kFirstTimeDelaySeconds;
} else {
// Otherwise, add a fuzzing variation to the delay.
// The fuzzing variation is off when the custom interval is used.
if (!custom_poll_interval_use_count_)
delay_seconds += base::RandInt(0, kGCMChannelRequestTimeJitterSeconds);
}
return base::TimeDelta::FromSeconds(delay_seconds);
}
} // namespace gcm
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